feat: add molang package

1. upgrade bukkit chat
2. fix config update error

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

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
+	}
+}