TabooLib/src/main/src/me/skymc/taboolib/json/JSONWriter.java

package me.skymc.taboolib.json;

import java.io.IOException;
import java.io.Writer;

public class JSONWriter {
	
    private static final int maxdepth = 200;

    private boolean comma;

    protected char mode;

    private final JSONObject stack[];

    private int top;

    protected Writer writer;

    public JSONWriter(Writer w) {
        this.comma = false;
        this.mode = 'i';
        this.stack = new JSONObject[maxdepth];
        this.top = 0;
        this.writer = w;
    }

    private JSONWriter append(String string) throws JSONException {
        if (string == null) {
            throw new JSONException("Null pointer");
        }
        if (this.mode == 'o' || this.mode == 'a') {
            try {
                if (this.comma && this.mode == 'a') {
                    this.writer.write(',');
                }
                this.writer.write(string);
            } catch (IOException e) {
                throw new JSONException(e);
            }
            if (this.mode == 'o') {
                this.mode = 'k';
            }
            this.comma = true;
            return this;
        }
        throw new JSONException("Value out of sequence.");
    }

    public JSONWriter array() throws JSONException {
        if (this.mode == 'i' || this.mode == 'o' || this.mode == 'a') {
            this.push(null);
            this.append("[");
            this.comma = false;
            return this;
        }
        throw new JSONException("Misplaced array.");
    }

    private JSONWriter end(char mode, char c) throws JSONException {
        if (this.mode != mode) {
            throw new JSONException(mode == 'a'
                ? "Misplaced endArray."
                : "Misplaced endObject.");
        }
        this.pop(mode);
        try {
            this.writer.write(c);
        } catch (IOException e) {
            throw new JSONException(e);
        }
        this.comma = true;
        return this;
    }

    public JSONWriter endArray() throws JSONException {
        return this.end('a', ']');
    }

    public JSONWriter endObject() throws JSONException {
        return this.end('k', '}');
    }

    public JSONWriter key(String string) throws JSONException {
        if (string == null) {
            throw new JSONException("Null key.");
        }
        if (this.mode == 'k') {
            try {
                this.stack[this.top - 1].putOnce(string, Boolean.TRUE);
                if (this.comma) {
                    this.writer.write(',');
                }
                this.writer.write(JSONObject.quote(string));
                this.writer.write(':');
                this.comma = false;
                this.mode = 'o';
                return this;
            } catch (IOException e) {
                throw new JSONException(e);
            }
        }
        throw new JSONException("Misplaced key.");
    }

    public JSONWriter object() throws JSONException {
        if (this.mode == 'i') {
            this.mode = 'o';
        }
        if (this.mode == 'o' || this.mode == 'a') {
            this.append("{");
            this.push(new JSONObject());
            this.comma = false;
            return this;
        }
        throw new JSONException("Misplaced object.");

    }

    private void pop(char c) throws JSONException {
        if (this.top <= 0) {
            throw new JSONException("Nesting error.");
        }
        char m = this.stack[this.top - 1] == null ? 'a' : 'k';
        if (m != c) {
            throw new JSONException("Nesting error.");
        }
        this.top -= 1;
        this.mode = this.top == 0
            ? 'd'
            : this.stack[this.top - 1] == null
            ? 'a'
            : 'k';
    }

    private void push(JSONObject jo) throws JSONException {
        if (this.top >= maxdepth) {
            throw new JSONException("Nesting too deep.");
        }
        this.stack[this.top] = jo;
        this.mode = jo == null ? 'a' : 'k';
        this.top += 1;
    }

    public JSONWriter value(boolean b) throws JSONException {
        return this.append(b ? "true" : "false");
    }

    public JSONWriter value(double d) throws JSONException {
        return this.value(new Double(d));
    }

    public JSONWriter value(long l) throws JSONException {
        return this.append(Long.toString(l));
    }

    public JSONWriter value(Object object) throws JSONException {
        return this.append(JSONObject.valueToString(object));
    }
}