json core

 Json 源码

     The Software shall be used for Good, not Evil.

public class JSONTokener {

    private int 	character;
	private boolean eof;
    private int 	index;
    private int 	line;
    private char 	previous;
    private Reader 	reader;
    private boolean usePrevious;


    /**
     * Construct a JSONTokener from a Reader.
     *
     * @param reader     A reader.
     */
    public JSONTokener(Reader reader) {
        this.reader = reader.markSupported() ? 
        		reader : new BufferedReader(reader);
        this.eof = false;
        this.usePrevious = false;
        this.previous = 0;
        this.index = 0;
        this.character = 1;
        this.line = 1;
    }

  

   public Object nextValue() throws JSONException {
        char c = nextClean();
        String string;

        switch (c) {
            case '"':
            case '\'':
                return nextString(c);
            case '{':
                back();
                return new JSONObject(this);
            case '[':
                back();
                return new JSONArray(this);
        }

  public char nextClean() throws JSONException {
        for (;;) {
            char c = next();
            if (c == 0 || c > ' ') {
                return c;
            }
        }
    }

  

  public void back() throws JSONException {
        if (usePrevious || index <= 0) {
            throw new JSONException("Stepping back two steps is not supported");
        }
        this.index -= 1;
        this.character -= 1;
        this.usePrevious = true;
        this.eof = false;
    }

 public String nextString(char quote) throws JSONException {
        char c;
        StringBuffer sb = new StringBuffer();
        for (;;) {
            c = next();
            switch (c) {
            case 0:
            case '\n':
            case '\r':
                throw syntaxError("Unterminated string");
            case '\\':
                c = next();
                switch (c) {
                case 'b':
                    sb.append('\b');
                    break;
                case 't':
                    sb.append('\t');
                    break;
                case 'n':
                    sb.append('\n');
                    break;
                case 'f':
                    sb.append('\f');
                    break;
                case 'r':
                    sb.append('\r');
                    break;
                case 'u':
                    sb.append((char)Integer.parseInt(next(4), 16));
                    break;
                case '"':
                case '\'':
                case '\\':
                case '/':
                	sb.append(c);
                	break;
                default:
                    throw syntaxError("Illegal escape.");
                }
                break;
            default:
                if (c == quote) {
                    return sb.toString();
                }
                sb.append(c);
            }
        }
    }

 public JSONObject(JSONTokener x) throws JSONException {
        this();
        char c;
        String key;

        if (x.nextClean() != '{') {
            throw x.syntaxError("A JSONObject text must begin with '{'");
        }
        for (;;) {
            c = x.nextClean();
            switch (c) {
            case 0:
                throw x.syntaxError("A JSONObject text must end with '}'");
            case '}':
                return;
            default:
                x.back();
                key = x.nextValue().toString();
            }

// The key is followed by ':'. We will also tolerate '=' or '=>'.

            c = x.nextClean();
            if (c == '=') {
                if (x.next() != '>') {
                    x.back();
                }
            } else if (c != ':') {
                throw x.syntaxError("Expected a ':' after a key");
            }
            putOnce(key, x.nextValue());

// Pairs are separated by ','. We will also tolerate ';'.

            switch (x.nextClean()) {
            case ';':
            case ',':
                if (x.nextClean() == '}') {
                    return;
                }
                x.back();
                break;
            case '}':
                return;
            default:
                throw x.syntaxError("Expected a ',' or '}'");
            }
        }
    }

  public JSONObject putOnce(String key, Object value) throws JSONException {
        if (key != null && value != null) {
            if (opt(key) != null) {
                throw new JSONException("Duplicate key \"" + key + "\"");
            }
            put(key, value);
        }
        return this;
    }

   @SuppressWarnings("unchecked")
	public JSONObject put(String key, Object value) throws JSONException {
        if (key == null) {
            throw new JSONException("Null key.");
        }
        if (value != null) {
            testValidity(value);
            this.map.put(key, value);
        } else {
            remove(key);
        }
        return this;
    }

  

public JSONArray(JSONTokener x) throws JSONException {
        this();
        if (x.nextClean() != '[') {
            throw x.syntaxError("A JSONArray text must start with '['");
        }
        if (x.nextClean() != ']') {
	        x.back();
	        for (;;) {
	            if (x.nextClean() == ',') {
	                x.back();
	                this.myArrayList.add(JSONObject.NULL);
	            } else {
	                x.back();
	                this.myArrayList.add(x.nextValue());
	            }
	            switch (x.nextClean()) {
	            case ';':
	            case ',':
	                if (x.nextClean() == ']') {
	                    return;
	                }
	                x.back();
	                break;
	            case ']':
	            	return;
	            default:
	                throw x.syntaxError("Expected a ',' or ']'");
	            }
	        }
        }
    }

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