JSON.minify/minify.json.js at master · danielyule/JSON.minify · GitHub

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(function(global){
    if (typeof global.JSON == "undefined" || !global.JSON) {
        global.JSON = {};
    }
    var PARSER_STATE = {
        WHITESPACE: 0,
        NON_WHITESPACE: 1,
        SINGLE_SLASH: 2,
        SINGLE_SLASH_AFTER_WHITESPACE: 3,
        MULTI_LINE_COMMENT: 4,
        MULTI_LINE_COMMENT_STAR : 5,
        SINGLE_LINE_COMMENT:6,
        IN_STRING : 7,
        ESCAPE_CHAR_IN_STRING: 8
    }
    global.JSON.minify = function(json) {
        var state = PARSER_STATE.WHITESPACE,
            index,
            length = json.length,
            char,
            copyStart = 0,
            minified = "";

        for(index = 0; index < length; index++) {
            char = json[index];
            switch(state) {
            case PARSER_STATE.WHITESPACE:
                if(char !== ' ' && char !== '\n' && char !== '\r' && char !== '\t') {
                    copyStart = index;
                    if(char === '/') {
                        state = PARSER_STATE.SINGLE_SLASH_AFTER_WHITESPACE;
                    } else if(char === '"'|| char === '\'') {
                        state = PARSER_STATE.IN_STRING;
                    } else {
                        state = PARSER_STATE.NON_WHITESPACE;
                    }
                }
                break;
            case PARSER_STATE.NON_WHITESPACE:
                if(char !== ' ' && char !== '\n' && char !== '\r' && char !== '\t') {
                    if(char === '/') {
                        state = PARSER_STATE.SINGLE_SLASH;
                    } else if(char === '"'|| char === '\'') {
                        state = PARSER_STATE.IN_STRING;
                    } else {
                        state = PARSER_STATE.NON_WHITESPACE;
                    }
                } else {
                    minified += json.substr(copyStart, index - copyStart);
                    state = PARSER_STATE.WHITESPACE;
                }
                break;
            case PARSER_STATE.SINGLE_SLASH:
                if(char === '*') {
                    minified += json.substr(copyStart, index - copyStart - 1);
                    state = PARSER_STATE.MULTI_LINE_COMMENT;
                } else if (char === '/') {
                    minified += json.substr(copyStart, index - copyStart - 1);
                    state = PARSER_STATE.SINGLE_LINE_COMMENT;
                } else if(char === '"'|| char === '\'') {
                    state = PARSER_STATE.IN_STRING;
                } else if(char !== ' ' && char !== '\n' && char !== '\r' && char !== '\t') {
                    state = PARSER_STATE.NON_WHITESPACE;
                } else {
                    minified += json.substr(copyStart, index - copyStart);
                    state = PARSER_STATE.WHITESPACE;
                }
                break;

            case PARSER_STATE.SINGLE_SLASH_AFTER_WHITESPACE:
                if(char === '*') {
                    state = PARSER_STATE.MULTI_LINE_COMMENT;
                } else if (char === '/') {
                    state = PARSER_STATE.SINGLE_LINE_COMMENT;
                } else if(char === '"'|| char === '\'') {
                    state = PARSER_STATE.IN_STRING;
                } else if(char !== ' ' && char !== '\n' && char !== '\r' && char !== '\t') {
                    state = PARSER_STATE.NON_WHITESPACE;
                } else {
                    minified += json.substr(copyStart, index - copyStart);
                    state = PARSER_STATE.WHITESPACE;
                }
                break;

            case PARSER_STATE.MULTI_LINE_COMMENT:
                if(char === '*') {
                    state = PARSER_STATE.MULTI_LINE_COMMENT_STAR;
                }
                break;
            case PARSER_STATE.MULTI_LINE_COMMENT_STAR:
                if(char === '/') {
                    state = PARSER_STATE.WHITESPACE;
                } else {
                    state = PARSER_STATE.MULTI_LINE_COMMENT;
                }
                break;
            case PARSER_STATE.SINGLE_LINE_COMMENT:
                if(char === '\n' || char === '\r') {
                    state = PARSER_STATE.WHITESPACE;
                }
                break;
            case PARSER_STATE.IN_STRING:
                if(char === '"' || char === '\'') {
                    state = PARSER_STATE.NON_WHITESPACE;
                } else if(char === '\\') {
                    state = PARSER_STATE.ESCAPE_CHAR_IN_STRING;
                }
                break;
            case PARSER_STATE.ESCAPE_CHAR_IN_STRING:
                state = PARSER_STATE.IN_STRING;
                break;
            }
        }
        if(state === PARSER_STATE.NON_WHITESPACE) {
            minified += json.substr(copyStart);
        }
        return minified;

    };
})(this);