Method getParser

src/common/style/CartoCSS.js:72–875

* @function CartoCSS.prototype.getParser * @description 获取 CartoCSS 解析器。

(env)

     * @description 获取 CartoCSS 解析器。
     */
    getParser(env) {
        var input,       // LeSS input string
            i,           // current index in `input`
            j,           // current chunk
            temp,        // temporarily holds a chunk's state, for backtracking
            memo,        // temporarily holds `i`, when backtracking
            furthest,    // furthest index the parser has gone to
            chunks,      // chunkified input
            current,     // index of current chunk, in `input`
            parser;

        var that = this;

        // This function is called after all files
        // have been imported through `@import`.
        var finish = function () {//NOSONAR
            //所有文件导入完成之后调用
        };

        function save() {
            temp = chunks[j];
            memo = i;
            current = i;
        }

        function restore() {
            chunks[j] = temp;
            i = memo;
            current = i;
        }

        function sync() {
            if (i > current) {
                chunks[j] = chunks[j].slice(i - current);
                current = i;
            }
        }

        //
        // Parse from a token, regexp or string, and move forward if match
        //
        function _match(tok) {
            var match, length, c, endIndex;

            // Non-terminal
            if (tok instanceof Function) {
                return tok.call(parser.parsers);
                // Terminal
                // Either match a single character in the input,
                // or match a regexp in the current chunk (chunk[j]).
            } else if (typeof(tok) === 'string') {
                match = input.charAt(i) === tok ? tok : null;
                length = 1;
                sync();
            } else {
                sync();

                match = tok.exec(chunks[j]);