less/lib/less/parser/chunker.js

Leaner CSS

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
// Split the input into chunks.
function default_1(input, fail) {
    var len = input.length;
    var level = 0;
    var parenLevel = 0;
    var lastOpening;
    var lastOpeningParen;
    var lastMultiComment;
    var lastMultiCommentEndBrace;
    var chunks = [];
    var emitFrom = 0;
    var chunkerCurrentIndex;
    var currentChunkStartIndex;
    var cc;
    var cc2;
    var matched;
    function emitChunk(force) {
        var len = chunkerCurrentIndex - emitFrom;
        if (((len < 512) && !force) || !len) {
            return;
        }
        chunks.push(input.slice(emitFrom, chunkerCurrentIndex + 1));
        emitFrom = chunkerCurrentIndex + 1;
    }
    for (chunkerCurrentIndex = 0; chunkerCurrentIndex < len; chunkerCurrentIndex++) {
        cc = input.charCodeAt(chunkerCurrentIndex);
        if (((cc >= 97) && (cc <= 122)) || (cc < 34)) {
            // a-z or whitespace
            continue;
        }
        switch (cc) {
            case 40: // (
                parenLevel++;
                lastOpeningParen = chunkerCurrentIndex;
                continue;
            case 41: // )
                if (--parenLevel < 0) {
                    return fail('missing opening `(`', chunkerCurrentIndex);
                }
                continue;
            case 59: // ;
                if (!parenLevel) {
                    emitChunk();
                }
                continue;
            case 123: // {
                level++;
                lastOpening = chunkerCurrentIndex;
                continue;
            case 125: // }
                if (--level < 0) {
                    return fail('missing opening `{`', chunkerCurrentIndex);
                }
                if (!level && !parenLevel) {
                    emitChunk();
                }
                continue;
            case 92: // \
                if (chunkerCurrentIndex < len - 1) {
                    chunkerCurrentIndex++;
                    continue;
                }
                return fail('unescaped `\\`', chunkerCurrentIndex);
            case 34:
            case 39:
            case 96: // ", ' and `
                matched = 0;
                currentChunkStartIndex = chunkerCurrentIndex;
                for (chunkerCurrentIndex = chunkerCurrentIndex + 1; chunkerCurrentIndex < len; chunkerCurrentIndex++) {
                    cc2 = input.charCodeAt(chunkerCurrentIndex);
                    if (cc2 > 96) {
                        continue;
                    }
                    if (cc2 == cc) {
                        matched = 1;
                        break;
                    }
                    if (cc2 == 92) { // \
                        if (chunkerCurrentIndex == len - 1) {
                            return fail('unescaped `\\`', chunkerCurrentIndex);
                        }
                        chunkerCurrentIndex++;
                    }
                }
                if (matched) {
                    continue;
                }
                return fail("unmatched `".concat(String.fromCharCode(cc), "`"), currentChunkStartIndex);
            case 47: // /, check for comment
                if (parenLevel || (chunkerCurrentIndex == len - 1)) {
                    continue;
                }
                cc2 = input.charCodeAt(chunkerCurrentIndex + 1);
                if (cc2 == 47) {
                    // //, find lnfeed
                    for (chunkerCurrentIndex = chunkerCurrentIndex + 2; chunkerCurrentIndex < len; chunkerCurrentIndex++) {
                        cc2 = input.charCodeAt(chunkerCurrentIndex);
                        if ((cc2 <= 13) && ((cc2 == 10) || (cc2 == 13))) {
                            break;
                        }
                    }
                }
                else if (cc2 == 42) {
                    // /*, find */
                    lastMultiComment = currentChunkStartIndex = chunkerCurrentIndex;
                    for (chunkerCurrentIndex = chunkerCurrentIndex + 2; chunkerCurrentIndex < len - 1; chunkerCurrentIndex++) {
                        cc2 = input.charCodeAt(chunkerCurrentIndex);
                        if (cc2 == 125) {
                            lastMultiCommentEndBrace = chunkerCurrentIndex;
                        }
                        if (cc2 != 42) {
                            continue;
                        }
                        if (input.charCodeAt(chunkerCurrentIndex + 1) == 47) {
                            break;
                        }
                    }
                    if (chunkerCurrentIndex == len - 1) {
                        return fail('missing closing `*/`', currentChunkStartIndex);
                    }
                    chunkerCurrentIndex++;
                }
                continue;
            case 42: // *, check for unmatched */
                if ((chunkerCurrentIndex < len - 1) && (input.charCodeAt(chunkerCurrentIndex + 1) == 47)) {
                    return fail('unmatched `/*`', chunkerCurrentIndex);
                }
                continue;
        }
    }
    if (level !== 0) {
        if ((lastMultiComment > lastOpening) && (lastMultiCommentEndBrace > lastMultiComment)) {
            return fail('missing closing `}` or `*/`', lastOpening);
        }
        else {
            return fail('missing closing `}`', lastOpening);
        }
    }
    else if (parenLevel !== 0) {
        return fail('missing closing `)`', lastOpeningParen);
    }
    emitChunk(true);
    return chunks;
}
exports.default = default_1;
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