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132 lines
3.8 KiB
JavaScript
132 lines
3.8 KiB
JavaScript
6 years ago
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var EscapeStore = require('./escape-store');
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var QuoteScanner = require('../utils/quote-scanner');
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var SPECIAL_COMMENT_PREFIX = '/*!';
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var COMMENT_PREFIX = '/*';
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var COMMENT_SUFFIX = '*/';
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var lineBreak = require('os').EOL;
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function CommentsProcessor(context, keepSpecialComments, keepBreaks, saveWaypoints) {
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this.comments = new EscapeStore('COMMENT');
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this.specialComments = new EscapeStore('COMMENT_SPECIAL');
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this.context = context;
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this.restored = 0;
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this.keepAll = keepSpecialComments == '*';
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this.keepOne = keepSpecialComments == '1' || keepSpecialComments === 1;
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this.keepBreaks = keepBreaks;
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this.saveWaypoints = saveWaypoints;
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}
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function quoteScannerFor(data) {
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var quoteMap = [];
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new QuoteScanner(data).each(function (quotedString, _, startsAt) {
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quoteMap.push([startsAt, startsAt + quotedString.length]);
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});
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return function (position) {
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for (var i = 0, l = quoteMap.length; i < l; i++) {
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if (quoteMap[i][0] < position && quoteMap[i][1] > position)
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return true;
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}
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return false;
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};
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}
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CommentsProcessor.prototype.escape = function (data) {
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var tempData = [];
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var nextStart = 0;
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var nextEnd = 0;
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var cursor = 0;
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var indent = 0;
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var breaksCount;
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var lastBreakAt;
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var newIndent;
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var isQuotedAt = quoteScannerFor(data);
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var saveWaypoints = this.saveWaypoints;
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for (; nextEnd < data.length;) {
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nextStart = data.indexOf(COMMENT_PREFIX, cursor);
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if (nextStart == -1)
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break;
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if (isQuotedAt(nextStart)) {
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tempData.push(data.substring(cursor, nextStart + COMMENT_PREFIX.length));
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cursor = nextStart + COMMENT_PREFIX.length;
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continue;
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}
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nextEnd = data.indexOf(COMMENT_SUFFIX, nextStart + COMMENT_PREFIX.length);
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if (nextEnd == -1) {
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this.context.warnings.push('Broken comment: \'' + data.substring(nextStart) + '\'.');
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nextEnd = data.length - 2;
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}
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tempData.push(data.substring(cursor, nextStart));
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var comment = data.substring(nextStart, nextEnd + COMMENT_SUFFIX.length);
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var isSpecialComment = comment.indexOf(SPECIAL_COMMENT_PREFIX) === 0;
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if (saveWaypoints) {
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breaksCount = comment.split(lineBreak).length - 1;
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lastBreakAt = comment.lastIndexOf(lineBreak);
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newIndent = lastBreakAt > 0 ?
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comment.substring(lastBreakAt + lineBreak.length).length :
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indent + comment.length;
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}
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if (saveWaypoints || isSpecialComment) {
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var metadata = saveWaypoints ? [breaksCount, newIndent] : null;
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var placeholder = isSpecialComment ?
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this.specialComments.store(comment, metadata) :
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this.comments.store(comment, metadata);
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tempData.push(placeholder);
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}
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if (saveWaypoints)
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indent = newIndent + 1;
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cursor = nextEnd + COMMENT_SUFFIX.length;
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}
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return tempData.length > 0 ?
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tempData.join('') + data.substring(cursor, data.length) :
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data;
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};
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function restore(context, data, from, isSpecial) {
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var tempData = [];
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var cursor = 0;
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for (; cursor < data.length;) {
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var nextMatch = from.nextMatch(data, cursor);
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if (nextMatch.start < 0)
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break;
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tempData.push(data.substring(cursor, nextMatch.start));
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var comment = from.restore(nextMatch.match);
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if (isSpecial && (context.keepAll || (context.keepOne && context.restored === 0))) {
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context.restored++;
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tempData.push(comment);
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cursor = nextMatch.end;
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} else {
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cursor = nextMatch.end + (context.keepBreaks && data.substring(nextMatch.end, nextMatch.end + lineBreak.length) == lineBreak ? lineBreak.length : 0);
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}
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}
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return tempData.length > 0 ?
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tempData.join('') + data.substring(cursor, data.length) :
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data;
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}
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CommentsProcessor.prototype.restore = function (data) {
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data = restore(this, data, this.comments, false);
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data = restore(this, data, this.specialComments, true);
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return data;
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};
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module.exports = CommentsProcessor;
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