120 lines
2.9 KiB
JavaScript
120 lines
2.9 KiB
JavaScript
var COMMENT_START_MARK = '/*';
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function QuoteScanner(data) {
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this.data = data;
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}
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var findQuoteEnd = function (data, matched, cursor, oldCursor) {
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var commentEndMark = '*/';
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var escapeMark = '\\';
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var blockEndMark = '}';
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var dataPrefix = data.substring(oldCursor, cursor);
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var commentEndedAt = dataPrefix.lastIndexOf(commentEndMark, cursor);
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var commentStartedAt = findLastCommentStartedAt(dataPrefix, cursor);
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var commentStarted = false;
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if (commentEndedAt >= cursor && commentStartedAt > -1)
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commentStarted = true;
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if (commentStartedAt < cursor && commentStartedAt > commentEndedAt)
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commentStarted = true;
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if (commentStarted) {
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var commentEndsAt = data.indexOf(commentEndMark, cursor);
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if (commentEndsAt > -1)
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return commentEndsAt;
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commentEndsAt = data.indexOf(blockEndMark, cursor);
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return commentEndsAt > -1 ? commentEndsAt - 1 : data.length;
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}
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while (true) {
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if (data[cursor] === undefined)
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break;
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if (data[cursor] == matched && (data[cursor - 1] != escapeMark || data[cursor - 2] == escapeMark))
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break;
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cursor++;
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}
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return cursor;
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};
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function findLastCommentStartedAt(data, cursor) {
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var position = cursor;
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while (position > -1) {
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position = data.lastIndexOf(COMMENT_START_MARK, position);
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if (position > -1 && data[position - 1] != '*') {
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break;
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} else {
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position--;
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}
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}
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return position;
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}
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function findNext(data, mark, startAt) {
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var escapeMark = '\\';
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var candidate = startAt;
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while (true) {
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candidate = data.indexOf(mark, candidate + 1);
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if (candidate == -1)
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return -1;
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if (data[candidate - 1] != escapeMark)
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return candidate;
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}
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}
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QuoteScanner.prototype.each = function (callback) {
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var data = this.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 matchedMark = null;
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var singleMark = '\'';
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var doubleMark = '"';
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var dataLength = data.length;
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for (; nextEnd < data.length;) {
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var nextStartSingle = findNext(data, singleMark, nextEnd);
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var nextStartDouble = findNext(data, doubleMark, nextEnd);
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if (nextStartSingle == -1)
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nextStartSingle = dataLength;
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if (nextStartDouble == -1)
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nextStartDouble = dataLength;
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if (nextStartSingle < nextStartDouble) {
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nextStart = nextStartSingle;
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matchedMark = singleMark;
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} else {
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nextStart = nextStartDouble;
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matchedMark = doubleMark;
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}
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if (nextStart == -1)
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break;
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nextEnd = findQuoteEnd(data, matchedMark, nextStart + 1, cursor);
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if (nextEnd == -1)
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break;
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var text = data.substring(nextStart, nextEnd + 1);
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tempData.push(data.substring(cursor, nextStart));
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if (text.length > 0)
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callback(text, tempData, nextStart);
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cursor = nextEnd + 1;
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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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module.exports = QuoteScanner;
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