var EscapeStore = require('./escape-store');
var QuoteScanner = require('../utils/quote-scanner');
var lineBreak = require('os').EOL;
function FreeTextProcessor(saveWaypoints) {
this.matches = new EscapeStore('FREE_TEXT');
this.saveWaypoints = saveWaypoints;
}
// Strip content tags by replacing them by the a special
// marker for further restoring. It's done via string scanning
// instead of regexps to speed up the process.
FreeTextProcessor.prototype.escape = function (data) {
var self = this;
var breaksCount;
var lastBreakAt;
var indent;
var metadata;
var saveWaypoints = this.saveWaypoints;
return new QuoteScanner(data).each(function (match, store) {
if (saveWaypoints) {
breaksCount = match.split(lineBreak).length - 1;
lastBreakAt = match.lastIndexOf(lineBreak);
indent = lastBreakAt > 0 ?
match.substring(lastBreakAt + lineBreak.length).length :
match.length;
metadata = [breaksCount, indent];
}
var placeholder = self.matches.store(match, metadata);
store.push(placeholder);
});
};
function normalize(text, data, prefixContext, cursor) {
// FIXME: this is even a bigger hack now - see #407
var searchIn = data;
if (prefixContext) {
searchIn = prefixContext + data.substring(0, data.indexOf('__ESCAPED_FREE_TEXT_CLEAN_CSS'));
cursor = searchIn.length;
}
var lastSemicolon = searchIn.lastIndexOf(';', cursor);
var lastOpenBrace = searchIn.lastIndexOf('{', cursor);
var lastOne = 0;
if (lastSemicolon > -1 && lastOpenBrace > -1)
lastOne = Math.max(lastSemicolon, lastOpenBrace);
else if (lastSemicolon == -1)
lastOne = lastOpenBrace;
else
lastOne = lastSemicolon;
var context = searchIn.substring(lastOne + 1, cursor);
if (/\[[\w\d\-]+[\*\|\~\^\$]?=$/.test(context)) {
text = text
.replace(/\\\n|\\\r\n/g, '')
.replace(/\n|\r\n/g, '');
}
if (/^['"][a-zA-Z][a-zA-Z\d\-_]+['"]$/.test(text) && !/format\($/.test(context)) {
var isFont = /^(font|font\-family):/.test(context);
var isAttribute = /\[[\w\d\-]+[\*\|\~\^\$]?=$/.test(context);
var isKeyframe = /@(-moz-|-o-|-webkit-)?keyframes /.test(context);
var isAnimation = /^(-moz-|-o-|-webkit-)?animation(-name)?:/.test(context);
if (isFont || isAttribute || isKeyframe || isAnimation)
text = text.substring(1, text.length - 1);
}
return text;
}
FreeTextProcessor.prototype.restore = function (data, prefixContext) {
var tempData = [];
var cursor = 0;
for (; cursor < data.length;) {
var nextMatch = this.matches.nextMatch(data, cursor);
if (nextMatch.start < 0)
break;
tempData.push(data.substring(cursor, nextMatch.start));
var text = normalize(this.matches.restore(nextMatch.match), data, prefixContext, nextMatch.start);
tempData.push(text);
cursor = nextMatch.end;
}
return tempData.length > 0 ?
tempData.join('') + data.substring(cursor, data.length) :
data;
};
module.exports = FreeTextProcessor;