54 lines
1.6 KiB
JavaScript
54 lines
1.6 KiB
JavaScript
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var placeholderBrace = '__';
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function EscapeStore(placeholderRoot) {
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this.placeholderRoot = 'ESCAPED_' + placeholderRoot + '_CLEAN_CSS';
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this.placeholderToData = {};
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this.dataToPlaceholder = {};
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this.count = 0;
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this.restoreMatcher = new RegExp(this.placeholderRoot + '(\\d+)');
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}
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EscapeStore.prototype._nextPlaceholder = function (metadata) {
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return {
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index: this.count,
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value: placeholderBrace + this.placeholderRoot + this.count++ + metadata + placeholderBrace
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};
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};
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EscapeStore.prototype.store = function (data, metadata) {
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var encodedMetadata = metadata ?
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'(' + metadata.join(',') + ')' :
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'';
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var placeholder = this.dataToPlaceholder[data];
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if (!placeholder) {
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var nextPlaceholder = this._nextPlaceholder(encodedMetadata);
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placeholder = nextPlaceholder.value;
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this.placeholderToData[nextPlaceholder.index] = data;
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this.dataToPlaceholder[data] = nextPlaceholder.value;
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}
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if (metadata)
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placeholder = placeholder.replace(/\([^\)]+\)/, encodedMetadata);
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return placeholder;
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};
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EscapeStore.prototype.nextMatch = function (data, cursor) {
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var next = {};
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next.start = data.indexOf(this.placeholderRoot, cursor) - placeholderBrace.length;
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next.end = data.indexOf(placeholderBrace, next.start + placeholderBrace.length) + placeholderBrace.length;
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if (next.start > -1 && next.end > -1)
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next.match = data.substring(next.start, next.end);
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return next;
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};
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EscapeStore.prototype.restore = function (placeholder) {
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var index = this.restoreMatcher.exec(placeholder)[1];
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return this.placeholderToData[index];
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};
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module.exports = EscapeStore;
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