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rOACCT/node_modules/clean-css/lib/reader/input-source-map-tracker.js
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input-source-map-tracker.js
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			var SourceMapConsumer = require('source-map').SourceMapConsumer;

			function inputSourceMapTracker() {
			var maps = {};

			return {
			all: all.bind(null, maps),
			isTracking: isTracking.bind(null, maps),
			originalPositionFor: originalPositionFor.bind(null, maps),
			track: track.bind(null, maps)
			};
			}

			function all(maps) {
			return maps;
			}

			function isTracking(maps, source) {
			return source in maps;
			}

			function originalPositionFor(maps, metadata, range, selectorFallbacks) {
			var line = metadata[0];
			var column = metadata[1];
			var source = metadata[2];
			var position = {
			line: line,
			column: column + range
			};
			var originalPosition;

			while (!originalPosition && position.column > column) {
			position.column--;
			originalPosition = maps[source].originalPositionFor(position);
			}

			if (!originalPosition \|\| originalPosition.column < 0) {
			return metadata;
			}

			if (originalPosition.line === null && line > 1 && selectorFallbacks > 0) {
			return originalPositionFor(maps, [line - 1, column, source], range, selectorFallbacks - 1);
			}

			return originalPosition.line !== null
			? toMetadata(originalPosition)
			: metadata;
			}

			function toMetadata(asHash) {
			return [asHash.line, asHash.column, asHash.source];
			}

			function track(maps, source, data) {
			maps[source] = new SourceMapConsumer(data);
			}

			module.exports = inputSourceMapTracker;