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rOACCT/node_modules/clean-css/lib/writer/source-maps.js
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source-maps.js
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			var SourceMapGenerator = require('source-map').SourceMapGenerator;
			var all = require('./helpers').all;

			var isRemoteResource = require('../utils/is-remote-resource');

			var isWindows = process.platform == 'win32';

			var NIX_SEPARATOR_PATTERN = /\//g;
			var UNKNOWN_SOURCE = '$stdin';
			var WINDOWS_SEPARATOR = '\\';

			function store(serializeContext, element) {
			var fromString = typeof element == 'string';
			var value = fromString ? element : element[1];
			var mappings = fromString ? null : element[2];
			var wrap = serializeContext.wrap;

			wrap(serializeContext, value);
			track(serializeContext, value, mappings);
			serializeContext.output.push(value);
			}

			function wrap(serializeContext, value) {
			if (serializeContext.column + value.length > serializeContext.format.wrapAt) {
			track(serializeContext, serializeContext.format.breakWith, false);
			serializeContext.output.push(serializeContext.format.breakWith);
			}
			}

			function track(serializeContext, value, mappings) {
			var parts = value.split('\n');

			if (mappings) {
			trackAllMappings(serializeContext, mappings);
			}

			serializeContext.line += parts.length - 1;
			serializeContext.column = parts.length > 1 ? 0 : (serializeContext.column + parts.pop().length);
			}

			function trackAllMappings(serializeContext, mappings) {
			for (var i = 0, l = mappings.length; i < l; i++) {
			trackMapping(serializeContext, mappings[i]);
			}
			}

			function trackMapping(serializeContext, mapping) {
			var line = mapping[0];
			var column = mapping[1];
			var originalSource = mapping[2];
			var source = originalSource;
			var storedSource = source \|\| UNKNOWN_SOURCE;

			if (isWindows && source && !isRemoteResource(source)) {
			storedSource = source.replace(NIX_SEPARATOR_PATTERN, WINDOWS_SEPARATOR);
			}

			serializeContext.outputMap.addMapping({
			generated: {
			line: serializeContext.line,
			column: serializeContext.column
			},
			source: storedSource,
			original: {
			line: line,
			column: column
			}
			});

			if (serializeContext.inlineSources && (originalSource in serializeContext.sourcesContent)) {
			serializeContext.outputMap.setSourceContent(
			storedSource,
			serializeContext.sourcesContent[originalSource]
			);
			}
			}

			function serializeStylesAndSourceMap(tokens, context) {
			var serializeContext = {
			column: 0,
			format: context.options.format,
			indentBy: 0,
			indentWith: '',
			inlineSources: context.options.sourceMapInlineSources,
			line: 1,
			output: [],
			outputMap: new SourceMapGenerator(),
			sourcesContent: context.sourcesContent,
			spaceAfterClosingBrace: context.options.compatibility.properties.spaceAfterClosingBrace,
			store: store,
			wrap: context.options.format.wrapAt
			? wrap
			: function() { /* noop */ }
			};

			all(serializeContext, tokens);

			return {
			sourceMap: serializeContext.outputMap,
			styles: serializeContext.output.join('')
			};
			}

			module.exports = serializeStylesAndSourceMap;