diff options
Diffstat (limited to 'node_modules/clean-css/lib/reader/apply-source-maps.js')
| -rw-r--r-- | node_modules/clean-css/lib/reader/apply-source-maps.js | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/node_modules/clean-css/lib/reader/apply-source-maps.js b/node_modules/clean-css/lib/reader/apply-source-maps.js new file mode 100644 index 000000000..d2f87250e --- /dev/null +++ b/node_modules/clean-css/lib/reader/apply-source-maps.js @@ -0,0 +1,245 @@ +var fs = require('fs'); +var path = require('path'); + +var isAllowedResource = require('./is-allowed-resource'); +var loadRemoteResource = require('./load-remote-resource'); +var matchDataUri = require('./match-data-uri'); +var rebaseLocalMap = require('./rebase-local-map'); +var rebaseRemoteMap = require('./rebase-remote-map'); + +var Token = require('../tokenizer/token'); +var hasProtocol = require('../utils/has-protocol'); +var isDataUriResource = require('../utils/is-data-uri-resource'); +var isRemoteResource = require('../utils/is-remote-resource'); + +var MAP_MARKER_PATTERN = /^\/\*# sourceMappingURL=(\S+) \*\/$/; + +function applySourceMaps(tokens, context, callback) { + var applyContext = { + callback: callback, + index: 0, + inline: context.options.inline, + inlineRequest: context.options.inlineRequest, + inlineTimeout: context.options.inlineTimeout, + inputSourceMapTracker: context.inputSourceMapTracker, + localOnly: context.localOnly, + processedTokens: [], + rebaseTo: context.options.rebaseTo, + sourceTokens: tokens, + warnings: context.warnings + }; + + return context.options.sourceMap && tokens.length > 0 ? + doApplySourceMaps(applyContext) : + callback(tokens); +} + +function doApplySourceMaps(applyContext) { + var singleSourceTokens = []; + var lastSource = findTokenSource(applyContext.sourceTokens[0]); + var source; + var token; + var l; + + for (l = applyContext.sourceTokens.length; applyContext.index < l; applyContext.index++) { + token = applyContext.sourceTokens[applyContext.index]; + source = findTokenSource(token); + + if (source != lastSource) { + singleSourceTokens = []; + lastSource = source; + } + + singleSourceTokens.push(token); + applyContext.processedTokens.push(token); + + if (token[0] == Token.COMMENT && MAP_MARKER_PATTERN.test(token[1])) { + return fetchAndApplySourceMap(token[1], source, singleSourceTokens, applyContext); + } + } + + return applyContext.callback(applyContext.processedTokens); +} + +function findTokenSource(token) { + var scope; + var metadata; + + if (token[0] == Token.AT_RULE || token[0] == Token.COMMENT) { + metadata = token[2][0]; + } else { + scope = token[1][0]; + metadata = scope[2][0]; + } + + return metadata[2]; +} + +function fetchAndApplySourceMap(sourceMapComment, source, singleSourceTokens, applyContext) { + return extractInputSourceMapFrom(sourceMapComment, applyContext, function (inputSourceMap) { + if (inputSourceMap) { + applyContext.inputSourceMapTracker.track(source, inputSourceMap); + applySourceMapRecursively(singleSourceTokens, applyContext.inputSourceMapTracker); + } + + applyContext.index++; + return doApplySourceMaps(applyContext); + }); +} + +function extractInputSourceMapFrom(sourceMapComment, applyContext, whenSourceMapReady) { + var uri = MAP_MARKER_PATTERN.exec(sourceMapComment)[1]; + var absoluteUri; + var sourceMap; + var rebasedMap; + + if (isDataUriResource(uri)) { + sourceMap = extractInputSourceMapFromDataUri(uri); + return whenSourceMapReady(sourceMap); + } else if (isRemoteResource(uri)) { + return loadInputSourceMapFromRemoteUri(uri, applyContext, function (sourceMap) { + var parsedMap; + + if (sourceMap) { + parsedMap = JSON.parse(sourceMap); + rebasedMap = rebaseRemoteMap(parsedMap, uri); + whenSourceMapReady(rebasedMap); + } else { + whenSourceMapReady(null); + } + }); + } else { + // at this point `uri` is already rebased, see lib/reader/rebase.js#rebaseSourceMapComment + // it is rebased to be consistent with rebasing other URIs + // however here we need to resolve it back to read it from disk + absoluteUri = path.resolve(applyContext.rebaseTo, uri); + sourceMap = loadInputSourceMapFromLocalUri(absoluteUri, applyContext); + + if (sourceMap) { + rebasedMap = rebaseLocalMap(sourceMap, absoluteUri, applyContext.rebaseTo); + return whenSourceMapReady(rebasedMap); + } else { + return whenSourceMapReady(null); + } + } +} + +function extractInputSourceMapFromDataUri(uri) { + var dataUriMatch = matchDataUri(uri); + var charset = dataUriMatch[2] ? dataUriMatch[2].split(/[=;]/)[2] : 'us-ascii'; + var encoding = dataUriMatch[3] ? dataUriMatch[3].split(';')[1] : 'utf8'; + var data = encoding == 'utf8' ? global.unescape(dataUriMatch[4]) : dataUriMatch[4]; + + var buffer = new Buffer(data, encoding); + buffer.charset = charset; + + return JSON.parse(buffer.toString()); +} + +function loadInputSourceMapFromRemoteUri(uri, applyContext, whenLoaded) { + var isAllowed = isAllowedResource(uri, true, applyContext.inline); + var isRuntimeResource = !hasProtocol(uri); + + if (applyContext.localOnly) { + applyContext.warnings.push('Cannot fetch remote resource from "' + uri + '" as no callback given.'); + return whenLoaded(null); + } else if (isRuntimeResource) { + applyContext.warnings.push('Cannot fetch "' + uri + '" as no protocol given.'); + return whenLoaded(null); + } else if (!isAllowed) { + applyContext.warnings.push('Cannot fetch "' + uri + '" as resource is not allowed.'); + return whenLoaded(null); + } + + loadRemoteResource(uri, applyContext.inlineRequest, applyContext.inlineTimeout, function (error, body) { + if (error) { + applyContext.warnings.push('Missing source map at "' + uri + '" - ' + error); + return whenLoaded(null); + } + + whenLoaded(body); + }); +} + +function loadInputSourceMapFromLocalUri(uri, applyContext) { + var isAllowed = isAllowedResource(uri, false, applyContext.inline); + var sourceMap; + + if (!fs.existsSync(uri) || !fs.statSync(uri).isFile()) { + applyContext.warnings.push('Ignoring local source map at "' + uri + '" as resource is missing.'); + return null; + } else if (!isAllowed) { + applyContext.warnings.push('Cannot fetch "' + uri + '" as resource is not allowed.'); + return null; + } + + sourceMap = fs.readFileSync(uri, 'utf-8'); + return JSON.parse(sourceMap); +} + +function applySourceMapRecursively(tokens, inputSourceMapTracker) { + var token; + var i, l; + + for (i = 0, l = tokens.length; i < l; i++) { + token = tokens[i]; + + switch (token[0]) { + case Token.AT_RULE: + applySourceMapTo(token, inputSourceMapTracker); + break; + case Token.AT_RULE_BLOCK: + applySourceMapRecursively(token[1], inputSourceMapTracker); + applySourceMapRecursively(token[2], inputSourceMapTracker); + break; + case Token.AT_RULE_BLOCK_SCOPE: + applySourceMapTo(token, inputSourceMapTracker); + break; + case Token.NESTED_BLOCK: + applySourceMapRecursively(token[1], inputSourceMapTracker); + applySourceMapRecursively(token[2], inputSourceMapTracker); + break; + case Token.NESTED_BLOCK_SCOPE: + applySourceMapTo(token, inputSourceMapTracker); + break; + case Token.COMMENT: + applySourceMapTo(token, inputSourceMapTracker); + break; + case Token.PROPERTY: + applySourceMapRecursively(token, inputSourceMapTracker); + break; + case Token.PROPERTY_BLOCK: + applySourceMapRecursively(token[1], inputSourceMapTracker); + break; + case Token.PROPERTY_NAME: + applySourceMapTo(token, inputSourceMapTracker); + break; + case Token.PROPERTY_VALUE: + applySourceMapTo(token, inputSourceMapTracker); + break; + case Token.RULE: + applySourceMapRecursively(token[1], inputSourceMapTracker); + applySourceMapRecursively(token[2], inputSourceMapTracker); + break; + case Token.RULE_SCOPE: + applySourceMapTo(token, inputSourceMapTracker); + } + } + + return tokens; +} + +function applySourceMapTo(token, inputSourceMapTracker) { + var value = token[1]; + var metadata = token[2]; + var newMetadata = []; + var i, l; + + for (i = 0, l = metadata.length; i < l; i++) { + newMetadata.push(inputSourceMapTracker.originalPositionFor(metadata[i], value.length)); + } + + token[2] = newMetadata; +} + +module.exports = applySourceMaps; |