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