1 | var fs = require('fs');
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2 | var path = require('path');
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3 |
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4 | var isAllowedResource = require('./is-allowed-resource');
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5 | var matchDataUri = require('./match-data-uri');
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6 | var rebaseLocalMap = require('./rebase-local-map');
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7 | var rebaseRemoteMap = require('./rebase-remote-map');
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8 |
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9 | var Token = require('../tokenizer/token');
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10 | var hasProtocol = require('../utils/has-protocol');
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11 | var isDataUriResource = require('../utils/is-data-uri-resource');
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12 | var isRemoteResource = require('../utils/is-remote-resource');
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13 |
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14 | var MAP_MARKER_PATTERN = /^\/\*# sourceMappingURL=(\S+) \*\/$/;
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15 |
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16 | function applySourceMaps(tokens, context, callback) {
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17 | var applyContext = {
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18 | callback: callback,
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19 | fetch: context.options.fetch,
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20 | index: 0,
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21 | inline: context.options.inline,
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22 | inlineRequest: context.options.inlineRequest,
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23 | inlineTimeout: context.options.inlineTimeout,
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24 | inputSourceMapTracker: context.inputSourceMapTracker,
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25 | localOnly: context.localOnly,
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26 | processedTokens: [],
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27 | rebaseTo: context.options.rebaseTo,
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28 | sourceTokens: tokens,
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29 | warnings: context.warnings
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30 | };
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31 |
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32 | return context.options.sourceMap && tokens.length > 0 ?
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33 | doApplySourceMaps(applyContext) :
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34 | callback(tokens);
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35 | }
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36 |
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37 | function doApplySourceMaps(applyContext) {
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38 | var singleSourceTokens = [];
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39 | var lastSource = findTokenSource(applyContext.sourceTokens[0]);
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40 | var source;
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41 | var token;
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42 | var l;
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43 |
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44 | for (l = applyContext.sourceTokens.length; applyContext.index < l; applyContext.index++) {
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45 | token = applyContext.sourceTokens[applyContext.index];
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46 | source = findTokenSource(token);
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47 |
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48 | if (source != lastSource) {
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49 | singleSourceTokens = [];
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50 | lastSource = source;
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51 | }
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52 |
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53 | singleSourceTokens.push(token);
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54 | applyContext.processedTokens.push(token);
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55 |
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56 | if (token[0] == Token.COMMENT && MAP_MARKER_PATTERN.test(token[1])) {
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57 | return fetchAndApplySourceMap(token[1], source, singleSourceTokens, applyContext);
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58 | }
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59 | }
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60 |
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61 | return applyContext.callback(applyContext.processedTokens);
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62 | }
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63 |
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64 | function findTokenSource(token) {
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65 | var scope;
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66 | var metadata;
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67 |
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68 | if (token[0] == Token.AT_RULE || token[0] == Token.COMMENT) {
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69 | metadata = token[2][0];
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70 | } else {
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71 | scope = token[1][0];
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72 | metadata = scope[2][0];
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73 | }
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74 |
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75 | return metadata[2];
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76 | }
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77 |
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78 | function fetchAndApplySourceMap(sourceMapComment, source, singleSourceTokens, applyContext) {
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79 | return extractInputSourceMapFrom(sourceMapComment, applyContext, function (inputSourceMap) {
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80 | if (inputSourceMap) {
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81 | applyContext.inputSourceMapTracker.track(source, inputSourceMap);
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82 | applySourceMapRecursively(singleSourceTokens, applyContext.inputSourceMapTracker);
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83 | }
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84 |
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85 | applyContext.index++;
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86 | return doApplySourceMaps(applyContext);
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87 | });
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88 | }
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89 |
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90 | function extractInputSourceMapFrom(sourceMapComment, applyContext, whenSourceMapReady) {
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91 | var uri = MAP_MARKER_PATTERN.exec(sourceMapComment)[1];
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92 | var absoluteUri;
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93 | var sourceMap;
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94 | var rebasedMap;
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95 |
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96 | if (isDataUriResource(uri)) {
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97 | sourceMap = extractInputSourceMapFromDataUri(uri);
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98 | return whenSourceMapReady(sourceMap);
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99 | } else if (isRemoteResource(uri)) {
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100 | return loadInputSourceMapFromRemoteUri(uri, applyContext, function (sourceMap) {
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101 | var parsedMap;
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102 |
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103 | if (sourceMap) {
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104 | parsedMap = JSON.parse(sourceMap);
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105 | rebasedMap = rebaseRemoteMap(parsedMap, uri);
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106 | whenSourceMapReady(rebasedMap);
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107 | } else {
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108 | whenSourceMapReady(null);
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109 | }
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110 | });
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111 | } else {
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112 |
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113 |
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114 |
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115 | absoluteUri = path.resolve(applyContext.rebaseTo, uri);
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116 | sourceMap = loadInputSourceMapFromLocalUri(absoluteUri, applyContext);
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117 |
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118 | if (sourceMap) {
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119 | rebasedMap = rebaseLocalMap(sourceMap, absoluteUri, applyContext.rebaseTo);
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120 | return whenSourceMapReady(rebasedMap);
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121 | } else {
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122 | return whenSourceMapReady(null);
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123 | }
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124 | }
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125 | }
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126 |
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127 | function extractInputSourceMapFromDataUri(uri) {
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128 | var dataUriMatch = matchDataUri(uri);
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129 | var charset = dataUriMatch[2] ? dataUriMatch[2].split(/[=;]/)[2] : 'us-ascii';
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130 | var encoding = dataUriMatch[3] ? dataUriMatch[3].split(';')[1] : 'utf8';
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131 | var data = encoding == 'utf8' ? global.unescape(dataUriMatch[4]) : dataUriMatch[4];
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132 |
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133 | var buffer = new Buffer(data, encoding);
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134 | buffer.charset = charset;
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135 |
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136 | return JSON.parse(buffer.toString());
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137 | }
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138 |
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139 | function loadInputSourceMapFromRemoteUri(uri, applyContext, whenLoaded) {
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140 | var isAllowed = isAllowedResource(uri, true, applyContext.inline);
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141 | var isRuntimeResource = !hasProtocol(uri);
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142 |
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143 | if (applyContext.localOnly) {
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144 | applyContext.warnings.push('Cannot fetch remote resource from "' + uri + '" as no callback given.');
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145 | return whenLoaded(null);
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146 | } else if (isRuntimeResource) {
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147 | applyContext.warnings.push('Cannot fetch "' + uri + '" as no protocol given.');
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148 | return whenLoaded(null);
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149 | } else if (!isAllowed) {
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150 | applyContext.warnings.push('Cannot fetch "' + uri + '" as resource is not allowed.');
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151 | return whenLoaded(null);
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152 | }
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153 |
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154 | applyContext.fetch(uri, applyContext.inlineRequest, applyContext.inlineTimeout, function (error, body) {
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155 | if (error) {
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156 | applyContext.warnings.push('Missing source map at "' + uri + '" - ' + error);
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157 | return whenLoaded(null);
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158 | }
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159 |
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160 | whenLoaded(body);
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161 | });
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162 | }
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163 |
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164 | function loadInputSourceMapFromLocalUri(uri, applyContext) {
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165 | var isAllowed = isAllowedResource(uri, false, applyContext.inline);
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166 | var sourceMap;
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167 |
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168 | if (!fs.existsSync(uri) || !fs.statSync(uri).isFile()) {
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169 | applyContext.warnings.push('Ignoring local source map at "' + uri + '" as resource is missing.');
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170 | return null;
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171 | } else if (!isAllowed) {
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172 | applyContext.warnings.push('Cannot fetch "' + uri + '" as resource is not allowed.');
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173 | return null;
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174 | }
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175 |
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176 | sourceMap = fs.readFileSync(uri, 'utf-8');
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177 | return JSON.parse(sourceMap);
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178 | }
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179 |
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180 | function applySourceMapRecursively(tokens, inputSourceMapTracker) {
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181 | var token;
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182 | var i, l;
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183 |
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184 | for (i = 0, l = tokens.length; i < l; i++) {
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185 | token = tokens[i];
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186 |
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187 | switch (token[0]) {
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188 | case Token.AT_RULE:
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189 | applySourceMapTo(token, inputSourceMapTracker);
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190 | break;
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191 | case Token.AT_RULE_BLOCK:
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192 | applySourceMapRecursively(token[1], inputSourceMapTracker);
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193 | applySourceMapRecursively(token[2], inputSourceMapTracker);
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194 | break;
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195 | case Token.AT_RULE_BLOCK_SCOPE:
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196 | applySourceMapTo(token, inputSourceMapTracker);
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197 | break;
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198 | case Token.NESTED_BLOCK:
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199 | applySourceMapRecursively(token[1], inputSourceMapTracker);
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200 | applySourceMapRecursively(token[2], inputSourceMapTracker);
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201 | break;
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202 | case Token.NESTED_BLOCK_SCOPE:
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203 | applySourceMapTo(token, inputSourceMapTracker);
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204 | break;
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205 | case Token.COMMENT:
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206 | applySourceMapTo(token, inputSourceMapTracker);
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207 | break;
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208 | case Token.PROPERTY:
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209 | applySourceMapRecursively(token, inputSourceMapTracker);
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210 | break;
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211 | case Token.PROPERTY_BLOCK:
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212 | applySourceMapRecursively(token[1], inputSourceMapTracker);
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213 | break;
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214 | case Token.PROPERTY_NAME:
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215 | applySourceMapTo(token, inputSourceMapTracker);
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216 | break;
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217 | case Token.PROPERTY_VALUE:
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218 | applySourceMapTo(token, inputSourceMapTracker);
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219 | break;
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220 | case Token.RULE:
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221 | applySourceMapRecursively(token[1], inputSourceMapTracker);
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222 | applySourceMapRecursively(token[2], inputSourceMapTracker);
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223 | break;
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224 | case Token.RULE_SCOPE:
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225 | applySourceMapTo(token, inputSourceMapTracker);
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226 | }
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227 | }
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228 |
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229 | return tokens;
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230 | }
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231 |
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232 | function applySourceMapTo(token, inputSourceMapTracker) {
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233 | var value = token[1];
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234 | var metadata = token[2];
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235 | var newMetadata = [];
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236 | var i, l;
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237 |
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238 | for (i = 0, l = metadata.length; i < l; i++) {
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239 | newMetadata.push(inputSourceMapTracker.originalPositionFor(metadata[i], value.length));
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240 | }
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241 |
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242 | token[2] = newMetadata;
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243 | }
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244 |
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245 | module.exports = applySourceMaps;
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