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8 |
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9 | 'use strict';
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10 |
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11 | module.exports = function(grunt) {
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12 | var path = require('path');
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13 | var chalk = require('chalk');
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14 | var _ = require('lodash');
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15 |
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16 | grunt.registerMultiTask('coffee', 'Compile CoffeeScript files into JavaScript', function() {
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17 | var options = this.options({
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18 | bare: false,
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19 | join: false,
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20 | sourceMap: false,
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21 | separator: grunt.util.linefeed,
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22 | });
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23 |
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24 | options.separator = grunt.util.normalizelf(options.separator);
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25 |
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26 | this.files.forEach(function(f) {
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27 | var validFiles = removeInvalidFiles(f);
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28 |
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29 | if (options.sourceMap === true) {
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30 | var paths = createOutputPaths(f.dest);
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31 |
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32 | var fileOptions = _.extend({ sourceMapDir: paths.destDir }, options);
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33 | writeFileAndMap(paths, compileWithMaps(validFiles, fileOptions, paths), fileOptions);
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34 | } else if (options.join === true) {
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35 | writeFile(f.dest, concatInput(validFiles, options));
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36 | } else {
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37 | writeFile(f.dest, concatOutput(validFiles, options));
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38 | }
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39 | });
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40 | });
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41 |
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42 | var isLiterate = function(ext) {
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43 | return (ext === ".litcoffee" || ext === ".md");
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44 | };
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45 |
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46 | var removeInvalidFiles = function(files) {
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47 | return files.src.filter(function(filepath) {
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48 | if (!grunt.file.exists(filepath)) {
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49 | grunt.log.warn('Source file "' + filepath + '" not found.');
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50 | return false;
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51 | } else {
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52 | return true;
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53 | }
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54 | });
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55 | };
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56 |
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57 | var createOutputPaths = function(destination) {
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58 | var fileName = path.basename(destination, path.extname(destination));
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59 | return {
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60 | dest: destination,
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61 | destName: fileName,
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62 | destDir: appendTrailingSlash(path.dirname(destination)),
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63 | mapFileName: fileName + '.js.map'
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64 | };
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65 | };
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66 |
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67 | var appendTrailingSlash = function(path) {
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68 | if (path.length > 0) {
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69 | return path + '/';
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70 | } else {
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71 | return path;
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72 | }
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73 | };
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74 |
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75 | var compileWithMaps = function(files, options, paths) {
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76 | if (!hasUniformExtensions(files)) {
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77 | return;
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78 | }
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79 |
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80 | var mapOptions, filepath;
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81 |
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82 | if (files.length > 1) {
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83 | mapOptions = createOptionsForJoin(files, paths, options.separator);
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84 | } else {
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85 | mapOptions = createOptionsForFile(files[0], paths);
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86 | filepath = files[0];
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87 | }
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88 |
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89 | options = _.extend({
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90 | generatedFile: path.basename(paths.dest),
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91 | sourceRoot: mapOptions.sourceRoot,
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92 | sourceFiles: mapOptions.sourceFiles
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93 | }, options);
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94 |
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95 | var output = compileCoffee(mapOptions.code, options, filepath);
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96 | appendFooter(output, paths, options);
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97 | return output;
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98 | };
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99 |
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100 | var hasUniformExtensions = function(files) {
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101 |
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102 | var extensions = _.uniq(files.map(path.extname));
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103 |
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104 | if (extensions.length > 1) {
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105 | grunt.fail.warn('Join and sourceMap options require input files share the same extension (found ' + extensions.join(', ') + ').');
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106 | return false;
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107 | } else {
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108 | return true;
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109 | }
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110 | };
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111 |
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112 | var createOptionsForJoin = function(files, paths, separator) {
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113 | var code = concatFiles(files, separator);
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114 | var targetFileName = paths.destName + '.src.coffee';
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115 | grunt.file.write(paths.destDir + targetFileName, code);
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116 |
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117 | return {
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118 | code: code,
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119 | sourceFiles: [targetFileName],
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120 | sourceRoot: ''
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121 | };
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122 | };
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123 |
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124 | var concatFiles = function(files, separator) {
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125 | return files.map(grunt.file.read).join(separator);
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126 | };
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127 |
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128 | var createOptionsForFile = function(file, paths) {
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129 | return {
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130 | code: grunt.file.read(file),
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131 | sourceFiles: [path.basename(file)],
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132 | sourceRoot: appendTrailingSlash(path.relative(paths.destDir, path.dirname(file)))
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133 | };
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134 | };
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135 |
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136 | var appendFooter = function(output, paths, options) {
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137 |
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138 | var sourceMappingDir = paths.destDir.replace(/[^/]+/g, '..') + options.sourceMapDir;
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139 |
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140 | output.js = output.js + '\n//# sourceMappingURL=' + sourceMappingDir + paths.mapFileName + '\n';
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141 | };
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142 |
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143 | var concatInput = function(files, options) {
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144 | if (hasUniformExtensions(files)) {
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145 | var code = concatFiles(files, options.separator);
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146 | return compileCoffee(code, options);
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147 | }
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148 | };
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149 |
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150 | var concatOutput = function(files, options) {
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151 | return files.map(function(filepath) {
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152 | var code = grunt.file.read(filepath);
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153 | return compileCoffee(code, options, filepath);
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154 | }).join(options.separator);
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155 | };
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156 |
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157 | var compileCoffee = function(code, options, filepath) {
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158 | var coffeeOptions = _.clone(options);
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159 | if (filepath) {
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160 | coffeeOptions.filename = filepath;
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161 | coffeeOptions.literate = isLiterate(path.extname(filepath));
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162 | }
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163 |
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164 | try {
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165 | return require('coffee-script').compile(code, coffeeOptions);
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166 | } catch (e) {
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167 | if (e.location == null ||
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168 | e.location.first_column == null ||
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169 | e.location.first_line == null) {
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170 | grunt.log.error('Got an unexpected exception ' +
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171 | 'from the coffee-script compiler. ' +
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172 | 'The original exception was: ' +
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173 | e);
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174 | grunt.log.error('(The coffee-script compiler should not raise *unexpected* exceptions. ' +
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175 | 'You can file this error as an issue of the coffee-script compiler: ' +
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176 | 'https://github.com/jashkenas/coffee-script/issues)');
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177 | } else {
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178 | var firstColumn = e.location.first_column;
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179 | var firstLine = e.location.first_line;
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180 | var codeLine = code.split('\n')[firstLine];
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181 | var errorArrows = chalk.red('>>') + ' ';
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182 | var offendingCharacter;
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183 |
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184 | if (firstColumn < codeLine.length) {
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185 | offendingCharacter = chalk.red(codeLine[firstColumn]);
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186 | } else {
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187 | offendingCharacter = '';
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188 | }
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189 |
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190 | grunt.log.error(e);
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191 | grunt.log.error('In file: ' + filepath);
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192 | grunt.log.error('On line: ' + firstLine);
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193 |
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194 |
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195 | grunt.log.writeln(errorArrows + codeLine.substring(0, firstColumn) +
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196 | offendingCharacter + codeLine.substring(firstColumn + 1));
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197 | grunt.log.writeln(errorArrows + grunt.util.repeat(firstColumn, ' ') +
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198 | chalk.red('^'));
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199 | }
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200 | grunt.fail.warn('CoffeeScript failed to compile.');
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201 | }
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202 | };
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203 |
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204 | var writeFileAndMap = function(paths, output, options) {
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205 | if (!output || output.js.length === 0) {
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206 | warnOnEmptyFile(paths.dest);
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207 | return;
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208 | }
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209 |
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210 | writeCompiledFile(paths.dest, output.js);
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211 | writeSourceMapFile(options.sourceMapDir + paths.mapFileName, output.v3SourceMap);
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212 | };
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213 |
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214 | var warnOnEmptyFile = function(path) {
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215 | grunt.log.warn('Destination "' + path + '" not written because compiled files were empty.');
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216 | };
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217 |
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218 | var writeFile = function(path, output) {
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219 | if (output.length < 1) {
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220 | warnOnEmptyFile(path);
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221 | return false;
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222 | } else {
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223 | grunt.file.write(path, output);
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224 | return true;
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225 | }
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226 | };
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227 |
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228 | var writeCompiledFile = function(path, output) {
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229 | if (writeFile(path, output)) {
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230 | grunt.log.writeln('File ' + chalk.cyan(path) + ' created.');
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231 | }
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232 | };
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233 | var writeSourceMapFile = function(path, output) {
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234 | if (writeFile(path, output)) {
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235 | grunt.log.writeln('File ' + chalk.cyan(path) + ' created (source map).');
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236 | }
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237 | };
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238 | };
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