1 | import { relative } from 'path';
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2 | import { Promise } from 'sander';
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3 | import { parse } from 'acorn';
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4 | import MagicString from 'magic-string';
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5 | import Statement from './Statement';
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6 | import walk from './ast/walk';
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7 | import analyse from './ast/analyse';
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8 | import { blank, has, keys } from './utils/object';
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9 | import { sequence } from './utils/promise';
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10 | import { isImportDeclaration, isExportDeclaration } from './utils/map-helpers';
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11 | import getLocation from './utils/getLocation';
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12 | import makeLegalIdentifier from './utils/makeLegalIdentifier';
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13 |
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14 | const emptyArrayPromise = Promise.resolve([]);
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15 |
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16 | export default class Module {
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17 | constructor ({ path, source, bundle }) {
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18 | this.source = source;
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19 |
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20 | this.bundle = bundle;
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21 | this.path = path;
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22 | this.relativePath = relative( bundle.base, path ).slice( 0, -3 );
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23 |
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24 | this.magicString = new MagicString( source, {
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25 | filename: path
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26 | });
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27 |
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28 | this.suggestedNames = {};
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29 | this.comments = [];
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30 |
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31 |
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32 |
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33 | try {
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34 | const ast = parse( source, {
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35 | ecmaVersion: 6,
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36 | sourceType: 'module',
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37 | onComment: ( block, text, start, end ) => this.comments.push({ block, text, start, end })
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38 | });
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39 |
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40 | walk( ast, {
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41 | enter: node => {
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42 | this.magicString.addSourcemapLocation( node.start );
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43 | }
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44 | });
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45 |
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46 | this.statements = ast.body.map( node => {
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47 | const magicString = this.magicString.snip( node.start, node.end );
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48 | return new Statement( node, magicString, this );
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49 | });
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50 | } catch ( err ) {
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51 | err.code = 'PARSE_ERROR';
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52 | err.file = path;
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53 | throw err;
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54 | }
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55 |
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56 | this.importDeclarations = this.statements.filter( isImportDeclaration );
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57 | this.exportDeclarations = this.statements.filter( isExportDeclaration );
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58 |
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59 | this.analyse();
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60 | }
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61 |
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62 | analyse () {
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63 |
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64 | this.imports = {};
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65 | this.exports = {};
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66 |
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67 | this.importDeclarations.forEach( statement => {
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68 | const node = statement.node;
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69 | const source = node.source.value;
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70 |
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71 | node.specifiers.forEach( specifier => {
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72 | const isDefault = specifier.type === 'ImportDefaultSpecifier';
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73 | const isNamespace = specifier.type === 'ImportNamespaceSpecifier';
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74 |
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75 | const localName = specifier.local.name;
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76 | const name = isDefault ? 'default' : isNamespace ? '*' : specifier.imported.name;
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77 |
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78 | if ( has( this.imports, localName ) ) {
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79 | const err = new Error( `Duplicated import '${localName}'` );
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80 | err.file = this.path;
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81 | err.loc = getLocation( this.source, specifier.start );
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82 | throw err;
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83 | }
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84 |
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85 | this.imports[ localName ] = {
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86 | source,
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87 | name,
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88 | localName
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89 | };
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90 | });
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91 | });
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92 |
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93 | this.exportDeclarations.forEach( statement => {
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94 | const node = statement.node;
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95 | const source = node.source && node.source.value;
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96 |
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97 |
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98 |
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99 |
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100 | if ( node.type === 'ExportDefaultDeclaration' ) {
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101 | const isDeclaration = /Declaration$/.test( node.declaration.type );
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102 |
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103 | this.exports.default = {
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104 | statement,
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105 | name: 'default',
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106 | localName: isDeclaration ? node.declaration.id.name : 'default',
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107 | isDeclaration
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108 | };
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109 | }
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110 |
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111 |
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112 |
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113 |
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114 | else if ( node.type === 'ExportNamedDeclaration' ) {
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115 | if ( node.specifiers.length ) {
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116 |
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117 | node.specifiers.forEach( specifier => {
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118 | const localName = specifier.local.name;
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119 | const exportedName = specifier.exported.name;
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120 |
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121 | this.exports[ exportedName ] = {
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122 | localName,
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123 | exportedName
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124 | };
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125 |
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126 |
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127 | if ( source ) {
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128 | this.imports[ localName ] = {
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129 | source,
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130 | localName,
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131 | name: localName
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132 | };
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133 | }
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134 | });
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135 | }
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136 |
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137 | else {
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138 | let declaration = node.declaration;
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139 |
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140 | let name;
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141 |
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142 | if ( declaration.type === 'VariableDeclaration' ) {
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143 |
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144 | name = declaration.declarations[0].id.name;
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145 | } else {
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146 |
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147 | name = declaration.id.name;
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148 | }
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149 |
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150 | this.exports[ name ] = {
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151 | statement,
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152 | localName: name,
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153 | expression: declaration
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154 | };
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155 | }
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156 | }
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157 | });
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158 |
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159 | analyse( this.magicString, this );
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160 |
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161 | this.canonicalNames = {};
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162 |
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163 | this.definitions = {};
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164 | this.definitionPromises = {};
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165 | this.modifications = {};
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166 |
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167 | this.statements.forEach( statement => {
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168 | Object.keys( statement.defines ).forEach( name => {
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169 | this.definitions[ name ] = statement;
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170 | });
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171 |
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172 | Object.keys( statement.modifies ).forEach( name => {
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173 | if ( !has( this.modifications, name ) ) {
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174 | this.modifications[ name ] = [];
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175 | }
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176 |
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177 | this.modifications[ name ].push( statement );
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178 | });
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179 | });
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180 | }
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181 |
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182 | getCanonicalName ( localName ) {
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183 | if ( has( this.suggestedNames, localName ) ) {
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184 | localName = this.suggestedNames[ localName ];
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185 | }
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186 |
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187 | if ( !has( this.canonicalNames, localName ) ) {
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188 | let canonicalName;
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189 |
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190 | if ( has( this.imports, localName ) ) {
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191 | const importDeclaration = this.imports[ localName ];
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192 | const module = importDeclaration.module;
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193 |
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194 | if ( importDeclaration.name === '*' ) {
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195 | canonicalName = module.suggestedNames[ '*' ];
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196 | } else {
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197 | let exporterLocalName;
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198 |
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199 | if ( module.isExternal ) {
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200 | exporterLocalName = importDeclaration.name;
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201 | } else {
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202 | const exportDeclaration = module.exports[ importDeclaration.name ];
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203 | exporterLocalName = exportDeclaration.localName;
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204 | }
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205 |
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206 | canonicalName = module.getCanonicalName( exporterLocalName );
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207 | }
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208 | }
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209 |
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210 | else {
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211 | canonicalName = localName;
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212 | }
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213 |
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214 | this.canonicalNames[ localName ] = canonicalName;
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215 | }
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216 |
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217 | return this.canonicalNames[ localName ];
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218 | }
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219 |
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220 | define ( name ) {
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221 |
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222 | if ( has( this.definitionPromises, name ) ) {
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223 | return emptyArrayPromise;
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224 | }
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225 |
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226 | let promise;
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227 |
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228 |
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229 | if ( has( this.imports, name ) ) {
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230 | const importDeclaration = this.imports[ name ];
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231 |
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232 | promise = this.bundle.fetchModule( importDeclaration.source, this.path )
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233 | .then( module => {
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234 | importDeclaration.module = module;
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235 |
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236 |
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237 | if ( importDeclaration.name === 'default' ) {
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238 |
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239 | const localName = importDeclaration.localName;
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240 | let suggestion = has( this.suggestedNames, localName ) ? this.suggestedNames[ localName ] : localName;
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241 |
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242 |
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243 | while ( !module.isExternal && has( module.imports, suggestion ) ) {
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244 | suggestion = `_${suggestion}`;
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245 | }
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246 |
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247 | module.suggestName( 'default', suggestion );
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248 | } else if ( importDeclaration.name === '*' ) {
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249 | const localName = importDeclaration.localName;
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250 | const suggestion = has( this.suggestedNames, localName ) ? this.suggestedNames[ localName ] : localName;
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251 | module.suggestName( '*', suggestion );
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252 | module.suggestName( 'default', `${suggestion}__default` );
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253 | }
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254 |
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255 | if ( module.isExternal ) {
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256 | if ( importDeclaration.name === 'default' ) {
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257 | module.needsDefault = true;
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258 | } else {
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259 | module.needsNamed = true;
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260 | }
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261 |
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262 | module.importedByBundle.push( importDeclaration );
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263 | return emptyArrayPromise;
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264 | }
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265 |
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266 | if ( importDeclaration.name === '*' ) {
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267 |
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268 | if ( !~this.bundle.internalNamespaceModules.indexOf( module ) ) {
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269 | this.bundle.internalNamespaceModules.push( module );
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270 | }
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271 |
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272 | return module.expandAllStatements();
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273 | }
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274 |
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275 | const exportDeclaration = module.exports[ importDeclaration.name ];
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276 |
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277 | if ( !exportDeclaration ) {
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278 | throw new Error( `Module ${module.path} does not export ${importDeclaration.name} (imported by ${this.path})` );
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279 | }
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280 |
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281 | return module.define( exportDeclaration.localName );
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282 | });
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283 | }
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284 |
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285 |
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286 | else if ( name === 'default' && this.exports.default.isDeclaration ) {
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287 |
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288 |
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289 | promise = this.define( this.exports.default.name );
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290 | }
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291 |
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292 | else {
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293 | let statement;
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294 |
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295 | if ( name === 'default' ) {
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296 | statement = this.exports.default.statement;
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297 | } else {
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298 | statement = this.definitions[ name ];
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299 | }
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300 |
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301 | if ( statement && !statement.isIncluded ) {
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302 | promise = statement.expand();
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303 | }
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304 | }
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305 |
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306 | this.definitionPromises[ name ] = promise || emptyArrayPromise;
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307 | return this.definitionPromises[ name ];
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308 | }
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309 |
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310 | expandAllStatements ( isEntryModule ) {
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311 | let allStatements = [];
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312 |
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313 | return sequence( this.statements, statement => {
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314 |
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315 |
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316 |
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317 | if ( statement.isIncluded ) {
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318 | const index = allStatements.indexOf( statement );
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319 | if ( ~index ) {
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320 | allStatements.splice( index, 1 );
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321 | allStatements.push( statement );
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322 | }
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323 |
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324 | return;
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325 | }
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326 |
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327 |
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328 | if ( statement.isImportDeclaration ) {
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329 |
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330 |
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331 | if ( !statement.node.specifiers.length ) {
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332 | return this.bundle.fetchModule( statement.node.source.value, this.path )
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333 | .then( module => {
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334 | statement.module = module;
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335 | return module.expandAllStatements();
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336 | })
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337 | .then( statements => {
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338 | allStatements.push.apply( allStatements, statements );
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339 | });
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340 | }
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341 |
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342 | return;
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343 | }
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344 |
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345 |
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346 | if ( statement.node.type === 'ExportNamedDeclaration' && statement.node.specifiers.length ) {
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347 |
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348 | if ( isEntryModule ) {
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349 | return statement.expand().then( statements => {
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350 | allStatements.push.apply( allStatements, statements );
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351 | });
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352 | }
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353 |
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354 | return;
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355 | }
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356 |
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357 |
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358 | return statement.expand().then( statements => {
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359 | allStatements.push.apply( allStatements, statements );
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360 | });
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361 | }).then( () => {
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362 | return allStatements;
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363 | });
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364 | }
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365 |
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366 | rename ( name, replacement ) {
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367 | this.canonicalNames[ name ] = replacement;
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368 | }
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369 |
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370 | suggestName ( exportName, suggestion ) {
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371 | if ( !this.suggestedNames[ exportName ] ) {
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372 | this.suggestedNames[ exportName ] = makeLegalIdentifier( suggestion );
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373 | }
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374 | }
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375 | }
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