mirror of https://github.com/webpack/webpack.git
98 lines
2.4 KiB
JavaScript
98 lines
2.4 KiB
JavaScript
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/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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function FlagDependencyExportsPlugin() {
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}
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module.exports = FlagDependencyExportsPlugin;
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FlagDependencyExportsPlugin.prototype.apply = function(compiler) {
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compiler.plugin("compilation", function(compilation) {
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compilation.plugin("optimize-modules-advanced", function(modules) {
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modules.forEach(function(module) {
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module.used = false;
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})
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var dependencies = {};
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var module, moduleWithExports;
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var queue = modules.slice();
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for(var i = 0; i < queue.length; i++) {
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module = queue[i];
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if(module.providedExports !== true) {
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moduleWithExports = false;
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processDependenciesBlock(module);
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if(!moduleWithExports) {
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module.providedExports = true;
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}
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}
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}
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function processDependenciesBlock(depBlock) {
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depBlock.dependencies.forEach(function(dep) {
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processDependency(dep);
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});
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depBlock.variables.forEach(function(variable) {
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variable.dependencies.forEach(function(dep) {
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processDependency(dep);
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});
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});
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depBlock.blocks.forEach(function(block) {
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processDependenciesBlock(block);
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});
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}
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function processDependency(dep, usedExports) {
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var exportDesc = dep.getExports && dep.getExports();
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if(!exportDesc) return;
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moduleWithExports = true;
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var exports = exportDesc.exports;
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var exportDeps = exportDesc.dependencies;
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if(exportDeps) {
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exportDeps.forEach(function(dep) {
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var depIdent = dep.identifier();
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var array = dependencies["$" + depIdent];
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if(!array) array = dependencies["$" + depIdent] = [];
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if(array.indexOf(module) < 0)
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array.push(module);
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});
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}
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var changed = false;
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if(exports === true) {
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module.providedExports = true;
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changed = true;
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} else if(Array.isArray(exports)) {
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if(Array.isArray(module.providedExports)) {
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changed = addToSet(module.providedExports, exports);
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} else {
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module.providedExports = exports.slice();
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changed = true;
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}
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};
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if(changed) {
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var deps = dependencies["$" + module.identifier()];
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if(deps) {
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deps.forEach(function(dep) {
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queue.push(dep);
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});
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}
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}
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}
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});
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function addToSet(a, b) {
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var changed = false;
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b.forEach(function(item) {
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if(a.indexOf(item) < 0) {
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a.push(item);
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changed = true;
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}
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});
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return changed;
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}
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});
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};
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