webpack/lib/HotModuleReplacementPlugin.js at master · codeinvain/webpack · GitHub

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MIT License http://www.opensource.org/licenses/mit-license.php

Author Tobias Koppers @sokra

var Template = require("./Template");

var BasicEvaluatedExpression = require("./BasicEvaluatedExpression");

var ModuleHotAcceptDependency = require("./dependencies/ModuleHotAcceptDependency");

var ModuleHotDeclineDependency = require("./dependencies/ModuleHotDeclineDependency");

var RawSource = require("webpack-sources").RawSource;

var ConstDependency = require("./dependencies/ConstDependency");

var NullFactory = require("./NullFactory");

function HotModuleReplacementPlugin(options) {

options = options || {};

this.multiStep = options.multiStep;

this.fullBuildTimeout = options.fullBuildTimeout || 200;

}

module.exports = HotModuleReplacementPlugin;

HotModuleReplacementPlugin.prototype.apply = function(compiler) {

var multiStep = this.multiStep;

var fullBuildTimeout = this.fullBuildTimeout;

var hotUpdateChunkFilename = compiler.options.output.hotUpdateChunkFilename;

var hotUpdateMainFilename = compiler.options.output.hotUpdateMainFilename;

compiler.plugin("compilation", function(compilation, params) {

var hotUpdateChunkTemplate = compilation.hotUpdateChunkTemplate;

if(!hotUpdateChunkTemplate) return;

var normalModuleFactory = params.normalModuleFactory;

compilation.dependencyFactories.set(ConstDependency, new NullFactory());

compilation.dependencyTemplates.set(ConstDependency, new ConstDependency.Template());

compilation.dependencyFactories.set(ModuleHotAcceptDependency, normalModuleFactory);

compilation.dependencyTemplates.set(ModuleHotAcceptDependency, new ModuleHotAcceptDependency.Template());

compilation.dependencyFactories.set(ModuleHotDeclineDependency, normalModuleFactory);

compilation.dependencyTemplates.set(ModuleHotDeclineDependency, new ModuleHotDeclineDependency.Template());

compilation.plugin("record", function(compilation, records) {

if(records.hash === this.hash) return;

records.hash = compilation.hash;

records.moduleHashs = {};

this.modules.forEach(function(module) {

var identifier = module.identifier();

var hash = require("crypto").createHash("md5");

module.updateHash(hash);

records.moduleHashs[identifier] = hash.digest("hex");

});

records.chunkHashs = {};

this.chunks.forEach(function(chunk) {

records.chunkHashs[chunk.id] = chunk.hash;

});

records.chunkModuleIds = {};

this.chunks.forEach(function(chunk) {

records.chunkModuleIds[chunk.id] = chunk.modules.map(function(m) {

return m.id;

});

var initialPass = false;

var recompilation = false;

compilation.plugin("after-hash", function() {

var records = this.records;

if(!records) {

initialPass = true;

return;

}

if(!records.hash)

initialPass = true;

var preHash = records.preHash || "x";

var prepreHash = records.prepreHash || "x";

if(preHash === this.hash) {

recompilation = true;

this.modifyHash(prepreHash);

return;

}

records.prepreHash = records.hash || "x";

records.preHash = this.hash;

this.modifyHash(records.prepreHash);

});

compilation.plugin("should-generate-chunk-assets", function() {

if(multiStep && !recompilation && !initialPass)

return false;

});

compilation.plugin("need-additional-pass", function() {

if(multiStep && !recompilation && !initialPass)

return true;

});

compiler.plugin("additional-pass", function(callback) {

if(multiStep)

return setTimeout(callback, fullBuildTimeout);

return callback();

});

compilation.plugin("additional-chunk-assets", function() {

var records = this.records;

if(records.hash === this.hash) return;

if(!records.moduleHashs || !records.chunkHashs || !records.chunkModuleIds) return;

this.modules.forEach(function(module) {

var identifier = module.identifier();

var hash = require("crypto").createHash("md5");

module.updateHash(hash);

hash = hash.digest("hex");

module.hotUpdate = records.moduleHashs[identifier] !== hash;

});

var hotUpdateMainContent = {

h: this.hash,

c: {}

};

Object.keys(records.chunkHashs).forEach(function(chunkId) {

chunkId = +chunkId;

var currentChunk = this.chunks.filter(function(chunk) {

return chunk.id === chunkId;

})[0];

if(currentChunk) {

var newModules = currentChunk.modules.filter(function(module) {

return module.hotUpdate;

});

var allModules = {};

currentChunk.modules.forEach(function(module) {

allModules[module.id] = true;

});

var removedModules = records.chunkModuleIds[chunkId].filter(function(id) {

return !allModules[id];

});

if(newModules.length > 0 || removedModules.length > 0) {

var source = hotUpdateChunkTemplate.render(chunkId, newModules, removedModules, this.hash, this.moduleTemplate, this.dependencyTemplates);

var filename = this.getPath(hotUpdateChunkFilename, {

hash: records.hash,

chunk: currentChunk

});

this.additionalChunkAssets.push(filename);

this.assets[filename] = source;

hotUpdateMainContent.c[chunkId] = true;

currentChunk.files.push(filename);

this.applyPlugins("chunk-asset", currentChunk, filename);

}

} else {

hotUpdateMainContent.c[chunkId] = false;

}

}, this);

var source = new RawSource(JSON.stringify(hotUpdateMainContent));

var filename = this.getPath(hotUpdateMainFilename, {

hash: records.hash

});

this.assets[filename] = source;

});

compilation.mainTemplate.plugin("hash", function(hash) {

hash.update("HotMainTemplateDecorator");

});

compilation.mainTemplate.plugin("module-require", function(_, chunk, hash, varModuleId) {

return "hotCreateRequire(" + varModuleId + ")";

});

compilation.mainTemplate.plugin("require-extensions", function(source) {

var buf = [source];

buf.push("");

buf.push("// __webpack_hash__");

buf.push(this.requireFn + ".h = function() { return hotCurrentHash; };");

return this.asString(buf);

});

compilation.mainTemplate.plugin("bootstrap", function(source, chunk, hash) {

source = this.applyPluginsWaterfall("hot-bootstrap", source, chunk, hash);

return this.asString([

source,

"",

hotInitCode

.replace(/\$require\$/g, this.requireFn)

.replace(/\$hash\$/g, JSON.stringify(hash))

.replace(/\/\*foreachInstalledChunks\*\//g, chunk.chunks.length > 0 ? "for(var chunkId in installedChunks)" : "var chunkId = " + chunk.id + ";")

]);

});

compilation.mainTemplate.plugin("global-hash", function() {

return true;

});

compilation.mainTemplate.plugin("current-hash", function(_, length) {

if(isFinite(length))

return "hotCurrentHash.substr(0, " + length + ")";

else

return "hotCurrentHash";

});

compilation.mainTemplate.plugin("module-obj", function(source, chunk, hash, varModuleId) {

return this.asString([

source + ",",

"hot: hotCreateModule(" + varModuleId + "),",

"parents: (hotCurrentParentsTemp = hotCurrentParents, hotCurrentParents = [], hotCurrentParentsTemp),",

"children: []"

]);

});

params.normalModuleFactory.plugin("parser", function(parser, parserOptions) {

parser.plugin("expression __webpack_hash__", function(expr) {

var dep = new ConstDependency("__webpack_require__.h()", expr.range);

dep.loc = expr.loc;

this.state.current.addDependency(dep);

return true;

});

parser.plugin("evaluate typeof __webpack_hash__", function(expr) {

return new BasicEvaluatedExpression().setString("string").setRange(expr.range);

});

parser.plugin("evaluate Identifier module.hot", function(expr) {

return new BasicEvaluatedExpression()

.setBoolean(!!this.state.compilation.hotUpdateChunkTemplate)

.setRange(expr.range);

});

parser.plugin("call module.hot.accept", function(expr) {

if(!this.state.compilation.hotUpdateChunkTemplate) return false;

if(expr.arguments.length >= 1) {

var arg = this.evaluateExpression(expr.arguments[0]);

var params = [],

requests = [];

if(arg.isString()) {

params = [arg];

} else if(arg.isArray()) {

params = arg.items.filter(function(param) {

return param.isString();

});

}

if(params.length > 0) {

params.forEach(function(param, idx) {

var request = param.string;

var dep = new ModuleHotAcceptDependency(request, param.range);

dep.optional = true;

dep.loc = Object.create(expr.loc);

dep.loc.index = idx;

this.state.module.addDependency(dep);

requests.push(request);

}.bind(this));

if(expr.arguments.length > 1)

this.applyPluginsBailResult("hot accept callback", expr.arguments[1], requests);

else

this.applyPluginsBailResult("hot accept without callback", expr, requests);

}

});

parser.plugin("call module.hot.decline", function(expr) {

if(!this.state.compilation.hotUpdateChunkTemplate) return false;

if(expr.arguments.length === 1) {

var arg = this.evaluateExpression(expr.arguments[0]);

var params = [];

if(arg.isString()) {

params = [arg];

} else if(arg.isArray()) {

params = arg.items.filter(function(param) {

return param.isString();

});

}

params.forEach(function(param, idx) {

var dep = new ModuleHotDeclineDependency(param.string, param.range);

dep.optional = true;

dep.loc = Object.create(expr.loc);

dep.loc.index = idx;

this.state.module.addDependency(dep);

}.bind(this));

}

});

parser.plugin("expression module.hot", function() {

return true;

});

};

var hotInitCode = Template.getFunctionContent(require("./HotModuleReplacement.runtime.js"));

webpack/lib/HotModuleReplacementPlugin.js at master · codeinvain/webpack · GitHub

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