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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const Queue = require("./util/Queue");
const addToSet = (a, b) => {
let changed = false;
for (const item of b) {
if (!a.has(item)) {
a.add(item);
changed = true;
}
}
return changed;
};
class FlagDependencyExportsPlugin {
apply(compiler) {
compiler.hooks.compilation.tap(
"FlagDependencyExportsPlugin",
compilation => {
compilation.hooks.finishModules.tap(
"FlagDependencyExportsPlugin",
modules => {
const dependencies = new Map();
const queue = new Queue();
let module;
let moduleWithExports;
let moduleProvidedExports;
const processDependenciesBlock = depBlock => {
for (const dep of depBlock.dependencies) {
if (processDependency(dep)) return true;
}
for (const variable of depBlock.variables) {
for (const dep of variable.dependencies) {
if (processDependency(dep)) return true;
}
}
for (const block of depBlock.blocks) {
if (processDependenciesBlock(block)) return true;
}
return false;
};
const processDependency = dep => {
const exportDesc = dep.getExports && dep.getExports();
if (!exportDesc) return;
moduleWithExports = true;
const exports = exportDesc.exports;
// break early if it's only in the worst state
if (module.buildMeta.providedExports === true) {
return true;
}
// break if it should move to the worst state
if (exports === true) {
module.buildMeta.providedExports = true;
notifyDependencies();
return true;
}
// merge in new exports
if (Array.isArray(exports)) {
if (addToSet(moduleProvidedExports, exports)) {
notifyDependencies();
}
}
// store dependencies
const exportDeps = exportDesc.dependencies;
if (exportDeps) {
for (const exportDependency of exportDeps) {
// add dependency for this module
const set = dependencies.get(exportDependency);
if (set === undefined) {
dependencies.set(exportDependency, new Set([module]));
} else {
set.add(module);
}
}
}
return false;
};
const notifyDependencies = () => {
const deps = dependencies.get(module);
if (deps !== undefined) {
for (const dep of deps) {
queue.enqueue(dep);
}
}
};
// Start with all modules without provided exports
for (const module of modules) {
if (!module.buildMeta.providedExports) {
queue.enqueue(module);
}
}
while (queue.length > 0) {
module = queue.dequeue();
if (module.buildMeta.providedExports !== true) {
moduleWithExports =
module.buildMeta && module.buildMeta.exportsType;
moduleProvidedExports = Array.isArray(
module.buildMeta.providedExports
)
? new Set(module.buildMeta.providedExports)
: new Set();
processDependenciesBlock(module);
if (!moduleWithExports) {
module.buildMeta.providedExports = true;
notifyDependencies();
} else if (module.buildMeta.providedExports !== true) {
module.buildMeta.providedExports = Array.from(
moduleProvidedExports
);
}
}
}
}
);
const providedExportsCache = new WeakMap();
compilation.hooks.rebuildModule.tap(
"FlagDependencyExportsPlugin",
module => {
providedExportsCache.set(module, module.buildMeta.providedExports);
}
);
compilation.hooks.finishRebuildingModule.tap(
"FlagDependencyExportsPlugin",
module => {
module.buildMeta.providedExports = providedExportsCache.get(module);
}
);
}
);
}
}
module.exports = FlagDependencyExportsPlugin;
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