angular-cn/tools/broccoli/diffing-broccoli-plugin.ts

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/// <reference path="broccoli.d.ts" />
/// <reference path="../typings/fs-extra/fs-extra.d.ts" />
/// <reference path="../typings/node/node.d.ts" />
import fs = require('fs');
import fse = require('fs-extra');
import path = require('path');
import {TreeDiffer, DiffResult} from './tree-differ';
import stabilizeTree from './broccoli-tree-stabilizer';
let symlinkOrCopy = require('symlink-or-copy');
export {DiffResult} from './tree-differ';
/**
* Makes writing diffing plugins easy.
*
* Factory method that takes a class that implements the DiffingBroccoliPlugin interface and returns
* an instance of BroccoliTree.
*
* @param pluginClass
* @returns {DiffingPlugin}
*/
export function wrapDiffingPlugin(pluginClass): DiffingPluginWrapperFactory {
return function() { return new DiffingPluginWrapper(pluginClass, arguments); };
}
export interface DiffingBroccoliPlugin {
rebuild(diff: (DiffResult | DiffResult[])): (Promise<DiffResult | void>| DiffResult | void);
cleanup ? () : void;
}
type DiffingPluginWrapperFactory = (inputTrees: (BroccoliTree | BroccoliTree[]), options?) =>
BroccoliTree;
class DiffingPluginWrapper implements BroccoliTree {
treeDiffer: TreeDiffer = null;
treeDiffers: TreeDiffer[] = null;
initialized = false;
wrappedPlugin: DiffingBroccoliPlugin = null;
inputTree = null;
inputTrees = null;
description = null;
// props monkey-patched by broccoli builder:
inputPath = null;
inputPaths = null;
cachePath = null;
outputPath = null;
private diffResult: DiffResult = null;
constructor(private pluginClass, private wrappedPluginArguments) {
if (Array.isArray(wrappedPluginArguments[0])) {
this.inputTrees = this.stabilizeTrees(wrappedPluginArguments[0]);
} else {
this.inputTree = this.stabilizeTree(wrappedPluginArguments[0]);
}
this.description = this.pluginClass.name;
}
private getDiffResult(): (DiffResult | DiffResult[]) {
let returnOrCalculateDiffResult = (tree, index) => {
// returnOrCalculateDiffResult will do one of two things:
//
// If `this.diffResult` is null, calculate a DiffResult using TreeDiffer
// for the input tree.
//
// Otherwise, `this.diffResult` was produced from the output of the
// inputTree's rebuild() method, and can be used without being checked.
// Set `this.diffResult` to null and return the previously stored value.
let diffResult = tree.diffResult;
if (diffResult) return diffResult;
let differ = index === false ? this.treeDiffer : this.treeDiffers[index];
return differ.diffTree();
};
if (this.inputTrees) {
return this.inputTrees.map(returnOrCalculateDiffResult);
} else if (this.inputTree) {
return returnOrCalculateDiffResult(this.inputTree, false);
} else {
throw new Error("Missing TreeDiffer");
}
}
private maybeStoreDiffResult(value: (DiffResult | void)) {
if (!(value instanceof DiffResult)) value = null;
this.diffResult = <DiffResult>(value);
}
rebuild(): (Promise<any>| void) {
try {
let firstRun = !this.initialized;
this.init();
let diffResult = this.getDiffResult();
let result = this.wrappedPlugin.rebuild(diffResult);
if (result) {
let resultPromise = <Promise<DiffResult | void>>(result);
if (resultPromise.then) {
// rebuild() -> Promise<>
return resultPromise.then((result: (DiffResult | void)) => {
this.maybeStoreDiffResult(result);
this.relinkOutputAndCachePaths();
});
}
}
this.maybeStoreDiffResult(<(DiffResult | void)>(result));
this.relinkOutputAndCachePaths();
} catch (e) {
e.message = `[${this.description}]: ${e.message}`;
throw e;
}
}
cleanup() {
if (this.wrappedPlugin.cleanup) {
this.wrappedPlugin.cleanup();
}
}
private relinkOutputAndCachePaths() {
// just symlink the cache and output tree
fs.rmdirSync(this.outputPath);
symlinkOrCopy.sync(this.cachePath, this.outputPath);
}
private init() {
if (!this.initialized) {
let includeExtensions = this.pluginClass.includeExtensions || [];
let excludeExtensions = this.pluginClass.excludeExtensions || [];
let description = this.description;
this.initialized = true;
if (this.inputPaths) {
this.treeDiffers =
this.inputPaths.map((inputPath) => new TreeDiffer(
description, inputPath, includeExtensions, excludeExtensions));
} else if (this.inputPath) {
this.treeDiffer =
new TreeDiffer(description, this.inputPath, includeExtensions, excludeExtensions);
}
this.wrappedPlugin = new this.pluginClass(this.inputPaths || this.inputPath, this.cachePath,
this.wrappedPluginArguments[1]);
}
}
private stabilizeTrees(trees: BroccoliTree[]) {
// Prevent extensions to prevent array from being mutated from the outside.
// For-loop used to avoid re-allocating a new array.
for (let i = 0; i < trees.length; ++i) {
trees[i] = this.stabilizeTree(trees[i]);
}
return Object.freeze(trees);
}
private stabilizeTree(tree: BroccoliTree) {
// Ignore all DiffingPlugins as they are already stable, for others we don't know for sure
// so we need to stabilize them.
// Since it's not safe to use instanceof operator in node, we are checking the constructor.name.
//
// New-styler/rebuild trees should always be stable.
let isNewStyleTree = !!(tree['newStyleTree'] || typeof tree.rebuild === 'function' ||
tree['isReadAPICompatTree'] || tree.constructor['name'] === 'Funnel');
return isNewStyleTree ? tree : stabilizeTree(tree);
}
}