vue hello world项目
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Florent Cailhol @ooflorent
*/
"use strict";
const { ConcatSource } = require("webpack-sources");
const makeSerializable = require("./util/makeSerializable");
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("./Generator").GenerateContext} GenerateContext */
/**
* @param {InitFragment} fragment the init fragment
* @param {number} index index
* @returns {[InitFragment, number]} tuple with both
*/
const extractFragmentIndex = (fragment, index) => [fragment, index];
/**
* @param {[InitFragment, number]} a first pair
* @param {[InitFragment, number]} b second pair
* @returns {number} sort value
*/
const sortFragmentWithIndex = ([a, i], [b, j]) => {
const stageCmp = a.stage - b.stage;
if (stageCmp !== 0) return stageCmp;
const positionCmp = a.position - b.position;
if (positionCmp !== 0) return positionCmp;
return i - j;
};
/**
* @template Context
*/
class InitFragment {
/**
* @param {string|Source} content the source code that will be included as initialization code
* @param {number} stage category of initialization code (contribute to order)
* @param {number} position position in the category (contribute to order)
* @param {string=} key unique key to avoid emitting the same initialization code twice
* @param {string|Source=} endContent the source code that will be included at the end of the module
*/
constructor(content, stage, position, key, endContent) {
this.content = content;
this.stage = stage;
this.position = position;
this.key = key;
this.endContent = endContent;
}
/**
* @param {Context} context context
* @returns {string|Source} the source code that will be included as initialization code
*/
getContent(context) {
return this.content;
}
/**
* @param {Context} context context
* @returns {string|Source=} the source code that will be included at the end of the module
*/
getEndContent(context) {
return this.endContent;
}
static addToSource(source, initFragments, context) {
if (initFragments.length > 0) {
// Sort fragments by position. If 2 fragments have the same position,
// use their index.
const sortedFragments = initFragments
.map(extractFragmentIndex)
.sort(sortFragmentWithIndex);
// Deduplicate fragments. If a fragment has no key, it is always included.
const keyedFragments = new Map();
for (const [fragment] of sortedFragments) {
if (typeof fragment.mergeAll === "function") {
if (!fragment.key) {
throw new Error(
`InitFragment with mergeAll function must have a valid key: ${fragment.constructor.name}`
);
}
const oldValue = keyedFragments.get(fragment.key);
if (oldValue === undefined) {
keyedFragments.set(fragment.key, fragment);
} else if (Array.isArray(oldValue)) {
oldValue.push(fragment);
} else {
keyedFragments.set(fragment.key, [oldValue, fragment]);
}
continue;
} else if (typeof fragment.merge === "function") {
const oldValue = keyedFragments.get(fragment.key);
if (oldValue !== undefined) {
keyedFragments.set(fragment.key, fragment.merge(oldValue));
continue;
}
}
keyedFragments.set(fragment.key || Symbol(), fragment);
}
const concatSource = new ConcatSource();
const endContents = [];
for (let fragment of keyedFragments.values()) {
if (Array.isArray(fragment)) {
fragment = fragment[0].mergeAll(fragment);
}
concatSource.add(fragment.getContent(context));
const endContent = fragment.getEndContent(context);
if (endContent) {
endContents.push(endContent);
}
}
concatSource.add(source);
for (const content of endContents.reverse()) {
concatSource.add(content);
}
return concatSource;
} else {
return source;
}
}
serialize(context) {
const { write } = context;
write(this.content);
write(this.stage);
write(this.position);
write(this.key);
write(this.endContent);
}
deserialize(context) {
const { read } = context;
this.content = read();
this.stage = read();
this.position = read();
this.key = read();
this.endContent = read();
}
}
makeSerializable(InitFragment, "webpack/lib/InitFragment");
InitFragment.prototype.merge = undefined;
InitFragment.STAGE_CONSTANTS = 10;
InitFragment.STAGE_ASYNC_BOUNDARY = 20;
InitFragment.STAGE_HARMONY_EXPORTS = 30;
InitFragment.STAGE_HARMONY_IMPORTS = 40;
InitFragment.STAGE_PROVIDES = 50;
InitFragment.STAGE_ASYNC_DEPENDENCIES = 60;
InitFragment.STAGE_ASYNC_HARMONY_IMPORTS = 70;
module.exports = InitFragment;