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7e20285e70
The -*- file variable lines -*- establish per-file settings that Emacs will pick up. This patch makes the following changes to those lines (and touches nothing else): - Never set the buffer's mode. Years ago, Emacs did not have a good JavaScript mode, so it made sense to use Java or C++ mode in .js files. However, Emacs has had js-mode for years now; it's perfectly serviceable, and is available and enabled by default in all major Emacs packagings. Selecting a mode in the -*- file variable line -*- is almost always the wrong thing to do anyway. It overrides Emacs's default choice, which is (now) reasonable; and even worse, it overrides settings the user might have made in their '.emacs' file for that file extension. It's only useful when there's something specific about that particular file that makes a particular mode appropriate. - Correctly propagate settings that establish the correct indentation level for this file: c-basic-offset and js2-basic-offset should be js-indent-level. Whatever value they're given should be preserved; different parts of our tree use different indentation styles. - We don't use tabs in Mozilla JS code. Always set indent-tabs-mode: nil. Remove tab-width: settings, at least in files that don't contain tab characters. - Remove js2-mode settings that belong in the user's .emacs file, like js2-skip-preprocessor-directives.
867 lines
24 KiB
JavaScript
867 lines
24 KiB
JavaScript
/* -*- indent-tabs-mode: nil; js-indent-level: 2; fill-column: 80 -*- */
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/*
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* Copyright 2013 Mozilla Foundation and contributors
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* Licensed under the New BSD license. See LICENSE.md or:
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* http://opensource.org/licenses/BSD-2-Clause
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*/
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(function (root, factory) {
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if (typeof define === 'function' && define.amd) {
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define(factory);
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} else if (typeof exports === 'object') {
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module.exports = factory();
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} else {
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root.prettyFast = factory();
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}
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}(this, function () {
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"use strict";
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var acorn = this.acorn || require("acorn/acorn");
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var sourceMap = this.sourceMap || require("source-map");
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var SourceNode = sourceMap.SourceNode;
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// If any of these tokens are seen before a "[" token, we know that "[" token
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// is the start of an array literal, rather than a property access.
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//
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// The only exception is "}", which would need to be disambiguated by
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// parsing. The majority of the time, an open bracket following a closing
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// curly is going to be an array literal, so we brush the complication under
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// the rug, and handle the ambiguity by always assuming that it will be an
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// array literal.
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var PRE_ARRAY_LITERAL_TOKENS = {
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"typeof": true,
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"void": true,
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"delete": true,
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"case": true,
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"do": true,
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"=": true,
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"in": true,
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"{": true,
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"*": true,
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"/": true,
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"%": true,
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"else": true,
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";": true,
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"++": true,
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"--": true,
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"+": true,
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"-": true,
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"~": true,
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"!": true,
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":": true,
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"?": true,
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">>": true,
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">>>": true,
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"<<": true,
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"||": true,
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"&&": true,
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"<": true,
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">": true,
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"<=": true,
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">=": true,
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"instanceof": true,
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"&": true,
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"^": true,
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"|": true,
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"==": true,
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"!=": true,
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"===": true,
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"!==": true,
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",": true,
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"}": true
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};
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/**
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* Determines if we think that the given token starts an array literal.
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*
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* @param Object token
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* The token we want to determine if it is an array literal.
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* @param Object lastToken
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* The last token we added to the pretty printed results.
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*
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* @returns Boolean
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* True if we believe it is an array literal, false otherwise.
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*/
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function isArrayLiteral(token, lastToken) {
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if (token.type.type != "[") {
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return false;
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}
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if (!lastToken) {
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return true;
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}
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if (lastToken.type.isAssign) {
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return true;
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}
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return !!PRE_ARRAY_LITERAL_TOKENS[lastToken.type.keyword || lastToken.type.type];
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}
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// If any of these tokens are followed by a token on a new line, we know that
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// ASI cannot happen.
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var PREVENT_ASI_AFTER_TOKENS = {
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// Binary operators
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"*": true,
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"/": true,
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"%": true,
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"+": true,
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"-": true,
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"<<": true,
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">>": true,
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">>>": true,
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"<": true,
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">": true,
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"<=": true,
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">=": true,
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"instanceof": true,
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"in": true,
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"==": true,
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"!=": true,
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"===": true,
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"!==": true,
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"&": true,
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"^": true,
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"|": true,
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"&&": true,
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"||": true,
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",": true,
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".": true,
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"=": true,
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"*=": true,
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"/=": true,
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"%=": true,
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"+=": true,
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"-=": true,
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"<<=": true,
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">>=": true,
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">>>=": true,
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"&=": true,
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"^=": true,
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"|=": true,
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// Unary operators
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"delete": true,
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"void": true,
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"typeof": true,
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"~": true,
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"!": true,
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"new": true,
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// Function calls and grouped expressions
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"(": true
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};
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// If any of these tokens are on a line after the token before it, we know
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// that ASI cannot happen.
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var PREVENT_ASI_BEFORE_TOKENS = {
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// Binary operators
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"*": true,
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"/": true,
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"%": true,
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"<<": true,
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">>": true,
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">>>": true,
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"<": true,
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">": true,
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"<=": true,
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">=": true,
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"instanceof": true,
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"in": true,
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"==": true,
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"!=": true,
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"===": true,
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"!==": true,
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"&": true,
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"^": true,
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"|": true,
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"&&": true,
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"||": true,
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",": true,
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".": true,
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"=": true,
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"*=": true,
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"/=": true,
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"%=": true,
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"+=": true,
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"-=": true,
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"<<=": true,
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">>=": true,
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">>>=": true,
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"&=": true,
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"^=": true,
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"|=": true,
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// Function calls
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"(": true
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};
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/**
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* Determines if Automatic Semicolon Insertion (ASI) occurs between these
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* tokens.
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*
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* @param Object token
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* The current token.
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* @param Object lastToken
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* The last token we added to the pretty printed results.
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*
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* @returns Boolean
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* True if we believe ASI occurs.
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*/
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function isASI(token, lastToken) {
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if (!lastToken) {
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return false;
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}
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if (token.startLoc.line === lastToken.startLoc.line) {
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return false;
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}
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if (PREVENT_ASI_AFTER_TOKENS[lastToken.type.type || lastToken.type.keyword]) {
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return false;
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}
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if (PREVENT_ASI_BEFORE_TOKENS[token.type.type || token.type.keyword]) {
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return false;
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}
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return true;
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}
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/**
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* Determine if we have encountered a getter or setter.
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*
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* @param Object token
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* The current token. If this is a getter or setter, it would be the
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* property name.
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* @param Object lastToken
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* The last token we added to the pretty printed results. If this is a
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* getter or setter, it would be the `get` or `set` keyword
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* respectively.
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* @param Array stack
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* The stack of open parens/curlies/brackets/etc.
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*
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* @returns Boolean
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* True if this is a getter or setter.
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*/
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function isGetterOrSetter(token, lastToken, stack) {
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return stack[stack.length - 1] == "{"
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&& lastToken
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&& lastToken.type.type == "name"
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&& (lastToken.value == "get" || lastToken.value == "set")
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&& token.type.type == "name";
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}
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/**
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* Determine if we should add a newline after the given token.
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*
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* @param Object token
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* The token we are looking at.
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* @param Array stack
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* The stack of open parens/curlies/brackets/etc.
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*
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* @returns Boolean
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* True if we should add a newline.
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*/
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function isLineDelimiter(token, stack) {
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if (token.isArrayLiteral) {
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return true;
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}
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var ttt = token.type.type;
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var top = stack[stack.length - 1];
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return ttt == ";" && top != "("
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|| ttt == "{"
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|| ttt == "," && top != "("
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|| ttt == ":" && (top == "case" || top == "default");
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}
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/**
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* Append the necessary whitespace to the result after we have added the given
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* token.
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*
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* @param Object token
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* The token that was just added to the result.
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* @param Function write
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* The function to write to the pretty printed results.
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* @param Array stack
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* The stack of open parens/curlies/brackets/etc.
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*
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* @returns Boolean
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* Returns true if we added a newline to result, false in all other
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* cases.
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*/
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function appendNewline(token, write, stack) {
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if (isLineDelimiter(token, stack)) {
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write("\n", token.startLoc.line, token.startLoc.column);
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return true;
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}
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return false;
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}
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/**
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* Determines if we need to add a space between the last token we added and
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* the token we are about to add.
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*
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* @param Object token
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* The token we are about to add to the pretty printed code.
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* @param Object lastToken
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* The last token added to the pretty printed code.
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*/
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function needsSpaceAfter(token, lastToken) {
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if (lastToken) {
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if (lastToken.type.isLoop) {
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return true;
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}
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if (lastToken.type.isAssign) {
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return true;
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}
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if (lastToken.type.binop != null) {
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return true;
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}
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var ltt = lastToken.type.type;
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if (ltt == "?") {
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return true;
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}
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if (ltt == ":") {
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return true;
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}
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if (ltt == ",") {
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return true;
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}
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if (ltt == ";") {
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return true;
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}
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var ltk = lastToken.type.keyword;
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if (ltk != null) {
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if (ltk == "break" || ltk == "continue" || ltk == "return") {
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return token.type.type != ";";
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}
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if (ltk != "debugger"
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&& ltk != "null"
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&& ltk != "true"
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&& ltk != "false"
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&& ltk != "this"
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&& ltk != "default") {
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return true;
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}
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}
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if (ltt == ")" && (token.type.type != ")"
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&& token.type.type != "]"
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&& token.type.type != ";"
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&& token.type.type != ","
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&& token.type.type != ".")) {
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return true;
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}
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}
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if (token.type.isAssign) {
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return true;
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}
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if (token.type.binop != null) {
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return true;
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}
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if (token.type.type == "?") {
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return true;
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}
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return false;
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}
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/**
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* Add the required whitespace before this token, whether that is a single
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* space, newline, and/or the indent on fresh lines.
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*
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* @param Object token
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* The token we are about to add to the pretty printed code.
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* @param Object lastToken
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* The last token we added to the pretty printed code.
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* @param Boolean addedNewline
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* Whether we added a newline after adding the last token to the pretty
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* printed code.
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* @param Function write
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* The function to write pretty printed code to the result SourceNode.
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* @param Object options
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* The options object.
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* @param Number indentLevel
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* The number of indents deep we are.
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* @param Array stack
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* The stack of open curlies, brackets, etc.
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*/
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function prependWhiteSpace(token, lastToken, addedNewline, write, options,
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indentLevel, stack) {
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var ttk = token.type.keyword;
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var ttt = token.type.type;
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var newlineAdded = addedNewline;
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var ltt = lastToken ? lastToken.type.type : null;
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// Handle whitespace and newlines after "}" here instead of in
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// `isLineDelimiter` because it is only a line delimiter some of the
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// time. For example, we don't want to put "else if" on a new line after
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// the first if's block.
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if (lastToken && ltt == "}") {
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if (ttk == "while" && stack[stack.length - 1] == "do") {
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write(" ",
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lastToken.startLoc.line,
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lastToken.startLoc.column);
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} else if (ttk == "else" ||
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ttk == "catch" ||
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ttk == "finally") {
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write(" ",
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lastToken.startLoc.line,
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lastToken.startLoc.column);
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} else if (ttt != "(" &&
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ttt != ";" &&
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ttt != "," &&
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ttt != ")" &&
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ttt != ".") {
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write("\n",
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lastToken.startLoc.line,
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lastToken.startLoc.column);
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newlineAdded = true;
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}
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}
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if (isGetterOrSetter(token, lastToken, stack)) {
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write(" ",
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lastToken.startLoc.line,
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lastToken.startLoc.column);
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}
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if (ttt == ":" && stack[stack.length - 1] == "?") {
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write(" ",
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lastToken.startLoc.line,
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lastToken.startLoc.column);
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}
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if (lastToken && ltt != "}" && ttk == "else") {
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write(" ",
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lastToken.startLoc.line,
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lastToken.startLoc.column);
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}
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function ensureNewline() {
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if (!newlineAdded) {
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write("\n",
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lastToken.startLoc.line,
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lastToken.startLoc.column);
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newlineAdded = true;
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}
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}
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if (isASI(token, lastToken)) {
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ensureNewline();
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}
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if (decrementsIndent(ttt, stack)) {
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ensureNewline();
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}
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if (newlineAdded) {
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if (ttk == "case" || ttk == "default") {
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write(repeat(options.indent, indentLevel - 1),
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token.startLoc.line,
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token.startLoc.column);
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} else {
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write(repeat(options.indent, indentLevel),
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token.startLoc.line,
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token.startLoc.column);
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}
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} else if (needsSpaceAfter(token, lastToken)) {
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write(" ",
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lastToken.startLoc.line,
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lastToken.startLoc.column);
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}
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}
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|
/**
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|
* Repeat the `str` string `n` times.
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*
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|
* @param String str
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* The string to be repeated.
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|
* @param Number n
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* The number of times to repeat the string.
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*
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* @returns String
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* The repeated string.
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*/
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function repeat(str, n) {
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var result = "";
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while (n > 0) {
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|
if (n & 1) {
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result += str;
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}
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n >>= 1;
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str += str;
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}
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return result;
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}
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|
|
|
/**
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|
* Make sure that we output the escaped character combination inside string literals
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|
* instead of various problematic characters.
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|
*/
|
|
var sanitize = (function () {
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|
var escapeCharacters = {
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|
// Backslash
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"\\": "\\\\",
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|
// Newlines
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|
"\n": "\\n",
|
|
// Carriage return
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|
"\r": "\\r",
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|
// Tab
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|
"\t": "\\t",
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|
// Vertical tab
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|
"\v": "\\v",
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|
// Form feed
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|
"\f": "\\f",
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|
// Null character
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|
"\0": "\\0",
|
|
// Single quotes
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|
"'": "\\'"
|
|
};
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|
|
|
var regExpString = "("
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|
+ Object.keys(escapeCharacters)
|
|
.map(function (c) { return escapeCharacters[c]; })
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|
.join("|")
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|
+ ")";
|
|
var escapeCharactersRegExp = new RegExp(regExpString, "g");
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|
|
|
return function(str) {
|
|
return str.replace(escapeCharactersRegExp, function (_, c) {
|
|
return escapeCharacters[c];
|
|
});
|
|
}
|
|
}());
|
|
/**
|
|
* Add the given token to the pretty printed results.
|
|
*
|
|
* @param Object token
|
|
* The token to add.
|
|
* @param Function write
|
|
* The function to write pretty printed code to the result SourceNode.
|
|
* @param Object options
|
|
* The options object.
|
|
*/
|
|
function addToken(token, write, options) {
|
|
if (token.type.type == "string") {
|
|
write("'" + sanitize(token.value) + "'",
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|
token.startLoc.line,
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|
token.startLoc.column);
|
|
} else {
|
|
write(String(token.value != null ? token.value : token.type.type),
|
|
token.startLoc.line,
|
|
token.startLoc.column);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns true if the given token type belongs on the stack.
|
|
*/
|
|
function belongsOnStack(token) {
|
|
var ttt = token.type.type;
|
|
var ttk = token.type.keyword;
|
|
return ttt == "{"
|
|
|| ttt == "("
|
|
|| ttt == "["
|
|
|| ttt == "?"
|
|
|| ttk == "do"
|
|
|| ttk == "switch"
|
|
|| ttk == "case"
|
|
|| ttk == "default";
|
|
}
|
|
|
|
/**
|
|
* Returns true if the given token should cause us to pop the stack.
|
|
*/
|
|
function shouldStackPop(token, stack) {
|
|
var ttt = token.type.type;
|
|
var ttk = token.type.keyword;
|
|
var top = stack[stack.length - 1];
|
|
return ttt == "]"
|
|
|| ttt == ")"
|
|
|| ttt == "}"
|
|
|| (ttt == ":" && (top == "case" || top == "default" || top == "?"))
|
|
|| (ttk == "while" && top == "do");
|
|
}
|
|
|
|
/**
|
|
* Returns true if the given token type should cause us to decrement the
|
|
* indent level.
|
|
*/
|
|
function decrementsIndent(tokenType, stack) {
|
|
return tokenType == "}"
|
|
|| (tokenType == "]" && stack[stack.length - 1] == "[\n")
|
|
}
|
|
|
|
/**
|
|
* Returns true if the given token should cause us to increment the indent
|
|
* level.
|
|
*/
|
|
function incrementsIndent(token) {
|
|
return token.type.type == "{"
|
|
|| token.isArrayLiteral
|
|
|| token.type.keyword == "switch";
|
|
}
|
|
|
|
/**
|
|
* Add a comment to the pretty printed code.
|
|
*
|
|
* @param Function write
|
|
* The function to write pretty printed code to the result SourceNode.
|
|
* @param Number indentLevel
|
|
* The number of indents deep we are.
|
|
* @param Object options
|
|
* The options object.
|
|
* @param Boolean block
|
|
* True if the comment is a multiline block style comment.
|
|
* @param String text
|
|
* The text of the comment.
|
|
* @param Number line
|
|
* The line number to comment appeared on.
|
|
* @param Number column
|
|
* The column number the comment appeared on.
|
|
*/
|
|
function addComment(write, indentLevel, options, block, text, line, column) {
|
|
var indentString = repeat(options.indent, indentLevel);
|
|
|
|
write(indentString, line, column);
|
|
if (block) {
|
|
write("/*");
|
|
write(text
|
|
.split(new RegExp("/\n" + indentString + "/", "g"))
|
|
.join("\n" + indentString));
|
|
write("*/");
|
|
} else {
|
|
write("//");
|
|
write(text);
|
|
}
|
|
write("\n");
|
|
}
|
|
|
|
/**
|
|
* The main function.
|
|
*
|
|
* @param String input
|
|
* The ugly JS code we want to pretty print.
|
|
* @param Object options
|
|
* The options object. Provides configurability of the pretty
|
|
* printing. Properties:
|
|
* - url: The URL string of the ugly JS code.
|
|
* - indent: The string to indent code by.
|
|
*
|
|
* @returns Object
|
|
* An object with the following properties:
|
|
* - code: The pretty printed code string.
|
|
* - map: A SourceMapGenerator instance.
|
|
*/
|
|
return function prettyFast(input, options) {
|
|
// The level of indents deep we are.
|
|
var indentLevel = 0;
|
|
|
|
// We will accumulate the pretty printed code in this SourceNode.
|
|
var result = new SourceNode();
|
|
|
|
/**
|
|
* Write a pretty printed string to the result SourceNode.
|
|
*
|
|
* We buffer our writes so that we only create one mapping for each line in
|
|
* the source map. This enhances performance by avoiding extraneous mapping
|
|
* serialization, and flattening the tree that
|
|
* `SourceNode#toStringWithSourceMap` will have to recursively walk. When
|
|
* timing how long it takes to pretty print jQuery, this optimization
|
|
* brought the time down from ~390 ms to ~190ms!
|
|
*
|
|
* @param String str
|
|
* The string to be added to the result.
|
|
* @param Number line
|
|
* The line number the string came from in the ugly source.
|
|
* @param Number column
|
|
* The column number the string came from in the ugly source.
|
|
*/
|
|
var write = (function () {
|
|
var buffer = [];
|
|
var bufferLine = -1;
|
|
var bufferColumn = -1;
|
|
return function write(str, line, column) {
|
|
if (line != null && bufferLine === -1) {
|
|
bufferLine = line;
|
|
}
|
|
if (column != null && bufferColumn === -1) {
|
|
bufferColumn = column;
|
|
}
|
|
buffer.push(str);
|
|
|
|
if (str == "\n") {
|
|
var lineStr = "";
|
|
for (var i = 0, len = buffer.length; i < len; i++) {
|
|
lineStr += buffer[i];
|
|
}
|
|
result.add(new SourceNode(bufferLine, bufferColumn, options.url, lineStr));
|
|
buffer.splice(0, buffer.length);
|
|
bufferLine = -1;
|
|
bufferColumn = -1;
|
|
}
|
|
}
|
|
}());
|
|
|
|
// Whether or not we added a newline on after we added the last token.
|
|
var addedNewline = false;
|
|
|
|
// The current token we will be adding to the pretty printed code.
|
|
var token;
|
|
|
|
// Shorthand for token.type.type, so we don't have to repeatedly access
|
|
// properties.
|
|
var ttt;
|
|
|
|
// Shorthand for token.type.keyword, so we don't have to repeatedly access
|
|
// properties.
|
|
var ttk;
|
|
|
|
// The last token we added to the pretty printed code.
|
|
var lastToken;
|
|
|
|
// Stack of token types/keywords that can affect whether we want to add a
|
|
// newline or a space. We can make that decision based on what token type is
|
|
// on the top of the stack. For example, a comma in a parameter list should
|
|
// be followed by a space, while a comma in an object literal should be
|
|
// followed by a newline.
|
|
//
|
|
// Strings that go on the stack:
|
|
//
|
|
// - "{"
|
|
// - "("
|
|
// - "["
|
|
// - "[\n"
|
|
// - "do"
|
|
// - "?"
|
|
// - "switch"
|
|
// - "case"
|
|
// - "default"
|
|
//
|
|
// The difference between "[" and "[\n" is that "[\n" is used when we are
|
|
// treating "[" and "]" tokens as line delimiters and should increment and
|
|
// decrement the indent level when we find them.
|
|
var stack = [];
|
|
|
|
// Acorn's tokenizer will always yield comments *before* the token they
|
|
// follow (unless the very first thing in the source is a comment), so we
|
|
// have to queue the comments in order to pretty print them in the correct
|
|
// location. For example, the source file:
|
|
//
|
|
// foo
|
|
// // a
|
|
// // b
|
|
// bar
|
|
//
|
|
// When tokenized by acorn, gives us the following token stream:
|
|
//
|
|
// [ '// a', '// b', foo, bar ]
|
|
var commentQueue = [];
|
|
|
|
var getToken = acorn.tokenize(input, {
|
|
locations: true,
|
|
sourceFile: options.url,
|
|
onComment: function (block, text, start, end, startLoc, endLoc) {
|
|
if (lastToken) {
|
|
commentQueue.push({
|
|
block: block,
|
|
text: text,
|
|
line: startLoc.line,
|
|
column: startLoc.column,
|
|
trailing: lastToken.endLoc.line == startLoc.line
|
|
});
|
|
} else {
|
|
addComment(write, indentLevel, options, block, text, startLoc.line,
|
|
startLoc.column);
|
|
addedNewline = true;
|
|
}
|
|
}
|
|
});
|
|
|
|
while (true) {
|
|
token = getToken();
|
|
|
|
ttk = token.type.keyword;
|
|
ttt = token.type.type;
|
|
|
|
if (ttt == "eof") {
|
|
if (!addedNewline) {
|
|
write("\n");
|
|
}
|
|
break;
|
|
}
|
|
|
|
token.isArrayLiteral = isArrayLiteral(token, lastToken);
|
|
|
|
if (belongsOnStack(token)) {
|
|
if (token.isArrayLiteral) {
|
|
stack.push("[\n");
|
|
} else {
|
|
stack.push(ttt || ttk);
|
|
}
|
|
}
|
|
|
|
if (decrementsIndent(ttt, stack)) {
|
|
indentLevel--;
|
|
if (ttt == "}"
|
|
&& stack.length > 1
|
|
&& stack[stack.length - 2] == "switch") {
|
|
indentLevel--;
|
|
}
|
|
}
|
|
|
|
prependWhiteSpace(token, lastToken, addedNewline, write, options,
|
|
indentLevel, stack);
|
|
addToken(token, write, options);
|
|
if (commentQueue.length == 0 || !commentQueue[0].trailing) {
|
|
addedNewline = appendNewline(token, write, stack);
|
|
}
|
|
|
|
if (shouldStackPop(token, stack)) {
|
|
stack.pop();
|
|
if (token == "}" && stack.length
|
|
&& stack[stack.length - 1] == "switch") {
|
|
stack.pop();
|
|
}
|
|
}
|
|
|
|
if (incrementsIndent(token)) {
|
|
indentLevel++;
|
|
}
|
|
|
|
// Acorn's tokenizer re-uses tokens, so we have to copy the last token on
|
|
// every iteration. We follow acorn's lead here, and reuse the lastToken
|
|
// object the same way that acorn reuses the token object. This allows us
|
|
// to avoid allocations and minimize GC pauses.
|
|
if (!lastToken) {
|
|
lastToken = { startLoc: {}, endLoc: {} };
|
|
}
|
|
lastToken.start = token.start;
|
|
lastToken.end = token.end;
|
|
lastToken.startLoc.line = token.startLoc.line;
|
|
lastToken.startLoc.column = token.startLoc.column;
|
|
lastToken.endLoc.line = token.endLoc.line;
|
|
lastToken.endLoc.column = token.endLoc.column;
|
|
lastToken.type = token.type;
|
|
lastToken.value = token.value;
|
|
lastToken.isArrayLiteral = token.isArrayLiteral;
|
|
|
|
// Apply all the comments that have been queued up.
|
|
if (commentQueue.length) {
|
|
if (!addedNewline && !commentQueue[0].trailing) {
|
|
write("\n");
|
|
}
|
|
if (commentQueue[0].trailing) {
|
|
write(" ");
|
|
}
|
|
for (var i = 0, n = commentQueue.length; i < n; i++) {
|
|
var comment = commentQueue[i];
|
|
var commentIndentLevel = commentQueue[i].trailing ? 0 : indentLevel;
|
|
addComment(write, commentIndentLevel, options, comment.block,
|
|
comment.text, comment.line, comment.column);
|
|
}
|
|
addedNewline = true;
|
|
commentQueue.splice(0, commentQueue.length);
|
|
}
|
|
}
|
|
|
|
return result.toStringWithSourceMap({ file: options.url });
|
|
};
|
|
|
|
}.bind(this)));
|