forked from mirrors/gecko-dev
701560ca88
Differential Revision: https://phabricator.services.mozilla.com/D11893 --HG-- extra : moz-landing-system : lando
819 lines
24 KiB
JavaScript
819 lines
24 KiB
JavaScript
/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
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/* vim: set ft= javascript ts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const DevToolsUtils = require("devtools/shared/DevToolsUtils");
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if (!isWorker) {
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loader.lazyImporter(this, "Parser", "resource://devtools/shared/Parser.jsm");
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}
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// Provide an easy way to bail out of even attempting an autocompletion
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// if an object has way too many properties. Protects against large objects
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// with numeric values that wouldn't be tallied towards MAX_AUTOCOMPLETIONS.
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const MAX_AUTOCOMPLETE_ATTEMPTS = exports.MAX_AUTOCOMPLETE_ATTEMPTS = 100000;
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// Prevent iterating over too many properties during autocomplete suggestions.
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const MAX_AUTOCOMPLETIONS = exports.MAX_AUTOCOMPLETIONS = 1500;
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const STATE_NORMAL = Symbol("STATE_NORMAL");
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const STATE_QUOTE = Symbol("STATE_QUOTE");
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const STATE_DQUOTE = Symbol("STATE_DQUOTE");
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const STATE_TEMPLATE_LITERAL = Symbol("STATE_TEMPLATE_LITERAL");
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const OPEN_BODY = "{[(".split("");
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const CLOSE_BODY = "}])".split("");
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const OPEN_CLOSE_BODY = {
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"{": "}",
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"[": "]",
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"(": ")",
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};
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const NO_AUTOCOMPLETE_PREFIXES = ["var", "const", "let", "function", "class"];
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function hasArrayIndex(str) {
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return /\[\d+\]$/.test(str);
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}
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/**
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* Analyses a given string to find the last statement that is interesting for
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* later completion.
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*
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* @param string str
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* A string to analyse.
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*
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* @returns object
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* If there was an error in the string detected, then a object like
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*
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* { err: "ErrorMesssage" }
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*
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* is returned, otherwise a object like
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*
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* {
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* state: STATE_NORMAL|STATE_QUOTE|STATE_DQUOTE,
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* lastStatement: the last statement in the string,
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* isElementAccess: boolean that indicates if the lastStatement has an open
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* element access (e.g. `x["match`).
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* }
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*/
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function analyzeInputString(str) {
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const bodyStack = [];
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let state = STATE_NORMAL;
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let start = 0;
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let c;
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// Use an array in order to handle character with a length > 2 (e.g. 😎).
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const characters = Array.from(str);
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const buildReturnObject = () => {
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let isElementAccess = false;
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if (bodyStack.length === 1 && bodyStack[0].token === "[") {
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start = bodyStack[0].start;
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isElementAccess = true;
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if ([STATE_DQUOTE, STATE_QUOTE, STATE_TEMPLATE_LITERAL].includes(state)) {
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state = STATE_NORMAL;
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}
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}
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return {
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state,
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lastStatement: characters.slice(start).join(""),
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isElementAccess,
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};
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};
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for (let i = 0; i < characters.length; i++) {
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c = characters[i];
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switch (state) {
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// Normal JS state.
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case STATE_NORMAL:
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if (c == '"') {
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state = STATE_DQUOTE;
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} else if (c == "'") {
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state = STATE_QUOTE;
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} else if (c == "`") {
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state = STATE_TEMPLATE_LITERAL;
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} else if (";,:=<>+-*/%|&^~?!".split("").includes(c)) {
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// If the character is an operator, we need to update the start position.
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start = i + 1;
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} else if (c == " ") {
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const currentLastStatement = characters.slice(start, i).join("");
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const before = characters.slice(0, i);
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const after = characters.slice(i + 1);
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const trimmedBefore = Array.from(before.join("").trimRight());
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const trimmedAfter = Array.from(after.join("").trimLeft());
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const nextNonSpaceChar = trimmedAfter[0];
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const nextNonSpaceCharIndex = after.indexOf(nextNonSpaceChar);
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const previousNonSpaceChar = trimmedBefore[trimmedBefore.length - 1];
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// There's only spaces after that, so we can return.
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if (!nextNonSpaceChar) {
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return buildReturnObject();
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}
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// If the previous char in't a dot, and the next one isn't a dot either,
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// and the current computed statement is not a variable/function/class
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// declaration, update the start position.
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if (
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previousNonSpaceChar !== "." && nextNonSpaceChar !== "."
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&& !NO_AUTOCOMPLETE_PREFIXES.includes(currentLastStatement)
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) {
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start = i + nextNonSpaceCharIndex;
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}
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// Let's jump to handle the next non-space char.
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i = i + nextNonSpaceCharIndex;
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} else if (OPEN_BODY.includes(c)) {
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bodyStack.push({
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token: c,
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start,
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});
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start = i + 1;
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} else if (CLOSE_BODY.includes(c)) {
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const last = bodyStack.pop();
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if (!last || OPEN_CLOSE_BODY[last.token] != c) {
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return {
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err: "syntax error",
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};
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}
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if (c == "}") {
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start = i + 1;
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} else {
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start = last.start;
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}
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}
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break;
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// Double quote state > " <
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case STATE_DQUOTE:
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if (c == "\\") {
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i++;
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} else if (c == "\n") {
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return {
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err: "unterminated string literal",
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};
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} else if (c == '"') {
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state = STATE_NORMAL;
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}
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break;
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// Template literal state > ` <
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case STATE_TEMPLATE_LITERAL:
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if (c == "\\") {
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i++;
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} else if (c == "`") {
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state = STATE_NORMAL;
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}
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break;
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// Single quote state > ' <
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case STATE_QUOTE:
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if (c == "\\") {
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i++;
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} else if (c == "\n") {
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return {
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err: "unterminated string literal",
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};
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} else if (c == "'") {
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state = STATE_NORMAL;
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}
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break;
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}
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}
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return buildReturnObject();
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}
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/**
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* Provides a list of properties, that are possible matches based on the passed
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* Debugger.Environment/Debugger.Object and inputValue.
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*
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* @param {Object} An object of the following shape:
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* - {Object} dbgObject
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* When the debugger is not paused this Debugger.Object wraps
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* the scope for autocompletion.
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* It is null if the debugger is paused.
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* - {Object} environment
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* When the debugger is paused this Debugger.Environment is the
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* scope for autocompletion.
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* It is null if the debugger is not paused.
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* - {String} inputValue
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* Value that should be completed.
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* - {Number} cursor (defaults to inputValue.length).
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* Optional offset in the input where the cursor is located. If this is
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* omitted then the cursor is assumed to be at the end of the input
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* value.
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* - {Boolean} invokeUnsafeGetter (defaults to false).
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* Optional boolean to indicate if the function should execute unsafe getter
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* in order to retrieve its result's properties.
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* ⚠️ This should be set to true *ONLY* on user action as it may cause side-effects
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* in the content page ⚠️
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* - {WebconsoleActor} webconsoleActor
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* A reference to a webconsole actor which we can use to retrieve the last
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* evaluation result or create a debuggee value.
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* - {String}: selectedNodeActor
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* The actor id of the selected node in the inspector.
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* @returns null or object
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* If the inputValue is an unsafe getter and invokeUnsafeGetter is false, the
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* following form is returned:
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*
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* {
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* isUnsafeGetter: true,
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* getterName: {String} The name of the unsafe getter
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* }
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*
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* If no completion valued could be computed, and the input is not an unsafe
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* getter, null is returned.
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*
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* Otherwise an object with the following form is returned:
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* {
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* matches: Set<string>
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* matchProp: Last part of the inputValue that was used to find
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* the matches-strings.
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* isElementAccess: Boolean set to true if the evaluation is an element
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* access (e.g. `window["addEvent`).
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* }
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*/
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function JSPropertyProvider({
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dbgObject,
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environment,
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inputValue,
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cursor,
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invokeUnsafeGetter = false,
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webconsoleActor,
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selectedNodeActor,
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}) {
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if (cursor === undefined) {
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cursor = inputValue.length;
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}
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inputValue = inputValue.substring(0, cursor);
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// Analyse the inputValue and find the beginning of the last part that
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// should be completed.
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const {
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err,
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state,
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lastStatement,
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isElementAccess,
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} = analyzeInputString(inputValue);
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// There was an error analysing the string.
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if (err) {
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return null;
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}
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// If the current state is not STATE_NORMAL, then we are inside of an string
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// which means that no completion is possible.
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if (state != STATE_NORMAL) {
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return null;
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}
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// Don't complete on just an empty string.
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if (lastStatement.trim() == "") {
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return null;
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}
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if (NO_AUTOCOMPLETE_PREFIXES.some(prefix => lastStatement.startsWith(prefix + " "))) {
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return null;
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}
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const completionPart = lastStatement;
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const lastDotIndex = completionPart.lastIndexOf(".");
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const lastOpeningBracketIndex = isElementAccess ? completionPart.lastIndexOf("[") : -1;
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const lastCompletionCharIndex = Math.max(lastDotIndex, lastOpeningBracketIndex);
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const startQuoteRegex = /^('|"|`)/;
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// AST representation of the expression before the last access char (`.` or `[`).
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let astExpression;
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let matchProp = completionPart.slice(lastCompletionCharIndex + 1).trimLeft();
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// Catch literals like [1,2,3] or "foo" and return the matches from
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// their prototypes.
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// Don't run this is a worker, migrating to acorn should allow this
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// to run in a worker - Bug 1217198.
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if (!isWorker && lastCompletionCharIndex > 0) {
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const parser = new Parser();
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parser.logExceptions = false;
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const parsedExpression = completionPart.slice(0, lastCompletionCharIndex);
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const syntaxTree = parser.get(parsedExpression);
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const lastTree = syntaxTree.getLastSyntaxTree();
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const lastBody = lastTree && lastTree.AST.body[lastTree.AST.body.length - 1];
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// Finding the last expression since we've sliced up until the dot.
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// If there were parse errors this won't exist.
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if (lastBody) {
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astExpression = lastBody.expression;
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let matchingObject;
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if (astExpression.type === "ArrayExpression") {
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matchingObject = Array.prototype;
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} else if (
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astExpression.type === "Literal" &&
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typeof astExpression.value === "string"
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) {
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matchingObject = String.prototype;
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} else if (
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astExpression.type === "Literal" &&
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Number.isFinite(astExpression.value)
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) {
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// The parser rightfuly indicates that we have a number in some cases (e.g. `1.`),
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// but we don't want to return Number proto properties in that case since
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// the result would be invalid (i.e. `1.toFixed()` throws).
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// So if the expression value is an integer, it should not end with `{Number}.`
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// (but the following are fine: `1..`, `(1.).`).
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if (
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!Number.isInteger(astExpression.value) ||
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/\d[^\.]{0}\.$/.test(completionPart) === false
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) {
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matchingObject = Number.prototype;
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} else {
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return null;
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}
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}
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if (matchingObject) {
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let search = matchProp;
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let elementAccessQuote;
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if (isElementAccess && startQuoteRegex.test(matchProp)) {
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elementAccessQuote = matchProp[0];
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search = matchProp.replace(startQuoteRegex, "");
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}
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let props = getMatchedProps(matchingObject, search);
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if (isElementAccess) {
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props = wrapMatchesInQuotes(props, elementAccessQuote);
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}
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return {
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isElementAccess,
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matchProp,
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matches: props,
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};
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}
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}
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}
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// We are completing a variable / a property lookup.
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let properties = [];
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if (astExpression) {
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if (lastCompletionCharIndex > -1) {
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properties = getPropertiesFromAstExpression(astExpression);
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if (properties === null) {
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return null;
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}
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}
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} else {
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properties = completionPart.split(".");
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if (isElementAccess) {
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const lastPart = properties[properties.length - 1];
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const openBracketIndex = lastPart.lastIndexOf("[");
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matchProp = lastPart.substr(openBracketIndex + 1);
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properties[properties.length - 1] = lastPart.substring(0, openBracketIndex);
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} else {
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matchProp = properties.pop().trimLeft();
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}
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}
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let search = matchProp;
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let elementAccessQuote;
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if (isElementAccess && startQuoteRegex.test(search)) {
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elementAccessQuote = search[0];
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search = search.replace(startQuoteRegex, "");
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}
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let obj = dbgObject;
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// The first property must be found in the environment of the paused debugger
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// or of the global lexical scope.
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const env = environment || obj.asEnvironment();
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if (properties.length === 0) {
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return {
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isElementAccess,
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matchProp,
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matches: getMatchedPropsInEnvironment(env, search),
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};
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}
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const firstProp = properties.shift().trim();
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if (firstProp === "this") {
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// Special case for 'this' - try to get the Object from the Environment.
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// No problem if it throws, we will just not autocomplete.
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try {
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obj = env.object;
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} catch (e) {
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// Ignore.
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}
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} else if (firstProp === "$_" && webconsoleActor) {
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obj = webconsoleActor.getLastConsoleInputEvaluation();
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} else if (firstProp === "$0" && selectedNodeActor && webconsoleActor) {
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const actor = webconsoleActor.conn.getActor(selectedNodeActor);
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if (actor) {
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try {
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obj = webconsoleActor.makeDebuggeeValue(actor.rawNode);
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} catch (e) {
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// Ignore.
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}
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}
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} else if (hasArrayIndex(firstProp)) {
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obj = getArrayMemberProperty(null, env, firstProp);
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} else {
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obj = getVariableInEnvironment(env, firstProp);
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}
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if (!isObjectUsable(obj)) {
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return null;
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}
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// We get the rest of the properties recursively starting from the
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// Debugger.Object that wraps the first property
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for (let [index, prop] of properties.entries()) {
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if (typeof prop === "string") {
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prop = prop.trim();
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}
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if (prop === undefined || prop === null || prop === "") {
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return null;
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}
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if (!invokeUnsafeGetter && DevToolsUtils.isUnsafeGetter(obj, prop)) {
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// If the unsafe getter is not the last property access of the input, bail out as
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// things might get complex.
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if (index !== properties.length - 1) {
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return null;
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}
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// If we try to access an unsafe getter, return its name so we can consume that
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// on the frontend.
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return {
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isUnsafeGetter: true,
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getterName: prop,
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};
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}
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if (hasArrayIndex(prop)) {
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// The property to autocomplete is a member of array. For example
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// list[i][j]..[n]. Traverse the array to get the actual element.
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obj = getArrayMemberProperty(obj, null, prop);
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} else {
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obj = DevToolsUtils.getProperty(obj, prop, invokeUnsafeGetter);
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}
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if (!isObjectUsable(obj)) {
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return null;
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}
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}
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const prepareReturnedObject = matches => {
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if (isElementAccess) {
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// If it's an element access, we need to wrap properties in quotes (either the one
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// the user already typed, or `"`).
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matches = wrapMatchesInQuotes(matches, elementAccessQuote);
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}
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return {isElementAccess, matchProp, matches};
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};
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// If the final property is a primitive
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if (typeof obj != "object") {
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return prepareReturnedObject(getMatchedProps(obj, search));
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}
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return prepareReturnedObject(getMatchedPropsInDbgObject(obj, search));
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}
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/**
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|
* @param {Object} ast: An AST representing a property access (e.g. `foo.bar["baz"].x`)
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* @returns {Array|null} An array representing the property access
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* (e.g. ["foo", "bar", "baz", "x"]).
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*/
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function getPropertiesFromAstExpression(ast) {
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let result = [];
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if (!ast) {
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return result;
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}
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const {type, property, object, name} = ast;
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if (type === "ThisExpression") {
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result.unshift("this");
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} else if (type === "Identifier" && name) {
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result.unshift(name);
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} else if (type === "MemberExpression") {
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if (property) {
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if (property.type === "Identifier" && property.name) {
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result.unshift(property.name);
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} else if (property.type === "Literal") {
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result.unshift(property.value);
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}
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}
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if (object) {
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result = (getPropertiesFromAstExpression(object) || []).concat(result);
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}
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} else {
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return null;
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}
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return result;
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}
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|
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function wrapMatchesInQuotes(matches, quote = `"`) {
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return new Set([...matches].map(p =>
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`${quote}${p.replace(new RegExp(`${quote}`, "g"), `\\${quote}`)}${quote}`));
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}
|
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|
|
/**
|
|
* Get the array member of obj for the given prop. For example, given
|
|
* prop='list[0][1]' the element at [0][1] of obj.list is returned.
|
|
*
|
|
* @param object obj
|
|
* The object to operate on. Should be null if env is passed.
|
|
* @param object env
|
|
* The Environment to operate in. Should be null if obj is passed.
|
|
* @param string prop
|
|
* The property to return.
|
|
* @return null or Object
|
|
* Returns null if the property couldn't be located. Otherwise the array
|
|
* member identified by prop.
|
|
*/
|
|
function getArrayMemberProperty(obj, env, prop) {
|
|
// First get the array.
|
|
const propWithoutIndices = prop.substr(0, prop.indexOf("["));
|
|
|
|
if (env) {
|
|
obj = getVariableInEnvironment(env, propWithoutIndices);
|
|
} else {
|
|
obj = DevToolsUtils.getProperty(obj, propWithoutIndices);
|
|
}
|
|
|
|
if (!isObjectUsable(obj)) {
|
|
return null;
|
|
}
|
|
|
|
// Then traverse the list of indices to get the actual element.
|
|
let result;
|
|
const arrayIndicesRegex = /\[[^\]]*\]/g;
|
|
while ((result = arrayIndicesRegex.exec(prop)) !== null) {
|
|
const indexWithBrackets = result[0];
|
|
const indexAsText = indexWithBrackets.substr(1, indexWithBrackets.length - 2);
|
|
const index = parseInt(indexAsText, 10);
|
|
|
|
if (isNaN(index)) {
|
|
return null;
|
|
}
|
|
|
|
obj = DevToolsUtils.getProperty(obj, index);
|
|
|
|
if (!isObjectUsable(obj)) {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
return obj;
|
|
}
|
|
|
|
/**
|
|
* Check if the given Debugger.Object can be used for autocomplete.
|
|
*
|
|
* @param Debugger.Object object
|
|
* The Debugger.Object to check.
|
|
* @return boolean
|
|
* True if further inspection into the object is possible, or false
|
|
* otherwise.
|
|
*/
|
|
function isObjectUsable(object) {
|
|
if (object == null) {
|
|
return false;
|
|
}
|
|
|
|
if (typeof object == "object" && object.class == "DeadObject") {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @see getExactMatchImpl()
|
|
*/
|
|
function getVariableInEnvironment(environment, name) {
|
|
return getExactMatchImpl(environment, name, DebuggerEnvironmentSupport);
|
|
}
|
|
|
|
/**
|
|
* @see getMatchedPropsImpl()
|
|
*/
|
|
function getMatchedPropsInEnvironment(environment, match) {
|
|
return getMatchedPropsImpl(environment, match, DebuggerEnvironmentSupport);
|
|
}
|
|
|
|
/**
|
|
* @see getMatchedPropsImpl()
|
|
*/
|
|
function getMatchedPropsInDbgObject(dbgObject, match) {
|
|
return getMatchedPropsImpl(dbgObject, match, DebuggerObjectSupport);
|
|
}
|
|
|
|
/**
|
|
* @see getMatchedPropsImpl()
|
|
*/
|
|
function getMatchedProps(obj, match) {
|
|
if (typeof obj != "object") {
|
|
obj = obj.constructor.prototype;
|
|
}
|
|
return getMatchedPropsImpl(obj, match, JSObjectSupport);
|
|
}
|
|
|
|
/**
|
|
* Get all properties in the given object (and its parent prototype chain) that
|
|
* match a given prefix.
|
|
*
|
|
* @param {Mixed} obj
|
|
* Object whose properties we want to filter.
|
|
* @param {string} match
|
|
* Filter for properties that match this string.
|
|
* @returns {Set} List of matched properties.
|
|
*/
|
|
function getMatchedPropsImpl(obj, match, {chainIterator, getProperties}) {
|
|
const matches = new Set();
|
|
let numProps = 0;
|
|
|
|
const insensitiveMatching = match && match[0].toUpperCase() !== match[0];
|
|
const propertyMatches = prop => {
|
|
return insensitiveMatching
|
|
? prop.toLocaleLowerCase().startsWith(match.toLocaleLowerCase())
|
|
: prop.startsWith(match);
|
|
};
|
|
|
|
// We need to go up the prototype chain.
|
|
const iter = chainIterator(obj);
|
|
for (obj of iter) {
|
|
const props = getProperties(obj);
|
|
if (!props) {
|
|
continue;
|
|
}
|
|
numProps += props.length;
|
|
|
|
// If there are too many properties to event attempt autocompletion,
|
|
// or if we have already added the max number, then stop looping
|
|
// and return the partial set that has already been discovered.
|
|
if (numProps >= MAX_AUTOCOMPLETE_ATTEMPTS ||
|
|
matches.size >= MAX_AUTOCOMPLETIONS) {
|
|
break;
|
|
}
|
|
|
|
for (let i = 0; i < props.length; i++) {
|
|
const prop = props[i];
|
|
if (!propertyMatches(prop)) {
|
|
continue;
|
|
}
|
|
|
|
// If it is an array index, we can't take it.
|
|
// This uses a trick: converting a string to a number yields NaN if
|
|
// the operation failed, and NaN is not equal to itself.
|
|
// eslint-disable-next-line no-self-compare
|
|
if (+prop != +prop) {
|
|
matches.add(prop);
|
|
}
|
|
|
|
if (matches.size >= MAX_AUTOCOMPLETIONS) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return matches;
|
|
}
|
|
|
|
/**
|
|
* Returns a property value based on its name from the given object, by
|
|
* recursively checking the object's prototype.
|
|
*
|
|
* @param object obj
|
|
* An object to look the property into.
|
|
* @param string name
|
|
* The property that is looked up.
|
|
* @returns object|undefined
|
|
* A Debugger.Object if the property exists in the object's prototype
|
|
* chain, undefined otherwise.
|
|
*/
|
|
function getExactMatchImpl(obj, name, {chainIterator, getProperty}) {
|
|
// We need to go up the prototype chain.
|
|
const iter = chainIterator(obj);
|
|
for (obj of iter) {
|
|
const prop = getProperty(obj, name, obj);
|
|
if (prop) {
|
|
return prop.value;
|
|
}
|
|
}
|
|
return undefined;
|
|
}
|
|
|
|
var JSObjectSupport = {
|
|
chainIterator: function* (obj) {
|
|
while (obj) {
|
|
yield obj;
|
|
try {
|
|
obj = Object.getPrototypeOf(obj);
|
|
} catch (error) {
|
|
// The above can throw e.g. for some proxy objects.
|
|
return;
|
|
}
|
|
}
|
|
},
|
|
|
|
getProperties: function(obj) {
|
|
try {
|
|
return Object.getOwnPropertyNames(obj);
|
|
} catch (error) {
|
|
// The above can throw e.g. for some proxy objects.
|
|
return null;
|
|
}
|
|
},
|
|
|
|
getProperty: function() {
|
|
// getProperty is unsafe with raw JS objects.
|
|
throw new Error("Unimplemented!");
|
|
},
|
|
};
|
|
|
|
var DebuggerObjectSupport = {
|
|
chainIterator: function* (obj) {
|
|
while (obj) {
|
|
yield obj;
|
|
try {
|
|
obj = obj.proto;
|
|
} catch (error) {
|
|
// The above can throw e.g. for some proxy objects.
|
|
return;
|
|
}
|
|
}
|
|
},
|
|
|
|
getProperties: function(obj) {
|
|
try {
|
|
return obj.getOwnPropertyNames();
|
|
} catch (error) {
|
|
// The above can throw e.g. for some proxy objects.
|
|
return null;
|
|
}
|
|
},
|
|
|
|
getProperty: function(obj, name, rootObj) {
|
|
// This is left unimplemented in favor to DevToolsUtils.getProperty().
|
|
throw new Error("Unimplemented!");
|
|
},
|
|
};
|
|
|
|
var DebuggerEnvironmentSupport = {
|
|
chainIterator: function* (obj) {
|
|
while (obj) {
|
|
yield obj;
|
|
obj = obj.parent;
|
|
}
|
|
},
|
|
|
|
getProperties: function(obj) {
|
|
const names = obj.names();
|
|
|
|
// Include 'this' in results (in sorted order)
|
|
for (let i = 0; i < names.length; i++) {
|
|
if (i === names.length - 1 || names[i + 1] > "this") {
|
|
names.splice(i + 1, 0, "this");
|
|
break;
|
|
}
|
|
}
|
|
|
|
return names;
|
|
},
|
|
|
|
getProperty: function(obj, name) {
|
|
let result;
|
|
// Try/catch since name can be anything, and getVariable throws if
|
|
// it's not a valid ECMAScript identifier name
|
|
try {
|
|
// TODO: we should use getVariableDescriptor() here - bug 725815.
|
|
result = obj.getVariable(name);
|
|
} catch (e) {
|
|
// Ignore.
|
|
}
|
|
|
|
// FIXME: Need actual UI, bug 941287.
|
|
if (result === undefined || result.optimizedOut ||
|
|
result.missingArguments) {
|
|
return null;
|
|
}
|
|
return { value: result };
|
|
},
|
|
};
|
|
|
|
exports.JSPropertyProvider = DevToolsUtils.makeInfallible(JSPropertyProvider);
|
|
|
|
// Export a version that will throw (for tests)
|
|
exports.FallibleJSPropertyProvider = JSPropertyProvider;
|