809 lines
23 KiB
JavaScript
809 lines
23 KiB
JavaScript
/* 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("resource://devtools/shared/DevToolsUtils.js");
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const {
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evalWithDebugger,
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} = require("resource://devtools/server/actors/webconsole/eval-with-debugger.js");
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if (!isWorker) {
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loader.lazyRequireGetter(
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this,
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"getSyntaxTrees",
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"resource://devtools/shared/webconsole/parser-helper.js",
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true
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);
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}
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const lazy = {};
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if (!isWorker) {
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ChromeUtils.defineESModuleGetters(
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lazy,
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{
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Reflect: "resource://gre/modules/reflect.sys.mjs",
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},
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{ global: "contextual" }
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);
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}
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loader.lazyRequireGetter(
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this,
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[
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"analyzeInputString",
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"shouldInputBeAutocompleted",
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"shouldInputBeEagerlyEvaluated",
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],
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"resource://devtools/shared/webconsole/analyze-input-string.js",
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true
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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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/**
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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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* - {Array} authorizedEvaluations (defaults to []).
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* Optional array containing all the different properties access that the engine
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* can execute 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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* - {Array<string>}: expressionVars
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* Optional array containing variable defined in the expression. Those variables
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* are extracted from CodeMirror state.
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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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* getterPath: {Array<String>} An array of the property chain leading to the
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* getter. Example: ["x", "myGetter"]
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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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// eslint-disable-next-line complexity
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function jsPropertyProvider({
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dbgObject,
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environment,
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frameActorId,
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inputValue,
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cursor,
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authorizedEvaluations = [],
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webconsoleActor,
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selectedNodeActor,
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expressionVars = [],
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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 inputAnalysis = analyzeInputString(inputValue);
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if (!shouldInputBeAutocompleted(inputAnalysis)) {
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return null;
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}
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let {
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lastStatement,
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isElementAccess,
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mainExpression,
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matchProp,
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isPropertyAccess,
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} = inputAnalysis;
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// Eagerly evaluate the main expression and return the results properties.
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// e.g. `obj.func().a` will evaluate `obj.func()` and return properties matching `a`.
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// NOTE: this is only useful when the input has a property access.
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if (webconsoleActor && shouldInputBeEagerlyEvaluated(inputAnalysis)) {
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const eagerResponse = evalWithDebugger(
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mainExpression,
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{ eager: true, selectedNodeActor, frameActor: frameActorId },
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webconsoleActor
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);
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const ret = eagerResponse?.result?.return;
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// Only send matches if eager evaluation returned something meaningful
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if (ret && ret !== undefined) {
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const matches =
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typeof ret != "object"
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? getMatchedProps(ret, matchProp)
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: getMatchedPropsInDbgObject(ret, matchProp);
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return prepareReturnedObject({
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matches,
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search: matchProp,
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isElementAccess,
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});
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}
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}
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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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const startQuoteRegex = /^('|"|`)/;
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const env = environment || dbgObject.asEnvironment();
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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 && isPropertyAccess) {
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const syntaxTrees = getSyntaxTrees(mainExpression);
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const lastTree = syntaxTrees[syntaxTrees.length - 1];
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const lastBody = lastTree?.body[lastTree.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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if (!lastBody.expression) {
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return null;
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}
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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 = getContentPrototypeObject(env, "Array");
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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 = getContentPrototypeObject(env, "String");
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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(lastStatement) === false
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) {
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matchingObject = getContentPrototypeObject(env, "Number");
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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 = getMatchedPropsInDbgObject(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 (isPropertyAccess) {
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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 = lastStatement.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(
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0,
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openBracketIndex
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);
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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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if (properties.length === 0) {
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const environmentProperties = getMatchedPropsInEnvironment(env, search);
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const expressionVariables = new Set(
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expressionVars.filter(variableName => variableName.startsWith(matchProp))
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);
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for (const prop of environmentProperties) {
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expressionVariables.add(prop);
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}
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return {
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isElementAccess,
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matchProp,
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matches: expressionVariables,
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};
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}
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let firstProp = properties.shift();
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if (typeof firstProp == "string") {
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firstProp = firstProp.trim();
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}
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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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const propPath = [firstProp].concat(properties.slice(0, index + 1));
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const authorized = authorizedEvaluations.some(
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x => JSON.stringify(x) === JSON.stringify(propPath)
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);
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if (!authorized && DevToolsUtils.isUnsafeGetter(obj, prop)) {
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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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getterPath: propPath,
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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, authorized);
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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 matches =
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typeof obj != "object"
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? getMatchedProps(obj, search)
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: getMatchedPropsInDbgObject(obj, search);
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return prepareReturnedObject({
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matches,
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search,
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isElementAccess,
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elementAccessQuote,
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});
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}
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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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* For a given environment and constructor name, returns its Debugger.Object wrapped
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* prototype.
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*
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* @param {Environment} env
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* @param {String} name: Name of the constructor object we want the prototype of.
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* @returns {Debugger.Object|null} the prototype, or null if it not found.
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*/
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function getContentPrototypeObject(env, name) {
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// Retrieve the outermost environment to get the global object.
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let outermostEnv = env;
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while (outermostEnv?.parent) {
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outermostEnv = outermostEnv.parent;
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}
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const constructorObj = DevToolsUtils.getProperty(outermostEnv.object, name);
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if (!constructorObj) {
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return null;
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}
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return DevToolsUtils.getProperty(constructorObj, "prototype");
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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, expression } = 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 === "OptionalExpression" && expression) {
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result = (getPropertiesFromAstExpression(expression) || []).concat(result);
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} else if (
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type === "MemberExpression" ||
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type === "OptionalMemberExpression"
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) {
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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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function wrapMatchesInQuotes(matches, quote = `"`) {
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return new Set(
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[...matches].map(p => {
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// Escape as a double-quoted string literal
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p = JSON.stringify(p);
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// We don't have to do anything more when using double quotes
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if (quote == `"`) {
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return p;
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}
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// Remove surrounding double quotes
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p = p.slice(1, -1);
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// Unescape inner double quotes (all must be escaped, so no need to count backslashes)
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p = p.replace(/\\(?=")/g, "");
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// Escape the specified quote (assuming ' or `, which are treated literally in regex)
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p = p.replace(new RegExp(quote, "g"), "\\$&");
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// Template literals treat ${ specially, escape it
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if (quote == "`") {
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p = p.replace(/\${/g, "\\$&");
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}
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// Surround the result with quotes
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return `${quote}${p}${quote}`;
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})
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);
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}
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/**
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* Get the array member of obj for the given prop. For example, given
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* prop='list[0][1]' the element at [0][1] of obj.list is returned.
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*
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* @param object obj
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* The object to operate on. Should be null if env is passed.
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* @param object env
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* The Environment to operate in. Should be null if obj is passed.
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* @param string prop
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* The property to return.
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* @return null or Object
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* Returns null if the property couldn't be located. Otherwise the array
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* member identified by prop.
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*/
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function getArrayMemberProperty(obj, env, prop) {
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// First get the array.
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const propWithoutIndices = prop.substr(0, prop.indexOf("["));
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if (env) {
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obj = getVariableInEnvironment(env, propWithoutIndices);
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} else {
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obj = DevToolsUtils.getProperty(obj, propWithoutIndices);
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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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// Then traverse the list of indices to get the actual element.
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let result;
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const arrayIndicesRegex = /\[[^\]]*\]/g;
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while ((result = arrayIndicesRegex.exec(prop)) !== null) {
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const indexWithBrackets = result[0];
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const indexAsText = indexWithBrackets.substr(
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1,
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indexWithBrackets.length - 2
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);
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const index = parseInt(indexAsText, 10);
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if (isNaN(index)) {
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return null;
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}
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obj = DevToolsUtils.getProperty(obj, index);
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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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return obj;
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}
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/**
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* Check if the given Debugger.Object can be used for autocomplete.
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|
*
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* @param Debugger.Object object
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* The Debugger.Object to check.
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* @return boolean
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* True if further inspection into the object is possible, or false
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* otherwise.
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*/
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function isObjectUsable(object) {
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if (object == null) {
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return false;
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}
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if (typeof object == "object" && object.class == "DeadObject") {
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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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* @see getExactMatchImpl()
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|
*/
|
|
function getVariableInEnvironment(environment, name) {
|
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return getExactMatchImpl(environment, name, DebuggerEnvironmentSupport);
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|
}
|
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|
|
function prepareReturnedObject({
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matches,
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search,
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isElementAccess,
|
|
elementAccessQuote,
|
|
}) {
|
|
if (isElementAccess) {
|
|
// If it's an element access, we need to wrap properties in quotes (either the one
|
|
// the user already typed, or `"`).
|
|
|
|
matches = wrapMatchesInQuotes(matches, elementAccessQuote);
|
|
} else if (!isWorker) {
|
|
// If we're not performing an element access, we need to check that the property
|
|
// are suited for a dot access. (reflect.sys.mjs is not available in worker context yet,
|
|
// see Bug 1507181).
|
|
for (const match of matches) {
|
|
try {
|
|
// In order to know if the property is suited for dot notation, we use Reflect
|
|
// to parse an expression where we try to access the property with a dot. If it
|
|
// throws, this means that we need to do an element access instead.
|
|
lazy.Reflect.parse(`({${match}: true})`);
|
|
} catch (e) {
|
|
matches.delete(match);
|
|
}
|
|
}
|
|
}
|
|
|
|
return { isElementAccess, matchProp: search, matches };
|
|
}
|
|
|
|
/**
|
|
* @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 || prop === "Infinity") {
|
|
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(obj) {
|
|
while (obj) {
|
|
yield obj;
|
|
try {
|
|
obj = Object.getPrototypeOf(obj);
|
|
} catch (error) {
|
|
// The above can throw e.g. for some proxy objects.
|
|
return;
|
|
}
|
|
}
|
|
},
|
|
|
|
getProperties(obj) {
|
|
try {
|
|
return Object.getOwnPropertyNames(obj);
|
|
} catch (error) {
|
|
// The above can throw e.g. for some proxy objects.
|
|
return null;
|
|
}
|
|
},
|
|
|
|
getProperty() {
|
|
// getProperty is unsafe with raw JS objects.
|
|
throw new Error("Unimplemented!");
|
|
},
|
|
};
|
|
|
|
var DebuggerObjectSupport = {
|
|
*chainIterator(obj) {
|
|
while (obj) {
|
|
yield obj;
|
|
try {
|
|
// There could be transparent security wrappers, unwrap to check if it's a proxy.
|
|
const unwrapped = DevToolsUtils.unwrap(obj);
|
|
if (unwrapped === undefined) {
|
|
// Objects belonging to an invisible-to-debugger compartment can't be unwrapped.
|
|
return;
|
|
}
|
|
|
|
if (unwrapped.isProxy) {
|
|
// Proxies might have a `getPrototypeOf` method, which is triggered by `obj.proto`,
|
|
// but this does not impact the actual prototype chain.
|
|
// In such case, we need to use the proxy target prototype.
|
|
// We retrieve proxyTarget from `obj` (and not `unwrapped`) to avoid exposing
|
|
// the unwrapped target.
|
|
obj = unwrapped.proxyTarget;
|
|
}
|
|
obj = obj.proto;
|
|
} catch (error) {
|
|
// The above can throw e.g. for some proxy objects.
|
|
return;
|
|
}
|
|
}
|
|
},
|
|
|
|
getProperties(obj) {
|
|
try {
|
|
return obj.getOwnPropertyNames();
|
|
} catch (error) {
|
|
// The above can throw e.g. for some proxy objects.
|
|
return null;
|
|
}
|
|
},
|
|
|
|
getProperty() {
|
|
// This is left unimplemented in favor to DevToolsUtils.getProperty().
|
|
throw new Error("Unimplemented!");
|
|
},
|
|
};
|
|
|
|
var DebuggerEnvironmentSupport = {
|
|
*chainIterator(obj) {
|
|
while (obj) {
|
|
yield obj;
|
|
obj = obj.parent;
|
|
}
|
|
},
|
|
|
|
getProperties(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(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 == null ||
|
|
(typeof result == "object" &&
|
|
(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;
|