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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
import {
getExpression,
getExpressions,
getSelectedSource,
getSelectedScopeMappings,
getSelectedFrameBindings,
getIsPaused,
getSelectedFrame,
getCurrentThread,
isMapScopesEnabled,
} from "../selectors/index";
import { PROMISE } from "./utils/middleware/promise";
import { wrapExpression } from "../utils/expressions";
import { features } from "../utils/prefs";
/**
* Add expression for debugger to watch
*
* @param {string} input
*/
export function addExpression(input) {
return async ({ dispatch, getState, parserWorker }) => {
if (!input) {
return null;
}
// If the expression already exists, only update its evaluation
let expression = getExpression(getState(), input);
if (!expression) {
// This will only display the expression input,
// evaluateExpression will update its value.
dispatch({ type: "ADD_EXPRESSION", input });
expression = getExpression(getState(), input);
// When there is an expression error, we won't store the expression
if (!expression) {
return null;
}
}
return dispatch(evaluateExpression(expression));
};
}
export function autocomplete(input, cursor) {
return async ({ dispatch, getState, client }) => {
if (!input) {
return;
}
const thread = getCurrentThread(getState());
const selectedFrame = getSelectedFrame(getState(), thread);
const result = await client.autocomplete(input, cursor, selectedFrame?.id);
// Pass both selectedFrame and thread in case selectedFrame is null
dispatch({ type: "AUTOCOMPLETE", selectedFrame, thread, input, result });
};
}
export function clearAutocomplete() {
return { type: "CLEAR_AUTOCOMPLETE" };
}
export function updateExpression(input, expression) {
return async ({ getState, dispatch, parserWorker }) => {
if (!input) {
return;
}
dispatch({
type: "UPDATE_EXPRESSION",
expression,
input,
});
await dispatch(evaluateExpressionsForCurrentContext());
};
}
/**
*
* @param {object} expression
* @param {string} expression.input
*/
export function deleteExpression(expression) {
return {
type: "DELETE_EXPRESSION",
input: expression.input,
};
}
export function evaluateExpressionsForCurrentContext() {
return async ({ getState, dispatch }) => {
const thread = getCurrentThread(getState());
const selectedFrame = getSelectedFrame(getState(), thread);
await dispatch(evaluateExpressions(selectedFrame));
};
}
/**
* Update all the expressions by querying the server for updated values.
*
* @param {object} selectedFrame
* If defined, will evaluate the expression against this given frame,
* otherwise it will use the global scope of the thread.
*/
export function evaluateExpressions(selectedFrame) {
return async function ({ dispatch, getState, client }) {
const expressions = getExpressions(getState());
const inputs = expressions.map(({ input }) => input);
// Fallback to global scope of the current thread when selectedFrame is null
const thread = selectedFrame?.thread || getCurrentThread(getState());
const results = await client.evaluateExpressions(inputs, {
// We will only have a specific frame when passing a Selected frame context.
frameId: selectedFrame?.id,
threadId: thread,
});
// Pass both selectedFrame and thread in case selectedFrame is null
dispatch({
type: "EVALUATE_EXPRESSIONS",
selectedFrame,
// As `selectedFrame` can be null, pass `thread` to help
// the reducer know what is the related thread of this action.
thread,
inputs,
results,
});
};
}
function evaluateExpression(expression) {
return async function (thunkArgs) {
let { input } = expression;
if (!input) {
console.warn("Expressions should not be empty");
return null;
}
const { dispatch, getState, client } = thunkArgs;
const thread = getCurrentThread(getState());
const selectedFrame = getSelectedFrame(getState(), thread);
const selectedSource = getSelectedSource(getState());
// Only map when we are paused and if the currently selected source is original,
// and the paused location is also original.
if (
selectedFrame &&
selectedSource &&
selectedFrame.location.source.isOriginal &&
selectedSource.isOriginal
) {
const mapResult = await getMappedExpression(
input,
selectedFrame.thread,
thunkArgs
);
if (mapResult) {
input = mapResult.expression;
}
}
// Pass both selectedFrame and thread in case selectedFrame is null
return dispatch({
type: "EVALUATE_EXPRESSION",
selectedFrame,
// When we aren't passing a frame, we have to pass a thread to the pause reducer
thread: selectedFrame ? null : thread,
input: expression.input,
[PROMISE]: client.evaluate(wrapExpression(input), {
// When evaluating against the global scope (when not paused)
// frameId will be null here.
frameId: selectedFrame?.id,
}),
});
};
}
/**
* Gets information about original variable names from the source map
* and replaces all possible generated names.
*/
export function getMappedExpression(expression, thread, thunkArgs) {
const { getState, parserWorker } = thunkArgs;
const mappings = getSelectedScopeMappings(getState(), thread);
const bindings = getSelectedFrameBindings(getState(), thread);
// We bail early if we do not need to map the expression. This is important
// because mapping an expression can be slow if the parserWorker
// worker is busy doing other work.
//
// 1. there are no mappings - we do not need to map original expressions
// 2. does not contain `await` - we do not need to map top level awaits
// 3. does not contain `=` - we do not need to map assignments
const shouldMapScopes = isMapScopesEnabled(getState()) && mappings;
if (!shouldMapScopes && !expression.match(/(await|=)/)) {
return null;
}
return parserWorker.mapExpression(
expression,
mappings,
bindings || [],
features.mapExpressionBindings && getIsPaused(getState(), thread),
features.mapAwaitExpression
);
}
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