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commands.js
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/* -*- indent-tabs-mode: nil; js-indent-level: 2; js-indent-level: 2 -*- */
/* 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/>. */
// @flow
import { isPaused, getSource, getTopFrame } from "../../selectors";
import { PROMISE } from "../utils/middleware/promise";
import { getNextStep } from "../../workers/parser";
import { addHiddenBreakpoint } from "../breakpoints";
import { features } from "../../utils/prefs";
import type { ThunkArgs } from "../types";
import type { Command } from "../../reducers/types";
/**
* Debugger commands like stepOver, stepIn, stepUp
*
* @param string $0.type
* @memberof actions/pause
* @static
*/
export function command(type: Command) {
return async ({ dispatch, client }: ThunkArgs) => {
return dispatch({
type: "COMMAND",
command: type,
[PROMISE]: client[type]()
});
};
}
/**
* StepIn
* @memberof actions/pause
* @static
* @returns {Function} {@link command}
*/
export function stepIn() {
return ({ dispatch, getState }: ThunkArgs) => {
if (isPaused(getState())) {
return dispatch(command("stepIn"));
}
};
}
/**
* stepOver
* @memberof actions/pause
* @static
* @returns {Function} {@link command}
*/
export function stepOver() {
return ({ dispatch, getState }: ThunkArgs) => {
if (isPaused(getState())) {
return dispatch(astCommand("stepOver"));
}
};
}
/**
* stepOut
* @memberof actions/pause
* @static
* @returns {Function} {@link command}
*/
export function stepOut() {
return ({ dispatch, getState }: ThunkArgs) => {
if (isPaused(getState())) {
return dispatch(command("stepOut"));
}
};
}
/**
* resume
* @memberof actions/pause
* @static
* @returns {Function} {@link command}
*/
export function resume() {
return ({ dispatch, getState }: ThunkArgs) => {
if (isPaused(getState())) {
return dispatch(command("resume"));
}
};
}
/**
* rewind
* @memberof actions/pause
* @static
* @returns {Function} {@link command}
*/
export function rewind() {
return ({ dispatch, getState }: ThunkArgs) => {
if (isPaused(getState())) {
return dispatch(command("rewind"));
}
};
}
/**
* reverseStepIn
* @memberof actions/pause
* @static
* @returns {Function} {@link command}
*/
export function reverseStepIn() {
return ({ dispatch, getState }: ThunkArgs) => {
if (isPaused(getState())) {
return dispatch(command("reverseStepIn"));
}
};
}
/**
* reverseStepOver
* @memberof actions/pause
* @static
* @returns {Function} {@link command}
*/
export function reverseStepOver() {
return ({ dispatch, getState }: ThunkArgs) => {
if (isPaused(getState())) {
return dispatch(astCommand("reverseStepOver"));
}
};
}
/**
* reverseStepOut
* @memberof actions/pause
* @static
* @returns {Function} {@link command}
*/
export function reverseStepOut() {
return ({ dispatch, getState }: ThunkArgs) => {
if (isPaused(getState())) {
return dispatch(command("reverseStepOut"));
}
};
}
/*
* Checks for await or yield calls on the paused line
* This avoids potentially expensive parser calls when we are likely
* not at an async expression.
*/
function hasAwait(source, pauseLocation) {
const { line, column } = pauseLocation;
if (!source.text) {
return false;
}
const lineText = source.text.split("\n")[line - 1];
if (!lineText) {
return false;
}
const snippet = lineText.slice(column - 50, column + 50);
return !!snippet.match(/(yield|await)/);
}
/**
* @memberOf actions/pause
* @static
* @param stepType
* @returns {function(ThunkArgs)}
*/
export function astCommand(stepType: Command) {
return async ({ dispatch, getState, sourceMaps }: ThunkArgs) => {
if (!features.asyncStepping) {
return dispatch(command(stepType));
}
if (stepType == "stepOver") {
// This type definition is ambiguous:
const frame: any = getTopFrame(getState());
const source = getSource(getState(), frame.location.sourceId);
if (source && hasAwait(source, frame.location)) {
const nextLocation = await getNextStep(source.id, frame.location);
if (nextLocation) {
await dispatch(addHiddenBreakpoint(nextLocation));
return dispatch(command("resume"));
}
}
}
return dispatch(command(stepType));
};
}