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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/>. */
// @flow
import { isConsole } from "../utils/preview";
import { findBestMatchExpression } from "../utils/ast";
import { PROMISE } from "./utils/middleware/promise";
import { getExpressionFromCoords } from "../utils/editor/get-expression";
import { isOriginal } from "../utils/source";
import {
getPreview,
isLineInScope,
isSelectedFrameVisible,
getSelectedSource,
getSelectedFrame,
getSymbols,
getCurrentThread
} from "../selectors";
import { getMappedExpression } from "./expressions";
import type { Action, ThunkArgs } from "./types";
import type { Position, Context } from "../types";
import type { AstLocation } from "../workers/parser";
function findExpressionMatch(state, codeMirror, tokenPos) {
const source = getSelectedSource(state);
if (!source) {
return;
}
const symbols = getSymbols(state, source);
let match;
if (!symbols || symbols.loading) {
match = getExpressionFromCoords(codeMirror, tokenPos);
} else {
match = findBestMatchExpression(symbols, tokenPos);
}
return match;
}
export function updatePreview(
cx: Context,
target: HTMLElement,
tokenPos: Object,
codeMirror: any
) {
return ({ dispatch, getState, client, sourceMaps }: ThunkArgs) => {
const cursorPos = target.getBoundingClientRect();
if (
!isSelectedFrameVisible(getState()) ||
!isLineInScope(getState(), tokenPos.line)
) {
return;
}
const match = findExpressionMatch(getState(), codeMirror, tokenPos);
if (!match) {
return;
}
const { expression, location } = match;
if (isConsole(expression)) {
return;
}
dispatch(setPreview(cx, expression, location, tokenPos, cursorPos));
};
}
export function setPreview(
cx: Context,
expression: string,
location: AstLocation,
tokenPos: Position,
cursorPos: ClientRect
) {
return async ({ dispatch, getState, client, sourceMaps }: ThunkArgs) => {
await dispatch({
type: "SET_PREVIEW",
cx,
[PROMISE]: (async function() {
const source = getSelectedSource(getState());
if (!source) {
return;
}
const thread = getCurrentThread(getState());
const selectedFrame = getSelectedFrame(getState(), thread);
if (location && isOriginal(source)) {
const mapResult = await dispatch(getMappedExpression(expression));
if (mapResult) {
expression = mapResult.expression;
}
}
if (!selectedFrame) {
return;
}
const { result } = await client.evaluateInFrame(expression, {
frameId: selectedFrame.id,
thread
});
// Error case occurs for a token that follows an errored evaluation
// https://github.com/firefox-devtools/debugger/pull/8056
// Accommodating for null allows us to show preview for falsy values
// line "", false, null, Nan, and more
if (result === null) {
return;
}
// Handle cases where the result is invisible to the debugger
// and not possible to preview. Bug 1548256
if (result.class && result.class.includes("InvisibleToDebugger")) {
return;
}
const root = {
name: expression,
path: expression,
contents: { value: result }
};
const properties = await client.loadObjectProperties(root);
return {
expression,
result,
properties,
root,
location,
tokenPos,
cursorPos
};
})()
});
};
}
export function clearPreview(cx: Context) {
return ({ dispatch, getState, client }: ThunkArgs) => {
const currentSelection = getPreview(getState());
if (!currentSelection) {
return;
}
return dispatch(
({
type: "CLEAR_SELECTION",
cx
}: Action)
);
};
}