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// @flow
import {
getSource,
hasSymbols,
getSelectedLocation,
getSelectedSource,
getSelectedFrame,
getPreview
} from "../selectors";
import { ensureParserHasSourceText } from "./sources";
import { PROMISE } from "../utils/redux/middleware/promise";
import {
getScopes,
getSymbols,
getEmptyLines,
getOutOfScopeLocations
} from "../utils/parser";
import { isGeneratedId } from "devtools-source-map";
import { replaceOriginalVariableName } from "devtools-map-bindings/src/utils";
import type { SourceId } from "debugger-html";
import type { ThunkArgs } from "./types";
import type { AstLocation } from "../utils/parser";
/**
* Gets information about original variable names from the source map
* and replaces all posible generated names.
*/
async function getSourcemapedExpression(
{ sourceMaps },
generatedLocation: Location,
expression: string
): Promise<string> {
const astScopes = await getScopes(generatedLocation);
const generatedScopes = await sourceMaps.getLocationScopes(
generatedLocation,
astScopes
);
if (!generatedScopes) {
return expression;
}
return replaceOriginalVariableName(expression, generatedScopes);
}
export function setSymbols(sourceId: SourceId) {
return async ({ dispatch, getState }: ThunkArgs) => {
const sourceRecord = getSource(getState(), sourceId);
if (!sourceRecord) {
return;
}
const source = sourceRecord.toJS();
if (!source.text || hasSymbols(getState(), source)) {
return;
}
const symbols = await getSymbols(source);
dispatch({
type: "SET_SYMBOLS",
source,
symbols
});
};
}
export function setEmptyLines(sourceId: SourceId) {
return async ({ dispatch, getState }: ThunkArgs) => {
const sourceRecord = getSource(getState(), sourceId);
if (!sourceRecord) {
return;
}
const source = sourceRecord.toJS();
if (!source.text) {
return;
}
const emptyLines = await getEmptyLines(source);
dispatch({
type: "SET_EMPTY_LINES",
source,
emptyLines
});
};
}
export function setOutOfScopeLocations() {
return async ({ dispatch, getState }: ThunkArgs) => {
const location = getSelectedLocation(getState());
if (!location) {
return;
}
const source = getSource(getState(), location.sourceId);
if (!location.line || !source) {
return dispatch({
type: "OUT_OF_SCOPE_LOCATIONS",
locations: null
});
}
const locations = await getOutOfScopeLocations(source.toJS(), location);
return dispatch({
type: "OUT_OF_SCOPE_LOCATIONS",
locations
});
};
}
export function clearPreview() {
return ({ dispatch, getState, client }: ThunkArgs) => {
const currentSelection = getPreview(getState());
if (!currentSelection) {
return;
}
return dispatch({
type: "CLEAR_SELECTION"
});
};
}
function findBestMatch(symbols, tokenPos, token) {
const { memberExpressions, identifiers } = symbols;
const { line, column } = tokenPos;
return identifiers.concat(memberExpressions).reduce((found, expression) => {
const overlaps =
expression.location.start.line == line &&
expression.location.start.column <= column &&
expression.location.end.column >= column;
if (overlaps) {
return expression;
}
return found;
}, {});
}
export function setPreview(
token: string,
tokenPos: AstLocation,
cursorPos: any
) {
return async ({ dispatch, getState, client, sourceMaps }: ThunkArgs) => {
const currentSelection = getPreview(getState());
if (currentSelection && currentSelection.updating) {
return;
}
await dispatch({
type: "SET_PREVIEW",
[PROMISE]: (async function() {
const source = getSelectedSource(getState());
const _symbols = await getSymbols(source.toJS());
const found = findBestMatch(_symbols, tokenPos, token);
if (!found) {
return;
}
let { expression, location } = found;
if (!expression) {
return;
}
const sourceId = source.get("id");
if (location && !isGeneratedId(sourceId)) {
const generatedLocation = await sourceMaps.getGeneratedLocation(
{ ...location.start, sourceId },
source.toJS()
);
const generatedSourceId = generatedLocation.sourceId;
await dispatch(ensureParserHasSourceText(generatedSourceId));
expression = await getSourcemapedExpression(
{ dispatch, sourceMaps },
generatedLocation,
expression
);
}
const selectedFrame = getSelectedFrame(getState());
const { result } = await client.evaluate(expression, {
frameId: selectedFrame.id
});
if (result === undefined) {
return;
}
return {
expression,
result,
location,
tokenPos,
cursorPos
};
})()
});
};
}