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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 type { SourceLocation, Position, PartialPosition } from "../types";
import type { Symbols } from "../reducers/ast";
import type {
AstLocation,
FunctionDeclaration,
ClassDeclaration,
} from "../workers/parser";
export function findBestMatchExpression(symbols: Symbols, tokenPos: Position) {
if (symbols.loading) {
return null;
}
const { line, column } = tokenPos;
const { memberExpressions, identifiers, literals } = symbols;
const members = memberExpressions.filter(({ computed }) => !computed);
return []
.concat(identifiers, members, literals)
.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;
}, null);
}
// Check whether location A starts after location B
export function positionAfter(a: AstLocation, b: AstLocation): boolean {
return (
a.start.line > b.start.line ||
(a.start.line === b.start.line && a.start.column > b.start.column)
);
}
export function containsPosition(a: AstLocation, b: PartialPosition): boolean {
const bColumn = b.column || 0;
const startsBefore =
a.start.line < b.line ||
(a.start.line === b.line && a.start.column <= bColumn);
const endsAfter =
a.end.line > b.line || (a.end.line === b.line && a.end.column >= bColumn);
return startsBefore && endsAfter;
}
function findClosestofSymbol(declarations: any[], location: SourceLocation) {
if (!declarations) {
return null;
}
return declarations.reduce((found, currNode) => {
if (
currNode.name === "anonymous" ||
!containsPosition(currNode.location, {
line: location.line,
column: location.column || 0,
})
) {
return found;
}
if (!found) {
return currNode;
}
if (found.location.start.line > currNode.location.start.line) {
return found;
}
if (
found.location.start.line === currNode.location.start.line &&
found.location.start.column > currNode.location.start.column
) {
return found;
}
return currNode;
}, null);
}
export function findClosestFunction(
symbols: ?Symbols,
location: SourceLocation
): FunctionDeclaration | null {
if (!symbols || symbols.loading) {
return null;
}
return findClosestofSymbol(symbols.functions, location);
}
export function findClosestClass(
symbols: Symbols,
location: SourceLocation
): ClassDeclaration | null {
if (!symbols || symbols.loading) {
return null;
}
return findClosestofSymbol(symbols.classes, location);
}
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