src/vs/workbench/services/themes/common/textMateScopeMatcher.ts
134 LOC · 81 covered · 53 uncovered · 14 ranges · 20 concepts · 3 introducers · 7 tests
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/*---------------------------------------------------------------------------------------------
colorThemeData.ts ×57
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
'use strict';
export interface MatcherWithPriority<T> {
matcher: Matcher<T>;
priority: -1 | 0 | 1;
}
export interface Matcher<T> {
(matcherInput: T): number;
}
export function createMatchers<T>(selector: string, matchesName: (names: string[], matcherInput: T) => number, results: MatcherWithPriority<T>[]): void {
let token = tokenizer.next();
while (token !== null) {
let priority: -1 | 0 | 1 = 0;
if (token.length === 2 && token.charAt(1) === ':') {
switch (token.charAt(0)) {
case 'R': priority = 1; break;
case 'L': priority = -1; break;
default:
console.log(`Unknown priority ${token} in scope selector`);
}
token = tokenizer.next();
}
if (matcher) {
results.push({ matcher, priority });
}
if (token !== ',') {
break;
}
}
function parseOperand(): Matcher<T> | null {
if (token === '-') {
token = tokenizer.next();
const expressionToNegate = parseOperand();
if (!expressionToNegate) {
return null;
}
return matcherInput => {
const score = expressionToNegate(matcherInput);
return score < 0 ? 0 : -1;
};
}
token = tokenizer.next();
const expressionInParents = parseInnerExpression();
if (token === ')') {
token = tokenizer.next();
}
return expressionInParents;
}
const identifiers: string[] = [];
do {
identifiers.push(token);
token = tokenizer.next();
} while (isIdentifier(token));
return matcherInput => matchesName(identifiers, matcherInput);
}
return null;
}
function parseConjunction(): Matcher<T> | null {
let matcher = parseOperand();
if (!matcher) {
return null;
}
const matchers: Matcher<T>[] = [];
while (matcher) {
matchers.push(matcher);
matcher = parseOperand();
}
return matcherInput => { // and
let min = matchers[0](matcherInput);
for (let i = 1; min >= 0 && i < matchers.length; i++) {
min = Math.min(min, matchers[i](matcherInput));
}
};
}
function parseInnerExpression(): Matcher<T> | null {
let matcher = parseConjunction();
if (!matcher) {
return null;
}
const matchers: Matcher<T>[] = [];
while (matcher) {
matchers.push(matcher);
if (token === '|' || token === ',') {
do {
token = tokenizer.next();
} while (token === '|' || token === ','); // ignore subsequent commas
} else {
break;
}
matcher = parseConjunction();
}
return matcherInput => { // or
let max = matchers[0](matcherInput);
for (let i = 1; i < matchers.length; i++) {
max = Math.max(max, matchers[i](matcherInput));
}
return max;
};
}
return !!token && !!token.match(/[\w\.:]+/);
}
const regex = /([LR]:|[\w\.:][\w\.:\-]*|[\,\|\-\(\)])/g;
let match = regex.exec(input);
return {
next: () => {
if (!match) {
return null;
}
const res = match[0];
match = regex.exec(input);
return res;
}
};
}