88 lines
2.7 KiB
TypeScript
88 lines
2.7 KiB
TypeScript
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/**
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* Copyright (c) Microsoft Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// This file can't have dependencies, it is a part of the utility script.
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export type ParsedSelector = {
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parts: {
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name: string,
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body: string,
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}[],
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capture?: number,
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};
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export function parseSelector(selector: string): ParsedSelector {
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let index = 0;
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let quote: string | undefined;
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let start = 0;
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const result: ParsedSelector = { parts: [] };
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const append = () => {
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const part = selector.substring(start, index).trim();
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const eqIndex = part.indexOf('=');
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let name: string;
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let body: string;
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if (eqIndex !== -1 && part.substring(0, eqIndex).trim().match(/^[a-zA-Z_0-9-+:*]+$/)) {
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name = part.substring(0, eqIndex).trim();
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body = part.substring(eqIndex + 1);
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} else if (part.length > 1 && part[0] === '"' && part[part.length - 1] === '"') {
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name = 'text';
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body = part;
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} else if (part.length > 1 && part[0] === "'" && part[part.length - 1] === "'") {
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name = 'text';
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body = part;
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} else if (/^\(*\/\//.test(part)) {
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// If selector starts with '//' or '//' prefixed with multiple opening
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// parenthesis, consider xpath. @see https://github.com/microsoft/playwright/issues/817
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name = 'xpath';
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body = part;
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} else {
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name = 'css';
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body = part;
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}
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let capture = false;
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if (name[0] === '*') {
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capture = true;
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name = name.substring(1);
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}
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result.parts.push({ name, body });
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if (capture) {
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if (result.capture !== undefined)
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throw new Error(`Only one of the selectors can capture using * modifier`);
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result.capture = result.parts.length - 1;
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}
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};
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while (index < selector.length) {
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const c = selector[index];
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if (c === '\\' && index + 1 < selector.length) {
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index += 2;
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} else if (c === quote) {
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quote = undefined;
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index++;
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} else if (!quote && (c === '"' || c === '\'' || c === '`')) {
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quote = c;
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index++;
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} else if (!quote && c === '>' && selector[index + 1] === '>') {
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append();
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index += 2;
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start = index;
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} else {
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index++;
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}
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}
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append();
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return result;
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}
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