angular-cn/aio/tools/firebase-test-utils/FirebaseGlob.ts

75 lines
2.7 KiB
TypeScript

import * as XRegExp from 'xregexp';
const dot = /\./g;
const star = /\*/g;
const doubleStar = /(^|\/)\*\*($|\/)/g; // e.g. a/**/b or **/b or a/** but not a**b
const modifiedPatterns = /(.)\(([^)]+)\)/g; // e.g. `@(a|b)
const restParam = /\/:([A-Za-z]+)\*/g; // e.g. `:rest*`
const namedParam = /\/:([A-Za-z]+)/g; // e.g. `:api`
const possiblyEmptyInitialSegments = /^\.🐷\//g; // e.g. `**/a` can also match `a`
const possiblyEmptySegments = /\/\.🐷\//g; // e.g. `a/**/b` can also match `a/b`
const willBeStar = /🐷/g; // e.g. `a**b` not matched by previous rule
export class FirebaseGlob {
pattern: string;
regex: XRegExp;
namedParams: { [key: string]: boolean } = {};
restParams: { [key: string]: boolean } = {};
constructor(glob: string) {
try {
const pattern = glob
.replace(dot, '\\.')
.replace(modifiedPatterns, replaceModifiedPattern)
.replace(restParam, (_, param) => {
// capture the rest of the string
this.restParams[param] = true;
return `(?:/(?<${param}>.🐷))?`;
})
.replace(namedParam, (_, param) => {
// capture the named parameter
this.namedParams[param] = true;
return `/(?<${param}>[^/]+)`;
})
.replace(doubleStar, '$1.🐷$2') // use the pig to avoid replacing ** in next rule
.replace(star, '[^/]*') // match a single segment
.replace(possiblyEmptyInitialSegments, '(?:.*)')// deal with **/ special cases
.replace(possiblyEmptySegments, '(?:/|/.*/)') // deal with /**/ special cases
.replace(willBeStar, '*'); // other ** matches
this.pattern = `^${pattern}$`;
this.regex = XRegExp(this.pattern);
} catch (e) {
throw new Error(`Error in FirebaseGlob: "${glob}" - ${e.message}`);
}
}
test(url: string) {
return XRegExp.test(url, this.regex);
}
match(url: string) {
const match = XRegExp.exec(url, this.regex);
if (match) {
const result = {};
const names = (this.regex as any).xregexp.captureNames || [];
names.forEach(name => result[name] = match[name]);
return result;
}
}
}
function replaceModifiedPattern(_, modifier, pattern) {
switch (modifier) {
case '!':
throw new Error(`"not" expansions are not supported: "${_}"`);
case '?':
case '+':
return `(${pattern})${modifier}`;
case '*':
return `(${pattern})🐷`; // it will become a star
case '@':
return `(${pattern})`;
default:
throw new Error(`unknown expansion type: "${modifier}" in "${_}"`);
}
}