surma
d44f1d9677
Checkpoint before integration and package validation. Assisted-by: SurmAgent:unknown [read] [edit] [bash]
27 lines
751 B
JavaScript
27 lines
751 B
JavaScript
import { assert, assertThrows } from "./assert.js";
|
|
|
|
function pat(plain) {
|
|
return "(?<g>a)" + "|x".repeat(plain) + "|(?<g>c)";
|
|
}
|
|
|
|
function messageOf(re) {
|
|
try {
|
|
new RegExp(re);
|
|
} catch (e) {
|
|
return e.message;
|
|
}
|
|
return undefined;
|
|
}
|
|
|
|
// 256 alternatives: fine.
|
|
assert(new RegExp(pat(254)).test("a"), true);
|
|
|
|
// 257 alternatives and beyond: explicit error instead of a wrong
|
|
// "duplicate group name" report.
|
|
assert(messageOf(pat(255)), "too many named groups");
|
|
assert(messageOf(pat(1000)), "too many named groups");
|
|
|
|
// A genuine duplicate within the same alternative must still be rejected.
|
|
assert(messageOf("(?<g>a)(?<g>b)"), "duplicate group name");
|
|
assertThrows(SyntaxError, () => new RegExp("(?<g>a)(?<g>b)"));
|