/
util.ts
93 lines (79 loc) 路 2.59 KB
/
util.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
import type { types as t } from "@babel/core";
import { FEATURES, hasFeature } from "./features";
import type { RegexpuOptions } from "regexpu-core";
export function generateRegexpuOptions(
pattern: string,
toTransform: number,
): RegexpuOptions {
type Experimental = 1;
const feat = <Stability extends 0 | 1 = 0>(
name: keyof typeof FEATURES,
ok: "transform" | (Stability extends 0 ? never : "parse") = "transform",
) => {
return hasFeature(toTransform, FEATURES[name]) ? ok : false;
};
const featDuplicateNamedGroups = (): "transform" | false => {
if (!feat("duplicateNamedCaptureGroups")) return false;
// This can return false positive, for example for /\(?<a>\)/.
// However, it's such a rare occurrence that it's ok to compile
// the regexp even if we only need to compile regexps with
// duplicate named capturing groups.
const regex = /\(\?<([^>]+)>/g;
const seen = new Set();
for (let match; (match = regex.exec(pattern)); seen.add(match[1])) {
if (seen.has(match[1])) return "transform";
}
return false;
};
return {
unicodeFlag: feat("unicodeFlag"),
unicodeSetsFlag:
feat<Experimental>("unicodeSetsFlag") ||
feat<Experimental>("unicodeSetsFlag_syntax", "parse"),
dotAllFlag: feat("dotAllFlag"),
unicodePropertyEscapes: feat("unicodePropertyEscape"),
namedGroups: feat("namedCaptureGroups") || featDuplicateNamedGroups(),
onNamedGroup: () => {},
modifiers: feat("modifiers"),
};
}
export function canSkipRegexpu(
node: t.RegExpLiteral,
options: RegexpuOptions,
): boolean {
const { flags, pattern } = node;
if (flags.includes("v")) {
if (options.unicodeSetsFlag === "transform") return false;
}
if (flags.includes("u")) {
if (options.unicodeFlag === "transform") return false;
if (
options.unicodePropertyEscapes === "transform" &&
/\\[pP]{/.test(pattern)
) {
return false;
}
}
if (flags.includes("s")) {
if (options.dotAllFlag === "transform") return false;
}
if (options.namedGroups === "transform" && /\(\?<(?![=!])/.test(pattern)) {
return false;
}
if (options.modifiers === "transform" && /\(\?[\w-]+:/.test(pattern)) {
return false;
}
return true;
}
export function transformFlags(regexpuOptions: RegexpuOptions, flags: string) {
if (regexpuOptions.unicodeSetsFlag === "transform") {
flags = flags.replace("v", "u");
}
if (regexpuOptions.unicodeFlag === "transform") {
flags = flags.replace("u", "");
}
if (regexpuOptions.dotAllFlag === "transform") {
flags = flags.replace("s", "");
}
return flags;
}