1//===--- tools/extra/clang-tidy/GlobList.cpp ------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "GlobList.h"
10#include "llvm/ADT/STLExtras.h"
11#include "llvm/ADT/SmallString.h"
12
13namespace clang::tidy {
14
15// Returns true if GlobList starts with the negative indicator ('-'), removes it
16// from the GlobList.
17static bool consumeNegativeIndicator(StringRef &GlobList) {
18 GlobList = GlobList.trim();
19 return GlobList.consume_front(Prefix: "-");
20}
21
22// Extracts the first glob from the comma-separated list of globs,
23// removes it and the trailing comma from the GlobList and
24// returns the extracted glob.
25static llvm::StringRef extractNextGlob(StringRef &GlobList) {
26 StringRef UntrimmedGlob = GlobList.substr(Start: 0, N: GlobList.find_first_of(Chars: ",\n"));
27 StringRef Glob = UntrimmedGlob.trim();
28 GlobList = GlobList.substr(Start: UntrimmedGlob.size() + 1);
29 return Glob;
30}
31
32static llvm::Regex createRegexFromGlob(StringRef &Glob) {
33 SmallString<128> RegexText("^");
34 StringRef MetaChars("()^$|*+?.[]\\{}");
35 for (char C : Glob) {
36 if (C == '*')
37 RegexText.push_back(Elt: '.');
38 else if (MetaChars.contains(C))
39 RegexText.push_back(Elt: '\\');
40 RegexText.push_back(Elt: C);
41 }
42 RegexText.push_back(Elt: '$');
43 return {RegexText.str()};
44}
45
46GlobList::GlobList(StringRef Globs, bool KeepNegativeGlobs /* =true */) {
47 Items.reserve(N: Globs.count(C: ',') + Globs.count(C: '\n') + 1);
48 do {
49 GlobListItem Item;
50 Item.IsPositive = !consumeNegativeIndicator(GlobList&: Globs);
51 Item.Text = extractNextGlob(GlobList&: Globs);
52 Item.Regex = createRegexFromGlob(Glob&: Item.Text);
53 if (Item.IsPositive || KeepNegativeGlobs)
54 Items.push_back(Elt: std::move(Item));
55 } while (!Globs.empty());
56}
57
58bool GlobList::contains(StringRef S) const {
59 // Iterating the container backwards as the last match determins if S is in
60 // the list.
61 for (const GlobListItem &Item : llvm::reverse(C: Items)) {
62 if (Item.Regex.match(String: S))
63 return Item.IsPositive;
64 }
65 return false;
66}
67
68bool CachedGlobList::contains(StringRef S) const {
69 auto Entry = Cache.try_emplace(Key: S);
70 bool &Value = Entry.first->getValue();
71 // If the entry was just inserted, determine its required value.
72 if (Entry.second)
73 Value = GlobList::contains(S);
74 return Value;
75}
76
77} // namespace clang::tidy
78

source code of clang-tools-extra/clang-tidy/GlobList.cpp