1 // Copyright 2016 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "src/inspector/v8-regex.h"
6
7 #include <limits.h>
8
9 #include "src/inspector/string-util.h"
10 #include "src/inspector/v8-inspector-impl.h"
11
12 #include "include/v8-inspector.h"
13
14 namespace v8_inspector {
15
V8Regex(V8InspectorImpl * inspector,const String16 & pattern,bool caseSensitive,bool multiline)16 V8Regex::V8Regex(V8InspectorImpl* inspector, const String16& pattern,
17 bool caseSensitive, bool multiline)
18 : m_inspector(inspector) {
19 v8::Isolate* isolate = m_inspector->isolate();
20 v8::HandleScope handleScope(isolate);
21 v8::Local<v8::Context> context = m_inspector->regexContext();
22 v8::Context::Scope contextScope(context);
23 v8::TryCatch tryCatch(isolate);
24
25 unsigned flags = v8::RegExp::kNone;
26 if (!caseSensitive) flags |= v8::RegExp::kIgnoreCase;
27 if (multiline) flags |= v8::RegExp::kMultiline;
28
29 v8::Local<v8::RegExp> regex;
30 if (v8::RegExp::New(context, toV8String(isolate, pattern),
31 static_cast<v8::RegExp::Flags>(flags))
32 .ToLocal(®ex))
33 m_regex.Reset(isolate, regex);
34 else if (tryCatch.HasCaught())
35 m_errorMessage = toProtocolString(tryCatch.Message()->Get());
36 else
37 m_errorMessage = "Internal error";
38 }
39
match(const String16 & string,int startFrom,int * matchLength) const40 int V8Regex::match(const String16& string, int startFrom,
41 int* matchLength) const {
42 if (matchLength) *matchLength = 0;
43
44 if (m_regex.IsEmpty() || string.isEmpty()) return -1;
45
46 // v8 strings are limited to int.
47 if (string.length() > INT_MAX) return -1;
48
49 v8::Isolate* isolate = m_inspector->isolate();
50 v8::HandleScope handleScope(isolate);
51 v8::Local<v8::Context> context = m_inspector->regexContext();
52 v8::MicrotasksScope microtasks(isolate,
53 v8::MicrotasksScope::kDoNotRunMicrotasks);
54 v8::TryCatch tryCatch(isolate);
55
56 v8::Local<v8::RegExp> regex = m_regex.Get(isolate);
57 v8::Local<v8::Value> exec;
58 if (!regex->Get(context, toV8StringInternalized(isolate, "exec"))
59 .ToLocal(&exec))
60 return -1;
61 v8::Local<v8::Value> argv[] = {
62 toV8String(isolate, string.substring(startFrom))};
63 v8::Local<v8::Value> returnValue;
64 if (!exec.As<v8::Function>()
65 ->Call(context, regex, arraysize(argv), argv)
66 .ToLocal(&returnValue))
67 return -1;
68
69 // RegExp#exec returns null if there's no match, otherwise it returns an
70 // Array of strings with the first being the whole match string and others
71 // being subgroups. The Array also has some random properties tacked on like
72 // "index" which is the offset of the match.
73 //
74 // https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/RegExp/exec
75
76 DCHECK(!returnValue.IsEmpty());
77 if (!returnValue->IsArray()) return -1;
78
79 v8::Local<v8::Array> result = returnValue.As<v8::Array>();
80 v8::Local<v8::Value> matchOffset;
81 if (!result->Get(context, toV8StringInternalized(isolate, "index"))
82 .ToLocal(&matchOffset))
83 return -1;
84 if (matchLength) {
85 v8::Local<v8::Value> match;
86 if (!result->Get(context, 0).ToLocal(&match)) return -1;
87 *matchLength = match.As<v8::String>()->Length();
88 }
89
90 return matchOffset.As<v8::Int32>()->Value() + startFrom;
91 }
92
93 } // namespace v8_inspector
94