Line data    Source code

       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             : 
      16         125 : V8Regex::V8Regex(V8InspectorImpl* inspector, const String16& pattern,
      17             :                  bool caseSensitive, bool multiline)
      18         125 :     : m_inspector(inspector) {
      19         125 :   v8::Isolate* isolate = m_inspector->isolate();
      20         125 :   v8::HandleScope handleScope(isolate);
      21         125 :   v8::Local<v8::Context> context = m_inspector->regexContext();
      22             :   v8::Context::Scope contextScope(context);
      23         250 :   v8::TryCatch tryCatch(isolate);
      24             : 
      25             :   unsigned flags = v8::RegExp::kNone;
      26         125 :   if (!caseSensitive) flags |= v8::RegExp::kIgnoreCase;
      27         125 :   if (multiline) flags |= v8::RegExp::kMultiline;
      28             : 
      29             :   v8::Local<v8::RegExp> regex;
      30         125 :   if (v8::RegExp::New(context, toV8String(isolate, pattern),
      31         125 :                       static_cast<v8::RegExp::Flags>(flags))
      32         125 :           .ToLocal(&regex))
      33             :     m_regex.Reset(isolate, regex);
      34           5 :   else if (tryCatch.HasCaught())
      35          15 :     m_errorMessage = toProtocolString(isolate, tryCatch.Message()->Get());
      36             :   else
      37         125 :     m_errorMessage = "Internal error";
      38         125 : }
      39             : 
      40         505 : int V8Regex::match(const String16& string, int startFrom,
      41             :                    int* matchLength) const {
      42         505 :   if (matchLength) *matchLength = 0;
      43             : 
      44        1010 :   if (m_regex.IsEmpty() || string.isEmpty()) return -1;
      45             : 
      46             :   // v8 strings are limited to int.
      47         495 :   if (string.length() > INT_MAX) return -1;
      48             : 
      49         495 :   v8::Isolate* isolate = m_inspector->isolate();
      50         495 :   v8::HandleScope handleScope(isolate);
      51         495 :   v8::Local<v8::Context> context = m_inspector->regexContext();
      52             :   v8::Context::Scope contextScope(context);
      53             :   v8::MicrotasksScope microtasks(isolate,
      54         990 :                                  v8::MicrotasksScope::kDoNotRunMicrotasks);
      55         990 :   v8::TryCatch tryCatch(isolate);
      56             : 
      57             :   v8::Local<v8::RegExp> regex = m_regex.Get(isolate);
      58             :   v8::Local<v8::Value> exec;
      59         990 :   if (!regex->Get(context, toV8StringInternalized(isolate, "exec"))
      60         495 :            .ToLocal(&exec))
      61             :     return -1;
      62             :   v8::Local<v8::Value> argv[] = {
      63         990 :       toV8String(isolate, string.substring(startFrom))};
      64             :   v8::Local<v8::Value> returnValue;
      65         495 :   if (!exec.As<v8::Function>()
      66         495 :            ->Call(context, regex, arraysize(argv), argv)
      67         495 :            .ToLocal(&returnValue))
      68             :     return -1;
      69             : 
      70             :   // RegExp#exec returns null if there's no match, otherwise it returns an
      71             :   // Array of strings with the first being the whole match string and others
      72             :   // being subgroups. The Array also has some random properties tacked on like
      73             :   // "index" which is the offset of the match.
      74             :   //
      75             :   // https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/RegExp/exec
      76             : 
      77             :   DCHECK(!returnValue.IsEmpty());
      78         495 :   if (!returnValue->IsArray()) return -1;
      79             : 
      80             :   v8::Local<v8::Array> result = returnValue.As<v8::Array>();
      81             :   v8::Local<v8::Value> matchOffset;
      82         510 :   if (!result->Get(context, toV8StringInternalized(isolate, "index"))
      83         255 :            .ToLocal(&matchOffset))
      84             :     return -1;
      85         255 :   if (matchLength) {
      86             :     v8::Local<v8::Value> match;
      87           0 :     if (!result->Get(context, 0).ToLocal(&match)) return -1;
      88           0 :     *matchLength = match.As<v8::String>()->Length();
      89             :   }
      90             : 
      91         750 :   return matchOffset.As<v8::Int32>()->Value() + startFrom;
      92             : }
      93             : 
      94             : }  // namespace v8_inspector