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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "platform/v8_inspector/V8Regex.h"
#include "platform/v8_inspector/V8DebuggerImpl.h"
#include "platform/v8_inspector/V8StringUtil.h"
#include "platform/v8_inspector/public/V8DebuggerClient.h"
namespace blink {
V8Regex::V8Regex(V8DebuggerImpl* debugger, const String16& pattern, bool caseSensitive, bool multiline)
: m_debugger(debugger)
{
v8::Isolate* isolate = m_debugger->isolate();
v8::HandleScope handleScope(isolate);
v8::Local<v8::Context> context = m_debugger->regexContext();
v8::Context::Scope contextScope(context);
v8::TryCatch tryCatch(isolate);
unsigned flags = v8::RegExp::kNone;
if (!caseSensitive)
flags |= v8::RegExp::kIgnoreCase;
if (multiline)
flags |= v8::RegExp::kMultiline;
v8::Local<v8::RegExp> regex;
if (v8::RegExp::New(context, toV8String(isolate, pattern), static_cast<v8::RegExp::Flags>(flags)).ToLocal(®ex))
m_regex.Reset(isolate, regex);
}
int V8Regex::match(const String16& string, int startFrom, int* matchLength) const
{
if (matchLength)
*matchLength = 0;
if (m_regex.IsEmpty() || string.isEmpty())
return -1;
// v8 strings are limited to int.
if (string.length() > INT_MAX)
return -1;
v8::Isolate* isolate = m_debugger->isolate();
v8::HandleScope handleScope(isolate);
v8::Local<v8::Context> context = m_debugger->regexContext();
v8::Context::Scope contextScope(context);
v8::TryCatch tryCatch(isolate);
v8::Local<v8::RegExp> regex = m_regex.Get(isolate);
v8::Local<v8::Value> exec;
if (!regex->Get(context, toV8StringInternalized(isolate, "exec")).ToLocal(&exec))
return -1;
v8::Local<v8::Value> argv[] = { toV8String(isolate, string.substring(startFrom)) };
v8::Local<v8::Value> returnValue;
if (!m_debugger->client()->callInternalFunction(exec.As<v8::Function>(), regex, WTF_ARRAY_LENGTH(argv), argv).ToLocal(&returnValue))
return -1;
// RegExp#exec returns null if there's no match, otherwise it returns an
// Array of strings with the first being the whole match string and others
// being subgroups. The Array also has some random properties tacked on like
// "index" which is the offset of the match.
//
// https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/RegExp/exec
ASSERT(!returnValue.IsEmpty());
if (!returnValue->IsArray())
return -1;
v8::Local<v8::Array> result = returnValue.As<v8::Array>();
v8::Local<v8::Value> matchOffset;
if (!result->Get(context, toV8StringInternalized(isolate, "index")).ToLocal(&matchOffset))
return -1;
if (matchLength) {
v8::Local<v8::Value> match;
if (!result->Get(context, 0).ToLocal(&match))
return -1;
*matchLength = match.As<v8::String>()->Length();
}
return matchOffset.As<v8::Int32>()->Value() + startFrom;
}
} // namespace blink
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