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// Copyright 2016 the V8 project 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 "src/inspector/v8-regex.h"
#include <limits.h>
#include "src/inspector/string-util.h"
#include "src/inspector/v8-inspector-impl.h"
#include "include/v8-inspector.h"
namespace v8_inspector {
V8Regex::V8Regex(V8InspectorImpl* inspector, const String16& pattern,
bool caseSensitive, bool multiline)
: m_inspector(inspector) {
v8::Isolate* isolate = m_inspector->isolate();
v8::HandleScope handleScope(isolate);
v8::Local<v8::Context> context;
if (!m_inspector->regexContext().ToLocal(&context)) {
DCHECK(isolate->IsExecutionTerminating());
m_errorMessage = "terminated";
return;
}
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);
else if (tryCatch.HasCaught())
m_errorMessage = toProtocolString(isolate, tryCatch.Message()->Get());
else
m_errorMessage = "Internal error";
}
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_inspector->isolate();
v8::HandleScope handleScope(isolate);
v8::Local<v8::Context> context;
if (!m_inspector->regexContext().ToLocal(&context)) {
DCHECK(isolate->IsExecutionTerminating());
return -1;
}
v8::Context::Scope contextScope(context);
v8::MicrotasksScope microtasks(isolate,
v8::MicrotasksScope::kDoNotRunMicrotasks);
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 (!exec.As<v8::Function>()
->Call(context, regex, arraysize(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
DCHECK(!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 v8_inspector
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