[inspector] Initial import of v8_inspector.

src/inspector/V8Regex.cpp

+// 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/V8Regex.h"
+
+#include "src/inspector/StringUtil.h"
+#include "src/inspector/V8Compat.h"
+#include "src/inspector/V8InspectorImpl.h"
+#include "src/inspector/public/V8InspectorClient.h"
+
+#include <limits.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 = m_inspector->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(&regex))
+    m_regex.Reset(isolate, regex);
+  else if (tryCatch.HasCaught())
+    m_errorMessage = toProtocolString(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 = m_inspector->regexContext();
+  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, V8_INSPECTOR_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
+
+  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