Remove lineprocessor sample.
This sample used to demonstrate the usage of the DebuggerAgent. The latter has been removed, so this sample has no point anymore. R=ulan@chromium.org Review URL: https://codereview.chromium.org/754043002 Cr-Commit-Position: refs/heads/master@{#25488}
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@ -1,385 +0,0 @@
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// Copyright 2012 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <include/v8.h>
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#include <include/libplatform/libplatform.h>
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#include <include/v8-debug.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/**
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* This sample program should demonstrate certain aspects of debugging
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* standalone V8-based application.
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*
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* The program reads input stream, processes it line by line and print
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* the result to output. The actual processing is done by custom JavaScript
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* script. The script is specified with command line parameters.
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*
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* The main cycle of the program will sequentially read lines from standard
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* input, process them and print to standard output until input closes.
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* There are 2 possible configuration in regard to main cycle.
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*
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* 1. The main cycle is on C++ side. Program should be run with
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* --main-cycle-in-cpp option. Script must declare a function named
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* "ProcessLine". The main cycle in C++ reads lines and calls this function
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* for processing every time. This is a sample script:
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function ProcessLine(input_line) {
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return ">>>" + input_line + "<<<";
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}
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*
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* 2. The main cycle is in JavaScript. Program should be run with
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* --main-cycle-in-js option. Script gets run one time at all and gets
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* API of 2 global functions: "read_line" and "print". It should read input
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* and print converted lines to output itself. This a sample script:
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while (true) {
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var line = read_line();
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if (!line) {
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break;
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}
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var res = line + " | " + line;
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print(res);
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}
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*/
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enum MainCycleType {
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CycleInCpp,
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CycleInJs
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};
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const char* ToCString(const v8::String::Utf8Value& value);
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void ReportException(v8::Isolate* isolate, v8::TryCatch* handler);
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v8::Handle<v8::String> ReadFile(v8::Isolate* isolate, const char* name);
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v8::Handle<v8::String> ReadLine();
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void Print(const v8::FunctionCallbackInfo<v8::Value>& args);
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void ReadLine(const v8::FunctionCallbackInfo<v8::Value>& args);
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bool RunCppCycle(v8::Handle<v8::Script> script,
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v8::Local<v8::Context> context,
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bool report_exceptions);
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v8::Persistent<v8::Context> debug_message_context;
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int RunMain(int argc, char* argv[]) {
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v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
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v8::Isolate* isolate = v8::Isolate::New();
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v8::Isolate::Scope isolate_scope(isolate);
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v8::HandleScope handle_scope(isolate);
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v8::Handle<v8::String> script_source;
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v8::Handle<v8::Value> script_name;
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int script_param_counter = 0;
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MainCycleType cycle_type = CycleInCpp;
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for (int i = 1; i < argc; i++) {
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const char* str = argv[i];
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if (strcmp(str, "-f") == 0) {
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// Ignore any -f flags for compatibility with the other stand-
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// alone JavaScript engines.
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continue;
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} else if (strcmp(str, "--main-cycle-in-cpp") == 0) {
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cycle_type = CycleInCpp;
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} else if (strcmp(str, "--main-cycle-in-js") == 0) {
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cycle_type = CycleInJs;
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} else if (strncmp(str, "--", 2) == 0) {
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printf("Warning: unknown flag %s.\nTry --help for options\n", str);
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} else if (strcmp(str, "-e") == 0 && i + 1 < argc) {
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script_source = v8::String::NewFromUtf8(isolate, argv[i + 1]);
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script_name = v8::String::NewFromUtf8(isolate, "unnamed");
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i++;
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script_param_counter++;
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} else {
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// Use argument as a name of file to load.
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script_source = ReadFile(isolate, str);
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script_name = v8::String::NewFromUtf8(isolate, str);
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if (script_source.IsEmpty()) {
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printf("Error reading '%s'\n", str);
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return 1;
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}
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script_param_counter++;
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}
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}
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if (script_param_counter == 0) {
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printf("Script is not specified\n");
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return 1;
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}
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if (script_param_counter != 1) {
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printf("Only one script may be specified\n");
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return 1;
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}
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// Create a template for the global object.
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v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New(isolate);
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// Bind the global 'print' function to the C++ Print callback.
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global->Set(v8::String::NewFromUtf8(isolate, "print"),
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v8::FunctionTemplate::New(isolate, Print));
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if (cycle_type == CycleInJs) {
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// Bind the global 'read_line' function to the C++ Print callback.
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global->Set(v8::String::NewFromUtf8(isolate, "read_line"),
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v8::FunctionTemplate::New(isolate, ReadLine));
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}
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// Create a new execution environment containing the built-in
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// functions
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v8::Handle<v8::Context> context = v8::Context::New(isolate, NULL, global);
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// Enter the newly created execution environment.
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v8::Context::Scope context_scope(context);
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debug_message_context.Reset(isolate, context);
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bool report_exceptions = true;
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v8::Handle<v8::Script> script;
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{
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// Compile script in try/catch context.
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v8::TryCatch try_catch;
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v8::ScriptOrigin origin(script_name);
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script = v8::Script::Compile(script_source, &origin);
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if (script.IsEmpty()) {
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// Print errors that happened during compilation.
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if (report_exceptions)
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ReportException(isolate, &try_catch);
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return 1;
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}
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}
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{
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v8::TryCatch try_catch;
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script->Run();
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if (try_catch.HasCaught()) {
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if (report_exceptions)
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ReportException(isolate, &try_catch);
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return 1;
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}
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}
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if (cycle_type == CycleInCpp) {
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bool res = RunCppCycle(script,
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isolate->GetCurrentContext(),
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report_exceptions);
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return !res;
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} else {
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// All is already done.
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}
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return 0;
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}
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bool RunCppCycle(v8::Handle<v8::Script> script,
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v8::Local<v8::Context> context,
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bool report_exceptions) {
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v8::Isolate* isolate = context->GetIsolate();
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v8::Handle<v8::String> fun_name =
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v8::String::NewFromUtf8(isolate, "ProcessLine");
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v8::Handle<v8::Value> process_val = context->Global()->Get(fun_name);
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// If there is no Process function, or if it is not a function,
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// bail out
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if (!process_val->IsFunction()) {
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printf("Error: Script does not declare 'ProcessLine' global function.\n");
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return 1;
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}
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// It is a function; cast it to a Function
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v8::Handle<v8::Function> process_fun =
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v8::Handle<v8::Function>::Cast(process_val);
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while (!feof(stdin)) {
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v8::HandleScope handle_scope(isolate);
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v8::Handle<v8::String> input_line = ReadLine();
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if (input_line == v8::Undefined(isolate)) {
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continue;
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}
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const int argc = 1;
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v8::Handle<v8::Value> argv[argc] = { input_line };
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v8::Handle<v8::Value> result;
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{
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v8::TryCatch try_catch;
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result = process_fun->Call(isolate->GetCurrentContext()->Global(),
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argc, argv);
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if (try_catch.HasCaught()) {
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if (report_exceptions)
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ReportException(isolate, &try_catch);
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return false;
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}
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}
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v8::String::Utf8Value str(result);
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const char* cstr = ToCString(str);
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printf("%s\n", cstr);
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}
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return true;
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}
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int main(int argc, char* argv[]) {
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v8::V8::InitializeICU();
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v8::Platform* platform = v8::platform::CreateDefaultPlatform();
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v8::V8::InitializePlatform(platform);
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v8::V8::Initialize();
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int result = RunMain(argc, argv);
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v8::V8::Dispose();
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v8::V8::ShutdownPlatform();
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delete platform;
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return result;
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}
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// Extracts a C string from a V8 Utf8Value.
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const char* ToCString(const v8::String::Utf8Value& value) {
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return *value ? *value : "<string conversion failed>";
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}
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// Reads a file into a v8 string.
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v8::Handle<v8::String> ReadFile(v8::Isolate* isolate, const char* name) {
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FILE* file = fopen(name, "rb");
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if (file == NULL) return v8::Handle<v8::String>();
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fseek(file, 0, SEEK_END);
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int size = ftell(file);
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rewind(file);
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char* chars = new char[size + 1];
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chars[size] = '\0';
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for (int i = 0; i < size;) {
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int read = static_cast<int>(fread(&chars[i], 1, size - i, file));
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i += read;
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}
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fclose(file);
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v8::Handle<v8::String> result =
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v8::String::NewFromUtf8(isolate, chars, v8::String::kNormalString, size);
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delete[] chars;
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return result;
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}
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void ReportException(v8::Isolate* isolate, v8::TryCatch* try_catch) {
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v8::HandleScope handle_scope(isolate);
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v8::String::Utf8Value exception(try_catch->Exception());
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const char* exception_string = ToCString(exception);
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v8::Handle<v8::Message> message = try_catch->Message();
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if (message.IsEmpty()) {
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// V8 didn't provide any extra information about this error; just
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// print the exception.
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printf("%s\n", exception_string);
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} else {
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// Print (filename):(line number): (message).
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v8::String::Utf8Value filename(message->GetScriptOrigin().ResourceName());
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const char* filename_string = ToCString(filename);
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int linenum = message->GetLineNumber();
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printf("%s:%i: %s\n", filename_string, linenum, exception_string);
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// Print line of source code.
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v8::String::Utf8Value sourceline(message->GetSourceLine());
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const char* sourceline_string = ToCString(sourceline);
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printf("%s\n", sourceline_string);
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// Print wavy underline (GetUnderline is deprecated).
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int start = message->GetStartColumn();
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for (int i = 0; i < start; i++) {
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printf(" ");
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}
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int end = message->GetEndColumn();
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for (int i = start; i < end; i++) {
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printf("^");
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}
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printf("\n");
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}
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}
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// The callback that is invoked by v8 whenever the JavaScript 'print'
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// function is called. Prints its arguments on stdout separated by
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// spaces and ending with a newline.
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void Print(const v8::FunctionCallbackInfo<v8::Value>& args) {
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bool first = true;
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for (int i = 0; i < args.Length(); i++) {
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v8::HandleScope handle_scope(args.GetIsolate());
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if (first) {
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first = false;
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} else {
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printf(" ");
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}
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v8::String::Utf8Value str(args[i]);
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const char* cstr = ToCString(str);
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printf("%s", cstr);
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}
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printf("\n");
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fflush(stdout);
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}
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// The callback that is invoked by v8 whenever the JavaScript 'read_line'
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// function is called. Reads a string from standard input and returns.
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void ReadLine(const v8::FunctionCallbackInfo<v8::Value>& args) {
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if (args.Length() > 0) {
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args.GetIsolate()->ThrowException(
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v8::String::NewFromUtf8(args.GetIsolate(), "Unexpected arguments"));
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return;
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}
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args.GetReturnValue().Set(ReadLine());
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}
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v8::Handle<v8::String> ReadLine() {
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const int kBufferSize = 1024 + 1;
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char buffer[kBufferSize];
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char* res;
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{
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res = fgets(buffer, kBufferSize, stdin);
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}
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v8::Isolate* isolate = v8::Isolate::GetCurrent();
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if (res == NULL) {
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v8::Handle<v8::Primitive> t = v8::Undefined(isolate);
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return v8::Handle<v8::String>::Cast(t);
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}
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// Remove newline char
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for (char* pos = buffer; *pos != '\0'; pos++) {
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if (*pos == '\n') {
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*pos = '\0';
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break;
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}
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}
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return v8::String::NewFromUtf8(isolate, buffer);
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}
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@ -67,11 +67,5 @@
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'process.cc',
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],
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},
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{
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'target_name': 'lineprocessor',
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'sources': [
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'lineprocessor.cc',
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],
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}
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],
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}
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