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303 lines
10 KiB
303 lines
10 KiB
// Copyright 2009 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 <v8.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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void RunShell(v8::Handle<v8::Context> context);
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bool ExecuteString(v8::Handle<v8::String> source,
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v8::Handle<v8::Value> name,
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bool print_result,
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bool report_exceptions);
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v8::Handle<v8::Value> Print(const v8::Arguments& args);
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v8::Handle<v8::Value> Read(const v8::Arguments& args);
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v8::Handle<v8::Value> Load(const v8::Arguments& args);
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v8::Handle<v8::Value> Quit(const v8::Arguments& args);
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v8::Handle<v8::Value> Version(const v8::Arguments& args);
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v8::Handle<v8::String> ReadFile(const char* name);
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void ReportException(v8::TryCatch* handler);
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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::HandleScope handle_scope;
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// Create a template for the global object.
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v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New();
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// Bind the global 'print' function to the C++ Print callback.
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global->Set(v8::String::New("print"), v8::FunctionTemplate::New(Print));
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// Bind the global 'read' function to the C++ Read callback.
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global->Set(v8::String::New("read"), v8::FunctionTemplate::New(Read));
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// Bind the global 'load' function to the C++ Load callback.
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global->Set(v8::String::New("load"), v8::FunctionTemplate::New(Load));
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// Bind the 'quit' function
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global->Set(v8::String::New("quit"), v8::FunctionTemplate::New(Quit));
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// Bind the 'version' function
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global->Set(v8::String::New("version"), v8::FunctionTemplate::New(Version));
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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(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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bool run_shell = (argc == 1);
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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, "--shell") == 0) {
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run_shell = true;
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} else 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 (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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// Execute argument given to -e option directly
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v8::HandleScope handle_scope;
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v8::Handle<v8::String> file_name = v8::String::New("unnamed");
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v8::Handle<v8::String> source = v8::String::New(argv[i + 1]);
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if (!ExecuteString(source, file_name, false, true))
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return 1;
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i++;
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} else {
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// Use all other arguments as names of files to load and run.
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v8::HandleScope handle_scope;
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v8::Handle<v8::String> file_name = v8::String::New(str);
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v8::Handle<v8::String> source = ReadFile(str);
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if (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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if (!ExecuteString(source, file_name, false, true))
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return 1;
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}
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}
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if (run_shell) RunShell(context);
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return 0;
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}
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int main(int argc, char* argv[]) {
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int result = RunMain(argc, argv);
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v8::V8::Dispose();
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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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// 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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v8::Handle<v8::Value> Print(const v8::Arguments& 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;
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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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return v8::Undefined();
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}
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// The callback that is invoked by v8 whenever the JavaScript 'read'
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// function is called. This function loads the content of the file named in
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// the argument into a JavaScript string.
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v8::Handle<v8::Value> Read(const v8::Arguments& args) {
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if (args.Length() != 1) {
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return v8::ThrowException(v8::String::New("Bad parameters"));
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}
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v8::String::Utf8Value file(args[0]);
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if (*file == NULL) {
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return v8::ThrowException(v8::String::New("Error loading file"));
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}
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v8::Handle<v8::String> source = ReadFile(*file);
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if (source.IsEmpty()) {
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return v8::ThrowException(v8::String::New("Error loading file"));
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}
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return source;
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}
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// The callback that is invoked by v8 whenever the JavaScript 'load'
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// function is called. Loads, compiles and executes its argument
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// JavaScript file.
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v8::Handle<v8::Value> Load(const v8::Arguments& args) {
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for (int i = 0; i < args.Length(); i++) {
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v8::HandleScope handle_scope;
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v8::String::Utf8Value file(args[i]);
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if (*file == NULL) {
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return v8::ThrowException(v8::String::New("Error loading file"));
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}
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v8::Handle<v8::String> source = ReadFile(*file);
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if (source.IsEmpty()) {
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return v8::ThrowException(v8::String::New("Error loading file"));
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}
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if (!ExecuteString(source, v8::String::New(*file), false, false)) {
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return v8::ThrowException(v8::String::New("Error executing file"));
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}
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}
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return v8::Undefined();
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}
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// The callback that is invoked by v8 whenever the JavaScript 'quit'
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// function is called. Quits.
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v8::Handle<v8::Value> Quit(const v8::Arguments& args) {
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// If not arguments are given args[0] will yield undefined which
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// converts to the integer value 0.
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int exit_code = args[0]->Int32Value();
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exit(exit_code);
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return v8::Undefined();
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}
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v8::Handle<v8::Value> Version(const v8::Arguments& args) {
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return v8::String::New(v8::V8::GetVersion());
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}
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// Reads a file into a v8 string.
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v8::Handle<v8::String> ReadFile(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 = 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 = v8::String::New(chars, size);
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delete[] chars;
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return result;
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}
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// The read-eval-execute loop of the shell.
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void RunShell(v8::Handle<v8::Context> context) {
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printf("V8 version %s\n", v8::V8::GetVersion());
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static const int kBufferSize = 256;
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while (true) {
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char buffer[kBufferSize];
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printf("> ");
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char* str = fgets(buffer, kBufferSize, stdin);
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if (str == NULL) break;
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v8::HandleScope handle_scope;
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ExecuteString(v8::String::New(str),
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v8::String::New("(shell)"),
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true,
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true);
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}
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printf("\n");
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}
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// Executes a string within the current v8 context.
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bool ExecuteString(v8::Handle<v8::String> source,
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v8::Handle<v8::Value> name,
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bool print_result,
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bool report_exceptions) {
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v8::HandleScope handle_scope;
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v8::TryCatch try_catch;
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v8::Handle<v8::Script> script = v8::Script::Compile(source, name);
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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(&try_catch);
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return false;
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} else {
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v8::Handle<v8::Value> result = script->Run();
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if (result.IsEmpty()) {
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// Print errors that happened during execution.
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if (report_exceptions)
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ReportException(&try_catch);
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return false;
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} else {
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if (print_result && !result->IsUndefined()) {
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// If all went well and the result wasn't undefined then print
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// the returned value.
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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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}
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}
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void ReportException(v8::TryCatch* try_catch) {
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v8::HandleScope handle_scope;
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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->GetScriptResourceName());
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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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