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gecko-dev/js/js2/js2.cpp

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C++
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// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
//
// The contents of this file are subject to the Netscape Public
// License Version 1.1 (the "License"); you may not use this file
// except in compliance with the License. You may obtain a copy of
// the License at http://www.mozilla.org/NPL/
//
// Software distributed under the License is distributed on an "AS
// IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
// implied. See the License for the specific language governing
// rights and limitations under the License.
//
// The Original Code is the JavaScript 2 Prototype.
//
// The Initial Developer of the Original Code is Netscape
// Communications Corporation. Portions created by Netscape are
// Copyright (C) 1998 Netscape Communications Corporation. All
// Rights Reserved.
//
// JS2 shell.
//
#if 1
#define DEBUGGER_FOO
#define INTERPRET_INPUT
#else
#undef DEBUGGER_FOO
#undef INTERPRET_INPUT
#endif
#include <assert.h>
#include "world.h"
#include "interpreter.h"
#include "icodegenerator.h"
#ifdef DEBUGGER_FOO
#include "debugger.h"
#endif
#if defined(XP_MAC) && !defined(XP_MAC_MPW)
#include <SIOUX.h>
#include <MacTypes.h>
static char *mac_argv[] = {"js2", 0};
static void initConsole(StringPtr consoleName,
const char* startupMessage,
int &argc, char **&argv)
{
SIOUXSettings.autocloseonquit = false;
SIOUXSettings.asktosaveonclose = false;
SIOUXSetTitle(consoleName);
// Set up a buffer for stderr (otherwise it's a pig).
static char buffer[BUFSIZ];
setvbuf(stderr, buffer, _IOLBF, BUFSIZ);
JavaScript::stdOut << startupMessage;
argc = 1;
argv = mac_argv;
}
#endif
namespace JavaScript {
namespace Shell {
using namespace ICG;
using namespace JSTypes;
using namespace Interpreter;
// Interactively read a line from the input stream in and put it into
// s. Return false if reached the end of input before reading anything.
static bool promptLine(LineReader &inReader, string &s, const char *prompt)
{
if (prompt) {
stdOut << prompt;
#ifdef XP_MAC_MPW
// Print a CR after the prompt because MPW grabs the entire
// line when entering an interactive command.
stdOut << '\n';
#endif
}
return inReader.readLine(s) != 0;
}
World world;
/* "filename" of the console */
const String ConsoleName = widenCString("<console>");
const bool showTokens = false;
#ifdef DEBUGGER_FOO
Reader *sourceReader; /* Reader for console file */
static
const Reader *ResolveFile (const String& fileName)
{
if (fileName == ConsoleName)
return sourceReader;
else
{
stdErr << "Could not locate source for file '" << fileName << "'\n";
return 0;
}
}
JavaScript::Debugger::Shell jsd(world, stdin, JavaScript::stdOut,
JavaScript::stdOut, &ResolveFile);
#endif
static JSValue print(Context *, const JSValues &argv)
{
size_t n = argv.size();
if (n > 1) { // the 'this' parameter is un-interesting
stdOut << argv[1];
for (size_t i = 2; i < n; ++i)
stdOut << ' ' << argv[i];
}
stdOut << "\n";
return kUndefinedValue;
}
static JSValue dump(Context *, const JSValues &argv)
{
size_t n = argv.size();
if (n > 1) { // the 'this' parameter is un-interesting
if (argv[1].isFunction()) {
JSFunction *f = static_cast<JSFunction *>(argv[1].function);
if (f->isNative())
stdOut << "Native function";
else
stdOut << *f->getICode();
}
else
stdOut << "Not a function";
}
stdOut << "\n";
return kUndefinedValue;
}
inline char narrow(char16 ch) { return char(ch); }
static JSValue load(Context *cx, const JSValues &argv)
{
JSValue result;
size_t n = argv.size();
if (n > 1) {
for (size_t i = 1; i < n; ++i) {
JSValue val = argv[i].toString();
if (val.isString()) {
JSString& fileName = *val.string;
std::string str(fileName.length(), char());
std::transform(fileName.begin(), fileName.end(), str.begin(), narrow);
FILE* f = fopen(str.c_str(), "r");
if (f) {
result = cx->readEvalFile(f, fileName);
fclose(f);
}
}
}
}
return result;
}
static JSValue loadxml(Context *cx, const JSValues &argv)
{
JSValue result;
size_t n = argv.size();
if (n > 1) {
for (size_t i = 1; i < n; ++i) {
JSValue val = argv[i].toString();
if (val.isString()) {
JSString& fileName = *val.string;
std::string str(fileName.length(), char());
std::transform(fileName.begin(), fileName.end(), str.begin(), narrow);
ICodeModule *icm = cx->loadClass(str.c_str());
if (icm)
result = JSValue(new JSFunction(icm));
}
}
}
return result;
}
static bool goGeorge = false;
static JSValue george(Context *, const JSValues &)
{
goGeorge = !goGeorge;
return JSValue(new JSString(goGeorge ? "George is going" : "George is taking a break"));
}
#if 0 // need a XP version of this, rip off from Monkey?
#include <sys/timeb.h>
static JSValue time(Context *cx, const JSValues &argv)
{
struct _timeb timebuffer;
_ftime(&timebuffer);
return JSValue((double)timebuffer.time * 1000 + timebuffer.millitm);
}
#endif
/**
* Poor man's instruction tracing facility.
*/
class Tracer : public Context::Listener {
typedef InstructionStream::difference_type InstructionOffset;
void listen(Context* context, Context::Event event)
{
if (goGeorge && (event & Context::EV_STEP)) {
ICodeModule *iCode = context->getICode();
JSValues &registers = context->getRegisters();
InstructionIterator pc = context->getPC();
InstructionOffset offset = (pc - iCode->its_iCode->begin());
printFormat(stdOut, "trace [%02u:%04u]: ",
iCode->mID, offset);
Instruction* i = *pc;
stdOut << *i;
if (i->op() != BRANCH && i->count() > 0) {
stdOut << " [";
i->printOperands(stdOut, registers);
stdOut << "]\n";
} else {
stdOut << '\n';
}
}
}
};
#define HAVE_GEORGE_TRACE_IT
//#define TEST_XML_LOADER
static void readEvalPrint(FILE *in, World &world)
{
JSScope global;
Context cx(world, &global);
#ifdef DEBUGGER_FOO
jsd.attachToContext (&cx);
#endif
global.defineNativeFunction(world.identifiers["print"], print);
global.defineNativeFunction(world.identifiers["dump"], dump);
global.defineNativeFunction(world.identifiers["load"], load);
global.defineNativeFunction(world.identifiers["loadxml"], loadxml);
global.defineNativeFunction(world.identifiers["george"], george);
// global.defineNativeFunction(world.identifiers["time"], time);
String buffer;
string line;
LineReader inReader(in);
#ifdef HAVE_GEORGE_TRACE_IT
Tracer *george = new Tracer();
cx.addListener(george);
#endif
#ifdef TEST_XML_LOADER
cx.loadClass("class.xml");
#endif
while (promptLine(inReader, line, buffer.empty() ? "js> " : "> ")) {
appendChars(buffer, line.data(), line.size());
try {
Arena a;
Parser p(world, a, buffer, ConsoleName);
if (showTokens) {
Lexer &l = p.lexer;
while (true) {
const Token &t = l.get(true);
if (t.hasKind(Token::end))
break;
stdOut << ' ';
t.print(stdOut, true);
}
stdOut << '\n';
} else {
StmtNode *parsedStatements = p.parseProgram();
ASSERT(p.lexer.peek(true).hasKind(Token::end));
{
PrettyPrinter f(stdOut, 30);
{
PrettyPrinter::Block b(f, 2);
f << "Program =";
f.linearBreak(1);
StmtNode::printStatements(f, parsedStatements);
}
f.end();
}
stdOut << '\n';
#ifdef INTERPRET_INPUT
#ifdef DEBUGGER_FOO
sourceReader = &(p.lexer.reader);
#endif
// Generate code for parsedStatements, which is a linked
// list of zero or more statements
ICodeModule* icm = cx.genCode(parsedStatements, ConsoleName);
if (icm) {
#ifdef SHOW_ICODE
stdOut << *icm;
#endif
JSValue result = cx.interpret(icm, JSValues());
stdOut << "result = " << result << "\n";
delete icm;
}
#endif
}
clear(buffer);
} catch (Exception &e) {
/* If we got a syntax error on the end of input,
* then wait for a continuation
* of input rather than printing the error message. */
if (!(e.hasKind(Exception::syntaxError) &&
e.lineNum && e.pos == buffer.size() &&
e.sourceFile == ConsoleName)) {
stdOut << '\n' << e.fullMessage();
clear(buffer);
}
}
}
stdOut << '\n';
}
//#define HAVE_GEORGE_TRACE_IT
char * tests[] = {
#ifdef NEW_PARSER
"function f(a,b,|'x' 'y' c=0) { return a+b+c; } print(f(1,2,x:3), 'should be 6'); return;",
#endif
"function fact(n) { if (n > 1) return n * fact(n-1); else return 1; } print(fact(6), \" should be 720\"); return;" ,
"a = { f1: 1, f2: 2}; print(a.f2++, \" should be 2\"); print(a.f2 <<= 1, \" should be 6\"); return;" ,
"class A { static var b = 3; static function s() { return b++; }function x() { return \"Ax\"; } function y() { return \"Ay\"; } } var a:A = new A; print(a.s(), \" should be 3\"); print(A.b, \" should be 4\"); return;",
"class B extends A { function x() { return \"Bx\"; } } var b:B = new B; print(b.x(), \" should be Bx\"); print(b.y(), \" should be Ay\"); return;"
};
static void testCompile()
{
JSScope glob;
Context cx(world, &glob);
#ifdef HAVE_GEORGE_TRACE_IT
Tracer *george = new Tracer();
cx.addListener(george);
#endif
glob.defineNativeFunction(world.identifiers["print"], print);
for (uint i = 0; i < sizeof(tests) / sizeof(char *); i++) {
String testScript = widenCString(tests[i]);
Arena a;
Parser p(world, a, testScript, widenCString("testCompile"));
StmtNode *parsedStatements = p.parseProgram();
ICodeGenerator icg(&cx, NULL, NULL, ICodeGenerator::kIsTopLevel, &Void_Type);
StmtNode *s = parsedStatements;
while (s) {
icg.genStmt(s);
s = s->next;
}
JSValue result = cx.interpret(icg.complete(), JSValues());
stdOut << "result = " << result << "\n";
}
}
} /* namespace Shell */
} /* namespace JavaScript */
#if defined(XP_MAC) && !defined(XP_MAC_MPW)
int main(int argc, char **argv)
{
initConsole("\pJavaScript Shell", "Welcome to the js2 shell.\n", argc, argv);
#else
int main(int , char **)
{
#endif
using namespace JavaScript;
using namespace Shell;
#if 1
testCompile();
#endif
readEvalPrint(stdin, world);
return 0;
// return ProcessArgs(argv + 1, argc - 1);
}
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