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/********************* */
/*! \file interactive_shell.cpp
** \verbatim
** Original author: cconway
** Major contributors: none
** Minor contributors (to current version): none
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010, 2011 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief Interactive shell for CVC4
**/
#include <iostream>
#include "interactive_shell.h"
#include "expr/command.h"
#include "parser/input.h"
#include "parser/parser.h"
#include "parser/parser_builder.h"
#include "util/options.h"
using namespace std;
namespace CVC4 {
using namespace parser;
const string InteractiveShell::INPUT_FILENAME = "<shell>";
InteractiveShell::InteractiveShell(ExprManager& exprManager,
const Options& options) :
d_in(*options.in),
d_out(*options.out),
d_language(options.inputLanguage) {
ParserBuilder parserBuilder(exprManager,INPUT_FILENAME,options);
/* Create parser with bogus input. */
d_parser = parserBuilder.withStringInput("").build();
}
Command* InteractiveShell::readCommand() {
/* Don't do anything if the input is closed. */
if( d_in.eof() ) {
return NULL;
}
/* If something's wrong with the input, there's nothing we can do. */
if( !d_in.good() ) {
throw ParserException("Interactive input broken.");
}
string input;
/* Prompt the user for input. */
d_out << "CVC4> " << flush;
while(true) {
stringbuf sb;
string line;
/* Read a line */
d_in.get(sb,'\n');
line = sb.str();
// cout << "Input was '" << input << "'" << endl << flush;
Assert( !(d_in.fail() && !d_in.eof()) || line.empty() );
/* Check for failure. */
if( d_in.fail() && !d_in.eof() ) {
/* This should only happen if the input line was empty. */
Assert( line.empty() );
d_in.clear();
}
/* Strip trailing whitespace. */
int n = line.length() - 1;
while( !line.empty() && isspace(line[n]) ) {
line.erase(n,1);
n--;
}
/* If we hit EOF, we're done. */
if( d_in.eof() ) {
input += line;
if( input.empty() ) {
/* Nothing left to parse. */
return NULL;
}
/* Some input left to parse, but nothing left to read.
Jump out of input loop. */
break;
}
/* Extract the newline delimiter from the stream too */
int c CVC4_UNUSED = d_in.get();
Assert( c == '\n' );
// cout << "Next char is '" << (char)c << "'" << endl << flush;
input += line;
/* If the last char was a backslash, continue on the next line. */
n = input.length() - 1;
if( !line.empty() && input[n] == '\\' ) {
input[n] = '\n';
d_out << "... > " << flush;
} else {
/* No continuation, we're done. */
//cout << "Leaving input loop." << endl << flush;
break;
}
}
d_parser->setInput(Input::newStringInput(d_language,input,INPUT_FILENAME));
// Parser *parser =
// d_parserBuilder
// .withStringInput(input)
// .withStateFrom(d_lastParser)
// .build();
/* There may be more than one command in the input. Build up a
sequence. */
CommandSequence *cmd_seq = new CommandSequence();
Command *cmd;
while( (cmd = d_parser->nextCommand()) ) {
cmd_seq->addCommand(cmd);
}
// if( d_lastParser ) {
// delete d_lastParser;
// }
// d_lastParser = parser;
return cmd_seq;
}
} // CVC4 namespace
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