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/********************* */
/*! \file interactive_shell.cpp
** \verbatim
** Original author: cconway
** Major contributors:
** Minor contributors (to current version):
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010 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/parser.h"
#include "parser/parser_builder.h"
using namespace std;
namespace CVC4 {
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;
/* If we hit EOF, we're done. */
if( d_in.eof() ) {
input += line;
break;
}
/* Check for failure */
if( d_in.fail() ) {
/* This should only happen if the input line was empty. */
Assert( line.empty() );
d_in.clear();
}
/* Extract the newline delimiter from the stream too */
int c = d_in.get();
Assert( c == '\n' );
// cout << "Next char is '" << (char)c << "'" << endl << flush;
/* Strip trailing whitespace. */
int n = line.length() - 1;
while( !line.empty() && isspace(line[n]) ) {
line.erase(n,1);
n--;
}
input += line;
/* If the last char was a backslash, continue on the next line. */
if( !line.empty() && line[n] == '\\' ) {
n = input.length() - 1;
Assert( input[n] == '\\' );
input[n] = '\n';
d_out << "... > " << flush;
} else {
/* No continuation, we're done. */
//cout << "Leaving input loop." << endl << flush;
break;
}
}
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 = parser->nextCommand()) ) {
cmd_seq->addCommand(cmd);
}
delete d_lastParser;
d_lastParser = parser;
return cmd_seq;
}
} // CVC4 namespace
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