/* $Id$
* $Log$
* Revision 1.1 2000/10/31 04:29:50 geraint
* Initial revision
*
*/
#include <iostream>
#include <map>
#include <stack>
#include <string>
/*
* Bracket.hh deals with nesting levels of parenthesis
* just add Bracket pointer to string / stream
*/
#include "Bracket.hh"
/*
* use lbrace, etc. in expressions to automate nesting calculations
*/
LeftBrace *lbrace = new LeftBrace;
RightBrace *rbrace = new RightBrace;
LeftParen *lparen = new LeftParen;
RightParen *rparen = new RightParen;
/*
* use brace nesting depth to determine indentation
*/
string indent (void) { return lbrace->indentation (); }
/*
* map contains keyword to look for and function to call when found
*/
map <string, void (*)(void)> keyword;
/*
* stack records current nest type
* so that "end" can be handled correctly
*/
enum nest_type
{
null,
if_statement,
switch_statement,
while_statement
};
stack <enum nest_type> current_nest;
/*
* assuming cin has '(' as next character
* find the matching ')' and return the string contained within
*/
string get_test (void)
{
const int entry_nesting = lparen->get_nesting_depth ();
char c;
string buf = "";
cin.setf (ios::skipws);
cin >> c;
if ('(' != c)
{
cerr << "Sorry, test must be enclosed in ( )" << endl;
cerr << "current character is " << c << endl;
/*
* replace this with a call to get_expression maybe?
*/
exit (-1);
}
else
{
buf += lparen;
}
cin.unsetf (ios::skipws);
while (entry_nesting != lparen->get_nesting_depth ()) {
cin >> c;
switch (c)
{
case '(':
buf += lparen;
break;
case ')':
buf += rparen;
break;
case EOF:
cerr << "Oops! EOF reached" << endl;
exit (-1);
default:
buf += c;
break;
}
}
return buf;
}
/*
* functions to be called upon detection of keyword
*/
void got_if (void)
{
current_nest.push (if_statement);
cout << "if ";
cout << get_test ();
cout << lbrace;
}
void got_else (void)
{
cout << rbrace;
cout << "else";
cout << lbrace;
}
void got_elseif (void)
{
cout << rbrace;
got_if ();
}
void got_switch (void)
{
current_nest.push (switch_statement);
cout << "switch ";
cout << get_test ();
cout << lbrace;
/*
* open a second brace so that each "case" can be enclosed
*/
cout << lbrace;
}
void got_case (void)
{
cout << rbrace;
cout << "case ";
cout << get_test ();
cout << ':';
cout << lbrace;
}
void got_otherwise (void)
{
cout << rbrace;
cout << "default:";
cout << lbrace;
}
void got_while (void)
{
current_nest.push (while_statement);
cout << "while ";
cout << get_test ();
cout << lbrace;
}
void got_end (void)
{
enum nest_type n = current_nest.top ();
switch (n)
{
case if_statement:
case while_statement:
cout << rbrace;
break;
case switch_statement:
cout << rbrace
<< rbrace;
break;
default:
cerr << "Oops! Unmatched end ... aborting" << endl;
exit (-1);
break;
}
current_nest.pop ();
}
void got_comment (void)
{
/*
* get remainder of line in case there are any commented keywords
*/
char c;
cout << " // ";
cin >> c;
while (c != '\n' && c != EOF)
{
cout << c;
cin >> c;
}
cout << endl
<< indent () << ';' << endl
<< indent ();
}
/*
* map contains keyword to look for and functions to call when found
* functions must be of the form "void f (void) {...;}"
* new structures should also be added to enum nest_type
*/
void set_keyword (void)
{
// if
keyword ["if"] = got_if;
keyword ["else"] = got_else;
keyword ["elseif"] = got_elseif;
keyword ["endif"] = got_end;
// switch
keyword ["switch"] = got_switch;
keyword ["case"] = got_case;
keyword ["otherwise"] = got_otherwise;
keyword ["endswitch"] = got_end;
// while
keyword ["while"] = got_while;
keyword ["endwhile"] = got_end;
// general
keyword ["end"] = got_end;
/*
* this won't work inside a string
* or if there is no space around the delimiter
*/
keyword ["#"] = got_comment;
keyword ["//"] = got_comment;
/*
* unimplemented keywords
*
keyword ["for"] = got_for;
keyword ["endfor"] = got_end;
keyword ["break"] = got_break;
keyword ["continue"] = got_continue;
*/
}
/* read in one character at a time looking for tokens (delimited by whitespace)
* if the token is a keyword, call the appropriate function
*/
int main (void)
{
set_keyword ();
string buf = "";
char c;
cin.unsetf (ios::skipws);
while (cin >> c)
{
switch (c)
{
case EOF:
return 0;
case ' ':
case '\t':
if (keyword [buf])
{
keyword [buf]();
}
else
{
if (! lbrace->get_nesting_depth ())
{
buf += c;
}
cout << buf;
}
buf = "";
break;
case '\n':
if (keyword [buf])
{
/*
* keyword found, call function
*/
keyword [buf] ();
}
else
{
cout << buf
/*
* keep newline in case this line has an EOL-comment
*/
<< endl
/*
* EOL is end-of-statement in Octave, add ;
*/
<< indent () << ';' << endl
<< indent ();
}
buf = "";
break;
default:
buf += c;
}
if (lbrace->get_nesting_depth ())
{
cout.setf (ios::skipws);
}
else
{
cout.unsetf (ios::skipws);
}
}
return 0;
}