cppcheck/token.cpp

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/*
* cppcheck - c/c++ syntax checking
* Copyright (C) 2007-2008 Daniel Marjamäki, Reijo Tomperi, Nicolas Le Cam
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*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/
*/
#include "token.h"
#include <cstdlib>
#include <cstring>
#include <string>
#include <iostream>
#ifdef __BORLANDC__
#include <ctype.h> // isalpha, isdigit
#endif
TOKEN::TOKEN()
{
_fileIndex = 0;
_cstr = 0;
_str = "";
_linenr = 0;
_next = 0;
_previous = 0;
_varId = 0;
_isName = false;
_isNumber = false;
}
TOKEN::~TOKEN()
{
std::free(_cstr);
}
void TOKEN::setstr( const char s[] )
{
_str = s;
std::free(_cstr);
#ifndef _MSC_VER
_cstr = strdup(s);
#else
_cstr = _strdup(s);
#endif
_isName = bool(_str[0]=='_' || isalpha(_str[0]));
_isNumber = bool(isdigit(_str[0]) != 0);
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_varId = 0;
}
void TOKEN::combineWithNext(const char str1[], const char str2[])
{
if (!(_next))
return;
if (_str!=str1 || _next->_str!=str2)
return;
std::string newstr(std::string(str1) + std::string(str2));
setstr( newstr.c_str() );
deleteNext();
}
void TOKEN::deleteNext()
{
TOKEN *n = _next;
_next = n->next();
delete n;
if (_next)
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_next->previous(this);
}
const TOKEN *TOKEN::tokAt(int index) const
{
const TOKEN *tok = this;
while (index>0 && tok)
{
tok = tok->next();
index--;
}
return tok;
}
const char *TOKEN::strAt(int index) const
{
const TOKEN *tok = this->tokAt(index);
return tok ? tok->_cstr : "";
}
int TOKEN::multiCompare( const char *needle, const char *haystack )
{
bool emptyStringFound = false;
bool findNextOr = false;
const char *haystackPointer = haystack;
for( ; *needle; ++needle )
{
if( *needle == '|' )
{
// If needle and haystack are both at the end, we have a match.
if( *haystackPointer == 0 )
return 1;
haystackPointer = haystack;
if( findNextOr )
findNextOr = false;
else
emptyStringFound = true;
continue;
}
if( findNextOr )
continue;
// If haystack and needle don't share the same character, reset
// haystackpointer and find next '|' character.
if( *haystackPointer != *needle )
{
haystackPointer = haystack;
findNextOr = true;
continue;
}
// All characters in haystack and needle have matched this far
haystackPointer++;
}
// If both needle and haystack are at the end, then we have a match.
if( *haystackPointer == 0 )
return 1;
// If empty string was found or if last character in needle was '|'
if( emptyStringFound || findNextOr == false )
return 0;
return -1;
}
bool TOKEN::Match(const TOKEN *tok, const char pattern[], const char *varname1[], const char *varname2[], unsigned int varid)
{
const char *p = pattern;
while ( *p )
{
// Skip spaces in pattern..
while ( *p == ' ' )
p++;
if (!tok)
{
// If we have no tokens, pattern "!!else" should return true
if( isNotPattern( p ) )
return true;
else
return false;
}
// Extract token from pattern..
// TODO: Refactor this so there can't be buffer overflows
char str[500];
char *s = str;
while (*p && *p!=' ')
{
*s = *p;
s++;
p++;
}
*s = 0;
// No token => Success!
if (str[0] == 0)
return true;
bool useVar1;
// Any symbolname..
if (strcmp(str,"%var%")==0 || strcmp(str,"%type%")==0)
{
if (!tok->isName())
return false;
}
// Accept any token
else if (strcmp(str,"%any%")==0 )
{
}
// Variable name..
else if ((useVar1 = (strcmp(str,"%var1%")==0)) || strcmp(str,"%var2%")==0)
{
const char **varname = useVar1 ? varname1 : varname2;
if ( ! varname )
return false;
if (tok->_str != varname[0])
return false;
for ( int i = 1; varname[i]; i++ )
{
if ( !(tok->tokAt(2)) )
return false;
if ( strcmp(tok->strAt( 1), ".") )
return false;
if ( strcmp(tok->strAt( 2), varname[i]) )
return false;
tok = tok->tokAt(2);
}
}
else if (strcmp(str,"%varid%")==0)
{
if ( tok->varId() != varid )
return false;
}
else if (strcmp(str,"%num%")==0)
{
if ( ! tok->isNumber() )
return false;
}
else if (strcmp(str,"%str%")==0)
{
if ( tok->_str[0] != '\"' )
return false;
}
// [.. => search for a one-character token..
else if (str[0]=='[' && strchr(str, ']') && tok->_str[1] == 0)
{
*strrchr(str, ']') = 0;
if ( strchr( str + 1, tok->_str[0] ) == 0 )
return false;
}
// Parse multi options, such as void|int|char (accept token which is one of these 3)
else if ( strchr(str, '|') && strlen( str ) > 2 )
{
int res = multiCompare( str, tok->_cstr );
if( res == 0 )
{
// Empty alternative matches, use the same token on next round
continue;
}
else if( res == -1 )
{
// No match
return false;
}
}
// Parse "not" options. Token can be anything except the given one
else if( isNotPattern( str ) )
{
if( strcmp( tok->aaaa(), &(str[2]) ) == 0 )
return false;
}
else if (str != tok->_str)
return false;
tok = tok->next();
}
// The end of the pattern has been reached and nothing wrong has been found
return true;
}
bool TOKEN::isNotPattern( const char *pattern )
{
if( pattern && strlen(pattern) > 2 && pattern[0] == '!' && pattern[1] == '!' )
return true;
else
return false;
}
bool TOKEN::isName() const
{
return _isName;
}
bool TOKEN::isNumber() const
{
return _isNumber;
}
bool TOKEN::isStandardType() const
{
bool ret = false;
const char *type[] = {"bool","char","short","int","long","float","double",0};
for (int i = 0; type[i]; i++)
ret |= (_str == type[i]);
return ret;
}
//---------------------------------------------------------------------------
const TOKEN *TOKEN::findmatch(const TOKEN *tok, const char pattern[], const char *varname1[], const char *varname2[])
{
for ( ; tok; tok = tok->next())
{
if ( TOKEN::Match(tok, pattern, varname1, varname2) )
return tok;
}
return 0;
}
const TOKEN *TOKEN::findtoken(const TOKEN *tok1, const char *tokenstr[])
{
for (const TOKEN *ret = tok1; ret; ret = ret->next())
{
unsigned int i = 0;
const TOKEN *tok = ret;
while (tokenstr[i])
{
if (!tok)
return NULL;
if (*(tokenstr[i]) && (tokenstr[i] != tok->_str))
break;
tok = tok->next();
i++;
}
if (!tokenstr[i])
return ret;
}
return NULL;
}
unsigned int TOKEN::varId() const
{
return _varId;
}
void TOKEN::varId( unsigned int id )
{
_varId = id;
}
TOKEN *TOKEN::next() const
{
return _next;
}
void TOKEN::next( TOKEN *next )
{
_next = next;
}
TOKEN *TOKEN::previous() const
{
return _previous;
}
void TOKEN::previous( TOKEN *previous )
{
_previous = previous;
}
void TOKEN::insertToken( const char str[] )
{
TOKEN *newToken = new TOKEN;
newToken->setstr( str );
newToken->_linenr = _linenr;
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newToken->_fileIndex = _fileIndex;
if( this->next() )
{
newToken->next( this->next() );
newToken->next()->previous( newToken );
}
this->next( newToken );
newToken->previous( this );
}
void TOKEN::eraseTokens( TOKEN *begin, const TOKEN *end )
{
if ( ! begin )
return;
while ( begin->next() && begin->next() != end )
{
begin->deleteNext();
}
}
unsigned int TOKEN::fileIndex() const
{
return _fileIndex;
}
void TOKEN::fileIndex( unsigned int fileIndex )
{
_fileIndex = fileIndex;
}
unsigned int TOKEN::linenr() const
{
return _linenr;
}
void TOKEN::linenr( unsigned int linenr )
{
_linenr = linenr;
}
void TOKEN::printOut( const char *title ) const
{
std::cout << std::endl << "###";
if ( title )
std::cout << " " << title << " ";
else
std::cout << "########";
std::cout << "###" << std::endl;
for( const TOKEN *t = this; t; t = t->next() )
{
std::cout << t->linenr() << ": " << t->str();
if ( t->varId() )
std::cout << " ("<< t->varId() <<")";
std::cout << std::endl;
}
}