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tokenreader.cpp
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//===========================================================================//
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include "tokenreader.h"
#include "tier0/platform.h"
#include "tier1/strtools.h"
#include "tier0/dbg.h"
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
TokenReader::TokenReader(void)
{
m_szFilename[0] = '\0';
m_nLine = 1;
m_nErrorCount = 0;
m_bStuffed = false;
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : *pszFilename -
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool TokenReader::Open(const char *pszFilename)
{
open(pszFilename, std::ios::in | std::ios::binary );
Q_strncpy(m_szFilename, pszFilename, sizeof( m_szFilename ) );
m_nLine = 1;
m_nErrorCount = 0;
m_bStuffed = false;
return(is_open() != 0);
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
void TokenReader::Close()
{
close();
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : *error -
// Output : const char
//-----------------------------------------------------------------------------
const char *TokenReader::Error(char *error, ...)
{
static char szErrorBuf[256];
Q_snprintf(szErrorBuf, sizeof( szErrorBuf ), "File %s, line %d: ", m_szFilename, m_nLine);
Q_strncat(szErrorBuf, error, sizeof( szErrorBuf ), COPY_ALL_CHARACTERS );
m_nErrorCount++;
return(szErrorBuf);
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : pszStore -
// nSize -
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
trtoken_t TokenReader::GetString(char *pszStore, int nSize)
{
if (nSize <= 0)
{
return TOKENERROR;
}
char szBuf[1024];
//
// Until we reach the end of this string or run out of room in
// the destination buffer...
//
while (true)
{
//
// Fetch the next batch of text from the file.
//
get(szBuf, sizeof(szBuf), '\"');
if (eof())
{
return TOKENEOF;
}
if (fail())
{
// Just means nothing was read (empty string probably "")
clear();
}
//
// Transfer the text to the destination buffer.
//
char *pszSrc = szBuf;
while ((*pszSrc != '\0') && (nSize > 1))
{
if (*pszSrc == 0x0d)
{
//
// Newline encountered before closing quote -- unterminated string.
//
*pszStore = '\0';
return TOKENSTRINGTOOLONG;
}
else if (*pszSrc != '\\')
{
*pszStore = *pszSrc;
pszSrc++;
}
else
{
//
// Backslash sequence - replace with the appropriate character.
//
pszSrc++;
if (*pszSrc == 'n')
{
*pszStore = '\n';
}
pszSrc++;
}
pszStore++;
nSize--;
}
if (*pszSrc != '\0')
{
//
// Ran out of room in the destination buffer. Skip to the close-quote,
// terminate the string, and exit.
//
ignore(1024, '\"');
*pszStore = '\0';
return TOKENSTRINGTOOLONG;
}
//
// Check for closing quote.
//
if (peek() == '\"')
{
//
// Eat the close quote and any whitespace.
//
get();
bool bCombineStrings = SkipWhiteSpace();
//
// Combine consecutive quoted strings if the combine strings character was
// encountered between the two strings.
//
if (bCombineStrings && (peek() == '\"'))
{
//
// Eat the open quote and keep parsing this string.
//
get();
}
else
{
//
// Done with this string, terminate the string and exit.
//
*pszStore = '\0';
return STRING;
}
}
}
}
//-----------------------------------------------------------------------------
// Purpose: Returns the next token, allocating enough memory to store the token
// plus a terminating NULL.
// Input : pszStore - Pointer to a string that will be allocated.
// Output : Returns the type of token that was read, or TOKENERROR.
//-----------------------------------------------------------------------------
trtoken_t TokenReader::NextTokenDynamic(char **ppszStore)
{
char szTempBuffer[8192];
trtoken_t eType = NextToken(szTempBuffer, sizeof(szTempBuffer));
int len = Q_strlen(szTempBuffer) + 1;
*ppszStore = new char [len];
Assert( *ppszStore );
Q_strncpy(*ppszStore, szTempBuffer, len );
return(eType);
}
//-----------------------------------------------------------------------------
// Purpose: Returns the next token.
// Input : pszStore - Pointer to a string that will receive the token.
// Output : Returns the type of token that was read, or TOKENERROR.
//-----------------------------------------------------------------------------
trtoken_t TokenReader::NextToken(char *pszStore, int nSize)
{
char *pStart = pszStore;
if (!is_open())
{
return TOKENEOF;
}
//
// If they stuffed a token, return that token.
//
if (m_bStuffed)
{
m_bStuffed = false;
Q_strncpy( pszStore, m_szStuffed, nSize );
return m_eStuffed;
}
SkipWhiteSpace();
if (eof())
{
return TOKENEOF;
}
if (fail())
{
return TOKENEOF;
}
char ch = get();
//
// Look for all the valid operators.
//
switch (ch)
{
case '@':
case ',':
case '!':
case '+':
case '&':
case '*':
case '$':
case '.':
case '=':
case ':':
case '[':
case ']':
case '(':
case ')':
case '{':
case '}':
case '\\':
{
pszStore[0] = ch;
pszStore[1] = 0;
return OPERATOR;
}
}
//
// Look for the start of a quoted string.
//
if (ch == '\"')
{
return GetString(pszStore, nSize);
}
//
// Integers consist of numbers with an optional leading minus sign.
//
if (isdigit(ch) || (ch == '-'))
{
do
{
if ( (pszStore - pStart + 1) < nSize )
{
*pszStore = ch;
pszStore++;
}
ch = get();
if (ch == '-')
{
return TOKENERROR;
}
} while (isdigit(ch));
//
// No identifier characters are allowed contiguous with numbers.
//
if (isalpha(ch) || (ch == '_'))
{
return TOKENERROR;
}
//
// Put back the non-numeric character for the next call.
//
putback(ch);
*pszStore = '\0';
return INTEGER;
}
//
// Identifiers consist of a consecutive string of alphanumeric
// characters and underscores.
//
while ( isalpha(ch) || isdigit(ch) || (ch == '_') )
{
if ( (pszStore - pStart + 1) < nSize )
{
*pszStore = ch;
pszStore++;
}
ch = get();
}
//
// Put back the non-identifier character for the next call.
//
putback(ch);
*pszStore = '\0';
return IDENT;
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : ttype -
// *pszToken -
//-----------------------------------------------------------------------------
void TokenReader::IgnoreTill(trtoken_t ttype, const char *pszToken)
{
trtoken_t _ttype;
char szBuf[1024];
while(1)
{
_ttype = NextToken(szBuf, sizeof(szBuf));
if(_ttype == TOKENEOF)
return;
if(_ttype == ttype)
{
if(IsToken(pszToken, szBuf))
{
Stuff(ttype, pszToken);
return;
}
}
}
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : ttype -
// pszToken -
//-----------------------------------------------------------------------------
void TokenReader::Stuff(trtoken_t eType, const char *pszToken)
{
m_eStuffed = eType;
Q_strncpy(m_szStuffed, pszToken, sizeof( m_szStuffed ) );
m_bStuffed = true;
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : ttype -
// pszToken -
// Output : Returns true on success, false on failure.
//-----------------------------------------------------------------------------
bool TokenReader::Expecting(trtoken_t ttype, const char *pszToken)
{
char szBuf[1024];
if (NextToken(szBuf, sizeof(szBuf)) != ttype || !IsToken(pszToken, szBuf))
{
return false;
}
return true;
}
//-----------------------------------------------------------------------------
// Purpose:
// Input : pszStore -
// Output :
//-----------------------------------------------------------------------------
trtoken_t TokenReader::PeekTokenType(char *pszStore, int maxlen )
{
if (!m_bStuffed)
{
m_eStuffed = NextToken(m_szStuffed, sizeof(m_szStuffed));
m_bStuffed = true;
}
if (pszStore)
{
Q_strncpy(pszStore, m_szStuffed, maxlen );
}
return(m_eStuffed);
}
//-----------------------------------------------------------------------------
// Purpose: Gets the next non-whitespace character from the file.
// Input : ch - Receives the character.
// Output : Returns true if the whitespace contained the combine strings
// character '\', which is used to merge consecutive quoted strings.
//-----------------------------------------------------------------------------
bool TokenReader::SkipWhiteSpace(void)
{
bool bCombineStrings = false;
while (true)
{
char ch = get();
if ((ch == ' ') || (ch == '\t') || (ch == '\r') || (ch == 0))
{
continue;
}
if (ch == '+')
{
bCombineStrings = true;
continue;
}
if (ch == '\n')
{
m_nLine++;
continue;
}
if (eof())
{
return(bCombineStrings);
}
//
// Check for the start of a comment.
//
if (ch == '/')
{
if (peek() == '/')
{
ignore(1024, '\n');
m_nLine++;
}
}
else
{
//
// It is a worthy character. Put it back.
//
putback(ch);
return(bCombineStrings);
}
}
}