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lexer.c
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#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include "lexerDef.h"
#include "lexer.h"
#define bufSize 128
char keywords[30][20] =
{
"integer",
"real",
"boolean",
"of",
"array",
"start",
"end",
"declare",
"module",
"driver",
"program",
"get_value",
"print",
"use",
"with",
"parameters",
"true",
"false",
"takes",
"input",
"returns",
"AND",
"OR",
"for",
"in",
"switch",
"case",
"break",
"default",
"while"
} ;
tokenID keywordToTokenID (char *str)
{
tokenID id ;
if (strcmp(str,"integer")==0)
id = TK_INTEGER ;
else if (strcmp(str, "real")==0)
id = TK_REAL ;
else if (strcmp(str, "boolean")==0)
id = TK_BOOLEAN ;
else if (strcmp(str, "of")==0)
id = TK_OF ;
else if (strcmp(str, "array")==0)
id = TK_ARRAY ;
else if (strcmp(str, "start")==0)
id = TK_START ;
else if (strcmp(str, "end")==0)
id = TK_END ;
else if (strcmp(str, "declare")==0)
id = TK_DECLARE ;
else if (strcmp(str, "module")==0)
id = TK_MODULE ;
else if (strcmp(str, "driver")==0)
id = TK_DRIVER ;
else if (strcmp(str, "program")==0)
id = TK_PROGRAM ;
else if (strcmp(str, "get_value")==0)
id = TK_GET_VALUE ;
else if (strcmp(str, "print")==0)
id = TK_PRINT ;
else if (strcmp(str, "use")==0)
id = TK_USE ;
else if (strcmp(str, "with")==0)
id = TK_WITH ;
else if (strcmp(str, "parameters")==0)
id = TK_PARAMETERS ;
else if (strcmp(str, "true")==0)
id = TK_TRUE ;
else if (strcmp(str, "false")==0)
id = TK_FALSE ;
else if (strcmp(str, "takes")==0)
id = TK_TAKES ;
else if (strcmp(str, "input")==0)
id = TK_INPUT ;
else if (strcmp(str, "returns")==0)
id = TK_RETURNS ;
else if (strcmp(str, "AND")==0)
id = TK_AND ;
else if (strcmp(str, "OR")==0)
id = TK_OR ;
else if (strcmp(str, "for")==0)
id = TK_FOR ;
else if (strcmp(str, "in")==0)
id = TK_IN ;
else if (strcmp(str, "switch")==0)
id = TK_SWITCH ;
else if (strcmp(str, "case")==0)
id = TK_CASE ;
else if (strcmp(str, "break")==0)
id = TK_BREAK ;
else if (strcmp(str, "default")==0)
id = TK_DEFAULT ;
else if (strcmp(str, "while")==0)
id = TK_WHILE ;
else
return (tokenID)-1 ;
return id ;
}
twinBuffer* lexer_init (FILE *fp)
{
int buf1_read, buf2_read ;
twinBuffer *twinBuf = (twinBuffer *) malloc (sizeof(twinBuffer)) ;
twinBuf->fp = fp ;
if (twinBuf->fp == NULL)
return NULL ;
twinBuf->buf1 = (char *) malloc (sizeof(char) * (bufSize + 1)) ;
twinBuf->buf2 = (char *) malloc (sizeof(char) * (bufSize + 1)) ;
buf1_read = fread (twinBuf->buf1, sizeof(char), bufSize, twinBuf->fp) ;
twinBuf->buf1[buf1_read] = EOF ;
twinBuf->begin = twinBuf->buf1 ;
twinBuf->forward = twinBuf->buf1 ;
twinBuf->where_begin = TWIN_ONE ;
twinBuf->where_forward = TWIN_ONE ;
buf2_read = fread (twinBuf->buf2, sizeof(char) , bufSize, twinBuf->fp) ;
twinBuf->buf2[buf2_read] = EOF ;
twinBuf->lineNumber = 1 ;
return twinBuf ;
}
void lexer_destroy (twinBuffer *twinBuf)
{
free (twinBuf->buf1) ;
free (twinBuf->buf2) ;
fclose (twinBuf->fp) ;
free (twinBuf) ;
}
int getLexemeLineNumber (twinBuffer *twinBuf)
{
int line = twinBuf->lineNumber ;
if (twinBuf->forward == twinBuf->buf1)
return line ;
if ((twinBuf->forward == twinBuf->buf2 && twinBuf->buf1[bufSize - 1] == '\n') || (*(twinBuf->forward - 1) == '\n') && *twinBuf->forward != EOF)
return line - 1 ;
}
void resetBeginPointer (twinBuffer *twinBuf)
{
if (twinBuf->where_begin == twinBuf->where_forward)
twinBuf->begin = twinBuf->forward ;
else
{
twinBuf->begin = twinBuf->forward ;
twinBuf->where_begin = TWIN_TWO ;
}
}
token *handleLexError (DFAError err, twinBuffer *twinBuf)
{
token *tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_LEXERROR ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
switch (err)
{
case UNKNOWN_SYMBOL :
tk->lexeme = (char *) malloc (sizeof(char) * (strlen("Unknown Symbol") + 1)) ;
strcpy (tk->lexeme, "Unknown Symbol") ;
break ;
case EOF_WHILE_LEXING :
retract (twinBuf) ;
resetBeginPointer (twinBuf) ;
tk->lineNumber = twinBuf->lineNumber ;
nextChar (twinBuf) ;
tk->lexeme = (char *) malloc (sizeof(char) * (strlen("Reached EOF while lexing") + 1)) ;
strcpy (tk->lexeme, "Reached EOF while lexing") ;
break ;
case EOF_COMMENT :
retract (twinBuf) ;
resetBeginPointer (twinBuf) ;
tk->lineNumber = twinBuf->lineNumber ;
nextChar (twinBuf) ;
tk->lexeme = (char *) malloc (sizeof(char) * (strlen("EOF encountered before end of comment") + 1)) ;
strcpy (tk->lexeme , "EOF encountered before end of comment") ;
break ;
case RANGEOP_ERR :
tk->lexeme = (char *) malloc (sizeof(char) * (strlen("Expected '.'")+1)) ;
strcpy (tk->lexeme, "Expected '.'") ;
break ;
case EQ_EXPECTED :
tk->lexeme = (char *) malloc (sizeof(char) * (strlen("Expected '='") + 1)) ;
strcpy (tk->lexeme, "Expected '='") ;
break ;
case TOO_LONG_ID :
tk->lexeme = (char *) malloc (sizeof(char) * (strlen("Identifier longer than 20 characters") + 1)) ;
strcpy (tk->lexeme, "Identifier longer than 20 characters") ;
break ;
case RNUM_DIG_EXPECTED :
tk->lexeme = (char *) malloc (sizeof(char) * (strlen("Digit expected in real number") + 1)) ;
strcpy (tk->lexeme, "Digit expected in real number") ;
break ;
case RNUM_DIGORSIGN_EXPECTED :
tk->lexeme = (char *) malloc (sizeof(char) * (strlen("Digit or +/- expected in real number") + 1)) ;
strcpy (tk->lexeme, "Digit or +/- expected in real number") ;
break ;
}
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
return tk ;
}
token* getNextToken(twinBuffer *twinBuf)
{
token * toret = getNextTok(twinBuf);
while(1){
if(toret->id !=TK_COMMENT)
return toret;
toret = getNextTok(twinBuf);
}
}
token* getNextTok (twinBuffer *twinBuf)
{
char ch ;
char *lexeme ;
token *tk = NULL ;
DFAStates dfa ;
DFAError err ;
DFAsim sim = NONFINAL ;
dfa = STATE_START ;
while (1)
{
switch (dfa)
{
case STATE_START :
sim = NONFINAL ;
ch = nextChar (twinBuf) ;
if (ch == EOF)
dfa = FINAL_EOF ;
else if (ch == ' ' || ch == '\n' || ch == '\t')
{
resetBeginPointer (twinBuf) ;
dfa = STATE_START ;
}
else if (isdigit(ch))
dfa = STATE_NUM_RNUM1 ;
else if (isalpha(ch))
dfa = STATE_ID1 ;
else if (ch == '+')
dfa = FINAL_PLUS ;
else if (ch == '-')
dfa = FINAL_MINUS ;
else if (ch == '/')
dfa = FINAL_DIV ;
else if (ch == ')')
dfa = FINAL_BC ;
else if (ch == '(')
dfa = FINAL_BO ;
else if (ch == ']')
dfa = FINAL_SQBC ;
else if (ch == '[')
dfa = FINAL_SQBO ;
else if (ch == ';')
dfa = FINAL_SEMICOL ;
else if (ch == '.')
dfa = STATE_RANGEOP1 ;
else if (ch == ',')
dfa = FINAL_COMMA ;
else if (ch == '!')
dfa = STATE_NE1 ;
else if (ch == '=')
dfa = STATE_EQ1 ;
else if (ch == ':')
dfa = STATE_COLON_ASSIGNOP ;
else if (ch == '<')
dfa = STATE_LT ;
else if (ch == '>')
dfa = STATE_GT ;
else if (ch == '*')
dfa = STATE_ASTERISK ;
else
{
if (ch != EOF)
retract (twinBuf) ;
err = UNKNOWN_SYMBOL ;
dfa = STATE_TRAP ;
resetBeginPointer (twinBuf) ;
}
break ;
//----------------------------------------------------------
case FINAL_PLUS :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_PLUS ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_MINUS :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_MINUS ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_DIV :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_DIV ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_BC :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_BC ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_BO :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_BO ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_SQBC :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_SQBC ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_SQBO :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_SQBO ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_SEMICOL :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_SEMICOL ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_COMMA :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_COMMA ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//======================================================================================================================
case STATE_RANGEOP1 :
sim = NONFINAL ;
ch = nextChar (twinBuf) ;
if (ch == '.')
dfa = FINAL_RANGEOP ;
else
{
if (ch != EOF)
retract (twinBuf) ;
err = RANGEOP_ERR ;
dfa = STATE_TRAP ;
resetBeginPointer (twinBuf) ;
}
break ;
//----------------------------------------------------------
case FINAL_RANGEOP :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_RANGEOP ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//======================================================================================================================
case STATE_COLON_ASSIGNOP :
sim = NONFINAL ;
ch = nextChar (twinBuf) ;
if (ch == '=')
dfa = FINAL_ASSIGNOP ;
else
{
if (ch != EOF)
retract (twinBuf) ;
dfa = FINAL_COLON ;
}
break ;
//----------------------------------------------------------
case FINAL_ASSIGNOP :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_ASSIGNOP ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_COLON :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_COLON ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//======================================================================================================================
case STATE_NE1 :
sim = NONFINAL ;
ch = nextChar (twinBuf) ;
if (ch == '=')
dfa = FINAL_NE ;
else
{
if (ch != EOF)
retract (twinBuf) ;
err = EQ_EXPECTED ;
dfa = STATE_TRAP ;
resetBeginPointer(twinBuf) ;
}
break ;
//----------------------------------------------------------
case FINAL_NE :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_NE ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//======================================================================================================================
case STATE_EQ1 :
sim = NONFINAL ;
ch = nextChar (twinBuf) ;
if (ch == '=')
dfa = FINAL_EQ ;
else
{
if (ch != EOF)
retract (twinBuf) ;
err = EQ_EXPECTED ;
dfa = STATE_TRAP ;
resetBeginPointer (twinBuf) ;
}
break ;
//----------------------------------------------------------
case FINAL_EQ :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_EQ ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//======================================================================================================================
case STATE_GT :
sim = NONFINAL ;
ch = nextChar (twinBuf) ;
if (ch == '>')
dfa = STATE_GTGT ;
else if (ch == '=')
dfa = FINAL_GE ;
else
{
if (ch != EOF)
retract (twinBuf) ;
dfa = FINAL_GT ;
}
break ;
//----------------------------------------------------------
case STATE_GTGT :
sim = NONFINAL ;
ch = nextChar (twinBuf) ;
if (ch == '>')
dfa = FINAL_DRIVERENDDEF ;
else
{
if (ch != EOF)
retract (twinBuf) ;
dfa = FINAL_ENDDEF ;
}
break ;
//----------------------------------------------------------
case FINAL_DRIVERENDDEF :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_DRIVERENDDEF ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_ENDDEF :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_ENDDEF ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_GE :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_GE ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_GT :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_GT ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//======================================================================================================================
case STATE_LT :
sim = NONFINAL ;
ch = nextChar (twinBuf) ;
if (ch == '<')
dfa = STATE_LTLT ;
else if (ch == '=')
dfa = FINAL_LE ;
else
{
if (ch != EOF)
retract (twinBuf) ;
dfa = FINAL_LT ;
}
break ;
//----------------------------------------------------------
case STATE_LTLT :
sim = NONFINAL ;
ch = nextChar (twinBuf) ;
if (ch == '<')
dfa = FINAL_DRIVERDEF ;
else
{
if (ch != EOF)
retract (twinBuf) ;
dfa = FINAL_DEF ;
}
break ;
//----------------------------------------------------------
case FINAL_DRIVERDEF :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_DRIVERDEF ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_DEF :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_DEF ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_LE :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_LE ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_LT :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_LT ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//======================================================================================================================
case STATE_ASTERISK :
sim = NONFINAL ;
ch = nextChar (twinBuf) ;
if (ch == '*')
dfa = STATE_COMMENT_START ;
else
{
if (ch != EOF)
retract (twinBuf) ;
dfa = FINAL_MUL ;
}
break ;
//----------------------------------------------------------
case STATE_COMMENT_START :
sim = NONFINAL ;
ch = nextChar (twinBuf) ;
if (ch == '*')
dfa = STATE_COMMENT_END1 ;
else if (ch == EOF)
{
err = EOF_COMMENT ;
dfa = STATE_TRAP ;
}
else
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case STATE_COMMENT_END1 :
sim = NONFINAL ;
ch = nextChar (twinBuf) ;
if (ch == '*')
dfa = FINAL_COMMENT_END2 ;
/*
else
{
if (ch != EOF)
retract (twinBuf) ;
err = COMMENT_ASTERISK ;
dfa = STATE_TRAP ;
resetBeginPointer (twinBuf) ;
}
*/
else if (ch == EOF)
{
err = EOF_COMMENT ;
dfa = STATE_TRAP ;
}
else
{
dfa = STATE_COMMENT_START ;
resetBeginPointer (twinBuf) ;
}
break ;
//----------------------------------------------------------
case FINAL_COMMENT_END2 :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_COMMENT ;
tk->lexeme = NULL ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//----------------------------------------------------------
case FINAL_MUL :
sim = FINAL ;
retract (twinBuf) ;
tk = (token *) malloc (sizeof(token)) ;
tk->id = TK_MUL ;
tk->lexeme = extract_lexeme (twinBuf) ;
tk->lineNumber = getLexemeLineNumber (twinBuf) ;
nextChar (twinBuf) ;
resetBeginPointer (twinBuf) ;
break ;
//======================================================================================================================
case STATE_ID1 :
sim = NONFINAL ;
ch = nextChar(twinBuf) ;
if (isalpha(ch) || isdigit (ch) || ch == '_')
dfa = STATE_ID2 ;
else
{
if (ch != EOF)
retract (twinBuf) ;
dfa = FINAL_ID ;
}
break ;
//----------------------------------------------------------
case STATE_ID2 :
sim = NONFINAL ;
ch = nextChar(twinBuf) ;
if (isalpha(ch) || isdigit (ch) || ch == '_')
dfa = STATE_ID3 ;
else
{
if (ch != EOF)
retract (twinBuf) ;
dfa = FINAL_ID ;
}
break ;
//----------------------------------------------------------
case STATE_ID3 :
sim = NONFINAL ;
ch = nextChar(twinBuf) ;
if (isalpha(ch) || isdigit (ch) || ch == '_')
dfa = STATE_ID4 ;
else
{
if (ch != EOF)
retract (twinBuf) ;
dfa = FINAL_ID ;
}
break ;
//----------------------------------------------------------
case STATE_ID4 :
sim = NONFINAL ;
ch = nextChar(twinBuf) ;
if (isalpha(ch) || isdigit (ch) || ch == '_')
dfa = STATE_ID5 ;
else
{
if (ch != EOF)
retract (twinBuf) ;