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bwb_int.c
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4086 lines (3542 loc) * 86.4 KB
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/***************************************************************f
bwb_int.c Line Interpretation Routines
for Bywater BASIC Interpreter
Copyright (c) 1993, Ted A. Campbell
Bywater Software
email: tcamp@delphi.com
Copyright and Permissions Information:
All U.S. and international rights are claimed by the author,
Ted A. Campbell.
This software is released under the terms of the GNU General
Public License (GPL), which is distributed with this software
in the file "COPYING". The GPL specifies the terms under
which users may copy and use the software in this distribution.
A separate license is available for commercial distribution,
for information on which you should contact the author.
***************************************************************/
/*---------------------------------------------------------------*/
/* NOTE: Modifications marked "JBV" were made by Jon B. Volkoff, */
/* 11/1995 (eidetics@cerf.net). */
/* */
/* Those additionally marked with "DD" were at the suggestion of */
/* Dale DePriest (daled@cadence.com). */
/* */
/* Version 3.00 by Howard Wulf, AF5NE */
/* */
/* Version 3.10 by Howard Wulf, AF5NE */
/* */
/* Version 3.20 by Howard Wulf, AF5NE */
/* */
/*---------------------------------------------------------------*/
#include "bwbasic.h"
static int buff_read_keyword (char *buffer, int *position, char *keyword);
static int bwb_chartype (int C);
static int char_is_varfirst (char C);
static char char_is_varhead (char C);
static int char_is_varnext (char C);
static int char_is_vartail (char C);
static int GetKeyword (LineType * l, char *Keyword);
static void internal_DEF8SUB (LineType * l);
static int is_cmd (char *name);
static int is_let (char *buffer);
static int line_read_keyword (LineType * line, char *keyword);
extern void
buff_skip_spaces (char *buffer, int *position)
{
/*
skip spaces in 'buffer'.
'position' is always updated.
*/
int p;
assert (buffer != NULL);
assert (position != NULL);
p = *position;
while (buffer[p] == ' ')
{
p++;
}
*position = p;
}
extern void
line_skip_spaces (LineType * line)
{
assert (line != NULL);
buff_skip_spaces (line->buffer, &(line->position)); /* keep this */
}
extern void
buff_skip_eol (char *buffer, int *position)
{
/*
skip to the NUL (NulChar) in 'buffer'.
always updates 'position'.
*/
int p;
assert (buffer != NULL);
assert (position != NULL);
p = *position;
while (buffer[p])
{
p++;
}
*position = p;
}
extern void
line_skip_eol (LineType * line)
{
assert (line != NULL);
buff_skip_eol (line->buffer, &(line->position));
}
extern int
buff_is_eol (char *buffer, int *position)
{
/*
determines whether 'position' is effectively at the NUL (NulChar) in 'buffer'.
if successful then 'position' is updated and returns TRUE
otherwise returns FALSE.
*/
int p;
assert (buffer != NULL);
assert (position != NULL);
p = *position;
buff_skip_spaces (buffer, &p); /* keep this */
if (buffer[p] == NulChar)
{
*position = p;
return TRUE;
}
return FALSE;
}
extern int
line_is_eol (LineType * line)
{
assert (line != NULL);
return buff_is_eol (line->buffer, &(line->position));
}
extern int
buff_peek_char (char *buffer, int *position, char find)
{
/*
determine whether the next non-space character in 'buffer' is 'find'.
if successful then returns TRUE
otherwise returns FALSE.
'position' is unchanged.
*/
assert (buffer != NULL);
assert (position != NULL);
if (find != NulChar && find != ' ')
{
int p;
p = *position;
buff_skip_spaces (buffer, &p); /* keep this */
if (buffer[p] == find)
{
return TRUE;
}
}
return FALSE;
}
#if FALSE /* keep this ... */
extern int
line_peek_char (LineType * line, char find)
{
assert (line != NULL);
return buff_peek_char (line->buffer, &(line->position), find);
}
#endif
extern int
buff_peek_EqualChar (char *buffer, int *position)
{
/*
determine whether the next non-space character in 'buffer' is 'find'.
if successful then returns TRUE
otherwise returns FALSE.
'position' is unchanged.
*/
assert (buffer != NULL);
assert (position != NULL);
return buff_peek_char (buffer, position, '=');
}
extern int
line_peek_EqualChar (LineType * line)
{
assert (line != NULL);
return buff_peek_EqualChar (line->buffer, &(line->position));
}
extern int
buff_peek_QuoteChar (char *buffer, int *position)
{
/*
determine whether the next non-space character in 'buffer' is 'find'.
if successful then returns TRUE
otherwise returns FALSE.
'position' is unchanged.
*/
assert (buffer != NULL);
assert (position != NULL);
return buff_peek_char (buffer, position,
My->CurrentVersion->OptionQuoteChar);
}
extern int
line_peek_QuoteChar (LineType * line)
{
assert (line != NULL);
return buff_peek_QuoteChar (line->buffer, &(line->position));
}
extern int
buff_peek_LparenChar (char *buffer, int *position)
{
/*
determine whether the next non-space character in 'buffer' is 'find'.
if successful then returns TRUE
otherwise returns FALSE.
'position' is unchanged.
*/
assert (buffer != NULL);
assert (position != NULL);
return buff_peek_char (buffer, position,
My->CurrentVersion->OptionLparenChar);
}
extern int
line_peek_LparenChar (LineType * line)
{
assert (line != NULL);
return buff_peek_LparenChar (line->buffer, &(line->position));
}
extern int
buff_skip_char (char *buffer, int *position, char find)
{
/*
skip the next non-space character in 'buffer' if it is 'find'.
'find' is NOT an alphabetic (A-Z,a-z) character.
if successful then 'position' is updated past 'find' and returns TRUE
otherwise 'position' is unchanged and returns FALSE.
*/
assert (buffer != NULL);
assert (position != NULL);
if (find)
{
int p;
p = *position;
buff_skip_spaces (buffer, &p); /* keep this */
if (buffer[p] == find)
{
p++;
*position = p;
return TRUE;
}
}
return FALSE;
}
extern int
line_skip_char (LineType * line, char find)
{
assert (line != NULL);
return buff_skip_char (line->buffer, &(line->position), find);
}
extern int
buff_skip_FilenumChar (char *buffer, int *position)
{
/*
skip the next non-space character in 'buffer' if it is 'find'.
if successful then 'position' is updated past 'find' and returns TRUE
otherwise 'position' is unchanged and returns FALSE.
*/
assert (buffer != NULL);
assert (position != NULL);
return buff_skip_char (buffer, position,
My->CurrentVersion->OptionFilenumChar);
}
extern int
line_skip_FilenumChar (LineType * line)
{
assert (line != NULL);
return buff_skip_FilenumChar (line->buffer, &(line->position));
}
extern int
buff_skip_AtChar (char *buffer, int *position)
{
/*
skip the next non-space character in 'buffer' if it is 'find'.
if successful then 'position' is updated past 'find' and returns TRUE
otherwise 'position' is unchanged and returns FALSE.
*/
assert (buffer != NULL);
assert (position != NULL);
return buff_skip_char (buffer, position,
My->CurrentVersion->OptionAtChar);
}
extern int
line_skip_AtChar (LineType * line)
{
assert (line != NULL);
return buff_skip_AtChar (line->buffer, &(line->position));
}
extern int
buff_skip_LparenChar (char *buffer, int *position)
{
/*
skip the next non-space character in 'buffer' if it is 'find'.
if successful then 'position' is updated past 'find' and returns TRUE
otherwise 'position' is unchanged and returns FALSE.
*/
assert (buffer != NULL);
assert (position != NULL);
return buff_skip_char (buffer, position,
My->CurrentVersion->OptionLparenChar);
}
extern int
line_skip_LparenChar (LineType * line)
{
assert (line != NULL);
return buff_skip_LparenChar (line->buffer, &(line->position));
}
extern int
buff_skip_RparenChar (char *buffer, int *position)
{
/*
skip the next non-space character in 'buffer' if it is 'find'.
if successful then 'position' is updated past 'find' and returns TRUE
otherwise 'position' is unchanged and returns FALSE.
*/
assert (buffer != NULL);
assert (position != NULL);
return buff_skip_char (buffer, position,
My->CurrentVersion->OptionRparenChar);
}
extern int
line_skip_RparenChar (LineType * line)
{
assert (line != NULL);
return buff_skip_RparenChar (line->buffer, &(line->position));
}
extern int
buff_skip_CommaChar (char *buffer, int *position)
{
/*
skip the next non-space character in 'buffer' if it is 'find'.
if successful then 'position' is updated past 'find' and returns TRUE
otherwise 'position' is unchanged and returns FALSE.
*/
assert (buffer != NULL);
assert (position != NULL);
return buff_skip_char (buffer, position, ',');
}
extern int
line_skip_CommaChar (LineType * line)
{
assert (line != NULL);
return buff_skip_CommaChar (line->buffer, &(line->position));
}
extern int
buff_skip_SemicolonChar (char *buffer, int *position)
{
/*
skip the next non-space character in 'buffer' if it is 'find'.
if successful then 'position' is updated past 'find' and returns TRUE
otherwise 'position' is unchanged and returns FALSE.
*/
assert (buffer != NULL);
assert (position != NULL);
return buff_skip_char (buffer, position, ';');
}
extern int
line_skip_SemicolonChar (LineType * line)
{
assert (line != NULL);
return buff_skip_SemicolonChar (line->buffer, &(line->position));
}
extern int
buff_skip_EqualChar (char *buffer, int *position)
{
/*
skip the next non-space character in 'buffer' if it is 'find'.
if successful then 'position' is updated past 'find' and returns TRUE
otherwise 'position' is unchanged and returns FALSE.
*/
assert (buffer != NULL);
assert (position != NULL);
return buff_skip_char (buffer, position, '=');
}
extern int
line_skip_EqualChar (LineType * line)
{
assert (line != NULL);
return buff_skip_EqualChar (line->buffer, &(line->position));
}
extern int
buff_skip_StarChar (char *buffer, int *position)
{
/*
skip the next non-space character in 'buffer' if it is 'find'.
if successful then 'position' is updated past 'find' and returns TRUE
otherwise 'position' is unchanged and returns FALSE.
*/
assert (buffer != NULL);
assert (position != NULL);
return buff_skip_char (buffer, position, '*');
}
extern int
line_skip_StarChar (LineType * line)
{
assert (line != NULL);
return buff_skip_StarChar (line->buffer, &(line->position));
}
extern int
buff_skip_PlusChar (char *buffer, int *position)
{
/*
skip the next non-space character in 'buffer' if it is 'find'.
if successful then 'position' is updated past 'find' and returns TRUE
otherwise 'position' is unchanged and returns FALSE.
*/
assert (buffer != NULL);
assert (position != NULL);
return buff_skip_char (buffer, position, '+');
}
extern int
line_skip_PlusChar (LineType * line)
{
assert (line != NULL);
return buff_skip_PlusChar (line->buffer, &(line->position));
}
extern int
buff_skip_MinusChar (char *buffer, int *position)
{
/*
skip the next non-space character in 'buffer' if it is 'find'.
if successful then 'position' is updated past 'find' and returns TRUE
otherwise 'position' is unchanged and returns FALSE.
*/
assert (buffer != NULL);
assert (position != NULL);
return buff_skip_char (buffer, position, '-');
}
extern int
line_skip_MinusChar (LineType * line)
{
assert (line != NULL);
return buff_skip_MinusChar (line->buffer, &(line->position));
}
extern char
buff_skip_seperator (char *buffer, int *position)
{
/*
skip the next non-space character in 'buffer' if it is a seperator (comma, semicolon, or colon).
if successful then 'position' is updated past the character and returns the character skipped
otherwise 'position' is unchanged and returns NulChar.
*/
int p;
char C;
assert (buffer != NULL);
assert (position != NULL);
p = *position;
buff_skip_spaces (buffer, &p); /* keep this */
C = buffer[p];
switch (C)
{
case ',': /* COMMA */
case ';': /* SEMICOLON */
case ':': /* COLON */
p++;
buff_skip_spaces (buffer, &p); /* keep this */
*position = p;
return C;
}
return NulChar;
}
extern char
line_skip_seperator (LineType * line)
{
assert (line != NULL);
return buff_skip_seperator (line->buffer, &(line->position));
}
static int
char_is_varfirst (char C)
{
/*
determine whether the character is allowed to be the first character of a BASIC variable name.
if successful then returns TRUE
otherwise returns FALSE.
*/
if (C == NulChar || C == ' ')
{
return FALSE; /* never allowed */
}
if (bwb_isalpha (C))
{
return TRUE; /* always allowed */
}
/* dialect specific */
switch (C)
{
case '@':
case '#':
case '$':
if (My->CurrentVersion->OptionVersionValue & (S70 | I70 | I73))
{
/* alphabet extenders */
return TRUE;
}
break;
}
/* NOT FOUND */
return FALSE;
}
static int
char_is_varnext (char C)
{
/*
determine whether the character is allowed to be the second character of a BASIC variable name.
if successful then returns TRUE
otherwise returns FALSE.
*/
if (C == NulChar || C == ' ')
{
return FALSE; /* never allowed */
}
if (bwb_isalnum (C))
{
return TRUE; /* always allowed */
}
/* dialect specific */
switch (C)
{
case '.':
case '_':
if (My->CurrentVersion->OptionFlags & (OPTION_BUGS_ON)) /* varname: period and underscore are allowed */
{
return TRUE;
}
break;
case '@':
case '#':
case '$':
if (My->CurrentVersion->OptionVersionValue & (S70 | I70 | I73)) /* alphabet extenders */
{
return TRUE;
}
break;
}
/* NOT FOUND */
return FALSE;
}
extern char
TypeCode_to_Char (char TypeCode)
{
/*
Convert the internal TypeCode value into the dialect-specifc tail character.
if successful then returns the dialect-specifc tail character
otherwise returns NulChar.
*/
switch (TypeCode)
{
case ByteTypeCode:
return My->CurrentVersion->OptionByteChar;
case IntegerTypeCode:
return My->CurrentVersion->OptionIntegerChar;
case LongTypeCode:
return My->CurrentVersion->OptionLongChar;
case CurrencyTypeCode:
return My->CurrentVersion->OptionCurrencyChar;
case SingleTypeCode:
return My->CurrentVersion->OptionSingleChar;
case DoubleTypeCode:
return My->CurrentVersion->OptionDoubleChar;
case StringTypeCode:
return My->CurrentVersion->OptionStringChar;
}
/* NOT FOUND */
return NulChar;
}
extern char
Char_to_TypeCode (char C)
{
/*
Convert the dialect-specifc tail character into the internal TypeCode value.
if successful then returns the internal TypeCode value
otherwise returns NulChar.
*/
if (C == NulChar || C == ' ')
{
return NulChar; /* never allowed */
}
/* dialect specific */
if (C == My->CurrentVersion->OptionByteChar)
{
return ByteTypeCode;
}
if (C == My->CurrentVersion->OptionIntegerChar)
{
return IntegerTypeCode;
}
if (C == My->CurrentVersion->OptionLongChar)
{
return LongTypeCode;
}
if (C == My->CurrentVersion->OptionCurrencyChar)
{
return CurrencyTypeCode;
}
if (C == My->CurrentVersion->OptionSingleChar)
{
return SingleTypeCode;
}
if (C == My->CurrentVersion->OptionDoubleChar)
{
return DoubleTypeCode;
}
if (C == My->CurrentVersion->OptionStringChar)
{
return StringTypeCode;
}
/* NOT FOUND */
return NulChar;
}
extern char
var_nametype (char *name)
{
/*
determine the internal TypeCode associated with the vaariable name.
if successful then returns the internal TypeCode value
otherwise returns NulChar.
*/
assert (name != NULL);
if (name == NULL)
{
WARN_INTERNAL_ERROR;
return NulChar;
}
/* look only at the last charactr of the variable name */
if (*name)
{
while (*name)
{
name++;
}
name--;
}
return Char_to_TypeCode (*name);
}
static char
char_is_varhead (char C)
{
/*
determine whether the character is allowed at the head of a variable name.
if successful then returns TRUE
otherwise retuns FALSE.
*/
if (C == NulChar || C == ' ')
{
return NulChar;
} /* never allowed */
if (char_is_varfirst (C))
{
return C;
}
if (char_is_varnext (C))
{
return C;
}
return NulChar;
}
static int
char_is_vartail (char C)
{
/*
determine whether the character is allowed at the tail of a variable name.
if successful then returns TRUE
otherwise retuns FALSE.
*/
if (C == NulChar || C == ' ')
{
return FALSE; /* never allowed */
}
if (char_is_varnext (C))
{
return TRUE;
}
if (Char_to_TypeCode (C))
{
return TRUE;
}
return FALSE;
}
#if FALSE /* kepp this ... */
extern int
buff_peek_word (char *buffer, int *position, char *find)
{
/*
determine whether the next non-space word in 'buffer' is 'find';
the word 'find' is not allowed to be a sub-string of a bigger word.
if successful then returns TRUE
otherwise returns FALSE.
'position' is unchanged.
*/
int p;
int n;
assert (buffer != NULL);
assert (position != NULL);
assert (find != NULL);
p = *position;
buff_skip_spaces (buffer, &p); /* keep this */
if (buff_is_eol (buffer, &p))
{
return FALSE;
}
n = bwb_strlen (find);
if (bwb_strnicmp (&(buffer[p]), find, n) == 0)
{
if (p > 0)
{
if (char_is_varhead (buffer[p - 1]))
{
/* _TO */
return FALSE;
}
}
if (char_is_vartail (buffer[p + n]))
{
/* TO_ */
return FALSE;
}
return TRUE;
}
return FALSE;
}
#endif
#if FALSE /* keep this ... */
extern int
line_peek_word (LineType * line, char *find)
{
assert (line != NULL);
assert (find != NULL);
return buff_peek_word (line->buffer, &(line->position), find);
}
#endif
extern int
buff_skip_word (char *buffer, int *position, char *find)
{
/*
skip the next non-space word in 'buffer' if it is 'find';
the word 'find' is not a sub-string of a bigger word.
if successful then 'position' is updated past 'find' and returns TRUE
otherwise 'position' is unchanged and returns FALSE.
*/
int p;
int n;
assert (buffer != NULL);
assert (position != NULL);
assert (find != NULL);
p = *position;
buff_skip_spaces (buffer, &p); /* keep this */
if (buff_is_eol (buffer, &p))
{
return FALSE;
}
n = bwb_strlen (find);
if (bwb_strnicmp (&(buffer[p]), find, n) == 0)
{
if (p > 0)
{
if (char_is_varhead (buffer[p - 1]))
{
/* _TO */
return FALSE;
}
}
if (char_is_vartail (buffer[p + n]))
{
/* TO_ */
return FALSE;
}
p += n;
*position = p;
return TRUE;
}
return FALSE;
}
extern int
line_skip_word (LineType * line, char *find)
{
assert (line != NULL);
assert (find != NULL);
return buff_skip_word (line->buffer, &(line->position), find);
}
extern int
buff_read_varname (char *buffer, int *position, char *varname)
{
/*
read the next non-space word in 'buffer' that conforms to a BASIC variable name into 'varname'.
if successful then 'position' is updated past 'varname' and returns TRUE
otherwise 'position' is unchanged ('varname' is truncated) and returns FALSE.
'varname' shall be declared "char varname[NameLengthMax + 1]".
*/
int p;
assert (buffer != NULL);
assert (position != NULL);
assert (varname != NULL);
p = *position;
buff_skip_spaces (buffer, &p); /* keep this */
if (char_is_varfirst (buffer[p]))
{
int i;
i = 0;
if (i > NameLengthMax)
{
i = NameLengthMax;
}
varname[i] = buffer[p];
p++;
i++;
while (char_is_varnext (buffer[p]))
{
if (i > NameLengthMax)
{
i = NameLengthMax;
}
varname[i] = buffer[p];
p++;
i++;
}
if (Char_to_TypeCode (buffer[p]))
{
if (i > NameLengthMax)
{
i = NameLengthMax;
}
varname[i] = buffer[p];
p++;
i++;
}
varname[i] = NulChar;
*position = p;
return TRUE;
}
varname[0] = NulChar;
return FALSE;
}
extern int
line_read_varname (LineType * line, char *varname)
{
assert (line != NULL);
assert (varname != NULL);
return buff_read_varname (line->buffer, &(line->position), varname);
}
extern int
buff_read_label (char *buffer, int *position, char *label)
{
/*
read the next non-space word in 'buffer' that conforms to a BASIC label name into 'label'.
if successful then 'position' is updated past 'label' and returns TRUE
otherwise 'position' is unchanged and returns FALSE.
'label' shall be declared "char label[NameLengthMax + 1]".
*/
int p;
assert (buffer != NULL);
assert (position != NULL);
assert (label != NULL);
p = *position;
buff_skip_spaces (buffer, &p); /* keep this */
if (char_is_varfirst (buffer[p]))
{
int i;
i = 0;
if (i > NameLengthMax)
{
i = NameLengthMax;
}
label[i] = buffer[p];
p++;
i++;
while (char_is_varnext (buffer[p]))
{
if (i > NameLengthMax)
{
i = NameLengthMax;
}
label[i] = buffer[p];
p++;
i++;