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tex_read.c
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tex_read.c
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/*** tex_read.c ***************************************************************
**
** This file is part of BibTool.
** It is distributed under the GNU General Public License.
** See the file COPYING for details.
**
** (c) 1996-2020 Gerd Neugebauer
**
** Net: gene@gerd-neugebauer.de
**
** 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 2, 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, write to the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**
** Purpose: Simulate the TeX reading mechanism.
**
** Compilation: cc tex_read.c -o tex_read -DSTANDALONE
**
**-----------------------------------------------------------------------------
** Description:
** This module contains functions which immitate the reading
** apparatus of \TeX{}. Macro expansion can be performed.
**
**
******************************************************************************/
#include <bibtool/general.h>
#include <ctype.h>
#ifndef STANDALONE
#include <bibtool/error.h>
#include <bibtool/symbols.h>
#else
#define Err(X) (void)fputs(X,stderr)
#define ERROR_EXIT(X) Err(X); exit(1)
#define OUT_OF_MEMORY(X) Err("Out of memory for "); Err(X); exit(1)
#endif
/*****************************************************************************/
/* External Programs */
/*===========================================================================*/
#define CARET_CARET /* enable ^^A type specification of unprintables */
#undef TRANSLATE_NEWLINE /* Translate nl to space or \par */
typedef struct tOKEN /* */
{ short int to_char; /* */
String to_s; /* */
struct tOKEN *to_next; /* */
} *Token, SToken; /* */
#define TokenChar(X) ((X)->to_char)
#define TokenSeq(X) ((X)->to_s)
#define NextToken(X) ((X)->to_next)
#define TokenNULL (Token)0
typedef struct mACdEF /* */
{ short int md_arity; /* */
String md_name; /* */
Token md_token; /* */
struct mACdEF *md_next; /* */
} *MacDef, SMacDef; /* */
#define MacroArity(X) ((X)->md_arity)
#define MacroName(X) ((X)->md_name)
#define MacroToken(X) ((X)->md_token)
#define NextMacro(X) ((X)->md_next)
#define MacDefNULL (MacDef)0
/*****************************************************************************/
/* Internal Programs */
/*===========================================================================*/
#ifdef __STDC__
#define _ARG(A) A
#else
#define _ARG(A) ()
#endif
bool TeX_read _ARG((String cp,String *sp)); /* tex_read.c */
static MacDef find_macro _ARG((String name,MacDef md));/* tex_read.c */
static MacDef new_macdef _ARG((String name,int arity,Token tokens));/* tex_read.c*/
static Token TeX_get_token _ARG((int (*get_fct)_ARG((void))));/* tex_read.c*/
static Token new_token _ARG((int type,String string));/* tex_read.c */
static Token token_list_copy _ARG((Token t,Token nt,Token *argp));/* tex_read.c*/
static Token tokenize _ARG((String s,int arity)); /* tex_read.c */
static bool fill_token _ARG((Token*tp)); /* tex_read.c */
static int do_get _ARG((void)); /* tex_read.c */
static int TeX_fill_line _ARG((int (*get_fct)_ARG((void))));/* tex_read.c */
static int get_EOF _ARG((void)); /* tex_read.c */
static int get_file _ARG((void)); /* tex_read.c */
static int get_string _ARG((void)); /* tex_read.c */
static String tokens_to_string _ARG((Token t)); /* tex_read.c */
static void free_1_token _ARG((Token t)); /* tex_read.c */
static void free_macdef _ARG((MacDef mac)); /* tex_read.c */
static void free_tokens _ARG((Token t)); /* tex_read.c */
static void init_TeX _ARG((void)); /* tex_read.c */
static void init_get _ARG((String s)); /* tex_read.c */
void TeX_active _ARG((int c,int arity,String s));/* tex_read.c */
void TeX_close _ARG((void)); /* tex_read.c */
void TeX_def _ARG((String s)); /* tex_read.c */
void TeX_define _ARG((String name,int arity,String body));/* tex_read.c */
void TeX_open_file _ARG((FILE * file)); /* tex_read.c */
void TeX_open_string _ARG((String s)); /* tex_read.c */
void TeX_reset _ARG((void)); /* tex_read.c */
#ifdef STANDALONE
int main _ARG((int argc,char *argv[])); /* tex_read.c */
static char * new_string _ARG((char * s)); /* tex-read.c */
static void show_tokens _ARG((Token t)); /* tex-read.c */
#else
extern char * new_string _ARG((char * s));
#endif
/*---------------------------------------------------------------------------*/
/*****************************************************************************/
/*** catcode Management. ***/
/*****************************************************************************/
#define CHAR_ESCAPE '\\'
#define CHAR_BEG_GROUP '{'
#define CHAR_END_GROUP '}'
#define CHAR_MATH '$'
#define CHAR_ALIGN '&'
#define CHAR_EOL '\n'
#define CHAR_PARAMETER '#'
#define CHAR_SUPERSCRIPT '^'
#define CHAR_SUBSCRIPT '_'
#define CHAR_IGNORED '\0'
#define CHAR_SPACE ' '
#define CHAR_COMMENT '%'
#define CATCODE_ESCAPE 0x0000
#define CATCODE_BEG_GROUP 0x0100
#define CATCODE_END_GROUP 0x0200
#define CATCODE_MATH 0x0300
#define CATCODE_ALIGN 0x0400
#define CATCODE_EOL 0x0500
#define CATCODE_PARAMETER 0x0600
#define CATCODE_SUPERSCRIPT 0x0700
#define CATCODE_SUBSCRIPT 0x0800
#define CATCODE_IGNORED 0x0900
#define CATCODE_SPACE 0x0A00
#define CATCODE_LETTER 0x0B00
#define CATCODE_OTHER 0x0C00
#define CATCODE_ACTIVE 0x0D00
#define CATCODE_COMMENT 0x0E00
#define CATCODE_INVALID 0x0F00
#define CATCODE_MASK 0x0F00
static short int catcode[256];
static MacDef macro = MacDefNULL;
static MacDef active[256];
#define EnsureInit init_TeX()
/*-----------------------------------------------------------------------------
** Function*: init_TeX()
** Purpose: Initialize the \TeX{} reading apparatus.
** Mainly the catcodes are assigned and the macros are
** cleared. This function has to be called before the
** other functions in this module. Thus this function is
** called automatically from different places to ensure
** that the reading apparatus is initialized.
** Arguments: none
** Returns: nothing
**___________________________________________________ */
static void init_TeX() /* */
{ register int i; /* */
static bool initialized = false; /* */
/* */
if (initialized) return; /* */
initialized = true; /* */
/* */
for (i = 0; i < 256; ++i) /* */
{ active[i] = MacDefNULL; /* */
catcode[i] = ( isalpha(i) /* */
? CATCODE_LETTER /* */
: CATCODE_OTHER ); /* */
} /* */
catcode[CHAR_ESCAPE] = CATCODE_ESCAPE; /* */
catcode[CHAR_BEG_GROUP] = CATCODE_BEG_GROUP; /* */
catcode[CHAR_END_GROUP] = CATCODE_END_GROUP; /* */
catcode[CHAR_MATH] = CATCODE_MATH; /* */
catcode[CHAR_ALIGN] = CATCODE_ALIGN; /* */
catcode[CHAR_EOL] = CATCODE_EOL; /* */
catcode[CHAR_PARAMETER] = CATCODE_PARAMETER; /* */
catcode[CHAR_SUPERSCRIPT] = CATCODE_SUPERSCRIPT; /* */
catcode[CHAR_SUBSCRIPT] = CATCODE_SUBSCRIPT; /* */
catcode[CHAR_IGNORED] = CATCODE_IGNORED; /* */
catcode[CHAR_SPACE] = CATCODE_SPACE; /* */
catcode[CHAR_COMMENT] = CATCODE_COMMENT; /* */
catcode['~'] = CATCODE_ACTIVE; /* */
} /*------------------------*/
/*****************************************************************************/
/*** Token Management. ***/
/*****************************************************************************/
static Token token_free_list = TokenNULL;
/*-----------------------------------------------------------------------------
** Function*: new_token()
** Purpose: Allocate a new token cell and fill it with values.
** Arguments:
** type the type
** string the strign value
** Returns: the new token
**___________________________________________________ */
static Token new_token(type, string) /* */
int type; /* */
String string; /* */
{ Token new; /* */
/* */
if ( token_free_list != TokenNULL ) /* */
{ new = token_free_list; /* */
token_free_list = NextToken(token_free_list); /* */
} /* */
else if ( (new=(Token)malloc(sizeof(SToken))) == TokenNULL )/* */
{ OUT_OF_MEMORY("TeX token."); } /* */
/* */
TokenChar(new) = type; /* */
TokenSeq(new) = string; /* */
NextToken(new) = TokenNULL; /* */
return new; /* */
} /*------------------------*/
#define CopyToken(t) new_token(TokenChar(t), \
TokenSeq(t) ? newString(TokenSeq(t)) : NULL)
#define NewToken(C) new_token(C, StringNULL)
/*-----------------------------------------------------------------------------
** Function*: token_list_copy()
** Purpose: Copy a list of tokens.
** Arguments:
** t
** nt
** argp
** Returns:
**___________________________________________________ */
static Token token_list_copy(t,nt,argp) /* */
register Token t; /* */
Token nt; /* */
Token *argp; /* */
{ register Token a,p; /* */
int i; /* */
/* */
if (t == TokenNULL) return TokenNULL; /* */
if ((i=TokenChar(t)) > 0xff) /* */
{ a = p = token_list_copy(argp[i>>8], /* */
TokenNULL, /* */
argp); /* */
while (NextToken(p) != TokenNULL) /* */
{ p = NextToken(p); } /* */
} /* */
else { a = p = CopyToken(t); } /* */
/* */
while ( (t=NextToken(t)) != TokenNULL ) /* */
{ /* */
if ( (i=TokenChar(t)) > 0xff ) /* */
{ NextToken(p) = token_list_copy(argp[i>>8], /* */
TokenNULL, /* */
argp); /* */
while ( NextToken(p) != TokenNULL ) /* */
{ p = NextToken(p); } /* */
} /* */
else /* */
{ NextToken(p) = CopyToken(t); /* */
p = NextToken(p); /* */
} /* */
} /* */
NextToken(p) = nt; /* */
return a; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function*: free_1_token()
** Purpose: Free a single Token.
** Free the string and place it in the free list.
** Arguments:
** t
** Returns: nothing
**___________________________________________________ */
static void free_1_token(t) /* */
register Token t; /* */
{ NextToken(t) = token_free_list; /* */
token_free_list = t; /* */
if ( TokenSeq(t) ) free(TokenSeq(t)); /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function*: free_tokens()
** Purpose: Free a list of Tokens.
** Walk along to the end and free the strings on the way.
** Link it into the free list.
** Arguments:
** t
** Returns: nothing
**___________________________________________________ */
static void free_tokens(t) /* */
register Token t; /* */
{ register Token t0; /* */
/* */
for ( t0 = t; /* */
NextToken(t0) != TokenNULL; /* */
t0 = NextToken(t0) ) /* */
{ if ( TokenSeq(t0) ) free(TokenSeq(t0)); } /* */
/* */
if ( TokenSeq(t0) ) free(TokenSeq(t0)); /* */
NextToken(t0) = token_free_list; /* */
token_free_list = t; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function*: tokens_to_string()
** Purpose: Make a string out of a list of tokens.
** Arguments:
** t
** Returns:
**___________________________________________________ */
static String tokens_to_string(t) /* */
Token t; /* */
{ register Token t1; /* */
register String s, /* */
sp; /* */
register int len; /* */
/* */
for (len = 1, t1 = t; /* Count the elements of */
t1 != TokenNULL; /* the token list. */
t1 = NextToken(t1)) /* (+1 for '\0') */
{ ++len; } /* */
/* */
if ( (s=(String)malloc(len * sizeof(Uchar))) /* */
== NULL ) /* Try to get */
{ OUT_OF_MEMORY("TeX string."); } /* new memory. */
/* */
for (sp = s, t1 = t; /* Transfer the characters*/
t1 != TokenNULL; /* from the token list */
t1 = NextToken(t1)) /* to the string. */
{ *(sp++) = TokenChar(t1); } /* */
*sp = '\0'; /* */
return s; /* Return the string. */
} /*------------------------*/
/*****************************************************************************/
/*** Reading Apparatus. ***/
/*****************************************************************************/
#define StateN 0
#define StateM 1
#define StateS 2
static int tex_state = StateN; /* */
static Token tex_line = TokenNULL; /* */
#define tex_clear tex_state = StateN; tex_line = TokenNULL
/*-----------------------------------------------------------------------------
** Function*: TeX_fill_line()
** Purpose:
**
**
** Arguments:
** get_fct
** Returns:
**___________________________________________________ */
static int TeX_fill_line(get_fct) /* */
int (*get_fct)_ARG((void)); /* function * to get char */
{ register int c; /* */
register Token t; /* */
register int spaces = 0; /* */
/* */
if ( (c=(*get_fct)()) == EOF ) return 1; /* */
tex_line = t = NewToken(c); /* */
/* */
while ( (c=(*get_fct)()) != EOF && c != '\n' ) /* */
{ if ( isspace(c) ) { ++spaces; } /* Spaces are delayed. */
else /* */
{ while ( spaces > 0 ) /* */
{ NextToken(t) = NewToken(CHAR_SPACE); /* */
t = NextToken(t); /* */
spaces--; /* */
} /* */
NextToken(t) = NewToken(c); /* */
t = NextToken(t); /* */
} /* */
} /* */
if ( TokenChar(t) == CHAR_SPACE ) TokenChar(t) = CHAR_EOL;/* */
else NextToken(t) = NewToken(CHAR_EOL); /* */
/* */
#ifdef CARET_CARET
{ register Token *tp; /* */
for ( tp= &tex_line; /* Loop over the read */
*tp!=TokenNULL; /* line. */
tp= &NextToken(*tp) ) /* */
{ t = NextToken(*tp); /* */
if ( TokenChar(*tp) == '^' /* Translate ^^. */
&& TokenChar(t=NextToken(*tp)) == '^' /* to single characters */
&& (c=TokenChar(NextToken(t))) != '\n' ) /* */
{ NextToken(*tp) = NextToken(NextToken(t)); /* */
free_1_token(NextToken(t)); /* */
free_1_token(t); /* */
TokenChar(*tp) = (c >= 64 ? c - 64 : c + 64);/* */
} /* */
} /* */
} /* */
#endif
/* */
return 0; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: TeX_get_token()
** Purpose: Get characters and pack them into a Token structure.
** The argument is a function called to get the next character.
** It returns the next character of |EOF| if no more can be read.
** Arguments:
** get_fct the function to acquire a character
** Returns: the token read
**___________________________________________________ */
static Token TeX_get_token(get_fct) /* */
int (*get_fct)_ARG((void)); /* function * to get char */
{ register Token t, t1, t2; /* */
/* */
for (;;) /* */
{ /* */
if ( tex_line == TokenNULL /* */
&& TeX_fill_line(get_fct) ) /* */
{ return TokenNULL; } /* */
/* */
t = tex_line; /* */
tex_line = NextToken(t); /* */
NextToken(t) = TokenNULL; /* */
/* */
switch ( TokenChar(t) ) /* */
{ case CHAR_IGNORED: /* */
break; /* */
#ifdef TRANSLATE_NEWLINE
case CHAR_EOL: /* */
switch (tex_state) /* */
{ case StateN: /* */
TokenChar(t) = CHAR_ESCAPE; /* */
TokenSeq(t) = newString("par"); /* */
return t; /* */
case StateM: /* */
TokenChar(t) = CHAR_SPACE; /* */
return t; /* */
} /* */
#endif
case CHAR_COMMENT: /* */
free_tokens(tex_line); /* */
tex_line = TokenNULL; /* */
break; /* */
case CHAR_SPACE: /* */
if ( tex_state == StateM ) /* */
{ tex_state = StateS; /* */
return t; /* */
} /* */
break; /* */
case CHAR_ESCAPE: /* */
t1 = tex_line; /* */
if ( isalpha(TokenChar(tex_line)) ) /* */
{ while ( isalpha(TokenChar(NextToken(tex_line))) )/* */
{ tex_line = NextToken(tex_line); } /* */
} /* */
else if ( TokenChar(tex_line) == CHAR_EOL )/* */
{ tex_state = StateM; /* */
TokenSeq(t) = newString(""); /* */
return t; /* */
} /* */
t2 = tex_line; /* */
tex_line = NextToken(tex_line); /* */
NextToken(t2) = TokenNULL; /* */
TokenSeq(t) = tokens_to_string(t1); /* */
free_tokens(t1); /* */
tex_state = StateM; /* */
return t; /* */
/* */
default: /* */
tex_state = StateM; /* */
return t; /* */
} /* */
free_1_token(t); /* */
} /* */
} /*------------------------*/
static String g_s; /* */
static String g_p; /* */
/*-----------------------------------------------------------------------------
** Function: init_get()
** Purpose:
**
**
** Arguments:
** s the string to read from
** Returns: nothing
**___________________________________________________ */
static void init_get(s) /* */
register String s; /* */
{ g_p = g_s = s; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: do_get()
** Purpose:
**
**
** Arguments: none
** Returns:
**___________________________________________________ */
static int do_get() /* */
{ return (*g_p == '\0' ? EOF : *(g_p++)); /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: tokenize()
** Purpose:
**
**
** Arguments:
** s
** arity
** Returns:
**___________________________________________________ */
static Token tokenize(s, arity) /* */
String s; /* */
int arity; /* */
{ Token t = TokenNULL, /* */
t_ret = TokenNULL, /* */
nt, t0; /* */
int a; /* */
/* */
EnsureInit; /* */
init_get(s); /* */
/* */
while ( (nt=TeX_get_token(do_get)) != TokenNULL )/* */
{ if ( TokenChar(nt) =='\n' ) /* */
{ free_1_token(nt); } /* */
else /* */
{ if ( TokenChar(nt) == CHAR_PARAMETER /* */
&& (t0=TeX_get_token(do_get)) != TokenNULL )/* */
{ a = TokenChar(t0) - '0'; /* */
if ( 0<a && a<=arity ) TokenChar(nt) |= a<<8;/* */
else { Err("*** Argument error.\n"); } /* */
free_1_token(t0); /* */
} /* */
if ( t_ret == TokenNULL ) { t_ret = t = nt; }/* */
else { NextToken(t) = nt; t = nt; } /* */
} /* */
} /* */
return t_ret; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: new_macdef()
** Purpose: Allocate a new macro definition.
**
** Arguments:
** name the name
** arity the arity
** tokens the tokens
** Returns:
**___________________________________________________ */
static MacDef new_macdef(name, arity, tokens) /* */
String name; /* */
int arity; /* */
Token tokens; /* */
{ MacDef new; /* */
/* */
if ( (new=(MacDef)malloc(sizeof(SMacDef))) == NULL )/* */
{ OUT_OF_MEMORY("TeX macro."); } /* */
/* */
MacroName(new) = name; /* */
MacroArity(new) = arity; /* */
MacroToken(new) = tokens; /* */
NextMacro(new) = MacDefNULL; /* */
return new; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: free_macdef()
** Purpose:
**
**
** Arguments:
** mac
** Returns: nothing
**___________________________________________________ */
static void free_macdef(mac) /* */
MacDef mac; /* */
{ /* */
if ( mac == MacDefNULL ) return; /* */
free(MacroToken(mac)); /* */
free(mac); /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: find_macro()
** Purpose:
**
**
** Arguments:
** name the name of the macro
** md the macro to start searching at
** Returns:
**___________________________________________________ */
static MacDef find_macro(name, md) /* */
register String name; /* */
register MacDef md; /* */
{ /* */
for ( ; md != MacDefNULL; md = NextMacro(md) ) /* */
{ if ( strcmp((char*)MacroName(md), /* */
(char*)name) == 0 ) /* */
return md; /* */
} /* */
return MacDefNULL; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: TeX_define()
** Purpose: Add a new \TeX{} macro definition.
**
**
** Arguments:
** name
** arity
** body
** Returns: nothing
**___________________________________________________ */
void TeX_define(name, arity, body) /* */
String name; /* */
int arity; /* */
String body; /* */
{ register MacDef md; /* */
/* */
if ( 0 > arity || arity > 9 ) return; /* */
/* */
md = new_macdef(name, /* */
arity, /* */
tokenize(body,arity));/* */
NextMacro(md) = macro; /* */
macro = md; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: TeX_def()
** Purpose: Define a macro.
** The argument is a string specification of the following form:
**
** |\name[arity]=replacement text|\\
** |\name=replacement text|
**
** \(0 <= arity <= 9\)
** Arguments:
** s
** Returns: nothing
**___________________________________________________ */
void TeX_def(s) /* */
String s; /* */
{ String name, /* */
ep = NULL; /* */
int arity = 0; /* */
/* */
while( isspace(*s) ) s++; /* */
name = s; /* */
while ( *s && *s != '=' ) /* */
{ if ( *s == '[' ) /* */
{ arity = *(s+1) - '0'; ep = s; } /* */
++s; /* */
} /* */
/* */
if ( ep == NULL ) ep = s; /* */
/* */
if ( *name == '\\' ) /* */
{ char c; /* */
while (ep > name + 2 && /* */
(*(ep-1) == ' ' || *(ep-1) =='\t')) /* */
{ ep--; } /* */
c = *ep; *ep = '\0'; /* */
TeX_define(newString(name + 1), /* */
arity, /* */
newString(s + 1)); /* */
*ep = c; /* */
} /* */
else /* */
{ TeX_active((unsigned int)*name, /* */
arity, /* */
newString(s+1)); /* */
} /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: TeX_active()
** Purpose: Assign a macro to an active character. If the
** character is not active then the catcode is changed.
** Arguments:
** c Character to make active.
** arity Arity of the macro assigned to the active character.
** s Body of the definition as string.
** Returns: nothing
**___________________________________________________ */
void TeX_active(c, arity, s) /* */
int c; /* */
int arity; /* */
String s; /* */
{ /* */
EnsureInit; /* */
if ( active[c] ) free_macdef(active[c]); /* */
/* */
active[c] = new_macdef(StringNULL, /* */
arity, /* */
tokenize(s,arity)); /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: TeX_reset()
** Purpose: Reset the \TeX{} reading apparatus to its initial
** state. All macros and active characters are cleared
** and the memory is released. Thus this function can
** also be used for this purpose.
** Arguments: none
** Returns: nothing
**___________________________________________________ */
void TeX_reset() /* */
{ int i; /* */
MacDef md, next; /* */
/* */
for (i = 0; i < 256; i++) /* */
{ free_macdef(active[i]); } /* */
/* */
md = macro; /* */
macro = MacDefNULL; /* */
while ( md ) /* */
{ next = NextMacro(md); /* */
free_macdef(md); /* */
md = next; /* */
} /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: get_EOF()
** Purpose: Character getter function to indicate an empty stream.
** Arguments: none
** Returns: |EOF| in any case
**___________________________________________________ */
static int get_EOF() /* */
{ return EOF; /* */
} /*------------------------*/
static FILE *src_file; /* */
static String src_string; /* */
static String src_ptr; /* */
static int (*src_get)() = get_EOF; /* */
/*-----------------------------------------------------------------------------
** Function: get_string()
** Purpose: Character getter function to access the stored string..
** Arguments: none
** Returns: the next character or |EOF| in case of end-of-string
**___________________________________________________ */
static int get_string() /* */
{ return (*src_ptr ? *(src_ptr++) : EOF); /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: get_file()
** Purpose:
**
**
** Arguments:
**
** Returns:
**___________________________________________________ */
static int get_file() /* */
{ return getc(src_file); /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: TeX_open_file()
** Purpose: Prepare things to parse from a file.
** Arguments:
** file File pointer of the file to read from.
** Returns: nothing
**___________________________________________________ */
void TeX_open_file(file) /* */
FILE * file; /* */
{ src_file = file; /* */
src_get = get_file; /* */
tex_clear; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: TeX_open_string()
** Purpose: Prepare things to parse from a string.
** Arguments:
** s String to read from.
** Returns: nothing
**___________________________________________________ */
void TeX_open_string(s) /* */
String s; /* */
{ src_ptr = src_string = s; /* */
src_get = get_string; /* */
tex_clear; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: TeX_close()
** Purpose: Gracefully terminate the reading of \TeX{} tokens. Any
** remaining pieces of text which have already been
** consumed are discarted.
** Arguments: none
** Returns: nothing
**___________________________________________________ */
void TeX_close() /* */
{ Uchar c; /* */
String s; /* */
src_get = get_EOF; /* */
while (TeX_read(&c, &s)) ; /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function: fill_token()
** Purpose: Check if *tp contains a token.
** Otherwise try to get one and store it there.
** Arguments:
** tp the pointer to the token
** Returns:
**___________________________________________________ */
static bool fill_token(tp) /* */
register Token *tp; /* */
{ /* */
if ( *tp == TokenNULL /* */
&& (*tp=TeX_get_token(src_get)) == TokenNULL)/* */
{ return false; } /* */
return true; /* */
} /*------------------------*/
#define UnlinkToken(T,T2) T2 = T; T = NextToken(T)
#define UnlinkAndFreeToken(T,T2) UnlinkToken(T,T2); free_1_token(T2)
/*-----------------------------------------------------------------------------
** Function: TeX_read()
** Purpose: Read a single Token and return it as a pair consisting
** of an ASCII code and possibly a string in case of a
** macro token.
** Arguments:
** cp Pointer to position where the character is stored.
** sp Pointer to position where the string is stored.
** Returns: |false| iff everything went right.
**___________________________________________________ */
bool TeX_read(cp, sp) /* */
String cp; /* */
String *sp; /* */
{ static Token t = TokenNULL; /* */
static Token old_t = TokenNULL; /* */
static Token arg[10]; /* */
Token t2, tp; /* */
int i, d; /* */
/* */
EnsureInit; /* */
if ( old_t != TokenNULL ) free_1_token(old_t); /* */
/* */
while ( fill_token(&t) ) /* One token left or */
{ /* I got a new one. */
MacDef mac = active[TokenChar(t)]; /* */
if ( mac != MacDefNULL ) /* Is it active? */
{ UnlinkAndFreeToken(t, t2); /* Delete active token */
} /* */
else if ( TokenChar(t) == CHAR_ESCAPE && /* */
(mac=find_macro(TokenSeq(t),macro)) /* or an undefined */
!= MacDefNULL ) /* */
{ UnlinkAndFreeToken(t,t2); /* Delete macro name token*/
while ( fill_token(&t) /* While there are more */
&& TokenChar(t) == CHAR_SPACE) /* tokens and == ' ' */
{ UnlinkAndFreeToken(t,t2); } /* unlink space */
} /* */
else /* */
{ *cp = TokenChar(t); /* */
*sp = TokenSeq(t); /* */
UnlinkToken(t,old_t); /* */
return true; /* */
} /* */
/* */
for (i = 1; i <= MacroArity(mac); ++i) /* Fill the argument */
{ /* vector */
if ( !fill_token(&t) ) /* */
{ arg[i] = TokenNULL; /* Not enough tokens */
Err("*** Unexpected EOF\n"); /* */
} /* */
else if (TokenChar(t) == CHAR_BEG_GROUP) /* If there is a group */
{ tp = t; /* */
d = 0; /* */
while ( fill_token(&NextToken(tp)) && /* While there are more */
(TokenChar(NextToken(tp)) /* tokens */
!= CHAR_END_GROUP /* and */
|| d != 0 ) ) /* no matching '}' */
{ tp = NextToken(tp); /* walk ahead and */
switch ( TokenChar(tp) ) /* count braces */
{ case CHAR_BEG_GROUP: ++d; break; /* */
case CHAR_END_GROUP: d--; break; /* */
} /* */
} /* */
t2 = NextToken(NextToken(tp)); /* */
free_1_token(NextToken(tp)); /* remove final '}' */
NextToken(tp) = TokenNULL; /* */
tp = t; t = t2; /* */
UnlinkAndFreeToken(tp,t2); /* remove initial '{' */
arg[i] = tp; /* */
} /* */
else /* */
{ arg[i] = t; /* Move one token */
t = NextToken(t); /* to argument vector */
NextToken(arg[i]) = TokenNULL; /* */
} /* */
} /* */
/* */
t = token_list_copy(MacroToken(mac),t,arg); /* */
/* */
for (i = 1; i < MacroArity(mac); ++i) /* free the arg vector */
{ if ( arg[i] != TokenNULL ) /* */
{ free_tokens(arg[i]); /* */
arg[i] = TokenNULL; /* */
} /* */
} /* */
} /* */
old_t = TokenNULL; /* */
return false; /* */
} /*------------------------*/
/*****************************************************************************/
/*** Stand alone version ***/
/*****************************************************************************/
#ifdef STANDALONE
/*-----------------------------------------------------------------------------
** Function*: new_string()
** Purpose: Allocate a space for a string and copy the argument
** there. Note this is just a new copy of the memory not
** a symbol!
**
** If no more memory is available then an error is raised
** and the program is terminated.
** Arguments:
** s String to duplicate
** Returns: Pointer to newly allocated memory containing a
** duplicate of the argument string.
**___________________________________________________ */
static char * new_string(s) /* */
register char * s; /* */
{ register char * t; /* */
if ( (t=malloc(strlen(s)+1)) == NULL ) /* */
{ OUT_OF_MEMORY("string"); } /* */
(void)strcpy(t,s); return(t); /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function*: main()
** Purpose: Main routine for the stand alone version.
** Arguments:
** argc Number of arguments (+1)
** argv Array of command line arguments (and program name)
** Returns:
**___________________________________________________ */
int main(argc,argv) /* */
int argc; /* */
char *argv[]; /* */
{ FILE *file; /* */
int kept = 0; /* */
char buffer[1024]; /* */
char c; /* */
char *s; /* */
/* */
/* */
if ( argc > 3 ) /* */
{ Err("\nTeX macro expander. gene 1/95\n\n");
Err("Usage: tex_read [macro_file [input_file]]\n\n");
Err("\tRead the macros and expand them in the input file\n");
Err("\tafterwards. Comments are also eliminated.\n\n");
Err("\tThe macros are made up of lines of the following form:\n");
Err("\t\tmacname[args]=replacement text\n");
Err("\twhere 0<=args<=9. If args=0 then [0] can be omitted.\n");
Err("\treplacement text may also contain macros which are expanded.\n\n");
Err("\tThe program mimics the reading mechanism of TeX.\n");