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OS/2 Shareware BBS: 5 Edit
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05-Edit.zip
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vile-src.zip
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vile-8.1
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pas-filt.c
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C/C++ Source or Header
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1998-05-19
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455 lines
/*
* Program: A simple comment and keyword attributer for vile
* Author : Jukka Keto, jketo@cs.joensuu.fi
* Date : 30.12.1994
* Modifications: kevin buettner and paul fox 2/95
* string literal ("Literal") support -- ben stoltz
*
* $Header: /usr/build/vile/vile/RCS/pas-filt.c,v 1.2 1998/05/19 19:24:11 tom Exp $
*
* Features:
* - Reads the keyword file ".vile.keywords" from the home directory.
* Keyword file consists lines "keyword:attribute" where
* keyword is any alphanumeric string [#a-zA-Z0-9_] followed
* by colon ":" and attribute character; "I" for italic,
* "U" for underline, "B" for bold, "R" for reverse or
* "C#" for color (where # is a single hexadecimal digit representing
* one of 16 colors).
* - Attributes the file read from stdin using vile attribute sequences
* and outputs the file to stdout with keywords and comments
* attributed.
* - Comments are handled by the pseudo-keyword "Comments".
* - "String literals" are handled by the pseudo-keyword "Literals".
* - Here is a macro one might use to invoke the colorizer:
* 30 store-macro
* write-message "[Attaching Pascal attributes...]"
* set-variable %savcol $curcol
* set-variable %savline $curline
* set-variable %modified $modified
* goto-beginning-of-file
* filter-til end-of-file "pas-filt"
* goto-beginning-of-file
* attribute-cntl_a-sequences-til end-of-file
* ~if ¬ %modified
* unmark-buffer
* ~endif
* %savline goto-line
* %savcol goto-column
* write-message "[Attaching Pascal attributes...done ]"
* ~endm
* bind-key execute-macro-30 ^X-q
*
* Here's the .vile.keywords file which I used to test:
Comments:C2
Literal:U
goto:C2
and:B
begin:B
case:B
case:B
constructor:B
do:B
else:B
end:B
function:B
if:B
not:B
of:B
or:B
procedure:B
program:B
record:B
repeat:B
then:B
type:B
unit:B
until:B
uses:B
while:B
with:B
array:C4
array:C4
boolean:C4
byte:C4
char:C4
const:C4
const:C4
file:C4
integer:C4
packed:C4
pointer:C4
real:C4
set:C4
var:C4
word:C4
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#else
/* assume ANSI C */
# define HAVE_STDLIB_H 1
# define HAVE_STRING_H 1
#endif
#include <sys/types.h> /* sometimes needed to get size_t */
#if HAVE_STDLIB_H
#include <stdlib.h>
#else
# if !defined(HAVE_CONFIG_H) || MISSING_EXTERN_MALLOC
extern char * malloc ( size_t len );
# endif
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdio.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#if MISSING_EXTERN__FILBUF
extern int _filbuf ( FILE *fp );
#endif
#if MISSING_EXTERN__FLSBUF
extern int _flsbuf ( int len, FILE *fp );
#endif
#if MISSING_EXTERN_FCLOSE
extern int fclose ( FILE *fp );
#endif
#if MISSING_EXTERN_FPRINTF
extern int fprintf ( FILE *fp, const char *fmt, ... );
#endif
#if MISSING_EXTERN_PRINTF
extern int printf ( const char *fmt, ... );
#endif
#if MISSING_EXTERN_SSCANF
extern int sscanf ( const char *src, const char *fmt, ... );
#endif
#if OPT_LOCALE
#include <locale.h>
#endif
#include <ctype.h>
#define MAX_KEYWORD_LENGTH 80
#define HASH_LENGTH 256
#define MAX_LINELENGTH 256
#define MAX_ATTR_LENGTH 3
#ifdef _WIN32
static char *keyword_file="vile.keywords";
#define PATHSEP '\\'
#else
# if __GO32__
#define PATHSEP '\\'
static char *keyword_file="vile.key";
# else
#define PATHSEP '/'
static char *keyword_file=".vile.keywords";
# endif
#endif
#define isNameBegin(c) (isalpha(c) || (c) == '_')
#define isNameExtra(c) (isalnum(c) || (c) == '_')
#define isBlank(c) ((c) == ' ' || (c) == '\t')
#define L_CURL '{'
#define R_CURL '}'
#define QUOTE '\''
typedef struct _keyword KEYWORD;
struct _keyword {
char kw[MAX_KEYWORD_LENGTH+1]; /* stores lowercase keyword */
char ow[MAX_KEYWORD_LENGTH+1]; /* stores original keyword */
char attribute[MAX_ATTR_LENGTH+1];
int length;
KEYWORD *next;
};
static KEYWORD *hashtable[HASH_LENGTH];
static KEYWORD identifier;
static char comment_attr[MAX_ATTR_LENGTH+1] = "C1"; /* color 1 */
static char literal_attr[MAX_ATTR_LENGTH+1] = "C2"; /* color 1 */
static void
inithash(void)
{
int i;
for (i=0;i<HASH_LENGTH;i++) hashtable[i] = NULL;
}
static void
removelist(KEYWORD *k)
{
if (k != NULL) {
if (k->next != NULL) removelist(k->next);
free((char *)k);
}
}
static void
closehash(void)
{
int i;
for (i=0;i<HASH_LENGTH;i++) {
removelist(hashtable[i]);
hashtable[i] = NULL; /* For unseen future i do this */
}
}
static int
hash_function(char *id)
{
/*
* Build more elaborate hashing scheme. If you want one.
*/
return ( (int) *id );
}
static void
insert_keyword(
char *ident,
char *attribute)
{
KEYWORD *first;
KEYWORD *nxt;
int Index;
if (!strcmp(ident,"Comments")) {
(void)strcpy(comment_attr,attribute);
return;
}
if (!strcmp(ident,"Literal")) {
strcpy(literal_attr,attribute);
return;
}
nxt = first = NULL;
Index = hash_function(ident);
first = hashtable[Index];
if ((nxt = (KEYWORD *)malloc(sizeof(struct _keyword))) != NULL) {
(void)strcpy(nxt->kw,ident);
nxt->length = strlen(nxt->kw);
(void)strcpy(nxt->attribute,attribute);
nxt->next = first;
hashtable[Index] = nxt;
#ifdef DEBUG
fprintf(stderr,"insert_keyword: new %li, new->kw %s, new->length %i, new->attribute %c, new->next %li\n", new,
nxt->kw, nxt->length, nxt->attribute,nxt->next);
#endif
}
}
static void
match_identifier(void)
{
KEYWORD *hash_id;
int Index, match = 0;
Index = hash_function(identifier.kw);
hash_id = hashtable[Index];
while (hash_id != NULL) {
if (hash_id->length == identifier.length) { /* Possible match */
if (strcmp(hash_id->kw,identifier.kw) == 0) {
match = 1;
break;
}
}
hash_id = hash_id->next;
}
if (match)
printf("\001%i%s:", identifier.length, hash_id->attribute);
printf("%s",identifier.ow);
}
static char *
extract_identifier(char *s)
{
register char *kwp = identifier.kw;
register char *owp = identifier.ow;
identifier.length = 0;
while ((isNameExtra(*s)) &&
identifier.length < MAX_KEYWORD_LENGTH) {
identifier.length += 1;
if (isalpha(*s) && isupper(*s))
*kwp++ = tolower(*s);
else
*kwp++ = *s;
*owp++ = *s++;
}
*kwp = '\0';
*owp = '\0';
return(s);
}
static FILE *
open_keywords(char *filename)
{
char *home = getenv("HOME");
char fullname[1024];
if (home == 0)
home = "";
sprintf(fullname, "%s%c%s", home, PATHSEP, filename);
return fopen(fullname, "r");
}
static void
read_keywords(char *filename)
{
char ident[MAX_KEYWORD_LENGTH+1];
char line[MAX_LINELENGTH+1];
char attribute[MAX_ATTR_LENGTH+1];
int items;
FILE *kwfile;
if ((kwfile = open_keywords(filename)) != NULL) {
fgets(line,MAX_LINELENGTH,kwfile);
items = sscanf(line,"%[#a-zA-Z0-9_]:%[IUBR]",ident,attribute);
if (items != 2)
items = sscanf(line,"%[#a-zA-Z0-9_]:%[C0-9ABCDEF]",ident,attribute);
while (! feof(kwfile) ) {
#ifdef DEBUG
fprintf(stderr,"read_keywords: Items %i, kw = %s, attr = %s\n",items,ident,attribute);
#endif
if (items == 2)
insert_keyword(ident,attribute);
fgets(line,MAX_LINELENGTH,kwfile);
items = sscanf(line,"%[#a-zA-Z0-9_]:%[IUBR]",ident,attribute);
if (items != 2)
items = sscanf(line,"%[#a-zA-Z0-9_]:%[C0-9ABCDEF]",ident,attribute);
}
fclose(kwfile);
}
}
static int
has_endofcomment(char *s)
{
int i=0;
while (*s) {
if (*s == R_CURL) {
return(i+1);
}
i += 1;
s += 1;
}
return(0);
}
static int
has_endofliteral(char *s) /* points past beginning QUOTE */
{
int i = 0;
while (s[i]) {
if (s[i] == QUOTE) {
if (s[i+1] == QUOTE) {
i += 2;
} else {
return (i); /* points before ending QUOTE */
}
}
++i;
}
return(0);
}
static char *
skip_white(char *s)
{
while(*s && isBlank(*s))
putchar(*s++);
return s;
}
static char *
write_literal(char *s)
{
int c_length = has_endofliteral(s);
if (c_length == 0)
c_length = strlen(s);
printf("\001%i%s:%.*s", c_length, literal_attr, c_length, s);
s += c_length;
if (*s == QUOTE)
putchar(*s++);
return s;
}
int
main(int argc, char **argv)
{
char line[MAX_LINELENGTH+1];
char *s;
int comment,c_length;
#if OPT_LOCALE
setlocale(LC_CTYPE, "");
#endif
comment = 0;
inithash();
if (argc > 1) {
int n;
for (n = 1; n < argc; n++)
read_keywords(argv[n]);
} else {
read_keywords(keyword_file);
}
while (fgets(line,MAX_LINELENGTH,stdin) != NULL) {
s = line;
s = skip_white(s);
while (*s) {
if (!comment && *s == L_CURL) {
c_length = has_endofcomment(s);
if (c_length == 0) { /* Comment continues to the next line */
c_length = strlen(s);
comment = 1;
}
printf("\001%i%s:%.*s",c_length,comment_attr,c_length,s);
s = s + c_length ;
}
if (comment && *s) {
if ((c_length = has_endofcomment(s)) > 0) {
printf("\001%i%s:%.*s",c_length,comment_attr,c_length,s);
s = s + c_length ;
comment = 0;
} else { /* Whole line belongs to comment */
c_length = strlen(s);
printf("\001%i%s:%.*s",c_length,comment_attr,c_length,s);
s = s + c_length;
}
} else if (*s == QUOTE) {
putchar(*s++);
s = write_literal(s);
} else if (*s) {
if ( isNameBegin(*s) ) {
s = extract_identifier(s);
match_identifier();
} else {
putchar(*s++);
}
}
}
}
closehash();
exit(0);
}