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/*
* Syntax highlighting DFA interpreter
* Copyright
* (C) 2004 Joseph H. Allen
*
* This file is part of JOE (Joe's Own Editor)
*/
#include "config.h"
#include "types.h"
__RCSID("$MirOS: contrib/code/jupp/syntax.c,v 1.26 2020/03/27 06:08:16 tg Exp $");
#include <stdlib.h>
#include <string.h>
#include "b.h"
#include "scrn.h"
#include "utils.h"
#include "hash.h"
#include "path.h"
#include "charmap.h"
#include "syntax.h"
static struct {
unsigned char buf[7];
unsigned char start;
unsigned char limit;
unsigned eaten : 1;
unsigned ebbed : 1;
unsigned unget : 1;
unsigned first : 1;
} utfstate;
static int
utfoctet(P *p)
{
int c;
utfstate.first = 0;
if (utfstate.eaten) {
ate:
if (utfstate.start < utfstate.limit)
return (utfstate.buf[utfstate.start++]);
if (utfstate.ebbed)
return (NO_MORE_DATA);
utfstate.eaten = utfstate.limit = 0;
}
if (!utfstate.limit) {
utfstate.first = 1;
if (utfstate.unget) {
c = utfstate.buf[utfstate.start];
utfstate.unget = 0;
} else
c = pgetb(p);
if ((c == NO_MORE_DATA) || (c < 0x80))
return (c);
if ((c < 0xC2) || (c >= 0xFE))
return (0xFF);
utfstate.start = 0;
utfstate.buf[utfstate.start++] = (unsigned char)c;
utfstate.limit = (c < 0xE0) ? 2 : (c < 0xF0) ? 3 :
(c < 0xF8) ? 4 : (c < 0xFC) ? 5 : 6;
}
while (utfstate.start < utfstate.limit) {
if (((c = pgetb(p)) == NO_MORE_DATA) || ((c ^ 0x80) > 0x3F)) {
/* invalid follow byte, invalidate all previous ones */
utfstate.limit = 0;
while (utfstate.limit < utfstate.start)
utfstate.buf[utfstate.limit++] = 0xFF;
/* append this as ungetch unless the well is dry */
if (c == NO_MORE_DATA)
utfstate.ebbed = 1;
else {
utfstate.buf[utfstate.limit] = (unsigned char)c;
utfstate.unget = 1;
}
/* now return those bytes */
break;
}
utfstate.buf[utfstate.start++] = (unsigned char)c;
}
utfstate.start = 0;
utfstate.eaten = 1;
goto ate;
}
static int
octetutf(P *p)
{
int c;
utfstate.first = 0;
if (!(utfstate.start < utfstate.limit)) {
if ((c = pgetb(p)) == NO_MORE_DATA)
return (NO_MORE_DATA);
utfstate.limit = utf8_encode(utfstate.buf,
joe_to_uni(p->b->o.charmap, c));
utfstate.start = 0;
utfstate.first = 1;
}
return (utfstate.buf[utfstate.start++]);
}
/* Parse one line. Returns new state.
'syntax' is the loaded syntax definition for this buffer.
'line' is advanced to start of next line.
Global array 'attr_buf' end up with coloring for each character of line.
'state' is initial parser state for the line (0 is initial state).
*/
int *attr_buf = 0;
int attr_size = 0;
int parse(struct high_syntax *syntax, P *line, int state)
{
struct high_state *h = syntax->states[state];
/* Current state */
unsigned char buf[20]; /* Name buffer (trunc after 19 characters) */
int buf_idx = 0; /* Index into buffer */
int buf_len = 0; /* counts only starting characters */
int buf_en = 0; /* Set for name buffering */
int *attr_end = attr_buf+attr_size;
int *attr = attr_buf;
int c; /* Current character */
int ofst = 0; /* record length after we've stopped buffering */
int (*getoctet)(P *) = joe_maputf(line->b->o.charmap) ?
utfoctet : octetutf;
memset(&utfstate, 0, sizeof(utfstate));
buf[0] = 0;
/* Get next character */
while((c = getoctet(line)) != NO_MORE_DATA) {
struct high_cmd *cmd, *kw_cmd;
int x;
/* Expand attribute array if necessary */
if(attr==attr_end) {
attr_buf = realloc(attr_buf,
sizeof(int) * (attr_size * 2));
attr = attr_buf + attr_size;
attr_size *= 2;
attr_end = attr_buf + attr_size;
}
/* Advance to next attribute position (note attr[-1] below) */
if (utfstate.first)
attr++;
/* Loop while noeat */
do {
/* Color with current state */
attr[-1] = h->color;
/* Get command for this character */
cmd = h->cmd[c];
/* Determine new state */
if (cmd->keywords && (cmd->ignore ?
(kw_cmd = htfind(cmd->keywords, joe_strtolower(buf))) :
(kw_cmd = htfind(cmd->keywords, buf)))) {
cmd = kw_cmd;
h = cmd->new_state;
/* Recolor keyword */
for (x = -(buf_len + 1); x < -1; ++x)
attr[x - ofst] = h->color;
} else {
h = cmd->new_state;
}
/* Recolor if necessary */
x = cmd->recolor;
while (&attr[x] < attr_buf)
++x;
while (x < 0)
attr[x++] = h->color;
/* Start buffering? */
if (cmd->start_buffering) {
buf_idx = 0;
buf_len = 0;
buf_en = 1;
ofst = 0;
}
/* Stop buffering? */
if (cmd->stop_buffering)
buf_en = 0;
} while(cmd->noeat);
/* Save character in buffer */
if (!buf_en)
ofst += utfstate.first;
else if (buf_idx < 19) {
buf[buf_idx++] = c;
buf[buf_idx] = 0;
buf_len += utfstate.first;
}
if (c == '\n')
break;
}
/* Return new state number */
return h->no;
}
/* Subroutines for load_dfa() */
static struct high_state *find_state(struct high_syntax *syntax, const unsigned char *name)
{
int x;
struct high_state *state;
/* Find state */
for(x=0;x!=syntax->nstates;++x)
if(!strcmp(syntax->states[x]->name,name))
break;
/* It doesn't exist, so create it */
if(x==syntax->nstates) {
int y;
state = malloc(sizeof(struct high_state));
state->name=(const unsigned char *)strdup((const char *)name);
state->no=syntax->nstates;
state->color=FG_WHITE;
if(!syntax->nstates)
/* We're the first state */
syntax->default_cmd.new_state = state;
if(syntax->nstates==syntax->szstates)
syntax->states = realloc(syntax->states,
sizeof(struct high_state *) * (syntax->szstates *= 2));
syntax->states[syntax->nstates++]=state;
for(y=0; y!=256; ++y)
state->cmd[y] = &syntax->default_cmd;
} else
state = syntax->states[x];
return state;
}
/* Load syntax file */
struct high_syntax *syntax_list;
struct high_syntax *load_dfa(const unsigned char *name)
{
unsigned char buf[1024];
unsigned char bf[256];
unsigned char bf1[256];
int clist[256];
unsigned char *p;
int c;
FILE *f = NULL;
struct high_state *state=0; /* Current state */
struct high_syntax *syntax; /* New syntax table */
int line = 0;
void *np;
if (!name)
return NULL;
if (!attr_buf)
attr_buf = ralloc((size_t)(attr_size = 1024), sizeof(int));
/* Find syntax table */
/* Already loaded? */
for(syntax=syntax_list;syntax;syntax=syntax->next)
if(!strcmp(syntax->name,name))
return syntax;
/* Load it */
p = (unsigned char *)getenv("HOME");
if (p) {
joe_snprintf_2((char *)buf,sizeof(buf),"%s/.jupp/syntax/%s.jsf",p,name);
f = fopen((char *)buf,"r");
}
if (!f && has_JOERC) {
joe_snprintf_2((char *)buf,sizeof(buf),"%ssyntax/%s.jsf",get_JOERC,name);
f = fopen((char *)buf,"r");
}
if(!f)
return 0;
/* Create new one */
syntax = calloc(1, sizeof(struct high_syntax));
syntax->name = (const unsigned char *)strdup((const char *)name);
syntax->next = syntax_list;
syntax_list = syntax;
syntax->states = ralloc((size_t)(syntax->szstates = 64),
sizeof(struct high_state *));
syntax->sync_lines = 120;
memset(clist, 0, sizeof(clist));
/* Parse file */
while(fgets((char *)buf,1023,f)) {
++line;
p = buf;
parse_ws(&p,'#');
if(!parse_char(&p, ':')) {
if(!parse_ident(&p, bf, 255)) {
state = find_state(syntax,bf);
parse_ws(&p,'#');
if(!parse_ident(&p,bf,255)) {
struct high_color *color;
for(color=syntax->color;color;color=color->next)
if(!strcmp(color->name,bf))
break;
if(color)
state->color=color->color;
else {
state->color=0;
fprintf(stderr,"%s:%d: Unknown class '%s'\n", name, line, bf);
}
} else
fprintf(stderr,"%s:%d: Missing color for state definition\n", name, line);
} else
fprintf(stderr,"%s:%d: Missing state name\n", name, line);
} else if(!parse_char(&p, '=')) {
if(!parse_ident(&p, bf, 255)) {
struct high_color *color;
/* Find color */
for(color=syntax->color;color;color=color->next)
if(!strcmp(color->name,bf))
break;
/* If it doesn't exist, create it */
if(!color) {
color = calloc(1, sizeof(struct high_color));
color->name = (unsigned char *)strdup((char *)bf);
color->next = syntax->color;
syntax->color = color;
} else {
fprintf(stderr,"%s:%d: Class '%s' already defined\n", name, line, bf);
}
/* Parse color definition */
while(parse_ws(&p,'#'), !parse_ident(&p,bf,255)) {
color->color |= meta_color(bf);
}
}
} else if(!parse_char(&p, '-')) { /* No. sync lines */
syntax->sync_lines = (int)ustolb(p, &np,
INT_MIN, INT_MAX, USTOL_TRIM);
if (!np)
syntax->sync_lines = -1;
else
p = np;
} else {
c = parse_ws(&p,'#');
if (!c) {
} else if (c=='"' || c=='*') {
if (state) {
if (!parse_field(&p, UC "*")) {
int z;
for(z=0;z!=256;++z)
clist[z] = 1;
} else {
c = parse_string(&p, bf, 255);
if(c)
fprintf(stderr,"%s:%d: Bad string\n", name, line);
else {
int z;
int first, second;
unsigned char *t = bf;
for(z=0;z!=256;++z)
clist[z] = 0;
while(!parse_range(&t, &first, &second)) {
if(first>second)
second = first;
while(first<=second)
clist[first++] = 1;
}
}
}
/* Create command */
parse_ws(&p,'#');
if(!parse_ident(&p,bf,255)) {
struct high_cmd *cmd = calloc(1, sizeof(struct high_cmd));
int z;
cmd->new_state = find_state(syntax,bf);
/* Parse options */
while (parse_ws(&p,'#'), !parse_ident(&p,bf,255))
if(!strcmp(bf,"buffer")) {
cmd->start_buffering = 1;
} else if(!strcmp(bf,"hold")) {
cmd->stop_buffering = 1;
} else if(!strcmp(bf,"recolor")) {
parse_ws(&p,'#');
if(!parse_char(&p,'=')) {
parse_ws(&p,'#');
cmd->recolor = (int)ustolb(p, &np,
INT_MIN, INT_MAX, USTOL_TRIM);
if (!np)
fprintf(stderr,"%s:%d: Missing value for option %s\n", name, line, bf);
else
p = np;
} else
fprintf(stderr,"%s:%d: Missing value for option %s\n", name, line, bf);
} else if(!strcmp(bf,"strings") || !strcmp(bf,"istrings")) {
if (bf[0]=='i')
cmd->ignore = 1;
while(fgets((char *)buf,1023,f)) {
++line;
p = buf;
parse_ws(&p,'#');
if (*p) {
if (!parse_field(&p, UC "done"))
break;
if(!parse_string(&p,bf,255)) {
parse_ws(&p,'#');
if (cmd->ignore)
joe_strtolower(bf);
if(!parse_ident(&p,bf1,255)) {
struct high_cmd *kw_cmd = calloc(1, sizeof(struct high_cmd));
kw_cmd->noeat=1;
kw_cmd->new_state = find_state(syntax,bf1);
if(!cmd->keywords)
cmd->keywords = htmk(64);
htadd(cmd->keywords,(unsigned char *)strdup((char *)bf),kw_cmd);
while (parse_ws(&p,'#'), !parse_ident(&p,bf,255))
if(!strcmp(bf,"buffer")) {
kw_cmd->start_buffering = 1;
} else if(!strcmp(bf,"hold")) {
kw_cmd->stop_buffering = 1;
} else if(!strcmp(bf,"recolor")) {
parse_ws(&p,'#');
if(!parse_char(&p,'=')) {
parse_ws(&p,'#');
kw_cmd->recolor = (int)ustolb(p, &np,
INT_MIN, INT_MAX, USTOL_TRIM);
if (!np)
fprintf(stderr,"%s:%d: Missing value for option %s\n", name, line, bf);
else
p = np;
} else
fprintf(stderr,"%s:%d: Missing value for option %s\n", name, line, bf);
} else
fprintf(stderr,"%s:%d: Unknown option '%s'\n", name, line, bf);
} else
fprintf(stderr,"%s:%d: Missing state name\n", name, line);
} else
fprintf(stderr,"%s:%d: Missing string\n", name, line);
}
}
} else if(!strcmp(bf,"noeat")) {
cmd->noeat = 1;
} else if(!strcmp(bf,"mark")) {
/* not implemented yet */ ;
} else if(!strcmp(bf,"markend")) {
/* not implemented yet */ ;
} else if(!strcmp(bf,"recolormark")) {
/* not implemented yet */ ;
} else
fprintf(stderr,"%s:%d: Unknown option '%s'\n", name, line, bf);
/* Install command */
for(z=0;z!=256;++z)
if(clist[z])
state->cmd[z]=cmd;
} else
fprintf(stderr,"%s:%d: Missing jump\n", name, line);
} else
fprintf(stderr,"%s:%d: No state\n", name, line);
} else
fprintf(stderr,"%s:%d: Unknown character\n", name, line);
}
}
fclose(f);
return syntax;
}
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