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parse.c
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C/C++ Source or Header
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1991-10-09
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6KB
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335 lines
/*
* parse.c
*
* parse dvi input
*/
#include <X11/Xos.h>
#include <X11/IntrinsicP.h>
#include <X11/StringDefs.h>
#include <stdio.h>
#include <ctype.h>
#include "DviP.h"
static int StopSeen = 0;
static ParseDrawFunction(), ParseDeviceControl();
static push_env(), pop_env();
#define HorizontalMove(dw, delta) ((dw)->dvi.state->x += (delta))
ParseInput(dw)
register DviWidget dw;
{
int n, k;
int c;
char Buffer[BUFSIZ];
int NextPage;
int otherc;
StopSeen = 0;
/*
* make sure some state exists
*/
if (!dw->dvi.state)
push_env (dw);
for (;;) {
switch (DviGetC(dw, &c)) {
case '\n':
break;
case ' ': /* when input is text */
case 0: /* occasional noise creeps in */
break;
case '{': /* push down current environment */
push_env(dw);
break;
case '}':
pop_env(dw);
break;
/*
* two motion digits plus a character
*/
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
HorizontalMove(dw, (c-'0')*10 +
DviGetC(dw,&otherc)-'0');
/* fall through */
case 'c': /* single ascii character */
DviGetC(dw,&c);
if (c == ' ')
break;
Buffer[0] = c;
Buffer[1] = '\0';
(void) PutCharacter (dw, Buffer);
break;
case 'C':
GetWord (dw, Buffer, BUFSIZ);
(void) PutCharacter (dw, Buffer);
break;
case 't':
Buffer[1] = '\0';
while (DviGetC (dw, &c) != EOF
&& c != ' ' && c != '\n') {
Buffer[0] = c;
HorizontalMove (dw, PutCharacter (dw, Buffer));
}
break;
case 'u':
n = GetNumber(dw);
Buffer[1] = '\0';
while (DviGetC (dw, &c) == ' ')
;
while (c != EOF && c != ' ' && c != '\n') {
Buffer[0] = c;
HorizontalMove (dw,
PutCharacter (dw, Buffer) + n);
DviGetC (dw, &c);
}
break;
case 'D': /* draw function */
(void) GetLine(dw, Buffer, BUFSIZ);
if (dw->dvi.display_enable)
ParseDrawFunction(dw, Buffer);
break;
case 's': /* ignore fractional sizes */
n = GetNumber(dw);
dw->dvi.state->font_size = n;
break;
case 'f':
n = GetNumber(dw);
dw->dvi.state->font_number = n;
break;
case 'H': /* absolute horizontal motion */
k = GetNumber(dw);
HorizontalGoto(dw, k);
break;
case 'h': /* relative horizontal motion */
k = GetNumber(dw);
HorizontalMove(dw, k);
break;
case 'w': /* word space */
Word (dw);
break;
case 'V':
n = GetNumber(dw);
VerticalGoto(dw, n);
break;
case 'v':
n = GetNumber(dw);
VerticalMove(dw, n);
break;
case 'P': /* new spread */
break;
case 'p': /* new page */
(void) GetNumber(dw);
NextPage = dw->dvi.current_page + 1;
RememberPagePosition(dw, NextPage);
FlushCharCache (dw);
return(NextPage);
case 'N':
n = GetNumber(dw);
PutNumberedCharacter (dw, n);
break;
case 'n': /* end of line */
GetNumber(dw);
GetNumber(dw);
Newline (dw);
HorizontalGoto(dw, 0);
break;
case '+': /* continuation of X device control */
case '#': /* comment */
GetLine(dw, NULL, 0);
break;
case 'x': /* device control */
ParseDeviceControl(dw);
break;
case EOF:
dw->dvi.last_page = dw->dvi.current_page;
FlushCharCache (dw);
return dw->dvi.current_page;
default:
break;
}
}
}
static
push_env(dw)
DviWidget dw;
{
DviState *new;
new = (DviState *) XtMalloc (sizeof (*new));
if (dw->dvi.state)
*new = *(dw->dvi.state);
else {
new->font_size = 10;
new->font_number = 1;
new->x = 0;
new->y = 0;
}
new->next = dw->dvi.state;
dw->dvi.state = new;
}
static
pop_env(dw)
DviWidget dw;
{
DviState *old;
old = dw->dvi.state;
dw->dvi.state = old->next;
XtFree ((char *) old);
}
static
InitTypesetter (dw)
DviWidget dw;
{
while (dw->dvi.state)
pop_env (dw);
push_env (dw);
FlushCharCache (dw);
}
#define DRAW_ARGS_MAX 128
static
ParseDrawFunction(dw, buf)
DviWidget dw;
char *buf;
{
int v[DRAW_ARGS_MAX];
int i;
char *ptr;
v[0] = v[1] = v[2] = v[3] = 0;
if (buf[0] == '\0')
return;
ptr = buf+1;
for (i = 0; i < DRAW_ARGS_MAX; i++) {
if (sscanf(ptr, "%d", v + i) != 1)
break;
while (*ptr == ' ')
ptr++;
while (*ptr != '\0' && *ptr != ' ')
ptr++;
}
switch (buf[0]) {
case 'l': /* draw a line */
DrawLine(dw, v[0], v[1]);
break;
case 'c': /* circle */
DrawCircle(dw, v[0]);
break;
case 'C':
DrawFilledCircle(dw, v[0]);
break;
case 'e': /* ellipse */
DrawEllipse(dw, v[0], v[1]);
break;
case 'E':
DrawFilledEllipse(dw, v[0], v[1]);
break;
case 'a': /* arc */
DrawArc(dw, v[0], v[1], v[2], v[3]);
break;
case 'p':
DrawPolygon(dw, v, i);
break;
case 'P':
DrawFilledPolygon(dw, v, i);
break;
case '~': /* wiggly line */
DrawSpline(dw, v, i);
break;
case 't':
dw->dvi.line_thickness = v[0];
break;
case 'f':
if (i > 0 && v[0] >= 0 && v[0] <= DVI_FILL_MAX)
dw->dvi.fill = v[0];
break;
default:
#if 0
warning("unknown drawing function %s", buf);
#endif
break;
}
if (buf[0] == 'e') {
if (i > 0)
dw->dvi.state->x += v[0];
}
else {
while (--i >= 0) {
if (i & 1)
dw->dvi.state->y += v[i];
else
dw->dvi.state->x += v[i];
}
}
}
static
ParseDeviceControl(dw) /* Parse the x commands */
DviWidget dw;
{
char str[20], str1[50];
int c, n;
extern int LastPage, CurrentPage;
GetWord (dw, str, 20);
switch (str[0]) { /* crude for now */
case 'T': /* output device */
GetWord (dw, str, 20);
SetDevice (dw, str);
break;
case 'i': /* initialize */
InitTypesetter (dw);
break;
case 't': /* trailer */
break;
case 'p': /* pause -- can restart */
break;
case 's': /* stop */
StopSeen = 1;
return;
case 'r': /* resolution when prepared */
break;
case 'f': /* font used */
n = GetNumber (dw);
GetWord (dw, str, 20);
GetLine (dw, str1, 50);
SetFontPosition (dw, n, str, str1);
break;
case 'H': /* char height */
break;
case 'S': /* slant */
break;
}
while (DviGetC (dw, &c) != '\n') /* skip rest of input line */
if (c == EOF)
return;
return;
}
/*
Local Variables:
c-indent-level: 8
c-continued-statement-offset: 8
c-brace-offset: -8
c-argdecl-indent: 8
c-label-offset: -8
c-tab-always-indent: nil
End:
*/