/* $Id$ */
/*
* Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "chars.h"
#include "out.h"
#include "term.h"
#include "man.h"
#include "mdoc.h"
#include "main.h"
/* FIXME: accomodate non-breaking, non-collapsing white-space. */
/* FIXME: accomodate non-breaking, collapsing white-space. */
static struct termp *term_alloc(enum termenc);
static void term_free(struct termp *);
static void do_special(struct termp *,
const char *, size_t);
static void do_reserved(struct termp *,
const char *, size_t);
static void buffer(struct termp *, char);
static void encode(struct termp *, char);
void *
ascii_alloc(void)
{
return(term_alloc(TERMENC_ASCII));
}
void
terminal_free(void *arg)
{
term_free((struct termp *)arg);
}
static void
term_free(struct termp *p)
{
if (p->buf)
free(p->buf);
if (p->symtab)
chars_free(p->symtab);
free(p);
}
static struct termp *
term_alloc(enum termenc enc)
{
struct termp *p;
p = calloc(1, sizeof(struct termp));
if (NULL == p) {
perror(NULL);
exit(EXIT_FAILURE);
}
p->maxrmargin = 78;
p->enc = enc;
return(p);
}
/*
* Flush a line of text. A "line" is loosely defined as being something
* that should be followed by a newline, regardless of whether it's
* broken apart by newlines getting there. A line can also be a
* fragment of a columnar list.
*
* Specifically, a line is whatever's in p->buf of length p->col, which
* is zeroed after this function returns.
*
* The usage of termp:flags is as follows:
*
* - TERMP_NOLPAD: when beginning to write the line, don't left-pad the
* offset value. This is useful when doing columnar lists where the
* prior column has right-padded.
*
* - TERMP_NOBREAK: this is the most important and is used when making
* columns. In short: don't print a newline and instead pad to the
* right margin. Used in conjunction with TERMP_NOLPAD.
*
* - TERMP_TWOSPACE: when padding, make sure there are at least two
* space characters of padding. Otherwise, rather break the line.
*
* - TERMP_DANGLE: don't newline when TERMP_NOBREAK is specified and
* the line is overrun, and don't pad-right if it's underrun.
*
* - TERMP_HANG: like TERMP_DANGLE, but doesn't newline when
* overruning, instead save the position and continue at that point
* when the next invocation.
*
* In-line line breaking:
*
* If TERMP_NOBREAK is specified and the line overruns the right
* margin, it will break and pad-right to the right margin after
* writing. If maxrmargin is violated, it will break and continue
* writing from the right-margin, which will lead to the above scenario
* upon exit. Otherwise, the line will break at the right margin.
*/
void
term_flushln(struct termp *p)
{
int i; /* current input position in p->buf */
size_t vis; /* current visual position on output */
size_t vbl; /* number of blanks to prepend to output */
size_t vsz; /* visual characters to write to output */
size_t bp; /* visual right border position */
int j; /* temporary loop index */
size_t maxvis, mmax;
static int overstep = 0;
/*
* First, establish the maximum columns of "visible" content.
* This is usually the difference between the right-margin and
* an indentation, but can be, for tagged lists or columns, a
* small set of values.
*/
assert(p->offset < p->rmargin);
maxvis = (int)(p->rmargin - p->offset) - overstep < 0 ?
/* LINTED */
0 : p->rmargin - p->offset - overstep;
mmax = (int)(p->maxrmargin - p->offset) - overstep < 0 ?
/* LINTED */
0 : p->maxrmargin - p->offset - overstep;
bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
/*
* FIXME: if bp is zero, we still output the first word before
* breaking the line.
*/
vis = 0;
/*
* If in the standard case (left-justified), then begin with our
* indentation, otherwise (columns, etc.) just start spitting
* out text.
*/
if ( ! (p->flags & TERMP_NOLPAD))
/* LINTED */
for (j = 0; j < (int)p->offset; j++)
putchar(' ');
for (i = 0; i < (int)p->col; i++) {
/*
* Count up visible word characters. Control sequences
* (starting with the CSI) aren't counted. A space
* generates a non-printing word, which is valid (the
* space is printed according to regular spacing rules).
*/
/* LINTED */
for (j = i, vsz = 0; j < (int)p->col; j++) {
if (j && ' ' == p->buf[j])
break;
else if (8 == p->buf[j])
vsz--;
else
vsz++;
}
/*
* Choose the number of blanks to prepend: no blank at the
* beginning of a line, one between words -- but do not
* actually write them yet.
*/
vbl = (size_t)(0 == vis ? 0 : 1);
/*
* Find out whether we would exceed the right margin.
* If so, break to the next line. (TODO: hyphenate)
* Otherwise, write the chosen number of blanks now.
*/
if (vis && vis + vbl + vsz > bp) {
putchar('\n');
if (TERMP_NOBREAK & p->flags) {
for (j = 0; j < (int)p->rmargin; j++)
putchar(' ');
vis = p->rmargin - p->offset;
} else {
for (j = 0; j < (int)p->offset; j++)
putchar(' ');
vis = 0;
}
/* Remove the overstep width. */
bp += (int)/* LINTED */
overstep;
overstep = 0;
} else {
for (j = 0; j < (int)vbl; j++)
putchar(' ');
vis += vbl;
}
/*
* Finally, write out the word.
*/
for ( ; i < (int)p->col; i++) {
if (' ' == p->buf[i])
break;
/* The unit sep. is a non-breaking space. */
if (31 == p->buf[i])
putchar(' ');
else
putchar(p->buf[i]);
}
vis += vsz;
}
p->col = 0;
overstep = 0;
if ( ! (TERMP_NOBREAK & p->flags)) {
putchar('\n');
return;
}
if (TERMP_HANG & p->flags) {
/* We need one blank after the tag. */
overstep = /* LINTED */
vis - maxvis + 1;
/*
* Behave exactly the same way as groff:
* If we have overstepped the margin, temporarily move
* it to the right and flag the rest of the line to be
* shorter.
* If we landed right at the margin, be happy.
* If we are one step before the margin, temporarily
* move it one step LEFT and flag the rest of the line
* to be longer.
*/
if (overstep >= -1) {
assert((int)maxvis + overstep >= 0);
/* LINTED */
maxvis += overstep;
} else
overstep = 0;
} else if (TERMP_DANGLE & p->flags)
return;
/* Right-pad. */
if (maxvis > vis + /* LINTED */
((TERMP_TWOSPACE & p->flags) ? 1 : 0))
for ( ; vis < maxvis; vis++)
putchar(' ');
else { /* ...or newline break. */
putchar('\n');
for (i = 0; i < (int)p->rmargin; i++)
putchar(' ');
}
}
/*
* A newline only breaks an existing line; it won't assert vertical
* space. All data in the output buffer is flushed prior to the newline
* assertion.
*/
void
term_newln(struct termp *p)
{
p->flags |= TERMP_NOSPACE;
if (0 == p->col) {
p->flags &= ~TERMP_NOLPAD;
return;
}
term_flushln(p);
p->flags &= ~TERMP_NOLPAD;
}
/*
* Asserts a vertical space (a full, empty line-break between lines).
* Note that if used twice, this will cause two blank spaces and so on.
* All data in the output buffer is flushed prior to the newline
* assertion.
*/
void
term_vspace(struct termp *p)
{
term_newln(p);
putchar('\n');
}
static void
do_special(struct termp *p, const char *word, size_t len)
{
const char *rhs;
size_t sz;
int i;
rhs = chars_a2ascii(p->symtab, word, len, &sz);
if (NULL == rhs) {
#if 0
fputs("Unknown special character: ", stderr);
for (i = 0; i < (int)len; i++)
fputc(word[i], stderr);
fputc('\n', stderr);
#endif
return;
}
for (i = 0; i < (int)sz; i++)
encode(p, rhs[i]);
}
static void
do_reserved(struct termp *p, const char *word, size_t len)
{
const char *rhs;
size_t sz;
int i;
rhs = chars_a2res(p->symtab, word, len, &sz);
if (NULL == rhs) {
#if 0
fputs("Unknown reserved word: ", stderr);
for (i = 0; i < (int)len; i++)
fputc(word[i], stderr);
fputc('\n', stderr);
#endif
return;
}
for (i = 0; i < (int)sz; i++)
encode(p, rhs[i]);
}
/*
* Handle pwords, partial words, which may be either a single word or a
* phrase that cannot be broken down (such as a literal string). This
* handles word styling.
*/
void
term_word(struct termp *p, const char *word)
{
const char *sv, *seq;
int sz, meta;
size_t ssz;
enum roffdeco deco;
sv = word;
if (word[0] && '\0' == word[1])
switch (word[0]) {
case('.'):
/* FALLTHROUGH */
case(','):
/* FALLTHROUGH */
case(';'):
/* FALLTHROUGH */
case(':'):
/* FALLTHROUGH */
case('?'):
/* FALLTHROUGH */
case('!'):
/* FALLTHROUGH */
case(')'):
/* FALLTHROUGH */
case(']'):
/* FALLTHROUGH */
case('}'):
if ( ! (TERMP_IGNDELIM & p->flags))
p->flags |= TERMP_NOSPACE;
break;
default:
break;
}
if ( ! (TERMP_NOSPACE & p->flags))
buffer(p, ' ');
if ( ! (p->flags & TERMP_NONOSPACE))
p->flags &= ~TERMP_NOSPACE;
/*
* FIXME: it's faster to put the metafont conditional here,
* because most of the time we're not a metafont and can use
* strcspn and fwrite.
*/
while (*word) {
if ('\\' != *word) {
encode(p, *word);
word++;
continue;
}
seq = ++word;
sz = a2roffdeco(&deco, &seq, &ssz);
switch (deco) {
case (DECO_RESERVED):
do_reserved(p, seq, ssz);
break;
case (DECO_SPECIAL):
do_special(p, seq, ssz);
break;
case (DECO_BOLD):
p->metamask = p->metafont;
p->metafont |= METAF_BOLD;
break;
case (DECO_ITALIC):
p->metamask = p->metafont;
p->metafont |= METAF_UNDER;
break;
case (DECO_ROMAN):
p->metamask = p->metafont;
p->metafont &= ~METAF_UNDER;
p->metafont &= ~METAF_BOLD;
break;
case (DECO_PREVIOUS):
meta = p->metamask;
p->metamask = p->metafont;
p->metafont = meta;
break;
default:
break;
}
word += sz;
}
if (sv[0] && 0 == sv[1])
switch (sv[0]) {
case('('):
/* FALLTHROUGH */
case('['):
/* FALLTHROUGH */
case('{'):
p->flags |= TERMP_NOSPACE;
break;
default:
break;
}
}
/*
* Insert a single character into the line-buffer. If the buffer's
* space is exceeded, then allocate more space by doubling the buffer
* size.
*/
static void
buffer(struct termp *p, char c)
{
size_t s;
if (p->col + 1 >= p->maxcols) {
if (0 == p->maxcols)
p->maxcols = 256;
s = p->maxcols * 2;
p->buf = realloc(p->buf, s);
if (NULL == p->buf) {
perror(NULL);
exit(EXIT_FAILURE);
}
p->maxcols = s;
}
p->buf[(int)(p->col)++] = c;
}
static void
encode(struct termp *p, char c)
{
if (isgraph((u_char)c)) {
if (p->under || METAF_UNDER & p->metafont) {
buffer(p, '_');
buffer(p, 8);
}
if (p->bold || METAF_BOLD & p->metafont) {
buffer(p, c);
buffer(p, 8);
}
}
buffer(p, c);
}
size_t
term_vspan(const struct roffsu *su)
{
double r;
switch (su->unit) {
case (SCALE_CM):
r = su->scale * 2;
break;
case (SCALE_IN):
r = su->scale * 6;
break;
case (SCALE_PC):
r = su->scale;
break;
case (SCALE_PT):
r = su->scale / 8;
break;
case (SCALE_MM):
r = su->scale / 1000;
break;
case (SCALE_VS):
r = su->scale;
break;
default:
r = su->scale - 1;
break;
}
if (r < 0.0)
r = 0.0;
return(/* LINTED */(size_t)
r);
}
size_t
term_hspan(const struct roffsu *su)
{
double r;
/* XXX: CM, IN, and PT are approximations. */
switch (su->unit) {
case (SCALE_CM):
r = 4 * su->scale;
break;
case (SCALE_IN):
/* XXX: this is an approximation. */
r = 10 * su->scale;
break;
case (SCALE_PC):
r = (10 * su->scale) / 6;
break;
case (SCALE_PT):
r = (10 * su->scale) / 72;
break;
case (SCALE_MM):
r = su->scale / 1000; /* FIXME: double-check. */
break;
case (SCALE_VS):
r = su->scale * 2 - 1; /* FIXME: double-check. */
break;
default:
r = su->scale;
break;
}
if (r < 0.0)
r = 0.0;
return((size_t)/* LINTED */
r);
}
