/* $Id$ */
/*
* 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 <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "term.h"
#include "man.h"
#include "mdoc.h"
extern int man_run(struct termp *,
const struct man *);
extern int mdoc_run(struct termp *,
const struct mdoc *);
static struct termp *term_alloc(enum termenc);
static void term_free(struct termp *);
static void term_pescape(struct termp *, const char **);
static void term_nescape(struct termp *,
const char *, size_t);
static void term_chara(struct termp *, char);
static void term_encodea(struct termp *, char);
static int term_isopendelim(const char *);
static int term_isclosedelim(const char *);
void *
ascii_alloc(void)
{
return(term_alloc(TERMENC_ASCII));
}
int
terminal_man(void *arg, const struct man *man)
{
struct termp *p;
p = (struct termp *)arg;
if (NULL == p->symtab)
p->symtab = term_ascii2htab();
return(man_run(p, man));
}
int
terminal_mdoc(void *arg, const struct mdoc *mdoc)
{
struct termp *p;
p = (struct termp *)arg;
if (NULL == p->symtab)
p->symtab = term_ascii2htab();
return(mdoc_run(p, mdoc));
}
void
terminal_free(void *arg)
{
term_free((struct termp *)arg);
}
static void
term_free(struct termp *p)
{
if (p->buf)
free(p->buf);
if (TERMENC_ASCII == p->enc && p->symtab)
term_asciifree(p->symtab);
free(p);
}
static struct termp *
term_alloc(enum termenc enc)
{
struct termp *p;
if (NULL == (p = malloc(sizeof(struct termp))))
err(1, "malloc");
bzero(p, sizeof(struct termp));
p->maxrmargin = 78;
p->enc = enc;
return(p);
}
static int
term_isclosedelim(const char *p)
{
if ( ! (*p && 0 == *(p + 1)))
return(0);
switch (*p) {
case('.'):
/* FALLTHROUGH */
case(','):
/* FALLTHROUGH */
case(';'):
/* FALLTHROUGH */
case(':'):
/* FALLTHROUGH */
case('?'):
/* FALLTHROUGH */
case('!'):
/* FALLTHROUGH */
case(')'):
/* FALLTHROUGH */
case(']'):
/* FALLTHROUGH */
case('}'):
return(1);
default:
break;
}
return(0);
}
static int
term_isopendelim(const char *p)
{
if ( ! (*p && 0 == *(p + 1)))
return(0);
switch (*p) {
case('('):
/* FALLTHROUGH */
case('['):
/* FALLTHROUGH */
case('{'):
return(1);
default:
break;
}
return(0);
}
/*
* 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. Extremely long
* lines will cause the system to emit a warning (TODO: hyphenate, if
* possible).
*
* FIXME: newline breaks occur (in groff) also occur when a single
* space follows a NOBREAK (try `Bl -tag')
*
* FIXME: there's a newline error where a `Bl -diag' will have a
* trailing newline if the line is exactly 73 chars long.
*/
void
term_flushln(struct termp *p)
{
int i, j;
size_t vbl, vsz, vis, maxvis, mmax, bp;
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);
assert((int)(p->rmargin - p->offset) - overstep > 0);
maxvis = /* LINTED */
p->rmargin - p->offset - overstep;
mmax = /* LINTED */
p->maxrmargin - p->offset - overstep;
bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
vis = 0;
overstep = 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 (' ' == 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;
}
} 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;
putchar(p->buf[i]);
}
vis += vsz;
}
p->col = 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');
}
/*
* Determine the symbol indicated by an escape sequences, that is, one
* starting with a backslash. Once done, we pass this value into the
* output buffer by way of the symbol table.
*/
static void
term_nescape(struct termp *p, const char *word, size_t len)
{
const char *rhs;
size_t sz;
int i;
rhs = term_a2ascii(p->symtab, word, len, &sz);
if (rhs)
for (i = 0; i < (int)sz; i++)
term_encodea(p, rhs[i]);
}
/*
* Handle an escape sequence: determine its length and pass it to the
* escape-symbol look table. Note that we assume mdoc(3) has validated
* the escape sequence (we assert upon badly-formed escape sequences).
*/
static void
term_pescape(struct termp *p, const char **word)
{
int j;
const char *wp;
wp = *word;
if (0 == *(++wp)) {
*word = wp;
return;
}
if ('(' == *wp) {
wp++;
if (0 == *wp || 0 == *(wp + 1)) {
*word = 0 == *wp ? wp : wp + 1;
return;
}
term_nescape(p, wp, 2);
*word = ++wp;
return;
} else if ('*' == *wp) {
if (0 == *(++wp)) {
*word = wp;
return;
}
switch (*wp) {
case ('('):
wp++;
if (0 == *wp || 0 == *(wp + 1)) {
*word = 0 == *wp ? wp : wp + 1;
return;
}
term_nescape(p, wp, 2);
*word = ++wp;
return;
case ('['):
break;
default:
term_nescape(p, wp, 1);
*word = wp;
return;
}
} else if ('f' == *wp) {
if (0 == *(++wp)) {
*word = wp;
return;
}
switch (*wp) {
case ('B'):
p->flags |= TERMP_BOLD;
break;
case ('I'):
p->flags |= TERMP_UNDER;
break;
case ('P'):
/* FALLTHROUGH */
case ('R'):
p->flags &= ~TERMP_STYLE;
break;
default:
break;
}
*word = wp;
return;
} else if ('[' != *wp) {
term_nescape(p, wp, 1);
*word = wp;
return;
}
wp++;
for (j = 0; *wp && ']' != *wp; wp++, j++)
/* Loop... */ ;
if (0 == *wp) {
*word = wp;
return;
}
term_nescape(p, wp - j, (size_t)j);
*word = wp;
}
/*
* 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;
if (term_isclosedelim(word))
if ( ! (TERMP_IGNDELIM & p->flags))
p->flags |= TERMP_NOSPACE;
if ( ! (TERMP_NOSPACE & p->flags))
term_chara(p, ' ');
if ( ! (p->flags & TERMP_NONOSPACE))
p->flags &= ~TERMP_NOSPACE;
/*
* If ANSI (word-length styling), then apply our style now,
* before the word.
*/
for (sv = word; *word; word++)
if ('\\' != *word)
term_encodea(p, *word);
else
term_pescape(p, &word);
if (term_isopendelim(sv))
p->flags |= TERMP_NOSPACE;
}
/*
* 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
term_chara(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)
err(1, "realloc");
p->maxcols = s;
}
p->buf[(int)(p->col)++] = c;
}
static void
term_encodea(struct termp *p, char c)
{
if (' ' != c && TERMP_STYLE & p->flags) {
if (TERMP_BOLD & p->flags) {
term_chara(p, c);
term_chara(p, 8);
}
if (TERMP_UNDER & p->flags) {
term_chara(p, '_');
term_chara(p, 8);
}
}
term_chara(p, c);
}
