792 lines
16 KiB
C
792 lines
16 KiB
C
/* $Id: term.c,v 1.214 2013/12/25 00:39:31 schwarze Exp $ */
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/*
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* Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
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* Copyright (c) 2010, 2011, 2012, 2013 Ingo Schwarze <schwarze@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/types.h>
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#include <assert.h>
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#include <ctype.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "mandoc.h"
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#include "out.h"
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#include "term.h"
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#include "main.h"
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static size_t cond_width(const struct termp *, int, int *);
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static void adjbuf(struct termp *p, size_t);
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static void bufferc(struct termp *, char);
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static void encode(struct termp *, const char *, size_t);
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static void encode1(struct termp *, int);
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void
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term_free(struct termp *p)
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{
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if (p->buf)
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free(p->buf);
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if (p->symtab)
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mchars_free(p->symtab);
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free(p);
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}
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void
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term_begin(struct termp *p, term_margin head,
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term_margin foot, const void *arg)
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{
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p->headf = head;
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p->footf = foot;
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p->argf = arg;
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(*p->begin)(p);
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}
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void
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term_end(struct termp *p)
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{
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(*p->end)(p);
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}
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/*
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* Flush a line of text. A "line" is loosely defined as being something
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* that should be followed by a newline, regardless of whether it's
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* broken apart by newlines getting there. A line can also be a
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* fragment of a columnar list (`Bl -tag' or `Bl -column'), which does
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* not have a trailing newline.
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*
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* The following flags may be specified:
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*
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* - TERMP_NOBREAK: this is the most important and is used when making
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* columns. In short: don't print a newline and instead expect the
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* next call to do the padding up to the start of the next column.
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* p->trailspace may be set to 0, 1, or 2, depending on how many
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* space characters are required at the end of the column.
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*
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* - TERMP_DANGLE: don't newline when TERMP_NOBREAK is specified and
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* the line is overrun, and don't pad-right if it's underrun.
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*
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* - TERMP_HANG: like TERMP_DANGLE, but doesn't newline when
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* overrunning, instead save the position and continue at that point
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* when the next invocation.
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*
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* In-line line breaking:
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*
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* If TERMP_NOBREAK is specified and the line overruns the right
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* margin, it will break and pad-right to the right margin after
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* writing. If maxrmargin is violated, it will break and continue
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* writing from the right-margin, which will lead to the above scenario
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* upon exit. Otherwise, the line will break at the right margin.
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*/
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void
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term_flushln(struct termp *p)
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{
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size_t i; /* current input position in p->buf */
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int ntab; /* number of tabs to prepend */
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size_t vis; /* current visual position on output */
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size_t vbl; /* number of blanks to prepend to output */
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size_t vend; /* end of word visual position on output */
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size_t bp; /* visual right border position */
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size_t dv; /* temporary for visual pos calculations */
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size_t j; /* temporary loop index for p->buf */
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size_t jhy; /* last hyph before overflow w/r/t j */
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size_t maxvis; /* output position of visible boundary */
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size_t mmax; /* used in calculating bp */
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/*
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* First, establish the maximum columns of "visible" content.
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* This is usually the difference between the right-margin and
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* an indentation, but can be, for tagged lists or columns, a
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* small set of values.
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*
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* The following unsigned-signed subtractions look strange,
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* but they are actually correct. If the int p->overstep
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* is negative, it gets sign extended. Subtracting that
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* very large size_t effectively adds a small number to dv.
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*/
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assert (p->rmargin >= p->offset);
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dv = p->rmargin - p->offset;
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maxvis = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0;
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dv = p->maxrmargin - p->offset;
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mmax = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0;
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bp = TERMP_NOBREAK & p->flags ? mmax : maxvis;
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/*
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* Calculate the required amount of padding.
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*/
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vbl = p->offset + p->overstep > p->viscol ?
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p->offset + p->overstep - p->viscol : 0;
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vis = vend = 0;
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i = 0;
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while (i < p->col) {
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/*
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* Handle literal tab characters: collapse all
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* subsequent tabs into a single huge set of spaces.
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*/
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ntab = 0;
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while (i < p->col && '\t' == p->buf[i]) {
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vend = (vis / p->tabwidth + 1) * p->tabwidth;
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vbl += vend - vis;
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vis = vend;
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ntab++;
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i++;
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}
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/*
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* Count up visible word characters. Control sequences
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* (starting with the CSI) aren't counted. A space
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* generates a non-printing word, which is valid (the
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* space is printed according to regular spacing rules).
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*/
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for (j = i, jhy = 0; j < p->col; j++) {
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if (' ' == p->buf[j] || '\t' == p->buf[j])
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break;
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/* Back over the the last printed character. */
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if (8 == p->buf[j]) {
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assert(j);
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vend -= (*p->width)(p, p->buf[j - 1]);
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continue;
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}
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/* Regular word. */
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/* Break at the hyphen point if we overrun. */
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if (vend > vis && vend < bp &&
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ASCII_HYPH == p->buf[j])
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jhy = j;
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vend += (*p->width)(p, p->buf[j]);
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}
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/*
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* Find out whether we would exceed the right margin.
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* If so, break to the next line.
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*/
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if (vend > bp && 0 == jhy && vis > 0) {
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vend -= vis;
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(*p->endline)(p);
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p->viscol = 0;
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if (TERMP_NOBREAK & p->flags) {
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vbl = p->rmargin;
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vend += p->rmargin - p->offset;
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} else
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vbl = p->offset;
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/* use pending tabs on the new line */
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if (0 < ntab)
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vbl += ntab * p->tabwidth;
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/*
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* Remove the p->overstep width.
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* Again, if p->overstep is negative,
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* sign extension does the right thing.
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*/
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bp += (size_t)p->overstep;
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p->overstep = 0;
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}
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/* Write out the [remaining] word. */
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for ( ; i < p->col; i++) {
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if (vend > bp && jhy > 0 && i > jhy)
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break;
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if ('\t' == p->buf[i])
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break;
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if (' ' == p->buf[i]) {
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j = i;
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while (' ' == p->buf[i])
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i++;
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dv = (i - j) * (*p->width)(p, ' ');
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vbl += dv;
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vend += dv;
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break;
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}
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if (ASCII_NBRSP == p->buf[i]) {
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vbl += (*p->width)(p, ' ');
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continue;
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}
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/*
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* Now we definitely know there will be
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* printable characters to output,
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* so write preceding white space now.
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*/
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if (vbl) {
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(*p->advance)(p, vbl);
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p->viscol += vbl;
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vbl = 0;
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}
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if (ASCII_HYPH == p->buf[i]) {
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(*p->letter)(p, '-');
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p->viscol += (*p->width)(p, '-');
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continue;
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}
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(*p->letter)(p, p->buf[i]);
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if (8 == p->buf[i])
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p->viscol -= (*p->width)(p, p->buf[i-1]);
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else
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p->viscol += (*p->width)(p, p->buf[i]);
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}
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vis = vend;
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}
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/*
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* If there was trailing white space, it was not printed;
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* so reset the cursor position accordingly.
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*/
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if (vis)
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vis -= vbl;
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p->col = 0;
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p->overstep = 0;
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if ( ! (TERMP_NOBREAK & p->flags)) {
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p->viscol = 0;
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(*p->endline)(p);
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return;
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}
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if (TERMP_HANG & p->flags) {
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p->overstep = (int)(vis - maxvis +
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p->trailspace * (*p->width)(p, ' '));
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/*
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* If we have overstepped the margin, temporarily move
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* it to the right and flag the rest of the line to be
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* shorter.
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* If there is a request to keep the columns together,
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* allow negative overstep when the column is not full.
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*/
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if (p->trailspace && p->overstep < 0)
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p->overstep = 0;
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return;
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} else if (TERMP_DANGLE & p->flags)
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return;
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/* If the column was overrun, break the line. */
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if (maxvis < vis + p->trailspace * (*p->width)(p, ' ')) {
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(*p->endline)(p);
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p->viscol = 0;
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}
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}
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/*
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* A newline only breaks an existing line; it won't assert vertical
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* space. All data in the output buffer is flushed prior to the newline
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* assertion.
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*/
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void
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term_newln(struct termp *p)
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{
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p->flags |= TERMP_NOSPACE;
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if (p->col || p->viscol)
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term_flushln(p);
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}
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/*
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* Asserts a vertical space (a full, empty line-break between lines).
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* Note that if used twice, this will cause two blank spaces and so on.
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* All data in the output buffer is flushed prior to the newline
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* assertion.
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*/
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void
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term_vspace(struct termp *p)
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{
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term_newln(p);
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p->viscol = 0;
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if (0 < p->skipvsp)
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p->skipvsp--;
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else
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(*p->endline)(p);
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}
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void
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term_fontlast(struct termp *p)
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{
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enum termfont f;
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f = p->fontl;
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p->fontl = p->fontq[p->fonti];
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p->fontq[p->fonti] = f;
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}
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void
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term_fontrepl(struct termp *p, enum termfont f)
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{
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p->fontl = p->fontq[p->fonti];
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p->fontq[p->fonti] = f;
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}
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void
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term_fontpush(struct termp *p, enum termfont f)
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{
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assert(p->fonti + 1 < 10);
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p->fontl = p->fontq[p->fonti];
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p->fontq[++p->fonti] = f;
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}
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const void *
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term_fontq(struct termp *p)
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{
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return(&p->fontq[p->fonti]);
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}
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enum termfont
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term_fonttop(struct termp *p)
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{
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return(p->fontq[p->fonti]);
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}
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void
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term_fontpopq(struct termp *p, const void *key)
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{
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while (p->fonti >= 0 && key < (void *)(p->fontq + p->fonti))
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p->fonti--;
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assert(p->fonti >= 0);
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}
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void
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term_fontpop(struct termp *p)
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{
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assert(p->fonti);
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p->fonti--;
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}
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/*
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* Handle pwords, partial words, which may be either a single word or a
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* phrase that cannot be broken down (such as a literal string). This
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* handles word styling.
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*/
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void
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term_word(struct termp *p, const char *word)
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{
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const char nbrsp[2] = { ASCII_NBRSP, 0 };
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const char *seq, *cp;
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char c;
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int sz, uc;
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size_t ssz;
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enum mandoc_esc esc;
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if ( ! (TERMP_NOSPACE & p->flags)) {
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if ( ! (TERMP_KEEP & p->flags)) {
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bufferc(p, ' ');
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if (TERMP_SENTENCE & p->flags)
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bufferc(p, ' ');
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} else
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bufferc(p, ASCII_NBRSP);
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}
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if (TERMP_PREKEEP & p->flags)
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p->flags |= TERMP_KEEP;
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if ( ! (p->flags & TERMP_NONOSPACE))
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p->flags &= ~TERMP_NOSPACE;
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else
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p->flags |= TERMP_NOSPACE;
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p->flags &= ~TERMP_SENTENCE;
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while ('\0' != *word) {
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if ('\\' != *word) {
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if (TERMP_SKIPCHAR & p->flags) {
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p->flags &= ~TERMP_SKIPCHAR;
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word++;
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continue;
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}
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if (TERMP_NBRWORD & p->flags) {
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if (' ' == *word) {
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encode(p, nbrsp, 1);
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word++;
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continue;
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}
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ssz = strcspn(word, "\\ ");
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} else
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ssz = strcspn(word, "\\");
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encode(p, word, ssz);
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word += (int)ssz;
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continue;
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}
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word++;
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esc = mandoc_escape(&word, &seq, &sz);
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if (ESCAPE_ERROR == esc)
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break;
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if (TERMENC_ASCII != p->enc)
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switch (esc) {
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case (ESCAPE_UNICODE):
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uc = mchars_num2uc(seq + 1, sz - 1);
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if ('\0' == uc)
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break;
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encode1(p, uc);
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continue;
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case (ESCAPE_SPECIAL):
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uc = mchars_spec2cp(p->symtab, seq, sz);
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if (uc <= 0)
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break;
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encode1(p, uc);
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continue;
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default:
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break;
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}
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switch (esc) {
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case (ESCAPE_UNICODE):
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encode1(p, '?');
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break;
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case (ESCAPE_NUMBERED):
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c = mchars_num2char(seq, sz);
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if ('\0' != c)
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encode(p, &c, 1);
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break;
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case (ESCAPE_SPECIAL):
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cp = mchars_spec2str(p->symtab, seq, sz, &ssz);
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if (NULL != cp)
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encode(p, cp, ssz);
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else if (1 == ssz)
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encode(p, seq, sz);
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break;
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case (ESCAPE_FONTBOLD):
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term_fontrepl(p, TERMFONT_BOLD);
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break;
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case (ESCAPE_FONTITALIC):
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term_fontrepl(p, TERMFONT_UNDER);
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break;
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case (ESCAPE_FONTBI):
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term_fontrepl(p, TERMFONT_BI);
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break;
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case (ESCAPE_FONT):
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/* FALLTHROUGH */
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case (ESCAPE_FONTROMAN):
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term_fontrepl(p, TERMFONT_NONE);
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break;
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case (ESCAPE_FONTPREV):
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term_fontlast(p);
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break;
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case (ESCAPE_NOSPACE):
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if (TERMP_SKIPCHAR & p->flags)
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p->flags &= ~TERMP_SKIPCHAR;
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else if ('\0' == *word)
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p->flags |= TERMP_NOSPACE;
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break;
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case (ESCAPE_SKIPCHAR):
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p->flags |= TERMP_SKIPCHAR;
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break;
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default:
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break;
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}
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}
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p->flags &= ~TERMP_NBRWORD;
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}
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static void
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adjbuf(struct termp *p, size_t sz)
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{
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if (0 == p->maxcols)
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p->maxcols = 1024;
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while (sz >= p->maxcols)
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p->maxcols <<= 2;
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p->buf = mandoc_realloc(p->buf, sizeof(int) * p->maxcols);
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}
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static void
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bufferc(struct termp *p, char c)
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{
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if (p->col + 1 >= p->maxcols)
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adjbuf(p, p->col + 1);
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p->buf[p->col++] = c;
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}
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/*
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* See encode().
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* Do this for a single (probably unicode) value.
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* Does not check for non-decorated glyphs.
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*/
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static void
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|
encode1(struct termp *p, int c)
|
|
{
|
|
enum termfont f;
|
|
|
|
if (TERMP_SKIPCHAR & p->flags) {
|
|
p->flags &= ~TERMP_SKIPCHAR;
|
|
return;
|
|
}
|
|
|
|
if (p->col + 6 >= p->maxcols)
|
|
adjbuf(p, p->col + 6);
|
|
|
|
f = term_fonttop(p);
|
|
|
|
if (TERMFONT_UNDER == f || TERMFONT_BI == f) {
|
|
p->buf[p->col++] = '_';
|
|
p->buf[p->col++] = 8;
|
|
}
|
|
if (TERMFONT_BOLD == f || TERMFONT_BI == f) {
|
|
if (ASCII_HYPH == c)
|
|
p->buf[p->col++] = '-';
|
|
else
|
|
p->buf[p->col++] = c;
|
|
p->buf[p->col++] = 8;
|
|
}
|
|
p->buf[p->col++] = c;
|
|
}
|
|
|
|
static void
|
|
encode(struct termp *p, const char *word, size_t sz)
|
|
{
|
|
size_t i;
|
|
|
|
if (TERMP_SKIPCHAR & p->flags) {
|
|
p->flags &= ~TERMP_SKIPCHAR;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Encode and buffer a string of characters. If the current
|
|
* font mode is unset, buffer directly, else encode then buffer
|
|
* character by character.
|
|
*/
|
|
|
|
if (TERMFONT_NONE == term_fonttop(p)) {
|
|
if (p->col + sz >= p->maxcols)
|
|
adjbuf(p, p->col + sz);
|
|
for (i = 0; i < sz; i++)
|
|
p->buf[p->col++] = word[i];
|
|
return;
|
|
}
|
|
|
|
/* Pre-buffer, assuming worst-case. */
|
|
|
|
if (p->col + 1 + (sz * 5) >= p->maxcols)
|
|
adjbuf(p, p->col + 1 + (sz * 5));
|
|
|
|
for (i = 0; i < sz; i++) {
|
|
if (ASCII_HYPH == word[i] ||
|
|
isgraph((unsigned char)word[i]))
|
|
encode1(p, word[i]);
|
|
else
|
|
p->buf[p->col++] = word[i];
|
|
}
|
|
}
|
|
|
|
size_t
|
|
term_len(const struct termp *p, size_t sz)
|
|
{
|
|
|
|
return((*p->width)(p, ' ') * sz);
|
|
}
|
|
|
|
static size_t
|
|
cond_width(const struct termp *p, int c, int *skip)
|
|
{
|
|
|
|
if (*skip) {
|
|
(*skip) = 0;
|
|
return(0);
|
|
} else
|
|
return((*p->width)(p, c));
|
|
}
|
|
|
|
size_t
|
|
term_strlen(const struct termp *p, const char *cp)
|
|
{
|
|
size_t sz, rsz, i;
|
|
int ssz, skip, c;
|
|
const char *seq, *rhs;
|
|
enum mandoc_esc esc;
|
|
static const char rej[] = { '\\', ASCII_HYPH, ASCII_NBRSP, '\0' };
|
|
|
|
/*
|
|
* Account for escaped sequences within string length
|
|
* calculations. This follows the logic in term_word() as we
|
|
* must calculate the width of produced strings.
|
|
*/
|
|
|
|
sz = 0;
|
|
skip = 0;
|
|
while ('\0' != *cp) {
|
|
rsz = strcspn(cp, rej);
|
|
for (i = 0; i < rsz; i++)
|
|
sz += cond_width(p, *cp++, &skip);
|
|
|
|
c = 0;
|
|
switch (*cp) {
|
|
case ('\\'):
|
|
cp++;
|
|
esc = mandoc_escape(&cp, &seq, &ssz);
|
|
if (ESCAPE_ERROR == esc)
|
|
return(sz);
|
|
|
|
if (TERMENC_ASCII != p->enc)
|
|
switch (esc) {
|
|
case (ESCAPE_UNICODE):
|
|
c = mchars_num2uc
|
|
(seq + 1, ssz - 1);
|
|
if ('\0' == c)
|
|
break;
|
|
sz += cond_width(p, c, &skip);
|
|
continue;
|
|
case (ESCAPE_SPECIAL):
|
|
c = mchars_spec2cp
|
|
(p->symtab, seq, ssz);
|
|
if (c <= 0)
|
|
break;
|
|
sz += cond_width(p, c, &skip);
|
|
continue;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
rhs = NULL;
|
|
|
|
switch (esc) {
|
|
case (ESCAPE_UNICODE):
|
|
sz += cond_width(p, '?', &skip);
|
|
break;
|
|
case (ESCAPE_NUMBERED):
|
|
c = mchars_num2char(seq, ssz);
|
|
if ('\0' != c)
|
|
sz += cond_width(p, c, &skip);
|
|
break;
|
|
case (ESCAPE_SPECIAL):
|
|
rhs = mchars_spec2str
|
|
(p->symtab, seq, ssz, &rsz);
|
|
|
|
if (ssz != 1 || rhs)
|
|
break;
|
|
|
|
rhs = seq;
|
|
rsz = ssz;
|
|
break;
|
|
case (ESCAPE_SKIPCHAR):
|
|
skip = 1;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (NULL == rhs)
|
|
break;
|
|
|
|
if (skip) {
|
|
skip = 0;
|
|
break;
|
|
}
|
|
|
|
for (i = 0; i < rsz; i++)
|
|
sz += (*p->width)(p, *rhs++);
|
|
break;
|
|
case (ASCII_NBRSP):
|
|
sz += cond_width(p, ' ', &skip);
|
|
cp++;
|
|
break;
|
|
case (ASCII_HYPH):
|
|
sz += cond_width(p, '-', &skip);
|
|
cp++;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
return(sz);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
size_t
|
|
term_vspan(const struct termp *p, 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 termp *p, const struct roffsu *su)
|
|
{
|
|
double v;
|
|
|
|
v = ((*p->hspan)(p, su));
|
|
if (v < 0.0)
|
|
v = 0.0;
|
|
return((size_t) /* LINTED */
|
|
v);
|
|
}
|