=================================================================== RCS file: /cvs/mandoc/term.c,v retrieving revision 1.255 retrieving revision 1.263 diff -u -p -r1.255 -r1.263 --- mandoc/term.c 2015/10/23 14:50:58 1.255 +++ mandoc/term.c 2017/06/04 18:50:35 1.263 @@ -1,7 +1,7 @@ -/* $Id: term.c,v 1.255 2015/10/23 14:50:58 schwarze Exp $ */ +/* $Id: term.c,v 1.263 2017/06/04 18:50:35 schwarze Exp $ */ /* * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons - * Copyright (c) 2010-2015 Ingo Schwarze + * Copyright (c) 2010-2017 Ingo Schwarze * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above @@ -84,11 +84,11 @@ term_end(struct termp *p) * to be broken, start the next line at the right margin instead * of at the offset. Used together with TERMP_NOBREAK for the tags * in various kinds of tagged lists. - * - TERMP_DANGLE: Do not break the output line at the right margin, + * - TERMP_HANG: Do not break the output line at the right margin, * append the next chunk after it even if this one is too long. * To be used together with TERMP_NOBREAK. - * - TERMP_HANG: Like TERMP_DANGLE, and also suppress padding before - * the next chunk if this column is not full. + * - TERMP_NOPAD: Start writing at the current position, + * do not pad with blank characters up to the offset. */ void term_flushln(struct termp *p) @@ -104,34 +104,15 @@ term_flushln(struct termp *p) size_t jhy; /* last hyph before overflow w/r/t j */ size_t maxvis; /* output position of visible boundary */ - /* - * 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. - * - * The following unsigned-signed subtractions look strange, - * but they are actually correct. If the int p->overstep - * is negative, it gets sign extended. Subtracting that - * very large size_t effectively adds a small number to dv. - */ - dv = p->rmargin > p->offset ? p->rmargin - p->offset : 0; - maxvis = (int)dv > p->overstep ? dv - (size_t)p->overstep : 0; - - if (p->flags & TERMP_NOBREAK) { - dv = p->maxrmargin > p->offset ? - p->maxrmargin - p->offset : 0; - bp = (int)dv > p->overstep ? - dv - (size_t)p->overstep : 0; - } else - bp = maxvis; - - /* - * Calculate the required amount of padding. - */ - vbl = p->offset + p->overstep > p->viscol ? - p->offset + p->overstep - p->viscol : 0; - + vbl = (p->flags & TERMP_NOPAD) || p->offset < p->viscol ? 0 : + p->offset - p->viscol; + if (p->minbl && vbl < p->minbl) + vbl = p->minbl; + maxvis = p->rmargin > p->viscol + vbl ? + p->rmargin - p->viscol - vbl : 0; + bp = !(p->flags & TERMP_NOBREAK) ? maxvis : + p->maxrmargin > p->viscol + vbl ? + p->maxrmargin - p->viscol - vbl : 0; vis = vend = 0; i = 0; @@ -141,8 +122,8 @@ term_flushln(struct termp *p) * subsequent tabs into a single huge set of spaces. */ ntab = 0; - while (i < p->col && '\t' == p->buf[i]) { - vend = (vis / p->tabwidth + 1) * p->tabwidth; + while (i < p->col && p->buf[i] == '\t') { + vend = term_tab_next(vis); vbl += vend - vis; vis = vend; ntab++; @@ -160,7 +141,7 @@ term_flushln(struct termp *p) if (' ' == p->buf[j] || '\t' == p->buf[j]) break; - /* Back over the the last printed character. */ + /* Back over the last printed character. */ if (8 == p->buf[j]) { assert(j); vend -= (*p->width)(p, p->buf[j - 1]); @@ -192,26 +173,22 @@ term_flushln(struct termp *p) vend -= vis; (*p->endline)(p); p->viscol = 0; - if (TERMP_BRIND & p->flags) { - vbl = p->rmargin; - vend += p->rmargin; - vend -= p->offset; - } else - vbl = p->offset; - /* use pending tabs on the new line */ + /* Use pending tabs on the new line. */ - if (0 < ntab) - vbl += ntab * p->tabwidth; + vbl = 0; + while (ntab--) + vbl = term_tab_next(vbl); - /* - * Remove the p->overstep width. - * Again, if p->overstep is negative, - * sign extension does the right thing. - */ + /* Re-establish indentation. */ - bp += (size_t)p->overstep; - p->overstep = 0; + if (p->flags & TERMP_BRIND) + vbl += p->rmargin; + else + vbl += p->offset; + maxvis = p->rmargin > vbl ? p->rmargin - vbl : 0; + bp = !(p->flags & TERMP_NOBREAK) ? maxvis : + p->maxrmargin > vbl ? p->maxrmargin - vbl : 0; } /* Write out the [remaining] word. */ @@ -266,33 +243,20 @@ term_flushln(struct termp *p) vis = 0; p->col = 0; - p->overstep = 0; - p->flags &= ~(TERMP_BACKAFTER | TERMP_BACKBEFORE); + p->flags &= ~(TERMP_BACKAFTER | TERMP_BACKBEFORE | TERMP_NOPAD); if ( ! (TERMP_NOBREAK & p->flags)) { p->viscol = 0; + p->minbl = 0; (*p->endline)(p); return; } if (TERMP_HANG & p->flags) { - p->overstep += (int)(p->offset + vis - p->rmargin + - p->trailspace * (*p->width)(p, ' ')); - - /* - * If we have overstepped the margin, temporarily move - * it to the right and flag the rest of the line to be - * shorter. - * If there is a request to keep the columns together, - * allow negative overstep when the column is not full. - */ - if (p->trailspace && p->overstep < 0) - p->overstep = 0; + p->minbl = p->trailspace; return; + } - } else if (TERMP_DANGLE & p->flags) - return; - /* Trailing whitespace is significant in some columns. */ if (vis && vbl && (TERMP_BRTRSP & p->flags)) vis += vbl; @@ -301,7 +265,9 @@ term_flushln(struct termp *p) if (maxvis < vis + p->trailspace * (*p->width)(p, ' ')) { (*p->endline)(p); p->viscol = 0; - } + p->minbl = 0; + } else + p->minbl = p->trailspace; } /* @@ -365,7 +331,7 @@ term_fontpush(struct termp *p, enum termfont f) if (++p->fonti == p->fontsz) { p->fontsz += 8; p->fontq = mandoc_reallocarray(p->fontq, - p->fontsz, sizeof(enum termfont *)); + p->fontsz, sizeof(*p->fontq)); } p->fontq[p->fonti] = f; } @@ -397,10 +363,11 @@ term_fontpop(struct termp *p) void term_word(struct termp *p, const char *word) { + struct roffsu su; const char nbrsp[2] = { ASCII_NBRSP, 0 }; const char *seq, *cp; int sz, uc; - size_t ssz; + size_t csz, lsz, ssz; enum mandoc_esc esc; if ( ! (TERMP_NOSPACE & p->flags)) { @@ -485,6 +452,83 @@ term_word(struct termp *p, const char *word) else if (*word == '\0') p->flags |= (TERMP_NOSPACE | TERMP_NONEWLINE); continue; + case ESCAPE_HORIZ: + if (a2roffsu(seq, &su, SCALE_EM) == 0) + continue; + uc = term_hspan(p, &su) / 24; + if (uc > 0) + while (uc-- > 0) + bufferc(p, ASCII_NBRSP); + else if (p->col > (size_t)(-uc)) + p->col += uc; + else { + uc += p->col; + p->col = 0; + if (p->offset > (size_t)(-uc)) { + p->ti += uc; + p->offset += uc; + } else { + p->ti -= p->offset; + p->offset = 0; + } + } + continue; + case ESCAPE_HLINE: + if (a2roffsu(seq, &su, SCALE_EM) == 0) + continue; + uc = term_hspan(p, &su) / 24; + if (uc <= 0) { + if (p->rmargin <= p->offset) + continue; + lsz = p->rmargin - p->offset; + } else + lsz = uc; + while (sz && + strchr(" %&()*+-./0123456789:<=>", *seq)) { + seq++; + sz--; + } + if (sz && strchr("cifMmnPpuv", *seq)) { + seq++; + sz--; + } + if (sz == 0) + uc = -1; + else if (*seq == '\\') { + seq++; + esc = mandoc_escape(&seq, &cp, &sz); + switch (esc) { + case ESCAPE_UNICODE: + uc = mchars_num2uc(cp + 1, sz - 1); + break; + case ESCAPE_NUMBERED: + uc = mchars_num2char(cp, sz); + break; + case ESCAPE_SPECIAL: + uc = mchars_spec2cp(cp, sz); + break; + default: + uc = -1; + break; + } + } else + uc = *seq; + if (uc < 0x20 || (uc > 0x7E && uc < 0xA0)) + uc = '_'; + if (p->enc == TERMENC_ASCII) { + cp = ascii_uc2str(uc); + csz = term_strlen(p, cp); + ssz = strlen(cp); + } else + csz = (*p->width)(p, uc); + while (lsz >= csz) { + if (p->enc == TERMENC_ASCII) + encode(p, cp, ssz); + else + encode1(p, uc); + lsz -= csz; + } + continue; case ESCAPE_SKIPCHAR: p->flags |= TERMP_BACKAFTER; continue; @@ -504,7 +548,9 @@ term_word(struct termp *p, const char *word) } } /* Trim trailing backspace/blank pair. */ - if (p->col > 2 && p->buf[p->col - 1] == ' ') + if (p->col > 2 && + (p->buf[p->col - 1] == ' ' || + p->buf[p->col - 1] == '\t')) p->col -= 2; continue; default: @@ -568,7 +614,7 @@ encode1(struct termp *p, int c) p->fontq[p->fonti] : TERMFONT_NONE; if (p->flags & TERMP_BACKBEFORE) { - if (p->buf[p->col - 1] == ' ') + if (p->buf[p->col - 1] == ' ' || p->buf[p->col - 1] == '\t') p->col--; else p->buf[p->col++] = 8; @@ -604,8 +650,20 @@ encode(struct termp *p, const char *word, size_t sz) if (ASCII_HYPH == word[i] || isgraph((unsigned char)word[i])) encode1(p, word[i]); - else + else { p->buf[p->col++] = word[i]; + + /* + * Postpone the effect of \z while handling + * an overstrike sequence from ascii_uc2str(). + */ + + if (word[i] == '\b' && + (p->flags & TERMP_BACKBEFORE)) { + p->flags &= ~TERMP_BACKBEFORE; + p->flags |= TERMP_BACKAFTER; + } + } } }