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freebsd-nq/contrib/mandoc/html.c
Baptiste Daroussin 45a5aec3f1 Update mandoc to cvs snapshot 2019-07-23 
This snapshot among other things includes a fix for a crash of mandoc with empty
tbl reported by rea@ (his regression test has been incorporated upstream)

MFC after:	3 weeks
2019-07-26 10:00:33 +00:00

966 lines
19 KiB
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/* $Id: html.c,v 1.255 2019/04/30 15:53:00 schwarze Exp $ */
/*
* Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
* Copyright (c) 2011-2015, 2017-2019 Ingo Schwarze <schwarze@openbsd.org>
*
* 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 AUTHORS DISCLAIM ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS 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 "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <assert.h>
#include <ctype.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "mandoc_aux.h"
#include "mandoc_ohash.h"
#include "mandoc.h"
#include "roff.h"
#include "out.h"
#include "html.h"
#include "manconf.h"
#include "main.h"
struct htmldata {
const char *name;
int flags;
#define HTML_NOSTACK (1 << 0)
#define HTML_AUTOCLOSE (1 << 1)
#define HTML_NLBEFORE (1 << 2)
#define HTML_NLBEGIN (1 << 3)
#define HTML_NLEND (1 << 4)
#define HTML_NLAFTER (1 << 5)
#define HTML_NLAROUND (HTML_NLBEFORE | HTML_NLAFTER)
#define HTML_NLINSIDE (HTML_NLBEGIN | HTML_NLEND)
#define HTML_NLALL (HTML_NLAROUND | HTML_NLINSIDE)
#define HTML_INDENT (1 << 6)
#define HTML_NOINDENT (1 << 7)
};
static const struct htmldata htmltags[TAG_MAX] = {
{"html", HTML_NLALL},
{"head", HTML_NLALL | HTML_INDENT},
{"body", HTML_NLALL},
{"meta", HTML_NOSTACK | HTML_AUTOCLOSE | HTML_NLALL},
{"title", HTML_NLAROUND},
{"div", HTML_NLAROUND},
{"div", 0},
{"section", HTML_NLALL},
{"h1", HTML_NLAROUND},
{"h2", HTML_NLAROUND},
{"span", 0},
{"link", HTML_NOSTACK | HTML_AUTOCLOSE | HTML_NLALL},
{"br", HTML_NOSTACK | HTML_AUTOCLOSE | HTML_NLALL},
{"a", 0},
{"table", HTML_NLALL | HTML_INDENT},
{"tr", HTML_NLALL | HTML_INDENT},
{"td", HTML_NLAROUND},
{"li", HTML_NLAROUND | HTML_INDENT},
{"ul", HTML_NLALL | HTML_INDENT},
{"ol", HTML_NLALL | HTML_INDENT},
{"dl", HTML_NLALL | HTML_INDENT},
{"dt", HTML_NLAROUND},
{"dd", HTML_NLAROUND | HTML_INDENT},
{"p", HTML_NLAROUND | HTML_INDENT},
{"pre", HTML_NLALL | HTML_NOINDENT},
{"var", 0},
{"cite", 0},
{"b", 0},
{"i", 0},
{"code", 0},
{"small", 0},
{"style", HTML_NLALL | HTML_INDENT},
{"math", HTML_NLALL | HTML_INDENT},
{"mrow", 0},
{"mi", 0},
{"mn", 0},
{"mo", 0},
{"msup", 0},
{"msub", 0},
{"msubsup", 0},
{"mfrac", 0},
{"msqrt", 0},
{"mfenced", 0},
{"mtable", 0},
{"mtr", 0},
{"mtd", 0},
{"munderover", 0},
{"munder", 0},
{"mover", 0},
};
/* Avoid duplicate HTML id= attributes. */
static struct ohash id_unique;
static void html_reset_internal(struct html *);
static void print_byte(struct html *, char);
static void print_endword(struct html *);
static void print_indent(struct html *);
static void print_word(struct html *, const char *);
static void print_ctag(struct html *, struct tag *);
static int print_escape(struct html *, char);
static int print_encode(struct html *, const char *, const char *, int);
static void print_href(struct html *, const char *, const char *, int);
static void print_metaf(struct html *);
void *
html_alloc(const struct manoutput *outopts)
{
struct html *h;
h = mandoc_calloc(1, sizeof(struct html));
h->tag = NULL;
h->style = outopts->style;
if ((h->base_man1 = outopts->man) == NULL)
h->base_man2 = NULL;
else if ((h->base_man2 = strchr(h->base_man1, ';')) != NULL)
*h->base_man2++ = '\0';
h->base_includes = outopts->includes;
if (outopts->fragment)
h->oflags |= HTML_FRAGMENT;
if (outopts->toc)
h->oflags |= HTML_TOC;
mandoc_ohash_init(&id_unique, 4, 0);
return h;
}
static void
html_reset_internal(struct html *h)
{
struct tag *tag;
char *cp;
unsigned int slot;
while ((tag = h->tag) != NULL) {
h->tag = tag->next;
free(tag);
}
cp = ohash_first(&id_unique, &slot);
while (cp != NULL) {
free(cp);
cp = ohash_next(&id_unique, &slot);
}
ohash_delete(&id_unique);
}
void
html_reset(void *p)
{
html_reset_internal(p);
mandoc_ohash_init(&id_unique, 4, 0);
}
void
html_free(void *p)
{
html_reset_internal(p);
free(p);
}
void
print_gen_head(struct html *h)
{
struct tag *t;
print_otag(h, TAG_META, "?", "charset", "utf-8");
if (h->style != NULL) {
print_otag(h, TAG_LINK, "?h??", "rel", "stylesheet",
h->style, "type", "text/css", "media", "all");
return;
}
/*
* Print a minimal embedded style sheet.
*/
t = print_otag(h, TAG_STYLE, "");
print_text(h, "table.head, table.foot { width: 100%; }");
print_endline(h);
print_text(h, "td.head-rtitle, td.foot-os { text-align: right; }");
print_endline(h);
print_text(h, "td.head-vol { text-align: center; }");
print_endline(h);
print_text(h, "div.Pp { margin: 1ex 0ex; }");
print_endline(h);
print_text(h, "div.Nd, div.Bf, div.Op { display: inline; }");
print_endline(h);
print_text(h, "span.Pa, span.Ad { font-style: italic; }");
print_endline(h);
print_text(h, "span.Ms { font-weight: bold; }");
print_endline(h);
print_text(h, "dl.Bl-diag ");
print_byte(h, '>');
print_text(h, " dt { font-weight: bold; }");
print_endline(h);
print_text(h, "code.Nm, code.Fl, code.Cm, code.Ic, "
"code.In, code.Fd, code.Fn,");
print_endline(h);
print_text(h, "code.Cd { font-weight: bold; "
"font-family: inherit; }");
print_tagq(h, t);
}
int
html_setfont(struct html *h, enum mandoc_esc font)
{
switch (font) {
case ESCAPE_FONTPREV:
font = h->metal;
break;
case ESCAPE_FONTITALIC:
case ESCAPE_FONTBOLD:
case ESCAPE_FONTBI:
case ESCAPE_FONTCW:
case ESCAPE_FONTROMAN:
break;
case ESCAPE_FONT:
font = ESCAPE_FONTROMAN;
break;
default:
return 0;
}
h->metal = h->metac;
h->metac = font;
return 1;
}
static void
print_metaf(struct html *h)
{
if (h->metaf) {
print_tagq(h, h->metaf);
h->metaf = NULL;
}
switch (h->metac) {
case ESCAPE_FONTITALIC:
h->metaf = print_otag(h, TAG_I, "");
break;
case ESCAPE_FONTBOLD:
h->metaf = print_otag(h, TAG_B, "");
break;
case ESCAPE_FONTBI:
h->metaf = print_otag(h, TAG_B, "");
print_otag(h, TAG_I, "");
break;
case ESCAPE_FONTCW:
h->metaf = print_otag(h, TAG_SPAN, "c", "Li");
break;
default:
break;
}
}
void
html_close_paragraph(struct html *h)
{
struct tag *t;
for (t = h->tag; t != NULL && t->closed == 0; t = t->next) {
switch(t->tag) {
case TAG_P:
case TAG_PRE:
print_tagq(h, t);
break;
case TAG_A:
print_tagq(h, t);
continue;
default:
continue;
}
break;
}
}
/*
* ROFF_nf switches to no-fill mode, ROFF_fi to fill mode.
* TOKEN_NONE does not switch. The old mode is returned.
*/
enum roff_tok
html_fillmode(struct html *h, enum roff_tok want)
{
struct tag *t;
enum roff_tok had;
for (t = h->tag; t != NULL; t = t->next)
if (t->tag == TAG_PRE)
break;
had = t == NULL ? ROFF_fi : ROFF_nf;
if (want != had) {
switch (want) {
case ROFF_fi:
print_tagq(h, t);
break;
case ROFF_nf:
html_close_paragraph(h);
print_otag(h, TAG_PRE, "");
break;
case TOKEN_NONE:
break;
default:
abort();
}
}
return had;
}
char *
html_make_id(const struct roff_node *n, int unique)
{
const struct roff_node *nch;
char *buf, *bufs, *cp;
unsigned int slot;
int suffix;
for (nch = n->child; nch != NULL; nch = nch->next)
if (nch->type != ROFFT_TEXT)
return NULL;
buf = NULL;
deroff(&buf, n);
if (buf == NULL)
return NULL;
/*
* In ID attributes, only use ASCII characters that are
* permitted in URL-fragment strings according to the
* explicit list at:
* https://url.spec.whatwg.org/#url-fragment-string
*/
for (cp = buf; *cp != '\0'; cp++)
if (isalnum((unsigned char)*cp) == 0 &&
strchr("!$&'()*+,-./:;=?@_~", *cp) == NULL)
*cp = '_';
if (unique == 0)
return buf;
/* Avoid duplicate HTML id= attributes. */
bufs = NULL;
suffix = 1;
slot = ohash_qlookup(&id_unique, buf);
cp = ohash_find(&id_unique, slot);
if (cp != NULL) {
while (cp != NULL) {
free(bufs);
if (++suffix > 127) {
free(buf);
return NULL;
}
mandoc_asprintf(&bufs, "%s_%d", buf, suffix);
slot = ohash_qlookup(&id_unique, bufs);
cp = ohash_find(&id_unique, slot);
}
free(buf);
buf = bufs;
}
ohash_insert(&id_unique, slot, buf);
return buf;
}
static int
print_escape(struct html *h, char c)
{
switch (c) {
case '<':
print_word(h, "&lt;");
break;
case '>':
print_word(h, "&gt;");
break;
case '&':
print_word(h, "&amp;");
break;
case '"':
print_word(h, "&quot;");
break;
case ASCII_NBRSP:
print_word(h, "&nbsp;");
break;
case ASCII_HYPH:
print_byte(h, '-');
break;
case ASCII_BREAK:
break;
default:
return 0;
}
return 1;
}
static int
print_encode(struct html *h, const char *p, const char *pend, int norecurse)
{
char numbuf[16];
const char *seq;
size_t sz;
int c, len, breakline, nospace;
enum mandoc_esc esc;
static const char rejs[10] = { ' ', '\\', '<', '>', '&', '"',
ASCII_NBRSP, ASCII_HYPH, ASCII_BREAK, '\0' };
if (pend == NULL)
pend = strchr(p, '\0');
breakline = 0;
nospace = 0;
while (p < pend) {
if (HTML_SKIPCHAR & h->flags && '\\' != *p) {
h->flags &= ~HTML_SKIPCHAR;
p++;
continue;
}
for (sz = strcspn(p, rejs); sz-- && p < pend; p++)
print_byte(h, *p);
if (breakline &&
(p >= pend || *p == ' ' || *p == ASCII_NBRSP)) {
print_otag(h, TAG_BR, "");
breakline = 0;
while (p < pend && (*p == ' ' || *p == ASCII_NBRSP))
p++;
continue;
}
if (p >= pend)
break;
if (*p == ' ') {
print_endword(h);
p++;
continue;
}
if (print_escape(h, *p++))
continue;
esc = mandoc_escape(&p, &seq, &len);
switch (esc) {
case ESCAPE_FONT:
case ESCAPE_FONTPREV:
case ESCAPE_FONTBOLD:
case ESCAPE_FONTITALIC:
case ESCAPE_FONTBI:
case ESCAPE_FONTCW:
case ESCAPE_FONTROMAN:
if (0 == norecurse) {
h->flags |= HTML_NOSPACE;
if (html_setfont(h, esc))
print_metaf(h);
h->flags &= ~HTML_NOSPACE;
}
continue;
case ESCAPE_SKIPCHAR:
h->flags |= HTML_SKIPCHAR;
continue;
case ESCAPE_ERROR:
continue;
default:
break;
}
if (h->flags & HTML_SKIPCHAR) {
h->flags &= ~HTML_SKIPCHAR;
continue;
}
switch (esc) {
case ESCAPE_UNICODE:
/* Skip past "u" header. */
c = mchars_num2uc(seq + 1, len - 1);
break;
case ESCAPE_NUMBERED:
c = mchars_num2char(seq, len);
if (c < 0)
continue;
break;
case ESCAPE_SPECIAL:
c = mchars_spec2cp(seq, len);
if (c <= 0)
continue;
break;
case ESCAPE_UNDEF:
c = *seq;
break;
case ESCAPE_DEVICE:
print_word(h, "html");
continue;
case ESCAPE_BREAK:
breakline = 1;
continue;
case ESCAPE_NOSPACE:
if ('\0' == *p)
nospace = 1;
continue;
case ESCAPE_OVERSTRIKE:
if (len == 0)
continue;
c = seq[len - 1];
break;
default:
continue;
}
if ((c < 0x20 && c != 0x09) ||
(c > 0x7E && c < 0xA0))
c = 0xFFFD;
if (c > 0x7E) {
(void)snprintf(numbuf, sizeof(numbuf), "&#x%.4X;", c);
print_word(h, numbuf);
} else if (print_escape(h, c) == 0)
print_byte(h, c);
}
return nospace;
}
static void
print_href(struct html *h, const char *name, const char *sec, int man)
{
struct stat sb;
const char *p, *pp;
char *filename;
if (man) {
pp = h->base_man1;
if (h->base_man2 != NULL) {
mandoc_asprintf(&filename, "%s.%s", name, sec);
if (stat(filename, &sb) == -1)
pp = h->base_man2;
free(filename);
}
} else
pp = h->base_includes;
while ((p = strchr(pp, '%')) != NULL) {
print_encode(h, pp, p, 1);
if (man && p[1] == 'S') {
if (sec == NULL)
print_byte(h, '1');
else
print_encode(h, sec, NULL, 1);
} else if ((man && p[1] == 'N') ||
(man == 0 && p[1] == 'I'))
print_encode(h, name, NULL, 1);
else
print_encode(h, p, p + 2, 1);
pp = p + 2;
}
if (*pp != '\0')
print_encode(h, pp, NULL, 1);
}
struct tag *
print_otag(struct html *h, enum htmltag tag, const char *fmt, ...)
{
va_list ap;
struct tag *t;
const char *attr;
char *arg1, *arg2;
int style_written, tflags;
tflags = htmltags[tag].flags;
/* Push this tag onto the stack of open scopes. */
if ((tflags & HTML_NOSTACK) == 0) {
t = mandoc_malloc(sizeof(struct tag));
t->tag = tag;
t->next = h->tag;
t->refcnt = 0;
t->closed = 0;
h->tag = t;
} else
t = NULL;
if (tflags & HTML_NLBEFORE)
print_endline(h);
if (h->col == 0)
print_indent(h);
else if ((h->flags & HTML_NOSPACE) == 0) {
if (h->flags & HTML_KEEP)
print_word(h, "&#x00A0;");
else {
if (h->flags & HTML_PREKEEP)
h->flags |= HTML_KEEP;
print_endword(h);
}
}
if ( ! (h->flags & HTML_NONOSPACE))
h->flags &= ~HTML_NOSPACE;
else
h->flags |= HTML_NOSPACE;
/* Print out the tag name and attributes. */
print_byte(h, '<');
print_word(h, htmltags[tag].name);
va_start(ap, fmt);
while (*fmt != '\0' && *fmt != 's') {
/* Parse attributes and arguments. */
arg1 = va_arg(ap, char *);
arg2 = NULL;
switch (*fmt++) {
case 'c':
attr = "class";
break;
case 'h':
attr = "href";
break;
case 'i':
attr = "id";
break;
case '?':
attr = arg1;
arg1 = va_arg(ap, char *);
break;
default:
abort();
}
if (*fmt == 'M')
arg2 = va_arg(ap, char *);
if (arg1 == NULL)
continue;
/* Print the attributes. */
print_byte(h, ' ');
print_word(h, attr);
print_byte(h, '=');
print_byte(h, '"');
switch (*fmt) {
case 'I':
print_href(h, arg1, NULL, 0);
fmt++;
break;
case 'M':
print_href(h, arg1, arg2, 1);
fmt++;
break;
case 'R':
print_byte(h, '#');
print_encode(h, arg1, NULL, 1);
fmt++;
break;
default:
print_encode(h, arg1, NULL, 1);
break;
}
print_byte(h, '"');
}
style_written = 0;
while (*fmt++ == 's') {
arg1 = va_arg(ap, char *);
arg2 = va_arg(ap, char *);
if (arg2 == NULL)
continue;
print_byte(h, ' ');
if (style_written == 0) {
print_word(h, "style=\"");
style_written = 1;
}
print_word(h, arg1);
print_byte(h, ':');
print_byte(h, ' ');
print_word(h, arg2);
print_byte(h, ';');
}
if (style_written)
print_byte(h, '"');
va_end(ap);
/* Accommodate for "well-formed" singleton escaping. */
if (HTML_AUTOCLOSE & htmltags[tag].flags)
print_byte(h, '/');
print_byte(h, '>');
if (tflags & HTML_NLBEGIN)
print_endline(h);
else
h->flags |= HTML_NOSPACE;
if (tflags & HTML_INDENT)
h->indent++;
if (tflags & HTML_NOINDENT)
h->noindent++;
return t;
}
static void
print_ctag(struct html *h, struct tag *tag)
{
int tflags;
if (tag->closed == 0) {
tag->closed = 1;
if (tag == h->metaf)
h->metaf = NULL;
if (tag == h->tblt)
h->tblt = NULL;
tflags = htmltags[tag->tag].flags;
if (tflags & HTML_INDENT)
h->indent--;
if (tflags & HTML_NOINDENT)
h->noindent--;
if (tflags & HTML_NLEND)
print_endline(h);
print_indent(h);
print_byte(h, '<');
print_byte(h, '/');
print_word(h, htmltags[tag->tag].name);
print_byte(h, '>');
if (tflags & HTML_NLAFTER)
print_endline(h);
}
if (tag->refcnt == 0) {
h->tag = tag->next;
free(tag);
}
}
void
print_gen_decls(struct html *h)
{
print_word(h, "<!DOCTYPE html>");
print_endline(h);
}
void
print_gen_comment(struct html *h, struct roff_node *n)
{
int wantblank;
print_word(h, "<!-- This is an automatically generated file."
" Do not edit.");
h->indent = 1;
wantblank = 0;
while (n != NULL && n->type == ROFFT_COMMENT) {
if (strstr(n->string, "-->") == NULL &&
(wantblank || *n->string != '\0')) {
print_endline(h);
print_indent(h);
print_word(h, n->string);
wantblank = *n->string != '\0';
}
n = n->next;
}
if (wantblank)
print_endline(h);
print_word(h, " -->");
print_endline(h);
h->indent = 0;
}
void
print_text(struct html *h, const char *word)
{
if (h->col && (h->flags & HTML_NOSPACE) == 0) {
if ( ! (HTML_KEEP & h->flags)) {
if (HTML_PREKEEP & h->flags)
h->flags |= HTML_KEEP;
print_endword(h);
} else
print_word(h, "&#x00A0;");
}
assert(h->metaf == NULL);
print_metaf(h);
print_indent(h);
if ( ! print_encode(h, word, NULL, 0)) {
if ( ! (h->flags & HTML_NONOSPACE))
h->flags &= ~HTML_NOSPACE;
h->flags &= ~HTML_NONEWLINE;
} else
h->flags |= HTML_NOSPACE | HTML_NONEWLINE;
if (h->metaf != NULL) {
print_tagq(h, h->metaf);
h->metaf = NULL;
}
h->flags &= ~HTML_IGNDELIM;
}
void
print_tagq(struct html *h, const struct tag *until)
{
struct tag *this, *next;
for (this = h->tag; this != NULL; this = next) {
next = this == until ? NULL : this->next;
print_ctag(h, this);
}
}
/*
* Close out all open elements up to but excluding suntil.
* Note that a paragraph just inside stays open together with it
* because paragraphs include subsequent phrasing content.
*/
void
print_stagq(struct html *h, const struct tag *suntil)
{
struct tag *this, *next;
for (this = h->tag; this != NULL; this = next) {
next = this->next;
if (this == suntil || (next == suntil &&
(this->tag == TAG_P || this->tag == TAG_PRE)))
break;
print_ctag(h, this);
}
}
/***********************************************************************
* Low level output functions.
* They implement line breaking using a short static buffer.
***********************************************************************/
/*
* Buffer one HTML output byte.
* If the buffer is full, flush and deactivate it and start a new line.
* If the buffer is inactive, print directly.
*/
static void
print_byte(struct html *h, char c)
{
if ((h->flags & HTML_BUFFER) == 0) {
putchar(c);
h->col++;
return;
}
if (h->col + h->bufcol < sizeof(h->buf)) {
h->buf[h->bufcol++] = c;
return;
}
putchar('\n');
h->col = 0;
print_indent(h);
putchar(' ');
putchar(' ');
fwrite(h->buf, h->bufcol, 1, stdout);
putchar(c);
h->col = (h->indent + 1) * 2 + h->bufcol + 1;
h->bufcol = 0;
h->flags &= ~HTML_BUFFER;
}
/*
* If something was printed on the current output line, end it.
* Not to be called right after print_indent().
*/
void
print_endline(struct html *h)
{
if (h->col == 0)
return;
if (h->bufcol) {
putchar(' ');
fwrite(h->buf, h->bufcol, 1, stdout);
h->bufcol = 0;
}
putchar('\n');
h->col = 0;
h->flags |= HTML_NOSPACE;
h->flags &= ~HTML_BUFFER;
}
/*
* Flush the HTML output buffer.
* If it is inactive, activate it.
*/
static void
print_endword(struct html *h)
{
if (h->noindent) {
print_byte(h, ' ');
return;
}
if ((h->flags & HTML_BUFFER) == 0) {
h->col++;
h->flags |= HTML_BUFFER;
} else if (h->bufcol) {
putchar(' ');
fwrite(h->buf, h->bufcol, 1, stdout);
h->col += h->bufcol + 1;
}
h->bufcol = 0;
}
/*
* If at the beginning of a new output line,
* perform indentation and mark the line as containing output.
* Make sure to really produce some output right afterwards,
* but do not use print_otag() for producing it.
*/
static void
print_indent(struct html *h)
{
size_t i;
if (h->col)
return;
if (h->noindent == 0) {
h->col = h->indent * 2;
for (i = 0; i < h->col; i++)
putchar(' ');
}
h->flags &= ~HTML_NOSPACE;
}
/*
* Print or buffer some characters
* depending on the current HTML output buffer state.
*/
static void
print_word(struct html *h, const char *cp)
{
while (*cp != '\0')
print_byte(h, *cp++);
}
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