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freebsd/contrib/mdocml/html.c
2014-12-25 21:56:56 +00:00

760 lines
15 KiB
C

/* $Id: html.c,v 1.183 2014/12/02 10:08:06 schwarze Exp $ */
/*
* Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
* Copyright (c) 2011, 2012, 2013, 2014 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 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 "config.h"
#include <sys/types.h>
#include <assert.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "mandoc.h"
#include "mandoc_aux.h"
#include "out.h"
#include "html.h"
#include "main.h"
struct htmldata {
const char *name;
int flags;
#define HTML_CLRLINE (1 << 0)
#define HTML_NOSTACK (1 << 1)
#define HTML_AUTOCLOSE (1 << 2) /* Tag has auto-closure. */
};
static const struct htmldata htmltags[TAG_MAX] = {
{"html", HTML_CLRLINE}, /* TAG_HTML */
{"head", HTML_CLRLINE}, /* TAG_HEAD */
{"body", HTML_CLRLINE}, /* TAG_BODY */
{"meta", HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_META */
{"title", HTML_CLRLINE}, /* TAG_TITLE */
{"div", HTML_CLRLINE}, /* TAG_DIV */
{"h1", 0}, /* TAG_H1 */
{"h2", 0}, /* TAG_H2 */
{"span", 0}, /* TAG_SPAN */
{"link", HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_LINK */
{"br", HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_BR */
{"a", 0}, /* TAG_A */
{"table", HTML_CLRLINE}, /* TAG_TABLE */
{"tbody", HTML_CLRLINE}, /* TAG_TBODY */
{"col", HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_COL */
{"tr", HTML_CLRLINE}, /* TAG_TR */
{"td", HTML_CLRLINE}, /* TAG_TD */
{"li", HTML_CLRLINE}, /* TAG_LI */
{"ul", HTML_CLRLINE}, /* TAG_UL */
{"ol", HTML_CLRLINE}, /* TAG_OL */
{"dl", HTML_CLRLINE}, /* TAG_DL */
{"dt", HTML_CLRLINE}, /* TAG_DT */
{"dd", HTML_CLRLINE}, /* TAG_DD */
{"blockquote", HTML_CLRLINE}, /* TAG_BLOCKQUOTE */
{"pre", HTML_CLRLINE }, /* TAG_PRE */
{"b", 0 }, /* TAG_B */
{"i", 0 }, /* TAG_I */
{"code", 0 }, /* TAG_CODE */
{"small", 0 }, /* TAG_SMALL */
{"style", HTML_CLRLINE}, /* TAG_STYLE */
{"math", HTML_CLRLINE}, /* TAG_MATH */
{"mrow", 0}, /* TAG_MROW */
{"mi", 0}, /* TAG_MI */
{"mo", 0}, /* TAG_MO */
{"msup", 0}, /* TAG_MSUP */
{"msub", 0}, /* TAG_MSUB */
{"msubsup", 0}, /* TAG_MSUBSUP */
{"mfrac", 0}, /* TAG_MFRAC */
{"msqrt", 0}, /* TAG_MSQRT */
{"mfenced", 0}, /* TAG_MFENCED */
{"mtable", 0}, /* TAG_MTABLE */
{"mtr", 0}, /* TAG_MTR */
{"mtd", 0}, /* TAG_MTD */
{"munderover", 0}, /* TAG_MUNDEROVER */
{"munder", 0}, /* TAG_MUNDER*/
{"mover", 0}, /* TAG_MOVER*/
};
static const char *const htmlattrs[ATTR_MAX] = {
"name", /* ATTR_NAME */
"rel", /* ATTR_REL */
"href", /* ATTR_HREF */
"type", /* ATTR_TYPE */
"media", /* ATTR_MEDIA */
"class", /* ATTR_CLASS */
"style", /* ATTR_STYLE */
"id", /* ATTR_ID */
"colspan", /* ATTR_COLSPAN */
"charset", /* ATTR_CHARSET */
"open", /* ATTR_OPEN */
"close", /* ATTR_CLOSE */
"mathvariant", /* ATTR_MATHVARIANT */
};
static const char *const roffscales[SCALE_MAX] = {
"cm", /* SCALE_CM */
"in", /* SCALE_IN */
"pc", /* SCALE_PC */
"pt", /* SCALE_PT */
"em", /* SCALE_EM */
"em", /* SCALE_MM */
"ex", /* SCALE_EN */
"ex", /* SCALE_BU */
"em", /* SCALE_VS */
"ex", /* SCALE_FS */
};
static void bufncat(struct html *, const char *, size_t);
static void print_ctag(struct html *, enum htmltag);
static int print_escape(char);
static int print_encode(struct html *, const char *, int);
static void print_metaf(struct html *, enum mandoc_esc);
static void print_attr(struct html *, const char *, const char *);
void *
html_alloc(const struct mchars *mchars, char *outopts)
{
struct html *h;
const char *toks[5];
char *v;
toks[0] = "style";
toks[1] = "man";
toks[2] = "includes";
toks[3] = "fragment";
toks[4] = NULL;
h = mandoc_calloc(1, sizeof(struct html));
h->tags.head = NULL;
h->symtab = mchars;
while (outopts && *outopts)
switch (getsubopt(&outopts, UNCONST(toks), &v)) {
case 0:
h->style = v;
break;
case 1:
h->base_man = v;
break;
case 2:
h->base_includes = v;
break;
case 3:
h->oflags |= HTML_FRAGMENT;
break;
default:
break;
}
return(h);
}
void
html_free(void *p)
{
struct tag *tag;
struct html *h;
h = (struct html *)p;
while ((tag = h->tags.head) != NULL) {
h->tags.head = tag->next;
free(tag);
}
free(h);
}
void
print_gen_head(struct html *h)
{
struct htmlpair tag[4];
struct tag *t;
tag[0].key = ATTR_CHARSET;
tag[0].val = "utf-8";
print_otag(h, TAG_META, 1, tag);
/*
* Print a default style-sheet.
*/
t = print_otag(h, TAG_STYLE, 0, NULL);
print_text(h, "table.head, table.foot { width: 100%; }\n"
"td.head-rtitle, td.foot-os { text-align: right; }\n"
"td.head-vol { text-align: center; }\n"
"table.foot td { width: 50%; }\n"
"table.head td { width: 33%; }\n"
"div.spacer { margin: 1em 0; }\n");
print_tagq(h, t);
if (h->style) {
tag[0].key = ATTR_REL;
tag[0].val = "stylesheet";
tag[1].key = ATTR_HREF;
tag[1].val = h->style;
tag[2].key = ATTR_TYPE;
tag[2].val = "text/css";
tag[3].key = ATTR_MEDIA;
tag[3].val = "all";
print_otag(h, TAG_LINK, 4, tag);
}
}
static void
print_metaf(struct html *h, enum mandoc_esc deco)
{
enum htmlfont font;
switch (deco) {
case ESCAPE_FONTPREV:
font = h->metal;
break;
case ESCAPE_FONTITALIC:
font = HTMLFONT_ITALIC;
break;
case ESCAPE_FONTBOLD:
font = HTMLFONT_BOLD;
break;
case ESCAPE_FONTBI:
font = HTMLFONT_BI;
break;
case ESCAPE_FONT:
/* FALLTHROUGH */
case ESCAPE_FONTROMAN:
font = HTMLFONT_NONE;
break;
default:
abort();
/* NOTREACHED */
}
if (h->metaf) {
print_tagq(h, h->metaf);
h->metaf = NULL;
}
h->metal = h->metac;
h->metac = font;
switch (font) {
case HTMLFONT_ITALIC:
h->metaf = print_otag(h, TAG_I, 0, NULL);
break;
case HTMLFONT_BOLD:
h->metaf = print_otag(h, TAG_B, 0, NULL);
break;
case HTMLFONT_BI:
h->metaf = print_otag(h, TAG_B, 0, NULL);
print_otag(h, TAG_I, 0, NULL);
break;
default:
break;
}
}
int
html_strlen(const char *cp)
{
size_t rsz;
int skip, sz;
/*
* Account for escaped sequences within string length
* calculations. This follows the logic in term_strlen() as we
* must calculate the width of produced strings.
* Assume that characters are always width of "1". This is
* hacky, but it gets the job done for approximation of widths.
*/
sz = 0;
skip = 0;
while (1) {
rsz = strcspn(cp, "\\");
if (rsz) {
cp += rsz;
if (skip) {
skip = 0;
rsz--;
}
sz += rsz;
}
if ('\0' == *cp)
break;
cp++;
switch (mandoc_escape(&cp, NULL, NULL)) {
case ESCAPE_ERROR:
return(sz);
case ESCAPE_UNICODE:
/* FALLTHROUGH */
case ESCAPE_NUMBERED:
/* FALLTHROUGH */
case ESCAPE_SPECIAL:
if (skip)
skip = 0;
else
sz++;
break;
case ESCAPE_SKIPCHAR:
skip = 1;
break;
default:
break;
}
}
return(sz);
}
static int
print_escape(char c)
{
switch (c) {
case '<':
printf("&lt;");
break;
case '>':
printf("&gt;");
break;
case '&':
printf("&amp;");
break;
case '"':
printf("&quot;");
break;
case ASCII_NBRSP:
putchar('-');
break;
case ASCII_HYPH:
putchar('-');
/* FALLTHROUGH */
case ASCII_BREAK:
break;
default:
return(0);
}
return(1);
}
static int
print_encode(struct html *h, const char *p, int norecurse)
{
size_t sz;
int c, len, nospace;
const char *seq;
enum mandoc_esc esc;
static const char rejs[9] = { '\\', '<', '>', '&', '"',
ASCII_NBRSP, ASCII_HYPH, ASCII_BREAK, '\0' };
nospace = 0;
while ('\0' != *p) {
if (HTML_SKIPCHAR & h->flags && '\\' != *p) {
h->flags &= ~HTML_SKIPCHAR;
p++;
continue;
}
sz = strcspn(p, rejs);
fwrite(p, 1, sz, stdout);
p += (int)sz;
if ('\0' == *p)
break;
if (print_escape(*p++))
continue;
esc = mandoc_escape(&p, &seq, &len);
if (ESCAPE_ERROR == esc)
break;
switch (esc) {
case ESCAPE_FONT:
/* FALLTHROUGH */
case ESCAPE_FONTPREV:
/* FALLTHROUGH */
case ESCAPE_FONTBOLD:
/* FALLTHROUGH */
case ESCAPE_FONTITALIC:
/* FALLTHROUGH */
case ESCAPE_FONTBI:
/* FALLTHROUGH */
case ESCAPE_FONTROMAN:
if (0 == norecurse)
print_metaf(h, esc);
continue;
case ESCAPE_SKIPCHAR:
h->flags |= HTML_SKIPCHAR;
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(h->symtab, seq, len);
if (c <= 0)
continue;
break;
case ESCAPE_NOSPACE:
if ('\0' == *p)
nospace = 1;
continue;
default:
continue;
}
if ((c < 0x20 && c != 0x09) ||
(c > 0x7E && c < 0xA0))
c = 0xFFFD;
if (c > 0x7E)
printf("&#%d;", c);
else if ( ! print_escape(c))
putchar(c);
}
return(nospace);
}
static void
print_attr(struct html *h, const char *key, const char *val)
{
printf(" %s=\"", key);
(void)print_encode(h, val, 1);
putchar('\"');
}
struct tag *
print_otag(struct html *h, enum htmltag tag,
int sz, const struct htmlpair *p)
{
int i;
struct tag *t;
/* Push this tags onto the stack of open scopes. */
if ( ! (HTML_NOSTACK & htmltags[tag].flags)) {
t = mandoc_malloc(sizeof(struct tag));
t->tag = tag;
t->next = h->tags.head;
h->tags.head = t;
} else
t = NULL;
if ( ! (HTML_NOSPACE & h->flags))
if ( ! (HTML_CLRLINE & htmltags[tag].flags)) {
/* Manage keeps! */
if ( ! (HTML_KEEP & h->flags)) {
if (HTML_PREKEEP & h->flags)
h->flags |= HTML_KEEP;
putchar(' ');
} else
printf("&#160;");
}
if ( ! (h->flags & HTML_NONOSPACE))
h->flags &= ~HTML_NOSPACE;
else
h->flags |= HTML_NOSPACE;
/* Print out the tag name and attributes. */
printf("<%s", htmltags[tag].name);
for (i = 0; i < sz; i++)
print_attr(h, htmlattrs[p[i].key], p[i].val);
/* Accommodate for "well-formed" singleton escaping. */
if (HTML_AUTOCLOSE & htmltags[tag].flags)
putchar('/');
putchar('>');
h->flags |= HTML_NOSPACE;
if ((HTML_AUTOCLOSE | HTML_CLRLINE) & htmltags[tag].flags)
putchar('\n');
return(t);
}
static void
print_ctag(struct html *h, enum htmltag tag)
{
printf("</%s>", htmltags[tag].name);
if (HTML_CLRLINE & htmltags[tag].flags) {
h->flags |= HTML_NOSPACE;
putchar('\n');
}
}
void
print_gen_decls(struct html *h)
{
puts("<!DOCTYPE html>");
}
void
print_text(struct html *h, const char *word)
{
if ( ! (HTML_NOSPACE & h->flags)) {
/* Manage keeps! */
if ( ! (HTML_KEEP & h->flags)) {
if (HTML_PREKEEP & h->flags)
h->flags |= HTML_KEEP;
putchar(' ');
} else
printf("&#160;");
}
assert(NULL == h->metaf);
switch (h->metac) {
case HTMLFONT_ITALIC:
h->metaf = print_otag(h, TAG_I, 0, NULL);
break;
case HTMLFONT_BOLD:
h->metaf = print_otag(h, TAG_B, 0, NULL);
break;
case HTMLFONT_BI:
h->metaf = print_otag(h, TAG_B, 0, NULL);
print_otag(h, TAG_I, 0, NULL);
break;
default:
break;
}
assert(word);
if ( ! print_encode(h, word, 0)) {
if ( ! (h->flags & HTML_NONOSPACE))
h->flags &= ~HTML_NOSPACE;
h->flags &= ~HTML_NONEWLINE;
} else
h->flags |= HTML_NOSPACE | HTML_NONEWLINE;
if (h->metaf) {
print_tagq(h, h->metaf);
h->metaf = NULL;
}
h->flags &= ~HTML_IGNDELIM;
}
void
print_tagq(struct html *h, const struct tag *until)
{
struct tag *tag;
while ((tag = h->tags.head) != NULL) {
/*
* Remember to close out and nullify the current
* meta-font and table, if applicable.
*/
if (tag == h->metaf)
h->metaf = NULL;
if (tag == h->tblt)
h->tblt = NULL;
print_ctag(h, tag->tag);
h->tags.head = tag->next;
free(tag);
if (until && tag == until)
return;
}
}
void
print_stagq(struct html *h, const struct tag *suntil)
{
struct tag *tag;
while ((tag = h->tags.head) != NULL) {
if (suntil && tag == suntil)
return;
/*
* Remember to close out and nullify the current
* meta-font and table, if applicable.
*/
if (tag == h->metaf)
h->metaf = NULL;
if (tag == h->tblt)
h->tblt = NULL;
print_ctag(h, tag->tag);
h->tags.head = tag->next;
free(tag);
}
}
void
print_paragraph(struct html *h)
{
struct tag *t;
struct htmlpair tag;
PAIR_CLASS_INIT(&tag, "spacer");
t = print_otag(h, TAG_DIV, 1, &tag);
print_tagq(h, t);
}
void
bufinit(struct html *h)
{
h->buf[0] = '\0';
h->buflen = 0;
}
void
bufcat_style(struct html *h, const char *key, const char *val)
{
bufcat(h, key);
bufcat(h, ":");
bufcat(h, val);
bufcat(h, ";");
}
void
bufcat(struct html *h, const char *p)
{
/*
* XXX This is broken and not easy to fix.
* When using the -Oincludes option, buffmt_includes()
* may pass in strings overrunning BUFSIZ, causing a crash.
*/
h->buflen = strlcat(h->buf, p, BUFSIZ);
assert(h->buflen < BUFSIZ);
}
void
bufcat_fmt(struct html *h, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
(void)vsnprintf(h->buf + (int)h->buflen,
BUFSIZ - h->buflen - 1, fmt, ap);
va_end(ap);
h->buflen = strlen(h->buf);
}
static void
bufncat(struct html *h, const char *p, size_t sz)
{
assert(h->buflen + sz + 1 < BUFSIZ);
strncat(h->buf, p, sz);
h->buflen += sz;
}
void
buffmt_includes(struct html *h, const char *name)
{
const char *p, *pp;
pp = h->base_includes;
bufinit(h);
while (NULL != (p = strchr(pp, '%'))) {
bufncat(h, pp, (size_t)(p - pp));
switch (*(p + 1)) {
case'I':
bufcat(h, name);
break;
default:
bufncat(h, p, 2);
break;
}
pp = p + 2;
}
if (pp)
bufcat(h, pp);
}
void
buffmt_man(struct html *h, const char *name, const char *sec)
{
const char *p, *pp;
pp = h->base_man;
bufinit(h);
while (NULL != (p = strchr(pp, '%'))) {
bufncat(h, pp, (size_t)(p - pp));
switch (*(p + 1)) {
case 'S':
bufcat(h, sec ? sec : "1");
break;
case 'N':
bufcat_fmt(h, "%s", name);
break;
default:
bufncat(h, p, 2);
break;
}
pp = p + 2;
}
if (pp)
bufcat(h, pp);
}
void
bufcat_su(struct html *h, const char *p, const struct roffsu *su)
{
double v;
v = su->scale;
if (SCALE_MM == su->unit && 0.0 == (v /= 100.0))
v = 1.0;
else if (SCALE_BU == su->unit)
v /= 24.0;
bufcat_fmt(h, "%s: %.2f%s;", p, v, roffscales[su->unit]);
}
void
bufcat_id(struct html *h, const char *src)
{
/* Cf. <http://www.w3.org/TR/html4/types.html#h-6.2>. */
while ('\0' != *src)
bufcat_fmt(h, "%.2x", *src++);
}