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freebsd-skq/contrib/mdocml/html.c
bapt a6f1e1ee5b Import mandoc snapshot 2017-06-08 
It implements missing man(7) macros used in base by kerberos/ntp and makes them
supported by mandoc.

This import should have been done before the removal of groff.

Reported by:	gordon
2017-06-08 19:40:00 +00:00

962 lines
18 KiB
C
Raw Blame History

/* $Id: html.c,v 1.213 2017/06/08 12:54:58 schwarze Exp $ */
/*
* Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
* Copyright (c) 2011-2015, 2017 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 <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_aux.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},
{"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},
{"colgroup", HTML_NLALL | HTML_INDENT},
{"col", HTML_NOSTACK | HTML_AUTOCLOSE | HTML_NLALL},
{"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},
{"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},
{"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},
};
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 a2width(const char *, struct roffsu *);
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 *, enum mandoc_esc);
void *
html_alloc(const struct manoutput *outopts)
{
struct html *h;
h = mandoc_calloc(1, sizeof(struct html));
h->tag = NULL;
h->style = outopts->style;
h->base_man = outopts->man;
h->base_includes = outopts->includes;
if (outopts->fragment)
h->oflags |= HTML_FRAGMENT;
return h;
}
void
html_free(void *p)
{
struct tag *tag;
struct html *h;
h = (struct html *)p;
while ((tag = h->tag) != NULL) {
h->tag = tag->next;
free(tag);
}
free(h);
}
void
print_gen_head(struct html *h)
{
struct tag *t;
print_otag(h, TAG_META, "?", "charset", "utf-8");
/*
* Print a default 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_tagq(h, t);
if (h->style)
print_otag(h, TAG_LINK, "?h??", "rel", "stylesheet",
h->style, "type", "text/css", "media", "all");
}
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:
case ESCAPE_FONTROMAN:
font = HTMLFONT_NONE;
break;
default:
abort();
}
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, "");
break;
case HTMLFONT_BOLD:
h->metaf = print_otag(h, TAG_B, "");
break;
case HTMLFONT_BI:
h->metaf = print_otag(h, TAG_B, "");
print_otag(h, TAG_I, "");
break;
default:
break;
}
}
char *
html_make_id(const struct roff_node *n)
{
const struct roff_node *nch;
char *buf, *cp;
for (nch = n->child; nch != NULL; nch = nch->next)
if (nch->type != ROFFT_TEXT)
return NULL;
buf = NULL;
deroff(&buf, n);
/* http://www.w3.org/TR/html5/dom.html#the-id-attribute */
for (cp = buf; *cp != '\0'; cp++)
if (*cp == ' ')
*cp = '_';
return buf;
}
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:
case ESCAPE_NUMBERED:
case ESCAPE_SPECIAL:
case ESCAPE_OVERSTRIKE:
if (skip)
skip = 0;
else
sz++;
break;
case ESCAPE_SKIPCHAR:
skip = 1;
break;
default:
break;
}
}
return sz;
}
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];
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' };
if (pend == NULL)
pend = strchr(p, '\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++)
if (*p == ' ')
print_endword(h);
else
print_byte(h, *p);
if (p >= pend)
break;
if (print_escape(h, *p++))
continue;
esc = mandoc_escape(&p, &seq, &len);
if (ESCAPE_ERROR == esc)
break;
switch (esc) {
case ESCAPE_FONT:
case ESCAPE_FONTPREV:
case ESCAPE_FONTBOLD:
case ESCAPE_FONTITALIC:
case ESCAPE_FONTBI:
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(seq, len);
if (c <= 0)
continue;
break;
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), "&#%d;", 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)
{
const char *p, *pp;
pp = man ? h->base_man : 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 roffsu mysu, *su;
char numbuf[16];
struct tag *t;
const char *attr;
char *arg1, *arg2;
double v;
int i, have_style, 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;
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, "&#160;");
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);
have_style = 0;
while (*fmt != '\0') {
if (*fmt == 's') {
have_style = 1;
fmt++;
break;
}
/* Parse a non-style attribute and its arguments. */
arg1 = va_arg(ap, char *);
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();
}
arg2 = NULL;
if (*fmt == 'M')
arg2 = va_arg(ap, char *);
if (arg1 == NULL)
continue;
/* Print the non-style 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;
case 'T':
print_encode(h, arg1, NULL, 1);
print_word(h, "\" title=\"");
print_encode(h, arg1, NULL, 1);
fmt++;
break;
default:
print_encode(h, arg1, NULL, 1);
break;
}
print_byte(h, '"');
}
/* Print out styles. */
while (*fmt != '\0') {
arg1 = NULL;
su = NULL;
/* First letter: input argument type. */
switch (*fmt++) {
case 'h':
i = va_arg(ap, int);
su = &mysu;
SCALE_HS_INIT(su, i);
break;
case 's':
arg1 = va_arg(ap, char *);
break;
case 'u':
su = va_arg(ap, struct roffsu *);
break;
case 'v':
i = va_arg(ap, int);
su = &mysu;
SCALE_VS_INIT(su, i);
break;
case 'w':
if ((arg2 = va_arg(ap, char *)) == NULL)
break;
su = &mysu;
a2width(arg2, su);
if (*fmt == '+') {
/* Increase to make even bold text fit. */
su->scale *= 1.2;
/* Add padding. */
su->scale += 3.0;
fmt++;
}
if (*fmt == '-') {
su->scale *= -1.0;
fmt++;
}
break;
default:
abort();
}
/* Second letter: style name. */
switch (*fmt++) {
case 'b':
attr = "margin-bottom";
break;
case 'h':
attr = "height";
break;
case 'i':
attr = "text-indent";
break;
case 'l':
attr = "margin-left";
break;
case 't':
attr = "margin-top";
break;
case 'w':
attr = "width";
break;
case 'W':
attr = "min-width";
break;
case '?':
attr = arg1;
arg1 = va_arg(ap, char *);
break;
default:
abort();
}
if (su == NULL && arg1 == NULL)
continue;
if (have_style == 1)
print_word(h, " style=\"");
else
print_byte(h, ' ');
print_word(h, attr);
print_byte(h, ':');
print_byte(h, ' ');
if (su != NULL) {
v = su->scale;
if (su->unit == SCALE_MM && (v /= 100.0) == 0.0)
v = 1.0;
else if (su->unit == SCALE_BU)
v /= 24.0;
(void)snprintf(numbuf, sizeof(numbuf), "%.2f", v);
print_word(h, numbuf);
print_word(h, roffscales[su->unit]);
} else
print_word(h, arg1);
print_byte(h, ';');
have_style = 2;
}
if (have_style == 2)
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;
/*
* 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;
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);
h->tag = tag->next;
free(tag);
}
void
print_gen_decls(struct html *h)
{
print_word(h, "<!DOCTYPE html>");
print_endline(h);
}
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, "&#160;");
}
assert(NULL == h->metaf);
switch (h->metac) {
case HTMLFONT_ITALIC:
h->metaf = print_otag(h, TAG_I, "");
break;
case HTMLFONT_BOLD:
h->metaf = print_otag(h, TAG_B, "");
break;
case HTMLFONT_BI:
h->metaf = print_otag(h, TAG_B, "");
print_otag(h, TAG_I, "");
break;
default:
print_indent(h);
break;
}
assert(word);
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) {
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->tag) != NULL) {
print_ctag(h, tag);
if (until && tag == until)
return;
}
}
void
print_stagq(struct html *h, const struct tag *suntil)
{
struct tag *tag;
while ((tag = h->tag) != NULL) {
if (suntil && tag == suntil)
return;
print_ctag(h, tag);
}
}
void
print_paragraph(struct html *h)
{
struct tag *t;
t = print_otag(h, TAG_DIV, "c", "Pp");
print_tagq(h, t);
}
/***********************************************************************
* 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++);
}
/*
* Calculate the scaling unit passed in a `-width' argument. This uses
* either a native scaling unit (e.g., 1i, 2m) or the string length of
* the value.
*/
static void
a2width(const char *p, struct roffsu *su)
{
const char *end;
end = a2roffsu(p, su, SCALE_MAX);
if (end == NULL || *end != '\0') {
su->unit = SCALE_EN;
su->scale = html_strlen(p);
} else if (su->scale < 0.0)
su->scale = 0.0;
}
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