Return to html.c CVS log

Up to [cvsweb.bsd.lv] / mandoc

Remove stupid outer DIV tag in favour of regular BODY and HTML that can
be handled in CSS.

Clarified "lit" tag (will be the subject of future clarification).

Removed CSS2 note in mandoc.1, which is no longer the case.

/*	$Id: html.c,v 1.115 2010/12/15 15:59:23 kristaps Exp $ */
/*
 * Copyright (c) 2008, 2009, 2010 Kristaps Dzonsons <kristaps@bsd.lv>
 *
 * 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.
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#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 "out.h"
#include "chars.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 */
};

static	const char	*const htmlfonts[HTMLFONT_MAX] = {
	"roman",
	"bold",
	"italic"
};

static	const char	*const htmlattrs[ATTR_MAX] = {
	"http-equiv",
	"content",
	"name",
	"rel",
	"href",
	"type",
	"media",
	"class",
	"style",
	"width",
	"valign",
	"target",
	"id",
	"summary",
};

static	void		  print_spec(struct html *, enum roffdeco,
				const char *, size_t);
static	void		  print_res(struct html *, const char *, size_t);
static	void		  print_ctag(struct html *, enum htmltag);
static	void		  print_doctype(struct html *);
static	void		  print_xmltype(struct html *);
static	int		  print_encode(struct html *, const char *, int);
static	void		  print_metaf(struct html *, enum roffdeco);
static	void		  print_attr(struct html *, 
				const char *, const char *);
static	void		 *ml_alloc(char *, enum htmltype);


static void *
ml_alloc(char *outopts, enum htmltype type)
{
	struct html	*h;
	const char	*toks[4];
	char		*v;

	toks[0] = "style";
	toks[1] = "man";
	toks[2] = "includes";
	toks[3] = NULL;

	h = calloc(1, sizeof(struct html));
	if (NULL == h) {
		perror(NULL);
		exit((int)MANDOCLEVEL_SYSERR);
	}

	h->type = type;
	h->tags.head = NULL;
	h->symtab = chars_init(CHARS_HTML);

	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;
		default:
			break;
		}

	return(h);
}

void *
html_alloc(char *outopts)
{

	return(ml_alloc(outopts, HTML_HTML_4_01_STRICT));
}


void *
xhtml_alloc(char *outopts)
{

	return(ml_alloc(outopts, HTML_XHTML_1_0_STRICT));
}


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);
	}
	
	if (h->symtab)
		chars_free(h->symtab);

	free(h);
}


void
print_gen_head(struct html *h)
{
	struct htmlpair	 tag[4];

	tag[0].key = ATTR_HTTPEQUIV;
	tag[0].val = "Content-Type";
	tag[1].key = ATTR_CONTENT;
	tag[1].val = "text/html; charset=utf-8";
	print_otag(h, TAG_META, 2, tag);

	tag[0].key = ATTR_NAME;
	tag[0].val = "resource-type";
	tag[1].key = ATTR_CONTENT;
	tag[1].val = "document";
	print_otag(h, TAG_META, 2, tag);

	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_spec(struct html *h, enum roffdeco d, const char *p, size_t len)
{
	int		 cp;
	const char	*rhs;
	size_t		 sz;

	if ((cp = chars_spec2cp(h->symtab, p, len)) > 0) {
		printf("&#%d;", cp);
		return;
	} else if (-1 == cp && DECO_SSPECIAL == d) {
		fwrite(p, 1, len, stdout);
		return;
	} else if (-1 == cp)
		return;

	if (NULL != (rhs = chars_spec2str(h->symtab, p, len, &sz)))
		fwrite(rhs, 1, sz, stdout);
}


static void
print_res(struct html *h, const char *p, size_t len)
{
	int		 cp;
	const char	*rhs;
	size_t		 sz;

	if ((cp = chars_res2cp(h->symtab, p, len)) > 0) {
		printf("&#%d;", cp);
		return;
	} else if (-1 == cp)
		return;

	if (NULL != (rhs = chars_res2str(h->symtab, p, len, &sz)))
		fwrite(rhs, 1, sz, stdout);
}


struct tag *
print_ofont(struct html *h, enum htmlfont font)
{
	struct htmlpair	 tag;

	h->metal = h->metac;
	h->metac = font;

	/* FIXME: DECO_ROMAN should just close out preexisting. */

	if (h->metaf && h->tags.head == h->metaf)
		print_tagq(h, h->metaf);

	PAIR_CLASS_INIT(&tag, htmlfonts[font]);
	h->metaf = print_otag(h, TAG_SPAN, 1, &tag);
	return(h->metaf);
}


static void
print_metaf(struct html *h, enum roffdeco deco)
{
	enum htmlfont	 font;

	switch (deco) {
	case (DECO_PREVIOUS):
		font = h->metal;
		break;
	case (DECO_ITALIC):
		font = HTMLFONT_ITALIC;
		break;
	case (DECO_BOLD):
		font = HTMLFONT_BOLD;
		break;
	case (DECO_ROMAN):
		font = HTMLFONT_NONE;
		break;
	default:
		abort();
		/* NOTREACHED */
	}

	(void)print_ofont(h, font);
}


static int
print_encode(struct html *h, const char *p, int norecurse)
{
	size_t		 sz;
	int		 len, nospace;
	const char	*seq;
	enum roffdeco	 deco;
	static const char rejs[6] = { '\\', '<', '>', '&', ASCII_HYPH, '\0' };

	nospace = 0;

	for (; *p; p++) {
		sz = strcspn(p, rejs);

		fwrite(p, 1, sz, stdout);
		p += /* LINTED */
			sz;

		if ('<' == *p) {
			printf("&lt;");
			continue;
		} else if ('>' == *p) {
			printf("&gt;");
			continue;
		} else if ('&' == *p) {
			printf("&amp;");
			continue;
		} else if (ASCII_HYPH == *p) {
			/*
			 * Note: "soft hyphens" aren't graphically
			 * displayed when not breaking the text; we want
			 * them to be displayed.
			 */
			/*printf("&#173;");*/
			putchar('-');
			continue;
		} else if ('\0' == *p)
			break;

		seq = ++p;
		len = a2roffdeco(&deco, &seq, &sz);

		switch (deco) {
		case (DECO_RESERVED):
			print_res(h, seq, sz);
			break;
		case (DECO_SSPECIAL):
			/* FALLTHROUGH */
		case (DECO_SPECIAL):
			print_spec(h, deco, seq, sz);
			break;
		case (DECO_PREVIOUS):
			/* FALLTHROUGH */
		case (DECO_BOLD):
			/* FALLTHROUGH */
		case (DECO_ITALIC):
			/* FALLTHROUGH */
		case (DECO_ROMAN):
			if (norecurse)
				break;
			print_metaf(h, deco);
			break;
		default:
			break;
		}

		p += len - 1;

		if (DECO_NOSPACE == deco && '\0' == *(p + 1))
			nospace = 1;
	}

	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 = malloc(sizeof(struct tag));
		if (NULL == t) {
			perror(NULL);
			exit((int)MANDOCLEVEL_SYSERR);
		}
		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);

	/* Add non-overridable attributes. */

	if (TAG_HTML == tag && HTML_XHTML_1_0_STRICT == h->type) {
		print_attr(h, "xmlns", "http://www.w3.org/1999/xhtml");
		print_attr(h, "xml:lang", "en");
		print_attr(h, "lang", "en");
	}

	/* Accomodate for XML "well-formed" singleton escaping. */

	if (HTML_AUTOCLOSE & htmltags[tag].flags)
		switch (h->type) {
		case (HTML_XHTML_1_0_STRICT):
			putchar('/');
			break;
		default:
			break;
		}

	putchar('>');

	h->flags |= HTML_NOSPACE;
	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)
{

	print_xmltype(h);
	print_doctype(h);
}


static void
print_xmltype(struct html *h)
{

	if (HTML_XHTML_1_0_STRICT == h->type)
		printf("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
}


static void
print_doctype(struct html *h)
{
	const char	*doctype;
	const char	*dtd;
	const char	*name;

	switch (h->type) {
	case (HTML_HTML_4_01_STRICT):
		name = "HTML";
		doctype = "-//W3C//DTD HTML 4.01//EN";
		dtd = "http://www.w3.org/TR/html4/strict.dtd";
		break;
	default:
		name = "html";
		doctype = "-//W3C//DTD XHTML 1.0 Strict//EN";
		dtd = "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";
		break;
	}

	printf("<!DOCTYPE %s PUBLIC \"%s\" \"%s\">\n", 
			name, doctype, dtd);
}


void
print_text(struct html *h, const char *word)
{

	if (word[0] && '\0' == word[1])
		switch (word[0]) {
		case('.'):
			/* FALLTHROUGH */
		case(','):
			/* FALLTHROUGH */
		case(';'):
			/* FALLTHROUGH */
		case(':'):
			/* FALLTHROUGH */
		case('?'):
			/* FALLTHROUGH */
		case('!'):
			/* FALLTHROUGH */
		case(')'):
			/* FALLTHROUGH */
		case(']'):
			if ( ! (HTML_IGNDELIM & h->flags))
				h->flags |= HTML_NOSPACE;
			break;
		default:
			break;
		}

	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(word);
	if ( ! print_encode(h, word, 0))
		if ( ! (h->flags & HTML_NONOSPACE))
			h->flags &= ~HTML_NOSPACE;

	h->flags &= ~HTML_IGNDELIM;

	/* 
	 * Note that we don't process the pipe: the parser sees it as
	 * punctuation, but we don't in terms of typography.
	 */
	if (word[0] && '\0' == word[1])
		switch (word[0]) {
		case('('):
			/* FALLTHROUGH */
		case('['):
			h->flags |= HTML_NOSPACE;
			break;
		default:
			break;
		}
}


void
print_tagq(struct html *h, const struct tag *until)
{
	struct tag	*tag;

	while ((tag = h->tags.head) != NULL) {
		if (tag == h->metaf)
			h->metaf = 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;
		if (tag == h->metaf)
			h->metaf = NULL;
		print_ctag(h, tag->tag);
		h->tags.head = tag->next;
		free(tag);
	}
}


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);
	bufncat(h, ":", 1);
	bufcat(h, val);
	bufncat(h, ";", 1);
}


void
bufcat(struct html *h, const char *p)
{

	bufncat(h, p, strlen(p));
}


void
buffmt(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);
}


void
bufncat(struct html *h, const char *p, size_t sz)
{

	if (h->buflen + sz > BUFSIZ - 1)
		sz = BUFSIZ - 1 - h->buflen;

	(void)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;
	
	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;
	
	/* LINTED */
	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'):
			buffmt(h, 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;
	const char	*u;

	v = su->scale;

	switch (su->unit) {
	case (SCALE_CM):
		u = "cm";
		break;
	case (SCALE_IN):
		u = "in";
		break;
	case (SCALE_PC):
		u = "pc";
		break;
	case (SCALE_PT):
		u = "pt";
		break;
	case (SCALE_EM):
		u = "em";
		break;
	case (SCALE_MM):
		if (0 == (v /= 100))
			v = 1;
		u = "em";
		break;
	case (SCALE_EN):
		u = "ex";
		break;
	case (SCALE_BU):
		u = "ex";
		break;
	case (SCALE_VS):
		u = "em";
		break;
	default:
		u = "ex";
		break;
	}

	/* 
	 * XXX: the CSS spec isn't clear as to which types accept
	 * integer or real numbers, so we just make them all decimals.
	 */
	buffmt(h, "%s: %.2f%s;", p, v, u);
}


void
html_idcat(char *dst, const char *src, int sz)
{
	int		 ssz;

	assert(sz);

	/* Cf. <http://www.w3.org/TR/html4/types.html#h-6.2>. */

	for ( ; *dst != '\0' && sz; dst++, sz--)
		/* Jump to end. */ ;

	assert(sz > 2);

	/* We can't start with a number (bah). */

	*dst++ = 'x';
	*dst = '\0';
	sz--;

	for ( ; *src != '\0' && sz > 1; src++) {
		ssz = snprintf(dst, (size_t)sz, "%.2x", *src);
		sz -= ssz;
		dst += ssz;
	}
}