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File: [cvsweb.bsd.lv] / mandoc / html.c (download)

Revision 1.185, Wed Jan 21 20:33:25 2015 UTC (5 years, 10 months ago) by schwarze
Branch: MAIN
CVS Tags: VERSION_1_13_3
Changes since 1.184: +9 -2 lines

Rudimentary implementation of the roff(7) \o escape sequence (overstrike).
This is of some relevance because the pod2man(1) preamble abuses it
for the icelandic letter Thorn, instead of simply using \(TP and \(Tp.
Missing feature found by sthen@ in DateTime::Locale::is_IS(3p).

/*	$Id: html.c,v 1.185 2015/01/21 20:33:25 schwarze Exp $ */
/*
 * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2011-2015 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 *, struct tag *);
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:
			/* FALLTHROUGH */
		case ESCAPE_OVERSTRIKE:
			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;
		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)
			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, struct tag *tag)
{

	/*
	 * 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;

	printf("</%s>", htmltags[tag->tag].name);
	if (HTML_CLRLINE & htmltags[tag->tag].flags) {
		h->flags |= HTML_NOSPACE;
		putchar('\n');
	}

	h->tags.head = tag->next;
	free(tag);
}

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) {
		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->tags.head) != NULL) {
		if (suntil && tag == suntil)
			return;
		print_ctag(h, 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++);
}