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Keep words after .Ic together in a single argument.
[mandoc.git] / html.c
diff --git a/html.c b/html.c
index a62c7fb408a20dcf24362ec584d9b70e9abdf386..30ed53e4dfe93d6e03d770d18898b4cb8ac561bd 100644 (file)
--- a/html.c
+++ b/html.c
@@ -1,850 +1,757 @@
-/* $Id: html.c,v 1.14 2008/12/07 21:30:49 kristaps Exp $ */
+/*     $Id: html.c,v 1.153 2014/01/05 19:10:56 joerg Exp $ */
 /*
 /*
- * Copyright (c) 2008 Kristaps Dzonsons <kristaps@kth.se>
+ * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
+ * Copyright (c) 2011, 2012, 2013 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  *
  * 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.
+ * 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.
+ * 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 <sys/param.h>
-#include <sys/stat.h>
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/types.h>
 
 #include <assert.h>
 
 #include <assert.h>
-#include <err.h>
-#include <fcntl.h>
-#include <stdlib.h>
+#include <ctype.h>
+#include <stdarg.h>
 #include <stdio.h>
 #include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
 #include <string.h>
 #include <unistd.h>
 
-#include "libmdocml.h"
-#include "private.h"
-#include "ml.h"
-
-
-/* TODO: allow head/tail-less invocations (just "div" start). */
+#include "mandoc.h"
+#include "libmandoc.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. */
+};
 
 
-struct htmlnode {
-       int              tok;
-       enum md_ns       ns;
-       int              argc[ROFF_MAXLINEARG];
-       char            *argv[ROFF_MAXLINEARG];
-       struct htmlnode *parent;
+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 */
+       {"p",           HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_P */
+       {"pre",         HTML_CLRLINE }, /* TAG_PRE */
+       {"b",           0 }, /* TAG_B */
+       {"i",           0 }, /* TAG_I */
+       {"code",        0 }, /* TAG_CODE */
+       {"small",       0 }, /* TAG_SMALL */
 };
 
 };
 
+static const char      *const htmlattrs[ATTR_MAX] = {
+       "http-equiv", /* ATTR_HTTPEQUIV */
+       "content", /* ATTR_CONTENT */
+       "name", /* ATTR_NAME */
+       "rel", /* ATTR_REL */
+       "href", /* ATTR_HREF */
+       "type", /* ATTR_TYPE */
+       "media", /* ATTR_MEDIA */
+       "class", /* ATTR_CLASS */
+       "style", /* ATTR_STYLE */
+       "width", /* ATTR_WIDTH */
+       "id", /* ATTR_ID */
+       "summary", /* ATTR_SUMMARY */
+       "align", /* ATTR_ALIGN */
+       "colspan", /* ATTR_COLSPAN */
+};
 
 
-struct htmlq {
-       struct htmlnode *last;
+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_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 *);
+static void     *ml_alloc(char *, enum htmltype);
 
 
-static int             html_loadcss(struct md_mbuf *, const char *);
-
-static int             html_alloc(void **);
-static void            html_free(void *);
-static ssize_t         html_endtag(struct md_mbuf *, void *,
-                               const struct md_args *, 
-                               enum md_ns, int);
-static ssize_t         html_beginstring(struct md_mbuf *, 
-                               const struct md_args *, 
-                               const char *, size_t);
-static ssize_t         html_beginhttp(struct md_mbuf *, 
-                               const struct md_args *, 
-                               const char *, size_t);
-static ssize_t         html_endstring(struct md_mbuf *, 
-                               const struct md_args *, 
-                               const char *, size_t);
-static ssize_t         html_endhttp(struct md_mbuf *, 
-                               const struct md_args *, 
-                               const char *, size_t);
-static ssize_t         html_begintag(struct md_mbuf *, void *,
-                               const struct md_args *, 
-                               enum md_ns, int, 
-                               const int *, const char **);
-static int             html_begin(struct md_mbuf *,
-                               const struct md_args *, 
-                               const struct tm *, 
-                               const char *, const char *, 
-                               const char *, const char *);
-static int             html_printargs(struct md_mbuf *, int, 
-                               const char *, const int *, 
-                               const char **, size_t *);
-static int             html_end(struct md_mbuf *, 
-                               const struct md_args *);
-static int             html_blocktagname(struct md_mbuf *,
-                               const struct md_args *, int, 
-                               struct htmlq *, const int *, 
-                               const char **, size_t *);
-static int             html_blocktagargs(struct md_mbuf *,
-                               const struct md_args *, int,
-                               const int *, const char **, size_t *);
-static int             html_headtagname(struct md_mbuf *,
-                               const struct md_args *, int, 
-                               struct htmlq *, const int *, 
-                               const char **, size_t *);
-static int             html_headtagargs(struct md_mbuf *,
-                               const struct md_args *, int,
-                               const int *, const char **, size_t *);
-static int             html_bodytagname(struct md_mbuf *,
-                               const struct md_args *, 
-                               int, struct htmlq *, const int *, 
-                               const char **, size_t *);
-static int             html_bodytagargs(struct md_mbuf *,
-                               const struct md_args *, int,
-                               const int *, const char **, size_t *);
-static int             html_inlinetagname(struct md_mbuf *,
-                               const struct md_args *, int, size_t *);
-static int             html_inlinetagargs(struct md_mbuf *,
-                               const struct md_args *, int,
-                               const int *, const char **, size_t *);
-static int             html_Bl_bodytagname(struct md_mbuf *, 
-                               struct htmlq *, const int *, 
-                               const char **, size_t *);
-static int             html_It_blocktagname(struct md_mbuf *, 
-                               struct htmlq *, const int *, 
-                               const char **, size_t *);
-static int             html_It_headtagname(struct md_mbuf *, 
-                               struct htmlq *, const int *, 
-                               const char **, size_t *);
-static int             html_It_bodytagname(struct md_mbuf *, 
-                               struct htmlq *, const int *, 
-                               const char **, size_t *);
-
-
-/* ARGSUSED */
-static int
-html_It_headtagname(struct md_mbuf *mbuf, struct htmlq *q, 
-               const int *argc, const char **argv, size_t *res)
+static void *
+ml_alloc(char *outopts, enum htmltype type)
 {
 {
-       struct htmlnode *n;
-       int              i;
-
-       for (n = q->last; n; n = n->parent)
-               if (n->tok == ROFF_Bl)
+       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->type = type;
+       h->tags.head = NULL;
+       h->symtab = mchars_alloc();
+
+       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;
                        break;
-
-       assert(n);
-
-       /* LINTED */
-       for (i = 0; ROFF_ARGMAX != n->argc[i] &&
-                       i < ROFF_MAXLINEARG; i++) {
-               switch (n->argc[i]) {
-               case (ROFF_Ohang):
-                       return(ml_nputs(mbuf, "div", 3, res));
-
-               case (ROFF_Tag):
-                       /* FALLTHROUGH */
-               case (ROFF_Column): 
-                       return(ml_nputs(mbuf, "td", 2, res));
                default:
                        break;
                }
                default:
                        break;
                }
-       }
 
 
-       abort();
-       /* NOTREACHED */
+       return(h);
 }
 
 }
 
-
-/* ARGSUSED */
-static int
-html_It_bodytagname(struct md_mbuf *mbuf, struct htmlq *q, 
-               const int *argc, const char **argv, size_t *res)
+void *
+html_alloc(char *outopts)
 {
 {
-       struct htmlnode *n;
-       int              i;
-
-       for (n = q->last; n; n = n->parent)
-               if (n->tok == ROFF_Bl)
-                       break;
-
-       assert(n);
-
-       /* LINTED */
-       for (i = 0; ROFF_ARGMAX != n->argc[i] &&
-                       i < ROFF_MAXLINEARG; i++) {
-               switch (n->argc[i]) {
-               case (ROFF_Enum):
-                       /* FALLTHROUGH */
-               case (ROFF_Bullet):
-                       /* FALLTHROUGH */
-               case (ROFF_Dash):
-                       /* FALLTHROUGH */
-               case (ROFF_Hyphen):
-                       /* FALLTHROUGH */
-               case (ROFF_Item):
-                       /* FALLTHROUGH */
-               case (ROFF_Diag):
-                       /* FALLTHROUGH */
-               case (ROFF_Hang):
-                       /* FALLTHROUGH */
-               case (ROFF_Ohang): 
-                       /* FALLTHROUGH */
-               case (ROFF_Inset):
-                       return(ml_nputs(mbuf, "div", 3, res));
-               case (ROFF_Tag):
-                       /* FALLTHROUGH */
-               case (ROFF_Column): 
-                       return(ml_nputs(mbuf, "td", 2, res));
-               default:
-                       break;
-               }
-       }
-
-       assert(i != ROFF_MAXLINEARG);
-       abort();
-       /* NOTREACHED */
 
 
-       return(1);
+       return(ml_alloc(outopts, HTML_HTML_4_01_STRICT));
 }
 
 
 }
 
 
-/* ARGSUSED */
-static int
-html_Bl_bodytagname(struct md_mbuf *mbuf, struct htmlq *q, 
-               const int *argc, const char **argv, size_t *res)
+void *
+xhtml_alloc(char *outopts)
 {
 {
-       int              i;
-
-       for (i = 0; ROFF_ARGMAX != argc[i]
-                       && i < ROFF_MAXLINEARG; i++) {
-               switch (argc[i]) {
-               case (ROFF_Enum):
-                       return(ml_nputs(mbuf, "ol", 2, res));
-               case (ROFF_Bullet):
-                       /* FALLTHROUGH */
-               case (ROFF_Dash):
-                       /* FALLTHROUGH */
-               case (ROFF_Hyphen):
-                       /* FALLTHROUGH */
-               case (ROFF_Item):
-                       /* FALLTHROUGH */
-               case (ROFF_Diag):
-                       /* FALLTHROUGH */
-               case (ROFF_Hang):
-                       /* FALLTHROUGH */
-               case (ROFF_Ohang): 
-                       /* FALLTHROUGH */
-               case (ROFF_Inset):
-                       return(ml_nputs(mbuf, "ul", 2, res));
-               case (ROFF_Tag):
-                       /* FALLTHROUGH */
-               case (ROFF_Column): 
-                       return(ml_nputs(mbuf, "table", 5, res));
-               default:
-                       break;
-               }
-       }
 
 
-       assert(i != ROFF_MAXLINEARG);
-       abort();
-       /* NOTREACHED */
+       return(ml_alloc(outopts, HTML_XHTML_1_0_STRICT));
 }
 
 
 }
 
 
-/* ARGSUSED */
-static int
-html_It_blocktagname(struct md_mbuf *mbuf, struct htmlq *q, 
-               const int *argc, const char **argv, size_t *res)
+void
+html_free(void *p)
 {
 {
-       struct htmlnode *n;
-       int              i;
-
-       for (n = q->last; n; n = n->parent)
-               if (n->tok == ROFF_Bl)
-                       break;
+       struct tag      *tag;
+       struct html     *h;
 
 
-       assert(n);
+       h = (struct html *)p;
 
 
-       /* LINTED */
-       for (i = 0; ROFF_ARGMAX != n->argc[i] &&
-                       i < ROFF_MAXLINEARG; i++) {
-               switch (n->argc[i]) {
-               case (ROFF_Enum):
-                       /* FALLTHROUGH */
-               case (ROFF_Bullet):
-                       /* FALLTHROUGH */
-               case (ROFF_Dash):
-                       /* FALLTHROUGH */
-               case (ROFF_Hyphen):
-                       /* FALLTHROUGH */
-               case (ROFF_Item):
-                       /* FALLTHROUGH */
-               case (ROFF_Diag):
-                       /* FALLTHROUGH */
-               case (ROFF_Hang):
-                       /* FALLTHROUGH */
-               case (ROFF_Ohang): 
-                       /* FALLTHROUGH */
-               case (ROFF_Inset):
-                       return(ml_nputs(mbuf, "li", 2, res));
-               case (ROFF_Tag):
-                       /* FALLTHROUGH */
-               case (ROFF_Column): 
-                       return(ml_nputs(mbuf, "tr", 2, res));
-               default:
-                       break;
-               }
+       while ((tag = h->tags.head) != NULL) {
+               h->tags.head = tag->next;       
+               free(tag);
        }
        }
+       
+       if (h->symtab)
+               mchars_free(h->symtab);
 
 
-       assert(i != ROFF_MAXLINEARG);
-       abort();
-       /* NOTREACHED */
+       free(h);
 }
 
 
 }
 
 
-static int
-html_loadcss(struct md_mbuf *mbuf, const char *css)
+void
+print_gen_head(struct html *h)
 {
 {
-       size_t           res, bufsz;
-       char            *buf;
-       struct stat      st;
-       int              fd, c;
-       ssize_t          ssz;
-
-       c = 0;
-       res = 0;
-       buf = NULL;
-
-       if (-1 == (fd = open(css, O_RDONLY, 0))) {
-               warn("%s", css);
-               return(0);
-       } 
-       
-       if (-1 == fstat(fd, &st)) {
-               warn("%s", css);
-               goto out;
+       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);
        }
        }
+}
 
 
-       bufsz = MAX(st.st_blksize, BUFSIZ);
-       if (NULL == (buf = malloc(bufsz))) {
-               warn("malloc");
-               goto out;
-       }
+static void
+print_metaf(struct html *h, enum mandoc_esc deco)
+{
+       enum htmlfont    font;
 
 
-       for (;;) {
-               if (-1 == (ssz = read(fd, buf, bufsz))) {
-                       warn("%s", css);
-                       goto out;
-               } else if (0 == ssz)
-                       break;
-               if ( ! ml_nputs(mbuf, buf, (size_t)ssz, &res))
-                       goto out;
+       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 */
        }
 
        }
 
-       c = 1;
-
-out:
-       if (-1 == close(fd)) {
-               warn("%s", css);
-               c = 0;
+       if (h->metaf) {
+               print_tagq(h, h->metaf);
+               h->metaf = NULL;
        }
 
        }
 
-       if (buf)
-               free(buf);
+       h->metal = h->metac;
+       h->metac = font;
 
 
-       return(c);
+       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;
+       }
 }
 
 }
 
-
-/* ARGSUSED */
-static int 
-html_begin(struct md_mbuf *mbuf, const struct md_args *args,
-               const struct tm *tm, const char *os, 
-               const char *title, const char *section, 
-               const char *vol)
+int
+html_strlen(const char *cp)
 {
 {
-       const char      *preamble, *css, *trail;
-       char             buf[512];
-       size_t           res;
-
-       preamble =
-       "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\"\n"
-       "    \"http://www.w3.org/TR/html4/strict.dtd\">\n"
-       "<html>\n"
-       "<head>\n"
-       "    <meta http-equiv=\"Content-Type\"\n"
-       "         content=\"text/html;charset=utf-8\">\n"
-       "    <meta name=\"resource-type\" content=\"document\">\n"
-       "    <title>Manual Page for %s(%s)</title>\n";
-
-       css = 
-       "    <link rel=\"stylesheet\" type=\"text/css\"\n"
-       "         href=\"%s\">\n";
-       trail = 
-       "</head>\n"
-       "<body>\n"
-       "<div class=\"mdoc\">";
-
-       res = 0;
-
-       (void)snprintf(buf, sizeof(buf) - 1,
-                       preamble, title, section);
-
-       if ( ! ml_puts(mbuf, buf, &res))
-               return(0);
-
-       assert(args->params.html.css);
-       if (HTML_CSS_EMBED & args->params.html.flags) {
-               if ( ! ml_puts(mbuf, "    <style type=\"text/css\"><!--\n", &res))
-                       return(0);
-               if ( ! html_loadcss(mbuf, args->params.html.css))
-                       return(0);
-               if ( ! ml_puts(mbuf, "    --!></style>\n", &res))
-                       return(0);
-       } else {
-               (void)snprintf(buf, sizeof(buf) - 1, css, 
-                               args->params.html.css);
-               if ( ! ml_puts(mbuf, buf, &res))
-                       return(0);
+       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;
+               }
        }
        }
-
-       if ( ! ml_puts(mbuf, trail, &res))
-               return(0);
-
-       return(1);
+       return(sz);
 }
 
 }
 
-
-/* ARGSUSED */
-static int 
-html_end(struct md_mbuf *mbuf, const struct md_args *args)
+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[6] = { '\\', '<', '>', '&', ASCII_HYPH, '\0' };
+
+       nospace = 0;
+
+       while ('\0' != *p) {
+               if (HTML_SKIPCHAR & h->flags && '\\' != *p) {
+                       h->flags &= ~HTML_SKIPCHAR;
+                       p++;
+                       continue;
+               }
 
 
-       return(ml_puts(mbuf, "</div></body>\n</html>", NULL));
-}
+               sz = strcspn(p, rejs);
 
 
+               fwrite(p, 1, sz, stdout);
+               p += (int)sz;
 
 
-/* ARGSUSED */
-static int
-html_bodytagname(struct md_mbuf *mbuf, 
-               const struct md_args *args, int tok, struct htmlq *q, 
-               const int *argc, const char **argv, size_t *res)
-{
+               if ('\0' == *p)
+                       break;
 
 
-       switch (tok) {
-       case (ROFF_Bl):
-               return(html_Bl_bodytagname(mbuf, q, argc, argv, res));
-       case (ROFF_Fo):
-               return(ml_nputs(mbuf, "span", 4, res));
-       case (ROFF_It):
-               return(html_It_bodytagname(mbuf, q, argc, argv, res));
-       case (ROFF_Oo):
-               return(ml_nputs(mbuf, "span", 4, res));
-       default:
-               break;
-       }
+               switch (*p++) {
+               case ('<'):
+                       printf("&lt;");
+                       continue;
+               case ('>'):
+                       printf("&gt;");
+                       continue;
+               case ('&'):
+                       printf("&amp;");
+                       continue;
+               case (ASCII_HYPH):
+                       putchar('-');
+                       continue;
+               default:
+                       break;
+               }
 
 
-       return(ml_puts(mbuf, "div", res));
-}
+               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;
+               }
 
 
-/* ARGSUSED */
-static int
-html_headtagname(struct md_mbuf *mbuf, 
-               const struct md_args *args, int tok, struct htmlq *q, 
-               const int *argc, const char **argv, size_t *res)
-{
+               if (h->flags & HTML_SKIPCHAR) {
+                       h->flags &= ~HTML_SKIPCHAR;
+                       continue;
+               }
 
 
-       switch (tok) {
-       case (ROFF_It):
-               return(html_It_headtagname(mbuf, q, argc, argv, res));
-       case (ROFF_Fo):
-               return(ml_nputs(mbuf, "span", 4, res));
-       case (ROFF_Oo):
-               return(ml_nputs(mbuf, "span", 4, res));
-       case (ROFF_Sh):
-               return(ml_nputs(mbuf, "h1", 2, res));
-       case (ROFF_Ss):
-               return(ml_nputs(mbuf, "h2", 2, res));
-       default:
-               break;
+               switch (esc) {
+               case (ESCAPE_UNICODE):
+                       /* Skip passed "u" header. */
+                       c = mchars_num2uc(seq + 1, len - 1);
+                       if ('\0' != c)
+                               printf("&#x%x;", c);
+                       break;
+               case (ESCAPE_NUMBERED):
+                       c = mchars_num2char(seq, len);
+                       if ('\0' != c)
+                               putchar(c);
+                       break;
+               case (ESCAPE_SPECIAL):
+                       c = mchars_spec2cp(h->symtab, seq, len);
+                       if (c > 0)
+                               printf("&#%d;", c);
+                       else if (-1 == c && 1 == len)
+                               putchar((int)*seq);
+                       break;
+               case (ESCAPE_NOSPACE):
+                       if ('\0' == *p)
+                               nospace = 1;
+                       break;
+               default:
+                       break;
+               }
        }
 
        }
 
-       return(ml_nputs(mbuf, "div", 3, res));
+       return(nospace);
 }
 
 
 }
 
 
-/* ARGSUSED */
-static int
-html_blocktagname(struct md_mbuf *mbuf, const struct md_args *args, 
-               int tok, struct htmlq *q, const int *argc, 
-               const char **argv, size_t *res)
+static void
+print_attr(struct html *h, const char *key, const char *val)
 {
 {
-
-       switch (tok) {
-       case (ROFF_Fo):
-               return(ml_nputs(mbuf, "span", 4, res));
-       case (ROFF_Oo):
-               return(ml_nputs(mbuf, "span", 4, res));
-       case (ROFF_It):
-               return(html_It_blocktagname(mbuf, q, argc, argv, res));
-       default:
-               break;
-       }
-
-       return(ml_puts(mbuf, "div", res));
+       printf(" %s=\"", key);
+       (void)print_encode(h, val, 1);
+       putchar('\"');
 }
 
 
 }
 
 
-/* ARGSUSED */
-static int
-html_printargs(struct md_mbuf *mbuf, int tok, const char *ns,
-               const int *argc, const char **argv, size_t *res)
+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 ( ! ml_puts(mbuf, " class=\"", res))
-               return(0);
-       if ( ! ml_puts(mbuf, ns, res))
-               return(0);
-       if ( ! ml_puts(mbuf, "-", res))
-               return(0);
-       if ( ! ml_puts(mbuf, toknames[tok], res))
-               return(0);
-       return(ml_puts(mbuf, "\"", res));
-}
+       if ( ! (h->flags & HTML_NONOSPACE))
+               h->flags &= ~HTML_NOSPACE;
+       else
+               h->flags |= HTML_NOSPACE;
 
 
+       /* Print out the tag name and attributes. */
 
 
-/* ARGSUSED */
-static int
-html_headtagargs(struct md_mbuf *mbuf, 
-               const struct md_args *args, int tok, 
-               const int *argc, const char **argv, size_t *res)
-{
+       printf("<%s", htmltags[tag].name);
+       for (i = 0; i < sz; i++)
+               print_attr(h, htmlattrs[p[i].key], p[i].val);
 
 
-       return(html_printargs(mbuf, tok, "head", argc, argv, res));
-}
+       /* 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");
+       }
 
 
-/* ARGSUSED */
-static int
-html_bodytagargs(struct md_mbuf *mbuf, 
-               const struct md_args *args, int tok, 
-               const int *argc, const char **argv, size_t *res)
-{
+       /* Accommodate for XML "well-formed" singleton escaping. */
 
 
-       return(html_printargs(mbuf, tok, "body", argc, argv, res));
-}
+       if (HTML_AUTOCLOSE & htmltags[tag].flags)
+               switch (h->type) {
+               case (HTML_XHTML_1_0_STRICT):
+                       putchar('/');
+                       break;
+               default:
+                       break;
+               }
 
 
+       putchar('>');
 
 
-/* ARGSUSED */
-static int
-html_blocktagargs(struct md_mbuf *mbuf, 
-               const struct md_args *args, int tok, 
-               const int *argc, const char **argv, size_t *res)
-{
+       h->flags |= HTML_NOSPACE;
 
 
-       return(html_printargs(mbuf, tok, "block", argc, argv, res));
+       if ((HTML_AUTOCLOSE | HTML_CLRLINE) & htmltags[tag].flags)
+               putchar('\n');
+
+       return(t);
 }
 
 
 }
 
 
-/* ARGSUSED */
-static int
-html_inlinetagargs(struct md_mbuf *mbuf, 
-               const struct md_args *args, int tok, 
-               const int *argc, const char **argv, size_t *res)
+static void
+print_ctag(struct html *h, enum htmltag tag)
 {
 {
-
-       if ( ! html_printargs(mbuf, tok, "inline", argc, argv, res))
-               return(0);
-
-       switch (tok) {
-       case (ROFF_Sx):
-               assert(*argv);
-               if ( ! ml_nputs(mbuf, " href=\"#", 8, res))
-                       return(0);
-               if ( ! ml_putstring(mbuf, *argv, res))
-                       return(0);
-               if ( ! ml_nputs(mbuf, "\"", 1, res))
-                       return(0);
-               break;
-       default:
-               break;
-       }
        
        
-       return(1);
+       printf("</%s>", htmltags[tag].name);
+       if (HTML_CLRLINE & htmltags[tag].flags) {
+               h->flags |= HTML_NOSPACE;
+               putchar('\n');
+       } 
 }
 
 }
 
-
-/* ARGSUSED */
-static int
-html_inlinetagname(struct md_mbuf *mbuf, 
-               const struct md_args *args, int tok, size_t *res)
+void
+print_gen_decls(struct html *h)
 {
 {
-
-       switch (tok) {
-       case (ROFF_Pp):
-               return(ml_nputs(mbuf, "div", 3, res));
-       case (ROFF_Sx):
-               return(ml_nputs(mbuf, "a", 1, res));
+       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:
        default:
+               puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
+               name = "html";
+               doctype = "-//W3C//DTD XHTML 1.0 Strict//EN";
+               dtd = "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";
                break;
        }
 
                break;
        }
 
-       return(ml_puts(mbuf, "span", res));
+       printf("<!DOCTYPE %s PUBLIC \"%s\" \"%s\">\n", 
+                       name, doctype, dtd);
 }
 
 }
 
-
-static ssize_t 
-html_begintag(struct md_mbuf *mbuf, void *data,
-               const struct md_args *args, enum md_ns ns, 
-               int tok, const int *argc, const char **argv)
+void
+print_text(struct html *h, const char *word)
 {
 {
-       size_t           res;
-       struct htmlq    *q;
-       struct htmlnode *node;
-       int              i;
-
-       assert(ns != MD_NS_DEFAULT);
-       res = 0;
-
-       assert(data);
-       q = (struct htmlq *)data;
 
 
-       if (NULL == (node = calloc(1, sizeof(struct htmlnode)))) {
-               warn("calloc");
-               return(-1);
+       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;");
        }
 
        }
 
-       node->parent = q->last;
-       node->tok = tok;
-       node->ns = ns;
-
-       if (argc)  {
-               /* TODO: argv. */
-
-               assert(argv);
-               /* LINTED */
-               for (i = 0; ROFF_ARGMAX != argc[i]
-                               && i < ROFF_MAXLINEARG; i++) 
-                       node->argc[i] = argc[i];
-               assert(i != ROFF_MAXLINEARG);
-       } 
-
-
-       q->last = node;
-
-       switch (ns) {
-       case (MD_NS_BLOCK):
-               if ( ! html_blocktagname(mbuf, args, tok, 
-                                       q, argc, argv, &res))
-                       return(-1);
-               if ( ! html_blocktagargs(mbuf, args, tok, 
-                                       argc, argv, &res))
-                       return(-1);
+       assert(NULL == h->metaf);
+       switch (h->metac) {
+       case (HTMLFONT_ITALIC):
+               h->metaf = print_otag(h, TAG_I, 0, NULL);
                break;
                break;
-       case (MD_NS_BODY):
-               if ( ! html_bodytagname(mbuf, args, tok, 
-                                       q, argc, argv, &res))
-                       return(-1);
-               if ( ! html_bodytagargs(mbuf, args, tok, 
-                                       argc, argv, &res))
-                       return(-1);
+       case (HTMLFONT_BOLD):
+               h->metaf = print_otag(h, TAG_B, 0, NULL);
                break;
                break;
-       case (MD_NS_HEAD):
-               if ( ! html_headtagname(mbuf, args, tok, q,
-                                       argc, argv, &res))
-                       return(-1);
-               if ( ! html_headtagargs(mbuf, args, tok, 
-                                       argc, argv, &res))
-                       return(-1);
+       case (HTMLFONT_BI):
+               h->metaf = print_otag(h, TAG_B, 0, NULL);
+               print_otag(h, TAG_I, 0, NULL);
                break;
        default:
                break;
        default:
-               if ( ! html_inlinetagname(mbuf, args, tok, &res))
-                       return(-1);
-               if ( ! html_inlinetagargs(mbuf, args, tok, 
-                                       argc, argv, &res))
-                       return(-1);
                break;
        }
 
                break;
        }
 
-       return((ssize_t)res);
-}
-
+       assert(word);
+       if ( ! print_encode(h, word, 0)) {
+               if ( ! (h->flags & HTML_NONOSPACE))
+                       h->flags &= ~HTML_NOSPACE;
+       } else
+               h->flags |= HTML_NOSPACE;
 
 
-static ssize_t 
-html_endtag(struct md_mbuf *mbuf, void *data,
-               const struct md_args *args, enum md_ns ns, int tok)
-{
-       size_t           res;
-       struct htmlq    *q;
-       struct htmlnode *node;
-
-       assert(ns != MD_NS_DEFAULT);
-       res = 0;
-
-       assert(data);
-       q = (struct htmlq *)data;
-       node = q->last;
-
-       switch (ns) {
-       case (MD_NS_BLOCK):
-               if ( ! html_blocktagname(mbuf, args, tok, 
-                                       q, node->argc, 
-                                       (const char **)node->argv, &res))
-                       return(-1);
-               break;
-       case (MD_NS_BODY):
-               if ( ! html_bodytagname(mbuf, args, tok, 
-                                       q, node->argc, 
-                                       (const char **)node->argv, &res))
-                       return(-1);
-               break;
-       case (MD_NS_HEAD):
-               if ( ! html_headtagname(mbuf, args, tok, 
-                                       q, node->argc,
-                                       (const char **)node->argv, &res))
-                       return(-1);
-               break;
-       default:
-               if ( ! html_inlinetagname(mbuf, args, tok, &res))
-                       return(-1);
-               break;
+       if (h->metaf) {
+               print_tagq(h, h->metaf);
+               h->metaf = NULL;
        }
 
        }
 
-       q->last = node->parent;
-
-       free(node);
-
-       return((ssize_t)res);
+       h->flags &= ~HTML_IGNDELIM;
 }
 
 
 }
 
 
-static int
-html_alloc(void **p)
+void
+print_tagq(struct html *h, const struct tag *until)
 {
 {
-
-       if (NULL == (*p = calloc(1, sizeof(struct htmlq)))) {
-               warn("calloc");
-               return(0);
+       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;
        }
        }
-       return(1);
 }
 
 
 }
 
 
-static void
-html_free(void *p)
+void
+print_stagq(struct html *h, const struct tag *suntil)
 {
 {
-       struct htmlq    *q;
-       struct htmlnode *n;
-
-       assert(p);
-       q = (struct htmlq *)p;
-
-       /* LINTED */
-       while ((n = q->last)) {
-               q->last = n->parent;
-               free(n);
+       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);
        }
        }
-
-       free(q);
 }
 
 }
 
-
-static ssize_t 
-html_beginhttp(struct md_mbuf *mbuf, 
-               const struct md_args *args, 
-               const char *buf, size_t sz)
+void
+bufinit(struct html *h)
 {
 {
-       size_t           res;
 
 
-       res = 0;
+       h->buf[0] = '\0';
+       h->buflen = 0;
+}
 
 
-       if ( ! ml_puts(mbuf, "<a href=\"", &res))
-               return(-1);
-       if (1 != ml_nputstring(mbuf, buf, sz, &res))
-               return(-1);
-       if ( ! ml_puts(mbuf, "\">", &res))
-               return(-1);
+void
+bufcat_style(struct html *h, const char *key, const char *val)
+{
 
 
-       return((ssize_t)res);
+       bufcat(h, key);
+       bufcat(h, ":");
+       bufcat(h, val);
+       bufcat(h, ";");
 }
 
 }
 
-
-static ssize_t 
-html_endhttp(struct md_mbuf *mbuf, 
-               const struct md_args *args, 
-               const char *buf, size_t sz)
+void
+bufcat(struct html *h, const char *p)
 {
 {
-       size_t           res;
 
 
-       res = 0;
+       h->buflen = strlcat(h->buf, p, BUFSIZ);
+       assert(h->buflen < BUFSIZ);
+}
 
 
-       if ( ! ml_puts(mbuf, "</a>", &res))
-               return(-1);
+void
+bufcat_fmt(struct html *h, const char *fmt, ...)
+{
+       va_list          ap;
 
 
-       return((ssize_t)res);
+       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);
 }
 
 }
 
-
-/* ARGSUSED */
-static ssize_t 
-html_beginstring(struct md_mbuf *mbuf, 
-               const struct md_args *args, 
-               const char *buf, size_t sz)
+static void
+bufncat(struct html *h, const char *p, size_t sz)
 {
 
 {
 
-       if (0 == strncmp(buf, "http://", 7))
-               return(html_beginhttp(mbuf, args, buf, sz));
-
-       return(0);
+       assert(h->buflen + sz + 1 < BUFSIZ);
+       strncat(h->buf, p, sz);
+       h->buflen += sz;
 }
 
 }
 
-
-/* ARGSUSED */
-static ssize_t 
-html_endstring(struct md_mbuf *mbuf, 
-               const struct md_args *args, 
-               const char *buf, size_t sz)
+void
+buffmt_includes(struct html *h, const char *name)
 {
 {
-       
-       if (0 == strncmp(buf, "http://", 7))
-               return(html_endhttp(mbuf, args, buf, sz));
+       const char      *p, *pp;
 
 
-       return(0);
+       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);
 }
 
 }
 
-
-int
-md_line_html(void *data, char *buf)
+void
+buffmt_man(struct html *h, 
+               const char *name, const char *sec)
 {
 {
+       const char      *p, *pp;
 
 
-       return(mlg_line((struct md_mlg *)data, buf));
+       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);
 }
 
 }
 
-
-int
-md_exit_html(void *data, int flush)
+void
+bufcat_su(struct html *h, const char *p, const struct roffsu *su)
 {
 {
+       double           v;
 
 
-       return(mlg_exit((struct md_mlg *)data, flush));
-}
+       v = su->scale;
+       if (SCALE_MM == su->unit && 0.0 == (v /= 100.0))
+               v = 1.0;
 
 
+       bufcat_fmt(h, "%s: %.2f%s;", p, v, roffscales[su->unit]);
+}
 
 
-void *
-md_init_html(const struct md_args *args,
-               struct md_mbuf *mbuf, const struct md_rbuf *rbuf)
+void
+bufcat_id(struct html *h, const char *src)
 {
 {
-       struct ml_cbs    cbs;
-
-       cbs.ml_alloc = html_alloc;
-       cbs.ml_free = html_free;
-       cbs.ml_begintag = html_begintag;
-       cbs.ml_endtag = html_endtag;
-       cbs.ml_begin = html_begin;
-       cbs.ml_end = html_end;
-       cbs.ml_beginstring = html_beginstring;
-       cbs.ml_endstring = html_endstring;
-
-       return(mlg_alloc(args, rbuf, mbuf, &cbs));
+
+       /* Cf. <http://www.w3.org/TR/html4/types.html#h-6.2>. */
+
+       while ('\0' != *src)
+               bufcat_fmt(h, "%.2x", *src++);
 }
 }
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