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html.c
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html.c
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/*
* Copyright (c) 2008, Natacha Porté
* Copyright (c) 2011, Vicent Martí
* Copyright (c) 2014, Xavier Mendez, Devin Torres and the Hoedown authors
* Copyright (c) Kristaps Dzonsons <[email protected]>
*
* 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"
#if HAVE_SYS_QUEUE
# include <sys/queue.h>
#endif
#include <assert.h>
#include <ctype.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "lowdown.h"
#include "extern.h"
/*
* Our internal state object.
*/
struct html {
struct hentryq headers_used; /* headers we've seen */
ssize_t headers_offs; /* header offset */
unsigned int flags; /* "oflags" in lowdown_opts */
struct lowdown_buf **foots; /* footnotes */
size_t footsz; /* footnotes size */
};
/*
* Escape regular text that shouldn't be HTML.
* Return zero on failure, non-zero on success.
*/
static int
escape_html(struct lowdown_buf *ob, const char *source,
size_t length, const struct html *st)
{
return hesc_html(ob, source, length,
st->flags & LOWDOWN_HTML_OWASP, 0,
st->flags & LOWDOWN_HTML_NUM_ENT);
}
/*
* See escape_html().
*/
static int
escape_htmlb(struct lowdown_buf *ob,
const struct lowdown_buf *in, const struct html *st)
{
return escape_html(ob, in->data, in->size, st);
}
/*
* Escape literal text.
* Like escape_html() except more restrictive.
* Return zero on failure, non-zero on success.
*/
static int
escape_literal(struct lowdown_buf *ob,
const struct lowdown_buf *in, const struct html *st)
{
return hesc_html(ob, in->data, in->size,
st->flags & LOWDOWN_HTML_OWASP, 1,
st->flags & LOWDOWN_HTML_NUM_ENT);
}
/*
* Escape an href link.
* Return zero on failure, non-zero on success.
*/
static int
escape_href(struct lowdown_buf *ob, const struct lowdown_buf *in,
const struct html *st)
{
return hesc_href(ob, in->data, in->size);
}
/*
* Escape an HTML attribute.
* Return zero on failure, non-zero on success.
*/
static int
escape_attr(struct lowdown_buf *ob, const struct lowdown_buf *in)
{
return hesc_attr(ob, in->data, in->size);
}
static int
newline(struct lowdown_buf *ob)
{
if (ob->size > 0 && ob->data[ob->size - 1] != '\n' &&
!hbuf_putc(ob, '\n'))
return 0;
return 1;
}
static int
rndr_autolink(struct lowdown_buf *ob,
const struct rndr_autolink *parm,
const struct html *st)
{
if (parm->link.size == 0)
return 1;
if (!HBUF_PUTSL(ob, "<a href=\""))
return 0;
if (parm->type == HALINK_EMAIL && !HBUF_PUTSL(ob, "mailto:"))
return 0;
if (!escape_href(ob, &parm->link, st))
return 0;
if (!HBUF_PUTSL(ob, "\">"))
return 0;
/*
* Pretty printing: if we get an email address as
* an actual URI, e.g. `mailto:[email protected]`, we don't
* want to print the `mailto:` prefix
*/
if (hbuf_strprefix(&parm->link, "mailto:")) {
if (!escape_html(ob,
parm->link.data + 7,
parm->link.size - 7, st))
return 0;
} else {
if (!escape_htmlb(ob, &parm->link, st))
return 0;
}
return HBUF_PUTSL(ob, "</a>");
}
static int
rndr_blockcode(struct lowdown_buf *ob,
const struct rndr_blockcode *parm,
const struct html *st)
{
if (!newline(ob))
return 0;
if (parm->lang.size) {
if (!HBUF_PUTSL(ob, "<pre><code class=\"language-"))
return 0;
if (!escape_href(ob, &parm->lang, st))
return 0;
if (!HBUF_PUTSL(ob, "\">"))
return 0;
} else {
if (! HBUF_PUTSL(ob, "<pre><code>"))
return 0;
}
if (!escape_literal(ob, &parm->text, st))
return 0;
return HBUF_PUTSL(ob, "</code></pre>\n");
}
static int
rndr_definition_data(struct lowdown_buf *ob,
const struct lowdown_buf *content)
{
if (!HBUF_PUTSL(ob, "<dd>\n"))
return 0;
if (!hbuf_putb(ob, content))
return 0;
return HBUF_PUTSL(ob, "\n</dd>\n");
}
static int
rndr_definition_title(struct lowdown_buf *ob,
const struct lowdown_buf *content)
{
size_t sz;
if (!HBUF_PUTSL(ob, "<dt>"))
return 0;
if ((sz = content->size) > 0) {
while (sz && content->data[sz - 1] == '\n')
sz--;
if (!hbuf_put(ob, content->data, sz))
return 0;
}
return HBUF_PUTSL(ob, "</dt>\n");
}
static int
rndr_definition(struct lowdown_buf *ob,
const struct lowdown_buf *content)
{
if (!newline(ob))
return 0;
if (!HBUF_PUTSL(ob, "<dl>\n"))
return 0;
if (!hbuf_putb(ob, content))
return 0;
return HBUF_PUTSL(ob, "</dl>\n");
}
static int
rndr_blockquote(const struct html *st,
const struct rndr_blockquote *param,
struct lowdown_buf *ob, const struct lowdown_buf *content)
{
size_t i;
if (!newline(ob))
return 0;
if (param->type == BLOCKQUOTE_REGULAR || !(st->flags &
(LOWDOWN_HTML_CALLOUT_GFM|LOWDOWN_HTML_CALLOUT_MDN)))
return HBUF_PUTSL(ob, "<blockquote>\n") &&
hbuf_putb(ob, content) &&
HBUF_PUTSL(ob, "</blockquote>\n");
if (!HBUF_PUTSL(ob, "<div class=\""))
return 0;
/* MDN/GFM style blockquotes. */
if (st->flags & LOWDOWN_HTML_CALLOUT_MDN) {
if (!hbuf_printf(ob, "%s",
(param->admonition == ADMONITION_NOTE) ?
"notecard note" :
(param->admonition == ADMONITION_WARNING) ?
"notecard warning" : "callout"))
return 0;
}
if (st->flags & LOWDOWN_HTML_CALLOUT_GFM) {
if (!hbuf_printf(ob, "%smarkdown-alert ",
(st->flags & LOWDOWN_HTML_CALLOUT_MDN) ? " " : ""))
return 0;
if (!hbuf_printf(ob, "markdown-alert-%s",
(param->admonition == ADMONITION_NOTE) ?
"note" :
(param->admonition == ADMONITION_WARNING) ?
"warning" : "callout"))
return 0;
}
if (!HBUF_PUTSL(ob, "\">\n"))
return 0;
/*
* Weird: content callouts have their initial callout type
* removed. Fortunately, this is hard-coded, so we know its
* exact length. Remove the callout type and any extra spacing
* that follows it.
*/
if (param->admonition == ADMONITION_CALLOUT && content->size > 28) {
i = 28;
while (i < content->size && content->data[i] == ' ')
i++;
if (!HBUF_PUTSL(ob, "<p>") ||
!hbuf_put(ob, content->data + i, content->size - i))
return 0;
} else if (!hbuf_putb(ob, content))
return 0;
return HBUF_PUTSL(ob, "</div>\n");
}
static int
rndr_codespan(struct lowdown_buf *ob,
const struct rndr_codespan *param,
const struct html *st)
{
if (!HBUF_PUTSL(ob, "<code>"))
return 0;
if (!escape_htmlb(ob, ¶m->text, st))
return 0;
return HBUF_PUTSL(ob, "</code>");
}
static int
rndr_strikethrough(struct lowdown_buf *ob,
const struct lowdown_buf *content)
{
if (!HBUF_PUTSL(ob, "<del>"))
return 0;
if (!hbuf_putb(ob, content))
return 0;
return HBUF_PUTSL(ob, "</del>");
}
static int
rndr_double_emphasis(struct lowdown_buf *ob,
const struct lowdown_buf *content)
{
if (!HBUF_PUTSL(ob, "<strong>"))
return 0;
if (!hbuf_putb(ob, content))
return 0;
return HBUF_PUTSL(ob, "</strong>");
}
static int
rndr_emphasis(struct lowdown_buf *ob,
const struct lowdown_buf *content)
{
if (!HBUF_PUTSL(ob, "<em>"))
return 0;
if (!hbuf_putb(ob, content))
return 0;
return HBUF_PUTSL(ob, "</em>");
}
static int
rndr_highlight(struct lowdown_buf *ob,
const struct lowdown_buf *content)
{
if (!HBUF_PUTSL(ob, "<mark>"))
return 0;
if (!hbuf_putb(ob, content))
return 0;
return HBUF_PUTSL(ob, "</mark>");
}
static int
rndr_linebreak(struct lowdown_buf *ob)
{
return HBUF_PUTSL(ob, "<br/>\n");
}
static int
rndr_header(struct lowdown_buf *ob, const struct lowdown_buf *content,
const struct lowdown_node *n, struct html *st)
{
ssize_t level;
const struct lowdown_buf *buf;
/*
* The <hN> level take into account shifteheadinglevelby
* metadata, so offset it here. Bound us below <h6>.
*/
level = (ssize_t)n->rndr_header.level + st->headers_offs;
if (level < 1)
level = 1;
else if (level > 6)
level = 6;
if (!newline(ob))
return 0;
if (!hbuf_printf(ob, "<h%zu", level))
return 0;
/*
* Identifiers can either come from header attributes or as
* computed from the content of the header.
*/
if (n->rndr_header.attr_id.size) {
if (!HBUF_PUTSL(ob, " id=\""))
return 0;
if (!escape_href(ob, &n->rndr_header.attr_id, st))
return 0;
if (!HBUF_PUTSL(ob, "\""))
return 0;
} else if (st->flags & LOWDOWN_HTML_HEAD_IDS) {
if (!HBUF_PUTSL(ob, " id=\""))
return 0;
buf = hbuf_id(NULL, n, &st->headers_used);
if (buf == NULL)
return 0;
if (!hbuf_putb(ob, buf))
return 0;
if (!HBUF_PUTSL(ob, "\""))
return 0;
}
/* Optional header class. */
if (n->rndr_header.attr_cls.size) {
if (!HBUF_PUTSL(ob, " class=\""))
return 0;
if (!escape_attr(ob, &n->rndr_header.attr_cls))
return 0;
if (!HBUF_PUTSL(ob, "\""))
return 0;
}
if (!HBUF_PUTSL(ob, ">"))
return 0;
if (!hbuf_putb(ob, content))
return 0;
return hbuf_printf(ob, "</h%zu>\n", level);
}
static int
rndr_link(struct lowdown_buf *ob,
const struct lowdown_buf *content,
const struct rndr_link *param,
const struct html *st)
{
if (!HBUF_PUTSL(ob, "<a href=\"") ||
!escape_href(ob, ¶m->link, st))
return 0;
if (param->title.size)
if (!HBUF_PUTSL(ob, "\" title=\"") ||
!escape_attr(ob, ¶m->title))
return 0;
if (param->attr_cls.size)
if (!HBUF_PUTSL(ob, "\" class=\"") ||
!escape_attr(ob, ¶m->attr_cls))
return 0;
if (param->attr_id.size)
if (!HBUF_PUTSL(ob, "\" id=\"") ||
!escape_attr(ob, ¶m->attr_id))
return 0;
if (!HBUF_PUTSL(ob, "\">") ||
!hbuf_putb(ob, content) ||
!HBUF_PUTSL(ob, "</a>"))
return 0;
return 1;
}
static int
rndr_list(struct lowdown_buf *ob,
const struct lowdown_buf *content,
const struct rndr_list *param)
{
if (!newline(ob))
return 0;
if (param->flags & HLIST_FL_ORDERED) {
if (param->start > 1) {
if (!hbuf_printf(ob,
"<ol start=\"%zu\">\n", param->start))
return 0;
} else {
if (!HBUF_PUTSL(ob, "<ol>\n"))
return 0;
}
} else if (!HBUF_PUTSL(ob, "<ul>\n"))
return 0;
if (!hbuf_putb(ob, content))
return 0;
return (param->flags & HLIST_FL_ORDERED) ?
HBUF_PUTSL(ob, "</ol>\n") :
HBUF_PUTSL(ob, "</ul>\n");
}
static int
rndr_listitem(struct lowdown_buf *ob,
const struct lowdown_buf *content,
const struct lowdown_node *n)
{
size_t size;
int blk = 0;
/*
* If we're in block mode (which can be assigned post factum in
* the parser), make sure that we have an extra <p> around
* non-block content.
*/
if (((n->rndr_listitem.flags & HLIST_FL_DEF) &&
n->parent != NULL &&
n->parent->parent != NULL &&
n->parent->parent->type == LOWDOWN_DEFINITION &&
(n->parent->parent->rndr_definition.flags &
HLIST_FL_BLOCK)) ||
(!(n->rndr_listitem.flags & HLIST_FL_DEF) &&
n->parent != NULL &&
n->parent->type == LOWDOWN_LIST &&
(n->parent->rndr_list.flags & HLIST_FL_BLOCK))) {
if (!(hbuf_strprefix(content, "<ul") ||
hbuf_strprefix(content, "<ol") ||
hbuf_strprefix(content, "<dl") ||
hbuf_strprefix(content, "<div") ||
hbuf_strprefix(content, "<table") ||
hbuf_strprefix(content, "<blockquote") ||
hbuf_strprefix(content, "<pre>") ||
hbuf_strprefix(content, "<h") ||
hbuf_strprefix(content, "<p>")))
blk = 1;
}
/* Only emit <li> if we're not a <dl> list. */
if (!(n->rndr_listitem.flags & HLIST_FL_DEF) &&
!HBUF_PUTSL(ob, "<li>"))
return 0;
if (blk && !HBUF_PUTSL(ob, "<p>"))
return 0;
if (n->rndr_listitem.flags &
(HLIST_FL_CHECKED|HLIST_FL_UNCHECKED))
HBUF_PUTSL(ob, "<input type=\"checkbox\" ");
if (n->rndr_listitem.flags & HLIST_FL_CHECKED)
HBUF_PUTSL(ob, "checked=\"checked\" ");
if (n->rndr_listitem.flags &
(HLIST_FL_CHECKED|HLIST_FL_UNCHECKED))
HBUF_PUTSL(ob, "/>");
/* Cut off any trailing space. */
if ((size = content->size) > 0) {
while (size && content->data[size - 1] == '\n')
size--;
if (!hbuf_put(ob, content->data, size))
return 0;
}
if (blk && !HBUF_PUTSL(ob, "</p>"))
return 0;
if (!(n->rndr_listitem.flags & HLIST_FL_DEF) &&
!HBUF_PUTSL(ob, "</li>\n"))
return 0;
return 1;
}
static int
rndr_paragraph(struct lowdown_buf *ob,
const struct lowdown_buf *content,
struct html *st)
{
size_t i = 0, org;
if (content->size == 0)
return 1;
while (i < content->size &&
isspace((unsigned char)content->data[i]))
i++;
if (i == content->size)
return 1;
if (!newline(ob))
return 0;
if (!HBUF_PUTSL(ob, "<p>"))
return 0;
if (st->flags & LOWDOWN_HTML_HARD_WRAP) {
for ( ; i < content->size; i++) {
org = i;
while (i < content->size &&
content->data[i] != '\n')
i++;
if (i > org && !hbuf_put
(ob, content->data + org, i - org))
return 0;
/*
* Do not insert a line break if this newline is
* the last character on the paragraph.
*/
if (i >= content->size - 1)
break;
if (!rndr_linebreak(ob))
return 0;
}
} else {
if (!hbuf_put(ob,
content->data + i, content->size - i))
return 0;
}
return HBUF_PUTSL(ob, "</p>\n");
}
static int
rndr_raw_block(struct lowdown_buf *ob,
const struct rndr_blockhtml *param,
const struct html *st)
{
size_t org, sz;
if ((st->flags & LOWDOWN_HTML_SKIP_HTML))
return 1;
if ((st->flags & LOWDOWN_HTML_ESCAPE))
return escape_htmlb(ob, ¶m->text, st);
/*
* FIXME: Do we *really* need to trim the HTML? How does that
* make a difference?
*/
sz = param->text.size;
while (sz > 0 && param->text.data[sz - 1] == '\n')
sz--;
org = 0;
while (org < sz && param->text.data[org] == '\n')
org++;
if (org >= sz)
return 1;
if (!newline(ob))
return 0;
if (!hbuf_put(ob, param->text.data + org, sz - org))
return 0;
return hbuf_putc(ob, '\n');
}
static int
rndr_triple_emphasis(struct lowdown_buf *ob,
const struct lowdown_buf *content)
{
if (!HBUF_PUTSL(ob, "<strong><em>"))
return 0;
if (!hbuf_putb(ob, content))
return 0;
return HBUF_PUTSL(ob, "</em></strong>");
}
static int
rndr_hrule(struct lowdown_buf *ob)
{
if (!newline(ob))
return 0;
return hbuf_puts(ob, "<hr/>\n");
}
static int
rndr_image(struct lowdown_buf *ob,
const struct rndr_image *param,
const struct html *st)
{
char dimbuf[32];
unsigned int x, y;
int rc = 0;
/*
* Scan in our dimensions, if applicable.
* It's unreasonable for them to be over 32 characters, so use
* that as a cap to the size.
*/
if (param->dims.size &&
param->dims.size < sizeof(dimbuf) - 1) {
memset(dimbuf, 0, sizeof(dimbuf));
memcpy(dimbuf, param->dims.data, param->dims.size);
rc = sscanf(dimbuf, "%ux%u", &x, &y);
}
/* Require an "alt", even if blank. */
if (!HBUF_PUTSL(ob, "<img src=\"") ||
!escape_href(ob, ¶m->link, st) ||
!HBUF_PUTSL(ob, "\" alt=\"") ||
!escape_attr(ob, ¶m->alt) ||
!HBUF_PUTSL(ob, "\""))
return 0;
if (param->attr_cls.size)
if (!HBUF_PUTSL(ob, " class=\"") ||
!escape_attr(ob, ¶m->attr_cls) ||
!HBUF_PUTSL(ob, "\""))
return 0;
if (param->attr_id.size)
if (!HBUF_PUTSL(ob, " id=\"") ||
!escape_attr(ob, ¶m->attr_id) ||
!HBUF_PUTSL(ob, "\""))
return 0;
if (param->attr_width.size || param->attr_height.size) {
if (!HBUF_PUTSL(ob, " style=\""))
return 0;
if (param->attr_width.size)
if (!HBUF_PUTSL(ob, "width:") ||
!escape_attr(ob, ¶m->attr_width) ||
!HBUF_PUTSL(ob, ";"))
return 0;
if (param->attr_height.size)
if (!HBUF_PUTSL(ob, "height:") ||
!escape_attr(ob, ¶m->attr_height) ||
!HBUF_PUTSL(ob, ";"))
return 0;
if (!HBUF_PUTSL(ob, "\""))
return 0;
} else if (param->dims.size && rc > 0) {
if (!hbuf_printf(ob, " width=\"%u\"", x))
return 0;
if (rc > 1 && !hbuf_printf(ob, " height=\"%u\"", y))
return 0;
}
if (param->title.size)
if (!HBUF_PUTSL(ob, " title=\"") ||
!escape_htmlb(ob, ¶m->title, st) ||
!HBUF_PUTSL(ob, "\""))
return 0;
return hbuf_puts(ob, " />");
}
static int
rndr_raw_html(struct lowdown_buf *ob,
const struct rndr_raw_html *param,
const struct html *st)
{
if (st->flags & LOWDOWN_HTML_SKIP_HTML)
return 1;
return (st->flags & LOWDOWN_HTML_ESCAPE) ?
escape_htmlb(ob, ¶m->text, st) :
hbuf_putb(ob, ¶m->text);
}
static int
rndr_table(struct lowdown_buf *ob,
const struct lowdown_buf *content)
{
if (!newline(ob))
return 0;
if (!HBUF_PUTSL(ob, "<table>\n"))
return 0;
if (!hbuf_putb(ob, content))
return 0;
return HBUF_PUTSL(ob, "</table>\n");
}
static int
rndr_table_header(struct lowdown_buf *ob,
const struct lowdown_buf *content)
{
if (!newline(ob))
return 0;
if (!HBUF_PUTSL(ob, "<thead>\n"))
return 0;
if (!hbuf_putb(ob, content))
return 0;
return HBUF_PUTSL(ob, "</thead>\n");
}
static int
rndr_table_body(struct lowdown_buf *ob,
const struct lowdown_buf *content)
{
if (content->size == 0)
return 1;
if (!newline(ob))
return 0;
if (!HBUF_PUTSL(ob, "<tbody>\n"))
return 0;
if (!hbuf_putb(ob, content))
return 0;
return HBUF_PUTSL(ob, "</tbody>\n");
}
static int
rndr_tablerow(struct lowdown_buf *ob,
const struct lowdown_buf *content)
{
if (!HBUF_PUTSL(ob, "<tr>\n"))
return 0;
if (!hbuf_putb(ob, content))
return 0;
return HBUF_PUTSL(ob, "</tr>\n");
}
static int
rndr_tablecell(struct lowdown_buf *ob,
const struct lowdown_buf *content,
const struct rndr_table_cell *param)
{
if (param->flags & HTBL_FL_HEADER) {
if (!HBUF_PUTSL(ob, "<th"))
return 0;
} else {
if (!HBUF_PUTSL(ob, "<td"))
return 0;
}
switch (param->flags & HTBL_FL_ALIGNMASK) {
case HTBL_FL_ALIGN_CENTER:
if (!HBUF_PUTSL(ob, " style=\"text-align: center\">"))
return 0;
break;
case HTBL_FL_ALIGN_LEFT:
if (!HBUF_PUTSL(ob, " style=\"text-align: left\">"))
return 0;
break;
case HTBL_FL_ALIGN_RIGHT:
if (!HBUF_PUTSL(ob, " style=\"text-align: right\">"))
return 0;
break;
default:
if (!HBUF_PUTSL(ob, ">"))
return 0;
break;
}
if (!hbuf_putb(ob, content))
return 0;
return (param->flags & HTBL_FL_HEADER) ?
HBUF_PUTSL(ob, "</th>\n") :
HBUF_PUTSL(ob, "</td>\n");
}
static int
rndr_superscript(struct lowdown_buf *ob,
const struct lowdown_buf *content, enum lowdown_rndrt type)
{
const char *elem;
elem = (type == LOWDOWN_SUPERSCRIPT) ? "sup" : "sub";
return hbuf_printf(ob, "<%s>", elem) &&
hbuf_putb(ob, content) &&
hbuf_printf(ob, "</%s>", elem);
}
static int
rndr_normal_text(struct lowdown_buf *ob,
const struct rndr_normal_text *param,
const struct html *st)
{
return escape_htmlb(ob, ¶m->text, st);
}
static int
rndr_footnote_def(struct lowdown_buf *ob,
const struct lowdown_buf *content, size_t num)
{
size_t i = 0;
int pfound = 0;
/* Insert anchor at the end of first paragraph block. */
while ((i + 3) < content->size) {
if (content->data[i++] != '<')
continue;
if (content->data[i++] != '/')
continue;
if (content->data[i++] != 'p' &&
content->data[i] != 'P')
continue;
if (content->data[i] != '>')
continue;
i -= 3;
pfound = 1;
break;
}
if (!hbuf_printf(ob, "\n<li id=\"fn%zu\">\n", num))
return 0;
if (pfound) {
if (!hbuf_put(ob, content->data, i))
return 0;
if (!hbuf_printf(ob, " "
"<a href=\"#fnref%zu\" rev=\"footnote\">"
"↩"
"</a>", num))
return 0;
if (!hbuf_put(ob,
content->data + i, content->size - i))
return 0;
} else {
if (!hbuf_putb(ob, content))
return 0;
}
return HBUF_PUTSL(ob, "</li>\n");
}
static int
rndr_footnote_ref(struct lowdown_buf *ob,
const struct lowdown_buf *content, struct html *st)
{
void *pp;
size_t num = st->footsz + 1;
/*
* Keep a reference to this footnote definition, as we're going
* to print it out at the end of the document. For now,
* suppress printing of the content.
*/
pp = recallocarray(st->foots, st->footsz,
st->footsz + 1, sizeof(struct lowdown_buf *));
if (pp == NULL)
return 0;
st->foots = pp;
if ((st->foots[st->footsz++] = hbuf_dup(content)) == NULL)
return 0;
return hbuf_printf(ob,
"<sup id=\"fnref%zu\">"
"<a href=\"#fn%zu\" rel=\"footnote\">"
"%zu</a></sup>", num, num, num);
}
static int
rndr_math(struct lowdown_buf *ob,
const struct rndr_math *param,
const struct html *st)
{
if (param->blockmode && !HBUF_PUTSL(ob, "\\["))
return 0;
else if (!param->blockmode && !HBUF_PUTSL(ob, "\\("))
return 0;
if (!escape_htmlb(ob, ¶m->text, st))
return 0;
return param->blockmode ?
HBUF_PUTSL(ob, "\\]") :
HBUF_PUTSL(ob, "\\)");
}
static int
rndr_doc_footer(struct lowdown_buf *ob, const struct html *st)
{
size_t i;
/*
* Start by flushing out our footnotes. Footnotes are "sparse"
* in that we may not have them all defined (?).
*/
if (st->footsz > 0) {
if (!newline(ob))
return 0;
if (!HBUF_PUTSL(ob,
"<div class=\"footnotes\">\n<hr/>\n<ol>\n"))
return 0;
for (i = 0; i < st->footsz; i++)
if (!rndr_footnote_def(ob, st->foots[i], i + 1))
return 0;
if (!HBUF_PUTSL(ob, "\n</ol>\n</div>\n"))
return 0;
}
return (st->flags & LOWDOWN_STANDALONE) ?
HBUF_PUTSL(ob, "</body>\n") : 1;
}
static int
rndr_root(struct lowdown_buf *ob,
const struct lowdown_buf *content,
const struct lowdown_metaq *mq,
const struct html *st)
{
const struct lowdown_meta *m;
const char *lang = NULL;
TAILQ_FOREACH(m, mq, entries)
if (strcasecmp(m->key, "lang") == 0)
lang = m->value;
if (st->flags & LOWDOWN_STANDALONE) {
if (!HBUF_PUTSL(ob, "<!DOCTYPE html>\n"))
return 0;
if (lang == NULL) {