/*
* GitHub style code block:
*
* <pre lang="LANG"><code>
* ...
* </pre></code>
*
* Unlike other parsers, we store the language identifier in the <pre>,
* and don't let the user generate custom classes.
*
* The language identifier in the <pre> block gets postprocessed and all
* the code inside gets syntax highlighted with Pygments. This is much safer
* than letting the user specify a CSS class for highlighting.
*
* Note that we only generate HTML for the first specifier.
* E.g.
* ~~~~ {.python .numbered} => <pre lang="python"><code>
*/
static void
rndr_blockcode_github(struct buf *ob, struct buf *text, struct buf *lang, void *opaque)
{
if (ob->size) bufputc(ob, '\n');
if (lang && lang->size) {
size_t i = 0;
BUFPUTSL(ob, "<pre lang=\"");
while (i < lang->size && !isspace(lang->data[i]))
i++;
if (lang->data[0] == '.')
attr_escape(ob, lang->data + 1, i - 1);
else
attr_escape(ob, lang->data, i);
BUFPUTSL(ob, "\"><code>");
} else
BUFPUTSL(ob, "<pre><code>");
if (text)
attr_escape(ob, text->data, text->size);
BUFPUTSL(ob, "</code></pre>\n");
}
static void
rndr_blockcode(struct buf *ob, struct buf *text, struct buf *lang, void *opaque)
{
if (ob->size) bufputc(ob, '\n');
if (lang && lang->size) {
size_t i, cls;
BUFPUTSL(ob, "<pre><code class=\"");
for (i = 0, cls = 0; i < lang->size; ++i, ++cls) {
while (i < lang->size && isspace(lang->data[i]))
i++;
if (i < lang->size) {
size_t org = i;
while (i < lang->size && !isspace(lang->data[i]))
i++;
if (lang->data[org] == '.')
org++;
if (cls) bufputc(ob, ' ');
attr_escape(ob, lang->data + org, i - org);
}
}
BUFPUTSL(ob, "\">");
} else
BUFPUTSL(ob, "<pre><code>");
if (text)
attr_escape(ob, text->data, text->size);
BUFPUTSL(ob, "</code></pre>\n");
}
/********************
* GENERIC RENDERER *
********************/
static int
rndr_autolink(struct buf *ob, struct buf *link, enum mkd_autolink type, void *opaque)
{
struct html_renderopt *options = opaque;
if (!link || !link->size)
return 0;
if ((options->flags & HTML_SAFELINK) != 0 &&
!is_safe_link(link->data, link->size) &&
type != MKDA_EMAIL)
return 0;
BUFPUTSL(ob, "<a href=\"");
if (type == MKDA_EMAIL)
BUFPUTSL(ob, "mailto:");
bufput(ob, link->data, link->size);
BUFPUTSL(ob, "\">");
/*
* 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 (bufprefix(link, "mailto:") == 0) {
attr_escape(ob, link->data + 7, link->size - 7);
} else {
attr_escape(ob, link->data, link->size);
}
BUFPUTSL(ob, "</a>");
return 1;
}
static int
rndr_image(struct buf *ob, struct buf *link, struct buf *title, struct buf *alt, void *opaque)
{
if (!link || !link->size) return 0;
BUFPUTSL(ob, "<img src=\"");
attr_escape(ob, link->data, link->size);
BUFPUTSL(ob, "\" alt=\"");
if (alt && alt->size)
attr_escape(ob, alt->data, alt->size);
if (title && title->size) {
BUFPUTSL(ob, "\" title=\"");
attr_escape(ob, title->data, title->size); }
BUFPUTSL(ob, "\" />");
return 1;
}
static int
rndr_raw_html(struct buf *ob, struct buf *text, void *opaque)
{
struct xhtml_renderopt *options = opaque;
int escape_html = 0;
if (options->flags & XHTML_SKIP_HTML)
escape_html = 1;
else if ((options->flags & XHTML_SKIP_STYLE) != 0 && is_html_tag(text, "style"))
escape_html = 1;
else if ((options->flags & XHTML_SKIP_LINKS) != 0 && is_html_tag(text, "a"))
escape_html = 1;
else if ((options->flags & XHTML_SKIP_IMAGES) != 0 && is_html_tag(text, "img"))
escape_html = 1;
if (escape_html)
attr_escape(ob, text->data, text->size);
else
bufput(ob, text->data, text->size);
return 1;
}
static void
rndr_blockcode(struct buf *ob, struct buf *text, struct buf *lang, void *opaque)
{
if (ob->size) bufputc(ob, '\n');
if (lang && lang->size) {
size_t i = 0;
BUFPUTSL(ob, "<pre><code class=\"");
for (i = 0; i < lang->size; ++i) {
if (lang->data[i] == '.' && (i == 0 || isspace(lang->data[i - 1])))
continue;
bufputc(ob, lang->data[i]);
}
BUFPUTSL(ob, "\">");
} else
BUFPUTSL(ob, "<pre><code>");
if (text)
attr_escape(ob, text->data, text->size);
BUFPUTSL(ob, "</code></pre>\n");
}
static int
rndr_codespan(struct buf *ob, struct buf *text, void *opaque)
{
BUFPUTSL(ob, "<code>");
if (text) attr_escape(ob, text->data, text->size);
BUFPUTSL(ob, "</code>");
return 1;
}
static int
rndr_image(struct buf *ob, struct buf *link, struct buf *title, struct buf *alt, void *opaque)
{
struct html_renderopt *options = opaque;
if (!link || !link->size) return 0;
BUFPUTSL(ob, "<img src=\"");
attr_escape(ob, link->data, link->size);
BUFPUTSL(ob, "\" alt=\"");
if (alt && alt->size)
attr_escape(ob, alt->data, alt->size);
if (title && title->size) {
BUFPUTSL(ob, "\" title=\"");
attr_escape(ob, title->data, title->size); }
bufputc(ob, '"');
bufputs(ob, options->close_tag);
return 1;
}
static int
rndr_link(struct buf *ob, struct buf *link, struct buf *title, struct buf *content, void *opaque)
{
struct html_renderopt *options = opaque;
if ((options->flags & HTML_SAFELINK) != 0 && !is_safe_link(link->data, link->size))
return 0;
BUFPUTSL(ob, "<a href=\"");
if (link && link->size) bufput(ob, link->data, link->size);
if (title && title->size) {
BUFPUTSL(ob, "\" title=\"");
attr_escape(ob, title->data, title->size); }
BUFPUTSL(ob, "\">");
if (content && content->size) bufput(ob, content->data, content->size);
BUFPUTSL(ob, "</a>");
return 1;
}
static void
rndr_normal_text(struct buf *ob, struct buf *text, void *opaque)
{
if (text)
attr_escape(ob, text->data, text->size);
}