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authorJohn MacFarlane <jgm@berkeley.edu>2015-03-29 22:14:12 -0700
committerJohn MacFarlane <jgm@berkeley.edu>2015-03-29 22:14:32 -0700
commit8a04d10c5570231baa4326817d7f10f8f1f04a57 (patch)
treeef6d0d53114f0ff88a05bda083b92b588dfcd431 /src
parentf99a680b089eee01797e085a6d9f5c5398907a57 (diff)
commonmark renderer - render links as autolinks when appropriate.
Diffstat (limited to 'src')
-rw-r--r--src/commonmark.c91
1 files changed, 70 insertions, 21 deletions
diff --git a/src/commonmark.c b/src/commonmark.c
index 9f093c3..dcf2e63 100644
--- a/src/commonmark.c
+++ b/src/commonmark.c
@@ -9,6 +9,7 @@
#include "node.h"
#include "buffer.h"
#include "utf8.h"
+#include "scanners.h"
// Functions to convert cmark_nodes to commonmark strings.
@@ -43,8 +44,7 @@ typedef enum {
LITERAL,
NORMAL,
TITLE,
- URL,
- BRACED_URL
+ URL
} escaping;
static inline bool
@@ -69,8 +69,6 @@ needs_escaping(escaping escape,
} else if (escape == URL) {
return (c == '`' || c == '<' || c == '>' || isspace(c) ||
c == '\\' || c == ')' || c == '(');
- } else if (escape == BRACED_URL) {
- return (c == '`' || c == '<' || c == '>' || c == '\\');
} else {
return false;
}
@@ -233,6 +231,33 @@ shortest_unused_backtick_sequence(cmark_chunk *code)
return i;
}
+static bool
+is_autolink(cmark_node *node)
+{
+ const char *title;
+ const char *url;
+
+ if (node->type != CMARK_NODE_LINK) {
+ return false;
+ }
+
+ url = cmark_node_get_url(node);
+ if (url == NULL ||
+ _scan_scheme((unsigned char *)url) == 0) {
+ return false;
+ }
+
+ title = cmark_node_get_title(node);
+ // if it has a title, we can't treat it as an autolink:
+ if (title != NULL && strnlen(title, 1) > 0) {
+ return false;
+ }
+ cmark_consolidate_text_nodes(node);
+ return (strncmp(url,
+ (char*)node->as.literal.data,
+ node->as.literal.len) == 0);
+}
+
// if node is a block node, returns node.
// otherwise returns first block-level node that is an ancestor of node.
static cmark_node*
@@ -326,7 +351,7 @@ S_render_node(cmark_node *node, cmark_event_type ev_type,
list_delim == CMARK_PAREN_DELIM ?
")" : ".",
list_number < 10 ? " " : " ");
- marker_width = strlen(listmarker);
+ marker_width = strnlen(listmarker, 63);
}
if (entering) {
if (cmark_node_get_list_type(node->parent) ==
@@ -367,7 +392,7 @@ S_render_node(cmark_node *node, cmark_event_type ev_type,
// use indented form if no info, and code doesn't
// begin or end with a blank line, and code isn't
// first thing in a list item
- if ((info == NULL || strlen(info) == 0) &&
+ if ((info == NULL || strnlen(info, 1) == 0) &&
(code->len > 2 &&
!isspace(code->data[0]) &&
!(isspace(code->data[code->len - 1]) &&
@@ -483,21 +508,40 @@ S_render_node(cmark_node *node, cmark_event_type ev_type,
break;
case CMARK_NODE_LINK:
- if (entering) {
- lit(state, "[", false);
+ if (is_autolink(node)) {
+ if (entering) {
+ lit(state, "<", false);
+ if (strncmp(cmark_node_get_url(node),
+ "mailto:", 7) == 0) {
+ lit(state,
+ (char *)cmark_node_get_url(node) + 7,
+ false);
+ } else {
+ lit(state,
+ (char *)cmark_node_get_url(node),
+ false);
+ }
+ lit(state, ">", false);
+ // return signal to skip contents of node...
+ return 0;
+ }
} else {
- // TODO - emit autolink when url matches link text
- // TODO - backslash-escape " and \ inside url, title
- // for both links and images
- lit(state, "](", false);
- out(state, cmark_chunk_literal(cmark_node_get_url(node)), false, URL);
- title = cmark_node_get_title(node);
- if (title && strlen(title) > 0) {
- lit(state, " \"", true);
- out(state, cmark_chunk_literal(title), false, TITLE);
- lit(state, "\"", false);
+ if (entering) {
+ lit(state, "[", false);
+ } else {
+ lit(state, "](", false);
+ out(state,
+ cmark_chunk_literal(cmark_node_get_url(node)),
+ false, URL);
+ title = cmark_node_get_title(node);
+ if (title && strnlen(title, 1) > 0) {
+ lit(state, " \"", true);
+ out(state, cmark_chunk_literal(title),
+ false, TITLE);
+ lit(state, "\"", false);
+ }
+ lit(state, ")", false);
}
- lit(state, ")", false);
}
break;
@@ -508,7 +552,7 @@ S_render_node(cmark_node *node, cmark_event_type ev_type,
lit(state, "](", false);
out(state, cmark_chunk_literal(cmark_node_get_url(node)), false, URL);
title = cmark_node_get_title(node);
- if (title && strlen(title) > 0) {
+ if (title && strnlen(title, 1) > 0) {
lit(state, " \"", true);
out(state, cmark_chunk_literal(title), false, TITLE);
lit(state, "\"", false);
@@ -542,7 +586,12 @@ char *cmark_render_commonmark(cmark_node *root, int options, int width)
while ((ev_type = cmark_iter_next(iter)) != CMARK_EVENT_DONE) {
cur = cmark_iter_get_node(iter);
- S_render_node(cur, ev_type, &state);
+ if (!S_render_node(cur, ev_type, &state)) {
+ // a false value causes us to skip processing
+ // the node's contents. this is used for
+ // autolinks.
+ cmark_iter_reset(iter, cur, CMARK_EVENT_EXIT);
+ }
}
result = (char *)cmark_strbuf_detach(&commonmark);