commit a6dc7f2f92162dc9a9930c3fe676c23a03ef35b8 (patch)
parent eb4048f4d179f2329d77827831af06da52947de9
Author: Alex Karle <alex@alexkarle.com>
Date: Wed, 15 Dec 2021 00:25:31 -0500
Add initial support for links
Diffstat:
| M | blag.c | | | 103 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------- |
1 file changed, 86 insertions(+), 17 deletions(-)
diff --git a/blag.c b/blag.c
@@ -20,23 +20,13 @@
*
* Inline `code`
*
- * TODO:
+ * Escaping via \
+ *
* [[url|Links]]
- * -> if we see [[
- * -> print out <a href="
- * -> while in link
- * -> push into buf
- * -> putchar
- * -> if we see |
- * -> printf ">
- * -> just putchar
- * -> else
- * -> printf ">url
- * -> once we hit ]]
- * -> </a>
*
- * --> error reporting for unclosed links??
- * -> errx in closeblock() if in link parser
+ * TODO:
+ * -----
+ * - error reporting for malformed blocks
*/
#include <stdio.h>
#include <err.h>
@@ -60,6 +50,10 @@ enum Block {
OLIST_START,
OLIST_PARSE,
OLIST_BREAK,
+ LINK_URL_PARSE,
+ LINK_DESC_PARSE,
+ POTENTIAL_LINK,
+ POTENTIAL_LINK_END
};
int closeblock(int in, int hlvl) {
@@ -100,13 +94,47 @@ int closeblock(int in, int hlvl) {
}
int parse() {
- /* Mini state machine */
+ /* Mini state machine (home grown spaghetti code)
+ *
+ * Key: global "line level" state in `in`, secondary mid-line states
+ * (inline code & links) use dedicated states. A newline triggers many of
+ * the line-level blocks to enter "BREAK" mode, where they can either
+ * continue or truly be broken on a second newline (PARAGRAPH, CODE,
+ * U/OLIST, etc). Several of the variable length tokens (like ordered
+ * list numbers, header level, etc) enter a "PARSE" mode where special
+ * action is taken until the parsing is done (usually on ' ', but for
+ * links on '|')
+ */
int c;
enum Block in = NONE;
+ enum Block in_link = NONE;
int hlvl = 0;
int in_code;
+ int escape = 0;
while ((c = getchar()) != EOF) {
+ /* Handle Escapes before all else */
+ if (escape) {
+ if (in == NONE) {
+ in = PARAGRAPH;
+ printf("<p>\n");
+ }
+ putchar(c);
+ escape = 0;
+ continue;
+ }
+
+ /* Reset special "potential" states */
+ if (c != '[' && in_link == POTENTIAL_LINK) {
+ in_link = NONE;
+ } else if (c != ']' && in_link == POTENTIAL_LINK_END) {
+ in_link = NONE;
+ }
+
+ /* Handle unique state changes by char */
switch (c) {
+ case '\\':
+ escape = 1;
+ break;
case '#':
if (in == NONE) {
in = HEADER_PARSE;
@@ -120,7 +148,7 @@ int parse() {
break;
case ' ':
if (in == HEADER_PARSE) {
- printf("</h%d>", hlvl);
+ printf("<h%d>", hlvl);
in = HEADER;
} else if (in == ULIST_START) {
printf("<ul>\n <li>");
@@ -155,6 +183,8 @@ int parse() {
printf("<code><pre>\n");
} else if (in == CODE_BREAK) {
in = CODE;
+ } else {
+ putchar(c);
}
break;
case '>':
@@ -163,6 +193,45 @@ int parse() {
printf("<blockquote>\n");
} else if (in == QUOTE_BREAK) {
in = QUOTE;
+ } else {
+ putchar(c);
+ }
+ break;
+ case '[':
+ if (in_link == NONE) {
+ in_link = POTENTIAL_LINK;
+ } else if (in_link == POTENTIAL_LINK) {
+ if (in == NONE) {
+ /* Assume this is a new paragraph */
+ in = PARAGRAPH;
+ printf("<p>\n");
+ }
+ /* XXX: need to print the first link */
+ in_link = LINK_URL_PARSE;
+ printf("<a href=\"");
+ } else if (in_link == LINK_URL_PARSE) {
+ /* TODO: save to linkbuf to support [[url]] links? */
+ putchar(c);
+ } else {
+ putchar(c);
+ }
+ break;
+ case '|':
+ if (in_link == LINK_URL_PARSE) {
+ in_link = LINK_DESC_PARSE;
+ printf("\">");
+ } else {
+ putchar(c);
+ }
+ break;
+ case ']':
+ if (in_link == LINK_DESC_PARSE) {
+ in_link = POTENTIAL_LINK_END;
+ } else if (in_link == POTENTIAL_LINK_END) {
+ in_link = NONE;
+ printf("</a>");
+ } else {
+ putchar(c);
}
break;
case '*':
