From f67606cbdb43ea6e46372feb80c49e91db05725b Mon Sep 17 00:00:00 2001
From: Ben Bridle <ben@derelict.engineering>
Date: Sun, 19 Jan 2025 19:58:14 +1300
Subject: Implement Math block

A math block is a line that begins and ends with a pair of dollar-signs.
---
 src/lib.rs | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

(limited to 'src/lib.rs')

diff --git a/src/lib.rs b/src/lib.rs
index e75221c..ac00e3b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -108,9 +108,12 @@ impl MarkdownDocument {
                     Block::Heading { level, line: Line::from_str(&line) }),
                 BlockLine::Break => blocks.push(Block::Break),
                 BlockLine::BlankLine => (),
-                BlockLine::Paragraph(line) => match parse_embed(&line) {
-                    Some(embed) => blocks.push(embed),
-                    None => blocks.push(Block::Paragraph(Line::from_str(&line))),
+                BlockLine::Paragraph(line) => if let Some(embed) = parse_embed(&line) {
+                    blocks.push(embed)
+                } else if let Some(math) = parse_math(&line) {
+                    blocks.push(math)
+                } else {
+                    blocks.push(Block::Paragraph(Line::from_str(&line)))
                 }
             }
         }
@@ -157,3 +160,12 @@ fn parse_embed(line: &str) -> Option<Block> {
     return None;
 }
 
+fn parse_math(line: &str) -> Option<Block> {
+    let line = line.trim();
+    if let Some(stripped) = line.strip_prefix("$$") {
+        if let Some(stripped) = stripped.strip_suffix("$$") {
+            return Some(Block::Math(stripped.trim().to_string()))
+        }
+    }
+    return None;
+}
-- 
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