feat: gemtext parser, pre tag

src/parsers/gemtext.rs

@@ -0,0 +1,68 @@
+use crate::abstractions::{Body, HeadingLevel, NotNullBody, Tag};
+
+#[derive(Debug)]
+pub enum GemTextParseError {
+    InvalidLink,
+}
+
+pub fn parse_gemtext(s: String) -> Result<Vec<Tag>, GemTextParseError> {
+    let mut page: Vec<Tag> = Vec::new();
+    let mut preformatted = false;
+    let mut preformatted_text = String::new();
+
+    let mut before_is_ordered_list = false;
+    let mut ordered_list: Vec<Tag> = Vec::new();
+
+    for line in s.lines() {
+        let mut line = line.trim().to_owned();
+
+        if before_is_ordered_list && !line.starts_with("* ") {
+            page.push(Tag::Ul(ordered_list.clone()));
+            before_is_ordered_list = false;
+            ordered_list.clear();
+        } else if preformatted && !line.starts_with("```") {
+            preformatted_text.push_str(&line);
+            preformatted_text.push('\n');
+        } else if line.starts_with("=>") {
+            let body = line.split_off(2);
+            let mut body = body.trim().splitn(2, " ");
+
+            let url = body.next().ok_or(GemTextParseError::InvalidLink)?.trim();
+
+            match body.next() {
+                Some(label) => page.push(Tag::Link(
+                    Body::Text(label.trim().to_owned()),
+                    url.to_owned(),
+                )),
+                None => page.push(Tag::Link(Body::Null, url.to_owned())),
+            };
+        } else if line.starts_with("# ") {
+            let body = line.split_off(2);
+            page.push(Tag::H(body.trim().to_owned(), HeadingLevel::One));
+        } else if line.starts_with("## ") {
+            let body = line.split_off(3);
+            page.push(Tag::H(body.trim().to_owned(), HeadingLevel::Two));
+        } else if line.starts_with("### ") {
+            let body = line.split_off(4);
+            page.push(Tag::H(body.trim().to_owned(), HeadingLevel::Three));
+        } else if line.starts_with("* ") {
+            before_is_ordered_list = true;
+            let body = line.split_off(2);
+            ordered_list.push(Tag::El(NotNullBody::Text(body)));
+        } else if line.starts_with("> ") {
+            let body = line.split_off(2);
+            page.push(Tag::Bq(NotNullBody::Text(body)));
+        } else if line.starts_with("```") {
+            if preformatted {
+                page.push(Tag::Pre(preformatted_text.clone()));
+                preformatted_text.clear();
+            }
+
+            preformatted = !preformatted;
+        } else if !line.is_empty() {
+            page.push(Tag::P(NotNullBody::Text(line)));
+        }
+    }
+
+    Ok(page)
+}

src/parsers/mod.rs

@@ -0,0 +1 @@
+pub mod gemtext;