Add word-level parsing

src/syntax/content/parser/token/preformat.rs

@@ -0,0 +1,43 @@
+use crate::{
+    syntax::content::{Parseable, Lexeme},
+};
+
+pub struct PreFormat {
+    open: Option<bool>,
+}
+
+impl PreFormat {
+    pub fn new(open: bool) -> PreFormat {
+        PreFormat { open: Some(open) }
+    }
+}
+
+impl Parseable for PreFormat {
+    fn probe(lexeme: &Lexeme) -> bool {
+        let chars = lexeme.split_chars();
+
+        if let Some(first_char) = chars.first() {
+            *first_char == '`'
+        } else {
+            false
+        }
+    }
+
+    fn lex(_lexeme: &Lexeme) -> PreFormat {
+        PreFormat { open: None }
+    }
+
+    fn render(&self) -> String {
+        if let Some(o) = self.open {
+            if o {
+                "<pre>".to_owned()
+            } else {
+                "</pre>".to_owned()
+            }
+        } else {
+            panic!(
+                "Attempt to render a preformat tag while open state is unknown"
+            )
+        }
+    }
+}