Add lexeme 'first' field, refactor and add methods

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

@@ -15,14 +15,14 @@ impl CheckBox {
 
 impl Parseable for CheckBox {
     fn probe(lexeme: &Lexeme) -> bool {
-        lexeme.match_triple_as_char(('[', ' ', ']'))
-            || lexeme.match_triple_as_char(('[', 'x', ']'))
+        lexeme.match_char_triple('[', ' ', ']')
+            || lexeme.match_char_triple('[', 'x', ']')
     }
 
     fn lex(lexeme: &Lexeme) -> CheckBox {
         use crate::prelude::*;
         log!("Lexing: {lexeme}");
-        if lexeme.match_next_as_char('x') {
+        if lexeme.match_next_char('x') {
             CheckBox::new(true)
         } else {
             CheckBox::new(false)

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

@@ -83,7 +83,9 @@ impl Parseable for Header {
             == 0
         {
             let level = lexeme.text().len();
-            lexeme.clone().split_words().len() == 1 && level > 0 && level <= 6
+            lexeme.clone().split_segments().len() == 1
+                && level > 0
+                && level <= 6
         } else {
             false
         }

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

@@ -11,7 +11,7 @@ impl Paragraph {
     }
 
     pub fn probe_end(lexeme: &Lexeme) -> bool {
-        lexeme.match_as_char('\n') && lexeme.match_next_as_char('\n')
+        lexeme.match_char('\n') && lexeme.match_next_char('\n')
     }
 }
 

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

@@ -15,7 +15,7 @@ impl Strike {
 
 impl Parseable for Strike {
     fn probe(lexeme: &Lexeme) -> bool {
-        lexeme.match_as_char('~') && lexeme.match_next_as_char('~')
+        lexeme.match_char('~') && lexeme.match_next_char('~')
     }
 
     fn lex(_lexeme: &Lexeme) -> Strike {

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

@@ -15,7 +15,7 @@ impl Underline {
 
 impl Parseable for Underline {
     fn probe(lexeme: &Lexeme) -> bool {
-        lexeme.match_as_char('_') && lexeme.match_next_as_char('_')
+        lexeme.match_char('_') && lexeme.match_next_char('_')
     }
 
     fn lex(_lexeme: &Lexeme) -> Underline {