From 6c5fbc2af10d41fbad252661068357bbd698c158 Mon Sep 17 00:00:00 2001
From: Noah Hellman <noah@hllmn.net>
Date: Mon, 21 Nov 2022 19:56:11 +0100
Subject: [PATCH] wip parse inner

---
 src/inline.rs | 43 +++++++++++++++++++++++++++++++++----------
 src/lex.rs    | 30 ++++++++++++++----------------
 src/lib.rs    |  2 +-
 3 files changed, 48 insertions(+), 27 deletions(-)

diff --git a/src/inline.rs b/src/inline.rs
index 7ee0e80..f086d77 100644
--- a/src/inline.rs
+++ b/src/inline.rs
@@ -77,22 +77,42 @@ pub enum Dir {
     Both,
 }
 
-pub struct Parser<I: Iterator<Item = char>> {
-    tokens: std::iter::Peekable<lex::Lexer<I>>,
+pub struct Parser {
     openers: Vec<Container>,
+    events: Vec<Event>,
     //tree: tree::Builder<Container, Atom>,
 }
 
-impl<I: Iterator<Item = char>> Parser<I> {
-    pub fn new(chars: I) -> Self {
+impl Parser {
+    pub fn new() -> Self {
         Self {
-            tokens: lex::Lexer::new(chars).peekable(),
             openers: Vec::new(),
+            events: Vec::new(),
         }
     }
 
-    pub fn parse(mut self, evs: &mut Vec<Event>) {
-        while let Some(t) = self.tokens.next() {
+    /*
+    pub fn parse(mut self, src: &str) -> impl Iterator<Event> {
+        todo!()
+    }
+    */
+}
+
+struct Parse<'s> {
+    src: &'s str,
+    lexer: lex::Lexer<'s>,
+    events: &'s mut Vec<Event>,
+}
+
+impl<'s> Parse<'s> {
+    fn new(src: &'s str, events: &'s mut Vec<Event>) -> Self {
+        todo!()
+    }
+
+    /*
+    fn parse(mut self, src: &str, evs: &mut Vec<Event>) {
+        let mut chars = src.chars();
+        while let Some(t) = chars.next() {
             {
                 let verbatim_opt = match t.kind {
                     lex::Kind::Seq(lex::Sequence::Dollar) => {
@@ -101,7 +121,7 @@ impl<I: Iterator<Item = char>> Parser<I> {
                                 if let Some(lex::Token {
                                     kind: lex::Kind::Seq(lex::Sequence::Backtick),
                                     len,
-                                }) = self.tokens.peek()
+                                }) = self.chars.clone().next()
                                 {
                                     Some((DisplayMath, *len))
                                 } else {
@@ -110,7 +130,7 @@ impl<I: Iterator<Item = char>> Parser<I> {
                             })
                             .flatten();
                         if math_opt.is_some() {
-                            self.tokens.next(); // backticks
+                            chars.next(); // backticks
                         }
                         math_opt
                     }
@@ -119,7 +139,7 @@ impl<I: Iterator<Item = char>> Parser<I> {
                 };
 
                 if let Some((atom, opener_len)) = verbatim_opt {
-                    for tok in self.tokens {
+                    for tok in chars {
                         if let lex::Kind::Seq(lex::Sequence::Backtick) = tok.kind {
                             if tok.len >= opener_len {
                                 break;
@@ -188,6 +208,7 @@ impl<I: Iterator<Item = char>> Parser<I> {
             }
         }
     }
+*/
 }
 
 /*
@@ -213,3 +234,5 @@ impl<'s> Iterator for Parser<'s> {
     }
 }
 */
+
+mod test {}
diff --git a/src/lex.rs b/src/lex.rs
index d5742b7..958dba1 100644
--- a/src/lex.rs
+++ b/src/lex.rs
@@ -1,9 +1,9 @@
 use crate::EOF;
 
 use Delimiter::*;
+use Kind::*;
 use Sequence::*;
 use Symbol::*;
-use Kind::*;
 
 #[derive(Debug)]
 pub(crate) struct Token {
@@ -78,35 +78,33 @@ impl Sequence {
     }
 }
 
-pub(crate) struct Lexer<I: Iterator<Item = char>> {
-    chars: std::iter::Peekable<I>,
+pub(crate) struct Lexer<'s> {
+    src: &'s str,
+    chars: std::str::Chars<'s>,
     escape: bool,
     next: Option<Token>,
-    len: usize,
 }
 
-impl<I: Iterator<Item = char>> Lexer<I> {
-    pub fn new(chars: I) -> Lexer<I> {
+impl<'s> Lexer<'s> {
+    pub fn new(src: &'s str) -> Lexer<'s> {
         Lexer {
-            chars: chars.peekable(),
+            src,
+            chars: src.chars(),
             escape: false,
             next: None,
-            len: 0,
         }
     }
 
     fn peek(&mut self) -> char {
-        self.chars.peek().copied().unwrap_or(EOF)
+        self.chars.clone().next().unwrap_or(EOF)
     }
 
     fn eat(&mut self) -> Option<char> {
-        let c = self.chars.next();
-        self.len += c.map_or(0, char::len_utf8);
-        c
+        self.chars.next()
     }
 
     fn len(&self) -> usize {
-        self.len
+        self.src.len() - self.chars.as_str().len()
     }
 
     fn eat_while(&mut self, mut predicate: impl FnMut(char) -> bool) {
@@ -222,7 +220,7 @@ impl<I: Iterator<Item = char>> Lexer<I> {
     }
 }
 
-impl<I: Iterator<Item = char>> Iterator for Lexer<I> {
+impl<'s> Iterator for Lexer<'s> {
     type Item = Token;
 
     fn next(&mut self) -> Option<Self::Item> {
@@ -248,14 +246,14 @@ impl<I: Iterator<Item = char>> Iterator for Lexer<I> {
 #[cfg(test)]
 mod test {
     use super::Delimiter::*;
+    use super::Kind::*;
     use super::Sequence::*;
     use super::Symbol::*;
-    use super::Kind::*;
 
     macro_rules! test_lex {
         ($($st:ident,)? $src:expr $(,$($token:expr),* $(,)?)?) => {
             #[allow(unused)]
-            let actual = super::Lexer::new($src.chars()).map(|t| t.kind).collect::<Vec<_>>();
+            let actual = super::Lexer::new($src).map(|t| t.kind).collect::<Vec<_>>();
             let expected = vec![$($($token),*,)?];
             assert_eq!(actual, expected, "{}", $src);
         };
diff --git a/src/lib.rs b/src/lib.rs
index bb89ae6..ab7d125 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -83,7 +83,7 @@ impl<'s> Iterator for Iter<'s> {
                 let chars = (&mut self.tree)
                     .take_while(|ev| matches!(ev, tree::Event::Element(..)))
                     .flat_map(|ev| ev.span().of(self.src).chars());
-                inline::Parser::new(chars).parse(&mut self.events);
+                //inline::Parser::new(chars).parse(&mut self.events);
                 /*
                 let chars = std::iter::from_fn(|| {
                     let mut eat = false;