From d2a7c1fb0344971ac537e15d1a4b00fe18ff8c43 Mon Sep 17 00:00:00 2001
From: Titus Wormer <tituswormer@gmail.com>
Date: Mon, 18 Jul 2022 17:24:32 +0200
Subject: Refactor to improve performance when constructs are turned off

---
 src/content/text.rs | 75 ++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 48 insertions(+), 27 deletions(-)

(limited to 'src/content/text.rs')

diff --git a/src/content/text.rs b/src/content/text.rs
index f797b11..8d63de9 100644
--- a/src/content/text.rs
+++ b/src/content/text.rs
@@ -29,36 +29,53 @@ use crate::construct::{
 };
 use crate::tokenizer::{Code, State, StateFnResult, Tokenizer};
 
-const MARKERS: [Code; 12] = [
-    Code::VirtualSpace, // `whitespace`
-    Code::Char('\t'),   // `whitespace`
-    Code::Char(' '),    // `hard_break_trailing`, `whitespace`
-    Code::Char('!'),    // `label_start_image`
-    Code::Char('&'),    // `character_reference`
-    Code::Char('*'),    // `attention`
-    Code::Char('<'),    // `autolink`, `html_text`
-    Code::Char('['),    // `label_start_link`
-    Code::Char('\\'),   // `character_escape`, `hard_break_escape`
-    Code::Char(']'),    // `label_end`
-    Code::Char('_'),    // `attention`
-    Code::Char('`'),    // `code_text`
-];
-
 /// Before text.
-///
-/// First we assume character reference.
-///
-/// ```markdown
-/// |&amp;
-/// |\&
-/// |qwe
-/// ```
 pub fn start(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
+    let mut markers = vec![
+        Code::VirtualSpace, // `whitespace`
+        Code::Char('\t'),   // `whitespace`
+        Code::Char(' '),    // `hard_break_trailing`, `whitespace`
+    ];
+
+    if tokenizer.parse_state.constructs.label_start_image {
+        markers.push(Code::Char('!'));
+    }
+    if tokenizer.parse_state.constructs.character_reference {
+        markers.push(Code::Char('&'));
+    }
+    if tokenizer.parse_state.constructs.attention {
+        markers.push(Code::Char('*'));
+    }
+    if tokenizer.parse_state.constructs.autolink || tokenizer.parse_state.constructs.html_text {
+        markers.push(Code::Char('<'));
+    }
+    if tokenizer.parse_state.constructs.label_start_link {
+        markers.push(Code::Char('['));
+    }
+    if tokenizer.parse_state.constructs.character_escape
+        || tokenizer.parse_state.constructs.hard_break_escape
+    {
+        markers.push(Code::Char('\\'));
+    }
+    if tokenizer.parse_state.constructs.label_end {
+        markers.push(Code::Char(']'));
+    }
+    if tokenizer.parse_state.constructs.attention {
+        markers.push(Code::Char('_'));
+    }
+    if tokenizer.parse_state.constructs.code_text {
+        markers.push(Code::Char('`'));
+    }
+
+    before_marker(tokenizer, code, markers)
+}
+
+/// Before text.
+fn before_marker(tokenizer: &mut Tokenizer, code: Code, markers: Vec<Code>) -> StateFnResult {
     match code {
         Code::None => (State::Ok, None),
         _ => tokenizer.attempt_n(
             vec![
-                // To do: build this vec based on whether they are enabled?
                 Box::new(attention),
                 Box::new(autolink),
                 Box::new(character_escape),
@@ -72,7 +89,10 @@ pub fn start(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
                 Box::new(label_start_link),
                 Box::new(whitespace),
             ],
-            |ok| Box::new(if ok { start } else { before_data }),
+            |ok| {
+                let func = if ok { before_marker } else { before_data };
+                Box::new(move |t, c| func(t, c, markers))
+            },
         )(tokenizer, code),
     }
 }
@@ -82,6 +102,7 @@ pub fn start(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
 /// ```markdown
 /// |qwe
 /// ```
-fn before_data(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
-    tokenizer.go(|t, c| data(t, c, MARKERS.to_vec()), start)(tokenizer, code)
+fn before_data(tokenizer: &mut Tokenizer, code: Code, markers: Vec<Code>) -> StateFnResult {
+    let copy = markers.clone();
+    tokenizer.go(|t, c| data(t, c, copy), |t, c| before_marker(t, c, markers))(tokenizer, code)
 }
-- 
cgit