Add text content type

*   Add character reference and character escapes in text
*   Add recursive subtokenization

1 files changed, 80 insertions, 0 deletions

diff --git a/src/content/text.rs b/src/content/text.rs
new file mode 100644
index 0000000..2c93b18
--- /dev/null
+++ b/src/content/text.rs
@@ -0,0 +1,80 @@
+//! The text content type.
+//!
+//! **Text** contains phrasing content such as attention (emphasis, strong),
+//! media (links, images), and actual text.
+//!
+//! The constructs found in text are:
+//!
+//! *   Autolink
+//! *   Attention
+//! *   HTML (text)
+//! *   Hard break escape
+//! *   Code (text)
+//! *   Line ending
+//! *   Label start (image)
+//! *   Label start (link)
+//! *   [Character escape][crate::construct::character_escape]
+//! *   [Character reference][crate::construct::character_reference]
+
+use crate::construct::{
+    character_escape::start as character_escape, character_reference::start as character_reference,
+};
+use crate::tokenizer::{Code, State, StateFnResult, TokenType, Tokenizer};
+
+/// Before text.
+///
+/// First we assume character reference.
+///
+/// ```markdown
+/// |&
+/// |\&
+/// |qwe
+/// ```
+pub fn start(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
+    match code {
+        Code::None => (State::Ok, None),
+        _ => tokenizer.attempt_2(character_reference, character_escape, |ok| {
+            Box::new(if ok { start } else { before_data })
+        })(tokenizer, code),
+    }
+}
+
+/// Before text.
+///
+/// We’re at data.
+///
+/// ```markdown
+/// |qwe
+/// ```
+fn before_data(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
+    if let Code::None = code {
+        (State::Ok, None)
+    } else {
+        tokenizer.enter(TokenType::Data);
+        tokenizer.consume(code);
+        (State::Fn(Box::new(in_data)), None)
+    }
+}
+
+/// In data.
+///
+/// ```markdown
+/// q|w|e
+/// ```
+fn in_data(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
+    match code {
+        Code::None => {
+            tokenizer.exit(TokenType::Data);
+            (State::Ok, None)
+        }
+        // To do: somehow get these markers from constructs.
+        Code::Char('&' | '\\') => {
+            tokenizer.exit(TokenType::Data);
+            start(tokenizer, code)
+        }
+        _ => {
+            tokenizer.consume(code);
+            (State::Fn(Box::new(in_data)), None)
+        }
+    }
+}