Make data a construct

1 files changed, 69 insertions, 0 deletions

diff --git a/src/construct/partial_data.rs b/src/construct/partial_data.rs
new file mode 100644
index 0000000..d83787a
--- /dev/null
+++ b/src/construct/partial_data.rs
@@ -0,0 +1,69 @@
+//! Data occurs in [text][] and [string][].
+//!
+//! It can include anything (including line endings), and stops at certain
+//! characters.
+//!
+//! [string]: crate::content::string
+//! [text]: crate::content::text
+
+// To do: pass token types in?
+
+use crate::tokenizer::{Code, State, StateFnResult, TokenType, Tokenizer};
+
+/// At the beginning of data.
+///
+/// ```markdown
+/// |&qwe
+/// ```
+pub fn start(tokenizer: &mut Tokenizer, code: Code, stop: Vec<Code>) -> StateFnResult {
+    if stop.contains(&code) {
+        tokenizer.enter(TokenType::Data);
+        tokenizer.consume(code);
+        (State::Fn(Box::new(|t, c| data(t, c, stop))), None)
+    } else {
+        at_break(tokenizer, code, stop)
+    }
+}
+
+/// Before something.
+///
+/// ```markdown
+/// |qwe| |&
+/// ```
+fn at_break(tokenizer: &mut Tokenizer, code: Code, stop: Vec<Code>) -> StateFnResult {
+    match code {
+        Code::None => (State::Ok, None),
+        Code::CarriageReturnLineFeed | Code::Char('\r' | '\n') => {
+            tokenizer.enter(TokenType::LineEnding);
+            tokenizer.consume(code);
+            tokenizer.exit(TokenType::LineEnding);
+            (State::Fn(Box::new(|t, c| at_break(t, c, stop))), None)
+        }
+        _ if stop.contains(&code) => (State::Ok, Some(vec![code])),
+        _ => {
+            tokenizer.enter(TokenType::Data);
+            data(tokenizer, code, stop)
+        }
+    }
+}
+
+/// In data.
+///
+/// ```markdown
+/// q|w|e
+/// ```
+fn data(tokenizer: &mut Tokenizer, code: Code, stop: Vec<Code>) -> StateFnResult {
+    let done = match code {
+        Code::None | Code::CarriageReturnLineFeed | Code::Char('\r' | '\n') => true,
+        _ if stop.contains(&code) => true,
+        _ => false,
+    };
+
+    if done {
+        tokenizer.exit(TokenType::Data);
+        at_break(tokenizer, code, stop)
+    } else {
+        tokenizer.consume(code);
+        (State::Fn(Box::new(|t, c| data(t, c, stop))), None)
+    }
+}