Add basic support for block quotes

1 files changed, 58 insertions, 0 deletions

diff --git a/src/construct/block_quote.rs b/src/construct/block_quote.rs
new file mode 100644
index 0000000..cd5b872
--- /dev/null
+++ b/src/construct/block_quote.rs
@@ -0,0 +1,58 @@
+//! To do.
+
+use crate::constant::TAB_SIZE;
+use crate::construct::partial_space_or_tab::space_or_tab_min_max;
+use crate::tokenizer::{Code, State, StateFnResult, TokenType, Tokenizer};
+
+pub fn start(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
+    // To do: allow arbitrary when code (indented) is turned off.
+    tokenizer.go(space_or_tab_min_max(0, TAB_SIZE - 1), before)(tokenizer, code)
+}
+
+fn before(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
+    match code {
+        Code::Char('>') => {
+            tokenizer.enter(TokenType::BlockQuote);
+            cont_before(tokenizer, code)
+        }
+        _ => cont_before(tokenizer, code),
+    }
+}
+
+pub fn cont(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
+    // To do: allow arbitrary when code (indented) is turned off.
+    tokenizer.go(space_or_tab_min_max(0, TAB_SIZE - 1), cont_before)(tokenizer, code)
+}
+
+fn cont_before(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
+    match code {
+        Code::Char('>') => {
+            tokenizer.enter(TokenType::BlockQuotePrefix);
+            tokenizer.enter(TokenType::BlockQuoteMarker);
+            tokenizer.consume(code);
+            tokenizer.exit(TokenType::BlockQuoteMarker);
+            (State::Fn(Box::new(cont_after)), None)
+        }
+        _ => (State::Nok, None),
+    }
+}
+
+fn cont_after(tokenizer: &mut Tokenizer, code: Code) -> StateFnResult {
+    match code {
+        Code::VirtualSpace | Code::Char('\t' | ' ') => {
+            tokenizer.enter(TokenType::BlockQuotePrefixWhitespace);
+            tokenizer.consume(code);
+            tokenizer.exit(TokenType::BlockQuotePrefixWhitespace);
+            tokenizer.exit(TokenType::BlockQuotePrefix);
+            (State::Ok, None)
+        }
+        _ => {
+            tokenizer.exit(TokenType::BlockQuotePrefix);
+            (State::Ok, Some(vec![code]))
+        }
+    }
+}
+
+pub fn end() -> Vec<TokenType> {
+    vec![TokenType::BlockQuote]
+}