Alter grammar of if-blocks

schala-lang/language/src/parsing.rs

@@ -113,19 +113,26 @@
 //! record_pattern_entry := IDENTIFIER | IDENTIFIER ":" Pattern
 //! tuple_struct_pattern := qualified_identifier "(" (pattern, ",")* ")"
 //! ```
+//! ### If expressions
+//!
+//! TODO: it would be nice if the grammar could capture an incomplete precedence expr in the
+//! discriminator
 //!
-//! ### If-expressions
 //! ```text
-//! if_expr := "if" discriminator ("then" condititional | "is" simple_pattern_match | guard_block)
+//! if_expr := "if" discriminator ("then" simple_conditional | "is" simple_pattern_match | cond_block)
-//! discriminator := precedence_expr (operator)+
+//! discriminator := ε | expression
-//! conditional := expr_or_block else_clause
+//! simple_conditional := expr_or_block else_clause
-//! simple_pattern_match := pattern "then" conditional
+//! simple_pattern_match := pattern "then" simple_conditional
-//! else_clause := ε | "else" expr_or_block
+//! else_clause := "else" expr_or_block
-//! guard_block := "{" (guard_arm, ",")* "}"
+//!
-//! guard_arm := guard "then" expr_or_block | "else" expr_or_block
+//! cond_block := "{" (cond_arm comma_or_delimiter)* "}"
-//! guard := "is" pattern | (operator)+ precedence_expr
+//! cond_arm := condition guard "then" expr_or_block
+//! condition := "is" pattern | operator precedence_expr | expression
+//! guard := "if" expression
+//! comma_or_delimiter := "," | delimiter
 //! ```
 //!
+//!
 //! ### While expressions
 //! ```text
 //! while_expr := "while" while_cond "{" (statement delimiter)* "}"