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Record Pattern

This commit is contained in:
greg 2018-07-13 21:21:27 -07:00
parent 8aa33d0872
commit 5ecd298e6a
1 changed files with 26 additions and 2 deletions
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28
schala-lang/src/parsing.rs
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@ -114,7 +114,7 @@ pattern := '(' (pattern, ',')* ')' | simple_pattern
simple_pattern := pattern_literal | record_pattern | tuple_struct_pattern
pattern_literal := 'true' | 'false' | number_literal | STR_LITERAL | IDENTIFIER
record_pattern := IDENTIFIER '{' (record_pattern_entry, ',')* '}'
record_pattern_entry := ???
record_pattern_entry := IDENTIFIER | IDENTIFIER ':' Pattern
tuple_struct_pattern := IDENTIFIER '(' (pattern, ',')* ')'
/* Expression - If */
@ -751,7 +751,15 @@ impl Parser {
});
parse_method!(record_pattern_entry(&mut self) -> ParseResult<(Rc<String>, Pattern)> {
unimplemented!()
let name = self.identifier()?;
Ok(match self.peek() {
Colon => {
expect!(self, Colon);
let pat = self.pattern()?;
(name, pat)
},
_ => (name.clone(), Pattern::Literal(PatternLiteral::StringPattern(name.clone())))
})
});
parse_method!(block(&mut self) -> ParseResult<Block> {
@ -1420,5 +1428,21 @@ fn a(x) {
)
])
}
parse_test! {
"if x is Something { a, b: x } then { 4 } else { 9 }", AST(vec![
exprstatement!(
IfExpression {
discriminator: bx!(Discriminator::Simple(ex!(Value(rc!(x))))),
body: bx!(IfExpressionBody::SimplePatternMatch(
Pattern::Record(rc!(Something), vec![
(rc!(a),Pattern::Literal(PatternLiteral::StringPattern(rc!(a)))),
(rc!(b),Pattern::Literal(PatternLiteral::VarPattern(rc!(x))))
]),
vec![exprstatement!(NatLiteral(4))], Some(vec![exprstatement!(NatLiteral(9))])))
}
)
])
}
}
}