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Beginning for expressions

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This commit is contained in:
greg 2017-10-08 22:02:58 -07:00
parent 4032707dc9
commit 5cb8423ecc
1 changed files with 10 additions and 2 deletions
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12
src/schala_lang/parsing.rs
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@ -289,7 +289,7 @@ expression := precedence_expr type_anno+
precedence_expr := prefix_expr
prefix_expr := prefix_op primary
prefix_op := '+' | '-' | '!' | '~'
primary := literal | paren_expr | if_expr | match_expr | identifier_expr
primary := literal | paren_expr | if_expr | match_expr | for_expr | identifier_expr
paren_expr := LParen paren_inner RParen
paren_inner := (expression ',')*
@ -310,6 +310,7 @@ call_expr := IDENTIFIER '(' expr_list ')' //TODO maybe make this optional? or no
index_expr := '[' (expression (',' (expression)* | ε) ']'
expr_list := expression (',' expression)* | ε
for_expr := 'for' ... ????
// a float_literal can still be assigned to an int in type-checking
number_literal := int_literal | float_literal
@ -451,7 +452,8 @@ pub enum ExpressionType {
indexers: Vec<Expression>,
},
IfExpression(Box<Expression>, Vec<Statement>, Option<Vec<Statement>>),
MatchExpression(Box<Expression>, Vec<MatchArm>)
MatchExpression(Box<Expression>, Vec<MatchArm>),
ForExpression
}
#[derive(Debug, PartialEq, Clone)]
@ -787,6 +789,7 @@ impl Parser {
LParen => self.paren_expr(),
Keyword(Kw::If) => self.if_expr(),
Keyword(Kw::Match) => self.match_expr(),
Keyword(Kw::For) => self.for_expr(),
Identifier(_) => self.identifier_expr(),
_ => self.literal(),
}
@ -879,6 +882,11 @@ impl Parser {
Ok(Pattern(identifier))
});
parse_method!(for_expr(&mut self) -> ParseResult<Expression> {
expect!(self, Keyword(Kw::For), "'for'");
Ok(Expression(ExpressionType::ForExpression, None))
});
parse_method!(identifier(&mut self) -> ParseResult<Rc<String>> {
match self.next() {
Identifier(s) => Ok(s),