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boolean-type from comparisons

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uan
2026-02-04 18:06:51 +01:00
parent 6525fa711d
commit fc79c23b77
4 changed files with 42 additions and 16 deletions
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26
parser.v
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@@ -213,11 +213,9 @@ fn (mut p Parser) parse_expr() Expr {
mut left := p.parse_primary()
match p.peek().type {
.plus {return p.parse_binary(left, '+')}
.minus {return p.parse_binary(left, '-')}
.star {return p.parse_binary(left, '*')}
.slash {return p.parse_binary(left, '/')}
.equals {return p.parse_binary(left, '=')}
.plus, .minus, .star, .slash, .equals, .eq_eq, .not_eq, .less_eq, .greater_eq {
return p.parse_binary(left, p.peek().text)
}
else {return left}
}
}
@@ -226,8 +224,8 @@ fn (mut p Parser) parse_binary(left Expr, op string) BinaryExpr {
p.next()
right := p.parse_expr()
binary_expr := BinaryExpr{left, op, right}
if !p.is_op_valid_for_type(p.get_expr_type(binary_expr), op) {
parse_error("Illegal operation ${op} for type ${p.get_expr_type(binary_expr)}")
if !p.is_op_valid_for_type(p.get_expr_type(left), op) {
parse_error("Illegal operation ${op} for type ${p.get_expr_type(left)}")
}
return binary_expr
}
@@ -267,7 +265,11 @@ fn (mut p Parser) get_expr_type(expr Expr) string {
if left_t != right_t {
parse_error ('Type mismatch in expression: ${left_t} and ${right_t}')
}
left_t
if expr.op in ['<=', '==', '>=', '!='] {
'bool'
} else {
left_t
}
}
Variable {
p.dump_stmt()
@@ -284,12 +286,14 @@ fn (mut p Parser) get_expr_type(expr Expr) string {
}
fn (mut p Parser) is_op_valid_for_type(type string, op string) bool {
legal_ops := match type {
'int' {['+', '-', '*', '/', '<', '>', '=']}
'real' {['+', '-', '*', '/', '<', '>', '=']}
global := ['=', '==', '!=']
mut legal_ops := match type {
'int' {['+', '-', '*', '/', '<', '>', '<=', '>=',]}
'real' {['+', '-', '*', '/', '<', '>', '<=', '>=']}
'bool' {['=']}
else {[]}
}
legal_ops << global
return op in legal_ops
}