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parser: add checks for if statement

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This commit is contained in:
Swastik Baranwal 2020-01-11 17:51:35 +05:30 committed by Alexander Medvednikov
parent 06f581e146
commit e3db628d0c
1 changed files with 11 additions and 6 deletions
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17
vlib/compiler/if_match.v
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@ -18,7 +18,6 @@ fn (p mut Parser) match_statement(is_expr bool) string {
}
is_sum_type := typ in p.table.sum_types
mut sum_child_type := ''
// is it safe to use p.cgen.insert_before ???
tmp_var := p.get_tmp()
p.cgen.insert_before('$typ $tmp_var = $expr;')
@ -137,12 +136,13 @@ fn (p mut Parser) match_statement(is_expr bool) string {
sum_child_type = p.get_type2().name
tt := sum_child_type.all_after('_')
p.gen('SumType_$tt')
//println('got child $sum_child_type')
// println('got child $sum_child_type')
p.register_var(Var{
name: 'it'
typ: sum_child_type
})
} else {
}
else {
p.check_types(p.bool_expression(), typ)
}
p.expected_type = ''
@ -221,6 +221,12 @@ fn (p mut Parser) if_statement(is_expr bool, elif_depth int) string {
}
p.next()
p.fspace()
if p.tok == .name && p.peek() == .assign {
p.error('cannot assign on if-else statement')
}
if p.tok == .name && (p.peek() == .inc || p.peek() == .dec) {
p.error('`${p.peek().str()}` is a statement')
}
// `if a := opt() { }` syntax
if p.tok == .name && p.peek() == .decl_assign {
p.check_not_reserved()
@ -255,12 +261,12 @@ fn (p mut Parser) if_statement(is_expr bool, elif_depth int) string {
name: var_name
typ: typ
is_mut: false // TODO
is_used: true // TODO
// is_alloc: p.is_alloc || typ.starts_with('array_')
// line_nr: p.tokens[ var_token_idx ].line_nr
// token_idx: var_token_idx
})
p.statements()
p.close_scope()
@ -352,4 +358,3 @@ fn (p mut Parser) if_statement(is_expr bool, elif_depth int) string {
}
return typ
}