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force () in complex bool expressions: (a && b) || c instead of a && b || c

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This commit is contained in:
Alexander Medvednikov
2019-08-04 10:18:31 +02:00
parent 58117f1312
commit 350e13679c
7 changed files with 33 additions and 9 deletions
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15
compiler/parser.v
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@@ -1312,10 +1312,25 @@ fn (p mut Parser) var_decl() {
p.var_decl_name = ''
}
const (
and_or_error = 'use `()` to make the boolean expression clear\n' +
'for example: `(a && b) || c` instead of `a && b || c`'
)
fn (p mut Parser) bool_expression() string {
tok := p.tok
typ := p.bterm()
mut got_and := false // to catch `a && b || c` in one expression without ()
mut got_or := false
for p.tok == .and || p.tok == .logical_or {
if p.tok == .and {
got_and = true
if got_or { p.error(and_or_error) }
}
if p.tok == .logical_or {
got_or = true
if got_and { p.error(and_or_error) }
}
p.gen(' ${p.tok.str()} ')
p.check_space(p.tok)
p.check_types(p.bterm(), typ)