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package json
import "core:mem"
// NOTE(bill): is_valid will not check for duplicate keys
is_valid :: proc(data: []byte, spec := Specification.JSON) -> bool {
p := make_parser(data, spec, mem.nil_allocator());
if p.spec == Specification.JSON5 {
return validate_value(&p);
}
return validate_object(&p);
}
validate_object_key :: proc(p: ^Parser) -> bool {
tok := p.curr_token;
if p.spec == Specification.JSON5 {
if tok.kind == .String {
expect_token(p, .String);
return true;
} else if tok.kind == .Ident {
expect_token(p, .Ident);
return true;
}
}
err := expect_token(p, .String);
return err == Error.None;
}
validate_object :: proc(p: ^Parser) -> bool {
if err := expect_token(p, .Open_Brace); err != Error.None {
return false;
}
for p.curr_token.kind != .Close_Brace {
if !validate_object_key(p) {
return false;
}
if colon_err := expect_token(p, .Colon); colon_err != Error.None {
return false;
}
if !validate_value(p) {
return false;
}
if p.spec == Specification.JSON5 {
// Allow trailing commas
if allow_token(p, .Comma) {
continue;
}
} else {
// Disallow trailing commas
if allow_token(p, .Comma) {
continue;
} else {
break;
}
}
}
if err := expect_token(p, .Close_Brace); err != Error.None {
return false;
}
return true;
}
validate_array :: proc(p: ^Parser) -> bool {
if err := expect_token(p, .Open_Bracket); err != Error.None {
return false;
}
for p.curr_token.kind != .Close_Bracket {
if !validate_value(p) {
return false;
}
// Disallow trailing commas for the time being
if allow_token(p, .Comma) {
continue;
} else {
break;
}
}
if err := expect_token(p, .Close_Bracket); err != Error.None {
return false;
}
return true;
}
validate_value :: proc(p: ^Parser) -> bool {
token := p.curr_token;
#partial switch token.kind {
case .Null, .False, .True:
advance_token(p);
return true;
case .Integer, .Float:
advance_token(p);
return true;
case .String:
advance_token(p);
return is_valid_string_literal(token.text, p.spec);
case .Open_Brace:
return validate_object(p);
case .Open_Bracket:
return validate_array(p);
case:
if p.spec == Specification.JSON5 {
#partial switch token.kind {
case .Infinity, .NaN:
advance_token(p);
return true;
}
}
}
return false;
}
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