blob: bfde3c7581463cfb6596959ce19fd2950b8b6933 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
#include <mbgl/style/expression/coalesce.hpp>
namespace mbgl {
namespace style {
namespace expression {
EvaluationResult Coalesce::evaluate(const EvaluationContext& params) const {
EvaluationResult result = Null;
for (const auto& arg : args) {
result = arg->evaluate(params);
if (!result || *result != Null) break;
}
return result;
}
void Coalesce::eachChild(const std::function<void(const Expression&)>& visit) const {
for (const std::unique_ptr<Expression>& arg : args) {
visit(*arg);
}
}
bool Coalesce::operator==(const Expression& e) const {
if (auto rhs = dynamic_cast<const Coalesce*>(&e)) {
return Expression::childrenEqual(args, rhs->args);
}
return false;
}
using namespace mbgl::style::conversion;
ParseResult Coalesce::parse(const Convertible& value, ParsingContext& ctx) {
assert(isArray(value));
auto length = arrayLength(value);
if (length < 2) {
ctx.error("Expected at least one argument.");
return ParseResult();
}
optional<type::Type> outputType;
if (ctx.getExpected() && *ctx.getExpected() != type::Value) {
outputType = ctx.getExpected();
}
Coalesce::Args args;
args.reserve(length - 1);
for (std::size_t i = 1; i < length; i++) {
auto parsed = ctx.parse(arrayMember(value, i), i, outputType);
if (!parsed) {
return parsed;
}
if (!outputType) {
outputType = (*parsed)->getType();
}
args.push_back(std::move(*parsed));
}
assert(outputType);
return ParseResult(std::make_unique<Coalesce>(*outputType, std::move(args)));
}
} // namespace expression
} // namespace style
} // namespace mbgl
|
