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#pragma once
#include <vector>
#include <memory>
#include <mbgl/style/expression/coalesce.hpp>
#include <mbgl/style/expression/parsing_context.hpp>
#include <mbgl/style/expression/type.hpp>
#include <mbgl/style/conversion.hpp>
namespace mbgl {
namespace style {
namespace expression {
struct ParseCoalesce {
static ParseResult parse(const mbgl::style::conversion::Value& value, ParsingContext ctx) {
using namespace mbgl::style::conversion;
assert(isArray(value));
auto length = arrayLength(value);
if (length < 2) {
ctx.error("Expected at least one argument.");
return ParseResult();
}
Coalesce::Args args;
optional<type::Type> outputType;
if (ctx.expected && *ctx.expected != type::Value) {
outputType = ctx.expected;
}
for (std::size_t i = 1; i < length; i++) {
auto parsed = parseExpression(arrayMember(value, i), ParsingContext(ctx, 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
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