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Diffstat (limited to 'src/mbgl/style/expression/assertion.cpp')
-rw-r--r-- | src/mbgl/style/expression/assertion.cpp | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/src/mbgl/style/expression/assertion.cpp b/src/mbgl/style/expression/assertion.cpp new file mode 100644 index 0000000000..a17c53cf54 --- /dev/null +++ b/src/mbgl/style/expression/assertion.cpp @@ -0,0 +1,73 @@ +#include <mbgl/style/expression/assertion.hpp> +#include <mbgl/style/expression/check_subtype.hpp> + +namespace mbgl { +namespace style { +namespace expression { + +using namespace mbgl::style::conversion; +ParseResult Assertion::parse(const Convertible& value, ParsingContext& ctx) { + static std::unordered_map<std::string, type::Type> types { + {"string", type::String}, + {"number", type::Number}, + {"boolean", type::Boolean}, + {"object", type::Object} + }; + + std::size_t length = arrayLength(value); + + if (length < 2) { + ctx.error("Expected at least one argument."); + return ParseResult(); + } + + auto it = types.find(*toString(arrayMember(value, 0))); + assert(it != types.end()); + + std::vector<std::unique_ptr<Expression>> parsed; + parsed.reserve(length - 1); + for (std::size_t i = 1; i < length; i++) { + ParseResult input = ctx.parse(arrayMember(value, i), i, {type::Value}); + if (!input) return ParseResult(); + parsed.push_back(std::move(*input)); + } + + return ParseResult(std::make_unique<Assertion>(it->second, std::move(parsed))); +} + +EvaluationResult Assertion::evaluate(const EvaluationContext& params) const { + for (std::size_t i = 0; i < inputs.size(); i++) { + EvaluationResult value = inputs[i]->evaluate(params); + if (!value) return value; + if (!type::checkSubtype(getType(), typeOf(*value))) { + return value; + } else if (i == inputs.size() - 1) { + return EvaluationError { + "Expected value to be of type " + toString(getType()) + + ", but found " + toString(typeOf(*value)) + " instead." + }; + } + } + + assert(false); + return EvaluationError { "Unreachable" }; +}; + +void Assertion::eachChild(const std::function<void(const Expression&)>& visit) const { + for(const std::unique_ptr<Expression>& input : inputs) { + visit(*input); + } +}; + +bool Assertion::operator==(const Expression& e) const { + if (auto rhs = dynamic_cast<const Assertion*>(&e)) { + return getType() == rhs->getType() && Expression::childrenEqual(inputs, rhs->inputs); + } + return false; +} + +} // namespace expression +} // namespace style +} // namespace mbgl + + |