| 1 | #pragma once |
|---|---|
| 2 | |
| 3 | #include <mbgl/style/property_value.hpp> |
| 4 | #include <mbgl/style/conversion.hpp> |
| 5 | #include <mbgl/style/conversion/constant.hpp> |
| 6 | #include <mbgl/style/conversion/function.hpp> |
| 7 | #include <mbgl/style/expression/value.hpp> |
| 8 | #include <mbgl/style/expression/is_constant.hpp> |
| 9 | #include <mbgl/style/expression/is_expression.hpp> |
| 10 | #include <mbgl/style/expression/parsing_context.hpp> |
| 11 | #include <mbgl/style/expression/literal.hpp> |
| 12 | |
| 13 | namespace mbgl { |
| 14 | namespace style { |
| 15 | namespace conversion { |
| 16 | |
| 17 | template <class T> |
| 18 | struct Converter<PropertyValue<T>> { |
| 19 | optional<PropertyValue<T>> operator()(const Convertible& value, Error& error, bool convertTokens = false) const { |
| 20 | using namespace mbgl::style::expression; |
| 21 | |
| 22 | // Only icon-image and text-field support tokens, and they are both data-driven. |
| 23 | assert(!convertTokens); |
| 24 | (void)convertTokens; |
| 25 | |
| 26 | if (isUndefined(v: value)) { |
| 27 | return PropertyValue<T>(); |
| 28 | } |
| 29 | |
| 30 | optional<PropertyExpression<T>> expression; |
| 31 | |
| 32 | if (isExpression(value)) { |
| 33 | ParsingContext ctx(valueTypeToExpressionType<T>()); |
| 34 | ParseResult parsed = ctx.parseLayerPropertyExpression(value); |
| 35 | if (!parsed) { |
| 36 | error = { .message: ctx.getCombinedErrors() }; |
| 37 | return {}; |
| 38 | } |
| 39 | expression = PropertyExpression<T>(std::move(*parsed)); |
| 40 | } else if (isObject(v: value)) { |
| 41 | expression = convertFunctionToExpression<T>(value, error, false); |
| 42 | } else { |
| 43 | optional<T> constant = convert<T>(value, error); |
| 44 | if (!constant) { |
| 45 | return {}; |
| 46 | } |
| 47 | return { *constant }; |
| 48 | } |
| 49 | |
| 50 | if (!expression) { |
| 51 | return {}; |
| 52 | } else if (!(*expression).isFeatureConstant()) { |
| 53 | error = { .message: "data expressions not supported"}; |
| 54 | return {}; |
| 55 | } else if (!(*expression).isZoomConstant()) { |
| 56 | return { std::move(*expression) }; |
| 57 | } else if ((*expression).getExpression().getKind() == Kind::Literal) { |
| 58 | optional<T> constant = fromExpressionValue<T>( |
| 59 | static_cast<const Literal&>((*expression).getExpression()).getValue()); |
| 60 | if (!constant) { |
| 61 | return {}; |
| 62 | } |
| 63 | return PropertyValue<T>(*constant); |
| 64 | } else { |
| 65 | assert(false); |
| 66 | error = { .message: "expected a literal expression"}; |
| 67 | return {}; |
| 68 | } |
| 69 | } |
| 70 | }; |
| 71 | |
| 72 | } // namespace conversion |
| 73 | } // namespace style |
| 74 | } // namespace mbgl |
| 75 |