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#include <mbgl/style/filter_expression.hpp>
#include <mbgl/tile/geometry_tile.hpp>
#include <mbgl/platform/log.hpp>
namespace mbgl {
Value parseFeatureType(const Value& value) {
if (value == std::string("Point")) {
return Value(uint64_t(FeatureType::Point));
} else if (value == std::string("LineString")) {
return Value(uint64_t(FeatureType::LineString));
} else if (value == std::string("Polygon")) {
return Value(uint64_t(FeatureType::Polygon));
} else {
Log::Warning(Event::ParseStyle, "value for $type filter must be Point, LineString, or Polygon");
return Value(uint64_t(FeatureType::Unknown));
}
}
template <class Expression>
FilterExpression parseBinaryFilter(const JSValue& value) {
FilterExpression empty;
if (value.Size() < 3) {
Log::Warning(Event::ParseStyle, "filter expression must have 3 elements");
return empty;
}
if (!value[1u].IsString()) {
Log::Warning(Event::ParseStyle, "filter expression key must be a string");
return empty;
}
Expression expression;
expression.key = { value[1u].GetString(), value[1u].GetStringLength() };
expression.value = parseValue(value[2u]);
if (expression.key == "$type") {
expression.value = parseFeatureType(expression.value);
}
return expression;
}
template <class Expression>
FilterExpression parseSetFilter(const JSValue& value) {
FilterExpression empty;
if (value.Size() < 2) {
Log::Warning(Event::ParseStyle, "filter expression must at least 2 elements");
return empty;
}
if (!value[1u].IsString()) {
Log::Warning(Event::ParseStyle, "filter expression key must be a string");
return empty;
}
Expression expression;
expression.key = { value[1u].GetString(), value[1u].GetStringLength() };
for (rapidjson::SizeType i = 2; i < value.Size(); ++i) {
Value parsedValue = parseValue(value[i]);
if (expression.key == "$type") {
parsedValue = parseFeatureType(parsedValue);
}
expression.values.push_back(parsedValue);
}
return expression;
}
template <class Expression>
FilterExpression parseCompoundFilter(const JSValue& value) {
Expression expression;
for (rapidjson::SizeType i = 1; i < value.Size(); ++i) {
expression.expressions.push_back(parseFilterExpression(value[i]));
}
return expression;
}
FilterExpression parseFilterExpression(const JSValue& value) {
FilterExpression empty;
if (!value.IsArray()) {
Log::Warning(Event::ParseStyle, "filter expression must be an array");
return empty;
}
if (value.Size() < 1) {
Log::Warning(Event::ParseStyle, "filter expression must have at least 1 element");
return empty;
}
if (!value[0u].IsString()) {
Log::Warning(Event::ParseStyle, "filter operator must be a string");
return empty;
}
std::string op = { value[0u].GetString(), value[0u].GetStringLength() };
if (op == "==") {
return parseBinaryFilter<EqualsExpression>(value);
} else if (op == "!=") {
return parseBinaryFilter<NotEqualsExpression>(value);
} else if (op == ">") {
return parseBinaryFilter<GreaterThanExpression>(value);
} else if (op == ">=") {
return parseBinaryFilter<GreaterThanEqualsExpression>(value);
} else if (op == "<") {
return parseBinaryFilter<LessThanExpression>(value);
} else if (op == "<=") {
return parseBinaryFilter<LessThanEqualsExpression>(value);
} else if (op == "in") {
return parseSetFilter<InExpression>(value);
} else if (op == "!in") {
return parseSetFilter<NotInExpression>(value);
} else if (op == "all") {
return parseCompoundFilter<AllExpression>(value);
} else if (op == "any") {
return parseCompoundFilter<AnyExpression>(value);
} else if (op == "none") {
return parseCompoundFilter<NoneExpression>(value);
} else {
Log::Warning(Event::ParseStyle, "filter operator must be one of \"==\", \"!=\", \">\", \">=\", \"<\", \"<=\", \"in\", \"!in\", \"all\", \"any\", \"none\"");
return empty;
}
}
} // namespace mbgl
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