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#include <mbgl/style/conversion/filter.hpp>
#include <mbgl/style/expression/literal.hpp>
#include <mbgl/util/geometry.hpp>
#include <mbgl/style/expression/expression.hpp>
#include <mbgl/style/expression/type.hpp>
#include <mbgl/style/expression/compound_expression.hpp>
namespace mbgl {
namespace style {
namespace conversion {
// TODO factor this out
using namespace mbgl::style::expression;
using GeometryValue = mapbox::geometry::value;
// This is a port from https://github.com/mapbox/mapbox-gl-js/blob/master/src/style-spec/feature_filter/index.js
static bool isExpressionFilter(const Convertible& filter) {
if (!isArray(filter) || arrayLength(filter) == 0) {
return false;
}
optional<std::string> op = toString(arrayMember(filter, 0));
if (!op) {
return false;
} else if (*op == "has") {
if (arrayLength(filter) < 2) return false;
optional<std::string> operand = toString(arrayMember(filter, 1));
return operand && *operand != "$id" && *operand != "$type";
} else if (*op == "in" || *op == "!in" || *op == "!has" || *op == "none") {
return false;
} else if (*op == "==" || *op == "!=" || *op == ">" || *op == ">=" || *op == "<" || *op == "<=") {
return arrayLength(filter) == 3 && (isArray(arrayMember(filter, 1)) || isArray(arrayMember(filter, 2)));
} else if (*op == "any" || *op == "all") {
for (std::size_t i = 1; i < arrayLength(filter); i++) {
Convertible f = arrayMember(filter, i);
if (!isExpressionFilter(f) && !toBool(f)) {
return false;
}
}
return true;
} else {
return true;
}
}
static bool isLegacyFilter(const Convertible& filter) {
return !isExpressionFilter(filter);
}
std::unique_ptr<Expression> convertibleToLiteralExpression(const Convertible& value) {
// TODO handle null case
return std::make_unique<Literal>(toExpressionValue(*toValue(value)));
}
std::vector<std::unique_ptr<Expression>> createLiteralExpressionArray(const Convertible &input, std::size_t startIndex = 0) {
std::vector<std::unique_ptr<Expression>> output(arrayLength(input) - startIndex);
for (std::size_t i = startIndex; i < arrayLength(input); i++) {
output.push_back(convertibleToLiteralExpression(arrayMember(input, i)));
}
return output;
}
std::unique_ptr<Expression> createExpression(std::string op, std::vector<std::unique_ptr<Expression>> args) {
ParsingContext context;
ParseResult parseResult = createCompoundExpression(op, std::move(args), context);
assert(parseResult);
assert(context.getErrors().size() == 0);
return std::move(*parseResult);
}
std::unique_ptr<Expression> convertLegacyFilter2(const Convertible& values, Error& error);
std::vector<std::unique_ptr<Expression>> createLegacyFilter2Array(const Convertible &input, Error& error, std::size_t startIndex = 0) {
std::vector<std::unique_ptr<Expression>> output(arrayLength(input) - startIndex);
for (std::size_t i = startIndex; i < arrayLength(input); i++) {
output.push_back(convertLegacyFilter2(arrayMember(input, i), error));
}
return output;
}
std::unique_ptr<Expression> convertLegacyFilter(const Convertible& value, Error& error) {
if (!isArray(value)) {
return convertibleToLiteralExpression(value);
} else {
if (arrayLength(value) < 1) {
error = { "filter expression must have at least 1 element" };
return {};
}
optional<std::string> inputOperator = toString(arrayMember(value, 0));
if (!inputOperator) {
error = { "filter operator must be a string" };
return {};
}
std::string outputOperator;
if (*inputOperator == "==") {
outputOperator = "filter-==";
} else {
error = { R"(filter operator must be one of "==", "!=", ">", ">=", "<", "<=", "in", "!in", "all", "any", "none", "has", or "!has")" };
return {};
}
std::vector<std::unique_ptr<Expression>> args;
for (std::size_t i = 1; i < arrayLength(value); i++) {
args.push_back(convertLegacyFilter(arrayMember(value, i), error));
}
ParsingContext context;
ParseResult parseResult = createCompoundExpression(outputOperator, std::move(args), context);
assert(parseResult);
assert(context.getErrors().size() == 0);
return std::move(*parseResult);
}
}
optional<Filter> Converter<Filter>::operator()(const Convertible& value, Error& error) const {
optional<std::unique_ptr<Expression>> expression;
if (isLegacyFilter(value)) {
expression = convertLegacyFilter(value, error);
} else {
expression::ParsingContext ctx(expression::type::Boolean);
expression::ParseResult parseResult = ctx.parseExpression(value);
if (!parseResult) {
error = { ctx.getCombinedErrors() };
return {};
}
expression = std::move(*parseResult);
}
if (!expression) return {};
return { ExpressionFilter { std::move(*expression) } };
}
std::unique_ptr<Expression> convertComparisonOp(const Convertible& values, Error& error) {
optional<std::string> op = toString(arrayMember(values, 0));
optional<std::string> property = toString(arrayMember(values, 1));
if (!property) {
error = { "filter property must be a string" };
return {};
} else if (*property == "$type") {
return createExpression("filter-type-" + *op, createLiteralExpressionArray(values, 2));
} else if (*property == "$id") {
return createExpression("filter-id-" + *op, createLiteralExpressionArray(values, 2));
} else {
return createExpression("filter-" + *op, createLiteralExpressionArray(values, 1));
}
}
std::unique_ptr<Expression> convertHasOp(std::string property) {
if (property == "$type") {
return std::make_unique<Literal>(true);
} else if (property == "$id") {
return createExpression("filter-has-id", {});
} else {
return createExpression("filter-has", { std::make_unique<Literal>(property) });
}
}
std::unique_ptr<Expression> convertNegation(std::unique_ptr<Expression> expression) {
return createExpression("!", { std::move(expression) });
}
std::unique_ptr<Expression> convertNegation(std::unique_ptr<Expression> expression, Error&) {
return convertNegation(std::move(expression));
}
std::unique_ptr<Expression> convertInOp(const Convertible& values, Error& error) {
optional<std::string> property = toString(arrayMember(values, 1));
if (!property) {
error = { "filter property must be a string" };
return {};
} else if (arrayLength(values) == 0) {
return std::make_unique<Literal>(false);
} else if (*property == "$type") {
return createExpression("filter-type-in", createLiteralExpressionArray(values, 2));
} else if (*property == "id") {
return createExpression("filter-id-in", createLiteralExpressionArray(values, 2));
} else {
return createExpression("filter-in", createLiteralExpressionArray(values, 1));
}
}
std::unique_ptr<Expression> convertLegacyFilter2(const Convertible& values, Error& error) {
if (isUndefined(values)) {
return std::make_unique<Literal>(true);
}
optional<std::string> op = toString(arrayMember(values, 0));
if (!op) {
error = { "filter operator must be a string" };
return {};
} else if (arrayLength(values) <= 1) {
return std::make_unique<Literal>(*op != "any");
} else {
return (
*op == "==" ? convertComparisonOp(values, error) :
*op == "!=" ? convertNegation(convertComparisonOp(values, error)) :
*op == "<" ||
*op == ">" ||
*op == "<=" ||
*op == ">=" ? convertComparisonOp(values, error) :
*op == "any" ? createExpression("any", createLegacyFilter2Array(values, error, 1)) :
*op == "all" ? createExpression("all", createLegacyFilter2Array(values, error, 1)) :
*op == "none" ? convertNegation(createExpression("any", createLegacyFilter2Array(values, error, 1))) :
*op == "in" ? convertInOp(values, error) :
*op == "!in" ? convertNegation(convertInOp(values, error)) :
*op == "has" ? convertHasOp(*toString(arrayMember(values, 1))) :
*op == "!has" ? convertNegation(convertHasOp(*toString(arrayMember(values, 1)))) :
std::make_unique<Literal>(true)
);
}
}
} // namespace conversion
} // namespace style
} // namespace mbgl
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