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#include <mbgl/style/conversion_impl.hpp>
#include <mbgl/style/expression/format_expression.hpp>
#include <mbgl/style/expression/literal.hpp>
#include <mbgl/util/font_stack.hpp>
#include <mbgl/util/string.hpp>
namespace mbgl {
namespace style {
namespace expression {
FormatExpressionSection::FormatExpressionSection(std::unique_ptr<Expression> text_,
optional<std::unique_ptr<Expression>> fontScale_,
optional<std::unique_ptr<Expression>> textFont_)
: text(std::move(text_))
{
if (fontScale_) {
fontScale = std::shared_ptr<Expression>(std::move(*fontScale_));
}
if (textFont_) {
textFont = std::shared_ptr<Expression>(std::move(*textFont_));
}
}
FormatExpression::FormatExpression(std::vector<FormatExpressionSection> sections_)
: Expression(Kind::FormatExpression, type::Formatted)
, sections(std::move(sections_))
{}
using namespace mbgl::style::conversion;
ParseResult FormatExpression::parse(const Convertible& value, ParsingContext& ctx) {
std::size_t argsLength = arrayLength(value);
if (argsLength < 3) {
ctx.error("Expected at least two arguments.");
return ParseResult();
}
if ((argsLength - 1) % 2 != 0) {
ctx.error("Expected an even number of arguments.");
return ParseResult();
}
std::vector<FormatExpressionSection> sections;
for (std::size_t i = 1; i < argsLength - 1; i += 2) {
auto textArg = arrayMember(value, i);
ParseResult text = ctx.parse(textArg, 1, {type::Value});
if (!text) {
return ParseResult();
}
auto options = arrayMember(value, i + 1);
if (!isObject(options)) {
ctx.error("Format options argument must be an object.");
return ParseResult();
}
const optional<Convertible> fontScaleOption = objectMember(options, "font-scale");
ParseResult fontScale;
if (fontScaleOption) {
fontScale = ctx.parse(*fontScaleOption, 1, {type::Number});
if (!fontScale) {
return ParseResult();
}
}
const optional<Convertible> textFontOption = objectMember(options, "text-font");
ParseResult textFont;
if (textFontOption) {
textFont = ctx.parse(*textFontOption, 1, {type::Array(type::String)});
if (!textFont) {
return ParseResult();
}
}
sections.emplace_back(std::move(*text), std::move(fontScale), std::move(textFont));
}
return ParseResult(std::make_unique<FormatExpression>(std::move(sections)));
}
void FormatExpression::eachChild(const std::function<void(const Expression&)>& fn) const {
for (auto& section : sections) {
fn(*section.text);
if (section.fontScale) {
fn(**section.fontScale);
}
if (section.textFont) {
fn(**section.textFont);
}
}
}
bool FormatExpression::operator==(const Expression& e) const {
if (e.getKind() == Kind::FormatExpression) {
auto rhs = static_cast<const FormatExpression*>(&e);
if (sections.size() != rhs->sections.size()) {
return false;
}
for (std::size_t i = 0; i < sections.size(); i++) {
const auto& lhsSection = sections.at(i);
const auto& rhsSection = rhs->sections.at(i);
if (*lhsSection.text != *rhsSection.text) {
return false;
}
if ((lhsSection.fontScale && (!rhsSection.fontScale || **lhsSection.fontScale != **rhsSection.fontScale)) ||
(!lhsSection.fontScale && rhsSection.fontScale)) {
return false;
}
if ((lhsSection.textFont && (!rhsSection.textFont || **lhsSection.textFont != **rhsSection.textFont)) ||
(!lhsSection.textFont && rhsSection.textFont)) {
return false;
}
}
return true;
}
return false;
}
mbgl::Value FormatExpression::serialize() const {
std::vector<mbgl::Value> serialized{{ std::string("format") }};
for (const auto& section : sections) {
serialized.push_back(section.text->serialize());
std::unordered_map<std::string, mbgl::Value> options;
if (section.fontScale) {
options.emplace("font-scale", (*section.fontScale)->serialize());
}
if (section.textFont) {
options.emplace("text-font", (*section.textFont)->serialize());
}
serialized.push_back(options);
}
return serialized;
}
EvaluationResult FormatExpression::evaluate(const EvaluationContext& params) const {
std::vector<FormattedSection> evaluatedSections;
for (const auto& section : sections) {
auto textResult = section.text->evaluate(params);
if (!textResult) {
return textResult.error();
}
optional<std::string> evaluatedText = toString(*textResult);
if (!evaluatedText) {
return EvaluationError({ "Could not coerce format expression text input to string." });
}
optional<double> evaluatedFontScale;
if (section.fontScale) {
auto fontScaleResult = (*section.fontScale)->evaluate(params);
if (!fontScaleResult) {
return fontScaleResult.error();
}
evaluatedFontScale = fontScaleResult->get<double>();
}
optional<FontStack> evaluatedTextFont;
if (section.textFont) {
auto textFontResult = (*section.textFont)->evaluate(params);
if (!textFontResult) {
return textFontResult.error();
}
auto textFontValue = ValueConverter<std::vector<std::string>>::fromExpressionValue(*textFontResult);
if (!textFontValue) {
return EvaluationError { "Format text-font option must evaluate to an array of strings" };
}
evaluatedTextFont = *textFontValue;
}
evaluatedSections.emplace_back(*evaluatedText, evaluatedFontScale, evaluatedTextFont);
}
return Formatted(evaluatedSections);
}
} // namespace expression
} // namespace style
} // namespace mbgl
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