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#include <mbgl/style/conversion_impl.hpp>
#include <mbgl/style/expression/format_expression.hpp>
#include <mbgl/style/expression/formatted.hpp>
namespace mbgl {
namespace style {
namespace expression {
FormatExpressionSection::FormatExpressionSection(std::unique_ptr<Expression> content_) : content(std::move(content_)) {}
void FormatExpressionSection::setTextSectionOptions(optional<std::unique_ptr<Expression>> fontScale_,
optional<std::unique_ptr<Expression>> textFont_,
optional<std::unique_ptr<Expression>> textColor_) {
if (fontScale_) {
assert(*fontScale_);
fontScale = std::shared_ptr<Expression>(std::move(*fontScale_));
}
if (textFont_) {
assert(*textFont_);
textFont = std::shared_ptr<Expression>(std::move(*textFont_));
}
if (textColor_) {
assert(*textColor_);
textColor = std::shared_ptr<Expression>(std::move(*textColor_));
}
}
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 < 2) {
ctx.error("Expected at least one argument.");
return ParseResult();
}
if (isObject(arrayMember(value, 1))) {
ctx.error("First argument must be an image or text section.");
return ParseResult();
}
std::vector<FormatExpressionSection> sections;
bool nextTokenMayBeObject = false;
for (std::size_t i = 1; i <= argsLength - 1; ++i) {
auto arg = arrayMember(value, i);
if (nextTokenMayBeObject && isObject(arg)) {
nextTokenMayBeObject = false;
const optional<Convertible> fontScaleOption = objectMember(arg, kFormattedSectionFontScale);
ParseResult fontScale;
if (fontScaleOption) {
fontScale = ctx.parse(*fontScaleOption, 1, {type::Number});
if (!fontScale) {
return ParseResult();
}
}
const optional<Convertible> textFontOption = objectMember(arg, kFormattedSectionTextFont);
ParseResult textFont;
if (textFontOption) {
textFont = ctx.parse(*textFontOption, 1, {type::Array(type::String)});
if (!textFont) {
return ParseResult();
}
}
const optional<Convertible> textColorOption = objectMember(arg, kFormattedSectionTextColor);
ParseResult textColor;
if (textColorOption) {
textColor = ctx.parse(*textColorOption, 1, {type::Color});
if (!textColor) {
return ParseResult();
}
}
sections.back().setTextSectionOptions(std::move(fontScale), std::move(textFont), std::move(textColor));
} else {
ParseResult parsedArg = ctx.parse(arg, 1, {type::Value});
if (!parsedArg) {
ctx.error("Cannot parse formatted section.");
return ParseResult();
}
nextTokenMayBeObject = true;
sections.emplace_back(std::move(*parsedArg));
}
}
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.content);
if (section.fontScale) {
fn(**section.fontScale);
}
if (section.textFont) {
fn(**section.textFont);
}
if (section.textColor) {
fn(**section.textColor);
}
}
}
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.content != *rhsSection.content) {
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;
}
if ((lhsSection.textColor && (!rhsSection.textColor || **lhsSection.textColor != **rhsSection.textColor)) ||
(!lhsSection.textColor && rhsSection.textColor)) {
return false;
}
}
return true;
}
return false;
}
mbgl::Value FormatExpression::serialize() const {
std::vector<mbgl::Value> serialized{{ getOperator() }};
for (const auto& section : sections) {
serialized.push_back(section.content->serialize());
std::unordered_map<std::string, mbgl::Value> options;
if (section.fontScale) {
options.emplace(kFormattedSectionFontScale, (*section.fontScale)->serialize());
}
if (section.textFont) {
options.emplace(kFormattedSectionTextFont, (*section.textFont)->serialize());
}
if (section.textColor) {
options.emplace(kFormattedSectionTextColor, (*section.textColor)->serialize());
}
serialized.emplace_back(options);
}
return serialized;
}
EvaluationResult FormatExpression::evaluate(const EvaluationContext& params) const {
std::vector<FormattedSection> evaluatedSections;
for (const auto& section : sections) {
auto contentResult = section.content->evaluate(params);
if (!contentResult) {
return contentResult.error();
}
optional<std::string> evaluatedText;
if (typeOf(*contentResult) == type::Image) {
const auto& image = contentResult->get<Image>();
// Omit sections with empty image ids.
if (!image.id().empty()) {
evaluatedSections.emplace_back(image);
}
// Continue evaluation of a next section, as the image section does not have section options.
continue;
} else {
evaluatedText = toString(*contentResult);
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;
}
optional<Color> evaluatedTextColor;
if (section.textColor) {
auto textColorResult = (*section.textColor)->evaluate(params);
if (!textColorResult) {
return textColorResult.error();
}
evaluatedTextColor = fromExpressionValue<Color>(*textColorResult);
if (!evaluatedTextColor) {
return EvaluationError { "Format text-color option must evaluate to Color" };
}
}
evaluatedSections.emplace_back(*evaluatedText, evaluatedFontScale, evaluatedTextFont, evaluatedTextColor);
}
return Formatted(evaluatedSections);
}
} // namespace expression
} // namespace style
} // namespace mbgl
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