[core] Runtime style layer API

1 files changed, 346 insertions, 0 deletions

diff --git a/scripts/generate-style-code.js b/scripts/generate-style-code.js
new file mode 100644
index 0000000000..2904a1429a
--- /dev/null
+++ b/scripts/generate-style-code.js
@@ -0,0 +1,346 @@
+'use strict';
+
+const fs = require('fs');
+const ejs = require('ejs');
+const spec = require('mapbox-gl-style-spec').latest;
+var parseCSSColor = require('csscolorparser').parseCSSColor;
+
+global.camelize = function (str) {
+  return str.replace(/(?:^|-)(.)/g, function (_, x) {
+    return x.toUpperCase();
+  });
+}
+
+global.camelizeWithLeadingLowercase = function (str) {
+  return str.replace(/-(.)/g, function (_, x) {
+    return x.toUpperCase();
+  });
+}
+
+global.propertyType = function (property) {
+  if (/-translate-anchor$/.test(property.name)) {
+    return 'TranslateAnchorType';
+  }
+  if (/-rotation-alignment$/.test(property.name)) {
+    return 'RotationAlignmentType';
+  }
+  switch (property.type) {
+  case 'boolean':
+    return 'bool';
+  case 'number':
+    return 'float';
+  case 'string':
+    return 'std::string';
+  case 'enum':
+    return `${camelize(property.name)}Type`;
+  case 'color':
+    return `Color`;
+  case 'array':
+    if (property.length) {
+      return `std::array<${propertyType({type: property.value})}, ${property.length}>`;
+    } else {
+      return `std::vector<${propertyType({type: property.value})}>`;
+    }
+  default: throw new Error(`unknown type for ${property.name}`)
+  }
+}
+
+global.defaultValue = function (property) {
+  switch (property.type) {
+  case 'number':
+    return property.default;
+  case 'string':
+    return JSON.stringify(property.default || "");
+  case 'enum':
+    return `${propertyType(property)}::${camelize(property.default)}`;
+  case 'color':
+    return `{{ ${parseCSSColor(property.default).join(', ')} }}`
+  case 'array':
+    const defaults = (property.default || []).map((e) => defaultValue({ type: property.value, default: e }));
+    if (property.length) {
+      return `{{ ${defaults.join(', ')} }}`;
+    } else {
+      return `{ ${defaults.join(', ')} }`;
+    }
+  default:
+    return property.default;
+  }
+}
+
+const layerHpp = ejs.compile(`<%
+  const type = locals.type;
+  const layoutProperties = locals.layoutProperties;
+  const paintProperties = locals.paintProperties;
+-%>
+// This file is generated. Do not edit.
+
+#pragma once
+
+#include <mbgl/style/layer.hpp>
+<% if (type === 'line' || type === 'symbol') { %>
+#include <vector>
+<% } -%>
+
+namespace mbgl {
+
+class <%- camelize(type) %>Layer : public Layer {
+public:
+    <%- camelize(type) %>Layer(const std::string& layerID);
+    ~<%- camelize(type) %>Layer() final;
+
+<% if (type === 'raster') { -%>
+    // Source
+
+    void setSource(const std::string& sourceID);
+    const std::string& getSourceID() const;
+
+<% } else if (type !== 'background') { -%>
+    // Source
+
+    void setSource(const std::string& sourceID, const std::string& sourceLayer);
+    const std::string& getSourceID() const;
+    const std::string& getSourceLayer() const;
+
+<% } -%>
+<% if (layoutProperties.length) { -%>
+    // Layout properties
+
+<% for (const property of layoutProperties) { -%>
+    Function<<%- propertyType(property) %>> get<%- camelize(property.name) %>() const;
+    void set<%- camelize(property.name) %>(Function<<%- propertyType(property) %>>);
+
+<% } -%>
+<% } -%>
+    // Paint properties
+
+<% for (const property of paintProperties) { -%>
+    Function<<%- propertyType(property) %>> get<%- camelize(property.name) %>() const;
+    void set<%- camelize(property.name) %>(Function<<%- propertyType(property) %>>);
+
+<% } -%>
+    // Private implementation
+
+    class Impl;
+    Impl* const impl;
+
+    <%- camelize(type) %>Layer(const Impl&);
+    <%- camelize(type) %>Layer(const <%- camelize(type) %>Layer&) = delete;
+};
+
+template <>
+inline bool Layer::is<<%- camelize(type) %>Layer>() const {
+    return type == Type::<%- camelize(type) %>;
+}
+
+} // namespace mbgl
+`, {strict: true});
+
+const layerCpp = ejs.compile(`<%
+  const type = locals.type;
+  const layoutProperties = locals.layoutProperties;
+  const paintProperties = locals.paintProperties;
+-%>
+// This file is generated. Edit scripts/generate-style-code.js, then run \`make style-code\`.
+
+#include <mbgl/layer/<%- type %>_layer.hpp>
+#include <mbgl/layer/<%- type %>_layer_impl.hpp>
+
+namespace mbgl {
+
+<%- camelize(type) %>Layer::<%- camelize(type) %>Layer(const std::string& layerID)
+    : Layer(Type::<%- camelize(type) %>, std::make_unique<Impl>())
+    , impl(static_cast<Impl*>(baseImpl.get())) {
+    impl->id = layerID;
+}
+
+<%- camelize(type) %>Layer::<%- camelize(type) %>Layer(const Impl& other)
+    : Layer(Type::<%- camelize(type) %>, std::make_unique<Impl>(other))
+    , impl(static_cast<Impl*>(baseImpl.get())) {
+}
+
+<%- camelize(type) %>Layer::~<%- camelize(type) %>Layer() = default;
+
+std::unique_ptr<Layer> <%- camelize(type) %>Layer::Impl::clone() const {
+    return std::make_unique<<%- camelize(type) %>Layer>(*this);
+}
+
+<% if (type === 'raster') { -%>
+// Source
+
+void <%- camelize(type) %>Layer::setSource(const std::string& sourceID) {
+    impl->source = sourceID;
+}
+
+const std::string& <%- camelize(type) %>Layer::getSourceID() const {
+    return impl->source;
+}
+<% } else if (type !== 'background') { -%>
+// Source
+
+void <%- camelize(type) %>Layer::setSource(const std::string& sourceID, const std::string& sourceLayer) {
+    impl->source = sourceID;
+    impl->sourceLayer = sourceLayer;
+}
+
+const std::string& <%- camelize(type) %>Layer::getSourceID() const {
+    return impl->source;
+}
+
+const std::string& <%- camelize(type) %>Layer::getSourceLayer() const {
+    return impl->sourceLayer;
+}
+<% } -%>
+
+// Layout properties
+
+<% for (const property of layoutProperties) { -%>
+Function<<%- propertyType(property) %>> <%- camelize(type) %>Layer::get<%- camelize(property.name) %>() const {
+    return *impl->layout.<%- camelizeWithLeadingLowercase(property.name) %>.parsedValue;
+}
+
+void <%- camelize(type) %>Layer::set<%- camelize(property.name) %>(Function<<%- propertyType(property) %>> value) {
+    impl->layout.<%- camelizeWithLeadingLowercase(property.name) %>.parsedValue = value;
+}
+<% } -%>
+
+// Paint properties
+<% for (const property of paintProperties) { %>
+Function<<%- propertyType(property) %>> <%- camelize(type) %>Layer::get<%- camelize(property.name) %>() const {
+    return impl->paint.<%- camelizeWithLeadingLowercase(property.name) %>.values.at(ClassID::Default);
+}
+
+void <%- camelize(type) %>Layer::set<%- camelize(property.name) %>(Function<<%- propertyType(property) %>> value) {
+    impl->paint.<%- camelizeWithLeadingLowercase(property.name) %>.values.emplace(ClassID::Default, value);
+}
+<% } -%>
+
+} // namespace mbgl
+`, {strict: true});
+
+const propertiesHpp = ejs.compile(`<%
+  const type = locals.type;
+  const layoutProperties = locals.layoutProperties;
+  const paintProperties = locals.paintProperties;
+-%>
+// This file is generated. Edit scripts/generate-style-code.js, then run \`make style-code\`.
+
+#pragma once
+
+#include <mbgl/style/layout_property.hpp>
+#include <mbgl/style/paint_property.hpp>
+#include <mbgl/util/rapidjson.hpp>
+
+namespace mbgl {
+
+class StyleCascadeParameters;
+class StyleCalculationParameters;
+
+<% if (layoutProperties.length) { -%>
+class <%- camelize(type) %>LayoutProperties {
+public:
+    void parse(const JSValue&);
+    void recalculate(const StyleCalculationParameters&);
+
+<% for (const property of layoutProperties) { -%>
+    LayoutProperty<<%- propertyType(property) %>> <%- camelizeWithLeadingLowercase(property.name) %> { <%- defaultValue(property) %> };
+<% } -%>
+};
+
+<% } -%>
+class <%- camelize(type) %>PaintProperties {
+public:
+    void parse(const JSValue&);
+    void cascade(const StyleCascadeParameters&);
+    bool recalculate(const StyleCalculationParameters&);
+
+<% for (const property of paintProperties) { -%>
+<% if (/-pattern$/.test(property.name) || property.name === 'line-dasharray') { -%>
+    PaintProperty<<%- propertyType(property) %>, CrossFadedFunctionEvaluator> <%- camelizeWithLeadingLowercase(property.name) %> { <%- defaultValue(property) %> };
+<% } else if (property.name === 'fill-outline-color') { -%>
+    PaintProperty<<%- propertyType(property) %>> <%- camelizeWithLeadingLowercase(property.name) %> { {{ 0, 0, 0, -1 }} };
+<% } else { -%>
+    PaintProperty<<%- propertyType(property) %>> <%- camelizeWithLeadingLowercase(property.name) %> { <%- defaultValue(property) %> };
+<% } -%>
+<% } -%>
+};
+
+} // namespace mbgl
+`, {strict: true});
+
+const propertiesCpp = ejs.compile(`<%
+  const type = locals.type;
+  const layoutProperties = locals.layoutProperties;
+  const paintProperties = locals.paintProperties;
+-%>
+// This file is generated. Edit scripts/generate-style-code.js, then run \`make style-code\`.
+
+#include <mbgl/layer/<%- type %>_layer_properties.hpp>
+
+namespace mbgl {
+
+<% if (layoutProperties.length) { -%>
+void <%- camelize(type) %>LayoutProperties::parse(const JSValue& value) {
+<% for (const property of layoutProperties) { -%>
+    <%- camelizeWithLeadingLowercase(property.name) %>.parse(<%- JSON.stringify(property.name) %>, value);
+<% } -%>
+}
+
+void <%- camelize(type) %>LayoutProperties::recalculate(const StyleCalculationParameters& parameters) {
+<% for (const property of layoutProperties) { -%>
+    <%- camelizeWithLeadingLowercase(property.name) %>.calculate(parameters);
+<% } -%>
+}
+
+<% } -%>
+void <%- camelize(type) %>PaintProperties::parse(const JSValue& value) {
+<% for (const property of paintProperties) { -%>
+    <%- camelizeWithLeadingLowercase(property.name) %>.parse(<%- JSON.stringify(property.name) %>, value);
+<% } -%>
+}
+
+void <%- camelize(type) %>PaintProperties::cascade(const StyleCascadeParameters& parameters) {
+<% for (const property of paintProperties) { -%>
+    <%- camelizeWithLeadingLowercase(property.name) %>.cascade(parameters);
+<% } -%>
+}
+
+bool <%- camelize(type) %>PaintProperties::recalculate(const StyleCalculationParameters& parameters) {
+    bool hasTransitions = false;
+
+<% for (const property of paintProperties) { -%>
+    hasTransitions |= <%- camelizeWithLeadingLowercase(property.name) %>.calculate(parameters);
+<% } -%>
+
+    return hasTransitions;
+}
+
+} // namespace mbgl
+`, {strict: true});
+
+for (const type of spec.layer.type.values) {
+  const layoutProperties = Object.keys(spec[`layout_${type}`]).reduce((memo, name) => {
+    if (name !== 'visibility') {
+      spec[`layout_${type}`][name].name = name;
+      memo.push(spec[`layout_${type}`][name]);
+    }
+    return memo;
+  }, []);
+
+  const paintProperties = Object.keys(spec[`paint_${type}`]).reduce((memo, name) => {
+    spec[`paint_${type}`][name].name = name;
+    memo.push(spec[`paint_${type}`][name]);
+    return memo;
+  }, []);
+
+  const layer = {
+    type: type,
+    layoutProperties: layoutProperties,
+    paintProperties: paintProperties,
+  };
+
+  fs.writeFileSync(`include/mbgl/layer/${type}_layer.hpp`, layerHpp(layer));
+  fs.writeFileSync(`src/mbgl/layer/${type}_layer.cpp`, layerCpp(layer));
+
+  fs.writeFileSync(`src/mbgl/layer/${type}_layer_properties.hpp`, propertiesHpp(layer));
+  fs.writeFileSync(`src/mbgl/layer/${type}_layer_properties.cpp`, propertiesCpp(layer));
+}