360 lines
12 KiB
C++
360 lines
12 KiB
C++
#include <mbgl/style/parser.hpp>
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#include <mbgl/style/sources/raster_source_impl.hpp>
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#include <mbgl/style/sources/vector_source_impl.hpp>
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#include <mbgl/style/sources/geojson_source_impl.hpp>
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#include <mbgl/style/layer_impl.hpp>
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#include <mbgl/style/layers/fill_layer.hpp>
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#include <mbgl/style/layers/line_layer.hpp>
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#include <mbgl/style/layers/circle_layer.hpp>
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#include <mbgl/style/layers/symbol_layer.hpp>
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#include <mbgl/style/layers/raster_layer.hpp>
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#include <mbgl/style/layers/background_layer.hpp>
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#include <mbgl/style/rapidjson_conversion.hpp>
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#include <mbgl/style/conversion.hpp>
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#include <mbgl/style/conversion/filter.hpp>
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#include <mbgl/platform/log.hpp>
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#include <mbgl/tile/geometry_tile_data.hpp>
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#include <mbgl/util/enum.hpp>
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#include <mbgl/util/tileset.hpp>
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#include <rapidjson/document.h>
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#include <rapidjson/error/en.h>
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#include <algorithm>
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#include <set>
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namespace mbgl {
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namespace style {
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Parser::~Parser() = default;
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void Parser::parse(const std::string& json) {
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rapidjson::GenericDocument<rapidjson::UTF8<>, rapidjson::CrtAllocator> document;
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document.Parse<0>(json.c_str());
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if (document.HasParseError()) {
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Log::Error(Event::ParseStyle, "Error parsing style JSON at %i: %s", document.GetErrorOffset(), rapidjson::GetParseError_En(document.GetParseError()));
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return;
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}
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if (document.HasMember("version")) {
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int version = document["version"].GetInt();
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if (version != 8) {
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Log::Warning(Event::ParseStyle, "current renderer implementation only supports style spec version 8; using an outdated style will cause rendering errors");
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}
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}
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if (document.HasMember("sources")) {
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parseSources(document["sources"]);
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}
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if (document.HasMember("layers")) {
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parseLayers(document["layers"]);
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}
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if (document.HasMember("sprite")) {
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const JSValue& sprite = document["sprite"];
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if (sprite.IsString()) {
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spriteURL = { sprite.GetString(), sprite.GetStringLength() };
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}
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}
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if (document.HasMember("glyphs")) {
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const JSValue& glyphs = document["glyphs"];
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if (glyphs.IsString()) {
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glyphURL = { glyphs.GetString(), glyphs.GetStringLength() };
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}
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}
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}
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void Parser::parseSources(const JSValue& value) {
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if (!value.IsObject()) {
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Log::Warning(Event::ParseStyle, "sources must be an object");
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return;
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}
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JSValue::ConstMemberIterator itr = value.MemberBegin();
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for (; itr != value.MemberEnd(); ++itr) {
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const JSValue& nameVal = itr->name;
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const JSValue& sourceVal = itr->value;
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if (!sourceVal.HasMember("type")) {
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Log::Warning(Event::ParseStyle, "source must have a type");
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continue;
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}
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const JSValue& typeVal = sourceVal["type"];
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if (!typeVal.IsString()) {
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Log::Warning(Event::ParseStyle, "source type must be a string");
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continue;
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}
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const auto type = Enum<SourceType>::toEnum({ typeVal.GetString(), typeVal.GetStringLength() });
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if (!type) {
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Log::Warning(Event::ParseStyle, "source type must have one of the enum values");
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continue;
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}
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const std::string id { nameVal.GetString(), nameVal.GetStringLength() };
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std::unique_ptr<Source> source;
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switch (*type) {
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case SourceType::Raster: {
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source = RasterSource::Impl::parse(id, sourceVal);
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break;
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}
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case SourceType::Vector:
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source = VectorSource::Impl::parse(id, sourceVal);
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break;
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case SourceType::GeoJSON:
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source = GeoJSONSource::Impl::parse(id, sourceVal);
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break;
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default:
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Log::Error(Event::ParseStyle, "source type '%s' is not supported", typeVal.GetString());
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continue;
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}
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if (source) {
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sourcesMap.emplace(id, source.get());
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sources.emplace_back(std::move(source));
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}
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}
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}
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void Parser::parseLayers(const JSValue& value) {
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std::vector<std::string> ids;
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if (!value.IsArray()) {
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Log::Warning(Event::ParseStyle, "layers must be an array");
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return;
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}
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for (rapidjson::SizeType i = 0; i < value.Size(); ++i) {
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const JSValue& layerValue = value[i];
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if (!layerValue.IsObject()) {
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Log::Warning(Event::ParseStyle, "layer must be an object");
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continue;
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}
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if (!layerValue.HasMember("id")) {
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Log::Warning(Event::ParseStyle, "layer must have an id");
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continue;
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}
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const JSValue& id = layerValue["id"];
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if (!id.IsString()) {
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Log::Warning(Event::ParseStyle, "layer id must be a string");
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continue;
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}
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const std::string layerID = { id.GetString(), id.GetStringLength() };
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if (layersMap.find(layerID) != layersMap.end()) {
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Log::Warning(Event::ParseStyle, "duplicate layer id %s", layerID.c_str());
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continue;
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}
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layersMap.emplace(layerID, std::pair<const JSValue&, std::unique_ptr<Layer>> { layerValue, nullptr });
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ids.push_back(layerID);
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}
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for (const auto& id : ids) {
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auto it = layersMap.find(id);
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parseLayer(it->first,
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it->second.first,
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it->second.second);
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}
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for (const auto& id : ids) {
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auto it = layersMap.find(id);
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if (it->second.second) {
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layers.emplace_back(std::move(it->second.second));
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}
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}
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}
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void Parser::parseLayer(const std::string& id, const JSValue& value, std::unique_ptr<Layer>& layer) {
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if (layer) {
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// Skip parsing this again. We already have a valid layer definition.
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return;
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}
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// Make sure we have not previously attempted to parse this layer.
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if (std::find(stack.begin(), stack.end(), id) != stack.end()) {
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Log::Warning(Event::ParseStyle, "layer reference of '%s' is circular", id.c_str());
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return;
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}
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if (value.HasMember("ref")) {
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// This layer is referencing another layer. Recursively parse that layer.
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const JSValue& refVal = value["ref"];
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if (!refVal.IsString()) {
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Log::Warning(Event::ParseStyle, "layer ref of '%s' must be a string", id.c_str());
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return;
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}
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const std::string ref { refVal.GetString(), refVal.GetStringLength() };
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auto it = layersMap.find(ref);
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if (it == layersMap.end()) {
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Log::Warning(Event::ParseStyle, "layer '%s' references unknown layer %s", id.c_str(), ref.c_str());
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return;
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}
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// Recursively parse the referenced layer.
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stack.push_front(id);
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parseLayer(it->first,
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it->second.first,
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it->second.second);
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stack.pop_front();
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Layer* reference = it->second.second.get();
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if (!reference) {
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return;
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}
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layer = reference->copy(id, ref);
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layer->baseImpl->parsePaints(value);
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} else {
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// Otherwise, parse the source/source-layer/filter/render keys to form the bucket.
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if (!value.HasMember("type")) {
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Log::Warning(Event::ParseStyle, "layer '%s' is missing a type", id.c_str());
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return;
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}
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const JSValue& typeVal = value["type"];
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if (!typeVal.IsString()) {
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Log::Warning(Event::ParseStyle, "layer '%s' has an invalid type", id.c_str());
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return;
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}
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std::string type { typeVal.GetString(), typeVal.GetStringLength() };
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if (type == "fill") {
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layer = std::make_unique<FillLayer>(id);
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} else if (type == "line") {
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layer = std::make_unique<LineLayer>(id);
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} else if (type == "circle") {
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layer = std::make_unique<CircleLayer>(id);
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} else if (type == "symbol") {
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layer = std::make_unique<SymbolLayer>(id);
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} else if (type == "raster") {
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layer = std::make_unique<RasterLayer>(id);
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} else if (type == "background") {
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layer = std::make_unique<BackgroundLayer>(id);
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} else {
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Log::Warning(Event::ParseStyle, "unknown type '%s' for layer '%s'", type.c_str(), id.c_str());
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return;
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}
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Layer::Impl* impl = layer->baseImpl.get();
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if (value.HasMember("source")) {
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const JSValue& value_source = value["source"];
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if (value_source.IsString()) {
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impl->source = { value_source.GetString(), value_source.GetStringLength() };
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auto source_it = sourcesMap.find(impl->source);
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if (source_it == sourcesMap.end()) {
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Log::Warning(Event::ParseStyle, "can't find source '%s' required for layer '%s'", impl->source.c_str(), impl->id.c_str());
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}
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} else {
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Log::Warning(Event::ParseStyle, "source of layer '%s' must be a string", impl->id.c_str());
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}
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}
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if (value.HasMember("source-layer")) {
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const JSValue& value_source_layer = value["source-layer"];
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if (value_source_layer.IsString()) {
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impl->sourceLayer = { value_source_layer.GetString(), value_source_layer.GetStringLength() };
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} else {
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Log::Warning(Event::ParseStyle, "source-layer of layer '%s' must be a string", impl->id.c_str());
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}
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}
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if (value.HasMember("filter")) {
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conversion::Result<Filter> filter = conversion::convert<Filter>(value["filter"]);
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if (filter) {
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impl->filter = *filter;
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} else {
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Log::Warning(Event::ParseStyle, filter.error().message);
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}
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}
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if (value.HasMember("minzoom")) {
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const JSValue& min_zoom = value["minzoom"];
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if (min_zoom.IsNumber()) {
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impl->minZoom = min_zoom.GetDouble();
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} else {
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Log::Warning(Event::ParseStyle, "minzoom of layer %s must be numeric", impl->id.c_str());
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}
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}
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if (value.HasMember("maxzoom")) {
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const JSValue& max_zoom = value["maxzoom"];
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if (max_zoom.IsNumber()) {
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impl->maxZoom = max_zoom.GetDouble();
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} else {
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Log::Warning(Event::ParseStyle, "maxzoom of layer %s must be numeric", impl->id.c_str());
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}
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}
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if (value.HasMember("layout")) {
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parseVisibility(*layer, value["layout"]);
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impl->parseLayout(value["layout"]);
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}
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impl->parsePaints(value);
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}
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}
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void Parser::parseVisibility(Layer& layer, const JSValue& value) {
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Layer::Impl& impl = *layer.baseImpl;
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if (!value.HasMember("visibility")) {
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return;
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}
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if (!value["visibility"].IsString()) {
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Log::Warning(Event::ParseStyle, "value of 'visibility' must be a string");
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return;
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}
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const auto enumValue = Enum<VisibilityType>::toEnum({ value["visibility"].GetString(), value["visibility"].GetStringLength() });
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if (!enumValue) {
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Log::Warning(Event::ParseStyle, "value of 'visibility' must be a valid enumeration value");
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return;
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}
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impl.visibility = *enumValue;
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}
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std::vector<FontStack> Parser::fontStacks() const {
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std::set<FontStack> result;
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for (const auto& layer : layers) {
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if (layer->is<SymbolLayer>()) {
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PropertyValue<FontStack> textFont = layer->as<SymbolLayer>()->getTextFont();
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if (textFont.isUndefined()) {
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result.insert({"Open Sans Regular", "Arial Unicode MS Regular"});
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} else if (textFont.isConstant()) {
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result.insert(textFont.asConstant());
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} else if (textFont.isFunction()) {
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for (const auto& stop : textFont.asFunction().getStops()) {
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result.insert(stop.second);
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}
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}
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}
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}
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return std::vector<FontStack>(result.begin(), result.end());
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}
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} // namespace style
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} // namespace mbgl
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