373 lines
12 KiB
C++
373 lines
12 KiB
C++
#include <mbgl/style/style_parser.hpp>
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#include <mbgl/layer/fill_layer.hpp>
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#include <mbgl/layer/line_layer.hpp>
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#include <mbgl/layer/circle_layer.hpp>
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#include <mbgl/layer/symbol_layer.hpp>
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#include <mbgl/layer/raster_layer.hpp>
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#include <mbgl/layer/background_layer.hpp>
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#include <mbgl/platform/log.hpp>
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#include <algorithm>
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namespace mbgl {
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StyleParser::~StyleParser() = default;
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void StyleParser::parse(const JSValue& document) {
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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Log::Warning(Event::ParseStyle, "current renderer implementation only supports style spec version 8; using an outdated style will cause rendering errors");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 StyleParser::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 have one of the enum values");
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continue;
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}
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const auto type = SourceTypeClass({ typeVal.GetString(), typeVal.GetStringLength() });
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const std::string id { nameVal.GetString(), nameVal.GetStringLength() };
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std::unique_ptr<Source> source = std::make_unique<Source>(type, id);
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switch (type) {
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case SourceType::Vector:
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if (!parseVectorSource(*source, sourceVal)) {
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continue;
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}
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break;
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case SourceType::Raster:
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if (!parseRasterSource(*source, sourceVal)) {
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continue;
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}
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break;
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case SourceType::GeoJSON:
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if (!parseGeoJSONSource(*source, sourceVal)) {
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continue;
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}
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break;
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default:
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Log::Warning(Event::ParseStyle, "source type %s is not supported", type.c_str());
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}
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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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bool StyleParser::parseVectorSource(Source& source, const JSValue& sourceVal) {
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// A vector tile source either specifies the URL of a TileJSON file...
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if (sourceVal.HasMember("url")) {
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const JSValue& urlVal = sourceVal["url"];
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if (!urlVal.IsString()) {
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Log::Warning(Event::ParseStyle, "source url must be a string");
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return false;
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}
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source.info.url = { urlVal.GetString(), urlVal.GetStringLength() };
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} else {
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// ...or the TileJSON directly.
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source.parseTileJSON(sourceVal);
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}
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return true;
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}
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bool StyleParser::parseRasterSource(Source& source, const JSValue& sourceVal) {
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if (sourceVal.HasMember("tileSize")) {
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const JSValue& tileSizeVal = sourceVal["tileSize"];
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if (!tileSizeVal.IsUint()) {
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Log::Warning(Event::ParseStyle, "source tileSize must be an unsigned integer");
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return false;
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}
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unsigned int intValue = tileSizeVal.GetUint();
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if (intValue > std::numeric_limits<uint16_t>::max()) {
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Log::Warning(Event::ParseStyle, "values for tileSize that are larger than %d are not supported", std::numeric_limits<uint16_t>::max());
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return false;
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}
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source.info.tile_size = intValue;
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}
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// A raster tile source either specifies the URL of a TileJSON file...
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if (sourceVal.HasMember("url")) {
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const JSValue& urlVal = sourceVal["url"];
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if (!urlVal.IsString()) {
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Log::Warning(Event::ParseStyle, "source url must be a string");
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return false;
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}
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source.info.url = { urlVal.GetString(), urlVal.GetStringLength() };
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} else {
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// ...or the TileJSON directly.
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source.parseTileJSON(sourceVal);
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}
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return true;
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}
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bool StyleParser::parseGeoJSONSource(Source& source, const JSValue& sourceVal) {
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if (!sourceVal.HasMember("data")) {
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Log::Warning(Event::ParseStyle, "GeoJSON source must have a data value");
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return false;
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}
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const JSValue& dataVal = sourceVal["data"];
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if (dataVal.IsString()) {
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// We need to load an external GeoJSON file
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source.info.url = { dataVal.GetString(), dataVal.GetStringLength() };
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} else if (dataVal.IsObject()) {
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// We need to parse dataVal as a GeoJSON object
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source.parseGeoJSON(dataVal);
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} else {
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Log::Error(Event::ParseStyle, "GeoJSON data must be a URL or an object");
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return false;
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}
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return true;
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}
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void StyleParser::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<StyleLayer>> { 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 StyleParser::parseLayer(const std::string& id, const JSValue& value, std::unique_ptr<StyleLayer>& 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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StyleLayer* 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->clone();
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layer->id = id;
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layer->ref = ref;
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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>();
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} else if (type == "line") {
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layer = std::make_unique<LineLayer>();
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} else if (type == "circle") {
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layer = std::make_unique<CircleLayer>();
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} else if (type == "symbol") {
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layer = std::make_unique<SymbolLayer>();
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} else if (type == "raster") {
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layer = std::make_unique<RasterLayer>();
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} else if (type == "background") {
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layer = std::make_unique<BackgroundLayer>();
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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->id = id;
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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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layer->source = { value_source.GetString(), value_source.GetStringLength() };
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auto source_it = sourcesMap.find(layer->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'", layer->source.c_str(), layer->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", layer->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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layer->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", layer->id.c_str());
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}
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}
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if (value.HasMember("filter")) {
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layer->filter = parseFilterExpression(value["filter"]);
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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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layer->minZoom = min_zoom.GetDouble();
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} else {
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Log::Warning(Event::ParseStyle, "minzoom of layer %s must be numeric", layer->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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layer->maxZoom = max_zoom.GetDouble();
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} else {
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Log::Warning(Event::ParseStyle, "maxzoom of layer %s must be numeric", layer->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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layer->parseLayout(value["layout"]);
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}
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}
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layer->parsePaints(value);
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}
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void StyleParser::parseVisibility(StyleLayer& layer, const JSValue& value) {
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if (!value.HasMember("visibility")) {
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return;
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} else if (!value["visibility"].IsString()) {
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Log::Warning(Event::ParseStyle, "value of 'visibility' must be a string");
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layer.visibility = VisibilityType::Visible;
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return;
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}
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layer.visibility = VisibilityTypeClass({ value["visibility"].GetString(), value["visibility"].GetStringLength() });
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}
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} // namespace mbgl
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