690 lines
23 KiB
C++
690 lines
23 KiB
C++
#include <mbgl/style/parser.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/platform/log.hpp>
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#include <mapbox/geojsonvt.hpp>
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#include <mapbox/geojsonvt/convert.hpp>
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#include <mbgl/tile/geometry_tile.hpp>
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#include <mbgl/util/mapbox.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 <sstream>
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#include <set>
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namespace mbgl {
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namespace style {
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namespace {
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void parseTileJSONMember(const JSValue& value, std::vector<std::string>& target, const char* name) {
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if (!value.HasMember(name)) {
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return;
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}
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const JSValue& property = value[name];
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if (!property.IsArray()) {
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return;
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}
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for (rapidjson::SizeType i = 0; i < property.Size(); i++) {
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if (!property[i].IsString()) {
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return;
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}
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}
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for (rapidjson::SizeType i = 0; i < property.Size(); i++) {
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target.emplace_back(std::string(property[i].GetString(), property[i].GetStringLength()));
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}
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}
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void parseTileJSONMember(const JSValue& value, std::string& target, const char* name) {
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if (!value.HasMember(name)) {
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return;
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}
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const JSValue& property = value[name];
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if (!property.IsString()) {
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return;
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}
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target = { property.GetString(), property.GetStringLength() };
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}
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void parseTileJSONMember(const JSValue& value, uint8_t& target, const char* name) {
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if (!value.HasMember(name)) {
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return;
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}
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const JSValue& property = value[name];
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if (!property.IsUint()) {
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return;
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}
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unsigned int uint = property.GetUint();
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if (uint > std::numeric_limits<uint8_t>::max()) {
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return;
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}
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target = uint;
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}
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void parseTileJSONMember(const JSValue& value, std::array<double, 4>& target, const char* name) {
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if (!value.HasMember(name)) {
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return;
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}
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const JSValue& property = value[name];
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if (!property.IsArray() || property.Size() > 4) {
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return;
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}
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for (rapidjson::SizeType i = 0; i < property.Size(); i++) {
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if (!property[i].IsNumber()) {
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return;
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}
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}
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for (rapidjson::SizeType i = 0; i < property.Size(); i++) {
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target[i] = property[i].GetDouble();
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}
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}
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} // end namespace
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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 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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// Sources can have URLs, either because they reference an external TileJSON file, or
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// because reference a GeoJSON file. They don't have to have one though when all source
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// parameters are specified inline.
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std::string url;
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uint16_t tileSize = util::tileSize;
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std::unique_ptr<Tileset> tileset;
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std::unique_ptr<mapbox::geojsonvt::GeoJSONVT> geojsonvt;
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switch (type) {
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case SourceType::Raster:
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if (sourceVal.HasMember("tileSize")) {
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const JSValue& tileSizeVal = sourceVal["tileSize"];
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if (tileSizeVal.IsNumber() && tileSizeVal.GetUint64() <= std::numeric_limits<uint16_t>::max()) {
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tileSize = tileSizeVal.GetUint64();
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} else {
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Log::Error(Event::ParseStyle, "invalid tileSize");
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continue;
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}
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}
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// Fall through. Vector sources are forbidden from having a tileSize.
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case SourceType::Vector:
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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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url = { urlVal.GetString(), urlVal.GetStringLength() };
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} else {
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Log::Error(Event::ParseStyle, "source url must be a string");
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continue;
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}
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} else {
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tileset = parseTileJSON(sourceVal);
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}
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break;
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case SourceType::GeoJSON:
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tileset = std::make_unique<Tileset>();
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// We should probably split this up to have URLs in the url property, and actual data
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// in the data property. Until then, we're going to detect the content based on the
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// object type.
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if (sourceVal.HasMember("data")) {
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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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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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geojsonvt = parseGeoJSON(dataVal);
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tileset->maxZoom = geojsonvt->options.maxZoom;
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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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continue;
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}
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} else {
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Log::Error(Event::ParseStyle, "GeoJSON source must have a data value");
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continue;
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}
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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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const std::string id { nameVal.GetString(), nameVal.GetStringLength() };
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std::unique_ptr<Source> source = std::make_unique<Source>(type, id, url, tileSize, std::move(tileset), std::move(geojsonvt));
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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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std::unique_ptr<mapbox::geojsonvt::GeoJSONVT> parseGeoJSON(const JSValue& value) {
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using namespace mapbox::geojsonvt;
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Options options;
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options.buffer = util::EXTENT / util::tileSize * 128;
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options.extent = util::EXTENT;
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try {
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return std::make_unique<GeoJSONVT>(Convert::convert(value, 0), options);
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} catch (const std::exception& ex) {
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Log::Error(Event::ParseStyle, "Failed to parse GeoJSON data: %s", ex.what());
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// Create an empty GeoJSON VT object to make sure we're not infinitely waiting for
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// tiles to load.
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return std::make_unique<GeoJSONVT>(std::vector<ProjectedFeature>{}, options);
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}
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}
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std::unique_ptr<Tileset> parseTileJSON(const std::string& json, const std::string& sourceURL, SourceType type, uint16_t tileSize) {
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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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std::stringstream message;
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message << document.GetErrorOffset() << " - " << rapidjson::GetParseError_En(document.GetParseError());
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throw std::runtime_error(message.str());
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}
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std::unique_ptr<Tileset> result = parseTileJSON(document);
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// TODO: Remove this hack by delivering proper URLs in the TileJSON to begin with.
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if (util::mapbox::isMapboxURL(sourceURL)) {
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for (auto& url : result->tiles) {
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url = util::mapbox::canonicalizeTileURL(url, type, tileSize);
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}
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}
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return result;
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}
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std::unique_ptr<Tileset> parseTileJSON(const JSValue& value) {
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auto tileset = std::make_unique<Tileset>();
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parseTileJSONMember(value, tileset->tiles, "tiles");
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parseTileJSONMember(value, tileset->minZoom, "minzoom");
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parseTileJSONMember(value, tileset->maxZoom, "maxzoom");
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parseTileJSONMember(value, tileset->attribution, "attribution");
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std::array<double, 4> array;
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parseTileJSONMember(value, array, "center");
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tileset->center = { array[0], array[1] };
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tileset->zoom = array[2];
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parseTileJSONMember(value, array, "bounds");
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tileset->bounds = LatLngBounds::hull({ array[0], array[1] }, { array[2], array[3] });
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return tileset;
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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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impl->filter = parseFilter(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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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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MBGL_DEFINE_ENUM_CLASS(VisibilityTypeClass, VisibilityType, {
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{ VisibilityType::Visible, "visible" },
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{ VisibilityType::None, "none" },
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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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} else if (!value["visibility"].IsString()) {
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Log::Warning(Event::ParseStyle, "value of 'visibility' must be a string");
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impl.visibility = VisibilityType::Visible;
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return;
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}
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impl.visibility = VisibilityTypeClass({ value["visibility"].GetString(), value["visibility"].GetStringLength() });
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}
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Value parseFeatureType(const Value& value) {
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if (value == std::string("Point")) {
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return Value(uint64_t(FeatureType::Point));
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} else if (value == std::string("LineString")) {
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return Value(uint64_t(FeatureType::LineString));
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} else if (value == std::string("Polygon")) {
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return Value(uint64_t(FeatureType::Polygon));
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} else {
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Log::Warning(Event::ParseStyle, "value for $type filter must be Point, LineString, or Polygon");
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return Value(uint64_t(FeatureType::Unknown));
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}
|
|
}
|
|
|
|
Value parseValue(const JSValue& value) {
|
|
switch (value.GetType()) {
|
|
case rapidjson::kNullType:
|
|
case rapidjson::kFalseType:
|
|
return false;
|
|
|
|
case rapidjson::kTrueType:
|
|
return true;
|
|
|
|
case rapidjson::kStringType:
|
|
return std::string { value.GetString(), value.GetStringLength() };
|
|
|
|
case rapidjson::kNumberType:
|
|
if (value.IsUint64()) return value.GetUint64();
|
|
if (value.IsInt64()) return value.GetInt64();
|
|
return value.GetDouble();
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
template <class Expression>
|
|
Filter parseUnaryFilter(const JSValue& value) {
|
|
Filter empty;
|
|
|
|
if (value.Size() < 2) {
|
|
Log::Warning(Event::ParseStyle, "filter expression must have 2 elements");
|
|
return empty;
|
|
}
|
|
|
|
if (!value[1u].IsString()) {
|
|
Log::Warning(Event::ParseStyle, "filter expression key must be a string");
|
|
return empty;
|
|
}
|
|
|
|
Expression expression;
|
|
expression.key = { value[1u].GetString(), value[1u].GetStringLength() };
|
|
return expression;
|
|
}
|
|
|
|
template <class Expression>
|
|
Filter parseBinaryFilter(const JSValue& value) {
|
|
Filter empty;
|
|
|
|
if (value.Size() < 3) {
|
|
Log::Warning(Event::ParseStyle, "filter expression must have 3 elements");
|
|
return empty;
|
|
}
|
|
|
|
if (!value[1u].IsString()) {
|
|
Log::Warning(Event::ParseStyle, "filter expression key must be a string");
|
|
return empty;
|
|
}
|
|
|
|
Expression expression;
|
|
expression.key = { value[1u].GetString(), value[1u].GetStringLength() };
|
|
expression.value = parseValue(value[2u]);
|
|
|
|
if (expression.key == "$type") {
|
|
expression.value = parseFeatureType(expression.value);
|
|
}
|
|
|
|
return expression;
|
|
}
|
|
|
|
template <class Expression>
|
|
Filter parseSetFilter(const JSValue& value) {
|
|
Filter empty;
|
|
|
|
if (value.Size() < 2) {
|
|
Log::Warning(Event::ParseStyle, "filter expression must at least 2 elements");
|
|
return empty;
|
|
}
|
|
|
|
if (!value[1u].IsString()) {
|
|
Log::Warning(Event::ParseStyle, "filter expression key must be a string");
|
|
return empty;
|
|
}
|
|
|
|
Expression expression;
|
|
expression.key = { value[1u].GetString(), value[1u].GetStringLength() };
|
|
for (rapidjson::SizeType i = 2; i < value.Size(); ++i) {
|
|
Value parsedValue = parseValue(value[i]);
|
|
if (expression.key == "$type") {
|
|
parsedValue = parseFeatureType(parsedValue);
|
|
}
|
|
expression.values.push_back(parsedValue);
|
|
}
|
|
return expression;
|
|
}
|
|
|
|
template <class Expression>
|
|
Filter parseCompoundFilter(const JSValue& value) {
|
|
Expression expression;
|
|
for (rapidjson::SizeType i = 1; i < value.Size(); ++i) {
|
|
expression.filters.push_back(parseFilter(value[i]));
|
|
}
|
|
return expression;
|
|
}
|
|
|
|
Filter parseFilter(const JSValue& value) {
|
|
Filter empty;
|
|
|
|
if (!value.IsArray()) {
|
|
Log::Warning(Event::ParseStyle, "filter expression must be an array");
|
|
return empty;
|
|
}
|
|
|
|
if (value.Size() < 1) {
|
|
Log::Warning(Event::ParseStyle, "filter expression must have at least 1 element");
|
|
return empty;
|
|
}
|
|
|
|
if (!value[0u].IsString()) {
|
|
Log::Warning(Event::ParseStyle, "filter operator must be a string");
|
|
return empty;
|
|
}
|
|
|
|
std::string op = { value[0u].GetString(), value[0u].GetStringLength() };
|
|
|
|
if (op == "==") {
|
|
return parseBinaryFilter<EqualsFilter>(value);
|
|
} else if (op == "!=") {
|
|
return parseBinaryFilter<NotEqualsFilter>(value);
|
|
} else if (op == ">") {
|
|
return parseBinaryFilter<GreaterThanFilter>(value);
|
|
} else if (op == ">=") {
|
|
return parseBinaryFilter<GreaterThanEqualsFilter>(value);
|
|
} else if (op == "<") {
|
|
return parseBinaryFilter<LessThanFilter>(value);
|
|
} else if (op == "<=") {
|
|
return parseBinaryFilter<LessThanEqualsFilter>(value);
|
|
} else if (op == "in") {
|
|
return parseSetFilter<InFilter>(value);
|
|
} else if (op == "!in") {
|
|
return parseSetFilter<NotInFilter>(value);
|
|
} else if (op == "all") {
|
|
return parseCompoundFilter<AllFilter>(value);
|
|
} else if (op == "any") {
|
|
return parseCompoundFilter<AnyFilter>(value);
|
|
} else if (op == "none") {
|
|
return parseCompoundFilter<NoneFilter>(value);
|
|
} else if (op == "has") {
|
|
return parseUnaryFilter<HasFilter>(value);
|
|
} else if (op == "!has") {
|
|
return parseUnaryFilter<NotHasFilter>(value);
|
|
} else {
|
|
Log::Warning(Event::ParseStyle, "filter operator must be one of \"==\", \"!=\", \">\", \">=\", \"<\", \"<=\", \"in\", \"!in\", \"all\", \"any\", \"none\", \"has\", or \"!has\"");
|
|
return empty;
|
|
}
|
|
}
|
|
|
|
std::vector<FontStack> Parser::fontStacks() const {
|
|
std::set<FontStack> result;
|
|
|
|
for (const auto& layer : layers) {
|
|
if (layer->is<SymbolLayer>()) {
|
|
PropertyValue<FontStack> textFont = layer->as<SymbolLayer>()->getTextFont();
|
|
if (textFont.isUndefined()) {
|
|
result.insert({"Open Sans Regular", "Arial Unicode MS Regular"});
|
|
} else if (textFont.isConstant()) {
|
|
result.insert(textFont.asConstant());
|
|
} else if (textFont.isFunction()) {
|
|
for (const auto& stop : textFont.asFunction().getStops()) {
|
|
result.insert(stop.second);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return std::vector<FontStack>(result.begin(), result.end());
|
|
}
|
|
|
|
} // namespace style
|
|
} // namespace mbgl
|