279 lines
8.4 KiB
C++
279 lines
8.4 KiB
C++
#include <mbgl/style/parser.hpp>
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#include <mbgl/style/layer_impl.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/source.hpp>
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#include <mbgl/style/conversion/layer.hpp>
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#include <mbgl/style/conversion/light.hpp>
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#include <mbgl/util/logging.hpp>
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#include <mapbox/geojsonvt.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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#include <sstream>
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namespace mbgl {
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namespace style {
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Parser::~Parser() = default;
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StyleParseResult 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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std::stringstream message;
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message << document.GetErrorOffset() << " - "
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<< rapidjson::GetParseError_En(document.GetParseError());
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return std::make_exception_ptr(std::runtime_error(message.str()));
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}
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if (!document.IsObject()) {
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return std::make_exception_ptr(std::runtime_error("style must be an object"));
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}
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if (document.HasMember("version")) {
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const JSValue& versionValue = document["version"];
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const int version = versionValue.IsNumber() ? versionValue.GetInt() : 0;
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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("name")) {
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const JSValue& value = document["name"];
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if (value.IsString()) {
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name = { value.GetString(), value.GetStringLength() };
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}
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}
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if (document.HasMember("center")) {
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const JSValue& value = document["center"];
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if (value.IsArray() && value.Size() >= 2) {
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// Style spec uses lon/lat order
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latLng = LatLng(value[1].IsNumber() ? value[1].GetDouble() : 0,
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value[0].IsNumber() ? value[0].GetDouble() : 0);
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}
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}
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if (document.HasMember("zoom")) {
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const JSValue& value = document["zoom"];
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if (value.IsNumber()) {
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zoom = value.GetDouble();
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}
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}
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if (document.HasMember("bearing")) {
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const JSValue& value = document["bearing"];
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if (value.IsNumber()) {
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bearing = value.GetDouble();
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}
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}
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if (document.HasMember("pitch")) {
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const JSValue& value = document["pitch"];
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if (value.IsNumber()) {
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pitch = value.GetDouble();
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}
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}
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if (document.HasMember("light")) {
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parseLight(document["light"]);
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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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return nullptr;
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}
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void Parser::parseLight(const JSValue& value) {
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conversion::Error error;
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optional<Light> converted = conversion::convert<Light>(value, error);
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if (!converted) {
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Log::Warning(Event::ParseStyle, error.message);
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return;
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}
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light = std::move(*converted);
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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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for (const auto& property : value.GetObject()) {
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std::string id = *conversion::toString(property.name);
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conversion::Error error;
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optional<std::unique_ptr<Source>> source =
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conversion::convert<std::unique_ptr<Source>>(property.value, error, id);
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if (!source) {
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Log::Warning(Event::ParseStyle, error.message);
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continue;
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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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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 (auto& layerValue : value.GetArray()) {
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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->cloneRef(id);
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conversion::setPaintProperties(*layer, value);
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} else {
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conversion::Error error;
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optional<std::unique_ptr<Layer>> converted = conversion::convert<std::unique_ptr<Layer>>(value, error);
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if (!converted) {
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Log::Warning(Event::ParseStyle, error.message);
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return;
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}
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layer = std::move(*converted);
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}
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}
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std::vector<FontStack> Parser::fontStacks() const {
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std::set<FontStack> optional;
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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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optional.insert({"Open Sans Regular", "Arial Unicode MS Regular"});
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} else if (textFont.isConstant()) {
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optional.insert(textFont.asConstant());
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} else if (textFont.isCameraFunction()) {
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textFont.asCameraFunction().stops.match(
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[&] (const auto& stops) {
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for (const auto& stop : stops.stops) {
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optional.insert(stop.second);
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}
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}
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);
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}
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}
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}
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return std::vector<FontStack>(optional.begin(), optional.end());
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}
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} // namespace style
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} // namespace mbgl
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