summaryrefslogtreecommitdiff
path: root/src/mbgl/style/parser.cpp
blob: eddda5d3f2406380ef1665bdb01d8aa748f99fca (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
#include <mbgl/style/parser.hpp>
#include <mbgl/style/sources/raster_source_impl.hpp>
#include <mbgl/style/sources/vector_source_impl.hpp>
#include <mbgl/style/sources/geojson_source_impl.hpp>
#include <mbgl/style/layer_impl.hpp>
#include <mbgl/style/layers/fill_layer.hpp>
#include <mbgl/style/layers/line_layer.hpp>
#include <mbgl/style/layers/circle_layer.hpp>
#include <mbgl/style/layers/symbol_layer.hpp>
#include <mbgl/style/layers/raster_layer.hpp>
#include <mbgl/style/layers/background_layer.hpp>
#include <mbgl/style/rapidjson_conversion.hpp>
#include <mbgl/style/conversion.hpp>

#include <mbgl/platform/log.hpp>

#include <mbgl/tile/geometry_tile_data.hpp>
#include <mbgl/util/enum.hpp>
#include <mbgl/util/tileset.hpp>

#include <rapidjson/document.h>
#include <rapidjson/error/en.h>

#include <algorithm>
#include <set>

namespace mbgl {
namespace style {

Parser::~Parser() = default;

void Parser::parse(const std::string& json) {
    rapidjson::GenericDocument<rapidjson::UTF8<>, rapidjson::CrtAllocator> document;
    document.Parse<0>(json.c_str());

    if (document.HasParseError()) {
        Log::Error(Event::ParseStyle, "Error parsing style JSON at %i: %s", document.GetErrorOffset(), rapidjson::GetParseError_En(document.GetParseError()));
        return;
    }

    if (document.HasMember("version")) {
        int version = document["version"].GetInt();
        if (version != 8) {
            Log::Warning(Event::ParseStyle, "current renderer implementation only supports style spec version 8; using an outdated style will cause rendering errors");
        }
    }

    if (document.HasMember("sources")) {
        parseSources(document["sources"]);
    }

    if (document.HasMember("layers")) {
        parseLayers(document["layers"]);
    }

    if (document.HasMember("sprite")) {
        const JSValue& sprite = document["sprite"];
        if (sprite.IsString()) {
            spriteURL = { sprite.GetString(), sprite.GetStringLength() };
        }
    }

    if (document.HasMember("glyphs")) {
        const JSValue& glyphs = document["glyphs"];
        if (glyphs.IsString()) {
            glyphURL = { glyphs.GetString(), glyphs.GetStringLength() };
        }
    }
}

void Parser::parseSources(const JSValue& value) {
    if (!value.IsObject()) {
        Log::Warning(Event::ParseStyle, "sources must be an object");
        return;
    }

    JSValue::ConstMemberIterator itr = value.MemberBegin();
    for (; itr != value.MemberEnd(); ++itr) {
        const JSValue& nameVal = itr->name;
        const JSValue& sourceVal = itr->value;

        if (!sourceVal.HasMember("type")) {
            Log::Warning(Event::ParseStyle, "source must have a type");
            continue;
        }

        const JSValue& typeVal = sourceVal["type"];
        if (!typeVal.IsString()) {
            Log::Warning(Event::ParseStyle, "source type must be a string");
            continue;
        }

        const auto type = Enum<SourceType>::toEnum({ typeVal.GetString(), typeVal.GetStringLength() });
        if (!type) {
            Log::Warning(Event::ParseStyle, "source type must have one of the enum values");
            continue;
        }

        const std::string id { nameVal.GetString(), nameVal.GetStringLength() };
        std::unique_ptr<Source> source;

        switch (*type) {
        case SourceType::Raster: {
            source = RasterSource::Impl::parse(id, sourceVal);
            break;
        }

        case SourceType::Vector:
            source = VectorSource::Impl::parse(id, sourceVal);
            break;

        case SourceType::GeoJSON:
            source = GeoJSONSource::Impl::parse(id, sourceVal);
            break;

        default:
            Log::Error(Event::ParseStyle, "source type '%s' is not supported", typeVal.GetString());
            continue;
        }

        if (source) {
            sourcesMap.emplace(id, source.get());
            sources.emplace_back(std::move(source));
        }
    }
}

void Parser::parseLayers(const JSValue& value) {
    std::vector<std::string> ids;

    if (!value.IsArray()) {
        Log::Warning(Event::ParseStyle, "layers must be an array");
        return;
    }

    for (rapidjson::SizeType i = 0; i < value.Size(); ++i) {
        const JSValue& layerValue = value[i];

        if (!layerValue.IsObject()) {
            Log::Warning(Event::ParseStyle, "layer must be an object");
            continue;
        }

        if (!layerValue.HasMember("id")) {
            Log::Warning(Event::ParseStyle, "layer must have an id");
            continue;
        }

        const JSValue& id = layerValue["id"];
        if (!id.IsString()) {
            Log::Warning(Event::ParseStyle, "layer id must be a string");
            continue;
        }

        const std::string layerID = { id.GetString(), id.GetStringLength() };
        if (layersMap.find(layerID) != layersMap.end()) {
            Log::Warning(Event::ParseStyle, "duplicate layer id %s", layerID.c_str());
            continue;
        }

        layersMap.emplace(layerID, std::pair<const JSValue&, std::unique_ptr<Layer>> { layerValue, nullptr });
        ids.push_back(layerID);
    }

    for (const auto& id : ids) {
        auto it = layersMap.find(id);

        parseLayer(it->first,
                   it->second.first,
                   it->second.second);
    }

    for (const auto& id : ids) {
        auto it = layersMap.find(id);

        if (it->second.second) {
            layers.emplace_back(std::move(it->second.second));
        }
    }
}

void Parser::parseLayer(const std::string& id, const JSValue& value, std::unique_ptr<Layer>& layer) {
    if (layer) {
        // Skip parsing this again. We already have a valid layer definition.
        return;
    }

    // Make sure we have not previously attempted to parse this layer.
    if (std::find(stack.begin(), stack.end(), id) != stack.end()) {
        Log::Warning(Event::ParseStyle, "layer reference of '%s' is circular", id.c_str());
        return;
    }

    if (value.HasMember("ref")) {
        // This layer is referencing another layer. Recursively parse that layer.
        const JSValue& refVal = value["ref"];
        if (!refVal.IsString()) {
            Log::Warning(Event::ParseStyle, "layer ref of '%s' must be a string", id.c_str());
            return;
        }

        const std::string ref { refVal.GetString(), refVal.GetStringLength() };
        auto it = layersMap.find(ref);
        if (it == layersMap.end()) {
            Log::Warning(Event::ParseStyle, "layer '%s' references unknown layer %s", id.c_str(), ref.c_str());
            return;
        }

        // Recursively parse the referenced layer.
        stack.push_front(id);
        parseLayer(it->first,
                   it->second.first,
                   it->second.second);
        stack.pop_front();

        Layer* reference = it->second.second.get();
        if (!reference) {
            return;
        }

        layer = reference->copy(id, ref);
        layer->baseImpl->parsePaints(value);
    } else {
        // Otherwise, parse the source/source-layer/filter/render keys to form the bucket.
        if (!value.HasMember("type")) {
            Log::Warning(Event::ParseStyle, "layer '%s' is missing a type", id.c_str());
            return;
        }

        const JSValue& typeVal = value["type"];
        if (!typeVal.IsString()) {
            Log::Warning(Event::ParseStyle, "layer '%s' has an invalid type", id.c_str());
            return;
        }

        std::string type { typeVal.GetString(), typeVal.GetStringLength() };

        if (type == "fill") {
            layer = std::make_unique<FillLayer>(id);
        } else if (type == "line") {
            layer = std::make_unique<LineLayer>(id);
        } else if (type == "circle") {
            layer = std::make_unique<CircleLayer>(id);
        } else if (type == "symbol") {
            layer = std::make_unique<SymbolLayer>(id);
        } else if (type == "raster") {
            layer = std::make_unique<RasterLayer>(id);
        } else if (type == "background") {
            layer = std::make_unique<BackgroundLayer>(id);
        } else {
            Log::Warning(Event::ParseStyle, "unknown type '%s' for layer '%s'", type.c_str(), id.c_str());
            return;
        }

        Layer::Impl* impl = layer->baseImpl.get();

        if (value.HasMember("source")) {
            const JSValue& value_source = value["source"];
            if (value_source.IsString()) {
                impl->source = { value_source.GetString(), value_source.GetStringLength() };
                auto source_it = sourcesMap.find(impl->source);
                if (source_it == sourcesMap.end()) {
                    Log::Warning(Event::ParseStyle, "can't find source '%s' required for layer '%s'", impl->source.c_str(), impl->id.c_str());
                }
            } else {
                Log::Warning(Event::ParseStyle, "source of layer '%s' must be a string", impl->id.c_str());
            }
        }

        if (value.HasMember("source-layer")) {
            const JSValue& value_source_layer = value["source-layer"];
            if (value_source_layer.IsString()) {
                impl->sourceLayer = { value_source_layer.GetString(), value_source_layer.GetStringLength() };
            } else {
                Log::Warning(Event::ParseStyle, "source-layer of layer '%s' must be a string", impl->id.c_str());
            }
        }

        if (value.HasMember("filter")) {
            conversion::Result<Filter> filter = conversion::convertFilter(value["filter"]);
            if (filter.is<Filter>()) {
                impl->filter = filter.get<Filter>();
            } else {
                Log::Warning(Event::ParseStyle, filter.get<conversion::Error>().message);
            }
        }

        if (value.HasMember("minzoom")) {
            const JSValue& min_zoom = value["minzoom"];
            if (min_zoom.IsNumber()) {
                impl->minZoom = min_zoom.GetDouble();
            } else {
                Log::Warning(Event::ParseStyle, "minzoom of layer %s must be numeric", impl->id.c_str());
            }
        }

        if (value.HasMember("maxzoom")) {
            const JSValue& max_zoom = value["maxzoom"];
            if (max_zoom.IsNumber()) {
                impl->maxZoom = max_zoom.GetDouble();
            } else {
                Log::Warning(Event::ParseStyle, "maxzoom of layer %s must be numeric", impl->id.c_str());
            }
        }

        if (value.HasMember("layout")) {
            parseVisibility(*layer, value["layout"]);
            impl->parseLayout(value["layout"]);
        }

        impl->parsePaints(value);
    }
}

void Parser::parseVisibility(Layer& layer, const JSValue& value) {
    Layer::Impl& impl = *layer.baseImpl;

    if (!value.HasMember("visibility")) {
        return;
    }

    if (!value["visibility"].IsString()) {
        Log::Warning(Event::ParseStyle, "value of 'visibility' must be a string");
        return;
    }

    const auto enumValue = Enum<VisibilityType>::toEnum({ value["visibility"].GetString(), value["visibility"].GetStringLength() });
    if (!enumValue) {
        Log::Warning(Event::ParseStyle, "value of 'visibility' must be a valid enumeration value");
        return;
    }

    impl.visibility = *enumValue;
}

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