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mapnik_map_from_string.cpp
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205 lines (183 loc) · 5.97 KB
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#include "mapnik_map.hpp"
#include <mapnik/load_map.hpp> // for load_map, load_map_string
#include <mapnik/map.hpp> // for Map, etc
namespace detail {
struct AsyncMapFromString : Napi::AsyncWorker
{
using Base = Napi::AsyncWorker;
AsyncMapFromString(map_ptr const& map, std::string const& stylesheet,
std::string const& base_path, bool strict, Napi::Function const& callback)
: Base(callback),
map_(map),
stylesheet_(stylesheet),
base_path_(base_path),
strict_(strict) {}
void Execute() override
{
try
{
mapnik::load_map_string(*map_, stylesheet_, strict_, base_path_);
}
catch (std::exception const& ex)
{
SetError(ex.what());
}
}
std::vector<napi_value> GetResult(Napi::Env env) override
{
if (map_)
{
Napi::Value arg = Napi::External<map_ptr>::New(env, &map_);
Napi::Object obj = Map::constructor.New({arg});
return {env.Null(), napi_value(obj)};
}
return Base::GetResult(env);
}
private:
map_ptr map_;
std::string stylesheet_;
std::string base_path_;
bool strict_;
};
} // namespace detail
/**
* Load styles, layers, and other information for this map from a Mapnik
* XML stylesheet given as a string.
*
* @memberof Map
* @instance
* @name fromStringSync
* @param {string} stylesheet contents
* @param {Object} [options={}]
* @example
* var fs = require('fs');
* map.fromStringSync(fs.readFileSync('./style.xml', 'utf8'));
*/
Napi::Value Map::fromStringSync(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
if (info.Length() < 1)
{
Napi::Error::New(env, "Accepts 2 arguments: stylesheet string and an optional options").ThrowAsJavaScriptException();
return env.Undefined();
}
if (!info[0].IsString())
{
Napi::TypeError::New(env, "first argument must be a mapnik stylesheet string").ThrowAsJavaScriptException();
return env.Undefined();
}
// defaults
bool strict = false;
std::string base_path("");
if (info.Length() >= 2)
{
// ensure options object
if (!info[1].IsObject())
{
Napi::TypeError::New(env, "options must be an object, eg {strict: true, base: \".\"'}").ThrowAsJavaScriptException();
return env.Undefined();
}
Napi::Object options = info[1].As<Napi::Object>();
if (options.Has("strict"))
{
Napi::Value strict_val = options.Get("strict");
if (!strict_val.IsBoolean())
{
Napi::TypeError::New(env, "'strict' must be a Boolean").ThrowAsJavaScriptException();
return env.Undefined();
}
strict = strict_val.As<Napi::Boolean>();
}
if (options.Has("base"))
{
Napi::Value base_val = options.Get("base");
if (!base_val.IsString())
{
Napi::TypeError::New(env, "'base' must be a string representing a filesystem path").ThrowAsJavaScriptException();
return env.Undefined();
}
base_path = base_val.As<Napi::String>();
}
}
std::string stylesheet = info[0].As<Napi::String>();
try
{
mapnik::load_map_string(*map_, stylesheet, strict, base_path);
}
catch (std::exception const& ex)
{
Napi::Error::New(env, ex.what()).ThrowAsJavaScriptException();
}
return env.Undefined();
}
/**
* Load styles, layers, and other information for this map from a Mapnik
* XML stylesheet given as a string.
*
* @memberof Map
* @instance
* @name fromString
* @param {string} stylesheet contents
* @param {Object} [options={}]
* @param {Function} callback
* @example
* var fs = require('fs');
* map.fromString(fs.readFileSync('./style.xml', 'utf8'), function(err, res) {
* // details loaded
* });
*/
Napi::Value Map::fromString(Napi::CallbackInfo const& info)
{
Napi::Env env = info.Env();
if (info.Length() < 2)
{
Napi::Error::New(env, "please provide a stylesheet string, options, and callback").ThrowAsJavaScriptException();
return env.Undefined();
}
// ensure stylesheet path is a string
Napi::Value stylesheet = info[0];
if (!stylesheet.IsString())
{
Napi::TypeError::New(env, "first argument must be a path to a mapnik stylesheet string").ThrowAsJavaScriptException();
return env.Undefined();
}
// ensure callback is a function
Napi::Value callback_val = info[info.Length() - 1];
if (!callback_val.IsFunction())
{
Napi::TypeError::New(env, "last argument must be a callback function").ThrowAsJavaScriptException();
return env.Undefined();
}
// ensure options object
if (!info[1].IsObject())
{
Napi::TypeError::New(env, "options must be an object, eg {strict: true, base: \".\"'}").ThrowAsJavaScriptException();
return env.Undefined();
}
Napi::Object options = info[1].As<Napi::Object>();
bool strict = false;
if (options.Has("strict"))
{
Napi::Value strict_val = options.Get("strict");
if (!strict_val.IsBoolean())
{
Napi::TypeError::New(env, "'strict' must be a Boolean").ThrowAsJavaScriptException();
return env.Undefined();
}
strict = strict_val.As<Napi::Boolean>();
}
std::string base_path = "";
if (options.Has("base"))
{
Napi::Value base_val = options.Get("base");
if (!base_val.IsString())
{
Napi::TypeError::New(env, "'base' must be a string representing a filesystem path").ThrowAsJavaScriptException();
return env.Undefined();
}
base_path = base_val.As<Napi::String>();
}
auto* worker = new detail::AsyncMapFromString(map_, stylesheet.As<Napi::String>(), base_path, strict, callback_val.As<Napi::Function>());
worker->Queue();
return env.Undefined();
}