diff options
Diffstat (limited to 'src/TurtleWriter.cpp')
| -rw-r--r-- | src/TurtleWriter.cpp | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/TurtleWriter.cpp b/src/TurtleWriter.cpp new file mode 100644 index 00000000..368184d4 --- /dev/null +++ b/src/TurtleWriter.cpp @@ -0,0 +1,101 @@ +/* + This file is part of Ingen. + Copyright 2012-2016 David Robillard <http://drobilla.net/> + + Ingen is free software: you can redistribute it and/or modify it under the + terms of the GNU Affero General Public License as published by the Free + Software Foundation, either version 3 of the License, or any later version. + + Ingen is distributed in the hope that it will be useful, but WITHOUT ANY + WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR + A PARTICULAR PURPOSE. See the GNU Affero General Public License for details. + + You should have received a copy of the GNU Affero General Public License + along with Ingen. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "ingen/TurtleWriter.hpp" +#include "ingen/URIMap.hpp" + +#define USTR(s) ((const uint8_t*)(s)) + +namespace Ingen { + +static size_t +c_text_sink(const void* buf, size_t len, void* stream) +{ + TurtleWriter* writer = (TurtleWriter*)stream; + return writer->text_sink(buf, len); +} + +static SerdStatus +write_prefix(void* handle, const SerdNode* name, const SerdNode* uri) +{ + serd_writer_set_prefix((SerdWriter*)handle, name, uri); + return SERD_SUCCESS; +} + +TurtleWriter::TurtleWriter(URIMap& map, URIs& uris, const URI& uri) + : AtomWriter(map, uris, *this) + , _map(map) + , _sratom(sratom_new(&map.urid_map_feature()->urid_map)) + , _uri(uri) + , _wrote_prefixes(false) +{ + // Use <ingen:/> as base URI, so relative URIs are like bundle paths + _base = serd_node_from_string(SERD_URI, (const uint8_t*)"ingen:/"); + serd_uri_parse(_base.buf, &_base_uri); + + // Set up serialisation environment + _env = serd_env_new(&_base); + serd_env_set_prefix_from_strings(_env, USTR("atom"), USTR("http://lv2plug.in/ns/ext/atom#")); + serd_env_set_prefix_from_strings(_env, USTR("doap"), USTR("http://usefulinc.com/ns/doap#")); + serd_env_set_prefix_from_strings(_env, USTR("ingen"), USTR(INGEN_NS)); + serd_env_set_prefix_from_strings(_env, USTR("lv2"), USTR("http://lv2plug.in/ns/lv2core#")); + serd_env_set_prefix_from_strings(_env, USTR("midi"), USTR("http://lv2plug.in/ns/ext/midi#")); + serd_env_set_prefix_from_strings(_env, USTR("owl"), USTR("http://www.w3.org/2002/07/owl#")); + serd_env_set_prefix_from_strings(_env, USTR("patch"), USTR("http://lv2plug.in/ns/ext/patch#")); + serd_env_set_prefix_from_strings(_env, USTR("rdf"), USTR("http://www.w3.org/1999/02/22-rdf-syntax-ns#")); + serd_env_set_prefix_from_strings(_env, USTR("rdfs"), USTR("http://www.w3.org/2000/01/rdf-schema#")); + serd_env_set_prefix_from_strings(_env, USTR("xsd"), USTR("http://www.w3.org/2001/XMLSchema#")); + + // Make a Turtle writer that writes to text_sink + _writer = serd_writer_new( + SERD_TURTLE, + (SerdStyle)(SERD_STYLE_RESOLVED|SERD_STYLE_ABBREVIATED|SERD_STYLE_CURIED), + _env, + &_base_uri, + c_text_sink, + this); + + // Configure sratom to write directly to the writer (and thus text_sink) + sratom_set_sink(_sratom, + (const char*)_base.buf, + (SerdStatementSink)serd_writer_write_statement, + (SerdEndSink)serd_writer_end_anon, + _writer); +} + +TurtleWriter::~TurtleWriter() +{ + sratom_free(_sratom); + serd_writer_free(_writer); + serd_env_free(_env); +} + +bool +TurtleWriter::write(const LV2_Atom* msg, int32_t default_id) +{ + if (!_wrote_prefixes) { + // Write namespace prefixes once to reduce traffic + serd_env_foreach(_env, write_prefix, _writer); + _wrote_prefixes = true; + } + + sratom_write(_sratom, &_map.urid_unmap_feature()->urid_unmap, 0, + nullptr, nullptr, msg->type, msg->size, LV2_ATOM_BODY_CONST(msg)); + serd_writer_finish(_writer); + return true; +} + +} // namespace Ingen |