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adds support for writing hextuples, fixes #44. #45

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adds support for writing hextuples, fixes #44. #45

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ad7e911
adds support for writing hextuples, fixes #44.
loki42 Sep 7, 2024
3f29150
run clang format, fix debugging code I left in and check some return …
loki42 Sep 9, 2024
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1 change: 1 addition & 0 deletions include/serd/serd.h
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Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,7 @@ typedef enum {
SERD_NTRIPLES = 2U, ///< Line-based triples http://www.w3.org/TR/n-triples/
SERD_NQUADS = 3U, ///< Line-based quads http://www.w3.org/TR/n-quads/
SERD_TRIG = 4U, ///< Terse quads http://www.w3.org/TR/trig/
SERD_HEXTUPLES = 5U, ///< ndjson hex tuples https://github.com/ontola/hextuples
} SerdSyntax;

/// Flags indicating certain string properties relevant to serialisation
Expand Down
95 changes: 86 additions & 9 deletions src/writer.c
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Original file line number Diff line number Diff line change
Expand Up @@ -145,7 +145,8 @@ write_node(SerdWriter* writer,
SERD_NODISCARD static bool
supports_abbrev(const SerdWriter* writer)
{
return writer->syntax == SERD_TURTLE || writer->syntax == SERD_TRIG;
return writer->syntax == SERD_TURTLE || writer->syntax == SERD_TRIG ||
writer->syntax == SERD_HEXTUPLES;
}

static SerdStatus
Expand Down Expand Up @@ -704,20 +705,35 @@ write_uri_node(SerdWriter* const writer,
if (supports_abbrev(writer)) {
if (field == FIELD_PREDICATE &&
!strcmp((const char*)node->buf, NS_RDF "type")) {
return esink("a", 1, writer);
if (writer->syntax == SERD_HEXTUPLES) {
return esink("\"a\"", 3, writer);
} else {
return esink("a", 1, writer);
}
}

if (!strcmp((const char*)node->buf, NS_RDF "nil")) {
return esink("()", 2, writer);
if (writer->syntax == SERD_HEXTUPLES) {
return esink("null", 4, writer);
} else {
return esink("()", 2, writer);
}
}

if (has_scheme && (writer->style & SERD_STYLE_CURIED) &&
serd_env_qualify(writer->env, node, &prefix, &suffix) &&
is_name(prefix.buf, prefix.n_bytes) &&
is_name(suffix.buf, suffix.len)) {
if (writer->syntax == SERD_HEXTUPLES) {
TRY(st, esink("\"", 1, writer));
}
TRY(st, write_uri_from_node(writer, &prefix));
TRY(st, esink(":", 1, writer));
return ewrite_uri(writer, suffix.buf, suffix.len);
TRY(st, ewrite_uri(writer, suffix.buf, suffix.len));
if (writer->syntax == SERD_HEXTUPLES) {
TRY(st, esink("\"", 1, writer));
}
return st;
}
}

Expand All @@ -730,7 +746,11 @@ write_uri_node(SerdWriter* const writer,
node->buf);
}

TRY(st, esink("<", 1, writer));
if (writer->syntax == SERD_HEXTUPLES) {
TRY(st, esink("\"", 1, writer));
} else {
TRY(st, esink("<", 1, writer));
}

if (writer->style & SERD_STYLE_RESOLVED) {
SerdURI in_base_uri;
Expand All @@ -745,7 +765,7 @@ write_uri_node(SerdWriter* const writer,
SerdURI* root = rooted ? &writer->root_uri : &writer->base_uri;
UriSinkContext ctx = {writer, SERD_SUCCESS};
if (!uri_is_under(&abs_uri, root) || writer->syntax == SERD_NTRIPLES ||
writer->syntax == SERD_NQUADS) {
writer->syntax == SERD_NQUADS || writer->syntax == SERD_HEXTUPLES) {
serd_uri_serialise(&abs_uri, uri_sink, &ctx);
} else {
serd_uri_serialise_relative(
Expand All @@ -755,7 +775,17 @@ write_uri_node(SerdWriter* const writer,
TRY(st, write_uri_from_node(writer, node));
}

return esink(">", 1, writer);
if (writer->syntax == SERD_HEXTUPLES) {
if (field == FIELD_PREDICATE || field == FIELD_SUBJECT) {
return esink("\"", 1, writer);
} else {
TRY(st, esink("\"", 1, writer));
TRY(st, write_sep(writer, SEP_LIST_END));
return st;
}
} else {
return esink(">", 1, writer);
}
}

SERD_NODISCARD static SerdStatus
Expand Down Expand Up @@ -812,6 +842,10 @@ write_blank(SerdWriter* const writer,
}
}

if (writer->syntax == SERD_HEXTUPLES) {
TRY(st, esink("\"", 1, writer));
}

TRY(st, esink("_:", 2, writer));
if (writer->bprefix && !strncmp((const char*)node->buf,
(const char*)writer->bprefix,
Expand All @@ -823,6 +857,9 @@ write_blank(SerdWriter* const writer,
} else {
TRY(st, esink(node->buf, node->n_bytes, writer));
}
if (writer->syntax == SERD_HEXTUPLES) {
TRY(st, esink("\"", 1, writer));
}

return st;
}
Expand Down Expand Up @@ -945,6 +982,41 @@ serd_writer_write_statement(SerdWriter* writer,
}
TRY(st, esink(" .\n", 3, writer));
return SERD_SUCCESS;
} else if (writer->syntax == SERD_HEXTUPLES) {
TRY(st, esink("[", 1, writer));
TRY(st, write_node(writer, subject, NULL, NULL, FIELD_SUBJECT, flags));
TRY(st, esink(", ", 2, writer));
TRY(st, write_node(writer, predicate, NULL, NULL, FIELD_PREDICATE, flags));
TRY(st, esink(", ", 2, writer));
// object
TRY(st, esink("\"", 1, writer));
TRY(st, write_text(writer, WRITE_STRING, object->buf, object->n_bytes));
st = esink("\"", 1, writer);

TRY(st, esink(", ", 2, writer));
// datatype
if (datatype && datatype->buf) {
TRY(st, write_node(writer, datatype, NULL, NULL, FIELD_NONE, flags));
} else {
TRY(st, esink("\"\"", 2, writer));
}
TRY(st, esink(", ", 2, writer));
// lang
TRY(st, esink("\"", 1, writer));
if (lang && lang->buf) {
TRY(st, esink(lang->buf, lang->n_bytes, writer));
}
TRY(st, esink("\"", 1, writer));

TRY(st, esink(", ", 2, writer));
TRY(st, esink("\"", 1, writer));
if (graph) {
TRY(st, write_node(writer, graph, datatype, lang, FIELD_GRAPH, flags));
}
TRY(st, esink("\"", 1, writer));
/* TRY(st, esink("]\n", 3, writer)); */
TRY(st, esink("]\n", 2, writer));
return SERD_SUCCESS;
}

SERD_DISABLE_NULL_WARNINGS
Expand All @@ -968,7 +1040,11 @@ serd_writer_write_statement(SerdWriter* writer,
// Continue a list
if (!strcmp((const char*)predicate->buf, NS_RDF "first") &&
!strcmp((const char*)object->buf, NS_RDF "nil")) {
return esink("()", 2, writer);
if (writer->syntax == SERD_HEXTUPLES) {
return esink("null", 4, writer);
} else {
return esink("()", 2, writer);
}
}

TRY_FAILING(
Expand Down Expand Up @@ -1070,7 +1146,8 @@ serd_writer_end_anon(SerdWriter* writer, const SerdNode* node)

SerdStatus st = SERD_SUCCESS;

if (writer->syntax == SERD_NTRIPLES || writer->syntax == SERD_NQUADS) {
if (writer->syntax == SERD_NTRIPLES || writer->syntax == SERD_NQUADS ||
writer->syntax == SERD_HEXTUPLES) {
return SERD_SUCCESS;
}

Expand Down