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-rw-r--r--ChangeLog1
-rw-r--r--serd/serd.h5
-rw-r--r--src/reader.c96
-rw-r--r--src/writer.c201
-rw-r--r--tests/test-07.out2
-rw-r--r--tests/test-blank-in-list.out4
-rw-r--r--tests/test-blank-in-list.ttl2
-rw-r--r--tests/test-list-in-blank.out6
-rw-r--r--tests/test-list-in-blank.ttl2
-rw-r--r--tests/test-list-subject.out5
-rw-r--r--tests/test-list-subject.ttl1
-rw-r--r--tests/test-pretty.out46
-rw-r--r--tests/test-pretty.ttl44
13 files changed, 319 insertions, 96 deletions
diff --git a/ChangeLog b/ChangeLog
index 2436cd74..3931764a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -24,6 +24,7 @@ serd (UNRELEASED) unstable; urgency=low
* Add serd_node_new_blob and serd_base64_decode for handling arbitrary
binary data via base64 encoding.
* Support compilation as C++ under MSVC++.
+ * Impement pretty-printing for collections.
-- David Robillard <d@drobilla.net> (UNRELEASED)
diff --git a/serd/serd.h b/serd/serd.h
index c69d0eaa..8cca4a3f 100644
--- a/serd/serd.h
+++ b/serd/serd.h
@@ -117,7 +117,10 @@ typedef enum {
SERD_EMPTY_O = 1 << 2, /**< Empty blank node object */
SERD_ANON_S_BEGIN = 1 << 3, /**< Start of anonymous subject */
SERD_ANON_O_BEGIN = 1 << 4, /**< Start of anonymous object */
- SERD_ANON_CONT = 1 << 5 /**< Continuation of anonymous node */
+ SERD_ANON_CONT = 1 << 5, /**< Continuation of anonymous node */
+ SERD_LIST_S_BEGIN = 1 << 6, /**< Start of list subject */
+ SERD_LIST_O_BEGIN = 1 << 7, /**< Start of list object */
+ SERD_LIST_CONT = 1 << 8 /**< Continuation of list */
} SerdStatementFlag;
/**
diff --git a/src/reader.c b/src/reader.c
index e365e45f..38d0c21a 100644
--- a/src/reader.c
+++ b/src/reader.c
@@ -277,7 +277,7 @@ emit_statement(SerdReader* reader, SerdStatementFlags* flags,
deref(reader, o),
deref(reader, d),
deref(reader, l));
- *flags = (*flags & SERD_ANON_CONT) ? SERD_ANON_CONT : 0;
+ *flags &= SERD_ANON_CONT|SERD_LIST_CONT; // Preserve only cont flags
return ret;
}
@@ -1008,7 +1008,7 @@ blank_id(SerdReader* reader)
static bool
read_blank(SerdReader* reader, ReadContext ctx, bool subject, Ref* dest)
{
- const bool was_anon_subject = subject && (*ctx.flags | SERD_ANON_CONT);
+ const SerdStatementFlags old_flags = *ctx.flags;
switch (peek_byte(reader)) {
case '_':
*dest = read_nodeID(reader);
@@ -1016,25 +1016,29 @@ read_blank(SerdReader* reader, ReadContext ctx, bool subject, Ref* dest)
case '[':
eat_byte_safe(reader, '[');
read_ws_star(reader);
- *dest = blank_id(reader);
- if (peek_byte(reader) == ']') {
- eat_byte_safe(reader, ']');
+
+ const bool empty = (peek_byte(reader) == ']');
+ if (empty) {
*ctx.flags |= (subject) ? SERD_EMPTY_S : SERD_EMPTY_O;
- if (ctx.subject) {
- TRY_RET(emit_statement(reader, ctx.flags,
- ctx.graph, ctx.subject, ctx.predicate,
- *dest, 0, 0));
- }
- return true;
+ } else {
+ *ctx.flags |= (subject) ? SERD_ANON_S_BEGIN : SERD_ANON_O_BEGIN;
}
- *ctx.flags |= (subject) ? SERD_ANON_S_BEGIN : SERD_ANON_O_BEGIN;
+ *dest = blank_id(reader);
if (ctx.subject) {
TRY_RET(emit_statement(reader, ctx.flags,
ctx.graph, ctx.subject, ctx.predicate,
*dest, 0, 0));
}
+
ctx.subject = *dest;
+ *ctx.flags &= ~(SERD_LIST_CONT);
+
+ if (empty) {
+ eat_byte_safe(reader, ']');
+ return true;
+ }
+
if (!subject) {
*ctx.flags |= SERD_ANON_CONT;
}
@@ -1044,20 +1048,10 @@ read_blank(SerdReader* reader, ReadContext ctx, bool subject, Ref* dest)
if (reader->end_sink) {
reader->end_sink(reader->handle, deref(reader, *dest));
}
- if (!was_anon_subject) {
- *ctx.flags &= ~SERD_ANON_CONT;
- }
+ *ctx.flags = old_flags;
return true;
case '(':
- if (read_collection(reader, ctx, dest)) {
- if (ctx.subject) {
- TRY_RET(emit_statement(reader, ctx.flags,
- ctx.graph, ctx.subject, ctx.predicate,
- *dest, 0, 0));
- }
- return true;
- }
- return false;
+ return read_collection(reader, ctx, dest);
default:
return error(reader, "illegal blank node\n");
}
@@ -1199,32 +1193,23 @@ static bool
read_collection_rec(SerdReader* reader, ReadContext ctx)
{
read_ws_star(reader);
- if (peek_byte(reader) == ')') {
+ const bool end = (peek_byte(reader) == ')');
+ const Ref rest = (end ? reader->rdf_nil : blank_id(reader));
+ *ctx.flags |= SERD_LIST_CONT;
+ TRY_RET(emit_statement(reader, ctx.flags, ctx.graph,
+ ctx.subject, reader->rdf_rest, rest, 0, 0));
+
+ if (end) {
eat_byte_safe(reader, ')');
- TRY_RET(emit_statement(reader, ctx.flags,
- 0,
- ctx.subject,
- reader->rdf_rest,
- reader->rdf_nil, 0, 0));
- return false;
} else {
- const Ref rest = blank_id(reader);
- TRY_RET(emit_statement(reader, ctx.flags,
- ctx.graph,
- ctx.subject,
- reader->rdf_rest,
- rest, 0, 0));
- ctx.subject = rest;
- ctx.predicate = reader->rdf_first;
+ ctx.subject = rest;
+ ctx.predicate = reader->rdf_first;
if (read_object(reader, ctx)) {
- read_collection_rec(reader, ctx);
- pop_node(reader, rest);
- return true;
- } else {
- pop_node(reader, rest);
- return false;
+ TRY_RET(read_collection_rec(reader, ctx));
}
}
+ *ctx.flags &= ~SERD_LIST_CONT;
+ return true;
}
// [22] itemList ::= object+
@@ -1232,22 +1217,33 @@ read_collection_rec(SerdReader* reader, ReadContext ctx)
static bool
read_collection(SerdReader* reader, ReadContext ctx, Ref* dest)
{
- TRY_RET(eat_byte_safe(reader, '('));
+ eat_byte_safe(reader, '(');
read_ws_star(reader);
- if (peek_byte(reader) == ')') { // Empty collection
- eat_byte_safe(reader, ')');
+
+ if (peek_byte(reader) == ')') {
*dest = reader->rdf_nil;
+ if (ctx.subject) {
+ TRY_RET(emit_statement(reader, ctx.flags, ctx.graph,
+ ctx.subject, ctx.predicate, *dest, 0, 0));
+ }
+ eat_byte_safe(reader, ')');
return true;
}
- *dest = blank_id(reader);
+ *dest = blank_id(reader);
+ *ctx.flags |= (!ctx.subject) ? SERD_LIST_S_BEGIN : SERD_LIST_O_BEGIN;
+
+ if (ctx.subject) {
+ TRY_RET(emit_statement(reader, ctx.flags, ctx.graph,
+ ctx.subject, ctx.predicate, *dest, 0, 0));
+ *ctx.flags = SERD_LIST_CONT;
+ }
ctx.subject = *dest;
ctx.predicate = reader->rdf_first;
if (!read_object(reader, ctx)) {
return error(reader, "unexpected end of collection\n");
}
- ctx.subject = *dest;
return read_collection_rec(reader, ctx);
}
diff --git a/src/writer.c b/src/writer.c
index 469e0090..84bd465b 100644
--- a/src/writer.c
+++ b/src/writer.c
@@ -36,6 +36,43 @@ static const WriteContext WRITE_CONTEXT_NULL = {
{ 0, 0, 0, 0, SERD_NOTHING }
};
+typedef enum {
+ SEP_NONE,
+ SEP_END_S, ///< End of a subject ('.')
+ SEP_END_P, ///< End of a predicate (';')
+ SEP_END_O, ///< End of an object (',')
+ SEP_S_P, ///< Between a subject and predicate (whitespace)
+ SEP_P_O, ///< Between a predicate and object (whitespace)
+ SEP_ANON_BEGIN, ///< Start of anonymous node ('[')
+ SEP_ANON_END, ///< End of anonymous node (']')
+ SEP_LIST_BEGIN, ///< Start of list ('(')
+ SEP_LIST_SEP, ///< List separator (whitespace)
+ SEP_LIST_END ///< End of list (')')
+} Sep;
+
+typedef struct {
+ const char* str; ///< Sep string
+ uint8_t len; ///< Length of sep string
+ uint8_t space_before; ///< Newline before sep
+ uint8_t space_after_node; ///< Newline after sep if after node
+ uint8_t space_after_sep; ///< Newline after sep if after sep
+} SepRule;
+
+static const SepRule rules[] = {
+ { NULL, 0, 0, 0, 0 },
+ { " .\n\n", 4, 0, 0, 0 },
+ { " ;", 2, 0, 1, 1 },
+ { " ,", 2, 0, 1, 0 },
+ { NULL, 0, 0, 1, 0 },
+ { " ", 1, 0, 0, 0 },
+ { "[", 1, 0, 1, 1 },
+ { "]", 1, 0, 0, 0 },
+ { "(", 1, 0, 0, 0 },
+ { NULL, 1, 0, 1, 0 },
+ { ")", 1, 1, 0, 0 },
+ { "\n", 1, 0, 1, 0 }
+};
+
struct SerdWriterImpl {
SerdSyntax syntax;
SerdStyle style;
@@ -46,9 +83,12 @@ struct SerdWriterImpl {
SerdSink sink;
void* stream;
WriteContext context;
+ SerdNode list_subj;
+ unsigned list_depth;
uint8_t* bprefix;
size_t bprefix_len;
unsigned indent;
+ Sep last_sep;
bool empty;
};
@@ -202,16 +242,8 @@ write_text(SerdWriter* writer, TextContext ctx,
}
static void
-serd_writer_write_delim(SerdWriter* writer, const uint8_t delim)
+write_newline(SerdWriter* writer)
{
- switch (delim) {
- case '\n':
- break;
- default:
- sink(" ", 1, writer);
- case '[':
- sink(&delim, 1, writer);
- }
sink("\n", 1, writer);
for (unsigned i = 0; i < writer->indent; ++i) {
sink("\t", 1, writer);
@@ -219,6 +251,25 @@ serd_writer_write_delim(SerdWriter* writer, const uint8_t delim)
}
static void
+write_sep(SerdWriter* writer, const Sep sep)
+{
+ const SepRule* rule = &rules[sep];
+ if (rule->space_before) {
+ write_newline(writer);
+ }
+ if (rule->str) {
+ sink(rule->str, rule->len, writer);
+ }
+ if ( (writer->last_sep && rule->space_after_sep)
+ || (!writer->last_sep && rule->space_after_node)) {
+ write_newline(writer);
+ } else if (writer->last_sep && rule->space_after_node) {
+ sink(" ", 1, writer);
+ }
+ writer->last_sep = sep;
+}
+
+static void
reset_context(SerdWriter* writer, bool del)
{
if (del) {
@@ -257,10 +308,22 @@ write_node(SerdWriter* writer,
&& ((field == FIELD_SUBJECT && (flags & SERD_ANON_S_BEGIN))
|| (field == FIELD_OBJECT && (flags & SERD_ANON_O_BEGIN)))) {
++writer->indent;
- serd_writer_write_delim(writer, '[');
+ write_sep(writer, SEP_ANON_BEGIN);
+ } else if (writer->syntax != SERD_NTRIPLES
+ && (field == FIELD_SUBJECT && (flags & SERD_LIST_S_BEGIN))) {
+ assert(writer->list_depth == 0);
+ copy_node(&writer->list_subj, node);
+ ++writer->list_depth;
+ ++writer->indent;
+ write_sep(writer, SEP_LIST_BEGIN);
+ } else if (writer->syntax != SERD_NTRIPLES
+ && (field == FIELD_OBJECT && (flags & SERD_LIST_O_BEGIN))) {
+ ++writer->indent;
+ ++writer->list_depth;
+ write_sep(writer, SEP_LIST_BEGIN);
} else if (writer->syntax != SERD_NTRIPLES
- && ((field == FIELD_SUBJECT && (flags & SERD_EMPTY_S))
- || (field == FIELD_OBJECT && (flags & SERD_EMPTY_O)))) {
+ && ((field == FIELD_SUBJECT && (flags & SERD_EMPTY_S))
+ || (field == FIELD_OBJECT && (flags & SERD_EMPTY_O)))) {
sink("[]", 2, writer);
} else {
sink("_:", 2, writer);
@@ -325,7 +388,11 @@ write_node(SerdWriter* writer,
if ((writer->syntax == SERD_TURTLE)
&& !strcmp((const char*)node->buf, NS_RDF "type")) {
sink("a", 1, writer);
- return true;
+ break;
+ } else if ((writer->syntax == SERD_TURTLE)
+ && !strcmp((const char*)node->buf, NS_RDF "nil")) {
+ sink("()", 2, writer);
+ break;
} else if ((writer->style & SERD_STYLE_CURIED)
&& serd_uri_string_has_scheme(node->buf)) {
SerdNode prefix;
@@ -334,7 +401,7 @@ write_node(SerdWriter* writer,
write_text(writer, WRITE_URI, prefix.buf, prefix.n_bytes, '>');
sink(":", 1, writer);
write_text(writer, WRITE_URI, suffix.buf, suffix.len, '>');
- return true;
+ break;
}
} else if ((writer->style & SERD_STYLE_RESOLVED)
&& !serd_uri_string_has_scheme(node->buf)) {
@@ -345,7 +412,7 @@ write_node(SerdWriter* writer,
sink("<", 1, writer);
serd_uri_serialise(&abs_uri, (SerdSink)sink, writer);
sink(">", 1, writer);
- return true;
+ break;
}
sink("<", 1, writer);
write_text(writer, WRITE_URI, node->buf, node->n_bytes, '>');
@@ -353,6 +420,7 @@ write_node(SerdWriter* writer,
default:
break;
}
+ writer->last_sep = SEP_NONE;
return true;
}
@@ -367,6 +435,45 @@ is_resource(const SerdNode* node)
}
}
+static void
+serd_writer_write_predicate(SerdWriter* writer,
+ SerdStatementFlags flags,
+ const SerdNode* predicate)
+{
+ if (!(flags & (SERD_LIST_CONT|SERD_LIST_S_BEGIN))) {
+ write_node(writer, predicate, NULL, NULL, FIELD_PREDICATE, flags);
+ write_sep(writer, SEP_P_O);
+ }
+ copy_node(&writer->context.predicate, predicate);
+}
+
+static bool
+serd_writer_write_object(SerdWriter* writer,
+ SerdStatementFlags flags,
+ const SerdNode* predicate,
+ const SerdNode* object,
+ const SerdNode* object_datatype,
+ const SerdNode* object_lang)
+{
+ if (!strcmp((const char*)object->buf, NS_RDF "nil")) {
+ if (flags & SERD_LIST_CONT) {
+ --writer->indent;
+ write_sep(writer, SEP_LIST_END);
+ return true;
+ } else {
+ sink("()", 2, writer);
+ }
+ } else if (strcmp((const char*)predicate->buf, NS_RDF "rest")) {
+ if (!strcmp((const char*)predicate->buf, NS_RDF "first")) {
+ write_sep(writer, SEP_LIST_SEP);
+ }
+
+ write_node(writer, object, object_datatype, object_lang,
+ FIELD_OBJECT, flags);
+ }
+ return false;
+}
+
SERD_API
SerdStatus
serd_writer_write_statement(SerdWriter* writer,
@@ -399,15 +506,15 @@ serd_writer_write_statement(SerdWriter* writer,
default:
break;
}
+
+ bool was_list_end = false;
if (serd_node_equals(subject, &writer->context.subject)) {
if (serd_node_equals(predicate, &writer->context.predicate)) {
// Abbreviate S P
- if ((flags & SERD_ANON_O_BEGIN)) {
- sink(" , ", 3, writer); // ] , [
- } else {
+ if (!(flags & SERD_ANON_O_BEGIN)) {
++writer->indent;
- serd_writer_write_delim(writer, ',');
}
+ write_sep(writer, SEP_END_O);
write_node(writer, object, object_datatype, object_lang,
FIELD_OBJECT, flags);
if (!(flags & SERD_ANON_O_BEGIN)) {
@@ -415,35 +522,34 @@ serd_writer_write_statement(SerdWriter* writer,
}
} else {
// Abbreviate S
- if (writer->context.predicate.type) {
- serd_writer_write_delim(writer, ';');
- } else {
- serd_writer_write_delim(writer, '\n');
+ if (!(flags & SERD_LIST_CONT)) {
+ write_sep(writer,
+ (writer->context.predicate.type
+ ? SEP_END_P : SEP_S_P));
}
- write_node(writer, predicate, NULL, NULL, FIELD_PREDICATE, flags);
- copy_node(&writer->context.predicate, predicate);
- sink(" ", 1, writer);
- write_node(writer, object, object_datatype, object_lang,
- FIELD_OBJECT, flags);
+
+ serd_writer_write_predicate(writer, flags, predicate);
+
+ was_list_end = serd_writer_write_object(
+ writer, flags, predicate, object, object_datatype, object_lang);
}
} else {
+ // No abbreviation
if (writer->context.subject.type) {
assert(writer->indent > 0);
--writer->indent;
- if (serd_stack_is_empty(&writer->anon_stack)) {
- serd_writer_write_delim(writer, '.');
- serd_writer_write_delim(writer, '\n');
+ if (serd_stack_is_empty(&writer->anon_stack)
+ && !(flags & SERD_LIST_CONT)) {
+ write_sep(writer, SEP_END_S);
}
} else if (!writer->empty) {
- serd_writer_write_delim(writer, '\n');
+ write_sep(writer, SEP_S_P);
}
- if (!(flags & SERD_ANON_CONT)) {
+ if (!(flags & (SERD_ANON_CONT|SERD_LIST_CONT))) {
write_node(writer, subject, NULL, NULL, FIELD_SUBJECT, flags);
++writer->indent;
- if (!(flags & SERD_ANON_S_BEGIN)) {
- serd_writer_write_delim(writer, '\n');
- }
+ write_sep(writer, SEP_S_P);
} else {
++writer->indent;
}
@@ -451,15 +557,19 @@ serd_writer_write_statement(SerdWriter* writer,
reset_context(writer, false);
copy_node(&writer->context.subject, subject);
- write_node(writer, predicate, NULL, NULL, FIELD_PREDICATE, flags);
- copy_node(&writer->context.predicate, predicate);
- sink(" ", 1, writer);
+ serd_writer_write_predicate(writer, flags, predicate);
- write_node(writer, object, object_datatype, object_lang,
- FIELD_OBJECT, flags);
+ was_list_end = serd_writer_write_object(
+ writer, flags, predicate, object, object_datatype, object_lang);
}
- if ((flags & SERD_ANON_S_BEGIN) || (flags & SERD_ANON_O_BEGIN)) {
+ if (was_list_end) {
+ if (--writer->list_depth == 0 && writer->list_subj.type) {
+ reset_context(writer, false);
+ writer->context.subject = writer->list_subj;
+ writer->list_subj = SERD_NODE_NULL;
+ }
+ } else if (flags & (SERD_ANON_S_BEGIN|SERD_ANON_O_BEGIN)) {
WriteContext* ctx = (WriteContext*)serd_stack_push(
&writer->anon_stack, sizeof(WriteContext));
*ctx = writer->context;
@@ -490,8 +600,8 @@ serd_writer_end_anon(SerdWriter* writer,
}
assert(writer->indent > 0);
--writer->indent;
- serd_writer_write_delim(writer, '\n');
- sink("]", 1, writer);
+ write_sep(writer, SEP_END_P);
+ write_sep(writer, SEP_ANON_END);
reset_context(writer, true);
writer->context = *anon_stack_top(writer);
serd_stack_pop(&writer->anon_stack, sizeof(WriteContext));
@@ -536,9 +646,12 @@ serd_writer_new(SerdSyntax syntax,
writer->sink = sink;
writer->stream = stream;
writer->context = context;
+ writer->list_subj = SERD_NODE_NULL;
+ writer->list_depth = 0;
writer->bprefix = NULL;
writer->bprefix_len = 0;
writer->indent = 0;
+ writer->last_sep = SEP_NONE;
writer->empty = true;
if (style & SERD_STYLE_BULK) {
writer->bulk_sink = serd_bulk_sink_new(sink, stream, SERD_PAGE_SIZE);
diff --git a/tests/test-07.out b/tests/test-07.out
index 4a4e8ee2..e17cc7be 100644
--- a/tests/test-07.out
+++ b/tests/test-07.out
@@ -1,5 +1,5 @@
+<http://example.org/stuff/1.0/a> <http://example.org/stuff/1.0/b> _:genid1 .
_:genid1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> "apple" .
_:genid1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> _:genid2 .
_:genid2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> "banana" .
_:genid2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> <http://www.w3.org/1999/02/22-rdf-syntax-ns#nil> .
-<http://example.org/stuff/1.0/a> <http://example.org/stuff/1.0/b> _:genid1 .
diff --git a/tests/test-blank-in-list.out b/tests/test-blank-in-list.out
new file mode 100644
index 00000000..2e0c0eb0
--- /dev/null
+++ b/tests/test-blank-in-list.out
@@ -0,0 +1,4 @@
+<http://example.org/stuff/1.0/a> <http://example.org/stuff/1.0/b> _:genid1 .
+_:genid1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> _:genid2 .
+_:genid2 <http://example.org/stuff/1.0/c> <http://example.org/stuff/1.0/d> .
+_:genid1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> <http://www.w3.org/1999/02/22-rdf-syntax-ns#nil> .
diff --git a/tests/test-blank-in-list.ttl b/tests/test-blank-in-list.ttl
new file mode 100644
index 00000000..5c0b0766
--- /dev/null
+++ b/tests/test-blank-in-list.ttl
@@ -0,0 +1,2 @@
+@prefix : <http://example.org/stuff/1.0/> .
+:a :b ( [ :c :d ] ) .
diff --git a/tests/test-list-in-blank.out b/tests/test-list-in-blank.out
new file mode 100644
index 00000000..76023a8b
--- /dev/null
+++ b/tests/test-list-in-blank.out
@@ -0,0 +1,6 @@
+<http://example.org/stuff/1.0/a> <http://example.org/stuff/1.0/b> _:genid1 .
+_:genid1 <http://example.org/stuff/1.0/c> _:genid2 .
+_:genid2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> "apple" .
+_:genid2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> _:genid3 .
+_:genid3 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> "banana" .
+_:genid3 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> <http://www.w3.org/1999/02/22-rdf-syntax-ns#nil> .
diff --git a/tests/test-list-in-blank.ttl b/tests/test-list-in-blank.ttl
new file mode 100644
index 00000000..bdf75fce
--- /dev/null
+++ b/tests/test-list-in-blank.ttl
@@ -0,0 +1,2 @@
+@prefix : <http://example.org/stuff/1.0/> .
+:a :b [ :c ( "apple" "banana" ) ] .
diff --git a/tests/test-list-subject.out b/tests/test-list-subject.out
new file mode 100644
index 00000000..e0e7f497
--- /dev/null
+++ b/tests/test-list-subject.out
@@ -0,0 +1,5 @@
+_:genid1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> "apple" .
+_:genid1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> _:genid2 .
+_:genid2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> "banana" .
+_:genid2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> <http://www.w3.org/1999/02/22-rdf-syntax-ns#nil> .
+_:genid1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://example.org/List> .
diff --git a/tests/test-list-subject.ttl b/tests/test-list-subject.ttl
new file mode 100644
index 00000000..624336ae
--- /dev/null
+++ b/tests/test-list-subject.ttl
@@ -0,0 +1 @@
+("apple" "banana") a <http://example.org/List> . \ No newline at end of file
diff --git a/tests/test-pretty.out b/tests/test-pretty.out
new file mode 100644
index 00000000..c61f7c22
--- /dev/null
+++ b/tests/test-pretty.out
@@ -0,0 +1,46 @@
+<http://www.w3.org/1999/02/22-rdf-syntax-ns#nil> <http://example.org/isA> <http://example.org/List> .
+_:genid1 <http://example.org/isA> <http://example.org/Blank> .
+<http://www.w3.org/1999/02/22-rdf-syntax-ns#nil> <http://example.org/sameAs> <http://www.w3.org/1999/02/22-rdf-syntax-ns#nil> .
+_:genid2 <http://example.org/sameAs> _:genid3 .
+_:genid4 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> "apple" .
+_:genid4 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> _:genid5 .
+_:genid5 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> "banana" .
+_:genid5 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> _:genid6 .
+_:genid6 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> "pear" .
+_:genid6 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> <http://www.w3.org/1999/02/22-rdf-syntax-ns#nil> .
+_:genid4 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://example.org/List> .
+_:genid7 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> _:genid8 .
+_:genid8 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> <http://example.org/a> .
+_:genid8 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> _:genid9 .
+_:genid9 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> <http://example.org/b> .
+_:genid9 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> <http://www.w3.org/1999/02/22-rdf-syntax-ns#nil> .
+_:genid7 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> _:genid10 .
+_:genid10 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> _:genid11 .
+_:genid11 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> <http://example.org/c> .
+_:genid11 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> _:genid12 .
+_:genid12 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> <http://example.org/d> .
+_:genid12 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> <http://www.w3.org/1999/02/22-rdf-syntax-ns#nil> .
+_:genid10 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> <http://www.w3.org/1999/02/22-rdf-syntax-ns#nil> .
+_:genid7 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://example.org/List> .
+_:genid13 <http://example.org/list> _:genid14 .
+_:genid14 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> "apple" .
+_:genid14 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> _:genid15 .
+_:genid15 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> "banana" .
+_:genid15 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> _:genid16 .
+_:genid16 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> "pear" .
+_:genid16 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> <http://www.w3.org/1999/02/22-rdf-syntax-ns#nil> .
+_:genid17 <http://example.org/a> <http://example.org/b> .
+_:genid17 <http://example.org/a> <http://example.org/c> .
+_:genid17 <http://example.org/a> <http://example.org/d> .
+_:genid18 <http://example.org/a> _:genid19 .
+_:genid19 <http://example.org/b> <http://example.org/c> .
+_:genid19 <http://example.org/d> <http://example.org/e> .
+_:genid18 <http://example.org/a> _:genid20 .
+_:genid20 <http://example.org/f> <http://example.org/g> .
+_:genid21 <http://example.org/list> _:genid22 .
+_:genid22 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> _:genid23 .
+_:genid23 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://example.org/Apple> .
+_:genid22 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> _:genid24 .
+_:genid24 <http://www.w3.org/1999/02/22-rdf-syntax-ns#first> _:genid25 .
+_:genid25 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://example.org/Banana> .
+_:genid24 <http://www.w3.org/1999/02/22-rdf-syntax-ns#rest> <http://www.w3.org/1999/02/22-rdf-syntax-ns#nil> .
diff --git a/tests/test-pretty.ttl b/tests/test-pretty.ttl
new file mode 100644
index 00000000..4eb7204f
--- /dev/null
+++ b/tests/test-pretty.ttl
@@ -0,0 +1,44 @@
+@prefix : <http://example.org/> .
+
+() :isA :List .
+
+[] :isA :Blank .
+
+() :sameAs () .
+
+[] :sameAs [] .
+
+(
+ "apple"
+ "banana"
+ "pear"
+) a :List .
+
+(
+ (:a :b)
+ (:c :d)
+) a :List .
+
+[]
+ :list (
+ "apple"
+ "banana"
+ "pear"
+ ) .
+
+[]
+ :a :b , :c , :d .
+
+[]
+ :a [
+ :b :c ;
+ :d :e ;
+ ] , [
+ :f :g
+ ] .
+
+[]
+ :list (
+ [ a :Apple ]
+ [ a :Banana ]
+ ) . \ No newline at end of file
generated by cgit v1.2.1 (git 2.18.0) at 2024-06-26 00:53:01 +0000