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-rw-r--r--doc/serdi.16
-rw-r--r--include/serd/serd.h17
-rw-r--r--src/serdi.c13
-rw-r--r--src/syntax.c8
-rw-r--r--src/writer.c8
-rw-r--r--test/meson.build8
-rwxr-xr-xtest/test_empty.py27
7 files changed, 70 insertions, 17 deletions
diff --git a/doc/serdi.1 b/doc/serdi.1
index 22ca352f..7cb2c923 100644
--- a/doc/serdi.1
+++ b/doc/serdi.1
@@ -67,6 +67,7 @@ Case is ignored, valid values are:
.Dq NQuads ,
.Dq NTriples ,
.Dq TriG ,
+and
.Dq Turtle .
.Pp
.It Fl k Ar bytes
@@ -86,10 +87,15 @@ Note that data may be lost when using this option.
Write output as
.Ar syntax .
Case is ignored, valid values are:
+.Dq empty ,
.Dq NQuads ,
.Dq NTriples ,
.Dq TriG ,
+and
.Dq Turtle .
+When
+.Dq empty
+is given, output is suppressed, so only errors will be printed.
.Pp
.It Fl p Ar prefix
Add
diff --git a/include/serd/serd.h b/include/serd/serd.h
index ba1b4ddc..79353e50 100644
--- a/include/serd/serd.h
+++ b/include/serd/serd.h
@@ -127,10 +127,11 @@ typedef enum {
/// RDF syntax type
typedef enum {
- SERD_TURTLE = 1, ///< Terse triples http://www.w3.org/TR/turtle
- SERD_NTRIPLES = 2, ///< Line-based triples http://www.w3.org/TR/n-triples/
- SERD_NQUADS = 3, ///< Line-based quads http://www.w3.org/TR/n-quads/
- SERD_TRIG = 4 ///< Terse quads http://www.w3.org/TR/trig/
+ SERD_SYNTAX_EMPTY = 0, ///< Empty syntax (suppress input or output)
+ SERD_TURTLE = 1, ///< Terse triples http://www.w3.org/TR/turtle
+ SERD_NTRIPLES = 2, ///< Flat triples http://www.w3.org/TR/n-triples/
+ SERD_NQUADS = 3, ///< Flat quads http://www.w3.org/TR/n-quads/
+ SERD_TRIG = 4 ///< Terse quads http://www.w3.org/TR/trig/
} SerdSyntax;
/// Flags indicating inline abbreviation information for a statement
@@ -461,8 +462,8 @@ serd_byte_sink_free(SerdByteSink* SERD_NULLABLE sink);
/**
Get a syntax by name.
- Case-insensitive, supports "Turtle", "NTriples", "NQuads", and "TriG". Zero
- is returned if the name is not recognized.
+ Case-insensitive, supports "Turtle", "NTriples", "NQuads", and "TriG".
+ `SERD_SYNTAX_EMPTY` is returned if the name is not recognized.
*/
SERD_PURE_API
SerdSyntax
@@ -471,8 +472,8 @@ serd_syntax_by_name(const char* SERD_NONNULL name);
/**
Guess a syntax from a filename.
- This uses the file extension to guess the syntax of a file. Zero is
- returned if the extension is not recognized.
+ This uses the file extension to guess the syntax of a file.
+ `SERD_SYNTAX_EMPTY` is returned if the extension is not recognized.
*/
SERD_PURE_API
SerdSyntax
diff --git a/src/serdi.c b/src/serdi.c
index 72b7afe1..e546f463 100644
--- a/src/serdi.c
+++ b/src/serdi.c
@@ -31,6 +31,7 @@
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#define SERDI_ERROR(msg) fprintf(stderr, "serdi: " msg)
#define SERDI_ERRORF(fmt, ...) fprintf(stderr, "serdi: " fmt, __VA_ARGS__)
@@ -95,14 +96,15 @@ main(int argc, char** argv)
return print_usage(argv[0], true);
}
- SerdSyntax input_syntax = (SerdSyntax)0;
- SerdSyntax output_syntax = (SerdSyntax)0;
+ SerdSyntax input_syntax = SERD_SYNTAX_EMPTY;
+ SerdSyntax output_syntax = SERD_SYNTAX_EMPTY;
SerdReaderFlags reader_flags = 0;
SerdWriterFlags writer_flags = 0;
bool from_string = false;
bool from_stdin = false;
bool bulk_read = true;
bool bulk_write = false;
+ bool osyntax_set = false;
bool quiet = false;
size_t stack_size = 4194304;
const char* add_prefix = NULL;
@@ -158,11 +160,14 @@ main(int argc, char** argv)
}
stack_size = (size_t)size;
} else if (argv[a][1] == 'o') {
+ osyntax_set = true;
if (++a == argc) {
return missing_arg(argv[0], 'o');
}
- if (!(output_syntax = serd_syntax_by_name(argv[a]))) {
+ if (!strcmp(argv[a], "empty")) {
+ output_syntax = SERD_SYNTAX_EMPTY;
+ } else if (!(output_syntax = serd_syntax_by_name(argv[a]))) {
return print_usage(argv[0], true);
}
} else if (argv[a][1] == 'p') {
@@ -206,7 +211,7 @@ main(int argc, char** argv)
}
const bool input_has_graphs = serd_syntax_has_graphs(input_syntax);
- if (!output_syntax) {
+ if (!output_syntax && !osyntax_set) {
output_syntax = input_has_graphs ? SERD_NQUADS : SERD_NTRIPLES;
}
diff --git a/src/syntax.c b/src/syntax.c
index 61814709..59453bca 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -32,7 +32,7 @@ static const Syntax syntaxes[] = {
{"ntriples", ".nt", SERD_NTRIPLES},
{"nquads", ".nq", SERD_NQUADS},
{"trig", ".trig", SERD_TRIG},
- {NULL, NULL, (SerdSyntax)0},
+ {NULL, NULL, SERD_SYNTAX_EMPTY},
};
SerdSyntax
@@ -43,7 +43,7 @@ serd_syntax_by_name(const char* const name)
return s->syntax;
}
}
- return (SerdSyntax)0;
+ return SERD_SYNTAX_EMPTY;
}
SerdSyntax
@@ -52,12 +52,12 @@ serd_guess_syntax(const char* const filename)
const char* ext = strrchr(filename, '.');
if (ext) {
for (const Syntax* s = syntaxes; s->name; ++s) {
- if (!serd_strncasecmp(s->extension, ext, strlen(ext))) {
+ if (s->extension && !serd_strncasecmp(s->extension, ext, strlen(ext))) {
return s->syntax;
}
}
}
- return (SerdSyntax)0;
+ return SERD_SYNTAX_EMPTY;
}
bool
diff --git a/src/writer.c b/src/writer.c
index 71766d9d..afeee33d 100644
--- a/src/writer.c
+++ b/src/writer.c
@@ -843,6 +843,8 @@ write_curie(SerdWriter* const writer,
if (is_inline_start(writer, field, flags)) {
TRY(st, esink(" ;", 2, writer));
}
+ case SERD_SYNTAX_EMPTY:
+ break;
}
return st;
}
@@ -946,6 +948,10 @@ serd_writer_write_statement(SerdWriter* writer,
assert(!((flags & SERD_ANON_S) && (flags & SERD_LIST_S)));
assert(!((flags & SERD_ANON_O) && (flags & SERD_LIST_O)));
+ if (writer->syntax == SERD_SYNTAX_EMPTY) {
+ return SERD_SUCCESS;
+ }
+
SerdStatus st = SERD_SUCCESS;
const SerdNode* const subject = serd_statement_subject(statement);
const SerdNode* const predicate = serd_statement_predicate(statement);
@@ -1093,7 +1099,7 @@ serd_writer_write_statement(SerdWriter* writer,
SERD_WARN_UNUSED_RESULT static SerdStatus
serd_writer_end_anon(SerdWriter* writer, const SerdNode* node)
{
- if (writer->syntax == SERD_NTRIPLES || writer->syntax == SERD_NQUADS) {
+ if (writer->syntax != SERD_TURTLE && writer->syntax != SERD_TRIG) {
return SERD_SUCCESS;
}
diff --git a/test/meson.build b/test/meson.build
index 3926888d..49a3fe0c 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -107,6 +107,14 @@ if get_option('utils')
should_fail: true,
suite: ['serdi', 'input'])
+ # Output
+
+ test('empty', files('test_empty.py'),
+ args: script_args + [serd_ttl],
+ suite: 'output')
+
+ # FIXME: Old base URI argument?
+
# IO errors
test('read_dir', serdi,
diff --git a/test/test_empty.py b/test/test_empty.py
new file mode 100755
index 00000000..a7978e6c
--- /dev/null
+++ b/test/test_empty.py
@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+
+"""Test writing empty output."""
+
+import argparse
+import sys
+import shlex
+import subprocess
+import tempfile
+
+parser = argparse.ArgumentParser(description=__doc__)
+
+parser.add_argument("--serdi", default="./serdi", help="path to serdi")
+parser.add_argument("--wrapper", default="", help="executable wrapper")
+parser.add_argument("input", help="valid input file")
+
+args = parser.parse_args(sys.argv[1:])
+command = shlex.split(args.wrapper) + [args.serdi, "-o", "empty", args.input]
+
+with tempfile.TemporaryFile() as out:
+
+ proc = subprocess.run(command, check=False, stdout=out)
+
+ out.seek(0, 2) # Seek to end
+
+ assert proc.returncode == 0
+ assert out.tell() == 0
generated by cgit v1.2.1 (git 2.18.0) at 2024-07-05 23:22:43 +0000