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-rw-r--r--src/writer.c220
1 files changed, 151 insertions, 69 deletions
diff --git a/src/writer.c b/src/writer.c
index 1e50b7b0..3e91bcd2 100644
--- a/src/writer.c
+++ b/src/writer.c
@@ -20,6 +20,15 @@
#include <stdlib.h>
#include "serd/serd.h"
+#include "serd_stack.h"
+
+typedef struct {
+ const SerdString* graph;
+ const SerdString* subject;
+ const SerdString* predicate;
+} WriteContext;
+
+static const WriteContext WRITE_CONTEXT_NULL = { 0, 0, 0 };
typedef bool (*StatementWriter)(SerdWriter writer,
const SerdString* graph,
@@ -43,13 +52,12 @@ struct SerdWriterImpl {
SerdStyle style;
SerdEnv env;
SerdURI base_uri;
+ SerdStack anon_stack;
SerdSink sink;
void* stream;
StatementWriter write_statement;
NodeWriter write_node;
- const SerdString* prev_g;
- const SerdString* prev_s;
- const SerdString* prev_p;
+ WriteContext context;
unsigned indent;
};
@@ -57,10 +65,18 @@ typedef enum {
WRITE_NORMAL,
WRITE_URI,
WRITE_STRING
-} WriteContext;
+} TextContext;
+
+static inline WriteContext*
+anon_stack_top(SerdWriter writer)
+{
+ assert(!serd_stack_is_empty(&writer->anon_stack));
+ return (WriteContext*)(writer->anon_stack.buf
+ + writer->anon_stack.size - sizeof(WriteContext));
+}
static bool
-write_text(SerdWriter writer, WriteContext ctx,
+write_text(SerdWriter writer, TextContext ctx,
const uint8_t* utf8, size_t n_bytes, uint8_t terminator)
{
char escape[10] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
@@ -147,6 +163,24 @@ write_text(SerdWriter writer, WriteContext ctx,
return true;
}
+static void
+serd_writer_write_delim(SerdWriter writer, const uint8_t delim)
+{
+ switch (delim) {
+ case 0:
+ case '\n':
+ break;
+ default:
+ writer->sink(" ", 1, writer->stream);
+ case '[':
+ writer->sink(&delim, 1, writer->stream);
+ }
+ writer->sink("\n", 1, writer->stream);
+ for (unsigned i = 0; i < writer->indent; ++i) {
+ writer->sink("\t", 1, writer->stream);
+ }
+}
+
static bool
write_node(SerdWriter writer,
SerdNodeType type,
@@ -157,11 +191,26 @@ write_node(SerdWriter writer,
SerdChunk uri_prefix;
SerdChunk uri_suffix;
switch (type) {
- case BLANK:
+ case SERD_ANON_BEGIN:
+ if (writer->syntax != SERD_NTRIPLES) {
+ ++writer->indent;
+ serd_writer_write_delim(writer, '[');
+ WriteContext* ctx = (WriteContext*)serd_stack_push(
+ &writer->anon_stack, sizeof(WriteContext));
+ *ctx = writer->context;
+ writer->context.subject = str;
+ writer->context.predicate = 0;
+ break;
+ }
+ case SERD_ANON:
+ if (writer->syntax != SERD_NTRIPLES) {
+ break;
+ } // else fall through
+ case SERD_BLANK_ID:
writer->sink("_:", 2, writer->stream);
writer->sink(str->buf, str->n_bytes - 1, writer->stream);
break;
- case QNAME:
+ case SERD_CURIE:
switch (writer->syntax) {
case SERD_NTRIPLES:
if (!serd_env_expand(writer->env, str, &uri_prefix, &uri_suffix)) {
@@ -177,7 +226,19 @@ write_node(SerdWriter writer,
writer->sink(str->buf, str->n_bytes - 1, writer->stream);
}
break;
- case URI:
+ case SERD_LITERAL:
+ writer->sink("\"", 1, writer->stream);
+ write_text(writer, WRITE_STRING, str->buf, str->n_bytes - 1, '"');
+ writer->sink("\"", 1, writer->stream);
+ if (lang) {
+ writer->sink("@", 1, writer->stream);
+ writer->sink(lang->buf, lang->n_bytes - 1, writer->stream);
+ } else if (datatype) {
+ writer->sink("^^", 2, writer->stream);
+ write_node(writer, SERD_URI, datatype, NULL, NULL);
+ }
+ break;
+ case SERD_URI:
if (!serd_uri_string_has_scheme(str->buf)) {
SerdURI uri;
if (serd_uri_parse(str->buf, &uri)) {
@@ -196,39 +257,10 @@ write_node(SerdWriter writer,
return true;
}
return false;
- case LITERAL:
- writer->sink("\"", 1, writer->stream);
- write_text(writer, WRITE_STRING, str->buf, str->n_bytes - 1, '"');
- writer->sink("\"", 1, writer->stream);
- if (lang) {
- writer->sink("@", 1, writer->stream);
- writer->sink(lang->buf, lang->n_bytes - 1, writer->stream);
- } else if (datatype) {
- writer->sink("^^", 2, writer->stream);
- write_node(writer, URI, datatype, NULL, NULL);
- }
- break;
}
return true;
}
-static void
-serd_writer_write_delim(SerdWriter writer, const uint8_t delim)
-{
- switch (delim) {
- case 0:
- case '\n':
- break;
- default:
- writer->sink(" ", 1, writer->stream);
- writer->sink(&delim, 1, writer->stream);
- }
- writer->sink("\n", 1, writer->stream);
- for (unsigned i = 0; i < writer->indent; ++i) {
- writer->sink("\t", 1, writer->stream);
- }
-}
-
SERD_API
bool
serd_writer_write_statement(SerdWriter writer,
@@ -262,38 +294,63 @@ serd_writer_write_statement_abbrev(SerdWriter writer,
const SerdString* object_lang)
{
assert(subject && predicate && object);
- if (subject == writer->prev_s) {
- if (predicate == writer->prev_p) {
+ if (subject == writer->context.subject) {
+ if (predicate == writer->context.predicate) {
++writer->indent;
serd_writer_write_delim(writer, ',');
write_node(writer, object_type, object, object_datatype, object_lang);
--writer->indent;
} else {
- serd_writer_write_delim(writer, ';');
+ if (writer->context.predicate) {
+ serd_writer_write_delim(writer, ';');
+ } else {
+ ++writer->indent;
+ serd_writer_write_delim(writer, '\n');
+ }
write_node(writer, predicate_type, predicate, NULL, NULL);
+ writer->context.predicate = predicate;
writer->sink(" ", 1, writer->stream);
write_node(writer, object_type, object, object_datatype, object_lang);
}
} else {
- if (writer->prev_s) {
- --writer->indent;
- serd_writer_write_delim(writer, '.');
- serd_writer_write_delim(writer, '\n');
+ if (writer->context.subject) {
+ if (writer->indent > 0) {
+ --writer->indent;
+ }
+ if (serd_stack_is_empty(&writer->anon_stack)) {
+ serd_writer_write_delim(writer, '.');
+ serd_writer_write_delim(writer, '\n');
+ }
}
- write_node(writer, subject_type, subject, NULL, NULL);
- ++writer->indent;
- serd_writer_write_delim(writer, 0);
- writer->sink(" ", 1, writer->stream);
+ if (subject_type == SERD_ANON_BEGIN) {
+ writer->sink("[ ", 2, writer->stream);
+ ++writer->indent;
+ WriteContext* ctx = (WriteContext*)serd_stack_push(
+ &writer->anon_stack, sizeof(WriteContext));
+ *ctx = writer->context;
+ writer->context.subject = subject;
+ writer->context.predicate = 0;
+ } else {
+ write_node(writer, subject_type, subject, NULL, NULL);
+ ++writer->indent;
+ if (subject_type != SERD_ANON_BEGIN && subject_type != SERD_ANON) {
+ serd_writer_write_delim(writer, '\n');
+ }
+ }
+
+ writer->context.subject = subject;
+ writer->context.predicate = 0;
+
write_node(writer, predicate_type, predicate, NULL, NULL);
+ writer->context.predicate = predicate;
writer->sink(" ", 1, writer->stream);
write_node(writer, object_type, object, object_datatype, object_lang);
}
- writer->prev_g = graph;
- writer->prev_s = subject;
- writer->prev_p = predicate;
+ const WriteContext new_context = { graph, subject, predicate };
+ writer->context = new_context;
return true;
}
@@ -321,10 +378,36 @@ serd_writer_write_statement_flat(SerdWriter writer,
}
SERD_API
+bool
+serd_writer_end_anon(SerdWriter writer,
+ const SerdString* subject)
+{
+ if (writer->syntax == SERD_NTRIPLES) {
+ return true;
+ }
+ if (serd_stack_is_empty(&writer->anon_stack)) {
+ fprintf(stderr, "unexpected SERD_END received\n");
+ return false;
+ }
+ assert(writer->indent > 0);
+ --writer->indent;
+ serd_writer_write_delim(writer, '\n');
+ writer->sink("]", 1, writer->stream);
+ writer->context = *anon_stack_top(writer);
+ serd_stack_pop(&writer->anon_stack, sizeof(WriteContext));
+ if (serd_stack_is_empty(&writer->anon_stack)) {
+ // End of anonymous subject, reset context
+ writer->context.subject = subject;
+ writer->context.predicate = 0;
+ }
+ return true;
+}
+
+SERD_API
void
serd_writer_finish(SerdWriter writer)
{
- if (writer->prev_s) {
+ if (writer->context.subject) {
writer->sink(" .\n", 3, writer->stream);
}
}
@@ -338,17 +421,17 @@ serd_writer_new(SerdSyntax syntax,
SerdSink sink,
void* stream)
{
- SerdWriter writer = malloc(sizeof(struct SerdWriterImpl));
- writer->syntax = syntax;
- writer->style = style;
- writer->env = env;
- writer->base_uri = *base_uri;
- writer->sink = sink;
- writer->stream = stream;
- writer->prev_g = 0;
- writer->prev_s = 0;
- writer->prev_p = 0;
- writer->indent = 0;
+ const WriteContext context = WRITE_CONTEXT_NULL;
+ SerdWriter writer = malloc(sizeof(struct SerdWriterImpl));
+ writer->syntax = syntax;
+ writer->style = style;
+ writer->env = env;
+ writer->base_uri = *base_uri;
+ writer->anon_stack = serd_stack_new(sizeof(WriteContext));
+ writer->sink = sink;
+ writer->stream = stream;
+ writer->context = context;
+ writer->indent = 0;
writer->write_node = write_node;
if ((style & SERD_STYLE_ABBREVIATED)) {
writer->write_statement = serd_writer_write_statement_abbrev;
@@ -365,9 +448,9 @@ serd_writer_set_base_uri(SerdWriter writer,
{
writer->base_uri = *uri;
if (writer->syntax != SERD_NTRIPLES) {
- if (writer->prev_g || writer->prev_s) {
+ if (writer->context.graph || writer->context.subject) {
writer->sink(" .\n\n", 4, writer->stream);
- writer->prev_g = writer->prev_s = writer->prev_p = 0;
+ writer->context = WRITE_CONTEXT_NULL;
}
writer->sink("@base ", 6, writer->stream);
writer->sink(" <", 2, writer->stream);
@@ -383,11 +466,9 @@ serd_writer_set_prefix(SerdWriter writer,
const SerdString* uri)
{
if (writer->syntax != SERD_NTRIPLES) {
- if (writer->prev_g || writer->prev_s) {
+ if (writer->context.graph || writer->context.subject) {
writer->sink(" .\n\n", 4, writer->stream);
- writer->prev_g = 0;
- writer->prev_s = 0;
- writer->prev_p = 0;
+ writer->context = WRITE_CONTEXT_NULL;
}
writer->sink("@prefix ", 8, writer->stream);
writer->sink(name->buf, name->n_bytes - 1, writer->stream);
@@ -402,5 +483,6 @@ void
serd_writer_free(SerdWriter writer)
{
SerdWriter const me = (SerdWriter)writer;
+ serd_stack_free(&writer->anon_stack);
free(me);
}
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