Simplify reader interface

3 files changed, 71 insertions, 90 deletions

diff --git a/src/n3.c b/src/n3.c
index 22398604..38acdb46 100644
--- a/src/n3.c
+++ b/src/n3.c
@@ -1583,8 +1583,9 @@ read_nquadsDoc(SerdReader* reader)
 		if (peek_byte(reader) == EOF) {
 			break;
 		} else if (peek_byte(reader) == '@') {
-			return r_err(reader, SERD_ERR_BAD_SYNTAX,
-			             "syntax does not support directives\n");
+			r_err(reader, SERD_ERR_BAD_SYNTAX,
+			      "syntax does not support directives\n");
+			return SERD_ERR_BAD_SYNTAX;
 		}
 
 		// subject predicate object
diff --git a/src/reader.c b/src/reader.c
index eef4d95b..3784f297 100644
--- a/src/reader.c
+++ b/src/reader.c
@@ -21,11 +21,12 @@
 
 #include <errno.h>
 #include <stdarg.h>
-#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
+static SerdStatus serd_reader_prepare(SerdReader* reader);
+
 SerdStatus
 r_err(SerdReader* reader, SerdStatus st, const char* fmt, ...)
 {
@@ -63,22 +64,6 @@ blank_id(SerdReader* reader)
 	return ref;
 }
 
-/** fread-like wrapper for getc (which is faster). */
-static size_t
-serd_file_read_byte(void* buf, size_t size, size_t nmemb, void* stream)
-{
-	(void)size;
-	(void)nmemb;
-
-	const int c = getc((FILE*)stream);
-	if (c == EOF) {
-		*((uint8_t*)buf) = 0;
-		return 0;
-	}
-	*((uint8_t*)buf) = (uint8_t)c;
-	return 1;
-}
-
 Ref
 push_node_padded(SerdReader* reader, size_t maxlen,
                  SerdType type, const char* str, size_t n_bytes)
@@ -160,9 +145,16 @@ read_statement(SerdReader* reader)
 	return read_n3_statement(reader);
 }
 
-static SerdStatus
-read_doc(SerdReader* reader)
+SerdStatus
+serd_reader_read_document(SerdReader* reader)
 {
+	if (!reader->source.prepared) {
+		SerdStatus st = serd_reader_prepare(reader);
+		if (st) {
+			return st;
+		}
+	}
+
 	return ((reader->syntax == SERD_NQUADS) ? read_nquadsDoc(reader)
 	                                        : read_turtleTrigDoc(reader));
 }
@@ -277,10 +269,20 @@ serd_reader_read_file(SerdReader* reader,
 		return SERD_ERR_UNKNOWN;
 	}
 
-	SerdStatus ret = serd_reader_read_file_handle(reader, fd, path);
+	SerdStatus st = serd_reader_start_stream(
+		reader, (SerdSource)fread, (SerdStreamErrorFunc)ferror,
+		fd, path, SERD_PAGE_SIZE);
+
+	if (!st) {
+		st = serd_reader_read_document(reader);
+	}
+
+	const SerdStatus est = serd_reader_end_stream(reader);
+
 	fclose(fd);
 	free(path);
-	return ret;
+
+	return st ? st : est;
 }
 
 static SerdStatus
@@ -301,30 +303,21 @@ skip_bom(SerdReader* me)
 }
 
 SerdStatus
-serd_reader_start_stream(SerdReader* reader,
-                         FILE*       file,
-                         const char* name,
-                         bool        bulk)
+serd_reader_start_stream(SerdReader*         reader,
+                         SerdSource          read_func,
+                         SerdStreamErrorFunc error_func,
+                         void*               stream,
+                         const char*         name,
+                         size_t              page_size)
 {
-	return serd_reader_start_source_stream(
-		reader,
-		bulk ? (SerdSource)fread : serd_file_read_byte,
-		(SerdStreamErrorFunc)ferror,
-		file,
-		name,
-		bulk ? SERD_PAGE_SIZE : 1);
+	return serd_byte_source_open_source(
+		&reader->source, read_func, error_func, stream, name, page_size);
 }
 
 SerdStatus
-serd_reader_start_source_stream(SerdReader*         reader,
-                                SerdSource          read_func,
-                                SerdStreamErrorFunc error_func,
-                                void*               stream,
-                                const char*         name,
-                                size_t              page_size)
+serd_reader_start_string(SerdReader* reader, const char* utf8)
 {
-	return serd_byte_source_open_source(
-		&reader->source, read_func, error_func, stream, name, page_size);
+	return serd_byte_source_open_string(&reader->source, utf8);
 }
 
 static SerdStatus
@@ -366,48 +359,12 @@ serd_reader_end_stream(SerdReader* reader)
 }
 
 SerdStatus
-serd_reader_read_file_handle(SerdReader* reader,
-                             FILE*       file,
-                             const char* name)
-{
-	return serd_reader_read_source(
-		reader, (SerdSource)fread, (SerdStreamErrorFunc)ferror,
-		file, name, SERD_PAGE_SIZE);
-}
-
-SerdStatus
-serd_reader_read_source(SerdReader*         reader,
-                        SerdSource          source,
-                        SerdStreamErrorFunc error,
-                        void*               stream,
-                        const char*         name,
-                        size_t              page_size)
-{
-	SerdStatus st = serd_reader_start_source_stream(
-		reader, source, error, stream, name, page_size);
-
-	if (st || (st = serd_reader_prepare(reader))) {
-		serd_reader_end_stream(reader);
-		return st;
-	} else if ((st = read_doc(reader))) {
-		serd_reader_end_stream(reader);
-		return st;
-	}
-
-	return serd_reader_end_stream(reader);
-}
-
-SerdStatus
 serd_reader_read_string(SerdReader* reader, const char* utf8)
 {
-	serd_byte_source_open_string(&reader->source, utf8);
+	serd_reader_start_string(reader, utf8);
 
-	SerdStatus st = serd_reader_prepare(reader);
-	if (!st) {
-		st = read_doc(reader);
-	}
+	const SerdStatus st  = serd_reader_read_document(reader);
+	const SerdStatus est = serd_byte_source_close(&reader->source);
 
-	serd_byte_source_close(&reader->source);
-
-	return st;
+	return st ? st : est;
 }
diff --git a/src/serdi.c b/src/serdi.c
index 47118e8f..99be638c 100644
--- a/src/serdi.c
+++ b/src/serdi.c
@@ -32,6 +32,7 @@
 
 #include <errno.h>
 #include <stdbool.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -146,6 +147,22 @@ serd_fopen(const char* path, const char* mode)
 	return fd;
 }
 
+/** fread-like wrapper for getc (which is faster). */
+static size_t
+serd_file_read_byte(void* buf, size_t size, size_t nmemb, void* stream)
+{
+	(void)size;
+	(void)nmemb;
+
+	const int c = getc((FILE*)stream);
+	if (c == EOF) {
+		*((uint8_t*)buf) = 0;
+		return 0;
+	}
+	*((uint8_t*)buf) = (uint8_t)c;
+	return 1;
+}
+
 int
 main(int argc, char** argv)
 {
@@ -320,17 +337,23 @@ main(int argc, char** argv)
 
 	SerdStatus st = SERD_SUCCESS;
 	if (!from_file) {
-		st = serd_reader_read_string(reader, input);
-	} else if (bulk_read) {
-		st = serd_reader_read_file_handle(reader, in_fd, in_name);
+		st = serd_reader_start_string(reader, input);
 	} else {
-		st = serd_reader_start_stream(reader, in_fd, in_name, false);
-		while (!st) {
-			st = serd_reader_read_chunk(reader);
-		}
-		serd_reader_end_stream(reader);
+		st = serd_reader_start_stream(
+			reader,
+			bulk_read ? (SerdSource)fread : serd_file_read_byte,
+			(SerdStreamErrorFunc)ferror,
+			in_fd,
+			in_name,
+			bulk_read ? 4096 : 1);
+	}
+
+	if (!st) {
+		st = serd_reader_read_document(reader);
 	}
 
+	serd_reader_end_stream(reader);
+
 	serd_reader_free(reader);
 	serd_writer_finish(writer);
 	serd_writer_free(writer);