Factor out syntax-specific reader implementation

1 files changed, 86 insertions, 0 deletions

diff --git a/src/reader.h b/src/reader.h
new file mode 100644
index 00000000..723a1c5a
--- /dev/null
+++ b/src/reader.h
@@ -0,0 +1,86 @@
+/*
+  Copyright 2011-2017 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#include "serd_internal.h"
+
+static inline uint8_t
+peek_byte(SerdReader* reader)
+{
+	return serd_byte_source_peek(&reader->source);
+}
+
+static inline uint8_t
+eat_byte(SerdReader* reader)
+{
+	const uint8_t    c  = peek_byte(reader);
+	const SerdStatus st = serd_byte_source_advance(&reader->source);
+	if (st) {
+		reader->status = st;
+	}
+	return c;
+}
+
+static inline uint8_t
+eat_byte_safe(SerdReader* reader, const uint8_t byte)
+{
+	const uint8_t c = eat_byte(reader);
+	assert(c == byte);
+	return c;
+}
+
+static inline uint8_t
+eat_byte_check(SerdReader* reader, const uint8_t byte)
+{
+	const uint8_t c = peek_byte(reader);
+	if (c != byte) {
+		return r_err(reader, SERD_ERR_BAD_SYNTAX,
+		             "expected `%c', not `%c'\n", byte, c);
+	}
+	return eat_byte_safe(reader, byte);
+}
+
+static inline bool
+eat_string(SerdReader* reader, const char* str, unsigned n)
+{
+	bool bad = false;
+	for (unsigned i = 0; i < n; ++i) {
+		bad |= (bool)eat_byte_check(reader, ((const uint8_t*)str)[i]);
+	}
+	return bad;
+}
+
+static inline SerdStatus
+push_byte(SerdReader* reader, Ref ref, const uint8_t c)
+{
+	SERD_STACK_ASSERT_TOP(reader, ref);
+	uint8_t* const  s    = serd_stack_push(&reader->stack, 1);
+	SerdNode* const node = (SerdNode*)(reader->stack.buf + ref);
+	++node->n_bytes;
+	if (!(c & 0x80)) {  // Starts with 0 bit, start of new character
+		++node->n_chars;
+	}
+	*(s - 1) = c;
+	*s       = '\0';
+	return SERD_SUCCESS;
+}
+
+static inline void
+push_bytes(SerdReader* reader, Ref ref, const uint8_t* bytes, unsigned len)
+{
+	for (unsigned i = 0; i < len; ++i) {
+		push_byte(reader, ref, bytes[i]);
+	}
+}