parse: extract parse module

The `git_patch_parse_ctx` encapsulates both parser state as well as
options specific to patch parsing. To advance this state and keep it
consistent, we provide a few functions which handle advancing the
current position and accessing bytes of the patch contents. In fact,
these functions are quite generic and not related to patch-parsing by
themselves. Seeing that we have similar logic inside of other modules,
it becomes quite enticing to extract this functionality into its own
parser module.

To do so, we create a new module `parse` with a central struct called
`git_parse_ctx`. It encapsulates both the content that is to be parsed
as well as its lengths and the current position. `git_patch_parse_ctx`
now only contains this `parse_ctx` only, which is then accessed whenever
we need to touch the current parser. This is the first step towards
re-using this functionality across other modules which require parsing
functionality and remove code-duplication.

1 files changed, 2 insertions, 11 deletions

diff --git a/src/patch_parse.h b/src/patch_parse.h
index f27651e39..140629da8 100644
--- a/src/patch_parse.h
+++ b/src/patch_parse.h
@@ -9,24 +9,15 @@
 
 #include "common.h"
 
+#include "parse.h"
 #include "patch.h"
 
 typedef struct {
 	git_refcount rc;
 
-	/* Original content buffer */
-	const char *content;
-	size_t content_len;
-
 	git_patch_options opts;
 
-	/* The remaining (unparsed) buffer */
-	const char *remain;
-	size_t remain_len;
-
-	const char *line;
-	size_t line_len;
-	size_t line_num;
+	git_parse_ctx parse_ctx;
 } git_patch_parse_ctx;
 
 extern git_patch_parse_ctx *git_patch_parse_ctx_init(