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/*
*
* Copyright (c) 2000-2001, Darren Hiebert
*
* This source code is released for free distribution under the terms of the
* GNU General Public License version 2 or (at your option) any later version.
*
* This module contains functions for generating tags for diff files (based on Sh parser).
*/
/*
* INCLUDE FILES
*/
#include "general.h" /* must always come first */
#include <ctype.h>
#include <string.h>
#include "entry.h"
#include "parse.h"
#include "routines.h"
#include "read.h"
#include "vstring.h"
/*
* DATA DEFINITIONS
*/
typedef enum {
K_MODIFIED_FILE,
K_NEW_FILE,
K_DELETED_FILE,
K_HUNK,
} diffKind;
static kindDefinition DiffKinds [] = {
{ true, 'm', "modifiedFile", "modified files"},
{ true, 'n', "newFile", "newly created files"},
{ true, 'd', "deletedFile", "deleted files"},
{ true, 'h', "hunk", "hunks"},
};
enum {
DIFF_DELIM_MINUS = 0,
DIFF_DELIM_PLUS
};
static const char *DiffDelims[2] = {
"--- ",
"+++ "
};
static const char *HunkDelim[2] = {
"@@ ",
" @@",
};
/*
* FUNCTION DEFINITIONS
*/
static const unsigned char *stripAbsolute (const unsigned char *filename)
{
const unsigned char *tmp;
/* strip any absolute path */
if (*filename == '/' || *filename == '\\')
{
bool skipSlash = true;
tmp = (const unsigned char*) strrchr ((const char*) filename, '/');
if (tmp == NULL)
{ /* if no / is contained try \ in case of a Windows filename */
tmp = (const unsigned char*) strrchr ((const char*) filename, '\\');
if (tmp == NULL)
{ /* last fallback, probably the filename doesn't contain a path, so take it */
tmp = filename;
skipSlash = false;
}
}
/* skip the leading slash or backslash */
if (skipSlash)
tmp++;
}
else
tmp = filename;
return tmp;
}
static int parseHunk (const unsigned char* cp, vString *hunk, int scope_index)
{
/*
example input: @@ -0,0 +1,134 @@
expected output: -0,0 +1,134
*/
const char *next_delim;
const char *start, *end;
const char *c;
int i = CORK_NIL;
cp += 3;
start = (const char*)cp;
if (*start != '-')
return i;
next_delim = strstr ((const char*)cp, HunkDelim[1]);
if ((next_delim == NULL)
|| (! (start < next_delim )))
return i;
end = next_delim;
if (! ( '0' <= *( end - 1 ) && *( end - 1 ) <= '9'))
return i;
for (c = start; c < end; c++)
if (*c == '\t')
return i;
vStringNCopyS (hunk, start, end - start);
i = makeSimpleTag (hunk, K_HUNK);
tagEntryInfo *e = getEntryInCorkQueue (i);
if (e && scope_index > CORK_NIL)
e->extensionFields.scopeIndex = scope_index;
return i;
}
static void markTheLastTagAsDeletedFile (int scope_index)
{
tagEntryInfo *e = getEntryInCorkQueue (scope_index);
if (e)
e->kindIndex = K_DELETED_FILE;
}
static void findDiffTags (void)
{
vString *filename = vStringNew ();
vString *hunk = vStringNew ();
const unsigned char *line, *tmp;
int delim = DIFF_DELIM_MINUS;
diffKind kind;
int scope_index = CORK_NIL;
while ((line = readLineFromInputFile ()) != NULL)
{
const unsigned char* cp = line;
if (strncmp ((const char*) cp, DiffDelims[delim], 4u) == 0)
{
scope_index = CORK_NIL;
cp += 4;
if (isspace ((int) *cp)) continue;
/* when original filename is /dev/null use the new one instead */
if (delim == DIFF_DELIM_MINUS &&
strncmp ((const char*) cp, "/dev/null", 9u) == 0 &&
(cp[9] == 0 || isspace (cp[9])))
{
delim = DIFF_DELIM_PLUS;
continue;
}
tmp = stripAbsolute (cp);
if (tmp != NULL)
{
while (! isspace(*tmp) && *tmp != '\0')
{
vStringPut(filename, *tmp);
tmp++;
}
if (delim == DIFF_DELIM_PLUS)
kind = K_NEW_FILE;
else
kind = K_MODIFIED_FILE;
scope_index = makeSimpleTag (filename, kind);
vStringClear (filename);
}
/* restore default delim */
delim = DIFF_DELIM_MINUS;
}
else if ((scope_index > CORK_NIL)
&& (strncmp ((const char*) cp, DiffDelims[1], 4u) == 0))
{
cp += 4;
if (isspace ((int) *cp)) continue;
/* when modified filename is /dev/null, the original name is deleted. */
if (strncmp ((const char*) cp, "/dev/null", 9u) == 0 &&
(cp[9] == 0 || isspace (cp[9])))
markTheLastTagAsDeletedFile (scope_index);
}
else if (strncmp ((const char*) cp, HunkDelim[0], 3u) == 0)
{
if (parseHunk (cp, hunk, scope_index) != CORK_NIL)
vStringClear (hunk);
}
}
vStringDelete (hunk);
vStringDelete (filename);
}
extern parserDefinition* DiffParser (void)
{
static const char *const extensions [] = { "diff", "patch", NULL };
parserDefinition* const def = parserNew ("Diff");
def->kindTable = DiffKinds;
def->kindCount = ARRAY_SIZE (DiffKinds);
def->extensions = extensions;
def->parser = findDiffTags;
def->useCork = CORK_QUEUE;
return def;
}
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