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src/subversion/subversion/libsvn_diff/parse-diff.c  view on Meta::CPAN

/*
 * parse-diff.c: functions for parsing diff files
 *
 * ====================================================================
 *    Licensed to the Apache Software Foundation (ASF) under one
 *    or more contributor license agreements.  See the NOTICE file
 *    distributed with this work for additional information
 *    regarding copyright ownership.  The ASF licenses this file
 *    to you under the Apache License, Version 2.0 (the
 *    "License"); you may not use this file except in compliance
 *    with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing,
 *    software distributed under the License is distributed on an
 *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *    KIND, either express or implied.  See the License for the
 *    specific language governing permissions and limitations
 *    under the License.
 * ====================================================================
 */

#include <stdlib.h>
#include <stddef.h>
#include <string.h>

#include "svn_hash.h"
#include "svn_types.h"
#include "svn_error.h"
#include "svn_io.h"
#include "svn_pools.h"
#include "svn_props.h"
#include "svn_string.h"
#include "svn_utf.h"
#include "svn_dirent_uri.h"
#include "svn_diff.h"

#include "private/svn_eol_private.h"
#include "private/svn_dep_compat.h"

/* Helper macro for readability */
#define starts_with(str, start)  \
  (strncmp((str), (start), strlen(start)) == 0)

/* Like strlen() but for string literals. */
#define STRLEN_LITERAL(str) (sizeof(str) - 1)

/* This struct describes a range within a file, as well as the
 * current cursor position within the range. All numbers are in bytes. */
struct svn_diff__hunk_range {
  apr_off_t start;
  apr_off_t end;
  apr_off_t current;
};

struct svn_diff_hunk_t {
  /* The patch this hunk belongs to. */
  svn_patch_t *patch;

  /* APR file handle to the patch file this hunk came from. */
  apr_file_t *apr_file;

  /* Ranges used to keep track of this hunk's texts positions within
   * the patch file. */
  struct svn_diff__hunk_range diff_text_range;
  struct svn_diff__hunk_range original_text_range;
  struct svn_diff__hunk_range modified_text_range;

  /* Hunk ranges as they appeared in the patch file.
   * All numbers are lines, not bytes. */
  svn_linenum_t original_start;
  svn_linenum_t original_length;
  svn_linenum_t modified_start;
  svn_linenum_t modified_length;

  /* Number of lines of leading and trailing hunk context. */
  svn_linenum_t leading_context;
  svn_linenum_t trailing_context;
};

void
svn_diff_hunk_reset_diff_text(svn_diff_hunk_t *hunk)
{
  hunk->diff_text_range.current = hunk->diff_text_range.start;
}

void
svn_diff_hunk_reset_original_text(svn_diff_hunk_t *hunk)
{
  if (hunk->patch->reverse)
    hunk->modified_text_range.current = hunk->modified_text_range.start;
  else
    hunk->original_text_range.current = hunk->original_text_range.start;
}

void
svn_diff_hunk_reset_modified_text(svn_diff_hunk_t *hunk)
{
  if (hunk->patch->reverse)
    hunk->original_text_range.current = hunk->original_text_range.start;
  else
    hunk->modified_text_range.current = hunk->modified_text_range.start;
}

svn_linenum_t
svn_diff_hunk_get_original_start(const svn_diff_hunk_t *hunk)
{
  return hunk->patch->reverse ? hunk->modified_start : hunk->original_start;
}