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/* Output routines for ed-script format.
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Copyright (C) 1988-1989, 1991-1993, 1995, 1998, 2001, 2004, 2006, 2009-2013,
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2015-2017 Free Software Foundation, Inc.
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This file is part of GNU DIFF.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "diff.h"
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static void print_ed_hunk (struct change *);
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static void print_rcs_hunk (struct change *);
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static void pr_forward_ed_hunk (struct change *);
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/* Print our script as ed commands. */
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void
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print_ed_script (struct change *script)
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{
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print_script (script, find_reverse_change, print_ed_hunk);
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}
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/* Print a hunk of an ed diff */
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static void
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print_ed_hunk (struct change *hunk)
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{
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lin f0, l0, f1, l1;
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enum changes changes;
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#ifdef DEBUG
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debug_script (hunk);
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#endif
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/* Determine range of line numbers involved in each file. */
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changes = analyze_hunk (hunk, &f0, &l0, &f1, &l1;;
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if (!changes)
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return;
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begin_output ();
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/* Print out the line number header for this hunk */
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print_number_range (',', &files[0], f0, l0);
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fputc (change_letter[changes], outfile);
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fputc ('\n', outfile);
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/* Print new/changed lines from second file, if needed */
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if (changes != OLD)
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{
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lin i;
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bool insert_mode = true;
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for (i = f1; i <= l1; i++)
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{
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if (!insert_mode)
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{
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fputs ("a\n", outfile);
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insert_mode = true;
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}
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if (files[1].linbuf[i][0] == '.' && files[1].linbuf[i][1] == '\n')
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{
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/* The file's line is just a dot, and it would exit
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insert mode. Precede the dot with another dot, exit
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insert mode and remove the extra dot. */
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fputs ("..\n.\ns/.//\n", outfile);
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insert_mode = false;
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}
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else
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print_1_line ("", &files[1].linbuf[i]);
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}
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if (insert_mode)
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fputs (".\n", outfile);
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}
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}
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/* Print change script in the style of ed commands,
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but print the changes in the order they appear in the input files,
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which means that the commands are not truly useful with ed.
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Because of the issue with lines containing just a dot, the output
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is not even parseable. */
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void
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pr_forward_ed_script (struct change *script)
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{
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print_script (script, find_change, pr_forward_ed_hunk);
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}
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static void
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pr_forward_ed_hunk (struct change *hunk)
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{
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lin i, f0, l0, f1, l1;
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/* Determine range of line numbers involved in each file. */
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enum changes changes = analyze_hunk (hunk, &f0, &l0, &f1, &l1;;
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if (!changes)
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return;
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begin_output ();
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fputc (change_letter[changes], outfile);
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print_number_range (' ', files, f0, l0);
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fputc ('\n', outfile);
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/* If deletion only, print just the number range. */
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if (changes == OLD)
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return;
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/* For insertion (with or without deletion), print the number range
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and the lines from file 2. */
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for (i = f1; i <= l1; i++)
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print_1_line ("", &files[1].linbuf[i]);
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fputs (".\n", outfile);
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}
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/* Print in a format somewhat like ed commands
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except that each insert command states the number of lines it inserts.
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This format is used for RCS. */
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void
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print_rcs_script (struct change *script)
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{
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print_script (script, find_change, print_rcs_hunk);
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}
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/* Print a hunk of an RCS diff */
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static void
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print_rcs_hunk (struct change *hunk)
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{
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lin i, f0, l0, f1, l1;
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printint tf0, tl0, tf1, tl1;
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/* Determine range of line numbers involved in each file. */
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enum changes changes = analyze_hunk (hunk, &f0, &l0, &f1, &l1;;
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if (!changes)
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return;
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begin_output ();
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translate_range (&files[0], f0, l0, &tf0, &tl0);
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if (changes & OLD)
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{
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/* For deletion, print just the starting line number from file 0
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and the number of lines deleted. */
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fprintf (outfile, "d%"pI"d %"pI"d\n", tf0,
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tf0 <= tl0 ? tl0 - tf0 + 1 : 1);
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}
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if (changes & NEW)
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{
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/* Take last-line-number from file 0 and # lines from file 1. */
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translate_range (&files[1], f1, l1, &tf1, &tl1);
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fprintf (outfile, "a%"pI"d %"pI"d\n", tl0,
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tf1 <= tl1 ? tl1 - tf1 + 1 : 1);
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/* Print the inserted lines. */
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for (i = f1; i <= l1; i++)
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print_1_line ("", &files[1].linbuf[i]);
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}
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}
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