diff options
Diffstat (limited to 'src/ed.c')
| -rw-r--r-- | src/ed.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/src/ed.c b/src/ed.c new file mode 100644 index 0000000..1fae2b8 --- /dev/null +++ b/src/ed.c @@ -0,0 +1,175 @@ +/* Output routines for ed-script format. + + Copyright (C) 1988-1989, 1991-1993, 1995, 1998, 2001, 2004, 2006, 2009-2013, + 2015-2016 Free Software Foundation, Inc. + + This file is part of GNU DIFF. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +#include "diff.h" + +static void print_ed_hunk (struct change *); +static void print_rcs_hunk (struct change *); +static void pr_forward_ed_hunk (struct change *); + +/* Print our script as ed commands. */ + +void +print_ed_script (struct change *script) +{ + print_script (script, find_reverse_change, print_ed_hunk); +} + +/* Print a hunk of an ed diff */ + +static void +print_ed_hunk (struct change *hunk) +{ + lin f0, l0, f1, l1; + enum changes changes; + +#ifdef DEBUG + debug_script (hunk); +#endif + + /* Determine range of line numbers involved in each file. */ + changes = analyze_hunk (hunk, &f0, &l0, &f1, &l1); + if (!changes) + return; + + begin_output (); + + /* Print out the line number header for this hunk */ + print_number_range (',', &files[0], f0, l0); + fputc (change_letter[changes], outfile); + fputc ('\n', outfile); + + /* Print new/changed lines from second file, if needed */ + if (changes != OLD) + { + lin i; + bool insert_mode = true; + + for (i = f1; i <= l1; i++) + { + if (!insert_mode) + { + fputs ("a\n", outfile); + insert_mode = true; + } + if (files[1].linbuf[i][0] == '.' && files[1].linbuf[i][1] == '\n') + { + /* The file's line is just a dot, and it would exit + insert mode. Precede the dot with another dot, exit + insert mode and remove the extra dot. */ + fputs ("..\n.\ns/.//\n", outfile); + insert_mode = false; + } + else + print_1_line ("", &files[1].linbuf[i]); + } + + if (insert_mode) + fputs (".\n", outfile); + } +} + +/* Print change script in the style of ed commands, + but print the changes in the order they appear in the input files, + which means that the commands are not truly useful with ed. + Because of the issue with lines containing just a dot, the output + is not even parseable. */ + +void +pr_forward_ed_script (struct change *script) +{ + print_script (script, find_change, pr_forward_ed_hunk); +} + +static void +pr_forward_ed_hunk (struct change *hunk) +{ + lin i, f0, l0, f1, l1; + + /* Determine range of line numbers involved in each file. */ + enum changes changes = analyze_hunk (hunk, &f0, &l0, &f1, &l1); + if (!changes) + return; + + begin_output (); + + fputc (change_letter[changes], outfile); + print_number_range (' ', files, f0, l0); + fputc ('\n', outfile); + + /* If deletion only, print just the number range. */ + + if (changes == OLD) + return; + + /* For insertion (with or without deletion), print the number range + and the lines from file 2. */ + + for (i = f1; i <= l1; i++) + print_1_line ("", &files[1].linbuf[i]); + + fputs (".\n", outfile); +} + +/* Print in a format somewhat like ed commands + except that each insert command states the number of lines it inserts. + This format is used for RCS. */ + +void +print_rcs_script (struct change *script) +{ + print_script (script, find_change, print_rcs_hunk); +} + +/* Print a hunk of an RCS diff */ + +static void +print_rcs_hunk (struct change *hunk) +{ + lin i, f0, l0, f1, l1; + long int tf0, tl0, tf1, tl1; + + /* Determine range of line numbers involved in each file. */ + enum changes changes = analyze_hunk (hunk, &f0, &l0, &f1, &l1); + if (!changes) + return; + + begin_output (); + + translate_range (&files[0], f0, l0, &tf0, &tl0); + + if (changes & OLD) + { + /* For deletion, print just the starting line number from file 0 + and the number of lines deleted. */ + fprintf (outfile, "d%ld %ld\n", tf0, tf0 <= tl0 ? tl0 - tf0 + 1 : 1); + } + + if (changes & NEW) + { + /* Take last-line-number from file 0 and # lines from file 1. */ + translate_range (&files[1], f1, l1, &tf1, &tl1); + fprintf (outfile, "a%ld %ld\n", tl0, tf1 <= tl1 ? tl1 - tf1 + 1 : 1); + + /* Print the inserted lines. */ + for (i = f1; i <= l1; i++) + print_1_line ("", &files[1].linbuf[i]); + } +} |