1 /* Output routines for ed-script format.
2 Copyright (C) 1988, 89, 91, 92, 93, 1998 Free Software Foundation, Inc.
3
4 This file is part of GNU DIFF.
5
6 GNU DIFF is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 GNU DIFF is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 */
17
18 #include "diff.h"
19
20 static void print_ed_hunk PARAMS((struct change *));
21 static void print_rcs_hunk PARAMS((struct change *));
22 static void pr_forward_ed_hunk PARAMS((struct change *));
23
24 /* Print our script as ed commands. */
25
26 void
print_ed_script(script)27 print_ed_script (script)
28 struct change *script;
29 {
30 print_script (script, find_reverse_change, print_ed_hunk);
31 }
32
33 /* Print a hunk of an ed diff */
34
35 static void
print_ed_hunk(hunk)36 print_ed_hunk (hunk)
37 struct change *hunk;
38 {
39 int f0, l0, f1, l1;
40 int deletes, inserts;
41
42 #if 0
43 hunk = flip_script (hunk);
44 #endif
45 #ifdef DEBUG
46 debug_script (hunk);
47 #endif
48
49 /* Determine range of line numbers involved in each file. */
50 analyze_hunk (hunk, &f0, &l0, &f1, &l1, &deletes, &inserts);
51 if (!deletes && !inserts)
52 return;
53
54 begin_output ();
55
56 /* Print out the line number header for this hunk */
57 print_number_range (',', &files[0], f0, l0);
58 printf_output ("%c\n", change_letter (inserts, deletes));
59
60 /* Print new/changed lines from second file, if needed */
61 if (inserts)
62 {
63 int i;
64 int inserting = 1;
65 for (i = f1; i <= l1; i++)
66 {
67 /* Resume the insert, if we stopped. */
68 if (! inserting)
69 printf_output ("%da\n",
70 i - f1 + translate_line_number (&files[0], f0) - 1);
71 inserting = 1;
72
73 /* If the file's line is just a dot, it would confuse `ed'.
74 So output it with a double dot, and set the flag LEADING_DOT
75 so that we will output another ed-command later
76 to change the double dot into a single dot. */
77
78 if (files[1].linbuf[i][0] == '.'
79 && files[1].linbuf[i][1] == '\n')
80 {
81 printf_output ("..\n");
82 printf_output (".\n");
83 /* Now change that double dot to the desired single dot. */
84 printf_output ("%ds/^\\.\\././\n",
85 i - f1 + translate_line_number (&files[0], f0));
86 inserting = 0;
87 }
88 else
89 /* Line is not `.', so output it unmodified. */
90 print_1_line ("", &files[1].linbuf[i]);
91 }
92
93 /* End insert mode, if we are still in it. */
94 if (inserting)
95 printf_output (".\n");
96 }
97 }
98
99 /* Print change script in the style of ed commands,
100 but print the changes in the order they appear in the input files,
101 which means that the commands are not truly useful with ed. */
102
103 void
pr_forward_ed_script(script)104 pr_forward_ed_script (script)
105 struct change *script;
106 {
107 print_script (script, find_change, pr_forward_ed_hunk);
108 }
109
110 static void
pr_forward_ed_hunk(hunk)111 pr_forward_ed_hunk (hunk)
112 struct change *hunk;
113 {
114 int i;
115 int f0, l0, f1, l1;
116 int deletes, inserts;
117
118 /* Determine range of line numbers involved in each file. */
119 analyze_hunk (hunk, &f0, &l0, &f1, &l1, &deletes, &inserts);
120 if (!deletes && !inserts)
121 return;
122
123 begin_output ();
124
125 printf_output ("%c", change_letter (inserts, deletes));
126 print_number_range (' ', files, f0, l0);
127 printf_output ("\n");
128
129 /* If deletion only, print just the number range. */
130
131 if (!inserts)
132 return;
133
134 /* For insertion (with or without deletion), print the number range
135 and the lines from file 2. */
136
137 for (i = f1; i <= l1; i++)
138 print_1_line ("", &files[1].linbuf[i]);
139
140 printf_output (".\n");
141 }
142
143 /* Print in a format somewhat like ed commands
144 except that each insert command states the number of lines it inserts.
145 This format is used for RCS. */
146
147 void
print_rcs_script(script)148 print_rcs_script (script)
149 struct change *script;
150 {
151 print_script (script, find_change, print_rcs_hunk);
152 }
153
154 /* Print a hunk of an RCS diff */
155
156 static void
print_rcs_hunk(hunk)157 print_rcs_hunk (hunk)
158 struct change *hunk;
159 {
160 int i;
161 int f0, l0, f1, l1;
162 int deletes, inserts;
163 int tf0, tl0, tf1, tl1;
164
165 /* Determine range of line numbers involved in each file. */
166 analyze_hunk (hunk, &f0, &l0, &f1, &l1, &deletes, &inserts);
167 if (!deletes && !inserts)
168 return;
169
170 begin_output ();
171
172 translate_range (&files[0], f0, l0, &tf0, &tl0);
173
174 if (deletes)
175 {
176 printf_output ("d");
177 /* For deletion, print just the starting line number from file 0
178 and the number of lines deleted. */
179 printf_output ("%d %d\n",
180 tf0,
181 (tl0 >= tf0 ? tl0 - tf0 + 1 : 1));
182 }
183
184 if (inserts)
185 {
186 printf_output ("a");
187
188 /* Take last-line-number from file 0 and # lines from file 1. */
189 translate_range (&files[1], f1, l1, &tf1, &tl1);
190 printf_output ("%d %d\n",
191 tl0,
192 (tl1 >= tf1 ? tl1 - tf1 + 1 : 1));
193
194 /* Print the inserted lines. */
195 for (i = f1; i <= l1; i++)
196 print_1_line ("", &files[1].linbuf[i]);
197 }
198 }
199