summaryrefslogtreecommitdiff
path: root/src/lib/elementary/elm_code_indent.c
blob: 5002e950771e61410f71f973b783210765cfcbc7 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
#ifdef HAVE_CONFIG_H
# include "elementary_config.h"
#endif

#include "regex.h"
#include "Elementary.h"

#include "elm_code_private.h"

static Eina_Bool
elm_code_line_indent_startswith_keyword(Elm_Code_Line *line)
{
   regex_t regex;
   char *text;
   int ret;
   unsigned int textlen;

   text = (char *)elm_code_line_text_get(line, &textlen);
   text = strndup(text, textlen);

   ret = regcomp(&regex, "^\\s*("
                         "((if|else\\s*if|while|for|switch)\\s*\\(.*\\)\\s*\\{?)|"
                         "((else|do)\\s*\\{?)|"
                         "(case\\s+.+:)|"
                         "(default:)"
                         ")\\s*$", REG_EXTENDED | REG_NOSUB);
   if (ret)
     {
        regfree(&regex);
        return EINA_FALSE;
     }

   ret = regexec(&regex, text, 0, NULL, 0);
   regfree(&regex);
   free(text);

   return ret == 0;
}

EAPI char *
elm_code_line_indent_get(Elm_Code_Line *line)
{
   Elm_Code_Line *prevline;
   const char *prevtext;
   unsigned int prevlength, count = 0;
   char *buf, *ptr;
   char next, last;

   if (line->number <= 1)
     return strdup("");

   prevline = elm_code_file_line_get(line->file, line->number - 1);
   prevtext = elm_code_line_text_get(prevline, &prevlength);

   ptr = (char *)prevtext;
   buf = malloc((prevlength + 5) * sizeof(char));
   while (count < prevlength)
     {
        if (!_elm_code_text_char_is_whitespace(*ptr))
          break;

        count++;
        ptr++;
     }

   strncpy(buf, prevtext, count);
   buf[count] = '\0';

   if (elm_code_line_indent_startswith_keyword(prevline))
     {
        strcpy(buf + count, "  ");
        count += 2;
     }

   if (count < prevlength)
     {
        next = *ptr;
        last = prevtext[prevlength - 1];

        // comment handling
        // TODO this should all be based on comment SCOPE not text matching
        if (next == '/')
          {
             if (count == prevlength - 1)
               return buf;

             if (*(ptr+1) == '/')
               strcpy(buf + count, "//");
             else if (*(ptr+1) == '*')
               strcpy(buf + count, " * ");
          }
        else if (next == '*')
          {
             if (count < prevlength - 1 && *(ptr+1) == ' ')
               strcpy(buf + count, "* ");
             else if (count < prevlength - 1 && *(ptr+1) == '/')
               {
                  if (count >= 1)
                    buf[count-1] = '\0';
               }
             else
               strcpy(buf + count, "*");
          }
        // VERY simple handling of braces
        else if (last == '{')
          {
             strcpy(buf + count, "   ");
          }
        else if (last == '}')
          {
             if (count >= 2)
               buf[count-2] = '\0';
             else if (count >= 1)
               buf[count-1] = '\0';
          }
     }
   return buf;
}

EAPI const char *
elm_code_line_indent_matching_braces_get(Elm_Code_Line *line, unsigned int *length)
{
   Elm_Code_File *file;
   int stack, row;
   unsigned int len_tmp, count = 0;
   const char *content, *ptr;

   file = line->file;
   stack = 0;
   row = line->number - 1;
   *length = 0;

   while (row > 0)
     {
        line = elm_code_file_line_get(file, row);
        content = elm_code_line_text_get(line, &len_tmp);

        if (memchr(content, '{', len_tmp)) stack--;
        else if (memchr(content, '}', len_tmp)) stack++;

        if (stack < 0)
          {
             if (len_tmp == 0)
               return "";

             ptr = content;
             while (count < len_tmp)
               {
                  if (!_elm_code_text_char_is_whitespace(*ptr))
                    break;

                  count++;
                  ptr++;
               }

             *length = count;
             return content;
          }
        row--;
     }
   return "";
}