ws.c

   1 /*
   2  * Whitespace rules
   3  *
   4  * Copyright (c) 2007 Junio C Hamano
   5  */
   6
   7 #include "cache.h"
   8 #include "attr.h"
   9
  10 static struct whitespace_rule {
  11         const char *rule_name;
  12         unsigned rule_bits;
  13 } whitespace_rule_names[] = {
  14         { "trailing-space", WS_TRAILING_SPACE },
  15         { "space-before-tab", WS_SPACE_BEFORE_TAB },
  16         { "indent-with-non-tab", WS_INDENT_WITH_NON_TAB },
  17 };
  18
  19 unsigned parse_whitespace_rule(const char *string)
  20 {
  21         unsigned rule = WS_DEFAULT_RULE;
  22
  23         while (string) {
  24                 int i;
  25                 size_t len;
  26                 const char *ep;
  27                 int negated = 0;
  28
  29                 string = string + strspn(string, ", \t\n\r");
  30                 ep = strchr(string, ',');
  31                 if (!ep)
  32                         len = strlen(string);
  33                 else
  34                         len = ep - string;
  35
  36                 if (*string == '-') {
  37                         negated = 1;
  38                         string++;
  39                         len--;
  40                 }
  41                 if (!len)
  42                         break;
  43                 for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++) {
  44                         if (strncmp(whitespace_rule_names[i].rule_name,
  45                                     string, len))
  46                                 continue;
  47                         if (negated)
  48                                 rule &= ~whitespace_rule_names[i].rule_bits;
  49                         else
  50                                 rule |= whitespace_rule_names[i].rule_bits;
  51                         break;
  52                 }
  53                 string = ep;
  54         }
  55         return rule;
  56 }
  57
  58 static void setup_whitespace_attr_check(struct git_attr_check *check)
  59 {
  60         static struct git_attr *attr_whitespace;
  61
  62         if (!attr_whitespace)
  63                 attr_whitespace = git_attr("whitespace", 10);
  64         check[0].attr = attr_whitespace;
  65 }
  66
  67 unsigned whitespace_rule(const char *pathname)
  68 {
  69         struct git_attr_check attr_whitespace_rule;
  70
  71         setup_whitespace_attr_check(&attr_whitespace_rule);
  72         if (!git_checkattr(pathname, 1, &attr_whitespace_rule)) {
  73                 const char *value;
  74
  75                 value = attr_whitespace_rule.value;
  76                 if (ATTR_TRUE(value)) {
  77                         /* true (whitespace) */
  78                         unsigned all_rule = 0;
  79                         int i;
  80                         for (i = 0; i < ARRAY_SIZE(whitespace_rule_names); i++)
  81                                 all_rule |= whitespace_rule_names[i].rule_bits;
  82                         return all_rule;
  83                 } else if (ATTR_FALSE(value)) {
  84                         /* false (-whitespace) */
  85                         return 0;
  86                 } else if (ATTR_UNSET(value)) {
  87                         /* reset to default (!whitespace) */
  88                         return whitespace_rule_cfg;
  89                 } else {
  90                         /* string */
  91                         return parse_whitespace_rule(value);
  92                 }
  93         } else {
  94                 return whitespace_rule_cfg;
  95         }
  96 }