| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #include <stdlib.h> | ||
| 2 | #include "ctags.h" | ||
| 3 | #include "util/ascii.h" | ||
| 4 | #include "util/debug.h" | ||
| 5 | #include "util/str-util.h" | ||
| 6 | #include "util/strtonum.h" | ||
| 7 | #include "util/xmalloc.h" | ||
| 8 | #include "util/xstring.h" | ||
| 9 | |||
| 10 | 19 | static size_t parse_ex_pattern(const char *buf, size_t size, char **escaped) | |
| 11 | { | ||
| 12 | 19 | BUG_ON(size == 0); | |
| 13 | 19 | BUG_ON(buf[0] != '/' && buf[0] != '?'); | |
| 14 | |||
| 15 | // The search pattern is not a real regular expression; special characters | ||
| 16 | // need to be escaped | ||
| 17 | 19 | char *pattern = xmalloc(size * 2); | |
| 18 | 19 | char open_delim = buf[0]; | |
| 19 |
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891 | for (size_t i = 1, j = 0; i < size; i++) { |
| 20 |
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890 | if (unlikely(buf[i] == '\0')) { |
| 21 | break; | ||
| 22 | } | ||
| 23 |
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889 | if (buf[i] == '\\' && i + 1 < size) { |
| 24 | 3 | i++; | |
| 25 |
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3 | if (buf[i] == '\\') { |
| 26 | 1 | pattern[j++] = '\\'; | |
| 27 | } | ||
| 28 | 3 | pattern[j++] = buf[i]; | |
| 29 | 3 | continue; | |
| 30 | } | ||
| 31 |
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886 | if (buf[i] == open_delim) { |
| 32 | 17 | pattern[j] = '\0'; | |
| 33 | 17 | *escaped = pattern; | |
| 34 | 17 | return i + 1; | |
| 35 | } | ||
| 36 | 869 | char c = buf[i]; | |
| 37 |
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869 | if (c == '*' || c == '[' || c == ']') { |
| 38 | 28 | pattern[j++] = '\\'; | |
| 39 | } | ||
| 40 | 869 | pattern[j++] = buf[i]; | |
| 41 | } | ||
| 42 | |||
| 43 | 2 | free(pattern); | |
| 44 | 2 | return 0; | |
| 45 | } | ||
| 46 | |||
| 47 | 21 | static size_t parse_ex_cmd(Tag *tag, const char *buf, size_t size) | |
| 48 | { | ||
| 49 |
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21 | if (unlikely(size == 0)) { |
| 50 | return 0; | ||
| 51 | } | ||
| 52 | |||
| 53 | 21 | size_t n; | |
| 54 |
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21 | if (buf[0] == '/' || buf[0] == '?') { |
| 55 | 19 | n = parse_ex_pattern(buf, size, &tag->pattern); | |
| 56 | } else { | ||
| 57 | 2 | n = buf_parse_ulong(buf, size, &tag->lineno); | |
| 58 | } | ||
| 59 | |||
| 60 |
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21 | if (n == 0) { |
| 61 | return 0; | ||
| 62 | } | ||
| 63 | |||
| 64 |
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19 | if (n + 1 < size && mem_equal(buf + n, ";\"", 2)) { |
| 65 | 16 | n += 2; | |
| 66 | } | ||
| 67 | |||
| 68 | return n; | ||
| 69 | } | ||
| 70 | |||
| 71 | 21 | bool parse_ctags_line(Tag *tag, const char *line, size_t line_len) | |
| 72 | { | ||
| 73 | 21 | size_t pos = 0; | |
| 74 | 21 | *tag = (Tag){.name = get_delim(line, &pos, line_len, '\t')}; | |
| 75 |
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21 | if (tag->name.length == 0 || pos >= line_len) { |
| 76 | return false; | ||
| 77 | } | ||
| 78 | |||
| 79 | 21 | tag->filename = get_delim(line, &pos, line_len, '\t'); | |
| 80 |
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21 | if (tag->filename.length == 0 || pos >= line_len) { |
| 81 | return false; | ||
| 82 | } | ||
| 83 | |||
| 84 | 21 | size_t len = parse_ex_cmd(tag, line + pos, line_len - pos); | |
| 85 |
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21 | if (len == 0) { |
| 86 | 2 | BUG_ON(tag->pattern); | |
| 87 | return false; | ||
| 88 | } | ||
| 89 | |||
| 90 | 19 | pos += len; | |
| 91 |
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19 | if (pos >= line_len) { |
| 92 | return true; | ||
| 93 | } | ||
| 94 | |||
| 95 | /* | ||
| 96 | * Extension fields (key:[value]): | ||
| 97 | * | ||
| 98 | * file: visibility limited to this file | ||
| 99 | * struct:NAME tag is member of struct NAME | ||
| 100 | * union:NAME tag is member of union NAME | ||
| 101 | * typeref:struct:NAME::MEMBER_TYPE MEMBER_TYPE is type of the tag | ||
| 102 | */ | ||
| 103 |
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18 | if (line[pos++] != '\t') { |
| 104 | // free `pattern` allocated by parse_ex_cmd() | ||
| 105 | 1 | free_tag(tag); | |
| 106 | 1 | tag->pattern = NULL; | |
| 107 | 1 | return false; | |
| 108 | } | ||
| 109 | |||
| 110 |
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55 | while (pos < line_len) { |
| 111 | 38 | StringView field = get_delim(line, &pos, line_len, '\t'); | |
| 112 |
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38 | if (field.length == 1 && ascii_isalpha(field.data[0])) { |
| 113 | 17 | tag->kind = field.data[0]; | |
| 114 |
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21 | } else if (strview_equal_cstring(&field, "file:")) { |
| 115 | 7 | tag->local = true; | |
| 116 | } | ||
| 117 | // TODO: struct/union/typeref | ||
| 118 | } | ||
| 119 | |||
| 120 | return true; | ||
| 121 | } | ||
| 122 | |||
| 123 | 18 | bool next_tag ( | |
| 124 | const char *buf, | ||
| 125 | size_t buf_len, | ||
| 126 | size_t *posp, // in-out param | ||
| 127 | const StringView *prefix, | ||
| 128 | bool exact, | ||
| 129 | Tag *tag // out param | ||
| 130 | ) { | ||
| 131 | 18 | const char *p = prefix->data; | |
| 132 | 18 | size_t plen = prefix->length; | |
| 133 |
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59 | for (size_t pos = *posp; pos < buf_len; ) { |
| 134 | 55 | StringView line = buf_slice_next_line(buf, &pos, buf_len); | |
| 135 | 55 | if ( | |
| 136 |
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55 | line.length > 0 // Line is non-empty |
| 137 |
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55 | && line.data[0] != '!' // and not a comment |
| 138 |
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37 | && strview_has_strn_prefix(&line, p, plen) // and starts with `prefix` |
| 139 |
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15 | && (!exact || line.data[plen] == '\t') // or matches `prefix` exactly, if applicable |
| 140 |
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14 | && parse_ctags_line(tag, line.data, line.length) // and is a valid tags(5) entry |
| 141 | ) { | ||
| 142 | // Advance the position; `tag` param has been filled by parse_ctags_line() | ||
| 143 | 14 | *posp = pos; | |
| 144 | 14 | return true; | |
| 145 | } | ||
| 146 | } | ||
| 147 | |||
| 148 | // No matching tags remaining | ||
| 149 | 4 | return false; | |
| 150 | } | ||
| 151 | |||
| 152 | // NOTE: tag itself is not freed | ||
| 153 | 22 | void free_tag(Tag *tag) | |
| 154 | { | ||
| 155 | 22 | free(tag->pattern); | |
| 156 | 22 | } | |
| 157 |