| 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 | // Convert an ex(1) style pattern from a tags(5) file to a basic POSIX | ||
| 11 | // regex ("BRE"), so that it can be compiled with regcomp(3) | ||
| 12 | 19 | static size_t regex_from_ex_pattern ( | |
| 13 | const char *ex_str, | ||
| 14 | size_t len, | ||
| 15 | char **regex_str // out param | ||
| 16 | ) { | ||
| 17 | 19 | BUG_ON(len == 0); | |
| 18 | 19 | const char open_delim = ex_str[0]; | |
| 19 | 19 | BUG_ON(open_delim != '/' && open_delim != '?'); | |
| 20 | 19 | char *buf = xmalloc(xmul(2, len)); | |
| 21 | |||
| 22 | // The pattern isn't a real regex; special chars need to be escaped | ||
| 23 |
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891 | for (size_t i = 1, j = 0; i < len; i++) { |
| 24 | 890 | char c = ex_str[i]; | |
| 25 |
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890 | if (c == '\0') { |
| 26 | break; | ||
| 27 |
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889 | } else if (c == '\\') { |
| 28 |
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3 | if (unlikely(++i >= len)) { |
| 29 | break; | ||
| 30 | } | ||
| 31 | 3 | c = ex_str[i]; | |
| 32 |
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3 | if (c == '\\') { |
| 33 | // Escape "\\" as "\\" (any other "\x" becomes just "x") | ||
| 34 | 1 | buf[j++] = '\\'; | |
| 35 | } | ||
| 36 |
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886 | } else if (c == '*' || c == '[' || c == ']') { |
| 37 | 28 | buf[j++] = '\\'; | |
| 38 |
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858 | } else if (c == open_delim) { |
| 39 | 17 | buf[j] = '\0'; | |
| 40 | 17 | *regex_str = buf; | |
| 41 | 17 | return i + 1; | |
| 42 | } | ||
| 43 | 872 | buf[j++] = c; | |
| 44 | } | ||
| 45 | |||
| 46 | // End of string reached without a matching end delimiter; invalid input | ||
| 47 | 2 | free(buf); | |
| 48 | 2 | return 0; | |
| 49 | } | ||
| 50 | |||
| 51 | 21 | static size_t parse_ex_cmd(Tag *tag, const char *buf, size_t size) | |
| 52 | { | ||
| 53 |
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21 | if (unlikely(size == 0)) { |
| 54 | return 0; | ||
| 55 | } | ||
| 56 | |||
| 57 | 21 | size_t n; | |
| 58 |
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21 | if (buf[0] == '/' || buf[0] == '?') { |
| 59 | 19 | n = regex_from_ex_pattern(buf, size, &tag->pattern); | |
| 60 | } else { | ||
| 61 | 2 | n = buf_parse_ulong(buf, size, &tag->lineno); | |
| 62 | } | ||
| 63 | |||
| 64 |
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21 | if (n == 0) { |
| 65 | return 0; | ||
| 66 | } | ||
| 67 | |||
| 68 |
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19 | bool trailing_comment = (n + 1 < size) && mem_equal(buf + n, ";\"", 2); |
| 69 | 19 | return n + (trailing_comment ? 2 : 0); | |
| 70 | } | ||
| 71 | |||
| 72 | 21 | bool parse_ctags_line(Tag *tag, const char *line, size_t line_len) | |
| 73 | { | ||
| 74 | 21 | size_t pos = 0; | |
| 75 | 21 | *tag = (Tag){.name = get_delim(line, &pos, line_len, '\t')}; | |
| 76 |
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21 | if (tag->name.length == 0 || pos >= line_len) { |
| 77 | return false; | ||
| 78 | } | ||
| 79 | |||
| 80 | 21 | tag->filename = get_delim(line, &pos, line_len, '\t'); | |
| 81 |
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21 | if (tag->filename.length == 0 || pos >= line_len) { |
| 82 | return false; | ||
| 83 | } | ||
| 84 | |||
| 85 | 21 | size_t len = parse_ex_cmd(tag, line + pos, line_len - pos); | |
| 86 |
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21 | if (len == 0) { |
| 87 | 2 | BUG_ON(tag->pattern); | |
| 88 | return false; | ||
| 89 | } | ||
| 90 | |||
| 91 | 19 | pos += len; | |
| 92 |
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19 | if (pos >= line_len) { |
| 93 | return true; | ||
| 94 | } | ||
| 95 | |||
| 96 | /* | ||
| 97 | * Extension fields (key:[value]): | ||
| 98 | * | ||
| 99 | * file: visibility limited to this file | ||
| 100 | * struct:NAME tag is member of struct NAME | ||
| 101 | * union:NAME tag is member of union NAME | ||
| 102 | * typeref:struct:NAME::MEMBER_TYPE MEMBER_TYPE is type of the tag | ||
| 103 | */ | ||
| 104 |
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18 | if (line[pos++] != '\t') { |
| 105 | // free `pattern` allocated by parse_ex_cmd() | ||
| 106 | 1 | free_tag(tag); | |
| 107 | 1 | tag->pattern = NULL; | |
| 108 | 1 | return false; | |
| 109 | } | ||
| 110 | |||
| 111 |
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55 | while (pos < line_len) { |
| 112 | 38 | StringView field = get_delim(line, &pos, line_len, '\t'); | |
| 113 |
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38 | if (field.length == 1 && ascii_isalpha(field.data[0])) { |
| 114 | 17 | tag->kind = field.data[0]; | |
| 115 |
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21 | } else if (strview_equal_cstring(&field, "file:")) { |
| 116 | 7 | tag->local = true; | |
| 117 | } | ||
| 118 | // TODO: struct/union/typeref | ||
| 119 | } | ||
| 120 | |||
| 121 | return true; | ||
| 122 | } | ||
| 123 | |||
| 124 | 18 | bool next_tag ( | |
| 125 | const char *buf, | ||
| 126 | size_t buf_len, | ||
| 127 | size_t *posp, // in-out param | ||
| 128 | const StringView *prefix, | ||
| 129 | bool exact, | ||
| 130 | Tag *tag // out param | ||
| 131 | ) { | ||
| 132 | 18 | const char *p = prefix->data; | |
| 133 | 18 | size_t plen = prefix->length; | |
| 134 |
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59 | for (size_t pos = *posp; pos < buf_len; ) { |
| 135 | 55 | StringView line = buf_slice_next_line(buf, &pos, buf_len); | |
| 136 | 55 | if ( | |
| 137 |
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55 | line.length > 0 // Line is non-empty |
| 138 |
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55 | && line.data[0] != '!' // and not a comment |
| 139 |
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37 | && strview_has_strn_prefix(&line, p, plen) // and starts with `prefix` |
| 140 |
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15 | && (!exact || line.data[plen] == '\t') // and matches `prefix` exactly, if applicable |
| 141 |
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14 | && parse_ctags_line(tag, line.data, line.length) // and is a valid tags(5) entry |
| 142 | ) { | ||
| 143 | // Advance the position; `tag` has been filled by parse_ctags_line() | ||
| 144 | 14 | *posp = pos; | |
| 145 | 14 | return true; | |
| 146 | } | ||
| 147 | } | ||
| 148 | |||
| 149 | // No matching tags remaining | ||
| 150 | 4 | return false; | |
| 151 | } | ||
| 152 | |||
| 153 | // NOTE: tag itself is not freed | ||
| 154 | 22 | void free_tag(Tag *tag) | |
| 155 | { | ||
| 156 | 22 | free(tag->pattern); | |
| 157 | 22 | } | |
| 158 |