| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #include <stdlib.h> | ||
| 2 | #include "ctags.h" | ||
| 3 | #include "util/arith.h" | ||
| 4 | #include "util/ascii.h" | ||
| 5 | #include "util/debug.h" | ||
| 6 | #include "util/str-util.h" | ||
| 7 | #include "util/strtonum.h" | ||
| 8 | #include "util/xmalloc.h" | ||
| 9 | #include "util/xstring.h" | ||
| 10 | |||
| 11 | // Convert an ex(1) style pattern from a tags(5) file to a basic POSIX | ||
| 12 | // regex ("BRE"), so that it can be compiled with regcomp(3) | ||
| 13 | 19 | static size_t regex_from_ex_pattern ( | |
| 14 | const char *ex_str, | ||
| 15 | size_t len, | ||
| 16 | char **regex_str // out param | ||
| 17 | ) { | ||
| 18 | 19 | BUG_ON(len == 0); | |
| 19 | 19 | const char open_delim = ex_str[0]; | |
| 20 | 19 | BUG_ON(open_delim != '/' && open_delim != '?'); | |
| 21 | 19 | char *buf = xmalloc(xmul(2, len)); | |
| 22 | |||
| 23 | // The pattern isn't a real regex; special chars need to be escaped | ||
| 24 |
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891 | for (size_t i = 1, j = 0; i < len; i++) { |
| 25 | 890 | char c = ex_str[i]; | |
| 26 |
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890 | if (c == '\0') { |
| 27 | break; | ||
| 28 |
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889 | } else if (c == '\\') { |
| 29 |
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3 | if (unlikely(++i >= len)) { |
| 30 | break; | ||
| 31 | } | ||
| 32 | 3 | c = ex_str[i]; | |
| 33 |
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3 | if (c == '\\') { |
| 34 | // Escape "\\" as "\\" (any other "\x" becomes just "x") | ||
| 35 | 1 | buf[j++] = '\\'; | |
| 36 | } | ||
| 37 |
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886 | } else if (c == '*' || c == '[' || c == ']') { |
| 38 | 28 | buf[j++] = '\\'; | |
| 39 |
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858 | } else if (c == open_delim) { |
| 40 | 17 | buf[j] = '\0'; | |
| 41 | 17 | *regex_str = buf; | |
| 42 | 17 | return i + 1; | |
| 43 | } | ||
| 44 | 872 | buf[j++] = c; | |
| 45 | } | ||
| 46 | |||
| 47 | // End of string reached without a matching end delimiter; invalid input | ||
| 48 | 2 | free(buf); | |
| 49 | 2 | return 0; | |
| 50 | } | ||
| 51 | |||
| 52 | 21 | static size_t parse_ex_cmd(Tag *tag, const char *buf, size_t size) | |
| 53 | { | ||
| 54 |
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21 | if (unlikely(size == 0)) { |
| 55 | return 0; | ||
| 56 | } | ||
| 57 | |||
| 58 | 21 | size_t n; | |
| 59 |
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21 | if (buf[0] == '/' || buf[0] == '?') { |
| 60 | 19 | n = regex_from_ex_pattern(buf, size, &tag->pattern); | |
| 61 | } else { | ||
| 62 | 2 | n = buf_parse_ulong(buf, size, &tag->lineno); | |
| 63 | } | ||
| 64 | |||
| 65 |
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21 | if (n == 0) { |
| 66 | return 0; | ||
| 67 | } | ||
| 68 | |||
| 69 |
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19 | bool trailing_comment = (n + 1 < size) && mem_equal(buf + n, ";\"", 2); |
| 70 | 19 | return n + (trailing_comment ? 2 : 0); | |
| 71 | } | ||
| 72 | |||
| 73 | 21 | bool parse_ctags_line(Tag *tag, const char *line, size_t line_len) | |
| 74 | { | ||
| 75 | 21 | size_t pos = 0; | |
| 76 | 21 | *tag = (Tag){.name = get_delim(line, &pos, line_len, '\t')}; | |
| 77 |
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21 | if (tag->name.length == 0 || pos >= line_len) { |
| 78 | return false; | ||
| 79 | } | ||
| 80 | |||
| 81 | 21 | tag->filename = get_delim(line, &pos, line_len, '\t'); | |
| 82 |
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21 | if (tag->filename.length == 0 || pos >= line_len) { |
| 83 | return false; | ||
| 84 | } | ||
| 85 | |||
| 86 | 21 | size_t len = parse_ex_cmd(tag, line + pos, line_len - pos); | |
| 87 |
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21 | if (len == 0) { |
| 88 | 2 | BUG_ON(tag->pattern); | |
| 89 | return false; | ||
| 90 | } | ||
| 91 | |||
| 92 | 19 | pos += len; | |
| 93 |
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19 | if (pos >= line_len) { |
| 94 | return true; | ||
| 95 | } | ||
| 96 | |||
| 97 | /* | ||
| 98 | * Extension fields (key:[value]): | ||
| 99 | * | ||
| 100 | * file: visibility limited to this file | ||
| 101 | * struct:NAME tag is member of struct NAME | ||
| 102 | * union:NAME tag is member of union NAME | ||
| 103 | * typeref:struct:NAME::MEMBER_TYPE MEMBER_TYPE is type of the tag | ||
| 104 | */ | ||
| 105 |
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18 | if (line[pos++] != '\t') { |
| 106 | // free `pattern` allocated by parse_ex_cmd() | ||
| 107 | 1 | free_tag(tag); | |
| 108 | 1 | tag->pattern = NULL; | |
| 109 | 1 | return false; | |
| 110 | } | ||
| 111 | |||
| 112 |
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55 | while (pos < line_len) { |
| 113 | 38 | StringView field = get_delim(line, &pos, line_len, '\t'); | |
| 114 |
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38 | if (field.length == 1 && ascii_isalpha(field.data[0])) { |
| 115 | 17 | tag->kind = field.data[0]; | |
| 116 |
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21 | } else if (strview_equal_cstring(&field, "file:")) { |
| 117 | 7 | tag->local = true; | |
| 118 | } | ||
| 119 | // TODO: struct/union/typeref | ||
| 120 | } | ||
| 121 | |||
| 122 | return true; | ||
| 123 | } | ||
| 124 | |||
| 125 | 18 | bool next_tag ( | |
| 126 | const char *buf, | ||
| 127 | size_t buf_len, | ||
| 128 | size_t *posp, // in-out param | ||
| 129 | const StringView *prefix, | ||
| 130 | bool exact, | ||
| 131 | Tag *tag // out param | ||
| 132 | ) { | ||
| 133 | 18 | const char *p = prefix->data; | |
| 134 | 18 | size_t plen = prefix->length; | |
| 135 |
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59 | for (size_t pos = *posp; pos < buf_len; ) { |
| 136 | 55 | StringView line = buf_slice_next_line(buf, &pos, buf_len); | |
| 137 | 55 | if ( | |
| 138 |
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55 | line.length > 0 // Line is non-empty |
| 139 |
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55 | && line.data[0] != '!' // and not a comment |
| 140 |
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37 | && strview_has_strn_prefix(&line, p, plen) // and starts with `prefix` |
| 141 |
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15 | && (!exact || line.data[plen] == '\t') // and matches `prefix` exactly, if applicable |
| 142 |
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14 | && parse_ctags_line(tag, line.data, line.length) // and is a valid tags(5) entry |
| 143 | ) { | ||
| 144 | // Advance the position; `tag` has been filled by parse_ctags_line() | ||
| 145 | 14 | *posp = pos; | |
| 146 | 14 | return true; | |
| 147 | } | ||
| 148 | } | ||
| 149 | |||
| 150 | // No matching tags remaining | ||
| 151 | 4 | return false; | |
| 152 | } | ||
| 153 | |||
| 154 | // NOTE: tag itself is not freed | ||
| 155 | 22 | void free_tag(Tag *tag) | |
| 156 | { | ||
| 157 | 22 | free(tag->pattern); | |
| 158 | 22 | } | |
| 159 |