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|---|---|---|---|
| 1 | #include <string.h> | ||
| 2 | #include <sys/types.h> | ||
| 3 | #include "indent.h" | ||
| 4 | #include "regexp.h" | ||
| 5 | #include "util/xmalloc.h" | ||
| 6 | |||
| 7 | 47 | String make_indent(const LocalOptions *options, size_t width) | |
| 8 | { | ||
| 9 |
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47 | if (width == 0) { |
| 10 | 20 | return string_new(0); | |
| 11 | } | ||
| 12 | |||
| 13 | 27 | bool use_spaces = use_spaces_for_indent(options); | |
| 14 | 27 | size_t tw = options->tab_width; | |
| 15 |
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27 | size_t ntabs = use_spaces ? 0 : indent_level(width, tw); |
| 16 | 4 | size_t nspaces = use_spaces ? width : indent_remainder(width, tw); | |
| 17 | 27 | size_t nbytes = ntabs + nspaces; | |
| 18 | 27 | BUG_ON(nbytes == 0); | |
| 19 | |||
| 20 | 27 | String str = string_new(nbytes + 1); // +1 for efficiency in several callers | |
| 21 | 27 | memset(str.buffer, '\t', ntabs); | |
| 22 | 27 | memset(str.buffer + ntabs, ' ', nspaces); | |
| 23 | 27 | str.len = nbytes; | |
| 24 | 27 | return str; | |
| 25 | } | ||
| 26 | |||
| 27 | // Return true if the contents of `line` triggers an additional level | ||
| 28 | // of auto-indent on the next line | ||
| 29 | 37 | static bool line_contents_increases_indent ( | |
| 30 | const LocalOptions *options, | ||
| 31 | StringView line | ||
| 32 | ) { | ||
| 33 |
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37 | if (!line.length) { |
| 34 | return false; | ||
| 35 | } | ||
| 36 | |||
| 37 | 36 | static const regex_t *re1, *re2; | |
| 38 |
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36 | if (!re1) { |
| 39 | // TODO: Make these patterns configurable via a local option | ||
| 40 | 1 | re1 = regexp_compile_or_fatal_error("\\{[\t ]*(//.*|/\\*.*\\*/[\t ]*)?$"); | |
| 41 | 1 | re2 = regexp_compile_or_fatal_error("\\}[\t ]*(//.*|/\\*.*\\*/[\t ]*)?$"); | |
| 42 | } | ||
| 43 | |||
| 44 |
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36 | if (options->brace_indent) { |
| 45 |
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13 | if (regexp_exec(re1, line.data, line.length, 0, NULL, 0)) { |
| 46 | return true; | ||
| 47 | } | ||
| 48 |
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12 | if (regexp_exec(re2, line.data, line.length, 0, NULL, 0)) { |
| 49 | return false; | ||
| 50 | } | ||
| 51 | } | ||
| 52 | |||
| 53 | 35 | const InternedRegexp *ir = options->indent_regex; | |
| 54 |
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35 | if (!ir) { |
| 55 | return false; | ||
| 56 | } | ||
| 57 | |||
| 58 | 2 | BUG_ON(ir->str[0] == '\0'); | |
| 59 | 2 | return regexp_exec(&ir->re, line.data, line.length, 0, NULL, 0); | |
| 60 | } | ||
| 61 | |||
| 62 | 37 | String get_indent_for_next_line(const LocalOptions *options, StringView line) | |
| 63 | { | ||
| 64 | 37 | size_t curr_width = get_indent_width(line, options->tab_width); | |
| 65 | 37 | size_t next_width = next_indent_width(curr_width, options->indent_width); | |
| 66 | 37 | bool increase = line_contents_increases_indent(options, line); | |
| 67 |
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72 | return make_indent(options, increase ? next_width : curr_width); |
| 68 | } | ||
| 69 | |||
| 70 | 64 | IndentInfo get_indent_info(const LocalOptions *options, StringView line) | |
| 71 | { | ||
| 72 | 64 | const char *buf = line.data; | |
| 73 | 64 | const size_t len = line.length; | |
| 74 | 64 | const size_t tw = options->tab_width; | |
| 75 | 64 | const size_t iw = options->indent_width; | |
| 76 | 64 | const bool space_indent = use_spaces_for_indent(options); | |
| 77 | 64 | IndentInfo info = {.sane = true}; | |
| 78 | 64 | size_t spaces = 0; | |
| 79 | 64 | size_t tabs = 0; | |
| 80 | 64 | size_t pos = 0; | |
| 81 | |||
| 82 |
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636 | for (; pos < len; pos++) { |
| 83 |
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631 | if (buf[pos] == ' ') { |
| 84 | 564 | info.width++; | |
| 85 | 564 | spaces++; | |
| 86 |
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67 | } else if (buf[pos] == '\t') { |
| 87 | 8 | info.width = next_indent_width(info.width, tw); | |
| 88 | 8 | tabs++; | |
| 89 | } else { | ||
| 90 | break; | ||
| 91 | } | ||
| 92 |
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572 | if (indent_remainder(info.width, iw) == 0 && info.sane) { |
| 93 |
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145 | info.sane = space_indent ? !tabs : !spaces; |
| 94 | } | ||
| 95 | } | ||
| 96 | |||
| 97 | 64 | info.level = indent_level(info.width, iw); | |
| 98 | 64 | info.wsonly = (pos == len); | |
| 99 | 64 | info.bytes = spaces + tabs; | |
| 100 | 64 | return info; | |
| 101 | } | ||
| 102 | |||
| 103 | 45 | size_t get_indent_width(StringView line, unsigned int tab_width) | |
| 104 | { | ||
| 105 | 45 | const char *buf = line.data; | |
| 106 | 45 | size_t width = 0; | |
| 107 |
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133 | for (size_t i = 0, n = line.length; i < n; i++) { |
| 108 |
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129 | if (buf[i] == ' ') { |
| 109 | 88 | width++; | |
| 110 |
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41 | } else if (buf[i] == '\t') { |
| 111 | ✗ | width = next_indent_width(width, tab_width); | |
| 112 | } else { | ||
| 113 | break; | ||
| 114 | } | ||
| 115 | } | ||
| 116 | 45 | return width; | |
| 117 | } | ||
| 118 | |||
| 119 | 22 | static ssize_t get_current_indent_bytes ( | |
| 120 | const char *buf, | ||
| 121 | size_t cursor_offset, | ||
| 122 | unsigned int iw, | ||
| 123 | unsigned int tw | ||
| 124 | ) { | ||
| 125 | 22 | size_t bytes = 0; | |
| 126 | 22 | size_t width = 0; | |
| 127 | |||
| 128 |
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22 | for (size_t i = 0; i < cursor_offset; i++) { |
| 129 |
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20 | if (indent_remainder(width, iw) == 0) { |
| 130 | 20 | bytes = 0; | |
| 131 | 20 | width = 0; | |
| 132 | } | ||
| 133 |
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20 | switch (buf[i]) { |
| 134 | ✗ | case '\t': | |
| 135 | ✗ | width = next_indent_width(width, tw); | |
| 136 | ✗ | break; | |
| 137 | ✗ | case ' ': | |
| 138 | ✗ | width++; | |
| 139 | ✗ | break; | |
| 140 | default: | ||
| 141 | // Cursor not at indentation | ||
| 142 | return -1; | ||
| 143 | } | ||
| 144 | ✗ | bytes++; | |
| 145 | } | ||
| 146 | |||
| 147 |
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2 | if (indent_remainder(width, iw)) { |
| 148 | // Cursor at middle of indentation level | ||
| 149 | return -1; | ||
| 150 | } | ||
| 151 | |||
| 152 | 2 | return (ssize_t)bytes; | |
| 153 | } | ||
| 154 | |||
| 155 | 3 | size_t get_indent_level_bytes_left(const LocalOptions *options, const BlockIter *cursor) | |
| 156 | { | ||
| 157 | 3 | BlockIter bol = *cursor; | |
| 158 | 3 | size_t cursor_offset = block_iter_bol(&bol); | |
| 159 |
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3 | if (cursor_offset == 0) { |
| 160 | return 0; // cursor at BOL | ||
| 161 | } | ||
| 162 | |||
| 163 | 3 | StringView line = block_iter_get_line(&bol); | |
| 164 | 3 | unsigned int iw = options->indent_width; | |
| 165 | 3 | unsigned int tw = options->tab_width; | |
| 166 | 3 | ssize_t ibytes = get_current_indent_bytes(line.data, cursor_offset, iw, tw); | |
| 167 | 3 | return MAX(ibytes, 0); | |
| 168 | } | ||
| 169 | |||
| 170 | 19 | size_t get_indent_level_bytes_right(const LocalOptions *options, const BlockIter *cursor) | |
| 171 | { | ||
| 172 | 19 | unsigned int iw = options->indent_width; | |
| 173 | 19 | unsigned int tw = options->tab_width; | |
| 174 | 19 | CurrentLineRef lr = get_current_line_and_offset(*cursor); | |
| 175 | 19 | ssize_t ibytes = get_current_indent_bytes(lr.line.data, lr.cursor_offset, iw, tw); | |
| 176 |
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19 | if (ibytes < 0) { |
| 177 | return 0; | ||
| 178 | } | ||
| 179 | |||
| 180 | 2 | size_t width = 0; | |
| 181 |
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3 | for (size_t i = lr.cursor_offset, n = lr.line.length; i < n; i++) { |
| 182 |
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3 | switch (lr.line.data[i]) { |
| 183 | ✗ | case '\t': | |
| 184 | ✗ | width = next_indent_width(width, tw); | |
| 185 | ✗ | break; | |
| 186 | 1 | case ' ': | |
| 187 | 1 | width++; | |
| 188 | 1 | break; | |
| 189 | default: | ||
| 190 | // No full indentation level at cursor position | ||
| 191 | return 0; | ||
| 192 | } | ||
| 193 |
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1 | if (indent_remainder(width, iw) == 0) { |
| 194 | ✗ | return i - lr.cursor_offset + 1; | |
| 195 | } | ||
| 196 | } | ||
| 197 | |||
| 198 | return 0; | ||
| 199 | } | ||
| 200 |