| |
| <?php |
|
|
| if ($argc < 2) { |
| echo "Usage: php gen_rare_cp_bitvec.php ./common_codepoints.txt\n"; |
| return; |
| } |
|
|
| $bitvec = array_fill(0, (0xFFFF / 32) + 1, 0xFFFFFFFF); |
|
|
| $input = file_get_contents($argv[1]); |
| foreach (explode("\n", $input) as $line) { |
| if (false !== $hashPos = strpos($line, '#')) { |
| $line = substr($line, 0, $hashPos); |
| } |
|
|
| $line = trim($line); |
| if ($line === '') { |
| continue; |
| } |
|
|
| $range = explode("\t", $line); |
| $start = hexdec($range[0]); |
| $end = hexdec($range[1]); |
|
|
| for ($i = $start; $i <= $end; $i++) { |
| $bitvec[$i >> 5] &= ~(1 << ($i & 0x1F)); |
| } |
| } |
|
|
| $result = <<<'HEADER' |
| /* Machine-generated file; do not edit! See gen_rare_cp_bitvec.php. |
| * |
| * The below array has one bit for each Unicode codepoint from U+0000 to U+FFFF. |
| * The bit is 1 if the codepoint is considered 'rare' for the purpose of |
| * guessing the text encoding of a string. |
| * |
| * Each 'rare' codepoint which appears in a string when it is interpreted |
| * using a candidate encoding causes the candidate encoding to be treated |
| * as less likely to be the correct one. |
| */ |
| |
| static const uint32_t rare_codepoint_bitvec[] = { |
| HEADER; |
|
|
| for ($i = 0; $i < 0xFFFF / 32; $i++) { |
| if ($i % 8 === 0) { |
| $result .= "\n"; |
| } else { |
| $result .= " "; |
| } |
|
|
| $result .= "0x" . str_pad(dechex($bitvec[$i]), 8, '0', STR_PAD_LEFT) . ","; |
| } |
|
|
| $result .= "\n};\n"; |
|
|
| file_put_contents(__DIR__ . '/rare_cp_bitvec.h', $result); |
|
|
| echo "Done.\n"; |
| ?> |
|
|
