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<?php |
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namespace ICanBoogie\CLDR\Dates; |
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/** |
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* @link https://www.unicode.org/reports/tr35/tr35-72/tr35-dates.html#Date_Format_Patterns |
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*/ |
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final class DateFormatPatternParser |
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{ |
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private const QUOTE = "'"; |
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/** |
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* Parses a date format pattern. |
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* |
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* @param string $pattern |
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* A date format pattern; for example, "hh 'o''clock' a, zzzz". |
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* |
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* @return array<string|array{ string, int }> |
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* Where _value_ is either a literal or an array where `0` is a pattern character and `1` its length. |
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*/ |
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public static function parse(string $pattern): array |
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{ |
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static $cache = []; |
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return $cache[$pattern] ??= self::do_parse($pattern); |
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} |
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/** |
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* Parses a date format pattern. |
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* |
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* @param string $pattern |
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* A date format pattern; for example, "hh 'o''clock' a, zzzz". |
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* |
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* @return array<string|array{ string, int }> |
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* Where _value_ is either a literal or an array where `0` is a pattern character and `1` its length. |
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*/ |
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private static function do_parse(string $pattern): array |
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{ |
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$tokens = []; |
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$is_literal = false; |
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$literal = ''; |
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$z = mb_strlen($pattern); |
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for ($i = 0; $i < $z; ++$i) { |
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$c = mb_substr($pattern, $i, 1); |
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if ($c === self::QUOTE) { |
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// Two adjacent single vertical quotes (''), which represent a literal single quote, |
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// either inside or outside a quoted text. |
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if (mb_substr($pattern, $i + 1, 1) === self::QUOTE) { |
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$i++; |
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$literal .= self::QUOTE; |
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} else { |
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// Toggle literal |
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$is_literal = !$is_literal; |
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} |
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} elseif ($is_literal) { |
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$literal .= $c; |
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} elseif (ctype_alpha($c)) { |
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if ($literal) { |
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$tokens[] = $literal; |
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$literal = ''; |
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} |
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for ($j = $i + 1; $j < $z; ++$j) { |
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$nc = mb_substr($pattern, $j, 1); |
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if ($nc !== $c) { |
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break; |
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} |
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} |
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$tokens[] = [ $c, $j - $i ]; |
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$i = $j - 1; // because +1 from the for loop |
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} else { |
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$literal .= $c; |
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} |
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} |
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// If the pattern ends with literal (could also be a malformed quote) |
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if ($literal) { |
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$tokens[] = $literal; |
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} |
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return $tokens; |
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} |
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} |
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ICanBoogie /
CLDR
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