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112 lines
3.3 KiB
PHP
112 lines
3.3 KiB
PHP
<?php
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declare(strict_types=1);
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namespace MRBS\Intl;
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class IntlDatePatternConverter
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{
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private const QUOTE_CHAR = "'";
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private $formatter;
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public function __construct(Formatter $formatter)
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{
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$this->formatter = $formatter;
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}
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public function convert(string $pattern) : string
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{
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// Parse the pattern
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// See https://unicode-org.github.io/icu/userguide/format_parse/datetime/
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// "Note: Any characters in the pattern that are not in the ranges of [‘a’..’z’] and
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// [‘A’..’Z’] will be treated as quoted text. For instance, characters like ':', '.',
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// ' ', '#' and '@' will appear in the resulting time text even they are not enclosed
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// within single quotes. The single quote is used to ‘escape’ letters. Two single
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// quotes in a row, whether inside or outside a quoted sequence, represent a ‘real’
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// single quote."
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$format = '';
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$token = '';
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$token_char = null;
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$in_quotes = false;
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// Split the string into an array of multibyte characters
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$chars = preg_split("//u", $pattern, 0, PREG_SPLIT_NO_EMPTY);
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while (null !== ($char = array_shift($chars)))
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{
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$is_token_char = !$in_quotes && preg_match("/^[a-z]$/i", $char);
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if ($is_token_char)
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{
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// The start of a token
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if (!isset($token_char))
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{
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$token_char = $char;
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$token = $char;
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}
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// The continuation of a token
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elseif ($char === $token_char)
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{
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$token .= $char;
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}
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// The end of a token and the beginning of a new one
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else
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{
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$format .= $this->formatter->convert($token);
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$token_char = $char;
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$token = $char;
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}
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}
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// Check to see if a token has just ended, ie we've either got
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// a non-token character or there are no more characters left.
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if (($token !== '') && (!$is_token_char || empty($chars)))
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{
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$format .= $this->formatter->convert($token);
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$token = '';
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$token_char = null;
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}
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// Quoted text
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if (!$is_token_char)
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{
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// If it's not a quote just add the character to the format
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if ($char !== self::QUOTE_CHAR)
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{
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$format .= $this->formatter->escape($char);
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}
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// Otherwise we have to work out whether the quote is the start or end of a
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// quoted sequence, or part of an escaped quote
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else
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{
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// Get the next character
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$char = array_shift($chars);
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if (isset($char))
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{
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// If it is a quote then it's an escaped quote and add it to the format
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if ($char === self::QUOTE_CHAR)
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{
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$format .= $this->formatter->escape($char);
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}
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// Otherwise it's either the start or end of a quoted section.
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// Toggle $in_quotes and add the character to the format if we're in quotes,
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// or else replace it so that it gets handled properly next time round.
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else
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{
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$in_quotes = !$in_quotes;
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if ($in_quotes)
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{
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$format .= $this->formatter->escape($char);
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}
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else
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{
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array_unshift($chars, $char);
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}
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}
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}
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}
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}
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}
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return $format;
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}
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}
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