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1 | <?php |
2 | /** |
3 | * @author: Doug Wilbourne (dougwilbourne@gmail.com) |
4 | */ |
5 | |
6 | declare(strict_types=1); |
7 | |
8 | namespace pvc\parser\date_time; |
9 | |
10 | use DateTimeZone; |
11 | use IntlDateFormatter; |
12 | use pvc\interfaces\intl\LocaleInterface; |
13 | use pvc\interfaces\msg\MsgInterface; |
14 | use pvc\parser\err\InvalidDateTimeTypeException; |
15 | use pvc\parser\Parser; |
16 | |
17 | /** |
18 | * Class ParserDateTime |
19 | * @extends Parser<float> |
20 | * |
21 | * wrapper for the IntlDateFormatter class. |
22 | * parsedValue is a timestamp. This class has no notion of whether the pattern in IntlDateFormatter permits |
23 | * fractions of a second or not so the data type for the parsedValue (e.g. the generic data type for the class) |
24 | * is float, not int. |
25 | * |
26 | * The locale and timezone attributes look like they might be redundant because IntlDateFormatter also |
27 | * has those attributes. However, in order to keep everything pvc-branded (encapsulated), this object |
28 | * has properties which are the pvc implementations of these concepts. The IntlDateFormatter returns a string |
29 | * from getLocale and an IntlTimeZone object from getTimeZone, so the attributes in this class are just object instances |
30 | * of the correct type which can be returned from the getters. |
31 | */ |
32 | abstract class ParserDateTime extends Parser |
33 | { |
34 | |
35 | protected LocaleInterface $locale; |
36 | |
37 | protected DateTimeZone $timeZone; |
38 | |
39 | protected int $dateType; |
40 | |
41 | protected int $timeType; |
42 | |
43 | protected int $calendarType; |
44 | |
45 | public function __construct( |
46 | MsgInterface $msg, |
47 | LocaleInterface $locale, |
48 | DateTimeZone $timeZone, |
49 | ) { |
50 | parent::__construct($msg); |
51 | $this->setLocale($locale); |
52 | $this->setTimeZone($timeZone); |
53 | $this->setDateType(IntlDateFormatter::NONE); |
54 | $this->setTimeType(IntlDateFormatter::NONE); |
55 | $this->setCalendarType(IntlDateFormatter::GREGORIAN); |
56 | } |
57 | |
58 | public function getLocale(): LocaleInterface |
59 | { |
60 | return $this->locale; |
61 | } |
62 | |
63 | public function setLocale(LocaleInterface $locale): void |
64 | { |
65 | $this->locale = $locale; |
66 | } |
67 | |
68 | public function getTimeZone(): DateTimeZone |
69 | { |
70 | return $this->timeZone; |
71 | } |
72 | |
73 | public function setTimeZone(DateTimeZone $timeZone): void |
74 | { |
75 | $this->timeZone = $timeZone; |
76 | } |
77 | |
78 | public function getDateType(): int |
79 | { |
80 | return $this->dateType; |
81 | } |
82 | |
83 | public function setDateType(int $dateType): void |
84 | { |
85 | $validDateTypes = [ |
86 | IntlDateFormatter::NONE, |
87 | IntlDateFormatter::FULL, |
88 | IntlDateFormatter::LONG, |
89 | IntlDateFormatter::MEDIUM, |
90 | IntlDateFormatter::SHORT, |
91 | IntlDateFormatter::RELATIVE_FULL, |
92 | IntlDateFormatter::RELATIVE_LONG, |
93 | IntlDateFormatter::RELATIVE_MEDIUM, |
94 | IntlDateFormatter::RELATIVE_SHORT, |
95 | ]; |
96 | if (!in_array($dateType, $validDateTypes)) { |
97 | throw new InvalidDateTimeTypeException(); |
98 | } |
99 | $this->dateType = $dateType; |
100 | } |
101 | |
102 | public function getTimeType(): int |
103 | { |
104 | return $this->timeType; |
105 | } |
106 | |
107 | public function setTimeType(int $timeType): void |
108 | { |
109 | $validTimeTypes = [ |
110 | IntlDateFormatter::NONE, |
111 | IntlDateFormatter::FULL, |
112 | IntlDateFormatter::LONG, |
113 | IntlDateFormatter::MEDIUM, |
114 | IntlDateFormatter::SHORT, |
115 | ]; |
116 | if (!in_array($timeType, $validTimeTypes)) { |
117 | throw new InvalidDateTimeTypeException(); |
118 | } |
119 | $this->timeType = $timeType; |
120 | } |
121 | |
122 | public function getCalendarType(): int |
123 | { |
124 | return $this->calendarType; |
125 | } |
126 | |
127 | public function setCalendarType(int $calendarType): void |
128 | { |
129 | $validCalendarTypes = [IntlDateFormatter::GREGORIAN, IntlDateFormatter::TRADITIONAL]; |
130 | if (!in_array($calendarType, $validCalendarTypes)) { |
131 | throw new InvalidDateTimeTypeException(); |
132 | } |
133 | $this->calendarType = $calendarType; |
134 | } |
135 | |
136 | /** |
137 | * @function parseValue |
138 | * @param string $data |
139 | * @return bool |
140 | */ |
141 | public function parseValue(string $data): bool |
142 | { |
143 | $formatter = new IntlDateFormatter( |
144 | (string)$this->locale, |
145 | $this->getDateType(), |
146 | $this->getTimeType(), |
147 | $this->getTimeZone(), |
148 | $this->getCalendarType() |
149 | ); |
150 | $pos = 0; |
151 | $expectedPos = strlen($data); |
152 | $result = $formatter->parse($data, $pos); |
153 | |
154 | /** |
155 | * IntlDateFormatter 'fails gracefully' if it successfully parses a part of a string, e.g. it will not throw |
156 | * an exception if it parses the first x characters of the string into the return type and can't parse any |
157 | * more from the x + 1 character to the end of the string. The $pos variable holds the offset of the last |
158 | * character successfully parsed. |
159 | * |
160 | * There is also the possibility that it parses the whole string but the result is false. I came across an |
161 | * date time combination where this was the case: try parsing the date / time '5/9/96 23:14' with the en_US |
162 | * locale. It expects an am/pm designation and does not permit the hours to be more than 12. So it gets to |
163 | * the end of the string but the parse is unsuccessful. |
164 | * |
165 | */ |
166 | if (($pos == $expectedPos) && ($result !== false)) { |
167 | $this->parsedValue = $result; |
168 | return true; |
169 | } else { |
170 | return false; |
171 | } |
172 | } |
173 | |
174 | abstract protected function setMsgContent(MsgInterface $msg): void; |
175 | } |