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PHPの標準関数をRubyで書く（文字列操作編）

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はじめに

PHPの標準関数をRubyで書いてみました。
簡単に書けそうなものだけパズル感覚で書いてます。

文字列操作編です。

引数と返り値の型はテーブルで記載しました。

str_contains($haystack, $needle)

PHP: str_contains - Manual
haystack String
needle String
return TrueClass | FalseClass
Ruby
haystack.include?(needle)

str_ends_with($haystack, $needle)

PHP: str_ends_with - Manual
haystack String
needle String
return TrueClass | FalseClass
Ruby
haystack.end_with?(needle)

str_getcsv ($string, $separator, $enclosure, $escape)

PHP: str_getcsv - Manual
string String
separator String
enclosure String
escape 標準CSVライブラリでは指定不可
(2回続けて入力してエスケープ)
return Array<String>
Ruby
require "csv"
CSV.parse_line(string, col_sep: separator, quote_char: enclosure)

str_ireplace($search, $replace, $subject, &$count)

PHP: str_ireplace - Manual
search String
replace String
subject String
count Integer
return String
Ruby
count = 0
subject.gsub(Regexp.new(Regexp.escape(search), Regexp::IGNORECASE)) {count += 1; replace}

str_pad($string, $length, $pad_string, $pad_type)

PHP: str_pad - Manual
string String
length Integer
pad_string String
pad_type STR_PAD_RIGHT
return String
Ruby
string.ljust(length, pad_string)
string String
length Integer
pad_string String
pad_type STR_PAD_LEFT
return String
Ruby
string.rjust(length, pad_string)
string String
length Integer
pad_string String
pad_type STR_PAD_BOTH
return String
Ruby
string.center(length, pad_string)

str_repeat($string, $times)

PHP: str_repeat - Manual
string String
times Integer
return String
Ruby
string * times

str_replace($search, $replace, $subject, &$count)

PHP: str_replace - Manual
search String
replace String
subject String
count Integer
return String
Ruby
count = 0
subject.gsub(Regexp.new(Regexp.escape(search))) {count += 1; replace}

str_rot13($string)

PHP: str_rot13 - Manual
string String
return String
Ruby
string.tr("a-zA-Z", "n-za-mN-ZA-M")

str_shuffle($string)

PHP: str_shuffle - Manual
string String
return String
Ruby
string.chars.shuffle.join

str_split($string, $length)

PHP: str_split - Manual
string String
length Integer ※1以上
return String
Ruby
string.each_char.each_slice(length).map(&:join)

str_starts_with($haystack, $needle)

PHP: str_starts_with - Manual
haystack String
needle String
return TrueClass | FalseClass
Ruby
haystack.start_with?(needle)

str_word_count($string, $format, $characters)

PHP: str_word_count - Manual
string String
format 0
characters String
return Integer
Ruby
string.match(/^[-']*(.*?)-*$/)[1].scan(/[-'a-zA-Z]+/).count
string String
format 1
characters String
return Array<String>
Ruby
string.match(/^[-']*(.*?)-*$/)[1].scan(/[-'a-zA-Z]+/)

strcasecmp($str1, $str2)

PHP: strcasecmp - Manual
str1 String
str2 String
return Integer
Ruby
str1.casecmp(str2)

※返却値は-1, 0, 1のいずれかなので注意

strcmp($str1, $str2)

PHP: strcmp - Manual
str1 String
str2 String
return Integer
Ruby
str1 <=> str2

※返却値は-1, 0, 1のいずれかなので注意

strcspn($string, $characters, $offset, $length)

PHP: strcspn - Manual
string String
characters String
offset Integer
length Integer ※0以上
return Integer
Ruby
string = string[offset, length]
string.chars.each_with_index.find { |c, _| characters.include?(c) }&.at(1) || string.length

stripos($haystack, $needle, $offset)

PHP: stripos - Manual
haystack String
needle String
offset Integer
return String | FalseClass
Ruby
haystack.downcase.index(needle.downcase, offset)

stristr($haystack, $needle, $before_needle)

PHP: stristr - Manual
haystack String
needle String
before_needle FalseClass
return String | FalseClass
Ruby
haystack.chars.each_with_index.find { |c, _| c.casecmp?(needle) }.then { |_, i| i ? haystack[i..] : false }
haystack String
needle String
before_needle TrueClass
return String | FalseClass
Ruby
haystack.chars.each_with_index.find { |c, _| c.casecmp?(needle) }.then { |_, i| i ? haystack[0, i] : false }

strlen($string)

PHP: strlen - Manual
string String
return Integer
Ruby
string.length

strncasecmp($str1, $str2, $length)

PHP: strncasecmp - Manual
str1 String
str2 String
length Integer
return Integer
Ruby
str1[0, length].casecmp(str2[0, length])

※返却値は-1, 0, 1のいずれかなので注意

strncmp($str1, $str2, $length)

PHP: strncmp - Manual
str1 String
str2 String
length Integer
return Integer
Ruby
str1[0, length] <=> str2[0, length]

※返却値は-1, 0, 1のいずれかなので注意

strpbrk($string, $characters)

PHP: strpbrk - Manual
string String
characters String
return String | FalseClass
Ruby
string.chars.each_with_index.find { |c, _| characters.include?(c) }.then { |_, i| i ? string[i..] : false }

strpos($haystack, $needle, $offset)

PHP: strpos - Manual
haystack String
needle String
offset Integer
return String | FalseClass
Ruby
haystack.index(needle, offset)

strrchr($haystack, $needle)

PHP: strrchr - Manual
haystack String
needle String
return String | FalseClass
Ruby
haystack.chars.reverse.each_with_index.find { |c, _| c == needle.chr }.then { |_, i| i ? haystack[-i-1..] : false }

strrev($string)

PHP: strrev - Manual
string String
return String
Ruby
string.reverse

strripos($haystack, $needle, $offset)

PHP: strripos - Manual
haystack String
needle String
offset Integer ※0以上
return String | FalseClass
Ruby
haystack[offset..].downcase.rindex(needle.downcase)&.+(offset) || false
haystack String
needle String
offset Integer ※0未満
return String | FalseClass
Ruby
haystack.downcase.rindex(needle.downcase, offset) || false

strrpos($haystack, $needle, $offset)

PHP: strrpos - Manual
haystack String
needle String
offset Integer ※0以上
return String | FalseClass
Ruby
haystack[offset..].rindex(needle)&.+(offset) || false
haystack String
needle String
offset Integer ※0未満
return String | FalseClass
Ruby
haystack.rindex(needle, offset) || false

strspn($string, $characters, $offset, $length)

PHP: strspn - Manual
string String
characters String
offset Integer
length Integer ※0以上
return Integer
Ruby
string = string[offset, length]
string.chars.each_with_index.find { |c, _| !characters.include?(c) }&.at(1) || string.length

strstr($haystack, $needle, $before_needle)

PHP: strstr - Manual
haystack String
needle String
before_needle FalseClass
return String | FalseClass
Ruby
haystack.chars.each_with_index.find { |c, _| c == needle }.then { |_, i| i ? haystack[i..] : false }
haystack String
needle String
before_needle TrueClass
return String | FalseClass
Ruby
haystack.chars.each_with_index.find { |c, _| c == needle }.then { |_, i| i ? haystack[0, i] : false }

strtolower($string)

PHP: strtolower - Manual
string String
return String
Ruby
string.downcase

strtoupper($string)

PHP: strtoupper - Manual
string String
return String
Ruby
string.upcase

strtr($string, $from, $to)

PHP: strtr - Manual
string String
from String
to String
return String
Ruby
limit = [from, to].map(&:length).min
string.tr(from[0, limit], to[0, limit])

strtr($string, $replace_pairs)

PHP: strtr - Manual
string String
replace_pairs Hash<String, String>
return String
Ruby
string.gsub(Regexp.new(replace_pairs.keys.map { |s| Regexp.escape(s) }.join('|'))) { |m| replace_pairs[m] }

参考文献

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