mirror of
https://github.com/mruby/mruby
synced 2026-06-08 16:11:16 +00:00
Kouhei Sutou
6bb0775d76
Here are some benchmarks:
each_char:
# /tmp/each_char.rb
a = "a" * 1000000
a.each_char do |x|
end
Without this change:
% time bin/mruby /tmp/each_char.rb
bin/mruby /tmp/each_char.rb 1.07s user 0.02s system 99% cpu 1.088 total
With this change:
% time bin/mruby /tmp/each_char.rb
bin/mruby /tmp/each_char.rb 0.52s user 0.01s system 99% cpu 0.530 total
2 times faster with this change.
codepoints:
# /tmp/codepoints.rb
a = "a" * 1000000
a.codepoints do |x|
end
Without this change:
% time bin/mruby /tmp/codepoints.rb
bin/mruby /tmp/codepoints.rb 1.16s user 0.05s system 99% cpu 1.216 total
With this change:
% time bin/mruby /tmp/codepoints.rb
bin/mruby /tmp/codepoints.rb 0.56s user 0.02s system 99% cpu 0.589 total
389 lines
10 KiB
Ruby
389 lines
10 KiB
Ruby
class String
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##
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# call-seq:
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# String.try_convert(obj) -> string or nil
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#
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# Try to convert <i>obj</i> into a String, using to_str method.
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# Returns converted string or nil if <i>obj</i> cannot be converted
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# for any reason.
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#
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# String.try_convert("str") #=> "str"
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# String.try_convert(/re/) #=> nil
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#
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def self.try_convert(obj)
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if obj.respond_to?(:to_str)
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obj.to_str
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else
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nil
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end
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end
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##
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# call-seq:
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# string.clear -> string
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#
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# Makes string empty.
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#
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# a = "abcde"
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# a.clear #=> ""
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#
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def clear
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self.replace("")
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end
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##
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# call-seq:
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# str.lstrip -> new_str
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#
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# Returns a copy of <i>str</i> with leading whitespace removed. See also
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# <code>String#rstrip</code> and <code>String#strip</code>.
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#
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# " hello ".lstrip #=> "hello "
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# "hello".lstrip #=> "hello"
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#
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def lstrip
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a = 0
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z = self.size - 1
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a += 1 while " \f\n\r\t\v".include?(self[a]) and a <= z
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(z >= 0) ? self[a..z] : ""
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end
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##
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# call-seq:
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# str.rstrip -> new_str
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#
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# Returns a copy of <i>str</i> with trailing whitespace removed. See also
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# <code>String#lstrip</code> and <code>String#strip</code>.
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#
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# " hello ".rstrip #=> " hello"
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# "hello".rstrip #=> "hello"
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#
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def rstrip
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a = 0
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z = self.size - 1
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z -= 1 while " \f\n\r\t\v\0".include?(self[z]) and a <= z
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(z >= 0) ? self[a..z] : ""
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end
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##
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# call-seq:
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# str.strip -> new_str
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#
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# Returns a copy of <i>str</i> with leading and trailing whitespace removed.
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#
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# " hello ".strip #=> "hello"
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# "\tgoodbye\r\n".strip #=> "goodbye"
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#
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def strip
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a = 0
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z = self.size - 1
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a += 1 while " \f\n\r\t\v".include?(self[a]) and a <= z
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z -= 1 while " \f\n\r\t\v\0".include?(self[z]) and a <= z
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(z >= 0) ? self[a..z] : ""
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end
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##
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# call-seq:
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# str.lstrip! -> self or nil
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#
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# Removes leading whitespace from <i>str</i>, returning <code>nil</code> if no
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# change was made. See also <code>String#rstrip!</code> and
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# <code>String#strip!</code>.
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#
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# " hello ".lstrip #=> "hello "
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# "hello".lstrip! #=> nil
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#
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def lstrip!
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s = self.lstrip
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(s == self) ? nil : self.replace(s)
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end
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##
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# call-seq:
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# str.rstrip! -> self or nil
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#
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# Removes trailing whitespace from <i>str</i>, returning <code>nil</code> if
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# no change was made. See also <code>String#lstrip!</code> and
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# <code>String#strip!</code>.
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#
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# " hello ".rstrip #=> " hello"
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# "hello".rstrip! #=> nil
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#
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def rstrip!
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s = self.rstrip
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(s == self) ? nil : self.replace(s)
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end
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##
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# call-seq:
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# str.strip! -> str or nil
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#
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# Removes leading and trailing whitespace from <i>str</i>. Returns
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# <code>nil</code> if <i>str</i> was not altered.
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#
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def strip!
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s = self.strip
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(s == self) ? nil : self.replace(s)
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end
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##
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# call-seq:
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# str.casecmp(other_str) -> -1, 0, +1 or nil
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#
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# Case-insensitive version of <code>String#<=></code>.
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#
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# "abcdef".casecmp("abcde") #=> 1
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# "aBcDeF".casecmp("abcdef") #=> 0
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# "abcdef".casecmp("abcdefg") #=> -1
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# "abcdef".casecmp("ABCDEF") #=> 0
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#
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def casecmp(str)
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self.downcase <=> str.to_str.downcase
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rescue NoMethodError
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raise TypeError, "no implicit conversion of #{str.class} into String"
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end
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def partition(sep)
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raise TypeError, "type mismatch: #{sep.class} given" unless sep.is_a? String
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n = index(sep)
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unless n.nil?
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m = n + sep.size
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[ slice(0, n), sep, slice(m, size - m) ]
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else
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[ self, "", "" ]
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end
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end
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def rpartition(sep)
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raise TypeError, "type mismatch: #{sep.class} given" unless sep.is_a? String
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n = rindex(sep)
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unless n.nil?
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m = n + sep.size
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[ slice(0, n), sep, slice(m, size - m) ]
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else
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[ "", "", self ]
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end
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end
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##
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# call-seq:
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# str.slice!(fixnum) -> new_str or nil
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# str.slice!(fixnum, fixnum) -> new_str or nil
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# str.slice!(range) -> new_str or nil
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# str.slice!(other_str) -> new_str or nil
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#
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# Deletes the specified portion from <i>str</i>, and returns the portion
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# deleted.
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#
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# string = "this is a string"
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# string.slice!(2) #=> "i"
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# string.slice!(3..6) #=> " is "
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# string.slice!("r") #=> "r"
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# string #=> "thsa sting"
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#
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def slice!(arg1, arg2=nil)
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raise "wrong number of arguments (for 1..2)" if arg1.nil? && arg2.nil?
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if !arg1.nil? && !arg2.nil?
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idx = arg1
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idx += self.size if arg1 < 0
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if idx >= 0 && idx <= self.size && arg2 > 0
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str = self[idx, arg2]
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else
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return nil
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end
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else
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validated = false
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if arg1.kind_of?(Range)
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beg = arg1.begin
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ed = arg1.end
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beg += self.size if beg < 0
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ed += self.size if ed < 0
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ed -= 1 if arg1.exclude_end?
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validated = true
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elsif arg1.kind_of?(String)
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validated = true
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else
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idx = arg1
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idx += self.size if arg1 < 0
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validated = true if idx >=0 && arg1 < self.size
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end
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if validated
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str = self[arg1]
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else
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return nil
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end
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end
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unless str.nil? || str == ""
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if !arg1.nil? && !arg2.nil?
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idx = arg1 >= 0 ? arg1 : self.size+arg1
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str2 = self[0...idx] + self[idx+arg2..-1].to_s
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else
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if arg1.kind_of?(Range)
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idx = beg >= 0 ? beg : self.size+beg
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idx2 = ed>= 0 ? ed : self.size+ed
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str2 = self[0...idx] + self[idx2+1..-1].to_s
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elsif arg1.kind_of?(String)
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idx = self.index(arg1)
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str2 = self[0...idx] + self[idx+arg1.size..-1] unless idx.nil?
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else
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idx = arg1 >= 0 ? arg1 : self.size+arg1
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str2 = self[0...idx] + self[idx+1..-1].to_s
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end
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end
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self.replace(str2) unless str2.nil?
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end
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str
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end
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##
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# call-seq:
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# str.insert(index, other_str) -> str
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#
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# Inserts <i>other_str</i> before the character at the given
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# <i>index</i>, modifying <i>str</i>. Negative indices count from the
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# end of the string, and insert <em>after</em> the given character.
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# The intent is insert <i>aString</i> so that it starts at the given
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# <i>index</i>.
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#
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# "abcd".insert(0, 'X') #=> "Xabcd"
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# "abcd".insert(3, 'X') #=> "abcXd"
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# "abcd".insert(4, 'X') #=> "abcdX"
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# "abcd".insert(-3, 'X') #=> "abXcd"
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# "abcd".insert(-1, 'X') #=> "abcdX"
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#
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def insert(idx, str)
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if idx == -1
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return self << str
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elsif idx < 0
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idx += 1
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end
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self[idx, 0] = str
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self
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end
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##
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# call-seq:
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# str.ljust(integer, padstr=' ') -> new_str
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#
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# If <i>integer</i> is greater than the length of <i>str</i>, returns a new
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# <code>String</code> of length <i>integer</i> with <i>str</i> left justified
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# and padded with <i>padstr</i>; otherwise, returns <i>str</i>.
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#
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# "hello".ljust(4) #=> "hello"
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# "hello".ljust(20) #=> "hello "
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# "hello".ljust(20, '1234') #=> "hello123412341234123"
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def ljust(idx, padstr = ' ')
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if idx <= self.size
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return self
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end
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newstr = self.dup
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newstr << padstr
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while newstr.size <= idx
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newstr << padstr
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end
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return newstr.slice(0,idx)
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end
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##
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# call-seq:
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# str.rjust(integer, padstr=' ') -> new_str
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#
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# If <i>integer</i> is greater than the length of <i>str</i>, returns a new
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# <code>String</code> of length <i>integer</i> with <i>str</i> right justified
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# and padded with <i>padstr</i>; otherwise, returns <i>str</i>.
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#
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# "hello".rjust(4) #=> "hello"
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# "hello".rjust(20) #=> " hello"
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# "hello".rjust(20, '1234') #=> "123412341234123hello"
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def rjust(idx, padstr = ' ')
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if idx <= self.size
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return self
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end
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padsize = idx - self.size
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newstr = padstr.dup
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while newstr.size <= padsize
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newstr << padstr
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end
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return newstr.slice(0,padsize) + self
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end
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# str.upto(other_str, exclusive=false) {|s| block } -> str
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# str.upto(other_str, exclusive=false) -> an_enumerator
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#
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# Iterates through successive values, starting at <i>str</i> and
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# ending at <i>other_str</i> inclusive, passing each value in turn to
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# the block. The <code>String#succ</code> method is used to generate
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# each value. If optional second argument exclusive is omitted or is false,
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# the last value will be included; otherwise it will be excluded.
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#
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# If no block is given, an enumerator is returned instead.
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#
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# "a8".upto("b6") {|s| print s, ' ' }
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# for s in "a8".."b6"
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# print s, ' '
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# end
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#
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# <em>produces:</em>
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#
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# a8 a9 b0 b1 b2 b3 b4 b5 b6
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# a8 a9 b0 b1 b2 b3 b4 b5 b6
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#
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# If <i>str</i> and <i>other_str</i> contains only ascii numeric characters,
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# both are recognized as decimal numbers. In addition, the width of
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# string (e.g. leading zeros) is handled appropriately.
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#
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# "9".upto("11").to_a #=> ["9", "10", "11"]
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# "25".upto("5").to_a #=> []
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# "07".upto("11").to_a #=> ["07", "08", "09", "10", "11"]
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#
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def upto(other_str, excl=false, &block)
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return to_enum :upto, other_str, excl unless block
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str = self
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n = self.<=>other_str
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return self if n > 0 || (self == other_str && excl)
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while true
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block.call(str)
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return self if !excl && str == other_str
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str = str.succ
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return self if excl && str == other_str
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end
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end
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def chars(&block)
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if block_given?
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self.split('').each do |i|
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block.call(i)
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end
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self
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else
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self.split('')
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end
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end
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def each_char(&block)
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return to_enum :each_char unless block
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split('').each do |i|
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block.call(i)
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end
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self
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end
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def codepoints(&block)
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len = self.size
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if block_given?
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self.split('').each do|x|
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block.call(x.ord)
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end
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self
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else
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self.split('').map{|x| x.ord}
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end
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end
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alias each_codepoint codepoints
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end
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