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# The MIT License
#
# Copyright (c) 2004-2008 Reginald Braithwaite
# Portions Copyright (c) 2006 Oliver Steele
# <http://braythwayt.com> except as otherwise noted.
#
# See http://weblog.raganwald.com/2007/10/stringtoproc.html
#
# Ported from the String Lambdas in Oliver Steele's Functional JavaScript
# http://osteele.com/sources/javascript/functional/
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above Copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# http://www.opensource.org/licenses/mit-license.php
class String
unless ''.respond_to?(:to_proc)
def to_proc &block
params = []
expr = self
sections = expr.split(/\s*->\s*/m)
if sections.length > 1 then
eval sections.reverse!.inject { |e, p| "(Proc.new { |#{p.split(/\s/).join(', ')}| #{e} })" }, block && block.binding
elsif expr.match(/\b_\b/)
eval "Proc.new { |_| #{expr} }", block && block.binding
else
leftSection = expr.match(/^\s*(?:[+*\/%&|\^\.=<>\[]|!=)/m)
rightSection = expr.match(/[+\-*\/%&|\^\.=<>!]\s*$/m)
if leftSection || rightSection then
if (leftSection) then
params.push('$left')
expr = '$left' + expr
end
if (rightSection) then
params.push('$right')
expr = expr + '$right'
end
else
self.gsub(
/(?:\b[A-Z]|\.[a-zA-Z_$])[a-zA-Z_$\d]*|[a-zA-Z_$][a-zA-Z_$\d]*:|self|arguments|'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"/, ''
).scan(
/([a-z_$][a-z_$\d]*)/i
) do |v|
params.push(v) unless params.include?(v)
end
end
eval "Proc.new { |#{params.join(', ')}| #{expr} }", block && block.binding
end
end
end
end
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