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# File 'lib/ruleby.rb', line 26
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
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