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Contents
require 'puppet/parser/ast/lambda'
Puppet::Parser::Functions::newfunction(
:filter,
:type => :rvalue,
:arity => 2,
:doc => <<-'ENDHEREDOC') do |args|
Applies a parameterized block to each element in a sequence of entries from the first
argument and returns an array or hash (same type as left operand)
with the entries for which the block evaluates to true.
This function takes two mandatory arguments: the first should be an Array or a Hash, and the second
a parameterized block as produced by the puppet syntax:
$a.filter |$x| { ... }
When the first argument is an Array, the block is called with each entry in turn. When the first argument
is a Hash the entry is an array with `[key, value]`.
The returned filtered object is of the same type as the receiver.
*Examples*
# selects all that end with berry
$a = ["raspberry", "blueberry", "orange"]
$a.filter |$x| { $x =~ /berry$/ }
- Since 3.4
- requires `parser = future`.
ENDHEREDOC
receiver = args[0]
pblock = args[1]
raise ArgumentError, ("filter(): wrong argument type (#{pblock.class}; must be a parameterized block.") unless pblock.is_a? Puppet::Parser::AST::Lambda
case receiver
when Array
receiver.select {|x| pblock.call(self, x) }
when Hash
result = receiver.select {|x, y| pblock.call(self, [x, y]) }
# Ruby 1.8.7 returns Array
result = Hash[result] unless result.is_a? Hash
result
else
raise ArgumentError, ("filter(): wrong argument type (#{receiver.class}; must be an Array or a Hash.")
end
end
Version data entries
6 entries across 6 versions & 1 rubygems