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lstrip.rb
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lstrip.rb
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#
# lstrip.rb
#
# Copyright 2012 Krzysztof Wilczynski
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
module Puppet::Parser::Functions
newfunction(:lstrip, :type => :rvalue, :doc => <<-EOS
Return either a new array or string by removing whitespace characters on the
left-hand side from elements within.
Prototype:
lstrip(x)
Where x is either an array type or string value.
For example:
Given the following statements:
$a = ' abc'
$b = ' def '
$c = [' gh', ' i ', 'j ']
notice lstrip($a)
notice lstrip($b)
notice dump($b)
notice dump(lstrip($b))
notice dump($c)
notice dump(lstrip($c))
The result will be as follows:
notice: Scope(Class[main]): abc
notice: Scope(Class[main]): def
notice: Scope(Class[main]): " def "
notice: Scope(Class[main]): "def "
notice: Scope(Class[main]): [" gh", " i ", "j "]
notice: Scope(Class[main]): ["gh", "i ", "j "]
EOS
) do |*arguments|
#
# This is to ensure that whenever we call this function from within
# the Puppet manifest or alternatively form a template it will always
# do the right thing ...
#
arguments = arguments.shift if arguments.first.is_a?(Array)
raise Puppet::ParseError, "lstrip(): Wrong number of arguments " +
"given (#{arguments.size} for 1)" if arguments.size < 1
value = arguments.shift
unless [Array, String].include?(value.class)
raise Puppet::ParseError, 'lstrip(): Requires either array ' +
'or string to work with'
end
if value.is_a?(Array)
value.collect { |i| i.is_a?(String) ? i.lstrip : i }
else
value.lstrip
end
end
end
# vim: set ts=2 sw=2 et :
# encoding: utf-8