summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--lib/puppet/parser/functions/to_bytes.rb28
-rwxr-xr-xspec/unit/puppet/parser/functions/to_bytes_spec.rb58
2 files changed, 86 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/to_bytes.rb b/lib/puppet/parser/functions/to_bytes.rb
new file mode 100644
index 0000000..8ff73d1
--- /dev/null
+++ b/lib/puppet/parser/functions/to_bytes.rb
@@ -0,0 +1,28 @@
+module Puppet::Parser::Functions
+ newfunction(:to_bytes, :type => :rvalue, :doc => <<-EOS
+ Converts the argument into bytes, for example 4 kB becomes 4096.
+ Takes a single string value as an argument.
+ EOS
+ ) do |arguments|
+
+ raise(Puppet::ParseError, "to_bytes(): Wrong number of arguments " +
+ "given (#{arguments.size} for 1)") if arguments.size != 1
+
+ arg = arguments[0]
+
+ return arg if arg.is_a? Numeric
+
+ value,prefix = */([0-9.e+-]*)\s*([^bB]?)/.match(arg)[1,2]
+
+ value = value.to_f
+ case prefix
+ when '' then return value.to_i
+ when 'k' then return (value*(1<<10)).to_i
+ when 'M' then return (value*(1<<20)).to_i
+ when 'G' then return (value*(1<<30)).to_i
+ when 'T' then return (value*(1<<40)).to_i
+ when 'E' then return (value*(1<<50)).to_i
+ else raise Puppet::ParseError, "to_bytes(): Unknown prefix #{prefix}"
+ end
+ end
+end
diff --git a/spec/unit/puppet/parser/functions/to_bytes_spec.rb b/spec/unit/puppet/parser/functions/to_bytes_spec.rb
new file mode 100755
index 0000000..d1ea4c8
--- /dev/null
+++ b/spec/unit/puppet/parser/functions/to_bytes_spec.rb
@@ -0,0 +1,58 @@
+#! /usr/bin/env ruby -S rspec
+
+require 'spec_helper'
+
+describe "the to_bytes function" do
+ let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
+
+ it "should exist" do
+ Puppet::Parser::Functions.function("to_bytes").should == "function_to_bytes"
+ end
+
+ it "should raise a ParseError if there is less than 1 arguments" do
+ lambda { scope.function_to_bytes([]) }.should( raise_error(Puppet::ParseError))
+ end
+
+ it "should convert kB to B" do
+ result = scope.function_to_bytes(["4 kB"])
+ result.should(eq(4096))
+ end
+
+ it "should work without B in unit" do
+ result = scope.function_to_bytes(["4 k"])
+ result.should(eq(4096))
+ end
+
+ it "should work without a space before unit" do
+ result = scope.function_to_bytes(["4k"])
+ result.should(eq(4096))
+ end
+
+ it "should work without a unit" do
+ result = scope.function_to_bytes(["5678"])
+ result.should(eq(5678))
+ end
+
+ it "should convert fractions" do
+ result = scope.function_to_bytes(["1.5 kB"])
+ result.should(eq(1536))
+ end
+
+ it "should convert scientific notation" do
+ result = scope.function_to_bytes(["1.5e2 B"])
+ result.should(eq(150))
+ end
+
+ it "should do nothing with a positive number" do
+ result = scope.function_to_bytes([5678])
+ result.should(eq(5678))
+ end
+
+ it "should should raise a ParseError if input isn't a number" do
+ lambda { scope.function_to_bytes(["foo"]) }.should( raise_error(Puppet::ParseError))
+ end
+
+ it "should should raise a ParseError if prefix is unknown" do
+ lambda { scope.function_to_bytes(["5 uB"]) }.should( raise_error(Puppet::ParseError))
+ end
+end