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require File.expand_path('../../../spec_helper', __FILE__)
require 'strscan'
describe "StringScanner#[]" do
before :each do
@s = StringScanner.new("Fri Jun 13 2008 22:43")
end
it "returns nil if there is no current match" do
@s[0].should be_nil
end
it "returns the n-th subgroup in the most recent match" do
@s.scan(/(\w+) (\w+) (\d+) /)
@s[0].should == "Fri Jun 13 "
@s[1].should == "Fri"
@s[2].should == "Jun"
@s[3].should == "13"
@s[-3].should == "Fri"
@s[-2].should == "Jun"
@s[-1].should == "13"
end
it "returns nil if index is outside of self" do
@s.scan(/(\w+) (\w+) (\d+) /)
@s[5].should == nil
@s[-5].should == nil
end
it "calls to_int on the given index" do
@s.scan(/(\w+) (\w+) (\d+) /)
@s[0.5].should == "Fri Jun 13 "
end
it "raises a TypeError if the given index is nil" do
@s.scan(/(\w+) (\w+) (\d+) /)
lambda { @s[nil]}.should raise_error(TypeError)
end
it "raises a TypeError when a String is as argument" do
@s.scan(/(\w+) (\w+) (\d+) /)
lambda { @s["Fri"]}.should raise_error(TypeError)
end
it "raises a TypeError when a Range is as argument" do
@s.scan(/(\w+) (\w+) (\d+) /)
lambda { @s[0..2]}.should raise_error(TypeError)
end
end
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