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require_relative '../../spec_helper'
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
@s[:wday].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+) /)
-> { @s[nil]}.should raise_error(TypeError)
end
it "raises a TypeError when a Range is as argument" do
@s.scan(/(\w+) (\w+) (\d+) /)
-> { @s[0..2]}.should raise_error(TypeError)
end
it "raises a IndexError when there's no any named capture group in the regexp" do
@s.scan(/(\w+) (\w+) (\d+) /)
-> { @s["wday"]}.should raise_error(IndexError)
-> { @s[:wday]}.should raise_error(IndexError)
end
it "raises a IndexError when given a not existing capture group name" do
@s.scan(/(?<a>\w+) (?<b>\w+) (?<c>\d+) /)
-> { @s["wday"]}.should raise_error(IndexError)
-> { @s[:wday]}.should raise_error(IndexError)
end
it "returns named capture" do
@s.scan(/(?<wday>\w+) (?<month>\w+) (?<day>\d+) /)
@s["wday"].should == "Fri"
@s["month"].should == "Jun"
@s["day"].should == "13"
@s[:wday].should == "Fri"
@s[:month].should == "Jun"
@s[:day].should == "13"
end
end
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