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require File.expand_path('../../../spec_helper', __FILE__)
require 'strscan'
describe "StringScanner#scan" do
before :each do
@s = StringScanner.new("This is a test")
end
it "returns the matched string" do
@s.scan(/\w+/).should == "This"
@s.scan(/.../).should == " is"
@s.scan(//).should == ""
@s.scan(/\s+/).should == " "
end
it "treats ^ as matching from the beginning of the current position" do
@s.scan(/\w+/).should == "This"
@s.scan(/^\d/).should be_nil
@s.scan(/^\s/).should == " "
end
it "returns nil if there's no match" do
@s.scan(/\d/).should == nil
end
it "returns nil when there is no more to scan" do
@s.scan(/[\w\s]+/).should == "This is a test"
@s.scan(/\w+/).should be_nil
end
it "returns an empty string when the pattern matches empty" do
@s.scan(/.*/).should == "This is a test"
@s.scan(/.*/).should == ""
@s.scan(/./).should be_nil
end
it "raises a TypeError if pattern isn't a Regexp" do
lambda { @s.scan("aoeu") }.should raise_error(TypeError)
lambda { @s.scan(5) }.should raise_error(TypeError)
lambda { @s.scan(:test) }.should raise_error(TypeError)
lambda { @s.scan(mock('x')) }.should raise_error(TypeError)
end
end
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