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require_relative '../../spec_helper'
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 "treats ^ as matching from the beginning of the current position when it's not the first character in the regexp" do
@s.scan(/\w+/).should == "This"
@s.scan(/( is not|^ is a)/).should == " is a"
end
it "treats \\A as matching from the beginning of the current position" do
@s.scan(/\w+/).should == "This"
@s.scan(/\A\d/).should be_nil
@s.scan(/\A\s/).should == " "
end
it "treats \\A as matching from the beginning of the current position when it's not the first character in the regexp" do
@s.scan(/\w+/).should == "This"
@s.scan(/( is not|\A is a)/).should == " is a"
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
ruby_version_is ""..."2.7" do
it "raises a TypeError if pattern is a String" do
-> { @s.scan("aoeu") }.should raise_error(TypeError)
end
end
ruby_version_is "2.7" do
it "treats String as the pattern itself" do
@s.scan("this").should be_nil
@s.scan("This").should == "This"
end
end
it "raises a TypeError if pattern isn't a Regexp nor String" do
-> { @s.scan(5) }.should raise_error(TypeError)
-> { @s.scan(:test) }.should raise_error(TypeError)
-> { @s.scan(mock('x')) }.should raise_error(TypeError)
end
end
describe "StringScanner#scan with fixed_anchor: true" do
before :each do
@s = StringScanner.new("This\nis\na\ntest", fixed_anchor: true)
end
ruby_version_is "2.7" do
it "returns the matched string" do
@s.scan(/\w+/).should == "This"
@s.scan(/.../m).should == "\nis"
@s.scan(//).should == ""
@s.scan(/\s+/).should == "\n"
end
it "treats ^ as matching from the beginning of line" do
@s.scan(/\w+\n/).should == "This\n"
@s.scan(/^\w/).should == "i"
@s.scan(/^\w/).should be_nil
end
it "treats \\A as matching from the beginning of string" do
@s.scan(/\A\w/).should == "T"
@s.scan(/\A\w/).should be_nil
end
end
end
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