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Contents
require_relative "spec_helper"
describe 'ZScan combinators' do
it "#try restores pos" do
z = ZScan.new "hello"
return1 = z.try do
z.scan 'h'
z.scan 'e'
end
assert_equal 'e', return1
assert_equal 2, z.pos
return2 = z.try do
z.scan 'l'
z.scan 'l'
z.scan 'p' # fails
end
assert_equal nil, return2
assert_equal 2, z.pos
end
it "#zero_or_one" do
z = Zscan.new "aab"
assert_equal ['a'], z.zero_or_one{z.scan 'a'}
assert_equal 1, z.pos
z = Zscan.new 'aab'
assert_equal [], z.zero_or_one{z.scan 'b'}
assert_equal 0, z.pos
end
it "#zero_or_more" do
z = Zscan.new "aab"
assert_equal ['a', 'a'], z.zero_or_more{z.scan 'a'}
assert_equal 2, z.pos
assert_equal 'aab', z.zero_or_more('aa'){z.scan 'c'; z.scan 'b'}
z = Zscan.new 'aab'
assert_equal [], z.zero_or_more{z.scan 'b'}
assert_equal 0, z.pos
end
it "#one_or_more" do
z = Zscan.new 'aab'
assert_equal ['a', 'a'], z.one_or_more{z.scan 'a'}
assert_equal 2, z.pos
z = Zscan.new 'aab'
assert_equal nil, z.one_or_more([]){z.scan 'b'}
end
end
Version data entries
13 entries across 13 versions & 1 rubygems