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require 'spec_helper'
describe "Tree output" do
extend Parslet
def self.hash_examples(h)
h.each do |atom, expected|
it "should convert #{atom} to #{expected.inspect}" do
atom.parse(input).should == expected
end
end
end
context "when parsing the empty string" do
let(:input) { '' }
hash_examples(
# No naming
str('a').maybe => '',
str('a').repeat => '',
# Named contents: maybe yields nil
str('a').maybe.as(:f) => {:f => nil},
str('a').repeat.as(:f) => {:f => []},
# Contents that aren't simple strings
(str('a') >> str('b')).maybe.as(:f) => {:f => nil},
(str('a') >> str('b')).repeat.as(:f) => {:f => []},
# The other way around: Contents would be tagged, but nil result isn't
(str('a') >> str('b')).as(:f).maybe => '',
(str('a') >> str('b')).as(:f).repeat => ''
)
end
context "when parsing 'aa'" do
let(:input) { 'aa' }
hash_examples(
# since they're not named, repetitions get merged together.
str('a').as(:a).repeat >> str('a').as(:a).repeat => [{:a=>'a'},{:a=>'a'}]
)
end
end
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