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#
# specifying raabro
#
# Sun Sep 20 06:11:54 JST 2015
#
require 'spec_helper'
describe Raabro do
describe '.seq' do
it "returns a tree with result == 0 in case of failure" do
i = Raabro::Input.new('tato')
t = Raabro.seq(nil, i, :to, :ta)
expect(t.to_a).to eq(
[ nil, 0, 0, 0, nil, :seq, [
[ nil, 0, 0, 0, nil, :str, [] ]
] ]
)
expect(i.offset).to eq(0)
end
it "returns a tree with result == 0 in case of failure (at 2nd step)" do
i = Raabro::Input.new('tato')
t = Raabro.seq(nil, i, :ta, :ta)
expect(
t.to_a(:leaves => true)
).to eq(
[ nil, 0, 0, 0, nil, :seq, [
[ nil, 1, 0, 2, nil, :str, 'ta' ],
[ nil, 0, 2, 0, nil, :str, [] ]
] ]
)
expect(i.offset).to eq(0)
end
it "returns a tree with result == 1 in case of success" do
i = Raabro::Input.new('tato')
t = Raabro.seq(nil, i, :ta, :to)
expect(
t.to_a(:leaves => true)
).to eq(
[ nil, 1, 0, 4, nil, :seq, [
[ nil, 1, 0, 2, nil, :str, 'ta' ],
[ nil, 1, 2, 2, nil, :str, 'to' ]
] ]
)
expect(i.offset).to eq(4)
end
it "names the result if there is a name" do
i = Raabro::Input.new('tato')
t = Raabro.seq(:x, i, :ta, :to)
expect(
t.to_a(:leaves => true)
).to eq(
[ :x, 1, 0, 4, nil, :seq, [
[ nil, 1, 0, 2, nil, :str, 'ta' ],
[ nil, 1, 2, 2, nil, :str, 'to' ]
] ]
)
expect(i.offset).to eq(4)
end
it "names in case of failure as well" do
i = Raabro::Input.new('tato')
t = Raabro.seq(:y, i, :ta, :ta)
expect(
t.to_a(:leaves => true)
).to eq(
[ :y, 0, 0, 0, nil, :seq, [
[ nil, 1, 0, 2, nil, :str, 'ta' ],
[ nil, 0, 2, 0, nil, :str, [] ]
] ]
)
expect(i.offset).to eq(0)
end
it "fails when the input string ends" do
i = Raabro::Input.new('to')
t = Raabro.seq(:z, i, :to, :ta)
expect(
t.to_a(:leaves => true)
).to eq(
[ :z, 0, 0, 0, nil, :seq, [
[ nil, 1, 0, 2, nil, :str, 'to' ],
[ nil, 0, 2, 0, nil, :str, [] ]
] ]
)
expect(i.offset).to eq(0)
end
it "accepts an empty input" do
i = Raabro::Input.new('tato', 4)
t = Raabro.seq(nil, i, :to, :ta)
expect(t.to_a).to eq(
[ nil, 0, 4, 0, nil, :seq, [
[ nil, 0, 4, 0, nil, :str, [] ]
] ]
)
expect(i.offset).to eq(4)
end
end
describe 'seq and quantifiers' do
describe 'a lonely quantifier' do
it 'raises an ArgumentError' do
i = Raabro::Input.new('tato')
expect {
t = Raabro.seq(nil, i, '?')
}.to raise_error(ArgumentError, 'lone quantifier ?')
end
end
describe 'the question mark quantifier' do
it 'lets optional elements appear in sequences (miss)' do
i = Raabro::Input.new('tato')
t = Raabro.seq(nil, i, :ta, :tu, '?', :to)
expect(t.to_a(:leaves => true)).to eq(
[ nil, 1, 0, 4, nil, :seq, [
[ nil, 1, 0, 2, nil, :str, 'ta' ],
[ nil, 0, 2, 0, nil, :str, [] ],
[ nil, 1, 2, 2, nil, :str, 'to' ]
] ]
)
expect(i.offset).to eq(4)
end
it 'lets optional elements appear in sequences (hit)' do
i = Raabro::Input.new('tatuto')
t = Raabro.seq(nil, i, :ta, :tu, '?', :to)
expect(t.to_a(:leaves => true)).to eq(
[ nil, 1, 0, 6, nil, :seq, [
[ nil, 1, 0, 2, nil, :str, 'ta' ],
[ nil, 1, 2, 2, nil, :str, 'tu' ],
[ nil, 1, 4, 2, nil, :str, 'to' ]
] ]
)
expect(i.offset).to eq(6)
end
it 'lets optional elements appear in sequences (fail)' do
i = Raabro::Input.new('tatututo')
t = Raabro.seq(nil, i, :ta, :tu, '?', :to)
expect(t.to_a(:leaves => true)).to eq(
[ nil, 0, 0, 0, nil, :seq, [
[ nil, 1, 0, 2, nil, :str, 'ta' ],
[ nil, 1, 2, 2, nil, :str, 'tu' ],
[ nil, 0, 4, 0, nil, :str, [] ]
] ]
)
expect(i.offset).to eq(0)
end
end
describe 'the star quantifier' do
it 'lets optional elements recur in sequences (hit zero)' do
i = Raabro::Input.new('tato')
t = Raabro.seq(nil, i, :ta, :tu, '*', :to)
expect(t.to_a(:leaves => true)).to eq(
[ nil, 1, 0, 4, nil, :seq, [
[ nil, 1, 0, 2, nil, :str, 'ta' ],
[ nil, 0, 2, 0, nil, :str, [] ],
[ nil, 1, 2, 2, nil, :str, 'to' ]
] ]
)
expect(i.offset).to eq(4)
end
it 'lets optional elements recur in sequences (hit)' do
i = Raabro::Input.new('tatututo')
t = Raabro.seq(nil, i, :ta, :tu, '*', :to)
expect(t.to_a(:leaves => true)).to eq(
[ nil, 1, 0, 8, nil, :seq, [
[ nil, 1, 0, 2, nil, :str, 'ta' ],
[ nil, 1, 2, 2, nil, :str, 'tu' ],
[ nil, 1, 4, 2, nil, :str, 'tu' ],
[ nil, 0, 6, 0, nil, :str, [] ],
[ nil, 1, 6, 2, nil, :str, 'to' ]
] ]
)
expect(i.offset).to eq(8)
end
it 'stops when there is no progress' do
i = Raabro::Input.new('abc')
t = Raabro.seq(nil, i, :to_star, '*');
expect(t.to_a(:leaves => true)).to eq(
[ nil, 1, 0, 0, nil, :seq, [
[ nil, 1, 0, 0, nil, :rep, [
[ nil, 0, 0, 0, nil, :str, [] ]
] ]
] ]
)
end
end
describe 'the plus quantifier' do
it 'lets elements recur in sequences (hit)' do
i = Raabro::Input.new('tatututo')
t = Raabro.seq(nil, i, :ta, :tu, '+', :to)
expect(t.to_a(:leaves => true)).to eq(
[ nil, 1, 0, 8, nil, :seq, [
[ nil, 1, 0, 2, nil, :str, 'ta' ],
[ nil, 1, 2, 2, nil, :str, 'tu' ],
[ nil, 1, 4, 2, nil, :str, 'tu' ],
[ nil, 0, 6, 0, nil, :str, [] ],
[ nil, 1, 6, 2, nil, :str, 'to' ]
] ]
)
expect(i.offset).to eq(8)
end
it 'lets elements recur in sequences (fail)' do
i = Raabro::Input.new('tato')
t = Raabro.seq(nil, i, :ta, :tu, '+', :to)
expect(t.to_a(:leaves => true)).to eq(
[ nil, 0, 0, 0, nil, :seq, [
[ nil, 1, 0, 2, nil, :str, 'ta' ],
[ nil, 0, 2, 0, nil, :str, [] ]
] ]
)
expect(i.offset).to eq(0)
end
it 'stops when there is no progress' do
i = Raabro::Input.new('abc')
t = Raabro.seq(nil, i, :to_star, '+');
expect(t.to_a(:leaves => true)).to eq(
[ nil, 1, 0, 0, nil, :seq, [
[ nil, 1, 0, 0, nil, :rep, [
[ nil, 0, 0, 0, nil, :str, [] ]
] ]
] ]
)
end
end
describe 'the exclamation mark' do
it 'throws an error when lonely' do
i = Raabro::Input.new('tato')
expect {
t = Raabro.seq(nil, i, '!')
}.to raise_error(ArgumentError, 'lone quantifier !')
end
it 'hits post' do
i = Raabro::Input.new('tatu')
t = Raabro.seq(nil, i, :ta, :ta, '!')
expect(t.to_a(leaves: true)).to eq(
[ nil, 1, 0, 2, nil, :seq, [
[ nil, 1, 0, 2, nil, :str, 'ta' ],
[ nil, 1, 2, 0, nil, :nott, [
[ nil, 0, 2, 0, nil, :str, [] ] ] ] ] ]
)
expect(i.offset).to eq(2)
end
it 'misses post' do
i = Raabro::Input.new('tata')
t = Raabro.seq(nil, i, :ta, :ta, '!')
expect(t.to_a(leaves: true)).to eq(
[ nil, 0, 0, 0, nil, :seq, [
[ nil, 1, 0, 2, nil, :str, 'ta' ],
[ nil, 0, 2, 0, nil, :nott, [
[ nil, 1, 2, 2, nil, :str, 'ta' ] ] ] ] ]
)
expect(i.offset).to eq(0)
end
it 'hits pre' do
i = Raabro::Input.new('tatu')
t = Raabro.seq(nil, i, :tu, '!', :ta, :tu)
expect(t.to_a(leaves: true)).to eq(
[ nil, 1, 0, 4, nil, :seq, [
[ nil, 1, 0, 0, nil, :nott, [
[ nil, 0, 0, 0, nil, :str, [] ] ] ],
[ nil, 1, 0, 2, nil, :str, 'ta' ],
[ nil, 1, 2, 2, nil, :str, 'tu' ] ] ]
)
expect(i.offset).to eq(4)
end
it 'misses pre' do
i = Raabro::Input.new('tutu')
t = Raabro.seq(nil, i, :tu, '!', :ta, :tu)
expect(t.to_a(leaves: true)).to eq(
[ nil, 0, 0, 0, nil, :seq, [
[ nil, 0, 0, 0, nil, :nott, [
[ nil, 1, 0, 2, nil, :str, 'tu' ] ] ] ] ]
)
expect(i.offset).to eq(0)
end
end
end
end
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