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require 'spec_helper'
module BasicGrammar
extend Temple::Mixins::GrammarDSL
Expression <<
Symbol |
Answer |
[:zero_or_more, 'Expression*'] |
[:one_or_more, 'Expression+'] |
[:zero_or_one, 'Expression?'] |
[:bool, Bool] |
nil
Bool <<
true | false
Answer <<
Value(42)
end
module ExtendedGrammar
extend BasicGrammar
Expression << [:extended, Expression]
end
describe Temple::Mixins::GrammarDSL do
it 'should support class types' do
expect(BasicGrammar).to be_match(:symbol)
expect(BasicGrammar).not_to be_match([:symbol])
expect(BasicGrammar).not_to be_match('string')
expect(BasicGrammar).not_to be_match(['string'])
end
it 'should support value types' do
expect(BasicGrammar).to be_match(42)
expect(BasicGrammar).not_to be_match(43)
end
it 'should support nesting' do
expect(BasicGrammar).to be_match([:zero_or_more, [:zero_or_more]])
end
it 'should support *' do
expect(BasicGrammar).to be_match([:zero_or_more])
expect(BasicGrammar).to be_match([:zero_or_more, nil, 42])
end
it 'should support +' do
expect(BasicGrammar).not_to be_match([:one_or_more])
expect(BasicGrammar).to be_match( [:one_or_more, 42])
expect(BasicGrammar).to be_match( [:one_or_more, 42, nil])
end
it 'should support ?' do
expect(BasicGrammar).not_to be_match([:zero_or_one, nil, 42])
expect(BasicGrammar).to be_match( [:zero_or_one])
expect(BasicGrammar).to be_match( [:zero_or_one, 42])
end
it 'should support extended grammars' do
expect(ExtendedGrammar).to be_match([:extended, [:extended, 42]])
expect(BasicGrammar).not_to be_match([:zero_or_more, [:extended, nil]])
expect(BasicGrammar).not_to be_match([:extended, [:extended, 42]])
end
it 'should have validate!' do
grammar_validate BasicGrammar,
[:zero_or_more, [:zero_or_more, [:unknown]]],
"BasicGrammar::Expression did not match\n[:unknown]\n"
grammar_validate BasicGrammar,
[:zero_or_more, [:one_or_more]],
"BasicGrammar::Expression did not match\n[:one_or_more]\n"
grammar_validate BasicGrammar,
[:zero_or_more, 123, [:unknown]],
"BasicGrammar::Expression did not match\n123\n"
grammar_validate BasicGrammar,
[:bool, 123],
"BasicGrammar::Bool did not match\n123\n"
end
end
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