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require 'spec_helper'
module SyntaxNodeSpec
describe "A new terminal syntax node" do
attr_reader :node
before do
@node = Runtime::SyntaxNode.new("input", 0...3)
end
it "reports itself as terminal" do
node.should be_terminal
node.should_not be_nonterminal
end
it "has a text value based on the input and the interval" do
node.text_value.should == "inp"
end
it "has itself as its only element" do
node.elements.should be_nil
end
end
describe "A new nonterminal syntax node" do
attr_reader :node
before do
@elements = [Runtime::SyntaxNode.new('input', 0...3)]
@node = Runtime::SyntaxNode.new('input', 0...3, @elements)
end
it "reports itself as nonterminal" do
node.should be_nonterminal
node.should_not be_terminal
end
it "has a text value based on the input and the interval" do
node.text_value.should == "inp"
end
it "has the elements with which it was instantiated" do
node.elements.should == @elements
end
it "sets itself as the parent of its elements" do
node.elements.each do |element|
element.parent.should == node
end
end
end
describe "A new nonterminal syntax node with all children lazily instantiated" do
attr_reader :node
it "should lazily instantiate its child nodes" do
@node = Runtime::SyntaxNode.new('input', 0...3, [true, true, true])
node.elements.size.should == 3
node.elements.first.interval.should == (0...1)
node.elements.first.parent.should == node
end
it "should lazily replace stand-in child nodes around real ones" do
@input = "input"
child1 = Runtime::SyntaxNode.new(@input, 1...2)
child2 = Runtime::SyntaxNode.new(@input, 3...4)
@node = Runtime::SyntaxNode.new(@input, 0...5, [true, child1, true, child2, true])
node.elements.size.should == 5
node.elements[0].interval.should == (0...1)
node.elements[0].parent.should == node
0.upto(4) do |index|
node.elements[index].text_value.should == @input[index, 1]
end
end
end
end
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