Contents

require "rly"
require "rly/parse/rule_parser"

describe Rly::RuleParser do
  it "parses a simple rule string" do
    s = 'expression : expression "+" expression
                    | expression "-" expression
                    | expression "*" expression
                    | expression "/" expression'
    p = Rly::RuleParser.new

    productions = p.parse(s)

    productions.length.should == 4
    productions[0].should == [:expression, [:expression, '+', :expression], nil]
    productions[1].should == [:expression, [:expression, '-', :expression], nil]
    productions[2].should == [:expression, [:expression, '*', :expression], nil]
    productions[3].should == [:expression, [:expression, '/', :expression], nil]
  end

  it "tokenizes the rule correctly" do
    s = 'maybe_superclasses : ":" superclasses |'
    l = Rly::RuleParser.lexer_class.new(s)

    l.next.type.should == :ID
    l.next.type.should == ':'
    l.next.type.should == :LITERAL
    l.next.type.should == :ID
    l.next.type.should == '|'
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
rly-0.2.3	spec/parse/rule_parser_spec.rb
rly-0.2.2	spec/parse/rule_parser_spec.rb