! Copyright (C) 2007 Chris Double.
! See http://factorcode.org/license.txt for BSD license.
!
USING: kernel tools.test peg peg.ebnf ;
IN: temporary

{ T{ ebnf-non-terminal f "abc" } } [
  "abc" 'non-terminal' parse parse-result-ast 
] unit-test

{ T{ ebnf-terminal f "55" } } [
  "'55'" 'terminal' parse parse-result-ast 
] unit-test

{
  T{ ebnf-rule f 
     "digit"
     V{ 
       T{ ebnf-choice f
          V{ T{ ebnf-terminal f "1" } T{ ebnf-terminal f "2" } }
       }
       f
     }
  } 
} [
  "digit = '1' | '2'" 'rule' parse parse-result-ast
] unit-test

{
  T{ ebnf-rule f 
     "digit" 
     V{
       T{ ebnf-sequence f
          V{ T{ ebnf-terminal f "1" } T{ ebnf-terminal f "2" } }
       }
       f
     }
  }   
} [
  "digit = '1' '2'" 'rule' parse parse-result-ast
] unit-test

{
  T{ ebnf-choice f
     V{ 
       T{ ebnf-sequence f
          V{ T{ ebnf-non-terminal f "one" } T{ ebnf-non-terminal f "two" } }
       }
       T{ ebnf-non-terminal f "three" }
     }
  } 
} [
  "one two | three" 'choice' parse parse-result-ast
] unit-test

{
  T{ ebnf-sequence f
     V{ 
       T{ ebnf-non-terminal f "one" }
       T{ ebnf-choice f
          V{ T{ ebnf-non-terminal f "two" } T{ ebnf-non-terminal f "three" } }
       }
     }
  } 
} [
  "one (two | three)" 'choice' parse parse-result-ast
] unit-test

{
  T{ ebnf-sequence f
     V{ 
       T{ ebnf-non-terminal f "one" }
       T{ ebnf-repeat0 f
          T{ ebnf-sequence f
             V{
                T{ ebnf-choice f
                   V{ T{ ebnf-non-terminal f "two" } T{ ebnf-non-terminal f "three" } }
                }
                T{ ebnf-non-terminal f "four" }
             }
          }
        }
     }
  } 
} [
  "one {(two | three) four}" 'choice' parse parse-result-ast
] unit-test

{
  T{ ebnf-sequence f
     V{ 
         T{ ebnf-non-terminal f "one" } 
         T{ ebnf-optional f T{ ebnf-non-terminal f "two" } }
         T{ ebnf-non-terminal f "three" }
     }
  } 
} [
  "one [ two ] three" 'choice' parse parse-result-ast
] unit-test