ftdop3Spec.scala

/*
 * ftdrop3Spec.scala
 *
 * specs for ftdop3.scala
 * http://gist.github.com/30441
 *
 * require: specs-<version>.jar
 * http://code.google.com/p/specs/
 */
package ftdop3

import org.specs._
import org.specs.matcher._
import ftdop3.{main => FTDOP}

object ftdop3Spec extends Specification("specification of ftdop3"){

    val EVAL_ERROR = -1
    
    "ftdop3" should {

        "parse successfully." >> {
            "unsigned number" >> {
                FTDOP.parse("1") must_== 1
                FTDOP.parse("100") must_== 100
            }
            "negative numbers" >> {
                FTDOP.parse("-5") must_== -5 // must fail
                //FTDOP.parse("-5") must_== ("-",5)
            }
            "1+1" >> {
                FTDOP.parse("1+1") must_==(1,"+",1)
            }
            "1*1" >> {
                FTDOP.parse("1*1") must_==(1,"*",1)
            }
            "1+1+1" >> {
                FTDOP.parse("1+1+1") must_==((1,"+",1),"+",1)
            }
            "1+1*1" >> {
                FTDOP.parse("1+1*1") must_==(1,"+",(1,"*",1))
            }
            "if( true ) 1 else 2" >> {
                FTDOP.parse("if( 1==1 ) 1 else 9")
                    .must_== ("if",("",(1,"==",1),""),(1,"else",9))
            }
            "a=fun(c)c+1 a(2)" >> {
                FTDOP.parse("a=fun(c)c+1 a(2)")
                    .must_== (("a","=",("fun",("","c",""),("c","+",1))),"@",("a",("",2,"")))
            }
        }

        "evaluate successfully." >> {
            "unsigned numbers" >> {
                FTDOP.eval("1") must_== 1
                FTDOP.eval("100") must_== 100
            }
            "negative numbers" >> {
                FTDOP.eval("-1") must_== -1
                FTDOP.eval("-100") must_== -100
            }
            "1+1" >> {
                FTDOP.eval("1+1") must_== 2
            }
            "1*1" >> {
                FTDOP.eval("1*1") must_== 1
            }
            "1+1+1" >> {
                FTDOP.eval("1+1+1") must_== 3
            }
            "1+1*1" >> {
                FTDOP.eval("1+1*1") must_== 2
            }
            "2*(1+1)" >> {
                FTDOP.eval("2*(1+1)") must_== 4
            }
            "if( true ) 1 else 2" >> {
                FTDOP.eval("if( 1==1 ) 1 else 9") must_== 1
            }
            "a=fun(c)c+1 a(2)" >> {
                FTDOP.eval("a=fun(c)c+1 a(2)") must_== 3
            }
        }

        "not evaluate." >> {
            "too big number" >> {
                val n = "100000000000"
                try{
                    FTDOP.eval(n) must_== EVAL_ERROR
                }catch{
                    case e =>
                        e must beLike{ case ex:NumberFormatException => true }
                }
            }
            "--5" >> {
                FTDOP.eval("--5") must_== EVAL_ERROR
            }
            "1+1*" >> {
                FTDOP.eval("1+1*") must_== EVAL_ERROR
            }
        }
    }
}