Unfinished solution to the dictionary replacer kata (http://codingdojo.org/cgi-bin/wiki.pl?back=KataDictionaryReplacer) from the 10 April 2013 coding dojo at the University of Minnesota, Morris. We got a number of good tests written and can pass everything that just has a single tagged term, but time ran out before we got to dealing with the mor…

DictionaryReplacer.groovy

class DictionaryReplacer {
	def replace(string, dictionary){
		def returnValue
		if (string.size() < 2){
			returnValue = string
		}
		else if (string[0]!='$'){
			def firstDollar = string.indexOf('$')
			if (firstDollar == -1) {
				returnValue = string
			}
			else {
				def preString = string[0..firstDollar-1]
				returnValue = preString + replace(string[firstDollar..-1], dictionary)
			}
		}
		else{
			returnValue = doReplacement(string, dictionary)
		}
		return returnValue
	}


	def doReplacement(string, dictionary) {
		def secondDollar = string.indexOf('$', 1)
		def replacedTerm = dictionary[string[1..secondDollar-1]]
		def needsReplacing = secondDollar!=-1 && replacedTerm
		def returnValue = ""
		if (needsReplacing) {
			if (secondDollar == string.size()-1) {
				returnValue=replacedTerm
			} else {
				returnValue = replacedTerm + replace(string[secondDollar+1..-1], dictionary)
			}
		} else {
			returnValue = string
		}
		return returnValue
	}
}

TestDictionaryReplacer.groovy

import spock.lang.Specification


class TestDictionaryReplacer extends Specification {
	def "test empty string"(){
		given:
		def dictionaryReplacer = new DictionaryReplacer()
		def stringInput = ""
		def dictionary = [:]
		when:
		def result = dictionaryReplacer.replace(stringInput, dictionary)
		then:
		result == ""
		
		
	}
	def "test non-empty string with an empty dictionary"(){
		given:
		def dictionaryReplacer = new DictionaryReplacer()
		def stringInput = "some string"
		def dictionary = [:]
		
		when:
		def result = dictionaryReplacer.replace(stringInput, dictionary)
		
		then:
		result == "some string"
	}
	
	def "test one-word string with non-empty dictionary"() {
		given:
		def dictionaryReplacer = new DictionaryReplacer()
		def stringInput = '$word$'
		def dictionary = ['word' : "Up"]
			
		when:
		def result = dictionaryReplacer.replace(stringInput, dictionary)
			
		then:
		result == "Up"
	}
	
	def "test one-word string with new non-empty dictionary"() {
		given:
		def dictionaryReplacer = new DictionaryReplacer()
		def stringInput = '$word$'
		def dictionary = ['word' : "Down"]
			
		when:
		def result = dictionaryReplacer.replace(stringInput, dictionary)
			
		then:
		result == "Down"
	}
	
	def "test one-word string with newer non-empty dictionary"(){
		given:
		def dictionaryReplacer = new DictionaryReplacer()
		def stringInput = '$phrase$'
		def dictionary = ['phrase' : "Down"]
			
		when:
		def result = dictionaryReplacer.replace(stringInput, dictionary)
			
		then:
		result == "Down"
	}
	
	def "test one-word string with non-empty dictionary and no match"(){
		given:
		def dictionaryReplacer = new DictionaryReplacer()
		def stringInput = '$phrase$'
		def dictionary = ['blip' : "Down"]
			
		when:
		def result = dictionaryReplacer.replace(stringInput, dictionary)
			
		then:
		result == '$phrase$'
	}
	
	def "test string with letter in front"(){
		given:
		def dictionaryReplacer = new DictionaryReplacer()
		def stringInput = 'd$phrase$'
		def dictionary = ['phrase' : "Down"]
			
		when:
		def result = dictionaryReplacer.replace(stringInput, dictionary)
			
		then:
		result == "dDown"
	}
	def "test string without ending \$"(){
		given:
		def dictionaryReplacer = new DictionaryReplacer()
		def stringInput = 'd$phrase'
		def dictionary = ['phrase' : "Down"]
			
		when:
		def result = dictionaryReplacer.replace(stringInput, dictionary)
			
		then:
		result == "d\$phrase"
	}
	def "test string without ending dollar sign"(){
		given:
		def dictionaryReplacer = new DictionaryReplacer()
		def stringInput = 'd$phrase'
		def dictionary = ['phras' : "Down"]
			
		when:
		def result = dictionaryReplacer.replace(stringInput, dictionary)
			
		then:
		result == "d\$phrase"
	}
	
	def "test string with beginning and ending character"(){
		given:
		def dictionaryReplacer = new DictionaryReplacer()
		def stringInput = 'd$phrase$d'
		def dictionary = ['phrase' : "Down"]
			
		when:
		def result = dictionaryReplacer.replace(stringInput, dictionary)
			
		then:
		result == "dDownd"
	}
	
	def "test non-empty string with a non-empty dictionary"() {
		given:
		def dictionaryReplacer = new DictionaryReplacer()
		def stringInput = 'Hello, $name$ you are looking $adjective$.'
		def dictionary = [name : "Brian", adjective : "sleepy"]
	}
	
	def "test string with three dollar signs"(){
		given:
		def dictionaryReplacer = new DictionaryReplacer()
		def stringInput = 'd$phrase$more stuff$'
		def dictionary = ['phrase' : "Down"]
			
		when:
		def result = dictionaryReplacer.replace(stringInput, dictionary)
			
		then:
		result == 'dDownmore stuff$'
	}
	
	def "test string with three dollar signs and text at end"(){
		given:
		def dictionaryReplacer = new DictionaryReplacer()
		def stringInput = 'd$phrase$ and then some $stuff and then some'
		def dictionary = ['phrase' : "Down"]
			
		when:
		def result = dictionaryReplacer.replace(stringInput, dictionary)
			
		then:
		result == 'dDown and then some $stuff and then some'
	}
}