Aaron Maenpaa

pattern = Regexp.new(ARGV[0])
path = ARGV[1]

File.open(path, "r").each_with_index do |line, i|
    puts "#{path}:#{i + 1}\t#{line}" if line.index(pattern)
end

i = rand(10)

puts "I'm thinking of a number x ∈ [0,9]. Can you guess it?"

while true do
    print ">> "
    guess = gets.to_i

    break if guess == i
    puts "Too low." if guess < i
    puts "Too high." if guess > i
end
puts "Good job :-)"

class Template(val tmpl: String) {
    def render(context: Map[String, Object]): String = {
        return """\$(\w+)""".r.replaceAllIn(tmpl, m => {
            context.getOrElse(m.group(1), "").toString()
        })
    }
}

import org.scalatest.FlatSpec
import org.scalatest.matchers.ShouldMatchers

class TemplateSpec extends FlatSpec with ShouldMatchers {
    val EMPTY = Map[String, Object]()

    private def test(tmpl: String, expected: String, ctx: Map[String, Object] = EMPTY) {
        new Template(tmpl).render(ctx) should equal (expected)
    }

    "A template with no tokens" should "return a blank string if the given string is blank" in {
        test("", "")
    }

    it should "return a non-blank string unchanged" in {
        val identity = "hello, world"
        test(identity, identity)
    }

    "A template with one token" should "replace missing values with the empty string" in {
        test("$name", "")
    }

    it should "replace the token with value from the context" in {
        test("$name", "Aaron", Map("name" -> "Aaron"))
    }

    it should "leave the rest of the string unchanged" in {
        test("Hello $name!", "Hello Aaron!", Map("name" -> "Aaron"))
    }

    "A template with two tokens" should "replace each token its value from the context" in {
        test("Hello $name! It is a $attitude day.", "Hello Aaron! It is a wonderful day.", Map(
            "name" -> "Aaron", "attitude" -> "wonderful"
        ))
    }

    it should "replace each missing value with the empty string" in {
        test("Hello $name! It is a $attitude day.", "Hello Aaron! It is a  day.", Map(
            "name" -> "Aaron"
        ))
    }

    it should "replace adjacent tokens with their respective values" in {
        test("$me$you", "AaronJohn", Map("me" ->"Aaron", "you" -> "John"))
    }

    it should "replace every occurrance of each placeholder" in {
        test("$a-$b-$a-$b", "AAA--AAA-", Map("a" -> "AAA"))
    }
}

TemplateSpec:
A template with no tokens
- should return a blank string if the given string is blank
- should return a non-blank string unchanged

A template with one token
- should replace missing values with the empty string
- should replace the token with value from the context
- should leave the rest of the string unchanged

A template with two tokens
- should replace each token its value from the context
- should replace each missing value with the empty string
- should replace adjacent tokens with their respective values
- should replace every occurrance of each placeholder

var template = (function(){
    var grammar = parsec.grammar([
        parsec.token("placeholder", "[$]\\w+"),
        parsec.token("literal", "[^$]+")
    ]);

    with(grammar){
        root("template", placeholder.or(literal).repeated().then(eof));
    }

    return {
        render: function render(source, context){
            var handlers = {
                literal: function(node){
                    return node.v;
                },

                placeholder: function(node){
                    var key = node.v.substring(1);
                    return context[key] || "";
                },

                template: function(node){
                    return $.map(node.children, evaluate).join("");
                }
            };

            function evaluate(node){
                return handlers[node.type](node);
            }

            var root = grammar.parse(source);
            return evaluate(root);
        }
    };
})(parsec.util);

with(grammar){
    root("template", placeholder.or(literal).repeated().then(eof));
}