Add support for line comments.

examples/syntax.pork

@@ -11,6 +11,8 @@ main = { in
   multiply = { a, b in
     a * b
   }
+
+  // calculates the result
   calculateSimpleResult = calculateSimple()
   calculateComplexResult = calculateComplex()
   multiplyResult = multiply(50, 50)

src/main/kotlin/gay/pizza/pork/parse/PorkParser.kt

@@ -197,6 +197,7 @@ class PorkParser(source: PeekableSource<Token>) {
 
   private fun ignoredByParser(type: TokenType): Boolean = when (type) {
     TokenType.BlockComment -> true
+    TokenType.LineComment -> true
     TokenType.Whitespace -> true
     else -> false
   }

src/main/kotlin/gay/pizza/pork/parse/PorkTokenizer.kt

@@ -75,6 +75,20 @@ class PorkTokenizer(val source: CharSource) {
     return Token(TokenType.BlockComment, tokenStart, comment)
   }
 
+  private fun readLineComment(firstChar: Char): Token {
+    val comment = buildString {
+      append(firstChar)
+      while (true) {
+        val char = source.peek()
+        if (char == CharSource.NullChar || char == '\n') {
+          break
+        }
+        append(source.next())
+      }
+    }
+    return Token(TokenType.LineComment, tokenStart, comment)
+  }
+
   fun next(): Token {
     while (source.peek() != CharSource.NullChar) {
       tokenStart = source.currentIndex
@@ -84,6 +98,10 @@ class PorkTokenizer(val source: CharSource) {
         return readBlockComment(char)
       }
 
+      if (char == '/' && source.peek() == '/') {
+        return readLineComment(char)
+      }
+
       for (item in TokenType.SingleChars) {
         val itemChar = item.singleChar!!.char
         if (itemChar != char) {

src/main/kotlin/gay/pizza/pork/parse/TokenType.kt

@@ -27,6 +27,7 @@ enum class TokenType(vararg properties: TokenTypeProperty) {
   Else(Keyword("else")),
   Whitespace,
   BlockComment,
+  LineComment,
   EndOfFile;
 
   val promotions: List<Promotion> = properties.filterIsInstance<Promotion>()