language: add boolean and/or operators, change negation syntax (#7)

* language: add boolean and/or operators, change negation syntax

* examples: simplify row builder using arrays

ast/src/main/ast/pork.yml

@@ -96,6 +96,12 @@ types:
     - name: LesserEqual
       values:
         token: "<="
+    - name: BooleanAnd
+      values:
+        token: "and"
+    - name: BooleanOr
+      values:
+        token: "or"
     - name: BinaryAnd
       values:
         token: "&"
@@ -196,9 +202,9 @@ types:
     - name: token
       type: String
     enums:
-    - name: Negate
+    - name: BooleanNot
       values:
-        token: "!"
+        token: "not"
     - name: UnaryPlus
       values:
         token: "+"

ast/src/main/kotlin/gay/pizza/pork/ast/InfixOperator.kt

@@ -19,6 +19,8 @@ enum class InfixOperator(val token: String) {
   Greater(">"),
   GreaterEqual(">="),
   LesserEqual("<="),
+  BooleanAnd("and"),
+  BooleanOr("or"),
   BinaryAnd("&"),
   BinaryOr("|"),
   BinaryExclusiveOr("^")

ast/src/main/kotlin/gay/pizza/pork/ast/PrefixOperator.kt

@@ -7,7 +7,7 @@ import kotlinx.serialization.Serializable
 @Serializable
 @SerialName("prefixOperator")
 enum class PrefixOperator(val token: String) {
-  Negate("!"),
+  BooleanNot("not"),
   UnaryPlus("+"),
   UnaryMinus("-"),
   BinaryNot("~")

evaluator/src/main/kotlin/gay/pizza/pork/evaluator/EvaluationVisitor.kt

@@ -92,7 +92,7 @@ class EvaluationVisitor(root: Scope) : NodeVisitor<Any> {
   override fun visitPrefixOperation(node: PrefixOperation): Any {
     val value = node.expression.visit(this)
     return when (node.op) {
-      PrefixOperator.Negate -> {
+      PrefixOperator.BooleanNot -> {
         if (value !is Boolean) {
           throw RuntimeException("Cannot negate a value which is not a boolean.")
         }
@@ -192,6 +192,14 @@ class EvaluationVisitor(root: Scope) : NodeVisitor<Any> {
       else -> {}
     }
 
+    if (left is Boolean && right is Boolean) {
+      when (node.op) {
+        InfixOperator.BooleanAnd -> return left && right
+        InfixOperator.BooleanOr -> return left || right
+        else -> {}
+      }
+    }
+
     if (left !is Number || right !is Number) {
       throw RuntimeException("Failed to evaluate infix operation, bad types.")
     }
@@ -311,7 +319,7 @@ class EvaluationVisitor(root: Scope) : NodeVisitor<Any> {
       InfixOperator.Minus -> subtract(convert(left), convert(right))
       InfixOperator.Multiply -> multiply(convert(left), convert(right))
       InfixOperator.Divide -> divide(convert(left), convert(right))
-      InfixOperator.Equals, InfixOperator.NotEquals -> throw RuntimeException("Unable to handle operation $op")
+      InfixOperator.Equals, InfixOperator.NotEquals, InfixOperator.BooleanAnd, InfixOperator.BooleanOr -> throw RuntimeException("Unable to handle operation $op")
       InfixOperator.BinaryAnd -> binaryAnd(convert(left), convert(right))
       InfixOperator.BinaryOr -> binaryOr(convert(left), convert(right))
       InfixOperator.BinaryExclusiveOr -> binaryExclusiveOr(convert(left), convert(right))
@@ -333,7 +341,7 @@ class EvaluationVisitor(root: Scope) : NodeVisitor<Any> {
     binaryNot: (T) -> T
   ): Any {
     return when (op) {
-      PrefixOperator.Negate -> throw RuntimeException("Unable to handle operation $op")
+      PrefixOperator.BooleanNot -> throw RuntimeException("Unable to handle operation $op")
       PrefixOperator.UnaryPlus -> plus(convert(value))
       PrefixOperator.UnaryMinus -> minus(convert(value))
       PrefixOperator.BinaryNot -> binaryNot(convert(value))

examples/boolean.pork

@@ -0,0 +1,30 @@
+func buildRow(str, a, b, c, d) {
+  let checkSeparator = "       "
+  print("|", str, "| ")
+  for i in [a, b, c, d] {
+    print(checkSeparator)
+    if a { print("✅|") } else { print("🚫|") }
+  }
+  println()
+}
+
+export func main() {
+  println("|          | a=🚫 b=🚫| a=✅b=🚫| a=🚫b=✅| a=✅b=✅|")
+  buildRow(" a ==  b", false == false, true == false, false == true, true == true)
+  buildRow("!a ==  b", (not false) == false, (not true) == false, (not false) == true, (not true) == true)
+  buildRow(" a == !b", false == (not false), true == (not false), false == (not true), true == (not true))
+  buildRow("!a == !b", (not false) == (not false), (not true) == (not false), (not false) == (not true), (not true) == (not true))
+  buildRow(" a !=  b", false != false, true != false, false != true, true != true)
+  buildRow("!a !=  b", (not false) != false, (not true) != false, (not false) != true, (not true) != true)
+  buildRow(" a != !b", false != (not false), true != (not false), false != (not true), true != (not true))
+  buildRow("!a != !b", (not false) != (not false), (not true) != (not false), (not false) != (not true), (not true) != (not true))
+  buildRow(" a &&  b", false and false, true and false, false and true, true and true)
+  buildRow("!a &&  b", (not false) and false, (not true) and false, (not false) and true, (not true) and true)
+  buildRow(" a && !b", false and (not false), true and (not false), false and (not true), true and (not true))
+  buildRow("!a && !b", (not false) and (not false), (not true) and (not false), (not false) and (not true), (not true) and (not true))
+  buildRow(" a ||  b", false or false, true or false, false or true, true or true)
+  buildRow("!a ||  b", (not false) or false, (not true) or false, (not false) or true, (not true) or true)
+  buildRow(" a || !b", false or (not false), true or (not false), false or (not true), true or (not true))
+  buildRow("!a || !b", (not false) or (not false), (not true) or (not false), (not false) or (not true), (not true) or (not true))
+  println("|------------------------------------------------------|")
+}

parser/src/main/kotlin/gay/pizza/pork/parser/Parser.kt

@@ -83,7 +83,7 @@ class Parser(source: PeekableSource<Token>, val attribution: NodeAttribution) {
   }
 
   private fun readPrefixOperation(): PrefixOperation = within {
-    expect(TokenType.Negation, TokenType.Plus, TokenType.Minus, TokenType.Tilde) {
+    expect(TokenType.Not, TokenType.Plus, TokenType.Minus, TokenType.Tilde) {
       PrefixOperation(convertPrefixOperator(it), readExpression())
     }
   }
@@ -157,7 +157,7 @@ class Parser(source: PeekableSource<Token>, val attribution: NodeAttribution) {
         readParentheses()
       }
 
-      TokenType.Negation, TokenType.Plus, TokenType.Minus, TokenType.Tilde -> {
+      TokenType.Not, TokenType.Plus, TokenType.Minus, TokenType.Tilde -> {
         readPrefixOperation()
       }
 
@@ -215,7 +215,9 @@ class Parser(source: PeekableSource<Token>, val attribution: NodeAttribution) {
         TokenType.Lesser,
         TokenType.Greater,
         TokenType.LesserEqual,
-        TokenType.GreaterEqual
+        TokenType.GreaterEqual,
+        TokenType.And,
+        TokenType.Or
       )
     ) {
       within {
@@ -338,10 +340,13 @@ class Parser(source: PeekableSource<Token>, val attribution: NodeAttribution) {
     TokenType.Greater -> InfixOperator.Greater
     TokenType.LesserEqual -> InfixOperator.LesserEqual
     TokenType.GreaterEqual -> InfixOperator.GreaterEqual
+    TokenType.And -> InfixOperator.BooleanAnd
+    TokenType.Or -> InfixOperator.BooleanOr
     else -> throw RuntimeException("Unknown Infix Operator")
   }
 
   private fun convertPrefixOperator(token: Token): PrefixOperator = when (token.type) {
+    TokenType.Not -> PrefixOperator.BooleanNot
     TokenType.Plus -> PrefixOperator.UnaryPlus
     TokenType.Minus -> PrefixOperator.UnaryMinus
     TokenType.Tilde -> PrefixOperator.BinaryNot

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

@@ -13,7 +13,8 @@ enum class TokenType(vararg properties: TokenTypeProperty) {
       (it in '0' .. '9')}, KeywordUpgrader),
   StringLiteral(StringLiteralFamily),
   Equality(OperatorFamily),
-  Inequality(OperatorFamily),
+  Inequality(ManyChars("!="), OperatorFamily),
+  ExclaimationPoint(SingleChar('!'), Promotion('=', Inequality)),
   Equals(SingleChar('='), Promotion('=', Equality)),
   PlusPlus(ManyChars("++"), OperatorFamily),
   MinusMinus(ManyChars("--"), OperatorFamily),
@@ -21,6 +22,8 @@ enum class TokenType(vararg properties: TokenTypeProperty) {
   Minus(SingleChar('-'), OperatorFamily, Promotion('-', MinusMinus)),
   Multiply(SingleChar('*'), OperatorFamily),
   Divide(SingleChar('/'), OperatorFamily),
+  And(ManyChars("and"), OperatorFamily),
+  Or(ManyChars("or"), OperatorFamily),
   Tilde(SingleChar('~'), OperatorFamily),
   Ampersand(SingleChar('&'), OperatorFamily),
   Pipe(SingleChar('|'), OperatorFamily),
@@ -35,7 +38,7 @@ enum class TokenType(vararg properties: TokenTypeProperty) {
   RightBracket(SingleChar(']')),
   LeftParentheses(SingleChar('(')),
   RightParentheses(SingleChar(')')),
-  Negation(SingleChar('!'), Promotion('=', Inequality), OperatorFamily),
+  Not(ManyChars("not"), OperatorFamily),
   Mod(ManyChars("mod"), OperatorFamily),
   Rem(ManyChars("rem"), OperatorFamily),
   Comma(SingleChar(',')),