feat: initial ast implementation
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Jonny
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165
src/main/wacc/ast.scala
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165
src/main/wacc/ast.scala
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package wacc
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import parsley.generic._
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// TODO - Note that I have opted for object Add extends ParserBridge2[Expr5, Expr6, Add] instead of object Add extends ParserBridge2[Expr5, Expr6, Expr5]
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// Reason: Better type safety / pattern matching ? We can change this at any time.
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// For consistency in case objects you may see I extended the parser bridge pattern with ".type"
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// Personally I am not a fan
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// TODO - Obviously layout issues, could follow Haskell interlude style
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object ast {
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// Expressions
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sealed trait Expr
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sealed trait Expr1 extends Expr
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sealed trait Expr2 extends Expr1
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sealed trait Expr3 extends Expr2
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sealed trait Expr4 extends Expr3
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sealed trait Expr5 extends Expr4
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sealed trait Expr6 extends Expr5
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case class IntLiter(v: Int) extends Expr6
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object IntLiter extends ParserBridge1[Int, IntLiter]
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case class BoolLiter(v: Boolean) extends Expr6
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object BoolLiter extends ParserBridge1[Boolean, BoolLiter]
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case class CharLiter(v: Char) extends Expr6
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object CharLiter extends ParserBridge1[Char, CharLiter]
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case class StrLiter(v: String) extends Expr6
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object StrLiter extends ParserBridge1[String, StrLiter]
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case object PairLiter extends Expr6 with ParserBridge0[PairLiter.type]
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// TODO: with LValue questionable (see LValue BNF)
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case class Ident(v: String) extends Expr6 with LValue
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object Ident extends ParserBridge1[String, Ident]
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case class ArrayElem(name: String, indices: List[Expr])
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extends Expr6
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with LValue
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object ArrayElem extends ParserBridge2[String, List[Expr], ArrayElem]
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case class UnaryOper(op: UnaryOperator, expr: Expr6) extends Expr6
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object UnaryOper extends ParserBridge2[UnaryOperator, Expr6, UnaryOper]
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// R values
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sealed trait RValue
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case class ArrayLiter(elems: List[Expr]) extends Expr6 with RValue
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object ArrayLiter extends ParserBridge1[List[Expr], ArrayLiter]
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case class NewPair(fst: Expr, snd: Expr) extends Expr6 with RValue
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object NewPair extends ParserBridge2[Expr, Expr, NewPair]
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case class Call(name: String, args: List[Expr]) extends Expr6 with RValue
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object Call extends ParserBridge2[String, List[Expr], Call]
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// Operators
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sealed trait UnaryOperator
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case object Negate extends UnaryOperator with ParserBridge0[Negate.type]
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case object Not extends UnaryOperator with ParserBridge0[Not.type]
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case object Len extends UnaryOperator with ParserBridge0[Len.type]
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case object Ord extends UnaryOperator with ParserBridge0[Ord.type]
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case object Chr extends UnaryOperator with ParserBridge0[Chr.type]
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sealed trait BinaryOperator
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case class Add(x: Expr5, y: Expr6) extends Expr5
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object Add extends ParserBridge2[Expr5, Expr6, Add]
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case class Sub(x: Expr5, y: Expr6) extends Expr5
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object Sub extends ParserBridge2[Expr5, Expr6, Sub]
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case class Mul(x: Expr6, y: Expr6) extends Expr6
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object Mul extends ParserBridge2[Expr6, Expr6, Mul]
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case class Div(x: Expr6, y: Expr6) extends Expr6
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object Div extends ParserBridge2[Expr6, Expr6, Div]
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case class Mod(x: Expr6, y: Expr6) extends Expr6
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object Mod extends ParserBridge2[Expr6, Expr6, Mod]
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case class Greater(x: Expr4, y: Expr4) extends Expr3
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object Greater extends ParserBridge2[Expr4, Expr4, Greater]
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case class GreaterEq(x: Expr4, y: Expr4) extends Expr3
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object GreaterEq extends ParserBridge2[Expr4, Expr4, GreaterEq]
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case class Less(x: Expr4, y: Expr4) extends Expr3
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object Less extends ParserBridge2[Expr4, Expr4, Less]
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case class LessEq(x: Expr4, y: Expr4) extends Expr3
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object LessEq extends ParserBridge2[Expr4, Expr4, LessEq]
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case class Eq(x: Expr4, y: Expr4) extends Expr3
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object Eq extends ParserBridge2[Expr4, Expr4, Eq]
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case class Neq(x: Expr4, y: Expr4) extends Expr3
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object Neq extends ParserBridge2[Expr4, Expr4, Neq]
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case class And(x: Expr2, y: Expr2) extends Expr2
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object And extends ParserBridge2[Expr2, Expr2, And]
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case class Or(x: Expr1, y: Expr1) extends Expr1
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object Or extends ParserBridge2[Expr1, Expr1, Or]
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// Statements
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sealed trait Stmt
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case object Skip extends Stmt with ParserBridge0[Skip.type]
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case class VarDecl(varType: Type, name: String, expr: Expr) extends Stmt
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object VarDecl extends ParserBridge3[Type, String, Expr, VarDecl]
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case class Assign(lhs: LValue, expr: Expr) extends Stmt
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object Assign extends ParserBridge2[LValue, Expr, Assign]
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case class Read(lhs: LValue) extends Stmt
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object Read extends ParserBridge1[LValue, Read]
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case class Free(expr: Expr) extends Stmt
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object Free extends ParserBridge1[Expr, Free]
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case class Return(expr: Expr) extends Stmt
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object Return extends ParserBridge1[Expr, Return]
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case class Exit(expr: Expr) extends Stmt
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object Exit extends ParserBridge1[Expr, Exit]
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case class Print(expr: Expr, newline: Boolean) extends Stmt
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object Print extends ParserBridge2[Expr, Boolean, Print]
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case class If(cond: Expr, thenStmt: Stmt, elseStmt: Stmt) extends Stmt
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object If extends ParserBridge3[Expr, Stmt, Stmt, If]
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case class While(cond: Expr, body: Stmt) extends Stmt
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object While extends ParserBridge2[Expr, Stmt, While]
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case class SeqStmt(stmt1: Stmt, stmt2: Stmt) extends Stmt
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object SeqStmt extends ParserBridge2[Stmt, Stmt, SeqStmt]
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// LValues
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sealed trait LValue
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// Pair Elements
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sealed trait PairElem extends LValue
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case class Fst(elem: LValue) extends PairElem
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object Fst extends ParserBridge1[LValue, Fst]
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case class Snd(elem: LValue) extends PairElem
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object Snd extends ParserBridge1[LValue, Snd]
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// Function Defns
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case class FuncDecl(
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returnType: Type,
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name: String,
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params: List[Param],
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body: Stmt
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)
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object FuncDecl
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extends ParserBridge4[Type, String, List[Param], Stmt, FuncDecl]
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case class Param(paramType: Type, name: String)
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object Param extends ParserBridge2[Type, String, Param]
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// waccadoodledo
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case class Program(funcs: List[FuncDecl], main: Stmt)
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object Program extends ParserBridge2[List[FuncDecl], Stmt, Program]
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// Types
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sealed trait Type
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case object IntType extends Type with ParserBridge0[IntType.type]
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case object BoolType extends Type with ParserBridge0[BoolType.type]
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case object CharType extends Type with ParserBridge0[CharType.type]
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case object StringType extends Type with ParserBridge0[StringType.type]
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case class ArrayType(elemType: Type) extends Type
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object ArrayType extends ParserBridge1[Type, ArrayType]
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case class PairType(fst: PairElemType, snd: PairElemType) extends Type
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object PairType extends ParserBridge2[PairElemType, PairElemType, PairType]
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sealed trait PairElemType
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case object PairBaseType
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extends PairElemType
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with ParserBridge0[PairBaseType.type]
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case class PairArrayType(baseType: Type) extends PairElemType
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object PairArrayType extends ParserBridge1[Type, PairArrayType]
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}
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