org.millscript.millscript.expr
Class AssignExpr

java.lang.Object
  org.millscript.millscript.expr.Expr<AssignAction>
      org.millscript.millscript.expr.AssignExpr

All Implemented Interfaces:

ZeroResults

public final class AssignExpr
extends Expr<AssignAction>
implements ZeroResults

This class implements an assign expression. This expression will never return any results.

See Also:

AssignSyntax, ApplyUpdaterExpr, AssignAlienAction, AssignGlobalAction, AssignLocalAction

Constructor Summary

AssignExpr(NameExpr l, Expr<?> r)
Creates a new assign expression for the specified name and value expressions.

Method Summary

AssignAction	compileIt() Compiles this expression into an action.
static Expr	make(Expr l, Expr r) Returns an expression to assign the result of the right hand side expression to the result of the left hand side expression.
void	resolve(CompilerState state) Resolves any NameExpr in the tree so that they refer to the correct ident.

Methods inherited from class org.millscript.millscript.expr.Expr

arity, compile, isIntegerExpr, resolveList, setLineNumber, setOrigin, show, show

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AssignExpr

public AssignExpr(NameExpr l,
                  Expr<?> r)

Creates a new assign expression for the specified name and value expressions.

Parameters:

l - the name expression to assign to

r - the value expression to assign from, which should return a single result

Method Detail

make

public static Expr make(Expr l,
                        Expr r)

Returns an expression to assign the result of the right hand side expression to the result of the left hand side expression. This is required to handle the situation where the left hand side is a function, and we have to apply the updater for the function, rather than assign to it.

Parameters:

l - the expression to assign to, this should be an ApplyExpr or NameExpr

r - the expression to assign from

Returns:

an ApplyUpdaterExpr if the left hand side is an ApplyExpr, otherwise an AssignExpr

compileIt

public AssignAction compileIt()

Description copied from class: Expr

Compiles this expression into an action.

Specified by:

compileIt in class Expr<AssignAction>

Returns:

the Action for this expression

See Also:

Expr.compileIt()

resolve

public void resolve(CompilerState state)

Description copied from class: Expr

Resolves any NameExpr in the tree so that they refer to the correct ident. e.g. This method is responsible for ensuring that references to a function argument in the body of a function actually refer to the correct value.

Specified by:

resolve in class Expr<AssignAction>

Parameters:

state - the compiler state we are resolving in

See Also:

Expr.resolve(org.millscript.millscript.vm.CompilerState)