Class: ConstantNode

• Inheritance
• Description
• Class protocol
  • instance creation
  • queries
• Instance protocol
  • RBParser compatibility
  • accessing
  • code generation
  • enumerating
  • evaluation
  • printing & storing
  • queries
  • testing
  • visiting

Inheritance:

   Object
   |
   +--ParseNode
      |
      +--PrimaryNode
         |
         +--ConstantNode
            |
            +--ECompletionConstantNode
            |
            +--JavaScriptConstantNode

Package:

stx:libcomp

Category:

System-Compiler-Support

Version:

rev: 1.57 date: 2019/08/11 12:20:02

user: cg

file: ConstantNode.st directory: libcomp

module: stx stc-classLibrary: libcomp

Author:

Claus Gittinger

Description:

node for parse-trees, representing literal constants
This is a helper class for the compiler.

Class protocol:

 type: t value: val

JV@2011-07-19: Changed not to share the nodes

usage example(s):

TrueNode := (self basicNew) type:t value:val

usage example(s):

FalseNode := (self basicNew) type:t value:val

usage example(s):

NilNode := (self basicNew) type:t value:val

usage example(s):

Const0Node := (self basicNew) type:t value:val

usage example(s):

Const1Node := (self basicNew) type:t value:val

usage example(s):

Float0Node := (self basicNew) type:t value:val

usage example(s):

^ (self basicNew) type:t value:val

 type: t value: val from: startPos to: endPos

 value: val

 typeOfConstant: anObject

return the constantNode type for an object

Instance protocol:

 token

for RB compatibility, I implement some of its protocol

 lineNumber: ignoredLineNumber

(comment from inherited method)
set linenumber - ignored here

 originalString

 originalString: aString

to remember the original string from scanning
(in case of a radix-number or a c-string)

 codeForSideEffectOn: aStream inBlock: b for: aCompiler

no code at all

 codeForSimpleReturnOn: aStream inBlock: b lineNumber: lineNrOrNil for: aCompiler

anything else must be pushed, then top returned

 codeOn: aStream inBlock: b for: aCompiler

generate code for the constant

 codeStoreOn: aStream inBlock: codeBlock valueNeeded: valueNeeded for: aCompiler

not sent - parser checks for this

 nodeDo: anEnumerator

helper for parse tree walking

 evaluate

exists for performance only

 evaluateIn: anEnvironment

 store: aValue

not reached - parser checks for this

 value

for compatibility with RB-AST

 displayOn: aGCOrStream

Compatibility
append a printed desription on some stream (Dolphin, Squeak)
OR:
display the receiver in a graphicsContext at 0@0 (ST80).
This method allows for any object to be displayed in some view
(although the fallBack is to display its printString ...)

 printOn: aStream indent: i

 canReuseAsArg: anotherNode

 withConstantValueDo: aBlock

return true, if this evaluates to a constant value
and evaluate aBlock with it

 isConstant

 isConstantNumber

(comment from inherited method)
return true, if this is a node for a constant number

 isLiteralArray

(comment from inherited method)
for compatibility with RB-AST

 isLiteralCString

(comment from inherited method)
for compatibility with RB-AST

 acceptVisitor: aVisitor

Double dispatch back to the visitor, passing my type encoded in
the selector (visitor pattern)