ast

package
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 Go to latest Published: Feb 15, 2023 License: Apache-2.0 Imports: 9 Imported by: 0

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Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func IsNumber 

func IsNumber(e ExpNode) bool

IsNumber returns true if the given expression node is a numerical value.

Types

type AssignStat 

type AssignStat struct {
	Location
	Dest []Var
	Src  []ExpNode
}

AssignStat represents an assignment var1, ..., varN = src1, ..., srcM.

M and N do not have to be the same

func NewAssignStat 

func NewAssignStat(dst []Var, src []ExpNode) AssignStat

NewAssignStat makes a new AssignStat.

func NewFunctionStat 

func NewFunctionStat(fName Var, method Name, fx Function) AssignStat

NewFunctionStat returns an AssgnStat, ie. "function f() ..." gets transformed to "f = function() ...". This is a shortcut, probably should make a specific node for this.

func (AssignStat) HWrite 

func (s AssignStat) HWrite(w HWriter)

HWrite prints the AST in tree form.

func (AssignStat) ProcessStat 

func (s AssignStat) ProcessStat(p StatProcessor)

ProcessStat uses the given StatProcessor to process the receiver.

type BFunctionCall 

type BFunctionCall struct {
	Location
	Target ExpNode
	Method Name
	Args   []ExpNode
}

A BFunctionCall is an expression node that represents a function call surrounded by brackets. This changes the semantics of the call in some situations (e.g. ellipsis, tail calls).

For example: 

return f(x)   -- this may return multiple values and will be subject to TCO
return (f(x)) -- this will only return one single value and will not be subject to TCO

func (BFunctionCall) HWrite 

func (f BFunctionCall) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (BFunctionCall) ProcessExp 

func (f BFunctionCall) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver.

type BinOp 

type BinOp struct {
	Location
	Left   ExpNode
	OpType ops.Op
	Right  []Operation
}

A BinOp is a expression node that represents any binary operator. The right hand side can be a list of operations of the same type (OpType). All operations of the same type have the same precedence and can be merged into a list.

func NewBinOp 

func NewBinOp(left ExpNode, op ops.Op, opTok *token.Token, right ExpNode) *BinOp

NewBinOp creates a new BinOp from the given arguments. If the left node is already a BinOp node with the same operator type, a new node based on that will be created.

func (BinOp) HWrite 

func (b BinOp) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (BinOp) ProcessExp 

func (b BinOp) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver.

type BlockStat 

type BlockStat struct {
	Location
	Stats  []Stat
	Return []ExpNode
}

A BlockStat is a statement node that represents a block of statements, optionally ending in a return statement (if Return is not a nil slice - note that a bare return is encoded as a non-nil slice of length 0).

func NewBlockStat 

func NewBlockStat(stats []Stat, rtn []ExpNode) BlockStat

NewBlockStat returns a BlockStat instance conatining the given stats and return statement.

func (BlockStat) HWrite 

func (s BlockStat) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (BlockStat) ProcessStat 

func (s BlockStat) ProcessStat(p StatProcessor)

ProcessStat uses the given StatProcessor to process the receiver.

type Bool 

type Bool struct {
	Location
	Val bool
}

Bool is an expression node representing a boolean literal.

func False 

func False(tok *token.Token) Bool

False is a false boolean literal.

func True 

func True(tok *token.Token) Bool

True is a true boolean literal.

func (Bool) HWrite 

func (b Bool) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (Bool) ProcessExp 

func (b Bool) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver.

type BreakStat 

type BreakStat struct {
	Location
}

BreakStat is a statement node representing the "break" statement.

func NewBreakStat 

func NewBreakStat(tok *token.Token) BreakStat

NewBreakStat returns a BreakStat instance (the token is needed to record the location of the statement).

func (BreakStat) HWrite 

func (s BreakStat) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (BreakStat) ProcessStat 

func (s BreakStat) ProcessStat(p StatProcessor)

ProcessStat uses the given StatProcessor to process the receiver.

type CondStat 

type CondStat struct {
	Cond ExpNode
	Body BlockStat
}

CondStat is a conditional statement, used in e.g. if statements and while / repeat until loops.

func (CondStat) HWrite 

func (s CondStat) HWrite(w HWriter)

HWrite prints a tree representation of the node.

type EmptyStat 

type EmptyStat struct {
	Location
}

EmptyStat is a statement expression containing an empty statement.

func NewEmptyStat 

func NewEmptyStat(tok *token.Token) EmptyStat

NewEmptyStat returns an EmptyStat instance (located from the given token).

func (EmptyStat) HWrite 

func (s EmptyStat) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (EmptyStat) ProcessStat 

func (s EmptyStat) ProcessStat(p StatProcessor)

ProcessStat uses the given StatProcessor to process the receiver.

type Etc 

type Etc struct {
	Location
}

Etc is the "..." expression node (ellipsis).

func NewEtc 

func NewEtc(tok *token.Token) Etc

NewEtc returns an Etc instance at the location given by the passed token.

func (Etc) HWrite 

func (e Etc) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (Etc) ProcessExp 

func (e Etc) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver.

func (Etc) ProcessTailExp 

func (e Etc) ProcessTailExp(p TailExpProcessor)

ProcessTailExp uses the given TailExpProcessor to process the reveiver.

type ExpNode 

type ExpNode interface {
	Node
	ProcessExp(ExpProcessor)
}

ExpNode is an expression

func NewNumber 

func NewNumber(id *token.Token) (ExpNode, error)

NewNumber returns an ExpNode that represents the numeric literal in the given token, or an error if it's not a valid numeric literal (the error should not happen, perhaps panic instead?).

type ExpProcessor 

type ExpProcessor interface {
	ProcessBFunctionCallExp(BFunctionCall)
	ProcessBinOpExp(BinOp)
	ProcesBoolExp(Bool)
	ProcessEtcExp(Etc)
	ProcessFunctionExp(Function)
	ProcessFunctionCallExp(FunctionCall)
	ProcessIndexExp(IndexExp)
	ProcessNameExp(Name)
	ProcessNilExp(Nil)
	ProcessIntExp(Int)
	ProcessFloatExp(Float)
	ProcessStringExp(String)
	ProcessTableConstructorExp(TableConstructor)
	ProcessUnOpExp(UnOp)
}

An ExpProcessor can process all implementations of ExpNode (i.e. expressions)

type Float 

type Float struct {
	Location
	Val float64
}

Float is an expression node representing a floating point numeric literal.

func NewFloat 

func NewFloat(x float64) Float

NewFloat returns a Float instance with the given value.

func (Float) HWrite 

func (f Float) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (Float) ProcessExp 

func (f Float) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver.

type ForInStat 

type ForInStat struct {
	Location
	Vars   []Name
	Params []ExpNode
	Body   BlockStat
}

ForInStat is a statement node representing the "for Vars in Params do Body end" statement.

func NewForInStat 

func NewForInStat(startTok, endTok *token.Token, itervars []Name, params []ExpNode, body BlockStat) *ForInStat

NewForInStat returns a ForInStat instance from the given parts.

func (ForInStat) HWrite 

func (s ForInStat) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (ForInStat) ProcessStat 

func (s ForInStat) ProcessStat(p StatProcessor)

ProcessStat uses the given StatProcessor to process the receiver.

type ForStat 

type ForStat struct {
	Location
	Var   Name
	Start ExpNode
	Stop  ExpNode
	Step  ExpNode
	Body  BlockStat
}

ForStat represents the statement node "for Var = Start, Stop, Step do Body end".

func NewForStat 

func NewForStat(startTok, endTok *token.Token, itervar Name, params []ExpNode, body BlockStat) *ForStat

NewForStat returns a ForStat from the given parts.

func (ForStat) HWrite 

func (s ForStat) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (ForStat) ProcessStat 

func (s ForStat) ProcessStat(p StatProcessor)

ProcessStat uses the given StatProcessor to process the receiver.

type Function 

type Function struct {
	Location
	ParList
	Body BlockStat
	Name string
}

A Function is an expression node representing a function definition, i.e. "function Name(ParList) do Body end". The Name is optional.

func NewFunction 

func NewFunction(startTok, endTok *token.Token, parList ParList, body BlockStat) Function

NewFunction returns a Function instance built from the given arguments.

func (Function) HWrite 

func (f Function) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (Function) ProcessExp 

func (f Function) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver.

type FunctionCall 

type FunctionCall struct {
	*BFunctionCall
}

A FunctionCall is an expression node that represents a function call.

func NewFunctionCall 

func NewFunctionCall(target ExpNode, method Name, args []ExpNode) FunctionCall

NewFunctionCall returns a FunctionCall instance representing the call of <target> with <args>. The <method> arg should be non-nil if the call syntax included ":", e.g. stack:pop().

func (FunctionCall) InBrackets 

func (f FunctionCall) InBrackets() *BFunctionCall

InBrackets turns the receiver into a BFunctionCall.

func (FunctionCall) ProcessExp 

func (f FunctionCall) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver.

func (FunctionCall) ProcessStat 

func (f FunctionCall) ProcessStat(p StatProcessor)

ProcessStat uses the given StatProcessor to process the receiver.

func (FunctionCall) ProcessTailExp 

func (f FunctionCall) ProcessTailExp(p TailExpProcessor)

ProcessTailExp uses the give TailExpProcessor to process the receiver.

type GotoStat 

type GotoStat struct {
	Location
	Label Name
}

GotoStat is a statement node representing a goto statement.

func NewGotoStat 

func NewGotoStat(gotoTok *token.Token, lbl Name) GotoStat

NewGotoStat returns a GotoStat instance with the given label.

func (GotoStat) HWrite 

func (s GotoStat) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (GotoStat) ProcessStat 

func (s GotoStat) ProcessStat(p StatProcessor)

ProcessStat uses the given StatProcessor to process the receiver.

type HWriter 

type HWriter interface {
	Writef(string, ...interface{})
	Indent()
	Dedent()
	Next()
}

HWriter is an interface for printing nodes

type IfStat 

type IfStat struct {
	Location
	If      CondStat
	ElseIfs []CondStat
	Else    *BlockStat
}

IfStat is a statement node representing an "if ... [elseif] ... [else] ... end" statement, where the else clause is optional and there can be 0 or more elseif clauses.

func NewIfStat 

func NewIfStat(ifTok *token.Token, cond ExpNode, body BlockStat) IfStat

NewIfStat returns an IfStat with the given condition and then clause.

func (IfStat) AddElseIf 

func (s IfStat) AddElseIf(cond ExpNode, body BlockStat) IfStat

AddElseIf returns an IfStat based on the receiver but adding an extra elseif clause.

func (IfStat) HWrite 

func (s IfStat) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (IfStat) ProcessStat 

func (s IfStat) ProcessStat(p StatProcessor)

ProcessStat uses the given StatProcessor to process the receiver.

func (IfStat) WithElse 

func (s IfStat) WithElse(endTok *token.Token, body BlockStat) IfStat

WithElse returns an IfStat based on the receiver but with the given else clause.

type IndentWriter 

type IndentWriter struct {
	// contains filtered or unexported fields
}

IndentWriter is an implementation of HWriter that writes AST with indentation to show the tree structure.

func NewIndentWriter 

func NewIndentWriter(w io.Writer) *IndentWriter

NewIndentWriter returns a new pointer to IndentWriter that will write using the given io.Writer.

func (*IndentWriter) Dedent 

func (w *IndentWriter) Dedent()

Dedent decrements the current indentation by one level.

func (*IndentWriter) Indent 

func (w *IndentWriter) Indent()

Indent increments the current indentation by one level.

func (*IndentWriter) Next 

func (w *IndentWriter) Next()

Next moves on to the next line and adds the necessary indentation.

func (*IndentWriter) Writef 

func (w *IndentWriter) Writef(f string, args ...interface{})

Writef is like Printf.

type IndexExp 

type IndexExp struct {
	Location
	Coll ExpNode
	Idx  ExpNode
}

An IndexExp is an expression node representing indexing, i.e. "Coll[Index]".

func NewIndexExp 

func NewIndexExp(coll ExpNode, idx ExpNode) IndexExp

NewIndexExp returns an IndexExp instance for the given collection and index.

func (IndexExp) FunctionName 

func (e IndexExp) FunctionName() string

FunctionName returns the function name associated with this expression (i.e. if it is part of a function definition statement), or an empty string if there is no sensible name.

func (IndexExp) HWrite 

func (e IndexExp) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (IndexExp) ProcessExp 

func (e IndexExp) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver.

func (IndexExp) ProcessVar 

func (e IndexExp) ProcessVar(p VarProcessor)

ProcessVar uses the given VarProcessor to process the receiver.

type Int 

type Int struct {
	Location
	Val uint64
}

Int is an expression node representing a non-negative integer literal.

func NewInt 

func NewInt(val uint64) Int

NewInt returns an Int instance with the given value.

func (Int) HWrite 

func (n Int) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (Int) ProcessExp 

func (n Int) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver.

type LabelStat 

type LabelStat struct {
	Location
	Name
}

LabelStat is a statement node that represents a label.

func NewLabelStat 

func NewLabelStat(label Name) LabelStat

NewLabelStat returns a LabelStat instance for the given label.

func (LabelStat) HWrite 

func (s LabelStat) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (LabelStat) ProcessStat 

func (s LabelStat) ProcessStat(p StatProcessor)

ProcessStat uses the given StatProcessor to process the receiver.

type LocalAttrib 

type LocalAttrib uint8

LocalAttrib is the type of a local name attrib 

const (
	NoAttrib    LocalAttrib = iota
	ConstAttrib             // <const>, introduced in Lua 5.4
	CloseAttrib             // <close>, introduced in Lua 5.4
)

Valid values for LocalAttrib

type LocalFunctionStat 

type LocalFunctionStat struct {
	Location
	Function
	Name Name
}

LocalFunctionStat is a statement node that represents a local function definition, i.e. "local function Name() ...".

func NewLocalFunctionStat 

func NewLocalFunctionStat(name Name, fx Function) LocalFunctionStat

NewLocalFunctionStat returns a LocalFunctionStat instance for the given name and function definition.

func (LocalFunctionStat) HWrite 

func (s LocalFunctionStat) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (LocalFunctionStat) ProcessStat 

func (s LocalFunctionStat) ProcessStat(p StatProcessor)

ProcessStat uses the given StatProcessor to process the receiver.

type LocalStat 

type LocalStat struct {
	Location
	NameAttribs []NameAttrib
	Values      []ExpNode
}

LocalStat is a statement node representing the declaration / definition of a list of local variables.

func NewLocalStat 

func NewLocalStat(nameAttribs []NameAttrib, values []ExpNode) LocalStat

NewLocalStat returns a LocalStat instance defining the given names with the given values.

func (LocalStat) HWrite 

func (s LocalStat) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (LocalStat) ProcessStat 

func (s LocalStat) ProcessStat(p StatProcessor)

ProcessStat uses the given StatProcessor to process the receiver.

type Location 

type Location struct {
	// contains filtered or unexported fields
}

A Location is a span between two token in the source code.

func LocFromToken 

func LocFromToken(tok *token.Token) Location

LocFromToken returns a location that starts and ends at the token's position.

func LocFromTokens 

func LocFromTokens(t1, t2 *token.Token) Location

LocFromTokens returns a location that starts at t1 and ends at t2 (t1 and t2 may be nil).

func MergeLocations 

func MergeLocations(l1, l2 Locator) Location

MergeLocations takes two locators and merges them into one Location, starting at the earliest start and ending at the latest end.

func (Location) EndPos 

func (l Location) EndPos() *token.Pos

EndPos returns the end position of the location.

func (Location) Locate 

func (l Location) Locate() Location

Locate returns the receiver.

func (Location) StartPos 

func (l Location) StartPos() *token.Pos

StartPos returns the start position of the location.

type Locator 

type Locator interface {
	Locate() Location
}

Locator can provide a location in code. All AST nodes are locators.

type Name 

type Name struct {
	Location
	Val string
}

Name is an expression token representing a name (identifier).

func NewName 

func NewName(id *token.Token) Name

NewName returns a Name instance with value taken from the given token.

func (Name) AstString 

func (n Name) AstString() String

AstString returns a String with the same value and location as the receiver.

func (Name) FunctionName 

func (n Name) FunctionName() string

FunctionName returns the string associated with the name.

func (Name) HWrite 

func (n Name) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (Name) ProcessExp 

func (n Name) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver.

func (Name) ProcessVar 

func (n Name) ProcessVar(p VarProcessor)

ProcessVar process the receiver using the given VarProcessor.

type NameAttrib 

type NameAttrib struct {
	Location
	Name   Name
	Attrib LocalAttrib
}

A NameAttrib is a name introduce by a local definition, together with an optional attribute (in Lua 5.4 that is 'close' or 'const').

func NewNameAttrib 

func NewNameAttrib(name Name, attribName *Name, attrib LocalAttrib) NameAttrib

NewNameAttrib returns a new NameAttribe for the given name and attrib.

type Nil 

type Nil struct {
	Location
}

Nil is an expression node representing "nil".

func NewNil 

func NewNil(tok *token.Token) Nil

NewNil returns a Nil instance located where the given token is.

func (Nil) HWrite 

func (n Nil) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (Nil) ProcessExp 

func (n Nil) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver.

type NoTableKey 

type NoTableKey struct {
	Location
}

NoTableKey is a special expression node that can only be used as the Key of a TableField, meaning a field with no key.

func (NoTableKey) HWrite 

func (k NoTableKey) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (NoTableKey) ProcessExp 

func (k NoTableKey) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver. It panics as this type is a placeholder that should not be processed as an expression.

type Node 

type Node interface {
	Locator
	HWrite(w HWriter)
}

Node is a node in the AST

type Operation 

type Operation struct {
	Op      ops.Op
	Operand ExpNode
}

An Operation is a pair (operator, operand) which can be applied to an expression node (e.g. "+ 2" or "/ 5").

type ParList 

type ParList struct {
	Params  []Name
	HasDots bool
}

A ParList represents a function parameter list (it is not a node).

func NewParList 

func NewParList(params []Name, hasDots bool) ParList

NewParList returns ParList instance for the given parameters.

type RepeatStat 

type RepeatStat struct {
	Location
	CondStat
}

RepeatStat ia a statement expression that represents a repeat / until statement.

func NewRepeatStat 

func NewRepeatStat(repTok *token.Token, body BlockStat, cond ExpNode) RepeatStat

NewRepeatStat returns a RepeatStat instance representing the statement "repeat <body> until <cond>".

func (RepeatStat) HWrite 

func (s RepeatStat) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (RepeatStat) ProcessStat 

func (s RepeatStat) ProcessStat(p StatProcessor)

ProcessStat uses the given StatProcessor to process the receiver.

type Stat 

type Stat interface {
	Node
	ProcessStat(StatProcessor)
}

Stat is a statement

type StatProcessor 

type StatProcessor interface {
	ProcessAssignStat(AssignStat)
	ProcessBlockStat(BlockStat)
	ProcessBreakStat(BreakStat)
	ProcessEmptyStat(EmptyStat)
	ProcessForInStat(ForInStat)
	ProcessForStat(ForStat)
	ProcessFunctionCallStat(FunctionCall)
	ProcessGotoStat(GotoStat)
	ProcessIfStat(IfStat)
	ProcessLabelStat(LabelStat)
	ProcessLocalFunctionStat(LocalFunctionStat)
	ProcessLocalStat(LocalStat)
	ProcessRepeatStat(RepeatStat)
	ProcessWhileStat(WhileStat)
}

A StatProcessor can process all implementations of Stat (i.e. statements).

type String 

type String struct {
	Location
	Val []byte
}

String is a string literal.

func NewLongString 

func NewLongString(id *token.Token) String

NewLongString returns a String computed from a token containing a Lua long string.

func NewString 

func NewString(id *token.Token) (ss String, err error)

NewString returns a String from a token containing a Lua short string literal, or an error if it couln't (although perhaps it should panic instead? Parsing should ensure well-formed string token).

func (String) HWrite 

func (s String) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (String) ProcessExp 

func (s String) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver.

type TableConstructor 

type TableConstructor struct {
	Location
	Fields []TableField
}

A TableConstructor is an expression node representing a table literal, e.g. 

{ "hello", 4.5, x = 2, [z] = true }

func NewTableConstructor 

func NewTableConstructor(opTok, clTok *token.Token, fields []TableField) TableConstructor

NewTableConstructor returns a TableConstructor instance with the given fields.

func (TableConstructor) HWrite 

func (c TableConstructor) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (TableConstructor) ProcessExp 

func (c TableConstructor) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver.

type TableField 

type TableField struct {
	Location
	Key   ExpNode
	Value ExpNode
}

A TableField is a (key, value ) pair of expression nodes representing a field in a table literal. There is a special key type called "NoTableKey" for fields that do not have a key.

func NewTableField 

func NewTableField(key ExpNode, value ExpNode) TableField

type TailExpNode 

type TailExpNode interface {
	Node
	ProcessTailExp(TailExpProcessor)
}

TailExpNode is an expression which can be the tail of an exp list

type TailExpProcessor 

type TailExpProcessor interface {
	ProcessEtcTailExp(Etc)
	ProcessFunctionCallTailExp(FunctionCall)
}

A TailExpProcessor can process all implementations fo TailExpNode.

type UnOp 

type UnOp struct {
	Location
	Op      ops.Op
	Operand ExpNode
}

An UnOp is an expression node representing the application of a unary operation on an expression.

func NewUnOp 

func NewUnOp(opTok *token.Token, op ops.Op, exp ExpNode) *UnOp

NewUnOp returns a UnOp instance from the given operator an expression.

func (UnOp) HWrite 

func (u UnOp) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (UnOp) ProcessExp 

func (u UnOp) ProcessExp(p ExpProcessor)

ProcessExp uses the given ExpProcessor to process the receiver.

type Var 

type Var interface {
	ExpNode
	FunctionName() string
	ProcessVar(VarProcessor)
}

Var is an l-value, i.e. it can be assigned to.

type VarProcessor 

type VarProcessor interface {
	ProcessIndexExpVar(IndexExp)
	ProcessNameVar(Name)
}

A VarProcessor can process all types of l-values.

type WhileStat 

type WhileStat struct {
	Location
	CondStat
}

WhileStat represents a while / end statement

func NewWhileStat 

func NewWhileStat(whileTok, endTok *token.Token, cond ExpNode, body BlockStat) WhileStat

NewWhileStat returns a WhileStat instance representing the statement "while <cond> do <body> done".

func (WhileStat) HWrite 

func (s WhileStat) HWrite(w HWriter)

HWrite prints a tree representation of the node.

func (WhileStat) ProcessStat 

func (s WhileStat) ProcessStat(p StatProcessor)

ProcessStat uses the given StatProcessor to process the receiver.

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