poslang

type BoolExpr ¶

type BoolExpr interface {
	Expr
	EvalBool(x any) bool
	BoolExprToGo(x string) string
}

BoolExpr is a POS expression typed with bool.

type Expr ¶

type Expr interface {
	// Unparse returns the string representation of this expression.
	Unparse() string
}

Expr is an interface that represents a POS expression.

This means an untyped expression and a base interface of all typed expressions.

type IfThenElse ¶

type IfThenElse struct {
	Cond       BoolExpr
	Then, Else IntExpr
}

IfThenElse represents a "(BoolExpr ? IntExpr1 : IntExpr2)" expression.

func (i *IfThenElse) EvalInt(x any) int

func (i *IfThenElse) IntExprToGo(x string) string

func (i *IfThenElse) Unparse() string

type IntExpr ¶

type IntExpr interface {
	Expr
	EvalInt(x any) int
	IntExprToGo(x string) string
}

IntExpr is a POS expression typed with int.

type IntLiteral ¶

type IntLiteral struct {
	Value int
}

IntLiteral represents an integer literal in a POS expression.

func (i *IntLiteral) EvalInt(x any) int

func (i *IntLiteral) IntExprToGo(x string) string

func (i *IntLiteral) Unparse() string

type Len ¶

type Len struct {
	Expr StringExpr
}

Len represents a "len(StringExpr)" expression.

func (l *Len) EvalInt(x any) int

func (l *Len) IntExprToGo(x string) string

func (l *Len) Unparse() string

type NodeChoice ¶

type NodeChoice struct {
	Exprs []NodeExpr
}

NodeChoice represents a "(NodeExpr1 ?? NodeExpr2 ?? ...)" expression.

func (c *NodeChoice) EvalNode(x any) node

func (c *NodeChoice) NodeExprToGo(x string) string

func (c *NodeChoice) Unparse() string

type NodeEnd ¶

type NodeEnd struct {
	Expr NodeExpr
}

NodeEnd represents a "NodeExpr.end" expression.

func (e *NodeEnd) EvalPos(x any) token.Pos

func (e *NodeEnd) PosExprToGo(x string) string

func (e *NodeEnd) Unparse() string

type NodeExpr ¶

type NodeExpr interface {
	Expr
	EvalNode(x any) node
	NodeExprToGo(x string) string
}

NodeExpr is a POS expression typed with ast.Node.

type NodePos ¶

type NodePos struct {
	Expr NodeExpr
}

NodePos represents a "NodeExpr.pos" expression.

func (p *NodePos) EvalPos(x any) token.Pos

func (p *NodePos) PosExprToGo(x string) string

func (p *NodePos) Unparse() string

type NodeSliceExpr ¶

type NodeSliceExpr interface {
	Expr
	EvalNodeSlice(x any) []node
	NodeSliceExprToGo(x string) string
}

NodeSliceExpr is a POS expression typed with []ast.Node.

type NodeSliceIndex ¶

type NodeSliceIndex struct {
	Expr  NodeSliceExpr
	Index IntExpr
}

NodeSliceIndex represents a "NodeSliceExpr[IntExpr]" expression.

func (i *NodeSliceIndex) EvalNode(x any) node

func (i *NodeSliceIndex) NodeExprToGo(x string) string

func (i *NodeSliceIndex) Unparse() string

type NodeSliceLast ¶

type NodeSliceLast struct {
	Expr NodeSliceExpr
}

NodeSliceLast represents a "NodeSliceExpr[$]" expression.

func (l *NodeSliceLast) EvalNode(x any) node

func (l *NodeSliceLast) NodeExprToGo(x string) string

func (l *NodeSliceLast) Unparse() string

type PosAdd ¶

type PosAdd struct {
	Expr  PosExpr
	Value IntExpr
}

PosAdd represents a "PosExpr + IntExpr" expression.

func (a *PosAdd) EvalPos(x any) token.Pos

func (a *PosAdd) PosExprToGo(x string) string

func (a *PosAdd) Unparse() string

type PosChoice ¶

type PosChoice struct {
	Exprs []PosExpr
}

PosChoice represents a "PosExpr1 || PosExpr2 || ..." expression.

func (c *PosChoice) EvalPos(x any) token.Pos

func (c *PosChoice) PosExprToGo(x string) string

func (c *PosChoice) Unparse() string

type PosExpr ¶

type PosExpr interface {
	Expr
	EvalPos(x any) token.Pos
	PosExprToGo(x string) string
}

PosExpr is a POS expression typed with token.Pos.

func Parse(source string) (expr PosExpr, err error)

type StringExpr ¶

type StringExpr interface {
	Expr
	EvalString(x any) string
	StringExprToGo(x string) string
}

StringExpr is a POS expression typed with string.

type Var ¶

type Var struct {
	Name string
}

Var represents an untyped variable in a POS expression.

This type is determined by a context, i.e., on parsing.

func (v *Var) BoolExprToGo(x string) string

func (v *Var) EvalBool(x any) bool

func (v *Var) EvalNode(x any) node

func (v *Var) EvalNodeSlice(x any) []node

func (v *Var) EvalPos(x any) token.Pos

func (v *Var) EvalString(x any) string

func (v *Var) NodeExprToGo(x string) string

func (v *Var) NodeSliceExprToGo(x string) string

func (v *Var) PosExprToGo(x string) string

func (v *Var) StringExprToGo(x string) string

func (v *Var) Unparse() string