43 lines
1.1 KiB
Go
43 lines
1.1 KiB
Go
// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
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// All rights reserved.
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// context.go
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package expr
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// ---- Function template
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type FuncTemplate func(ctx ExprContext, name string, args []any) (result any, err error)
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// ---- Functor interface
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type Functor interface {
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Invoke(ctx ExprContext, name string, args []any) (result any, err error)
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}
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type simpleFunctor struct {
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f FuncTemplate
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}
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func (functor *simpleFunctor) Invoke(ctx ExprContext, name string, args []any) (result any, err error) {
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return functor.f(ctx, name, args)
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}
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// ---- Function Info
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type ExprFunc interface {
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Name() string
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MinArgs() int
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MaxArgs() int
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Functor() Functor
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}
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// ----Expression Context
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type ExprContext interface {
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Clone() ExprContext
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GetVar(varName string) (value any, exists bool)
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SetVar(varName string, value any)
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setVar(varName string, value any)
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EnumVars(func(name string) (accept bool)) (varNames []string)
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EnumFuncs(func(name string) (accept bool)) (funcNames []string)
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GetFuncInfo(name string) (item ExprFunc, exists bool)
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Call(name string, args []any) (result any, err error)
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RegisterFunc(name string, f Functor, minArgs, maxArgs int)
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}
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