83 lines
1.8 KiB
Go
83 lines
1.8 KiB
Go
// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
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// All rights reserved.
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// simple-func-store.go
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package expr
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import "fmt"
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type SimpleFuncStore struct {
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SimpleVarStore
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funcStore map[string]*funcInfo
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}
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type funcInfo struct {
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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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func (info *funcInfo) Name() string {
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return info.name
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}
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func (info *funcInfo) MinArgs() int {
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return info.minArgs
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}
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func (info *funcInfo) MaxArgs() int {
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return info.maxArgs
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}
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func (info *funcInfo) Functor() Functor {
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return info.functor
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}
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func NewSimpleFuncStore() *SimpleFuncStore {
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return &SimpleFuncStore{
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SimpleVarStore: SimpleVarStore{varStore: make(map[string]any)},
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funcStore: make(map[string]*funcInfo),
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}
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}
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func (ctx *SimpleFuncStore) Clone() ExprContext {
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return &SimpleFuncStore{
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SimpleVarStore: SimpleVarStore{varStore: CloneMap(ctx.varStore)},
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funcStore: CloneMap(ctx.funcStore),
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}
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}
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func (ctx *SimpleFuncStore) GetFuncInfo(name string) (info ExprFunc) {
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info, _ = ctx.funcStore[name]
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return
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}
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func (ctx *SimpleFuncStore) RegisterFunc(name string, functor Functor, minArgs, maxArgs int) {
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ctx.funcStore[name] = &funcInfo{name: name, minArgs: minArgs, maxArgs: maxArgs, functor: functor}
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}
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func (ctx *SimpleFuncStore) EnumFuncs(acceptor func(name string) (accept bool)) (funcNames []string) {
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funcNames = make([]string, 0)
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for name := range ctx.funcStore {
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if acceptor != nil {
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if acceptor(name) {
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funcNames = append(funcNames, name)
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}
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} else {
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funcNames = append(funcNames, name)
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}
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}
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return
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}
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func (ctx *SimpleFuncStore) Call(name string, args []any) (result any, err error) {
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if info, exists := ctx.funcStore[name]; exists {
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functor := info.functor
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result, err = functor.Invoke(ctx, name, args)
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} else {
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err = fmt.Errorf("unknown function %s()", name)
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}
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return
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}
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