106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
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// All rights reserved.
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// builtin-iterator.go
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package expr
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import (
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"fmt"
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"io"
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"git.portale-stac.it/go-pkg/expr/kern"
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)
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const (
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iterParamOperator = "operator"
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iterParamVars = "vars"
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iterVarStatus = "status"
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)
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func parseRunArgs(localCtx kern.ExprContext, args map[string]any) (it kern.Iterator, op kern.Functor, err error) {
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var ok bool
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if it, ok = args[kern.ParamIterator].(kern.Iterator); !ok {
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err = fmt.Errorf("paramter %q must be an iterator, passed %v [%s]", kern.ParamIterator, args[kern.ParamIterator], kern.TypeName(args[kern.ParamIterator]))
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return
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}
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if args[iterParamOperator] != nil {
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if op, ok = args[iterParamOperator].(kern.Functor); !ok || op == nil {
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err = fmt.Errorf("paramter %q must be a function, passed %v [%s]", iterParamOperator, args[iterParamOperator], kern.TypeName(args[iterParamOperator]))
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return
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}
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}
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var vars *kern.DictType
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if vars, ok = args[iterParamVars].(*kern.DictType); !ok && args[iterParamVars] != nil {
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err = fmt.Errorf("paramter %q must be a dictionary, passed %v [%s]", iterParamVars, args[iterParamVars], kern.TypeName(args[iterParamVars]))
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return
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}
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if vars != nil {
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for key, value := range *vars {
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var varName string
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if varName, ok = key.(string); ok {
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localCtx.UnsafeSetVar(varName, value)
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}
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}
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}
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return
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}
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func runFunc(ctx kern.ExprContext, name string, args map[string]any) (result any, err error) {
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var it kern.Iterator
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var ok bool
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var op kern.Functor
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var v any
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// var usingDefaultOp = false
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var params map[string]any
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var item any
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localCtx := ctx.Clone()
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localCtx.UnsafeSetVar(iterVarStatus, nil)
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if it, op, err = parseRunArgs(localCtx, args); err != nil {
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return
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}
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for item, err = it.Next(); err == nil; item, err = it.Next() {
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if op != nil {
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params = map[string]any{kern.ParamIndex: it.Index(), kern.ParamItem: item}
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if v, err = op.InvokeNamed(localCtx, iterParamOperator, params); err != nil {
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break
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} else {
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var success bool
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if success, ok = kern.ToBool(v); !success || !ok {
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break
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}
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}
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}
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}
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if err == io.EOF {
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err = nil
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}
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if err == nil {
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if op == nil {
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ctx.UnsafeSetVar(iterVarStatus, it.Count())
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}
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result, _ = localCtx.GetVar(iterVarStatus)
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}
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return
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}
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func ImportIterFuncs(ctx kern.ExprContext) {
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ctx.RegisterFunc("run", kern.NewGolangFunctor(runFunc), kern.TypeAny, []kern.ExprFuncParam{
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NewFuncParam(kern.ParamIterator),
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NewFuncParamFlag(iterParamOperator, PfOptional),
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NewFuncParamFlag(iterParamVars, PfOptional),
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})
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}
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func init() {
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RegisterBuiltinModule("iterator", ImportIterFuncs, "Iterator helper functions")
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}
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