92 lines
2.0 KiB
Go
92 lines
2.0 KiB
Go
// Copyright (c) 2024-2026 Celestino Amoroso (celestino.amoroso@gmail.com).
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// All rights reserved.
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// operator-context-value.go
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package expr
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import (
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"io"
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"git.portale-stac.it/go-pkg/expr/kern"
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"git.portale-stac.it/go-pkg/expr/scan"
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)
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//-------- context term
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func newContextTerm(tk *scan.Token) (inst *scan.Term) {
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return &scan.Term{
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Tk: *tk,
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Children: make([]*scan.Term, 0, 1),
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Position: scan.PosPrefix,
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Priority: scan.PriIncDec,
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EvalFunc: evalContextValue,
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}
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}
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func evalContextValue(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
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var childValue any
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var sourceCtx kern.ExprContext
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if len(opTerm.Children) == 0 {
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sourceCtx = ctx
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} else if opTerm.Children[0].Symbol() == scan.SymVariable && opTerm.Children[0].Source() == "global" {
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sourceCtx = ctx.GetGlobal()
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} else if childValue, err = opTerm.EvalPrefix(ctx); err == nil {
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if dc, ok := childValue.(*dataCursor); ok {
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sourceCtx = dc.ctx
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}
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} else {
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return
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}
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if sourceCtx != nil {
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v = contextToDict(sourceCtx)
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} else if childValue != nil {
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it, ok := childValue.(kern.Iterator)
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if !ok {
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it, err = NewIterator(ctx, childValue, nil)
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}
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if err == nil {
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var item any
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values := kern.NewLinkedListA()
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for item, err = it.Next(); err == nil; item, err = it.Next() {
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values.PushBack(item)
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}
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if err == io.EOF {
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err = nil
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v = values
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}
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}
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} else {
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err = opTerm.ErrIncompatiblePrefixPostfixType(childValue)
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}
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return
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}
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func contextToDict(ctx kern.ExprContext) (dict *kern.DictType) {
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// Variables
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keys := ctx.EnumVars(nil)
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vars := kern.MakeDict()
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for _, key := range keys {
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value, _ := ctx.GetVar(key)
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vars.SetItem(key, value)
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}
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// Functions
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keys = ctx.EnumFuncs(func(name string) bool { return true })
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funcs := kern.MakeDict()
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for _, key := range keys {
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funcInfo, _ := ctx.GetFuncInfo(key)
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funcs.SetItem(key, funcInfo)
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}
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dict = kern.MakeDict()
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dict.SetItem("vars", vars)
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dict.SetItem("funcs", funcs)
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return
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}
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// init
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func init() {
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scan.RegisterTermConstructor(scan.SymDoubleDollar, newContextTerm)
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}
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