97 lines
2.4 KiB
Go
97 lines
2.4 KiB
Go
// Copyright (c) 2024-2026 Celestino Amoroso (celestino.amoroso@gmail.com).
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// All rights reserved.
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// operator-post-inc-dec.go
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package expr
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import (
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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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// -------- post increment term
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func newPostIncTerm(tk *scan.Token) *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.PosPostfix,
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Priority: scan.PriIncDec,
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EvalFunc: evalPostInc,
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}
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}
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func evalPostInc(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
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var childValue any
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if childValue, err = opTerm.EvalPrefix(ctx); err != nil {
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return
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}
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if it, ok := childValue.(kern.Iterator); ok {
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var namePrefix string
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v, err = it.Next()
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if opTerm.Children[0].Symbol() == scan.SymVariable {
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namePrefix = opTerm.Children[0].Source()
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}
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ctx.UnsafeSetVar(namePrefix+"_index", it.Index())
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if c, err1 := it.Current(); err1 == nil {
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ctx.UnsafeSetVar(namePrefix+"_current", c)
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}
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if it.HasOperation(kern.KeyName) {
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if k, err1 := it.CallOperation(kern.KeyName, nil); err1 == nil {
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ctx.UnsafeSetVar(namePrefix+"_key", k)
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}
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}
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if it.HasOperation(kern.ValueName) {
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if v1, err1 := it.CallOperation(kern.ValueName, nil); err1 == nil {
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ctx.UnsafeSetVar(namePrefix+"_value", v1)
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}
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}
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} else if kern.IsInteger(childValue) && opTerm.Children[0].Symbol() == scan.SymVariable {
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v = childValue
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i, _ := childValue.(int64)
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ctx.SetVar(opTerm.Children[0].Source(), i+1)
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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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// -------- post decrement term
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func newPostDecTerm(tk *scan.Token) *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.PosPostfix,
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Priority: scan.PriIncDec,
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EvalFunc: evalPostDec,
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}
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}
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func evalPostDec(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
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var childValue any
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if childValue, err = opTerm.EvalPrefix(ctx); err != nil {
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return
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}
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/* if it, ok := childValue.(Iterator); ok {
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v, err = it.Next()
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} else */if kern.IsInteger(childValue) && opTerm.Children[0].Symbol() == scan.SymVariable {
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v = childValue
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i, _ := childValue.(int64)
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ctx.SetVar(opTerm.Children[0].Source(), i-1)
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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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// init
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func init() {
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scan.RegisterTermConstructor(scan.SymDoublePlus, newPostIncTerm)
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scan.RegisterTermConstructor(scan.SymDoubleMinus, newPostDecTerm)
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}
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