70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
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// All rights reserved.
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// operator-dot.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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)
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// -------- dot term
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func newDotTerm(tk *Token) (inst *term) {
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return &term{
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tk: *tk,
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children: make([]*term, 0, 2),
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position: posInfix,
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priority: priDot,
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evalFunc: evalDot,
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}
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}
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func evalDot(ctx kern.ExprContext, opTerm *term) (v any, err error) {
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var leftValue, rightValue any
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if err = opTerm.checkOperands(); err != nil {
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return
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}
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if leftValue, err = opTerm.children[0].Compute(ctx); err != nil {
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return
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}
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indexTerm := opTerm.children[1]
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switch unboxedValue := leftValue.(type) {
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case kern.ExtIterator:
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if indexTerm.symbol() == SymVariable /*|| indexTerm.symbol() == SymString */ {
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opName := indexTerm.Source()
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if unboxedValue.HasOperation(opName) {
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v, err = unboxedValue.CallOperation(opName, map[string]any{})
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} else {
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err = indexTerm.Errorf("this iterator do not support the %q command", opName)
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v = false
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}
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} else {
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err = indexTerm.tk.ErrorExpectedGot("identifier")
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}
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case *kern.DictType:
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s := opTerm.children[1].symbol()
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if s == SymVariable || s == SymString {
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src := opTerm.children[1].Source()
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if len(src) > 1 && src[0] == '"' && src[len(src)-1] == '"' {
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src = src[1 : len(src)-1]
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}
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v, err = unboxedValue.GetItem(src)
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} else if rightValue, err = opTerm.children[1].Compute(ctx); err == nil {
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v, err = unboxedValue.GetItem(rightValue)
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}
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default:
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if rightValue, err = opTerm.children[1].Compute(ctx); err == nil {
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err = opTerm.errIncompatibleTypes(leftValue, rightValue)
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}
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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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registerTermConstructor(SymDot, newDotTerm)
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}
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