camoroso
8e596d5979
1. moved scan/symbol.go to new package sym and adapted all files that reference Symbol type and its values. 2. new type interval defined by begin, end and step values. 3. replaced operator-range.go with operator-interval.go. 4. replaced range operator begin:end with begin..end..step. 5. new implementation of sub-collection extraction based on new interval literal.
93 lines
2.5 KiB
Go
93 lines
2.5 KiB
Go
// Copyright (c) 2024-2026 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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"git.portale-stac.it/go-pkg/expr/scan"
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"git.portale-stac.it/go-pkg/expr/sym"
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"git.portale-stac.it/go-pkg/expr/types/dict"
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"git.portale-stac.it/go-pkg/expr/util"
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)
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// -------- dot term
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func newDotTerm(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, 2),
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Position: scan.PosInfix,
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Priority: scan.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 *scan.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() == sym.SymVariable /*|| indexTerm.Tk.Sym == sym.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 *dict.DictType:
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v, err = dotGetDictItemValue(ctx, unboxedValue, opTerm.Children[1])
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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.Errorf("incompatible types: %s and %s", kern.TypeName(leftValue), kern.TypeName(rightValue))
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}
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}
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return
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}
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func dotGetDictItemValue(ctx kern.ExprContext, d *dict.DictType, rightTerm *scan.Term) (v any, err error) {
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var ok bool
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var rightValue any
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s := rightTerm.Symbol()
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if s == sym.SymVariable || s == sym.SymString {
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// src := rightTerm.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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src := util.UnquoteString(rightTerm.Source())
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if v, ok = d.GetItem(src); !ok {
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err = errDictKeyNotFound(rightTerm, src)
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}
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} else if rightValue, err = rightTerm.Compute(ctx); err == nil {
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if v, ok = d.GetItem(rightValue); !ok {
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err = errDictKeyNotFound(rightTerm, rightValue)
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}
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}
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return
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}
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func errDictKeyNotFound(term *scan.Term, key any) error {
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if s, ok := key.(string); ok {
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return term.Errorf("key %q not found", s)
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}
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return term.Errorf("key %v not found", key)
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}
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// init
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func init() {
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scan.RegisterTermConstructor(sym.SymDot, newDotTerm)
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}
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