76 lines
2.0 KiB
Go
76 lines
2.0 KiB
Go
// Copyright (c) 2024-2026 Celestino Amoroso (celestino.amoroso@gmail.com).
|
|
// All rights reserved.
|
|
|
|
// operator-dot.go
|
|
package expr
|
|
|
|
import (
|
|
"git.portale-stac.it/go-pkg/expr/kern"
|
|
"git.portale-stac.it/go-pkg/expr/scan"
|
|
)
|
|
|
|
// -------- dot term
|
|
func newDotTerm(tk *scan.Token) (inst *scan.Term) {
|
|
return &scan.Term{
|
|
Tk: *tk,
|
|
Children: make([]*scan.Term, 0, 2),
|
|
Position: scan.PosInfix,
|
|
Priority: scan.PriDot,
|
|
EvalFunc: evalDot,
|
|
}
|
|
}
|
|
|
|
func evalDot(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
|
|
var leftValue, rightValue any
|
|
|
|
if err = opTerm.CheckOperands(); err != nil {
|
|
return
|
|
}
|
|
if leftValue, err = opTerm.Children[0].Compute(ctx); err != nil {
|
|
return
|
|
}
|
|
|
|
indexTerm := opTerm.Children[1]
|
|
|
|
switch unboxedValue := leftValue.(type) {
|
|
case kern.ExtIterator:
|
|
if indexTerm.Tk.Sym == scan.SymVariable /*|| indexTerm.Tk.Sym == scan.SymString */ {
|
|
opName := indexTerm.Source()
|
|
if unboxedValue.HasOperation(opName) {
|
|
v, err = unboxedValue.CallOperation(opName, map[string]any{})
|
|
} else {
|
|
err = indexTerm.Errorf("this iterator do not support the %q command", opName)
|
|
v = false
|
|
}
|
|
} else {
|
|
err = indexTerm.Tk.ErrorExpectedGot("identifier")
|
|
}
|
|
case *kern.DictType:
|
|
var ok bool
|
|
s := opTerm.Children[1].Tk.Sym
|
|
if s == scan.SymVariable || s == scan.SymString {
|
|
src := opTerm.Children[1].Source()
|
|
if len(src) > 1 && src[0] == '"' && src[len(src)-1] == '"' {
|
|
src = src[1 : len(src)-1]
|
|
}
|
|
if v, ok = unboxedValue.GetItem(src); !ok {
|
|
err = opTerm.Errorf("key %q not found", src)
|
|
}
|
|
} else if rightValue, err = opTerm.Children[1].Compute(ctx); err == nil {
|
|
if v, ok = unboxedValue.GetItem(rightValue); !ok {
|
|
err = opTerm.Errorf("key %q not found", rightValue)
|
|
}
|
|
}
|
|
default:
|
|
if rightValue, err = opTerm.Children[1].Compute(ctx); err == nil {
|
|
err = opTerm.Errorf("incompatible types: %s and %s", kern.TypeName(leftValue), kern.TypeName(rightValue))
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
// init
|
|
func init() {
|
|
scan.RegisterTermConstructor(scan.SymDot, newDotTerm)
|
|
}
|