go-pkg/expr
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several changes:

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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.
This commit is contained in:
Celestino Amoroso
2026-07-27 16:01:52 +02:00
parent 07aecfc4e7
commit 8e596d5979
63 changed files with 1125 additions and 755 deletions
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operand-literal.go
+8 -7
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@@ -7,13 +7,14 @@ package expr
import (
"git.portale-stac.it/go-pkg/expr/kern"
"git.portale-stac.it/go-pkg/expr/scan"
"git.portale-stac.it/go-pkg/expr/sym"
"git.portale-stac.it/go-pkg/expr/types/fract"
)
// -------- literal term
func newLiteralTerm(tk *scan.Token) *scan.Term {
if tk.Sym == scan.SymFraction {
if tk.Sym == sym.SymFraction {
if v, isString := tk.Value.(string); isString {
var err error
if tk.Value, err = fract.MakeGeneratingFraction(v); err != nil {
@@ -40,10 +41,10 @@ func evalLiteral(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
// init
func init() {
scan.RegisterTermConstructor(scan.SymString, newLiteralTerm)
scan.RegisterTermConstructor(scan.SymInteger, newLiteralTerm)
scan.RegisterTermConstructor(scan.SymFloat, newLiteralTerm)
scan.RegisterTermConstructor(scan.SymFraction, newLiteralTerm)
scan.RegisterTermConstructor(scan.SymBool, newLiteralTerm)
scan.RegisterTermConstructor(scan.SymKwNil, newLiteralTerm)
scan.RegisterTermConstructor(sym.SymString, newLiteralTerm)
scan.RegisterTermConstructor(sym.SymInteger, newLiteralTerm)
scan.RegisterTermConstructor(sym.SymFloat, newLiteralTerm)
scan.RegisterTermConstructor(sym.SymFraction, newLiteralTerm)
scan.RegisterTermConstructor(sym.SymBool, newLiteralTerm)
scan.RegisterTermConstructor(sym.SymKwNil, newLiteralTerm)
}