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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operator-sign.go
+5 -4
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@@ -7,6 +7,7 @@ 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"
"git.portale-stac.it/go-pkg/expr/types/float"
)
@@ -41,14 +42,14 @@ func evalSign(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
}
if float.IsFloat(rightValue) {
if opTerm.Tk.Sym == scan.SymChangeSign {
if opTerm.Tk.Sym == sym.SymChangeSign {
f, _ := rightValue.(float64)
v = -f
} else {
v = rightValue
}
} else if types.IsInteger(rightValue) {
if opTerm.Tk.Sym == scan.SymChangeSign {
if opTerm.Tk.Sym == sym.SymChangeSign {
i, _ := rightValue.(int64)
v = -i
} else {
@@ -62,6 +63,6 @@ func evalSign(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
// init
func init() {
scan.RegisterTermConstructor(scan.SymUnchangeSign, newPlusSignTerm)
scan.RegisterTermConstructor(scan.SymChangeSign, newMinusSignTerm)
scan.RegisterTermConstructor(sym.SymUnchangeSign, newPlusSignTerm)
scan.RegisterTermConstructor(sym.SymChangeSign, newMinusSignTerm)
}