go-pkg/expr
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New var() function added to the builtin set

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This commit is contained in:
Celestino Amoroso 2026-04-15 16:04:12 +02:00
parent f8d12b1a93
commit 037565c41e
2 changed files with 28 additions and 0 deletions
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24
builtin-base.go
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@ -211,6 +211,25 @@ func evalFunc(ctx ExprContext, name string, args map[string]any) (result any, er
return
}
func varFunc(ctx ExprContext, name string, args map[string]any) (result any, err error) {
var varName string
var ok bool
if varName, ok = args[ParamName].(string); !ok {
return nil, ErrWrongParamType(name, ParamName, TypeString, args[ParamName])
}
if result, ok = args[ParamValue]; ok && result != nil {
ctx.GetParent().UnsafeSetVar(varName, result)
// } else {
// err = ErrWrongParamType(name, ParamSource, TypeString, args[ParamSource])
// }
} else if result, ok = ctx.GetVar(varName); !ok {
err = ErrUnknownVar(name, varName)
}
return
}
//// import
func ImportBuiltinsFuncs(ctx ExprContext) {
@ -240,6 +259,11 @@ func ImportBuiltinsFuncs(ctx ExprContext) {
ctx.RegisterFunc("eval", NewGolangFunctor(evalFunc), TypeAny, []ExprFuncParam{
NewFuncParam(ParamSource),
})
ctx.RegisterFunc("var", NewGolangFunctor(varFunc), TypeAny, []ExprFuncParam{
NewFuncParam(ParamName),
NewFuncParamFlagDef(ParamValue, PfDefault, nil),
})
}
func init() {

4
common-errors.go
View File

@ -80,6 +80,10 @@ func ErrUnknownParam(funcName, paramName string) error {
return fmt.Errorf("%s(): unknown parameter %q", funcName, paramName)
}
func ErrUnknownVar(funcName, varName string) error {
return fmt.Errorf("%s(): unknown variable %q", funcName, varName)
}
// --- Operator errors
func ErrLeftOperandMustBeVariable(leftTerm, opTerm *term) error {