go/dev-expr
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main.go: expr's tag date added and new bin() function

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This commit is contained in:
Celestino Amoroso 2025-03-08 11:40:07 +01:00
parent 9ca9d23315
commit 2b364efb98
1 changed files with 47 additions and 2 deletions
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49
main.go
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@ -20,7 +20,7 @@ import (
const (
intro = PROGNAME + ` -- Expressions calculator ` + VERSION + `
Based on the Expr package ` + EXPR_VERSION + `
Based on the Expr package ` + EXPR_VERSION + ` (` + EXPR_DATE + `)
Type help to get the list of available commands
See also https://git.portale-stac.it/go-pkg/expr/src/branch/main/README.adoc
`
@ -243,7 +243,8 @@ func isReaderTerminal(r io.Reader) bool {
func registerLocalFunctions(ctx expr.ExprContext) {
const (
devParamProp = "prop"
devParamProp = "prop"
devParamDigits = "digits"
)
aboutFunc := func(ctx expr.ExprContext, name string, args map[string]any) (result any, err error) {
@ -300,6 +301,46 @@ func registerLocalFunctions(ctx expr.ExprContext) {
return
}
binFunc := func(ctx expr.ExprContext, name string, args map[string]any) (result any, err error) {
var value, digits int64
var ok bool
var sb strings.Builder
if value, ok = args[expr.ParamValue].(int64); !ok {
err = expr.ErrExpectedGot(name, expr.TypeInt, args[expr.ParamValue])
return
}
if digits, ok = args[devParamDigits].(int64); !ok {
err = expr.ErrExpectedGot(name, expr.TypeInt, args[devParamDigits])
return
}
if digits != 64 && digits != 32 && digits != 16 && digits != 8 {
err = fmt.Errorf("%s param allows 8, 16, 32, or 64 values only", devParamDigits)
return
}
mask := uint64(0)
for i := 0; i < int(digits); i++ {
mask |= (1 << i)
}
maskedValue := uint64(value) & mask
// if maskedValue != uint64(value) {
// err = fmt.Errorf("%s param (%d) is not compatible with the value (%d) of %s param", expr.ParamValue, value, digits, devParamDigits)
// return
// }
for i := int(digits) - 1; i >= 0; i-- {
if maskedValue&(1<<i) == 0 {
sb.WriteByte('0')
} else {
sb.WriteByte('1')
}
}
result = sb.String()
return
}
ctx.RegisterFunc("about", expr.NewGolangFunctor(aboutFunc), expr.TypeString, []expr.ExprFuncParam{})
ctx.RegisterFunc("ctrlList", expr.NewGolangFunctor(ctrlListFunc), expr.TypeListOfStrings, []expr.ExprFuncParam{})
ctx.RegisterFunc("ctrl", expr.NewGolangFunctor(ctrlFunc), expr.TypeAny, []expr.ExprFuncParam{
@ -314,6 +355,10 @@ func registerLocalFunctions(ctx expr.ExprContext) {
expr.NewFuncParam(expr.ParamName),
})
ctx.RegisterFunc("bin", expr.NewGolangFunctor(binFunc), expr.TypeInt, []expr.ExprFuncParam{
expr.NewFuncParam(expr.ParamValue),
expr.NewFuncParamFlagDef(devParamDigits, expr.PfOptional|expr.PfDefault, int64(8)),
})
}
func main() {