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package api
import (
"fmt"
"strconv"
"strings"
)
// Signature provides access to details about the signature of an instruction function.
type Signature interface {
ParameterList() string
Arguments() string
ParameterName(int) string
ParameterSlice() string
Length() string
}
// ArgsList builds a signature for a function with the named parameters.
func ArgsList(args []string) Signature {
return argslist(args)
}
type argslist []string
func (a argslist) ParameterList() string { return strings.Join(a, ", ") + " " + OperandType }
func (a argslist) Arguments() string { return strings.Join(a, ", ") }
func (a argslist) ParameterName(i int) string { return a[i] }
func (a argslist) ParameterSlice() string {
return fmt.Sprintf("[]%s{%s}", OperandType, strings.Join(a, ", "))
}
func (a argslist) Length() string { return strconv.Itoa(len(a)) }
// Variadic is the signature for a variadic function with the named argument slice.
func Variadic(name string) Signature {
return variadic{name: name}
}
type variadic struct {
name string
}
func (v variadic) ParameterList() string { return v.name + " ..." + OperandType }
func (v variadic) Arguments() string { return v.name + "..." }
func (v variadic) ParameterName(i int) string { return fmt.Sprintf("%s[%d]", v.name, i) }
func (v variadic) ParameterSlice() string { return v.name }
func (v variadic) Length() string { return fmt.Sprintf("len(%s)", v.name) }
// Niladic is the signature for a function with no arguments.
func Niladic() Signature {
return niladic{}
}
type niladic struct{}
func (n niladic) ParameterList() string { return "" }
func (n niladic) Arguments() string { return "" }
func (n niladic) ParameterName(i int) string { panic("niladic function has no parameters") }
func (n niladic) ParameterSlice() string { return fmt.Sprintf("[]%s{}", OperandType) }
func (n niladic) Length() string { return "0" }
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