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