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feat: add private meth string() returning an error 

error will be passed through all the converters
This commit is contained in:
sean 2023-04-10 21:37:44 +02:00
parent 5f699e34ac
commit 3a35ba062e
1 changed files with 34 additions and 17 deletions
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37
stringer.go
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@ -774,28 +774,40 @@ func (g *Generator) buildOneRun(runs [][]Value, typeName string) {
}
// Arguments to format are:
//
// [1]: type name
// [2]: size of index element (8 for uint8 etc.)
// [3]: less than zero check (for signed types)
const stringOneRun = `func (i %[1]s) String() string {
const stringOneRun = `func (i %[1]s) string() (string, error) {
if %[3]si >= %[1]s(len(_%[1]sIndex)-1) {
return fmt.Sprintf("%[1]s(%%d)", i)
return fmt.Sprintf("%[1]s(%%d)", i), fmt.Errorf("value is out of enum range")
}
return _%[1]sName[_%[1]sIndex[i]:_%[1]sIndex[i+1]]
return _%[1]sName[_%[1]sIndex[i]:_%[1]sIndex[i+1]], nil
}
func (i %[1]s) String() string {
val, _ := i.string()
return val
}
`
// Arguments to format are:
//
// [1]: type name
// [2]: lowest defined value for type, as a string
// [3]: size of index element (8 for uint8 etc.)
// [4]: less than zero check (for signed types)
const stringOneRunWithOffset = `func (i %[1]s) String() string {
const stringOneRunWithOffset = `func(i %[1]s) string() (string, error) {
i -= %[2]s
if %[4]si >= %[1]s(len(_%[1]sIndex)-1) {
return fmt.Sprintf("%[1]s(%%d)", i + %[2]s)
return fmt.Sprintf("%[1]s(%%d)", i + %[2]s), fmt.Errorf("value is out of enum range")
}
return _%[1]sName[_%[1]sIndex[i] : _%[1]sIndex[i+1]]
return _%[1]sName[_%[1]sIndex[i] : _%[1]sIndex[i+1]], nil
}
func (i %[1]s) String() string {
val, _ := i.string()
return val
}
`
@ -820,7 +832,7 @@ func (g *Generator) buildMultipleRuns(runs [][]Value, typeName string) {
typeName, i, typeName, i, typeName, i)
}
g.Printf("\tdefault:\n")
g.Printf("\t\treturn fmt.Sprintf(\"%s(%%d)\", i)\n", typeName)
g.Printf("\t\treturn fmt.Sprintf(\"%s(%%d)\", i)\n")
g.Printf("\t}\n")
g.Printf("}\n")
}
@ -861,10 +873,15 @@ func (g *Generator) buildNoOpOrderChangeDetect(runs [][]Value, typeName string)
}
// Argument to format is the type name.
const stringMap = `func (i %[1]s) String() string {
const stringMap = `func (i %[1]s) string() (string, error) {
if str, ok := _%[1]sMap[i]; ok {
return str, nil
}
return fmt.Sprintf("%[1]s(%%d)", i), fmt.Errorf("value is out of enum range")
}
func (i %[1]s) String() string {
str, _ := i.string()
return str
}
return fmt.Sprintf("%[1]s(%%d)", i)
}
`