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139 lines
3.0 KiB
Go
Vendored
139 lines
3.0 KiB
Go
Vendored
package flags
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import (
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"fmt"
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)
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// ErrorType represents the type of error.
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type ErrorType uint
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const (
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// ErrUnknown indicates a generic error.
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ErrUnknown ErrorType = iota
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// ErrExpectedArgument indicates that an argument was expected.
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ErrExpectedArgument
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// ErrUnknownFlag indicates an unknown flag.
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ErrUnknownFlag
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// ErrUnknownGroup indicates an unknown group.
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ErrUnknownGroup
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// ErrMarshal indicates a marshalling error while converting values.
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ErrMarshal
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// ErrHelp indicates that the built-in help was shown (the error
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// contains the help message).
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ErrHelp
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// ErrNoArgumentForBool indicates that an argument was given for a
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// boolean flag (which don't not take any arguments).
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ErrNoArgumentForBool
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// ErrRequired indicates that a required flag was not provided.
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ErrRequired
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// ErrShortNameTooLong indicates that a short flag name was specified,
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// longer than one character.
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ErrShortNameTooLong
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// ErrDuplicatedFlag indicates that a short or long flag has been
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// defined more than once
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ErrDuplicatedFlag
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// ErrTag indicates an error while parsing flag tags.
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ErrTag
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// ErrCommandRequired indicates that a command was required but not
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// specified
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ErrCommandRequired
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// ErrUnknownCommand indicates that an unknown command was specified.
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ErrUnknownCommand
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// ErrInvalidChoice indicates an invalid option value which only allows
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// a certain number of choices.
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ErrInvalidChoice
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// ErrInvalidTag indicates an invalid tag or invalid use of an existing tag
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ErrInvalidTag
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)
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func (e ErrorType) String() string {
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switch e {
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case ErrUnknown:
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return "unknown"
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case ErrExpectedArgument:
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return "expected argument"
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case ErrUnknownFlag:
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return "unknown flag"
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case ErrUnknownGroup:
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return "unknown group"
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case ErrMarshal:
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return "marshal"
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case ErrHelp:
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return "help"
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case ErrNoArgumentForBool:
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return "no argument for bool"
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case ErrRequired:
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return "required"
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case ErrShortNameTooLong:
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return "short name too long"
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case ErrDuplicatedFlag:
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return "duplicated flag"
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case ErrTag:
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return "tag"
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case ErrCommandRequired:
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return "command required"
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case ErrUnknownCommand:
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return "unknown command"
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case ErrInvalidChoice:
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return "invalid choice"
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case ErrInvalidTag:
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return "invalid tag"
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}
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return "unrecognized error type"
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}
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func (e ErrorType) Error() string {
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return e.String()
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}
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// Error represents a parser error. The error returned from Parse is of this
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// type. The error contains both a Type and Message.
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type Error struct {
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// The type of error
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Type ErrorType
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// The error message
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Message string
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}
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// Error returns the error's message
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func (e *Error) Error() string {
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return e.Message
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}
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func newError(tp ErrorType, message string) *Error {
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return &Error{
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Type: tp,
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Message: message,
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}
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}
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func newErrorf(tp ErrorType, format string, args ...interface{}) *Error {
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return newError(tp, fmt.Sprintf(format, args...))
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}
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func wrapError(err error) *Error {
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ret, ok := err.(*Error)
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if !ok {
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return newError(ErrUnknown, err.Error())
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}
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return ret
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}
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