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69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
// Copyright 2019 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package argparser
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import (
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"errors"
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"strconv"
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)
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type OptionType int
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const (
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OptionalFlag OptionType = iota
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OptionalValue
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OptionalEmptyValue
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)
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type ValidationFunc func(string) error
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// Convenience validation function that asserts that an arg is an integer
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func isIntStr(str string) error {
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_, err := strconv.ParseInt(str, 10, 32)
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if err != nil {
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return errors.New("error: \"" + str + "\" is not a valid int.")
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}
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return nil
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}
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// Convenience validation function that asserts that an arg is an unsigned integer
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func isUintStr(str string) error {
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_, err := strconv.ParseUint(str, 10, 64)
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if err != nil {
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return errors.New("error: \"" + str + "\" is not a valid uint.")
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}
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return nil
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}
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// An Option encapsulates all the information necessary to represent and parse a command line argument.
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type Option struct {
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// Long name for this Option, specified on the command line with --Name. Required.
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Name string
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// Abbreviated name for this Option, specified on the command line with -Abbrev. Optional.
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Abbrev string
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// Brief description of the Option.
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ValDesc string
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// The type of this option, either a flag or a value.
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OptType OptionType
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// Longer help text for the option.
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Desc string
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// Function to validate an Option after parsing, returning any error.
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Validator ValidationFunc
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// Allows more than one arg to an Option.
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AllowMultipleOptions bool
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}
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