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43 lines
1.6 KiB
43 lines
1.6 KiB
// Copyright 2018 Google LLC All Rights Reserved.
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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 name
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import (
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"strings"
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"unicode/utf8"
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)
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// stripRunesFn returns a function which returns -1 (i.e. a value which
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// signals deletion in strings.Map) for runes in 'runes', and the rune otherwise.
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func stripRunesFn(runes string) func(rune) rune {
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return func(r rune) rune {
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if strings.ContainsRune(runes, r) {
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return -1
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}
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return r
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}
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}
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// checkElement checks a given named element matches character and length restrictions.
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// Returns true if the given element adheres to the given restrictions, false otherwise.
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func checkElement(name, element, allowedRunes string, minRunes, maxRunes int) error {
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numRunes := utf8.RuneCountInString(element)
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if (numRunes < minRunes) || (maxRunes < numRunes) {
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return newErrBadName("%s must be between %d and %d characters in length: %s", name, minRunes, maxRunes, element)
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} else if len(strings.Map(stripRunesFn(allowedRunes), element)) != 0 {
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return newErrBadName("%s can only contain the characters `%s`: %s", name, allowedRunes, element)
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}
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return nil
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}
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