mirror of https://github.com/pulumi/pulumi.git
70 lines
2.0 KiB
Go
70 lines
2.0 KiB
Go
// Copyright 2016-2018, Pulumi Corporation.
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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 nodejs
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import (
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"io"
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"strings"
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"unicode"
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)
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// isLegalIdentifierStart returns true if it is legal for c to be the first character of a JavaScript identifier as per
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// ECMA-262.
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func isLegalIdentifierStart(c rune) bool {
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return c == '$' || c == '_' ||
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unicode.In(c, unicode.Lu, unicode.Ll, unicode.Lt, unicode.Lm, unicode.Lo, unicode.Nl)
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}
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// isLegalIdentifierPart returns true if it is legal for c to be part of a JavaScript identifier (besides the first
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// character) as per ECMA-262.
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func isLegalIdentifierPart(c rune) bool {
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return isLegalIdentifierStart(c) || unicode.In(c, unicode.Mn, unicode.Mc, unicode.Nd, unicode.Pc)
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}
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// isLegalIdentifier returns true if s is a legal JavaScript identifier as per ECMA-262.
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func isLegalIdentifier(s string) bool {
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reader := strings.NewReader(s)
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c, _, _ := reader.ReadRune()
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if !isLegalIdentifierStart(c) {
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return false
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}
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for {
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c, _, err := reader.ReadRune()
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if err != nil {
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return err == io.EOF
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}
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if !isLegalIdentifierPart(c) {
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return false
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}
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}
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}
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// cleanName replaces characters that are not allowed in JavaScript identifiers with underscores. No attempt is made to
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// ensure that the result is unique.
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func cleanName(name string) string {
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var builder strings.Builder
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for i, c := range name {
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if !isLegalIdentifierPart(c) {
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builder.WriteRune('_')
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} else {
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if i == 0 && !isLegalIdentifierStart(c) {
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builder.WriteRune('_')
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}
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builder.WriteRune(c)
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}
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}
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return builder.String()
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}
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