73 lines
2.2 KiB
Go
73 lines
2.2 KiB
Go
// Copyright 2016-2020, 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 gen
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import (
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"strings"
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"unicode"
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)
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// isReservedWord returns true if s is a Go reserved word as per
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// https://golang.org/ref/spec#Keywords
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func isReservedWord(s string) bool {
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switch s {
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case "break", "default", "func", " interface", "select",
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"case", "defer", "go", "map", "struct",
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"chan", "else", "goto", "package", "switch",
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"const", "fallthrough", "if", "range", "type",
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"continue", "for", "import", "return", "var":
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return true
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default:
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return false
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}
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}
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// isLegalIdentifierStart returns true if it is legal for c to be the first character of a Go identifier as per
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// https://golang.org/ref/spec#Identifiers
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func isLegalIdentifierStart(c rune) bool {
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return c == '_' || unicode.In(c, unicode.Letter)
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}
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// isLegalIdentifierPart returns true if it is legal for c to be part of a Go identifier (besides the first character)
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// https://golang.org/ref/spec#Identifiers
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func isLegalIdentifierPart(c rune) bool {
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return c == '_' ||
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unicode.In(c, unicode.Letter, unicode.Digit)
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}
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// makeValidIdentifier replaces characters that are not allowed in Go identifiers with underscores. A reserved word is
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// prefixed with _. No attempt is made to ensure that the result is unique.
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func makeValidIdentifier(name string) string {
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var builder strings.Builder
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firstChar := 0
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for i, c := range name {
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// ptr dereference
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if i == 0 && c == '&' {
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firstChar++
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}
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if i == firstChar && !isLegalIdentifierStart(c) || i > 0 && !isLegalIdentifierPart(c) {
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builder.WriteRune('_')
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} else {
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builder.WriteRune(c)
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}
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}
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name = builder.String()
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if isReservedWord(name) {
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return "_" + name
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}
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return name
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}
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