106 lines
3.1 KiB
Go
106 lines
3.1 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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"fmt"
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"regexp"
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"strings"
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"unicode"
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"github.com/pkg/errors"
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"github.com/pulumi/pulumi/pkg/v3/codegen"
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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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for i, c := range name {
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// ptr dereference
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if i == 0 && c == '&' {
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builder.WriteRune(c)
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continue
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}
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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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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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func makeSafeEnumName(name, typeName string) (string, error) {
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safeName := codegen.ExpandShortEnumName(name)
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// If the name is one illegal character, return an error.
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if len(safeName) == 1 && !isLegalIdentifierStart(rune(safeName[0])) {
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return "", errors.Errorf("enum name %s is not a valid identifier", safeName)
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}
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// Capitalize and make a valid identifier.
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safeName = makeValidIdentifier(Title(safeName))
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// If there are multiple underscores in a row, replace with one.
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regex := regexp.MustCompile(`_+`)
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safeName = regex.ReplaceAllString(safeName, "_")
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// Add the type to the name to disambiguate constants used for enum values
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if strings.Contains(safeName, "_") && !strings.HasPrefix(safeName, "_") {
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safeName = fmt.Sprintf("_%s", safeName)
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}
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safeName = typeName + safeName
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return safeName, nil
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}
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