129 lines
3.7 KiB
Go
129 lines
3.7 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 nodejs
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import (
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"io"
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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 reserved word as per ECMA-262.
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func isReservedWord(s string) bool {
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switch s {
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case "break", "case", "catch", "class", "const", "continue", "debugger", "default", "delete",
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"do", "else", "export", "extends", "finally", "for", "function", "if", "import",
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"in", "instanceof", "new", "return", "super", "switch", "this", "throw", "try",
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"typeof", "var", "void", "while", "with", "yield":
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// Keywords
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return true
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case "enum", "await", "implements", "interface", "package", "private", "protected", "public":
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// Future reserved words
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return true
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case "null", "true", "false":
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// Null and boolean literals
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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 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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if isReservedWord(s) {
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return false
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}
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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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// makeValidIdentifier replaces characters that are not allowed in JavaScript identifiers with underscores. No attempt
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// 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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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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// Replace common single character enum names.
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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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// If the enum name starts with an underscore, add the type name as a prefix.
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if strings.HasPrefix(safeName, "_") {
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safeName = typeName + safeName
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}
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return safeName, nil
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}
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