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utilities.go
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/
utilities.go
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// Copyright 2016-2020, Pulumi Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gen
import (
"fmt"
"regexp"
"strings"
"unicode"
"github.com/pulumi/pulumi/pkg/v3/codegen"
"github.com/pulumi/pulumi/pkg/v3/codegen/cgstrings"
"github.com/pulumi/pulumi/pkg/v3/codegen/schema"
"github.com/pulumi/pulumi/sdk/v3/go/common/util/contract"
)
// isReservedWord returns true if s is a Go reserved word as per
// https://golang.org/ref/spec#Keywords
func isReservedWord(s string) bool {
switch s {
case "break", "default", "func", " interface", "select",
"case", "defer", "go", "map", "struct",
"chan", "else", "goto", "package", "switch",
"const", "fallthrough", "if", "range", "type",
"continue", "for", "import", "return", "var":
return true
default:
return false
}
}
// isReservedResourceField returns true if s would conflict with a method on a generated
// resource.
func isReservedResourceField(resourceName, s string) bool {
switch s {
case "ID", "URN", "GetProvider", "ElementType":
return true
default:
if resourceName != "" {
toOutput := "To" + resourceName + "Output"
return s == toOutput || s == toOutput+"WithContext"
}
return false
}
}
// isLegalIdentifierStart returns true if it is legal for c to be the first character of a Go identifier as per
// https://golang.org/ref/spec#Identifiers
func isLegalIdentifierStart(c rune) bool {
return c == '_' || unicode.In(c, unicode.Letter)
}
// isLegalIdentifierPart returns true if it is legal for c to be part of a Go identifier (besides the first character)
// https://golang.org/ref/spec#Identifiers
func isLegalIdentifierPart(c rune) bool {
return c == '_' ||
unicode.In(c, unicode.Letter, unicode.Digit)
}
// makeValidIdentifier replaces characters that are not allowed in Go identifiers with underscores. A reserved word is
// prefixed with _. No attempt is made to ensure that the result is unique.
func makeValidIdentifier(name string) string {
var builder strings.Builder
for i, c := range name {
// ptr dereference
if i == 0 && c == '&' {
builder.WriteRune(c)
continue
}
if !isLegalIdentifierPart(c) {
builder.WriteRune('_')
} else {
if i == 0 && !isLegalIdentifierStart(c) {
builder.WriteRune('_')
}
builder.WriteRune(c)
}
}
name = builder.String()
if isReservedWord(name) {
return "_" + name
}
return name
}
func makeSafeEnumName(name, typeName string) (string, error) {
safeName := codegen.ExpandShortEnumName(name)
// If the name is one illegal character, return an error.
if len(safeName) == 1 && !isLegalIdentifierStart(rune(safeName[0])) {
return "", fmt.Errorf("enum name %s is not a valid identifier", safeName)
}
// Capitalize and make a valid identifier.
safeName = enumTitle(safeName)
safeName = makeValidIdentifier(safeName)
// If there are multiple underscores in a row, replace with one.
regex := regexp.MustCompile(`_+`)
safeName = regex.ReplaceAllString(safeName, "_")
// Add the type to the name to disambiguate constants used for enum values
if strings.Contains(safeName, "_") && !strings.HasPrefix(safeName, "_") {
safeName = fmt.Sprintf("_%s", safeName)
}
safeName = typeName + safeName
return safeName, nil
}
// Title converts the input string to a title case
// where only the initial letter is upper-cased.
// It also removes $-prefix if any.
func enumTitle(s string) string {
if s == "" {
return ""
}
if s[0] == '$' {
return Title(s[1:])
}
s = cgstrings.UppercaseFirst(s)
return cgstrings.ModifyStringAroundDelimeter(s, "-", func(next string) string {
return "_" + cgstrings.UppercaseFirst(next)
})
}
// Calculate the name of a field in a resource
func fieldName(pkg *pkgContext, r *schema.Resource, p *schema.Property) string {
s := Title(p.Name)
var name string
if r != nil {
name = disambiguatedResourceName(r, pkg)
}
if !isReservedResourceField(name, s) {
return s
}
res := s + "_"
contract.Assert(!isReservedResourceField(name, res))
return res
}