91 lines
2.8 KiB
Go
91 lines
2.8 KiB
Go
package python
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import (
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"fmt"
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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/pulumi/pulumi/pkg/v3/codegen"
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)
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// isLegalIdentifierStart returns true if it is legal for c to be the first character of a Python identifier as per
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// https://docs.python.org/3.7/reference/lexical_analysis.html#identifiers.
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func isLegalIdentifierStart(c rune) bool {
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return c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || 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 Python identifier (besides the first
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// character) as per https://docs.python.org/3.7/reference/lexical_analysis.html#identifiers.
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func isLegalIdentifierPart(c rune) bool {
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return isLegalIdentifierStart(c) || c >= '0' && c <= '9' ||
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unicode.In(c, unicode.Lu, unicode.Ll, unicode.Lt, unicode.Lm, unicode.Lo, unicode.Nl, unicode.Mn, unicode.Mc,
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unicode.Nd, unicode.Pc)
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}
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// isLegalIdentifier returns true if s is a legal Python identifier as per
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// https://docs.python.org/3.7/reference/lexical_analysis.html#identifiers.
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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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// makeValidIdentifier replaces characters that are not allowed in Python identifiers with underscores. No attempt is
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// 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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return builder.String()
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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 "", fmt.Errorf("enum name %s is not a valid identifier", safeName)
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}
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// If it's camelCase, change it to snake_case.
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safeName = PyName(safeName)
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// Change to uppercase and make a valid identifier.
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safeName = makeValidIdentifier(strings.ToTitle(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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pyTypeName := strings.ToTitle(PyName(typeName))
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safeName = pyTypeName + safeName
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}
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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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return safeName, nil
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}
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