59 lines
1.8 KiB
Go
59 lines
1.8 KiB
Go
package python
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import (
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"io"
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"strings"
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"unicode"
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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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