b02a84b8d9
This code generator processes a bound Pulumi program represented using an HCL2-based IR and converts it to an equivalent Python program.
75 lines
2.6 KiB
Go
75 lines
2.6 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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"github.com/pulumi/pulumi/pkg/codegen"
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)
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// pythonKeywords is a map of reserved keywords used by python 2 and 3. We use this to avoid generating unspeakable
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// names in the resulting code. This map was sourced by merging the following reference material:
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//
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// * Python 2: https://docs.python.org/2.5/ref/keywords.html
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// * Python 3: https://docs.python.org/3/reference/lexical_analysis.html#keywords
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//
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var pythonKeywords = codegen.NewStringSet("false", "none", "true", "and", "as", "assert", "async", "await", "break",
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"class", "continue", "def", "del", "elif", "else", "except", "exec", "finally", "for", "from", "global", "if",
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"import", "in", "is", "lambda", "nonlocal", "not", "or", "pass", "print", "raise", "return", "try", "while",
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"with", "yield")
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func isReservedWord(word string) bool {
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return pythonKeywords.Has(word)
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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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// cleanName replaces characters that are not allowed in Python identifiers with underscores. No attempt is made to
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// ensure that the result is unique.
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func cleanName(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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