format: normalize quote style across single, double, and backtick strings#164
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Convert string literals to a preferred quote style: double quotes by default, single quotes when the content contains a double quote, and backticks when it contains both a double and a single quote. Applies to rval strings (via the quoted_string choke point) and promisers.
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olehermanse
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Jun 24, 2026
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| Backtick strings are taken literally - CFEngine processes no escapes | ||
| inside them. Single- and double-quoted strings recognize only the escapes |
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This is not true, backtick strings are treated the same, and escapes are processed.
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| if nxt == "\n": # line continuation: drop both characters | ||
| i += 2 | ||
| continue |
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This behavior was not requested and is not covered by the test.
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| if c == "\\" and i + 1 < len(inner): | ||
| nxt = inner[i + 1] | ||
| if nxt in ("\\", '"', "'"): | ||
| out.append(nxt) | ||
| i += 2 | ||
| continue |
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The formatting test does not have \\ (or \\\\), should cover that too.
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| if ( | ||
| len(literal) < 2 | ||
| or literal[0] != literal[-1] | ||
| or literal[0] not in ("'", '"', "`") | ||
| ): | ||
| return literal |
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Should this be an assert? I don't see when this would be the case?
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| if target == "`" and "`" in content: | ||
| # Needs all three quote styles at once; a backtick string cannot | ||
| # contain a backtick, so leave the literal as written. | ||
| return literal |
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This is also not covered in the test.
Address review on PR #164: - Backtick strings process the SAME escapes as single/double quotes (\\, \", \'); a backtick string is not literal. Its only special property is that the delimiter itself cannot be escaped, so a literal backtick can never appear inside one. Unified _decode_literal (drops its delim arg) and _encode_literal (now escapes backslashes for backticks too) accordingly. - Removed the unrequested backslash-newline line-continuation handling from _decode_literal. - Turned the literal-shape guard in _normalize_quotes into an assert, since callers always pass a real quoted_string literal. - Expanded the 012_quotes golden fixture with backslash cases (l/m/n/p) and an all-three-quotes case (o) to cover the unified escape behavior and the backtick encode branch. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01U4hEZuqiuEFH2zy8wWGwyD
olehermanse
requested changes
Jun 24, 2026
Replaced the _decode_literal/_encode_literal helpers with a single-pass, escape-aware re-quote (_scan_quotes + _requote) so converting between quote styles passes through escaped backslashes, line continuations, and other backslash sequences unchanged, and only re-escapes the target delimiter quote character. The old decode/encode round-trip would mangle a single-quoted line-continuation string into a doubled backslash. Fixed fixture case q to convert a single-quoted line-continuation string to double quotes with the continuation preserved verbatim. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01U4hEZuqiuEFH2zy8wWGwyD
nickanderson
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Jul 22, 2026
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I agree with the suggested expectations I just think this should require opting in, not done by default with format. Something link could surface. But then I or someone else will also ask for a way to suppress the warning with some kind of comment.
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Requested by Ole Herman · Slack thread
Before / After
cfengine formatnow normalizes string-literal quote style across double, single, and backtick quotes. It prefers double quotes; falls back to single quotes when the string contains a double-quote character; and uses backticks only when the string contains both a double and a single quote.Examples:
'hello'becomes"hello"`hello`becomes"hello"'say "hi"'stays single-quoted (it contains a double quote but no single quote)`say "hi"`becomes'say "hi"''he said "hi" it\'s') becomes the backtick form`he said "hi" it's`If a string somehow needs all three styles at once (it contains a double quote, a single quote, and a backtick), it is left unchanged, since no single style can hold it without escaping.
How
A
_normalize_quotes/_decode_literal/_encode_literaltrio insrc/cfengine_cli/format.pydecodes a literal to its logical content (honoring CFEngine's escaping rules — single/double quotes recognize only\\,\",\', and a backslash-newline line continuation; backticks process no escapes), chooses the preferred style from that content, and re-encodes. It is applied at thequoted_stringchoke point (stringify_single_line_node) and the promiser site (_promiser_text), covered by thetests/format/012_quotesgolden fixture.Note for review
Promisers are normalized too (e.g.
reports: 'hello';becomesreports: "hello";). Calling this out explicitly so it can be vetoed if promisers should be left alone.Generated by Claude Code