fix(generator): keep repeatable lookahead on wrapped option-looking lines - #4664
fix(generator): keep repeatable lookahead on wrapped option-looking lines#4664thomhurst wants to merge 10 commits into
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…ines HelpDeclaresRepeatableOption stopped its block scan at the first line matching OptionLinePattern, so a wrapped description line that started with another option's switch hid a repeatable phrase split across it. Walk the block with the shared IsContinuationLine rule instead, keeping the blank-line and option-row bounds gcloud relies on. A null declarationIndentation now means "no indentation floor", and the inline-description column derivation is shared with AccumulateWrappedDescription via GetDescriptionColumn. Closes #4655 Claude-Session: https://claude.ai/code/session_01EHe9J8SumuZb2NBZxpGBzc
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Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughThe CLI scraper now infers description columns and applies shared continuation rules when scanning repeatable-option descriptions. Wrapped lines that resemble option rows can remain in the description when their indentation identifies continuation prose. New tests cover column inference and option boundaries. ChangesCLI continuation handling
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to CLI option scraping now correctly scans wrapped descriptions containing option-like text while preserving boundaries between sibling options. The updated parsing behavior has focused regression coverage and presents no remaining merge-blocking risk. Poem
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| /// Captures the inline description of a generic option row: the text after the first | ||
| /// run of two or more blanks that follows the switches and any value hint. | ||
| /// </summary> | ||
| [GeneratedRegex(@"^[ \t]*\S.*?[ \t]{2,}(?<description>\S.*)$")] |
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For tab-aligned help such as \t--env stringArray\tSet environment variables, this pattern does not capture the description because [ \t]{2,} requires two whitespace characters even though one tab spans several display columns. descriptionColumn consequently remains null, so a wrapped line beginning with --env-file=PATH is treated as the next option and the repeatability phrase remains undiscovered—the exact regression this lookahead is intended to fix. Handle tab-stop separators in this shared parser rather than adding a tool-specific exception.
AGENTS.md reference: AGENTS.md:L168-L172
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System.Collections.Hashtable[PRRT_kwDOJmSsds6fob_m]
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(Correcting an earlier reply that was posted as a raw hashtable string by a scripting bug.) Fixed in 01eed66: the row is split on runs of two or more blanks or a single tab (InlineSegmentSeparatorPattern), so a tab-aligned row resolves to the tab-expanded prose column and the wrapped --env-file=PATH line stays in the block; Repeatable_Lookahead_Accepts_A_Single_Tab_As_The_Description_Separator pins it.
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Inline comments:
In
`@tools/ModularPipelines.OptionsGenerator/src/ModularPipelines.OptionsGenerator/Scrapers/Cli/CliScraperBase.cs`:
- Around line 1424-1425: The InlineDescriptionPattern must skip the option
switches and any value hint before locating the description separator, so
GetDescriptionColumn captures only the actual description rather than the
value-hint column. Update InlineDescriptionPattern accordingly and add a
regression test covering multiple spaces before a value hint, preserving correct
repeatability detection in HelpDeclaresRepeatableOption.
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Review: #4664 — keep repeatable lookahead on wrapped option-looking linesSolid, narrowly-scoped fix with a good regression test ( Blocking:
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Review: #4664 — keep repeatable lookahead on wrapped option-looking linesThe core fix is a clean generalization: reusing `IsContinuationLine` (now with a nullable indentation floor) instead of unconditionally stopping the repeatable-option scan at any option-row-looking line matches the existing `AccumulateWrappedDescription` pattern well, and the new regression test (`Repeatable_Phrase_On_A_Wrapped_Option_Looking_Line_Is_Found`) exercises the exact scenario from the linked issue. However, this PR's HEAD commit (`178348153b`) already carries an earlier automated review on this exact same commit that flagged a real, still-unaddressed bug, and I independently traced through the code and confirmed it: Blocking:
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…rators The repeatable lookahead anchored its description column on the first run of two blanks, so a padded value hint or a second switch form became the column and a single tab was not a separator at all. Walk the row's segments instead: split on two or more blanks or one tab, skip switch segments and single-token value hints that are followed by more text, and take the first prose segment. Covers padded hints, shellcheck-style dual switch forms and tab-aligned help, with lookahead regressions for a nested option row at the hint column and for tab-separated blocks. Refs #4655 Claude-Session: https://claude.ai/code/session_01PkLNTUfwGXjqXZrYrHaDGC
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Addressed the blocking finding and both threads in 01eed66: |
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Review: #4664 — keep repeatable lookahead on wrapped option-looking linesThis is the follow-up commit ( That regex is now gone.
I also re-verified Both previously-flagged blocking findings are resolved, and the new tests pin down exactly the shapes that broke last time so they can't regress silently. No further issues found. |
Review: #4664 — keep repeatable lookahead on wrapped option-looking linesThis revision replaces the previously-flagged I traced this by hand against every case in the new tests and against the exact Shellcheck-style fixture (
This fully addresses both prior automated reviews on this PR, which blocked on the lazy-quantifier bug in No remaining issues found. The change is appropriately scoped to the generator/scraper (per this repo's CLAUDE.md, generated option output itself is untouched) and the fix is generic rather than tool-specific. |
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| { | ||
| var (start, text) = segments[i]; | ||
| var isSwitch = text.Length == 0 || text[0] == '-'; | ||
| var isValueHint = i < segments.Count - 1 && !text.Any(char.IsWhiteSpace); |
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When help places a value hint in its own padded column but starts the description on the following line, such as --env stringArray, the i < segments.Count - 1 condition makes the final stringArray segment appear to be prose, contradicting this helper's nullable contract. HelpDeclaresRepeatableOption then uses the hint column as the continuation threshold, so a nested option row indented to that column can be absorbed and lend its “may be specified multiple times” text to the preceding scalar option, producing an incorrect collection or a validation failure. Parse the terminal segment against the option/value grammar instead of assuming it is a description.
AGENTS.md reference: AGENTS.md:L168-L172
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Fixed in d2eeb77: single-token segments are now classified by shape wherever they sit (LooksLikeValueHint: one token that is not a sentence-case word), so a terminal stringArray is a hint and the column stays unknown until prose appears, while a one-word description such as Verbose remains prose. Repeatable_Lookahead_Does_Not_Anchor_On_A_Terminal_Value_Hint reproduces the nested --env-file row at the hint column and asserts --env stays scalar.
A row such as "--env stringArray" whose description only starts on the next line made the last segment count as prose, so the hint column became the continuation threshold and a nested option row at that column was absorbed. Classify every single-token segment by shape instead: one token that is not a sentence-case word is a value hint wherever it sits, while a one-word description such as "Verbose" stays prose. Refs #4655 Claude-Session: https://claude.ai/code/session_01PkLNTUfwGXjqXZrYrHaDGC
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| private static bool LooksLikeValueHint(string text) => | ||
| !text.Any(char.IsWhiteSpace) | ||
| && !(char.IsUpper(text[0]) && text.Length > 1 && char.IsLower(text[1])); |
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When help uses a TitleCase metavariable such as --env String Set environment variables, LooksLikeValueHint("String") returns false, so the value-hint column is mistaken for the description column. An actual nested option row indented between String and Set is then absorbed into --env's block and can lend it a “specified multiple times” phrase, incorrectly marking the outer scalar as repeatable or failing option-shape validation. Fresh evidence after the prior terminal-hint fix is the explicit Upper+lower exception here, which still classifies common String, Path, or File hints as prose; recognize these as value grammar rather than sentence-case prose in this shared parser.
AGENTS.md reference: AGENTS.md:L168-L170
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Fixed in 5b60b11: the casing heuristic is gone. Every lone token in a row is now a value hint (String, Path, stringArray, <value>, PATH alike); a one-word description is only ever misread when something wraps beneath the row, and in that case the lookahead takes its column from the wrapped line (added in 0c4ab69). Repeatable_Lookahead_Treats_A_TitleCase_Value_Hint_As_A_Hint covers --env String Set ... with a nested row between the hint and the prose column.
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With #4658 an unknown description column accepts any deeper line, so the repeatable lookahead absorbed every following option row after a declaration without inline prose (argparse-style help) until the next blank line. Take the column from the first accepted wrapped line, as AccumulateWrappedDescription already does, and make the terminal-hint regression realistic: prose deep, nested option row shallow. Refs #4655 Claude-Session: https://claude.ai/code/session_01PkLNTUfwGXjqXZrYrHaDGC
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CI on d2eeb77 failed only in the merge with main: #4658 made an unknown description column permissive, so the repeatable lookahead absorbed every later option row after a declaration without inline prose (the Ansible fixture) and the terminal-hint test. 0c4ab69 merges main and infers the lookahead column from the first accepted wrapped line, as |
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| declarationIndentation: null, | ||
| descriptionColumn, | ||
| OptionLinePattern().IsMatch(lines[index + 1]))) |
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When an option row has no inline prose and is immediately followed by another option row at the same indentation, descriptionColumn is null and the null indentation floor makes IsContinuationLine accept that sibling as the first continuation. The loop then scans the sibling's description as part of the original option, so a phrase such as “may be specified multiple times” can incorrectly promote the original scalar option to a collection or trigger ValidateOptionShapes; reject a same-indent option-looking first line while still allowing genuinely wrapped, more deeply indented switch text.
AGENTS.md reference: AGENTS.md:L168-L170
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Fixed in 4481fe4: while the column is still unknown, option-looking candidates must sit deeper than the declaration (the floor is applied only to them, so gcloud-style same-indent prose notes are unaffected and deeper wrapped switch text still continues). Repeatable_Lookahead_Stops_A_Descriptionless_Option_At_Its_Sibling_Row covers --env stringArray directly followed by --env-file=PATH ... may be specified multiple times at the same indentation.
TitleCase metavariables such as String, Path or File slipped past the sentence-case rule and became the prose column. A single token can be a hint or a one-word description, but the difference only matters when something wraps beneath the row, and the lookahead now takes its column from that wrapped line, so classify every lone token as a hint and drop the casing heuristic. Refs #4655 Claude-Session: https://claude.ai/code/session_01PkLNTUfwGXjqXZrYrHaDGC
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| /// column unknown until that line establishes it. A one-word description is only misread | ||
| /// when something wraps beneath it, and then the wrapped line sets the column instead. | ||
| /// </summary> | ||
| private static bool LooksLikeValueHint(string text) => !text.Any(char.IsWhiteSpace); |
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When help places a multi-token metavariable in a padded value column, such as --point X Y Set the point, this returns false solely because the hint contains whitespace, so GetInlineDescriptionColumn mistakes X Y for prose and anchors the continuation boundary at the value column. An option row indented between that column and the real prose column can then be absorbed into --point's block and lend it a phrase such as “may be specified multiple times,” incorrectly generating a collection or failing shape validation. Fresh evidence beyond the previously fixed terminal-token case is that grammar-valid multi-token hints are still classified as prose; classify option/value grammar rather than whitespace alone.
AGENTS.md reference: AGENTS.md:L168-L170
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Disposition: a generic lookahead cannot tell a multi-token metavariable (X Y) from two-word prose without the tool's own grammar, and that grammar lives in each scraper's AccumulateWrappedDescription regex, not here. With 2f3fcff the residual error needs three things at once: a multi-token padded hint, a descriptionful row, and a nested option row indented between the hint and prose columns; a scraper with that layout should supply its repeatability via its own description parsing (this helper only runs when the scraper's description did not already say so). Tracking it as a known limitation in the method comment rather than adding a second layout heuristic.
…g row With no inline prose and no column yet, an option-looking line at the same indentation as the declaration was accepted as the first continuation, so the sibling's description was scanned as part of the original option. While the column is unknown, apply the declaration indentation as a floor to option-looking candidates only: siblings start the next option, wrapped switch text (indented deeper) still continues, and same-indent prose such as gcloud's repeatability notes is unaffected. Refs #4655 Claude-Session: https://claude.ai/code/session_01PkLNTUfwGXjqXZrYrHaDGC
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| /// column unknown until that line establishes it. A one-word description is only misread | ||
| /// when something wraps beneath it, and then the wrapped line sets the column instead. | ||
| /// </summary> | ||
| private static bool LooksLikeValueHint(string text) => !text.Any(char.IsWhiteSpace); |
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When an option has a one-word inline description and the next option row is indented further—for example, --parent Configure followed by --child value May be specified multiple times—this classifies Configure as a value hint and leaves descriptionColumn null. The new unknown-column path then accepts the deeper option row as the first continuation and attributes its repeatability phrase to --parent, incorrectly promoting the parent to a collection or triggering ValidateOptionShapes. Fresh evidence after the prior TitleCase discussion is the combination of this unconditional one-token rule with the newly added deeper-row acceptance; distinguish hints using the option/value grammar so the shared scraper retains the real prose column.
AGENTS.md reference: AGENTS.md:L168-L170
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Fixed in 2f3fcff: while the description column is unknown, any option-looking line now ends the block, so the deeper --child row is never absorbed into --parent (Repeatable_Lookahead_Never_Absorbs_An_Option_Row_While_The_Column_Is_Unknown). Plain prose beneath a descriptionless row still establishes the column, and option-looking wrapped text is only kept once the row's inline prose fixed the column, which is the #4655 case.
Review: #4664 — keep repeatable lookahead on wrapped option-looking linesThis PR has been through several rounds already (two earlier automated reviews blocked on the Found (and already fixed on top of this commit): descriptionless option can absorb a sibling rowAt
I then checked the PR's actual current head and found commit VerdictNo outstanding issues against the PR's true current state. The iterative fixes (patches 3-6) each closed a real, narrow edge case with a matching regression test, and the design converges on a coherent rule: bound the lookahead by blank lines, by option rows once a description column is known, and by declaration indentation for option-row candidates while it isn't. Nice use of tightly-targeted unit tests ( One process note for whoever reviews this next: the |
…column is unknown This lookahead does not know a tool's layout, so it cannot tell a one-word description from a value hint or a nested option row from wrapped switch text. Until the row's inline prose has fixed the description column, any option-looking line now ends the block (a sibling row, a nested row, or the neighbour of a one-word description alike) while plain prose beneath a descriptionless row still establishes the column. Wrapped prose that starts with a switch is still kept once the column is known, which is the case the issue is about. Refs #4655 Claude-Session: https://claude.ai/code/session_01PkLNTUfwGXjqXZrYrHaDGC
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Addressed the remaining Codex threads in 2f3fcff: the lookahead is conservative while the column is unknown (option-looking lines end the block until inline prose fixes the column); the multi-token-metavariable case is a documented limitation of the generic helper, which defers to each scraper's own description grammar. Full |
Review: #4664 — keep repeatable lookahead on wrapped option-looking linesThis PR has already been through seven automated review rounds (two blocking on the Independent trace of
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| if ((looksLikeOptionRow && descriptionColumn is null) | ||
| || !IsContinuationLine(candidate, declarationIndentation: null, descriptionColumn, looksLikeOptionRow)) |
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When a declaration has no inline prose and its description begins on the next line with a switch mention—for example, --env stringArray followed by an indented --env-file=PATH ... may be specified multiple times—descriptionColumn is null and this unconditional branch stops before scanning that line. If the scraper's parsed description omitted the wrapped prose, which is why this full-help lookahead is needed, HelpDeclaresRepeatableOption returns false and ValidateOptionShapes allows the documented repeatable option to remain scalar. This newly added conservative branch therefore reintroduces the wrapped-option regression for descriptionless rows; distinguish sibling declarations from wrapped prose rather than rejecting every option-looking first continuation.
AGENTS.md reference: AGENTS.md:L168-L170
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Fixed in a788068. Rather than guessing whether an option-looking first continuation is prose or a row, the lookahead now learns the tool's layout: GetLayoutDescriptionColumn takes the most common description column across the help text (each row's inline prose column, or the indentation of the plain prose beneath a descriptionless row) and a descriptionless row is seeded with it. In your example the other Go-style rows put descriptions at the shared column, so the wrapped --env-file=PATH ... may be specified multiple times line is at that column and stays in --env's block, while a sibling or nested row (shallower than the column) still ends it. The existing sibling/nested/terminal-hint regressions are unchanged; new tests: Repeatable_Lookahead_Borrows_The_Layout_Column_For_A_Descriptionless_Row and Layout_Description_Column_Is_The_Most_Common_Row_Column. Scrapers namespace (687 tests) green locally.
…iptionless rows A row with no inline prose left the description column unknown, so any option-looking first continuation ended the repeatable lookahead. That kept sibling and nested rows out of the block but also dropped wrapped prose that happens to open with a switch mention, hiding a documented repeatable option. The lookahead now learns the column the help text lays descriptions out at (the most common inline prose column, or the indentation of next-line prose beneath descriptionless rows) and seeds a descriptionless row with it. Prose at that column stays in the block; rows at a shallower indentation still end it. Refs #4655 Claude-Session: https://claude.ai/code/session_01PkLNTUfwGXjqXZrYrHaDGC
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| var optionPattern = $@"(?<![\w-]){Regex.Escape(switchName)}(?![\w-])"; | ||
| var lines = helpText.ReplaceLineEndings("\n").Split('\n'); | ||
| var layoutColumn = GetLayoutDescriptionColumn(lines); |
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When a help document contains independently aligned option sections and the target declaration has no inline prose, this whole-document mode can select the description column of another section. If the target's wrapped description begins with an option-looking token at a smaller local column, IsContinuationLine treats it as the next option, so its repeatability phrase is never scanned and the generator emits a scalar option; validation cannot catch this because it calls the same helper. Fresh evidence after the earlier unknown-column fix is this newly added global layoutColumn, which makes the column non-null before the target's local layout is examined; infer the fallback from the containing section or nearby rows instead.
AGENTS.md reference: AGENTS.md:L168-L170
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Review: #4664 — keep repeatable lookahead on wrapped option-looking linesThis PR has been through eight prior automated review rounds (two blocking on the What changed since the last CLEAR
I hand-traced this against all the new fixtures ( Non-blocking observations (not raising these as blocking; no fixture demonstrates a wrong result from either)
VerdictThe core fix is sound, well-motivated by the linked issue, and each of the eight iterative rounds closed a real edge case with a matching unit test in |
ReviewThis is a well-scoped, iterative fix to Blocking
private static bool LooksLikeValueHint(string text) => !text.Any(char.IsWhiteSpace);This only recognizes single-token hints ( Concrete failure, traced against the actual code:
I independently re-verified this by hand-tracing twice against the current Suggested fix direction: rather than patching Non-blocking (design notes, not regressions)
VerdictThe multi-token value-hint gap above is a genuine, reproducible correctness bug in the new lookahead logic (confirmed by independent hand-tracing), even though no current fixture exercises it. Recommend adding a |
LooksLikeValueHint only recognised single-token hints, so a two-word hint such as "KEY VALUE" read as prose and GetInlineDescriptionColumn anchored the description column on the hint. A sibling row indented between the hint and the real prose column then passed as wrapped continuation and could donate its repeatability note to the wrong option. A segment whose every token is placeholder-shaped (uppercase, bracketed, or an ellipsis) is now a hint as well; prose has lowercase words. Refs #4655 Claude-Session: https://claude.ai/code/session_01PkLNTUfwGXjqXZrYrHaDGC
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Addressed the blocking finding in 1547bd6: On the design notes:
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| var candidate = lines[index + 1]; | ||
| var looksLikeOptionRow = OptionLinePattern().IsMatch(candidate); | ||
| if ((looksLikeOptionRow && descriptionColumn is null) | ||
| || !IsContinuationLine(candidate, declarationIndentation: null, descriptionColumn, looksLikeOptionRow)) |
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When help nests a real child option at or to the right of the parent's description column, this call treats that row as continuation prose because IsContinuationLine accepts every option-looking line whose indentation is at least descriptionColumn. A repeatability phrase on the child is therefore scanned as part of the parent, so consumers such as the Cobra/NPM repeatability logic can promote the parent to a collection, while ValidateOptionShapes can reject otherwise valid scalar output. Distinguish actual nested declarations from wrapped switch mentions in this shared parser rather than relying solely on their column.
AGENTS.md reference: AGENTS.md:L168-L170
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Review: #4664 — keep repeatable lookahead on wrapped option-looking linesThis PR has been through nine prior automated review rounds on this thread (two blocking on the original I independently re-traced that fix rather than taking the prior "addressed" claim at face value:
I was not able to execute the test project directly in this sandbox (the No outstanding issues found against the current head. The design has converged on a coherent, generic rule (bound the lookahead by blank lines, by option rows once a description column is known or inferred from layout, and by declaration indentation only while it is unknown), consistent with the repo guidance to prefer generic scraper/generator fixes over tool-specific patches. The remaining design notes from earlier rounds (global scope of |
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Summary
CliScraperBase.HelpDeclaresRepeatableOptionre-scans help text for an option's row when the scraper's own description did not already say the value is repeatable. Its lookahead stopped at the first line matchingOptionLinePattern(), a third continuation rule besideIsContinuationLine/AccumulateWrappedDescription. A wrapped description line that starts with another option's switch (for example--env-file=PATH are merged; may be specified) ended the scan, so a repeatable phrase split across that wrap was never seen.IsContinuationLinerule. The block is still bounded only by blank lines and option rows, not by indentation, because gcloud places its "can be repeated" note at the flag column (Gcloud_Uses_Whole_Option_Block_For_Repeatabilitypins that); what changes is that an option-looking line at or after the row's description column is now recognised as wrapped prose instead of ending the block.IsContinuationLinetakes a nullabledeclarationIndentation;nullmeans "no indentation floor" so the lookahead states its intent instead of passing a sentinel. Existing callers pass the sameintvalues as before.InlineDescriptionPatternderives the inline description (text after the first run of two or more blanks following the switches and value hint). Its group-to-column step is shared withAccumulateWrappedDescriptionthrough a newGetDescriptionColumnhelper; rows whose description begins on the next line get no column, which keeps the conservative behaviour of the shared rule.ContinuationLineTestsgains a fixture where the repeatable phrase only appears on a wrapped line beginning with--flag; it fails onmainand passes here. The non-repeatable option sits above the repeatable one so the negative case also proves the block stops at the next option row.HelpDeclaresRepeatableOptionisprotected internalso the test can call it directly, matchingIsContinuationLine.The generator fingerprint changes, so the next Generate CLI Options run regenerates every tool from
main.Test plan
ContinuationLineTests(new case red before the change, green after)ModularPipelines.OptionsGenerator.Testsproject (1322 passed)dotnet format --verify-no-changes --severity infoon the two changed filesCloses #4655
https://claude.ai/code/session_01EHe9J8SumuZb2NBZxpGBzc
Summary by CodeRabbit
Bug Fixes
Tests