Fix parser: handle multi-line and edge case parsing

[JesseHerrick]

Fixes the issues raised in #19, but takes it a step further to fix all multi-line parsing issues. Also fixes issues with hover-docs and completions inside of a multi-line alias block.

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Note

Medium Risk
Touches core parsing/indexing and LSP resolution paths (aliases/uses/hover/completion/definition), so regressions could affect navigation and symbol indexing across many files, though changes are well-covered by new regression tests.

Overview
Improves Elixir parsing robustness by joining continued lines and multi-line directives (backslash continuations, unclosed brackets, and trailing-comma alias/use/import/require forms) while preserving original line numbers, and adds stronger skipping of sigils/strings/interpolations/char literals to avoid false refs/defs and heredoc mis-detection.

Enhances LSP behavior for multi-line alias brace blocks by detecting the parent module (ExtractAliasBlockParent) and using it to resolve modules for hover/definition/references and to offer module-segment completions inside alias Parent.{ ... }; also avoids completions after func()./var. where type info is unavailable. Adds support for parsing multi-line use opts, introduces a periodic background reindex, and bumps IndexVersion to invalidate old indexes.

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[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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[cursor]

Non-alias lines never break backward scan despite comment

Medium Severity

In ExtractAliasBlockParent, the backward scan at lines 204–211 has a comment saying "Any other statement means we've left the alias context" but the code just continues instead of returning ("", false). Both the blank-line branch and the non-blank non-alias branch do continue, so a non-alias statement (e.g., an import or assignment) between the alias block opener and the cursor won't stop the scan. The pre-check partially mitigates this for def/defp/defmodule, but other statements like import, require, or plain code won't break the backward scan, potentially causing a false positive match to an unrelated alias block further up.

 

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[cursor]

Stale dangling doc comment for removed function

Low Severity

There's an orphaned doc comment for looksLikeOptContinuation — a function that doesn't exist in this file. It appears the function was replaced by parser.LooksLikeKeywordOpt, but its doc comment was left behind as a floating comment block between ExtractUsesWithOpts and ParseKeywordModuleOpts.

 

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[JesseHerrick]

Closing because #22 includes these changes but is a better fix.