heredocDelimiter, executionRegion and scanShell each carried one long character loop with every quote, escape, heredoc, case and scope rule inline, which is where the three complexity warnings came from. The delimiter reader now has skipDelimiterBlanks, delimiterEscape and readDelimiterWord; the $(...) walker dispatches to regionQuotedEnd, regionSubstitution, openRegionQuote, regionHeredocOperator, regionHeredocBodies, casePhaseStep and closeRegionParen; and the top-level scanner keeps its position and pending word on a scan object that scanQuotedChar, scanEscape, scanSubstitution, openQuote, scanOperator and scanRedirect advance.
Every budget.spend call keeps its amount and order, so the work quota tests still land in the same window. The module still has no requires and exports createBudget, scanShell and scanExpansions unchanged; a differential run of the old and new scanner over the hook test corpus plus 58k generated inputs produced identical commands, nested regions and spend totals.
Preserve original contributor history and all current-main assertions while bounding quote, heredoc, shell-option and deferred-scan handling.
Source-PR: https://github.com/affaan-m/ECC/pull/2965
Source-Parent: 5a878131de
Main-Parent: d3b8a3e908
Review-Manifest-SHA256: 5d23f47e60516b66733805aec0ebcd47f19265c964529fa0b1220c8aa6903add
Merge buildCommentMask into buildScanBoundaries so one pass owns comment mask and scan bounds.
Extract shell-scan primitives to scripts/hooks/lib/shell-scan.js; keep policy in the hook.
Use a sticky heredoc regex instead of copying the remaining input on every <<.
Replace the short-circuiting chain test with clean-leading sequences that exercise checkCommand advance.
Add quoted-executable non-leakage coverage for the scanEnd=length path.
Treat $'…' ANSI-C quoting as a quoted executable word.
Join unquoted backslash-newline for the flag scan and heredoc-line bound.
Co-Authored-By: grok (fleet lane) <noreply@fleet.local>
Co-authored-by: groy75 <groy75@users.noreply.github.com>
