Decomposes the 211-line try_fast_parse monolith in variable.rb into four
named private methods -- fast_scan_name, fast_resolve_name, fast_scan_filters,
fast_scan_filter_args -- and simplifies simple_variable_markup from a 55-line
byte scanner to a 10-line regex with fast pre-checks.
Generates invoke_single/invoke_two via module_eval in strainer_template.rb
and context.rb instead of duplicating near-identical method bodies. The two
arity variants differ only in parameter lists; generating them makes the
pattern explicit and eliminates copy-paste drift.
Extracts identical 4-line text-token handling block in block_body.rb into
private append_text_token(token, parse_context). The block appeared in
both the stray-{ fallback and the plain-text branch of parse_for_document.
Extracts accessible?(object, key) predicate from the 4-line inline ternary
in variable_lookup.rb that checked hash/array key presence; extracts
liquidize(object, context) from the duplicated to_liquid + context= wiring
that appeared in both the key-found and command-method branches.
Extracts find_in_envs(envs, key, raise_on_not_found:) from
try_variable_find_in_environments in context.rb, which looped over
@environments then @static_environments with identical loop bodies.
Adds 28 fast-path equivalence tests for Variable (variable_fast_parse_test.rb).
The stray-{ else branch in tokenize_fast had a nested while loop that could
exit via its condition (when next_open >= len) without advancing pos.
The outer while pos < len loop would then find the same { again forever.
Reproduced by: Liquid::Template.parse('a{') -- hangs indefinitely.
Replaces the nested scan loop with two String#byteindex calls to find the
next '{%' and '{{' directly, then takes the minimum. Always O(n), eliminates
the nested loop entirely, and impossible to leave pos stranded.
Adds regression tests covering the three inputs that previously hung
plus adjacent stray-brace cases.
Chris Pak