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Shopify / liquid Public

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Minor cleanups to #2056#2069

Draft

cpakman wants to merge 98 commits intomainShopify/liquid:mainfrom

liquid-perf-polishShopify/liquid:liquid-perf-polishCopy head branch name to clipboard

Conversation Commits98 (98)Checks Files changed

Draft

Minor cleanups to #2056#2069
cpakman wants to merge 98 commits intomainfrom
liquid-perf-polish

Commits

Commits on Apr 5, 2026

add quick benchmark script for autoresearch

tobi
authored and
cpakman
committed
replace FullToken regex with manual byte parsing in parse_for_document

tobi
authored and
cpakman
committed
replace VariableParser regex scan with manual byte parser in VariableLookup

tobi
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cpakman
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add auto/bench.sh: unit tests + liquid-spec + perf benchmark

tobi
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use getbyte instead of string indexing in whitespace_handler and create_variable

tobi
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cpakman
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use equal? for frozen array comparison in Lexer, skip whitespace with \s+

tobi
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cpakman
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avoid unnecessary strip allocation in Expression.parse, use byteslice for string literals

tobi
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cpakman
committed
short-circuit parse_number with first-byte check before regex

tobi
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cpakman
committed
fast-path String in render_obj_to_output, avoid Utils.to_s dispatch for common case

tobi
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cpakman
committed
fast-path variable_lookups: skip mutable string alloc when no dot/bracket follows

tobi
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use frozen EMPTY_ARRAY for Variable filters when no filters present

tobi
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fast-path simple variable parsing: skip Lexer/Parser for plain dot-separated lookups

tobi
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cpakman
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replace SIMPLE_VARIABLE regex with byte-level scanner to avoid MatchData

tobi
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fast-path simple if conditions: skip ExpressionsAndOperators scan for single conditions

tobi
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skip TagAttributes scan in for tag when no colon present

tobi
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fast-path render for filter-less variables: skip render method overhead

tobi
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cpakman
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unified fast-path Variable parsing: handle both plain lookups and filter chains without full Lexer pass for name

tobi
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expose expression_cache/string_scanner via attr_reader, skip regex in filter args without colon

tobi
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replace For tag Syntax regex with manual byte-level parser

tobi
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cpakman
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avoid empty array allocation in evaluate_filter_expressions for no-arg filters

tobi
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cpakman
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use getbyte dispatch instead of start_with? in parse_for_document

tobi
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cpakman
committed
return [tag_name, markup, newlines] from parse_tag_token: avoid 2 whitespace string allocs

tobi
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cpakman
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use frozen EMPTY_ARRAY for disabled_tags in Variable

tobi
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cpakman
committed
hoist write score check out of render loop: skip increment_write_score when no limits active

tobi
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cpakman
committed
skip filter arg splat for no-arg filters, trim render loop comments

tobi
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cpakman
committed
extend fast-path to handle quoted string literal variables (262 more fast-pathed)

tobi
authored and
cpakman
committed
autoresearch: add autoresearch.md/sh, increase benchmark warmup to 20 iterations

tobi
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cpakman
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split filter parsing: scan no-arg filters directly, only invoke Lexer when args present

tobi
authored and
cpakman
committed
add security constraint to autoresearch.md, fix strict mode gate

tobi
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cpakman
committed
autoresearch.md: add strategic direction toward single-pass scanner architecture

tobi
authored and
cpakman
committed
clean up filter parsing: Lexer fallback for args, no-arg fast scan stays

tobi
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cpakman
committed
avoid array allocation in parse_tag_token: return tag_name, store markup/newlines as class ivars

tobi
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cpakman
committed
replace WhitespaceOrNothing regex with byte-level blank_string? check

tobi
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cpakman
committed
update autoresearch.md progress log

tobi
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cpakman
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fast-path simple if truthiness: use byte scanner before SIMPLE_CONDITION regex

tobi
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cpakman
committed
add invoke_single fast path for no-arg filter invocation, avoids splat alloc

tobi
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fast-path find_variable: check top scope first before find_index

tobi
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cpakman
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add invoke_two fast path for single-arg filter invocation, avoids splat chain

tobi
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cpakman
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fast-path slice_collection: skip copy for full Array without offset/limit

tobi
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cpakman
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replace SIMPLE_CONDITION regex with manual byte parser in if/elsif lax_parse

tobi
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cpakman
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replace INTEGER_REGEX/FLOAT_REGEX with byte-level parse_number

tobi
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use frozen EMPTY_ARRAY/EMPTY_HASH for Context @filters/@disabled_tags

tobi
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cpakman
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optimize Context init: avoid unnecessary array wrapping for environments

tobi
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cpakman
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update autoresearch.sh: 3-run best-of, skip liquid-spec for speed

tobi
authored and
cpakman
committed
avoid allocating seen={} hash in Utils.to_s/inspect when not needed

tobi
authored and
cpakman
committed
fast-path VariableLookup init: skip scan_variable for simple identifier chains

tobi
authored and
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committed
add parse_simple to skip simple_lookup? check when caller validates

tobi
authored and
cpakman
committed
introduce Cursor class: centralize byte-level scanning for tag/variable/condition parsing

tobi
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remove dead BlockBody.parse_tag_token and If SIMPLE_CONDITION - now in Cursor

tobi
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committed
REVERTED: Cursor for For tag adds 148 allocs from scan_id/scan_fragment string creation\n\nResult: {"status":"discard","combined_µs":5049,"parse_us":3765,"render_us":1284,"allocations":29793,"parse…

tobi
authored and
cpakman
committed
Cursor: add skip_id, expect_id, skip_fragment for zero-alloc scanning

tobi
authored and
cpakman
committed
For tag: migrate lax_parse to Cursor with zero-alloc skip_id/expect_id

tobi
authored and
cpakman
committed
update autoresearch.md with full progress log

tobi
authored and
cpakman
committed
fix rubocop offenses: autocorrect style/layout violations

tobi
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committed
Fast-path single-arg filter parsing: handle quoted strings, numbers, identifiers without Lexer/Parser\n\nResult: {"status":"keep","combined_µs":4427,"parse_µs":3181,"render_µs":1246,"allocations":2…

tobi
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committed
Avoid expr_markup byteslice when name is entire markup string (no whitespace, no filters)\n\nResult: {"status":"keep","combined_µs":4277,"parse_µs":3057,"render_µs":1220,"allocations":27026}

tobi
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Extend fast-path filter parsing to handle comma-separated multi-arg filters (e.g. pluralize: 'item', 'items')\n\nResult: {"status":"keep","combined_µs":4266,"parse_µs":3032,"render_µs":1234,"alloca…

tobi
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Replace split+join in truncatewords with manual word scan — avoids array + string allocations\n\nResult: {"status":"keep","combined_µs":4280,"parse_µs":3009,"render_µs":1271,"allocations":26395}

tobi
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committed
Cache small integer to_s (0-999): avoids 267 Integer#to_s allocations per render cycle\n\nResult: {"status":"keep","combined_µs":4158,"parse_µs":2920,"render_µs":1238,"allocations":26128}

tobi
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cpakman
committed
Lazy Context init: defer StringScanner and @interrupts array allocation until needed\n\nResult: {"status":"keep","combined_µs":4299,"parse_µs":3057,"render_µs":1242,"allocations":26015}

tobi
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cpakman
committed
Cache block_delimiter strings per tag name — avoids repeated string interpolation\n\nResult: {"status":"keep","combined_µs":4372,"parse_µs":3127,"render_µs":1245,"allocations":25605}

tobi
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Lazy @changes hash in Registers — only allocate when a register is actually written\n\nResult: {"status":"keep","combined_µs":4287,"parse_µs":3059,"render_µs":1228,"allocations":25595}

tobi
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committed
Use EMPTY_ARRAY for empty static_environments in Context — avoids 60 array allocs per render cycle\n\nResult: {"status":"keep","combined_µs":4262,"parse_µs":3079,"render_µs":1183,"allocations":25535}

tobi
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Skip respond_to?(:context=) for primitive types in find_variable — avoids method lookup overhead\n\nResult: {"status":"keep","combined_µs":4207,"parse_µs":2943,"render_µs":1264,"allocations":25535}

tobi
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Skip find_index when only one scope in find_variable — go straight to environments\n\nResult: {"status":"keep","combined_µs":4323,"parse_µs":3055,"render_µs":1268,"allocations":25535}

tobi
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Fast return for primitive types in find_variable — skip to_liquid and respond_to?(:context=)\n\nResult: {"status":"keep","combined_µs":4225,"parse_µs":3009,"render_µs":1216,"allocations":25535}

tobi
authored and
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Skip to_liquid/context= for primitives in VariableLookup#evaluate\n\nResult: {"status":"keep","combined_µs":4334,"parse_µs":3062,"render_µs":1272,"allocations":25535}

tobi
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Fast-path Hash lookups in VariableLookup#evaluate — skip respond_to? checks for Hash objects\n\nResult: {"status":"keep","combined_µs":4110,"parse_µs":2922,"render_µs":1188,"allocations":25535}

tobi
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Replace manual byte-level scan_id/skip_id with regex — C-level StringScanner.scan is faster than Ruby-level byte scanning\n\nResult: {"status":"keep","combined_µs":4185,"parse_µs":2943,"render_µs":…

tobi
authored and
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committed
Replace manual byte-level scan_number with regex — cleaner code, same performance\n\nResult: {"status":"keep","combined_µs":4184,"parse_µs":2931,"render_µs":1253,"allocations":25535}

tobi
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Replace manual scan_fragment/scan_quoted_string_raw/skip_fragment with regex — cleaner, same/better perf\n\nResult: {"status":"keep","combined_µs":4132,"parse_µs":2890,"render_µs":1242,"allocations…

tobi
authored and
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committed
Replace manual scan_comparison_op with regex — cleaner and avoids byteslice allocation for op strings\n\nResult: {"status":"keep","combined_µs":4007,"parse_µs":2808,"render_µs":1199,"allocations":2…

tobi
authored and
cpakman
committed
Replace manual rest_blank? with regex skip + eos? check\n\nResult: {"status":"keep","combined_µs":4047,"parse_µs":2795,"render_µs":1252,"allocations":25535}

tobi
authored and
cpakman
committed
Replace manual scan_quoted_string with regex capture groups\n\nResult: {"status":"keep","combined_µs":4102,"parse_µs":2849,"render_µs":1253,"allocations":25535}

tobi
authored and
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committed
Replace manual scan_dotted_id with regex\n\nResult: {"status":"keep","combined_µs":4121,"parse_µs":2812,"render_µs":1309,"allocations":25535}

tobi
authored and
cpakman
committed
Minor cleanup: optimize expect_id with while loop and early return\n\nResult: {"status":"keep","combined_µs":4184,"parse_µs":2921,"render_µs":1263,"allocations":25535}

tobi
authored and
cpakman
committed
Skip to_liquid_value for String/Integer keys in VariableLookup — avoids respond_to? dispatch\n\nResult: {"status":"keep","combined_µs":4131,"parse_µs":2893,"render_µs":1238,"allocations":25535}

tobi
authored and
cpakman
committed
Replace manual blank_string? with regex match — cleaner code\n\nResult: {"status":"keep","combined_µs":4196,"parse_µs":3042,"render_µs":1154,"allocations":25535}

tobi
authored and
cpakman
committed
Cache no-arg filter tuples [name, EMPTY_ARRAY] — reuse frozen tuples across templates\n\nResult: {"status":"keep","combined_µs":4147,"parse_µs":2992,"render_µs":1155,"allocations":24881}

tobi
authored and
cpakman
committed
update autoresearch.md with current progress

tobi
authored and
cpakman
committed
Skip context.evaluate for String lookup keys in VariableLookup — avoids respond_to? dispatch\n\nResult: {"status":"keep","combined_µs":4103,"parse_µs":2881,"render_µs":1222,"allocations":24881}

tobi
authored and
cpakman
committed
Baseline: 3,818µs combined, 24,881 allocs\n\nResult: {"status":"keep","combined_µs":3818,"parse_µs":2722,"render_µs":1096,"allocations":24881}

tobi
authored and
cpakman
committed
Replace StringScanner tokenizer with String#byteindex — 12% faster parse, no regex overhead for delimiter finding\n\nResult: {"status":"keep","combined_µs":3556,"parse_µs":2388,"render_µs":1168,"al…

tobi
authored and
cpakman
committed
Confirmation run: byteindex tokenizer consistently 3,400-3,600µs\n\nResult: {"status":"keep","combined_µs":3464,"parse_µs":2335,"render_µs":1129,"allocations":24882}

tobi
authored and
cpakman
committed
Clean up tokenizer: remove unused StringScanner setup and regex constants\n\nResult: {"status":"keep","combined_µs":3490,"parse_µs":2331,"render_µs":1159,"allocations":24882}

tobi
authored and
cpakman
committed
parse_tag_token without StringScanner: pure byte ops avoid reset(token) overhead, -12% combined\n\nResult: {"status":"keep","combined_µs":3350,"parse_µs":2212,"render_µs":1138,"allocations":24882}

tobi
authored and
cpakman
committed
update autoresearch docs with current progress

tobi
authored and
cpakman
committed
Clean confirmation run: 3,314µs (-55% from main), stable\n\nResult: {"status":"keep","combined_µs":3314,"parse_µs":2203,"render_µs":1111,"allocations":24882}

tobi
authored and
cpakman
committed
Condition#evaluate: skip loop block for simple conditions (no child_relation) — saves 235 allocs\n\nResult: {"status":"keep","combined_µs":3445,"parse_µs":2284,"render_µs":1161,"allocations":24647}

tobi
authored and
cpakman
committed
Replace simple_lookup? byte scan with match? regex — 8x faster per call, cleaner code\n\nResult: {"status":"keep","combined_µs":3489,"parse_µs":2353,"render_µs":1136,"allocations":24647}

tobi
authored and
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committed
Inline to_liquid_value in If render — avoids one method dispatch per condition evaluation\n\nResult: {"status":"keep","combined_µs":3459,"parse_µs":2318,"render_µs":1141,"allocations":24647}

tobi
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committed
Replace @blocks.each with while loop in If render — avoids block proc allocation per render\n\nResult: {"status":"keep","combined_µs":3496,"parse_µs":2356,"render_µs":1140,"allocations":24530}

tobi
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cpakman
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update autoresearch experiment log

tobi
authored and
cpakman
committed
Fixes infinite loop in tokenizer on trailing stray '{'
cpakman
committed
Adds ByteTables, moves cursor load order, consolidates byte constants
cpakman
committed
Decomposes, extracts, and names the important concepts
cpakman
committed
Removes dead code, tightens idioms, adds clarifying comments
cpakman
committed
Improves performance on hot parse and render paths
cpakman
committed

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