- compiled_template.rb: Use Liquid::Box for secure execution on Ruby 4.0+
- Creates box, loads runtime, locks, then evals template code
- Provides render() method and secure? check
- Falls back to insecure eval with warning on Ruby < 4.0
- ruby_compiler.rb: Remove inline helper generation
- Helpers now provided by pre-loaded LR module
- Generated code is much smaller (just control flow + LR calls)
- compile.rb: Update documentation for new security model
- template.rb: Update compile_to_ruby docs
The LR module provides all helper methods for compiled templates.
It is loaded into the sandbox BEFORE lock!, so helpers are defined
once and shared by all templates.
Helpers include:
- Type conversion: to_s, to_number, to_integer
- Output: output (handles nil, arrays, BigDecimal formatting)
- Lookup: lookup (hash/array access, Drop context support)
- Encoding: escape_html, url_encode/decode, base64_encode/decode
- Filters: truncate, truncatewords, slice, date, default, etc.
Method references to CGI, Base64, BigDecimal are captured at load
time, enabling safe use of these libraries within the sandbox.
Design principle: Maximize work in pre-loaded runtime, minimize
generated template code.
Introduces Liquid::Box which wraps Ruby 4.0's Ruby::Box for secure
template execution. On Ruby < 4.0, provides a polyfill with security
warnings.
Key features:
- Detects Ruby::Box availability at load time
- Loads safe libraries (CGI, Base64, BigDecimal) into sandbox
- Neuters dangerous methods (file IO, process control, eval, etc.)
- Preserves user constants defined before lock!
- Provides setup_gem_load_paths! to enable gem requires in box
Security model: It is safe to expose side-effect-free, non-IO methods
that don't leak objects with dangerous methods. The sandbox blocks
capabilities, not data.
Add explicit summary showing pre-compiled is X times FASTER,
and explain that "X slower" in comparison means relative to
the fastest option (pre-compiled Ruby). Higher i/s = faster.
- Create CompiledContext class that duck-types to Liquid::Context
- CompiledContext provides: variable lookup, registers, strict_* flags
- Update __lookup__ helper to:
- Set context on Drops BEFORE accessing their methods
- Call to_liquid on objects before lookup
- Set context on nested Drop results
- Change __lookup__ from def to lambda to capture __context__ closure
- Update expression compiler to use __lookup__.call() syntax
- Add CompiledTemplate.call options: registers, strict_variables, strict_filters
Tests added:
- test_compile_with_drop: Basic Drop property access
- test_compile_with_drop_context_access: Drop using context to access other vars
- test_compile_with_nested_drops: Chained Drop lookups
- test_compile_with_forloop_drop: Built-in forloop compatibility
- test_compile_with_registers: Drop accessing registers via context
All 51 tests pass, 30/30 benchmark templates produce matching output.
Use .inspect for all template/partial names inserted into generated
code strings to prevent code injection via maliciously crafted
template names like: {% render "foo'); system('rm -rf /'); #" %}
- Fix forloop.first/last/size lookups to try hash key before method call
- Fix tablerow cols parameter to use attributes['cols'] not @cols
- Fix tablerow output format to match interpreter (newlines, row boundaries)
- Fix capture compiler to access @body directly instead of iterating nodelist
- Add CompiledTemplate class to encapsulate code and external_tags
- Add external filter support via filter_handler
- Add debug mode warnings for external tag/filter calls
- Add Ruby 3.3 compatibility shim for peek_byte/scan_byte
- Add comprehensive unit tests for output equivalence
- Add benchmark comparing compiled vs interpreted rendering
All 30 test templates now produce identical output between compiled
Ruby and interpreted Liquid. Pre-compiled Ruby is 1.68x faster.
This adds a new `compile_to_ruby` method to Liquid::Template that compiles
Liquid templates to pure Ruby code. The compiled code can be eval'd to create
a proc that renders templates without needing the Liquid library at runtime.
## Features
- Compiles all standard Liquid tags: if/unless/case, for, assign, capture,
cycle, increment/decrement, raw, echo, break/continue, comment, tablerow
- Compiles variable expressions with filter chains to direct Ruby method calls
- Supports static partial inlining ({% render %} and {% include %} with string
literals are loaded and compiled at compile time)
- Dynamic partial support via runtime callbacks (__render_dynamic__, __include_dynamic__)
- Debug mode with source comments for error tracing (lightweight source map)
- SourceMapper utility to trace runtime errors back to Liquid source
## Optimization Opportunities
The compiled Ruby code has significant performance advantages:
1. No Context object - variables accessed directly from assigns hash
2. No filter invocation overhead - direct Ruby method calls
3. No resource limits tracking - no per-node render score updates
4. No stack-based scoping - uses Ruby's native block scoping
5. Direct string concatenation - no render_to_output_buffer abstraction
6. Native control flow - break/continue use Ruby's throw/catch
7. No to_liquid calls - values used directly
8. No profiling hooks - no profiler overhead
9. No exception rendering - errors propagate naturally
## Usage
```ruby
template = Liquid::Template.parse("Hello, {{ name }}!")
ruby_code = template.compile_to_ruby
render_proc = eval(ruby_code)
result = render_proc.call({ "name" => "World" })
# => "Hello, World!"
# With debug mode for error tracing:
ruby_code = template.compile_to_ruby(debug: true)
```
## Limitations
- Dynamic {% render %} and {% include %} require runtime callback methods
- Custom tags need explicit compiler implementations
- Custom filters must be available at runtime
* Make all array filters that use `filter_array` util process empty string and nil correctly
* up version
* fix ordering of checks
* also do it for map
* Do not raise property error
* Gracefully empty property in map filter
---------
Co-authored-by: Marco Concetto Rudilosso <[email protected]>
* Always stringify sum property.
* Add test
* always stringify properties in all array filters
* fix syntax error
* up version
---------
Co-authored-by: Dominic Petrick <[email protected]>
Tobi Lutke