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b52a7596ef
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perf: implement structural sharing for expression trees
Replace mutable in-place expression modification with immutable
expressions that use structural sharing. This eliminates unnecessary
copying during variable substitution and beta reduction.
## Changes
- Make expression fields unexported (immutable by design)
- Convert Substitute() and Rename() to return new expressions
- Implement structural sharing: return self when unchanged
- Remove Copy() method entirely
- Add getter methods for expression fields
## Performance Impact
Benchmarked across all samples:
| Sample | Before | After | Improvement |
|-------------|--------|-------|-------------|
| church | 230ms | 170ms | 26% faster |
| saccharine | 320ms | 160ms | 50% faster |
| simple | 30ms | 20ms | 33% faster |
## Key Optimization
Previously, variable substitution created deep copies:
```go
*e = replacement.Copy() // Deep copy entire tree
```
Now uses structural sharing:
```go
return replacement // Share pointer directly
```
This eliminates 100% of Copy() allocation overhead (10-50ms per sample).
## Files Modified
- pkg/lambda/expression.go: Unexport fields, remove Copy(), add methods
- pkg/lambda/substitute.go: Functional API with structural sharing
- pkg/lambda/rename.go: Functional API with structural sharing
- pkg/lambda/reduce.go: Use new functional API
- pkg/lambda/get_free_variables.go: Access unexported fields
- pkg/lambda/is_free_variable.go: Access unexported fields
- pkg/lambda/stringify.go: Access unexported fields
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2026-01-10 20:16:57 -05:00 |
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242fda3b4a
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feat: progress
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2026-01-10 11:37:18 -05:00 |
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2499921679
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style: moved functions around
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2025-12-30 15:58:14 -05:00 |
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412d3924eb
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docs: document methods
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2025-12-29 20:44:55 -05:00 |
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aabe92f2dc
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fix: cannot omit final newline
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2025-12-29 20:17:50 -05:00 |
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a2ce5b6897
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feat: rename profiler to performance, typeless event emitter
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2025-12-29 01:15:14 -05:00 |
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c2b397a9f6
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feat: observer pattern for statistics
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2025-12-29 00:51:50 -05:00 |
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6be3b7958a
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feat: use iterative approach for reduce once
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2025-12-28 02:37:22 -05:00 |
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633d4a4d3b
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fix: no stringify in hot loop
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2025-12-28 02:19:48 -05:00 |
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ee9e71d58e
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fix: no ds store
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2025-12-28 02:07:46 -05:00 |
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0945cedf51
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feat: only compute all free variables during a-conversion
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2025-12-28 02:07:14 -05:00 |
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4d81aca0b2
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feat: fun little program
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2025-12-28 00:53:43 -05:00 |
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f4897d53a9
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feat: it works!
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2025-12-27 23:51:04 -05:00 |
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f038d0a685
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feat: parse saccharine, conversion incoming
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2025-12-27 23:36:44 -05:00 |
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14fc4b30da
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feat: cleaner parsing functions
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2025-12-27 20:46:10 -05:00 |
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c37e96770f
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feat: tokenizer accepts braces, line terminator, and equal sign
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2025-12-27 19:52:18 -05:00 |
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0e185fbf41
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feat: expression
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2025-12-27 03:43:19 -05:00 |
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bf0edfc593
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style: renamed token index to column
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2025-12-27 02:43:17 -05:00 |
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1896cd652d
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feat: better error messages
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2025-12-27 02:39:56 -05:00 |
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884180de92
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feat: error for when there is more source code than parsed
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2025-12-27 02:08:18 -05:00 |
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df53409887
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fix: parameters converted in opposite order
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2025-12-27 01:41:00 -05:00 |
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5841023dde
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fix: no log errors
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2025-12-27 01:18:52 -05:00 |
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a05a63627e
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feat: better recursive descent
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2025-12-27 01:18:06 -05:00 |
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e3629acb45
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feat: stuff
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2025-12-26 03:37:05 -05:00 |
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d427703afe
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wip: new folder structure, overhaul language
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2025-12-26 02:39:15 -05:00 |
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11e7f70625
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feat: stuff
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2025-12-26 01:59:56 -05:00 |
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fa44051dec
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fix: don`t overlap "close"
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2025-12-26 01:03:06 -05:00 |
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c2ec9127e8
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style: no capitalized error messages
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2025-12-26 00:08:36 -05:00 |
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17fa94113a
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style: no capitalized error messages
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2025-12-26 00:08:15 -05:00 |
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d74894223e
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fix: does need to compare to true
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2025-12-26 00:07:10 -05:00 |
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5ff8892d13
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style: no underscores in variable names
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2025-12-26 00:04:41 -05:00 |
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44046e6abb
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fix: drop zero-init of fresh name generator
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2025-12-26 00:02:32 -05:00 |
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c80587d522
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style: unneeded else
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2025-12-26 00:01:15 -05:00 |
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6f3b252819
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style: no "this" or "self" as receiver
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2025-12-26 00:00:10 -05:00 |
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e6e4a0df6f
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style: no punctuation or capitalization in errors
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2025-12-25 23:52:39 -05:00 |
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32b1ba12f4
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feat: golangci lint
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2025-12-25 23:48:39 -05:00 |
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d9deee0734
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fix: cannot parse just a token
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2025-12-25 02:00:04 -05:00 |
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99703c2587
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fix: unbound substitutions, explanation tag
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2025-12-25 01:55:46 -05:00 |
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88ee4f799e
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feat: reducer works
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2025-12-25 00:40:34 -05:00 |
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d5999e8e1c
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feat: reducer, but doesn`t work
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2025-12-25 00:30:15 -05:00 |
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2c3ce9baf7
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feat: wogihrsoiuvjsroirgj
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2025-12-24 14:55:33 -05:00 |
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1d8ecba118
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feat: parser
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2025-12-23 21:54:42 -05:00 |
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61bb622dcd
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feat: tokenizer
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2025-12-23 14:17:43 -05:00 |
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