fastdiff is a re-implementation of difflib in pure Rust compiled to WebAssembly to speedup different language integrations:
To install fastdiff in Python, you just need to do:
pip install fastdiffAnd then, use it in Python like this:
from fastdiff import compare
str1 = 'hello\nwasm\n'
str2 = 'hello\npython\n'
print(compare(str1, str2))When comparing strings with 300 lines, the WebAssembly based approach is about 100 times faster than the pure Python approach.
---------------------------------------------------------------------------------------------- benchmark: 3 tests ---------------------------------------------------------------------------------------------
Name (time in ms) Min Max Mean StdDev Median IQR Outliers OPS Rounds Iterations
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
test_benchmark_content_native 47.0735 (1.0) 50.7082 (1.0) 47.4401 (1.0) 0.7944 (1.0) 47.1680 (1.0) 0.2133 (1.0) 2;2 21.0792 (1.0) 21 1
test_benchmark_compile_native 1,187.2395 (25.22) 1,305.0581 (25.74) 1,222.2197 (25.76) 48.3778 (60.90) 1,198.9380 (25.42) 51.4950 (241.44) 1;0 0.8182 (0.04) 5 1
test_benchmark_content_base 5,480.3568 (116.42) 5,623.0508 (110.89) 5,516.5008 (116.28) 60.7623 (76.49) 5,487.1852 (116.33) 57.0271 (267.38) 1;0 0.1813 (0.01) 5 1
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
For building the WebAssembly file, you need Rust and the wasm32 target.
# Install Rustup
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
# Add wasm32 target
rustup target add wasm32-unknown-unknown
And then, run:
make build
For testing in Python you can do:
make test_python