init project

Author: Brooooooklyn

.cargo/config

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+[target.x86_64-apple-darwin]
+rustflags = [
+  "-C", "link-arg=-undefined",
+  "-C", "link-arg=dynamic_lookup",
+]

.editorconfig

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+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_size = 2
+indent_style = space

.gitignore

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+/target
+**/*.rs.bk
+Cargo.lock

Cargo.toml

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+[package]
+name = "py-sourcemap"
+version = "0.1.0"
+authors = ["LongYinan <[email protected]>"]
+
+[lib]
+name = "py_sourcemap"
+crate-type = ["cdylib"]
+
+[dependencies]
+pyo3 = { version="0.4", features=["extension-module"] }
+source-map-mappings = { version="0.5" }

README.md

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+# py-sourcemap
+A tiny [source-map-mappings](https://github.com/fitzgen/source-map-mappings) bindings for python using [PyO3](https://github.com/PyO3/pyo3)

src/lib.rs

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+#![feature(specialization)]
+
+extern crate pyo3;
+extern crate source_map_mappings;
+
+use std::fs::File;
+use std::io::{BufReader, Read};
+
+use pyo3::prelude::*;
+use source_map_mappings::{Bias, Mappings, parse_mappings};
+
+#[pyclass]
+struct SourcemapParser {
+  parsed_map: Mappings<()>
+}
+
+#[pymethods]
+impl SourcemapParser {
+  #[new]
+  fn __new__(obj: &PyRawObject, path: &str) -> PyResult<()> {
+    let file = File::open(path).map_err(PyErr::from)?;
+    let mut buffers = vec![];
+    let mut reader = BufReader::new(file);
+    reader.read_to_end(&mut buffers).map_err(PyErr::from)?;
+    let mappings = parse_mappings(&buffers).map_err(|_| PyErr::new::<exc::TypeError, _>(format!("Parse Sourcemap failed: {}", path)))?;
+    obj.init(|_| SourcemapParser {
+      parsed_map: mappings,
+    })
+  }
+
+  fn original_location_for(&self, generated_line: u32, generated_column: u32) -> PyResult<(u32, u32)> {
+    if let Some(mapping) = self.parsed_map.original_location_for(generated_line, generated_column, Bias::LeastUpperBound) {
+      return Ok((mapping.generated_line, mapping.generated_column))
+    }
+    Err(PyErr::new::<exc::TypeError, _>("No sources found"))
+  }
+}
+
+#[pymodinit]
+fn py_sourcemap(_py: Python, m: &PyModule) -> PyResult<()> {
+  m.add_class::<SourcemapParser>()?;
+  Ok(())
+}