Rename crates

common -> erg_common
compiler -> erg_compiler
parser -> erg_parser

src/erg_common/python_util.rs

@@ -0,0 +1,61 @@
+//! utilities for calling CPython.
+//!
+//! CPythonを呼び出すためのユーティリティー
+use std::process::Command;
+
+use crate::serialize::get_magic_num_from_bytes;
+
+pub fn which_python() -> String {
+    let python = if cfg!(windows) { "python" } else { "python3" };
+    let out = Command::new("which")
+        .arg(python)
+        .output()
+        .expect("python not found");
+    String::from_utf8(out.stdout)
+        .unwrap()
+        .replace("\n", "")
+        .replace("\r", "")
+}
+
+pub fn detect_magic_number() -> u32 {
+    let command = if cfg!(windows) { "cmd" } else { "sh" };
+    let arg = if cfg!(windows) { "/C" } else { "-c" };
+    let out = Command::new(command)
+        .arg(arg)
+        .arg(which_python())
+        .arg("-c")
+        .arg("import importlib.util as util;print(util.MAGIC_NUMBER.hex())")
+        .output()
+        .expect("cannot get the magic number from python");
+    let s_hex_magic_num = String::from_utf8(out.stdout).unwrap();
+    let first_byte = u8::from_str_radix(&s_hex_magic_num[0..=1], 16).unwrap();
+    let second_byte = u8::from_str_radix(&s_hex_magic_num[2..=3], 16).unwrap();
+    get_magic_num_from_bytes(&[first_byte, second_byte, 0, 0])
+}
+
+pub fn exec_pyc<S: Into<String>>(file: S) {
+    // executes over a shell, cause `python` may not exist as an executable file (like pyenv)
+    let command = if cfg!(windows) { "cmd" } else { "sh" };
+    let arg = if cfg!(windows) { "/C" } else { "-c" };
+    let mut out = Command::new(command)
+        .arg(arg)
+        .arg(which_python())
+        .arg(&file.into())
+        .spawn()
+        .expect("python not found");
+    out.wait().expect("python doesn't work");
+}
+
+pub fn eval_pyc<S: Into<String>>(file: S) -> String {
+    // executes over a shell, cause `python` may not exist as an executable file (like pyenv)
+    let command = if cfg!(windows) { "cmd" } else { "sh" };
+    let arg = if cfg!(windows) { "/C" } else { "-c" };
+    let out = Command::new(command)
+        .arg(arg)
+        .arg(which_python())
+        .arg(&file.into())
+        .spawn()
+        .expect("python not found");
+    let out = out.wait_with_output().expect("python doesn't work");
+    String::from_utf8(out.stdout).expect("failed to decode python output")
+}