Create parsing test harness ⚡

1 files changed, 34 insertions, 0 deletions

diff --git a/build.rs b/build.rs
new file mode 100644
index 00000000..c91db8e0
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,34 @@
+use std::fs;
+use std::ffi::OsStr;
+
+fn main() {
+    println!("cargo:rerun-if-changed=build.rs");
+    println!("cargo:rerun-if-changed=tests/parsing");
+
+    fs::create_dir_all("tests/cache").unwrap();
+
+    let paths = fs::read_dir("tests/parsing").unwrap()
+        .map(|entry| entry.unwrap().path())
+        .filter(|path| path.extension() == Some(OsStr::new("rs")));
+
+    let mut code = "vec![".to_string();
+    for path in paths {
+        let name = path.file_stem().unwrap().to_str().unwrap();
+        let file = fs::read_to_string(&path).unwrap();
+
+        println!("cargo:rerun-if-changed=tests/parsing/{}.rs", name);
+
+        code.push_str(&format!("(\"{}\", tokens!{{", name));
+
+        for (index, line) in file.lines().enumerate() {
+            let mut line = line.replace("=>", &format!("=>({})=>", index + 1));
+            line.push('\n');
+            code.push_str(&line);
+        }
+
+        code.push_str("}),");
+    }
+    code.push(']');
+
+    fs::write("tests/cache/parsing.rs", code).unwrap();
+}