Add infra for inline tests

2 files changed, 136 insertions, 0 deletions

diff --git a/tools/Cargo.toml b/tools/Cargo.toml
index e46874929..8cbc2fc93 100644
--- a/tools/Cargo.toml
+++ b/tools/Cargo.toml
@@ -9,4 +9,6 @@ serde = "1.0.26"
 serde_derive = "1.0.26"
 file = "1.1.1"
 ron = "0.1.5"
+walkdir = "2"
+itertools = "0.7"
 libsyntax2 = { path = "../" }
diff --git a/tools/src/bin/collect-tests.rs b/tools/src/bin/collect-tests.rs
new file mode 100644
index 000000000..c54059e79
--- /dev/null
+++ b/tools/src/bin/collect-tests.rs
@@ -0,0 +1,134 @@
+extern crate file;
+extern crate walkdir;
+extern crate itertools;
+
+use walkdir::WalkDir;
+use itertools::Itertools;
+
+use std::path::{PathBuf, Path};
+use std::collections::HashSet;
+use std::fs;
+
+fn main() {
+    let verify = ::std::env::args().any(|arg| arg == "--verify");
+
+    let d = grammar_dir();
+    let tests = tests_from_dir(&d);
+    let existing = existing_tests();
+
+    for t in existing.difference(&tests) {
+        panic!("Test is deleted: {}\n{}", t.name, t.text);
+    }
+
+    let new_tests = tests.difference(&existing);
+    for (i, t) in new_tests.enumerate() {
+        if verify {
+            panic!("Inline test is not recorded: {}", t.name);
+        }
+
+        let name = format!("{:04}_{}.rs", existing.len() + i + 1, t.name);
+        println!("Creating {}", name);
+        let path = inline_tests_dir().join(name);
+        file::put_text(&path, &t.text).unwrap();
+    }
+}
+
+
+#[derive(Debug, Eq)]
+struct Test {
+    name: String,
+    text: String,
+}
+
+impl PartialEq for Test {
+    fn eq(&self, other: &Test) -> bool {
+        self.name.eq(&other.name)
+    }
+}
+
+impl ::std::hash::Hash for Test {
+    fn hash<H: ::std::hash::Hasher>(&self, state: &mut H) {
+        self.name.hash(state)
+    }
+}
+
+fn tests_from_dir(dir: &Path) -> HashSet<Test> {
+    let mut res = HashSet::new();
+    for entry in WalkDir::new(dir) {
+        let entry = entry.unwrap();
+        if !entry.file_type().is_file() {
+            continue
+        }
+        if entry.path().extension().unwrap_or_default() != "rs" {
+            continue
+        }
+        let text = file::get_text(entry.path())
+            .unwrap();
+
+        for test in collect_tests(&text) {
+            if let Some(old_test) = res.replace(test) {
+                panic!("Duplicate test: {}", old_test.name)
+            }
+        }
+    }
+    res
+}
+
+fn collect_tests(s: &str) -> Vec<Test> {
+    let mut res = vec![];
+    let prefix = "// ";
+    let comment_blocks = s.lines()
+        .map(str::trim_left)
+        .group_by(|line| line.starts_with(prefix));
+
+    for (is_comment, block) in comment_blocks.into_iter() {
+        if !is_comment {
+            continue;
+        }
+        let mut block = block.map(|line| &line[prefix.len()..]);
+        let first = block.next().unwrap();
+        if !first.starts_with("test ") {
+            continue
+        }
+        let name = first["test ".len()..].to_string();
+        let text: String = itertools::join(block.chain(::std::iter::once("")), "\n");
+        assert!(!text.trim().is_empty() && text.ends_with("\n"));
+        res.push(Test { name, text })
+    }
+    res
+}
+
+fn existing_tests() -> HashSet<Test> {
+    let mut res = HashSet::new();
+    for file in fs::read_dir(&inline_tests_dir()).unwrap() {
+        let file = file.unwrap();
+        let path = file.path();
+        if path.extension().unwrap_or_default() != "rs" {
+            continue
+        }
+        let name = path.file_name().unwrap().to_str().unwrap();
+        let name = name["0000_".len()..name.len() - 3].to_string();
+        let text = file::get_text(&path).unwrap();
+        res.insert(Test { name, text });
+    }
+    res
+}
+
+fn inline_tests_dir() -> PathBuf {
+    let res = base_dir().join("tests/data/parser/inline");
+    if !res.is_dir() {
+        fs::create_dir_all(&res).unwrap();
+    }
+    res
+}
+
+fn grammar_dir() -> PathBuf {
+    base_dir().join("src/parser/event_parser/grammar")
+}
+
+fn base_dir() -> PathBuf {
+    let dir = env!("CARGO_MANIFEST_DIR");
+    PathBuf::from(dir).parent().unwrap().to_owned()
+}
+
+