Add Path schema

Author: theory

schema/v2/path.schema.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://pgxn.org/meta/v2/path.schema.json",
+  "title": "Path",
+  "description": "A *Path* is a string with a relative file path that identifies a file in the Distribution. The path **MUST** be specified with Unix conventions.",
+  "type": "string",
+  "minLength": 2,
+  "pattern": "^(?:[^/\\\\]|\\\\\\\\)(?:[^\\\\]|\\\\\\\\)+$",
+  "$comment": "https://regex101.com/r/d49AVj",
+  "examples": [".git", "src/pair.c", "doc/pair.md"]
+}

tests/v2_schema_test.rs

@@ -10,7 +10,7 @@ use common::*;
 const SCHEMA_VERSION: u8 = 2;
 
 #[test]
-fn test_schema_v1() -> Result<(), Box<dyn Error>> {
+fn test_schema_v2() -> Result<(), Box<dyn Error>> {
     test_schema_version(SCHEMA_VERSION)
 }
 
@@ -57,3 +57,40 @@ fn test_v2_semver() -> Result<(), Box<dyn Error>> {
 
     Ok(())
 }
+
+#[test]
+fn test_v2_path() -> Result<(), Box<dyn Error>> {
+    // Load the schemas and compile the semver schema.
+    let mut compiler = new_compiler("schema/v2")?;
+    let mut schemas = Schemas::new();
+    let id = id_for(SCHEMA_VERSION, "path");
+    let idx = compiler.compile(&id, &mut schemas)?;
+
+    // Test valid relative paths.
+    for valid_path in [
+        json!("README.txt"),
+        json!(".git"),
+        json!("src/pair.c"),
+        json!(".github/workflows/"),
+    ] {
+        if let Err(e) = schemas.validate(&valid_path, idx) {
+            panic!("path {} failed: {e}", valid_path);
+        }
+    }
+
+    // Test invalid paths.
+    for invalid_path in [
+        json!("\\foo.md"),
+        json!("this\\and\\that.txt"),
+        json!("/absolute/path"),
+        // ECMA supports look-ahead, but the regex crate does not.
+        // https://github.com/santhosh-tekuri/boon/issues/19
+        // json!("../outside/path"),
+        // json!("thing/../other"),
+    ] {
+        if schemas.validate(&invalid_path, idx).is_ok() {
+            panic!("{} unexpectedly passed!", invalid_path)
+        }
+    }
+    Ok(())
+}