From ad48b765b60bfdd1e4d116a12df6a18fca087c19 Mon Sep 17 00:00:00 2001
From: Bert Belder <bertbelder@gmail.com>
Date: Mon, 12 Oct 2020 08:09:23 +0200
Subject: [PATCH] Create Rust crate for extracting import specifiers from
 source code

---
 service/import_scanner/.gitignore    |   2 +
 service/import_scanner/.rustfmt.toml |   4 +
 service/import_scanner/Cargo.lock    | 815 +++++++++++++++++++++++++++
 service/import_scanner/Cargo.toml    |  30 +
 service/import_scanner/src/lib.rs    | 251 +++++++++
 5 files changed, 1102 insertions(+)
 create mode 100644 service/import_scanner/.gitignore
 create mode 100644 service/import_scanner/.rustfmt.toml
 create mode 100644 service/import_scanner/Cargo.lock
 create mode 100644 service/import_scanner/Cargo.toml
 create mode 100644 service/import_scanner/src/lib.rs

diff --git a/service/import_scanner/.gitignore b/service/import_scanner/.gitignore
new file mode 100644
index 0000000..2e0ed6d
--- /dev/null
+++ b/service/import_scanner/.gitignore
@@ -0,0 +1,2 @@
+/.vscode
+/target
diff --git a/service/import_scanner/.rustfmt.toml b/service/import_scanner/.rustfmt.toml
new file mode 100644
index 0000000..8b888c2
--- /dev/null
+++ b/service/import_scanner/.rustfmt.toml
@@ -0,0 +1,4 @@
+# Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+max_width = 80
+tab_spaces = 2
+edition = "2018"
\ No newline at end of file
diff --git a/service/import_scanner/Cargo.lock b/service/import_scanner/Cargo.lock
new file mode 100644
index 0000000..7b9d954
--- /dev/null
+++ b/service/import_scanner/Cargo.lock
@@ -0,0 +1,815 @@
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+ "serde",
+ "swc_visit",
+ "unicode-width",
+]
+
+[[package]]
+name = "swc_ecma_ast"
+version = "0.32.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "35c4031fc0fbdf091100e504e00fc8e9cb4c7e85396d8f22813ef3c3bf1d735c"
+dependencies = [
+ "enum_kind",
+ "is-macro",
+ "num-bigint",
+ "serde",
+ "string_enum",
+ "swc_atoms",
+ "swc_common",
+]
+
+[[package]]
+name = "swc_ecma_parser"
+version = "0.38.0"
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+checksum = "cf2847e59f92d8e682bd3e0dabc9e9ab2d3d4148218ddabf508b483174982f37"
+dependencies = [
+ "either",
+ "enum_kind",
+ "fxhash",
+ "log",
+ "num-bigint",
+ "serde",
+ "smallvec",
+ "swc_atoms",
+ "swc_common",
+ "swc_ecma_ast",
+ "swc_ecma_parser_macros",
+ "swc_ecma_visit",
+ "unicode-xid",
+]
+
+[[package]]
+name = "swc_ecma_parser_macros"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8798810e2c79b884cf238bcb72b4bd12375121ee91724f1ceeb54b6e38a138e7"
+dependencies = [
+ "pmutil",
+ "proc-macro2",
+ "quote",
+ "swc_macros_common",
+ "syn",
+]
+
+[[package]]
+name = "swc_ecma_visit"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04a3c00c0a4ed846261e653fb4ae734bffd9a29795042f7d414a1e6f01b9c812"
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+ "num-bigint",
+ "swc_atoms",
+ "swc_common",
+ "swc_ecma_ast",
+ "swc_visit",
+]
+
+[[package]]
+name = "swc_ecmascript"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5866615c98d2252eb75d6986af0701570a0ca86ce3e6769c1e951f33c7eb7d10"
+dependencies = [
+ "swc_ecma_ast",
+ "swc_ecma_parser",
+ "swc_ecma_visit",
+]
+
+[[package]]
+name = "swc_macros_common"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "18a9f27d290938370597d363df9a77ba4be8e2bc99f32f69eb5245cdeed3c512"
+dependencies = [
+ "pmutil",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "swc_visit"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b95ece564c6d6bf980140cedd960697226098800f2de07dad6a140c2dbdcc742"
+dependencies = [
+ "either",
+ "swc_visit_macros",
+]
+
+[[package]]
+name = "swc_visit_macros"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59a75265aea70df7a405e2aafb104c976017fe9a54e7b770017d0583873a3cff"
+dependencies = [
+ "Inflector",
+ "pmutil",
+ "proc-macro2",
+ "quote",
+ "swc_macros_common",
+ "syn",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e03e57e4fcbfe7749842d53e24ccb9aa12b7252dbe5e91d2acad31834c8b8fdd"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "thread_local"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
+dependencies = [
+ "lazy_static",
+]
+
+[[package]]
+name = "unicode-width"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
+
+[[package]]
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+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
+[[package]]
+name = "wasi"
+version = "0.9.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
+
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.68"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ac64ead5ea5f05873d7c12b545865ca2b8d28adfc50a49b84770a3a97265d42"
+dependencies = [
+ "cfg-if",
+ "serde",
+ "serde_json",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.68"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f22b422e2a757c35a73774860af8e112bff612ce6cb604224e8e47641a9e4f68"
+dependencies = [
+ "bumpalo",
+ "lazy_static",
+ "log",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-futures"
+version = "0.4.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b7866cab0aa01de1edf8b5d7936938a7e397ee50ce24119aef3e1eaa3b6171da"
+dependencies = [
+ "cfg-if",
+ "js-sys",
+ "wasm-bindgen",
+ "web-sys",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.68"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6b13312a745c08c469f0b292dd2fcd6411dba5f7160f593da6ef69b64e407038"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.68"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f249f06ef7ee334cc3b8ff031bfc11ec99d00f34d86da7498396dc1e3b1498fe"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.68"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d649a3145108d7d3fbcde896a468d1bd636791823c9921135218ad89be08307"
+
+[[package]]
+name = "wasm-bindgen-test"
+version = "0.3.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34d1cdc8b98a557f24733d50a1199c4b0635e465eecba9c45b214544da197f64"
+dependencies = [
+ "console_error_panic_hook",
+ "js-sys",
+ "scoped-tls",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "wasm-bindgen-test-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-test-macro"
+version = "0.3.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8fb9c67be7439ee8ab1b7db502a49c05e51e2835b66796c705134d9b8e1a585"
+dependencies = [
+ "proc-macro2",
+ "quote",
+]
+
+[[package]]
+name = "web-sys"
+version = "0.3.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4bf6ef87ad7ae8008e15a355ce696bed26012b7caa21605188cfd8214ab51e2d"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
diff --git a/service/import_scanner/Cargo.toml b/service/import_scanner/Cargo.toml
new file mode 100644
index 0000000..8406a0e
--- /dev/null
+++ b/service/import_scanner/Cargo.toml
@@ -0,0 +1,30 @@
+[package]
+name = "import_scanner"
+version = "0.1.0"
+authors = ["Bert Belder <bertbelder@gmail.com>"]
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+swc_common = "0.10.3"
+swc_ecmascript = { version = "0.9.3", default-features = false, features = [
+  "parser",
+  "visit"
+] }
+serde = { version = "1.0.116", features = ["derive"] }
+serde_derive = "1.0.116"
+serde_json = { version = "1.0.58", features = ["preserve_order"] }
+wasm-bindgen = { version = "0.2.68", features = ["serde-serialize"] }
+
+[dev-dependencies]
+wasm-bindgen-test = "0.3.18"
+
+[package.metadata.wasm-pack.profile.release]
+wasm-opt = ["-Oz", "--enable-mutable-globals"]
+
+[profile.release]
+lto = "fat"
+opt-level = "z"
+panic = "abort"
diff --git a/service/import_scanner/src/lib.rs b/service/import_scanner/src/lib.rs
new file mode 100644
index 0000000..922c5fe
--- /dev/null
+++ b/service/import_scanner/src/lib.rs
@@ -0,0 +1,251 @@
+use swc_common::{sync::Lrc, FileName, Loc, SourceMap, Span, DUMMY_SP};
+use swc_ecmascript::{
+  ast,
+  parser::{lexer::Lexer, EsConfig, PResult, Parser, StringInput, Syntax},
+  visit::{Node, Visit, VisitWith},
+};
+
+use serde::Serialize;
+use wasm_bindgen::prelude::*;
+
+#[serde(rename_all = "camelCase")]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Serialize)]
+pub enum ImportKind {
+  Import,
+  Export,
+}
+
+#[derive(Clone, Debug, Eq, PartialEq, Serialize)]
+pub struct ImportDescriptor {
+  pub specifier: String,
+  pub kind: ImportKind,
+  pub col: usize,
+  pub line: usize,
+}
+
+#[wasm_bindgen]
+pub fn get_imports(source: &[u8]) -> Box<[u8]> {
+  let source = String::from_utf8_lossy(source).into();
+  let imports = get_imports_impl(source).ok();
+  let json = serde_json::to_vec(&imports).unwrap();
+  json.into_boxed_slice()
+}
+
+#[inline(always)]
+fn get_imports_impl(source: String) -> PResult<Vec<ImportDescriptor>> {
+  let source_map = Lrc::<SourceMap>::default();
+  let source_file = source_map.new_source_file(FileName::Anon, source);
+  let lexer = Lexer::<StringInput<'_>>::new(
+    Syntax::Es(EsConfig {
+      jsx: true, // TODO: off?
+      num_sep: true,
+      class_private_props: true,
+      class_private_methods: true,
+      class_props: true,
+      fn_bind: true,
+      decorators: true,               // TODO: off?
+      decorators_before_export: true, // TODO: off?
+      export_default_from: true,
+      export_namespace_from: true,
+      dynamic_import: true,
+      nullish_coalescing: true,
+      optional_chaining: true,
+      import_meta: true,
+      top_level_await: true,
+      import_assertions: true,
+    }),
+    Default::default(),
+    (&*source_file).into(),
+    None,
+  );
+  let mut parser = Parser::new_from(lexer);
+  let module = parser.parse_module()?;
+  let mut visitor = ImportVisitor {
+    source_map: &source_map,
+    imports: vec![],
+  };
+  module.visit_with(&ast::Invalid { span: DUMMY_SP }, &mut visitor);
+  Ok(visitor.imports)
+}
+
+struct ImportVisitor<'a> {
+  pub imports: Vec<ImportDescriptor>,
+  source_map: &'a SourceMap,
+}
+
+impl<'a> ImportVisitor<'a> {
+  #[inline(always)]
+  fn get_location(&self, span: Span) -> (usize, usize) {
+    let Loc { line, col, .. } = self.source_map.lookup_char_pos(span.lo);
+    // Swc does not export any public module to convert a CharPos to a number.
+    let col: usize = unsafe { std::mem::transmute(col) };
+    (line, col)
+  }
+}
+
+impl<'a> Visit for ImportVisitor<'a> {
+  #[inline(always)]
+  fn visit_import_decl(&mut self, node: &ast::ImportDecl, _parent: &dyn Node) {
+    let specifier = node.src.value.to_string();
+    let (line, col) = self.get_location(node.span);
+    self.imports.push(ImportDescriptor {
+      specifier,
+      kind: ImportKind::Import,
+      line,
+      col,
+    });
+  }
+
+  #[inline(always)]
+  fn visit_named_export(
+    &mut self,
+    node: &ast::NamedExport,
+    _parent: &dyn Node,
+  ) {
+    if let Some(src) = &node.src {
+      let specifier = src.value.to_string();
+      let (line, col) = self.get_location(node.span);
+      self.imports.push(ImportDescriptor {
+        specifier,
+        kind: ImportKind::Export,
+        col,
+        line,
+      });
+    }
+  }
+
+  #[inline(always)]
+  fn visit_export_all(&mut self, node: &ast::ExportAll, _parent: &dyn Node) {
+    let specifier = node.src.value.to_string();
+    let (line, col) = self.get_location(node.span);
+    self.imports.push(ImportDescriptor {
+      specifier,
+      kind: ImportKind::Export,
+      line,
+      col,
+    });
+  }
+
+  #[inline(always)]
+  fn visit_stmts(&mut self, _imports: &[ast::Stmt], _parent: &dyn Node) {}
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+  use wasm_bindgen_test::*;
+
+  wasm_bindgen_test_configure!(run_in_browser);
+
+  #[test]
+  #[wasm_bindgen_test]
+  fn test_ok() {
+    let source = br#"
+import something from "../module_with_default_export.js";
+import { something_else } from "ordinary_module";
+import * as everything from "some_other_module.js";
+
+import "same_line_1"; import "same_line_2";
+
+import ""; // Empty specifier.
+
+await everything();
+
+import "after_top_level_await";
+
+export * from "complete re-exported module";
+export { that } from "partially re-exported module";
+
+import "repeated_import";
+import "repeated_import";
+
+/* padding */ import _ from "at column 14";
+"#;
+    let imports_json = serde_json::json!([
+      {
+        "specifier": "../module_with_default_export.js",
+        "kind": "import",
+        "col": 0,
+        "line": 2
+      },
+      {
+        "specifier": "ordinary_module",
+        "kind": "import",
+        "col": 0,
+        "line": 3
+      },
+      {
+        "specifier": "some_other_module.js",
+        "kind": "import",
+        "col": 0,
+        "line": 4
+      },
+      {
+        "specifier": "same_line_1",
+        "kind": "import",
+        "col": 0,
+        "line": 6
+      },
+      {
+        "specifier": "same_line_2",
+        "kind": "import",
+        "col": 22,
+        "line": 6
+      },
+      {
+        "specifier": "",
+        "kind": "import",
+        "col": 0,
+        "line": 8
+      },
+      {
+        "specifier": "after_top_level_await",
+        "kind": "import",
+        "col": 0,
+        "line": 12
+      },
+      {
+        "specifier": "complete re-exported module",
+        "kind": "export",
+        "col": 0,
+        "line": 14
+      },
+      {
+        "specifier": "partially re-exported module",
+        "kind": "export",
+        "col": 0,
+        "line": 15
+      },
+      {
+        "specifier": "repeated_import",
+        "kind": "import",
+        "col": 0,
+        "line": 17
+      },
+      {
+        "specifier": "repeated_import",
+        "kind": "import",
+        "col": 0,
+        "line": 18
+      },
+      {
+        "specifier": "at column 14",
+        "kind": "import",
+        "col": 14,
+        "line": 20
+      }
+    ]);
+    let actual = get_imports(source);
+    let expected = serde_json::to_vec(&imports_json)
+      .unwrap()
+      .into_boxed_slice();
+    assert_eq!(actual, expected);
+  }
+
+  #[test]
+  #[wasm_bindgen_test]
+  fn test_err() {
+    let r = get_imports(b"{;");
+    assert_eq!(r, b"null"[..].into());
+  }
+}