Use FileMap as an input.

ecmascript/Cargo.toml

@@ -7,5 +7,4 @@ authors = ["강동윤 <kdy1@outlook.kr>"]
 swc_ecma_ast = { path = "./ast" }
 swc_ecma_parser = { path = "./parser" }
 
-
 [dev-dependencies]

ecmascript/parser/src/lexer/input.rs

@@ -1,5 +1,5 @@
 use std::str;
-use swc_common::BytePos;
+use swc_common::{BytePos, FileMap};
 
 /// Used inside lexer.
 pub(super) struct LexerInput<I: Input> {
@@ -8,7 +8,7 @@ pub(super) struct LexerInput<I: Input> {
     input: I,
 }
 
-impl<'a, I: Input> LexerInput<I> {
+impl<I: Input> LexerInput<I> {
     pub const fn new(input: I) -> Self {
         LexerInput {
             input,
@@ -57,9 +57,37 @@ impl<'a, I: Input> LexerInput<I> {
 }
 
 #[derive(Debug, Clone)]
-pub struct CharIndices<'a>(pub str::CharIndices<'a>);
+pub struct FileMapInput<'a> {
+    fm: &'a FileMap,
+    start_pos: BytePos,
+    iter: str::CharIndices<'a>,
+}
 
-impl<'a> Input for CharIndices<'a> {
+impl<'a> From<&'a FileMap> for FileMapInput<'a> {
+    fn from(fm: &'a FileMap) -> Self {
+        let src = match fm.src {
+            Some(ref s) => s,
+            None => unreachable!("Cannot lex filemap without source: {}", fm.name),
+        };
+
+        FileMapInput {
+            start_pos: fm.start_pos,
+            iter: src.char_indices(),
+            fm,
+        }
+    }
+}
+
+impl<'a> Iterator for FileMapInput<'a> {
+    type Item = (BytePos, char);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter
+            .next()
+            .map(|(i, c)| (BytePos(i as u32 + self.start_pos.0), c))
+    }
+}
+impl<'a> Input for FileMapInput<'a> {
     fn peek(&mut self) -> Option<(BytePos, char)> {
         self.clone().nth(0)
     }
@@ -75,13 +103,6 @@ impl<'a> Input for CharIndices<'a> {
         None
     }
 }
-impl<'a> Iterator for CharIndices<'a> {
-    type Item = (BytePos, char);
-
-    fn next(&mut self) -> Option<Self::Item> {
-        self.0.next().map(|(i, c)| (BytePos(i as _), c))
-    }
-}
 
 pub trait Input: Iterator<Item = (BytePos, char)> {
     fn peek(&mut self) -> Option<(BytePos, char)>;
@@ -94,23 +115,3 @@ pub trait Input: Iterator<Item = (BytePos, char)> {
     where
         F: FnMut(char) -> bool;
 }
-
-impl<'a, I> Input for &'a mut I
-where
-    I: Input,
-{
-    fn peek(&mut self) -> Option<(BytePos, char)> {
-        <I as Input>::peek(*self)
-    }
-
-    fn peek_ahead(&mut self) -> Option<(BytePos, char)> {
-        <I as Input>::peek_ahead(*self)
-    }
-
-    fn uncons_while<F>(&mut self, f: F) -> Option<&str>
-    where
-        F: FnMut(char) -> bool,
-    {
-        <I as Input>::uncons_while(self, f)
-    }
-}

ecmascript/parser/src/lexer/number.rs

@@ -267,16 +267,16 @@ impl<'a, I: Input> Lexer<'a, I> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use lexer::input::CharIndices;
+    use super::input::FileMapInput;
     use std::f64::INFINITY;
     use std::panic;
 
     fn lex<F, Ret>(s: &'static str, f: F) -> Ret
     where
-        F: FnOnce(&mut Lexer<CharIndices>) -> Ret,
+        F: FnOnce(&mut Lexer<FileMapInput>) -> Ret,
     {
-        ::with_test_sess(s, |sess| {
-            let mut l = Lexer::new(sess, CharIndices(s.char_indices()));
+        ::with_test_sess(s, |sess, fm| {
+            let mut l = Lexer::new(sess, fm.into());
             f(&mut l)
         })
     }
@@ -369,9 +369,8 @@ mod tests {
                 .or_else(|_| case.parse::<f64>())
                 .expect("failed to parse `expected` as float using str.parse()");
 
-            let input = CharIndices(case.char_indices());
             let vec = panic::catch_unwind(|| {
-                ::with_test_sess(case, |mut sess| {
+                ::with_test_sess(case, |mut sess, input| {
                     sess.cfg.strict = strict;
                     Lexer::new(sess, input)
                         .map(|ts| ts.token)

ecmascript/parser/src/lexer/tests.rs

@@ -1,14 +1,14 @@
 use super::*;
-use super::input::CharIndices;
+use super::input::FileMapInput;
 use std::ops::Range;
 use std::str;
 
 fn with_lexer<F, Ret>(s: &'static str, f: F) -> Ret
 where
-    F: FnOnce(&mut Lexer<CharIndices>) -> Ret,
+    F: FnOnce(&mut Lexer<FileMapInput>) -> Ret,
 {
-    ::with_test_sess(s, |sess| {
-        let mut l = Lexer::new(sess, CharIndices(s.char_indices()));
+    ::with_test_sess(s, |sess, fm| {
+        let mut l = Lexer::new(sess, fm);
         f(&mut l)
     })
 }

ecmascript/parser/src/lib.rs

@@ -25,7 +25,7 @@ pub extern crate swc_macros;
 #[macro_use]
 extern crate testing;
 extern crate unicode_xid;
-pub use self::lexer::input::{CharIndices, Input};
+pub use self::lexer::input::{FileMapInput, Input};
 pub use self::parser::*;
 use slog::Logger;
 use swc_common::errors::Handler;
@@ -61,19 +61,30 @@ pub struct Session<'a> {
 #[cfg(test)]
 fn with_test_sess<F, Ret>(src: &'static str, f: F) -> Ret
 where
-    F: FnOnce(Session) -> Ret,
+    F: FnOnce(Session, FileMapInput) -> Ret,
 {
+    use std::rc::Rc;
+    use swc_common::FileName;
+    use swc_common::errors::{CodeMap, FilePathMapping};
+
+    let cm = Rc::new(CodeMap::new(FilePathMapping::empty()));
+    let fm = cm.new_filemap(FileName::Real("testing".into()), src.into());
+
     let handler = ::swc_common::errors::Handler::with_tty_emitter(
-        ::swc_common::errors::ColorConfig::Never,
+        ::swc_common::errors::ColorConfig::Auto,
         true,
         false,
-        None,
+        Some(cm),
     );
+
     let logger = ::testing::logger().new(o!("src" => src));
 
-    f(Session {
-        handler: &handler,
-        logger: &logger,
-        cfg: Default::default(),
-    })
+    f(
+        Session {
+            handler: &handler,
+            logger: &logger,
+            cfg: Default::default(),
+        },
+        (&*fm).into(),
+    )
 }

ecmascript/parser/src/parser/mod.rs

@@ -81,11 +81,9 @@ impl<'a, I: Input> Parser<'a, I> {
 }
 
 #[cfg(test)]
-fn test_parser<F, Ret>(s: &'static str, f: F) -> Ret
+pub fn test_parser<F, Ret>(s: &'static str, f: F) -> Ret
 where
-    F: FnOnce(&mut Parser<::CharIndices>) -> Ret,
+    F: FnOnce(&mut Parser<::FileMapInput>) -> Ret,
 {
-    ::with_test_sess(s, |session| {
-        f(&mut Parser::new(session, ::CharIndices(s.char_indices())))
-    })
+    ::with_test_sess(s, |sess, input| f(&mut Parser::new(sess, input)))
 }

ecmascript/parser/tests/test262.rs

@@ -16,11 +16,13 @@ use std::fs::read_dir;
 use std::io::{self, Read};
 use std::panic::{catch_unwind, resume_unwind};
 use std::path::Path;
+use std::rc::Rc;
 use swc_common::{FoldWith, Folder};
+use swc_common::FileName;
 use swc_common::Span;
+use swc_common::errors::{CodeMap, FilePathMapping};
 use swc_common::errors::Handler;
-
-use swc_ecma_parser::{CharIndices, PResult, Parser, Session};
+use swc_ecma_parser::{FileMapInput, PResult, Parser, Session};
 use swc_ecma_parser::ast::*;
 use test::{test_main, Options, TestDesc, TestDescAndFn, TestFn, TestName};
 use test::ShouldPanic::No;
@@ -179,19 +181,23 @@ fn logger(file_name: &str, src: &str) -> Logger {
 }
 
 struct TestSess {
+    cm: Rc<CodeMap>,
     handler: Handler,
     logger: Logger,
 }
 
 impl TestSess {
     fn new() -> Self {
+        let cm = Rc::new(CodeMap::new(FilePathMapping::empty()));
+
         let handler = ::swc_common::errors::Handler::with_tty_emitter(
             ::swc_common::errors::ColorConfig::Never,
             true,
             false,
-            None,
+            Some(cm.clone()),
         );
         TestSess {
+            cm,
             handler,
             logger: ::testing::logger(),
         }
@@ -205,16 +211,19 @@ impl TestSess {
 
     fn with_parser<'a, F, Ret>(&'a mut self, file_name: &str, src: &str, f: F) -> PResult<'a, Ret>
     where
-        F: FnOnce(&mut Parser<'a, CharIndices>) -> PResult<'a, Ret>,
+        F: FnOnce(&mut Parser<'a, FileMapInput>) -> PResult<'a, Ret>,
     {
         self.logger = logger(file_name, src);
+        let fm = self.cm
+            .new_filemap(FileName::Real(file_name.into()), src.into());
+
         f(&mut Parser::new(
             Session {
                 logger: &self.logger,
                 handler: &self.handler,
                 cfg: Default::default(),
             },
-            ::CharIndices(src.char_indices()),
+            (&*fm).into(),
         ))
     }
 }

swc/src/lib.rs

@@ -7,9 +7,9 @@ pub extern crate swc_macros;
 use slog::Logger;
 use std::path::Path;
 use std::rc::Rc;
-use swc_common::errors::{CodeMap, FilePathMapping, Handler};
+use swc_common::errors::{CodeMap, Handler};
 use swc_ecmascript::ast::Module;
-use swc_ecmascript::parser::{CharIndices, PResult, Parser, Session as ParseSess};
+use swc_ecmascript::parser::{FileMapInput, PResult, Parser, Session as ParseSess};
 
 pub struct Compiler {
     codemap: Rc<CodeMap>,
@@ -35,10 +35,9 @@ impl Compiler {
 
     /// TODO
     pub fn parse_js(&self, path: &Path) -> PResult<Module> {
-        let file = self.codemap
+        let fm = self.codemap
             .load_file_and_lines(path)
             .expect("failed to load file");
-        let src = file.src.clone().expect("we loaded this right before");
 
         Parser::new(
             ParseSess {
@@ -46,7 +45,7 @@ impl Compiler {
                 logger: &self.logger,
                 cfg: Default::default(),
             },
-            CharIndices(src.char_indices()),
+            FileMapInput::from(&*fm),
         ).parse_module()
     }
 }