better unicode escape support fixes #16 (#20)

* better unicode escape support fixes #16

* adding benchmarking, updating deps and added test for numbers

Cargo.lock

@@ -5,13 +5,37 @@ name = "Boa"
 version = "0.1.7"
 dependencies = [
  "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "criterion 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "gc 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "gc_derive 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasm-bindgen 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "arrayvec"
+version = "0.4.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "atty"
+version = "0.2.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termion 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "autocfg"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "bitflags"
 version = "1.0.4"
@@ -19,7 +43,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "bumpalo"
-version = "2.4.1"
+version = "2.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "byteorder"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "cast"
+version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -32,11 +66,21 @@ name = "chrono"
 version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-integer 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "clap"
+version = "2.33.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "cloudabi"
 version = "0.0.3"
@@ -45,6 +89,97 @@ dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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+ "cast 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "criterion-plot 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "csv 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_os 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_xoshiro 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon-core 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tinytemplate 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "memoffset 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-utils"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "csv-core 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ryu 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.91 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "csv-core"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "memchr 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "fuchsia-cprng"
 version = "0.1.1"
@@ -65,6 +200,14 @@ dependencies = [
  "synstructure 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "either 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "itoa"
 version = "0.4.4"
@@ -77,7 +220,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.54"
+version = "0.2.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -88,17 +231,52 @@ dependencies = [
  "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "memchr"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
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+version = "0.1.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "num-traits"
-version = "0.2.6"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "num_cpus"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "numtoa"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -129,7 +307,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -147,21 +325,103 @@ name = "rand_core"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "rand_os"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+ "either 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
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+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
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+[[package]]
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+]
+
 [[package]]
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+[[package]]
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+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
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+
+[[package]]
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+
 [[package]]
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 version = "1.0.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
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+version = "1.0.91"
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+dependencies = [
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "serde_json"
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@@ -209,16 +469,49 @@ dependencies = [
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 ]
 
+[[package]]
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+dependencies = [
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
+ "numtoa 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "textwrap"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
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+[[package]]
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+[[package]]
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+
 [[package]]
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@@ -229,52 +522,62 @@ name = "unicode-xid"
 version = "0.1.0"
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+[[package]]
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+ "wasm-bindgen-macro-support 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
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- "wasm-bindgen-backend 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-backend 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "wasm-bindgen-shared 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-shared 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
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Cargo.toml

@@ -17,6 +17,11 @@ serde_json = "1.0"
 rand = "0.5.5"
 chrono = "0.4"
 wasm-bindgen = "0.2.43"
+criterion = "0.2"
+
+[[bench]]
+name = "boa"
+harness = false
 
 [lib]
 crate-type = ["cdylib", "lib"]

benches/boa.rs

@@ -0,0 +1,17 @@
+#[macro_use]
+extern crate criterion;
+
+use boa::exec;
+use criterion::Criterion;
+
+fn hello_world() {
+    let s = &String::from("let a = 'hello world';");
+    exec(s.to_string());
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+    c.bench_function("hello_world", |b| b.iter(|| hello_world()));
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);

src/bin/bin.rs

@@ -4,5 +4,5 @@ use std::fs::read_to_string;
 
 pub fn main() {
     let buffer = read_to_string("tests/js/test.js").unwrap();
-    exec(buffer);
+    dbg!(exec(buffer));
 }

src/lib/lib.rs

@@ -24,21 +24,19 @@ extern "C" {
     fn log(s: &str);
 }
 
-pub fn exec(src: String) {
+pub fn exec(src: String) -> String {
     let mut lexer = Lexer::new(&src);
     lexer.lex().unwrap();
     let tokens = lexer.tokens;
-    // dbg!(&tokens);
 
     // Setup executor
     let expr = Parser::new(tokens).parse_all().unwrap();
-    print!("{:#?}", expr);
 
     let mut engine: Interpreter = Executor::new();
     let result = engine.run(&expr);
     match result {
-        Ok(v) => print!("{}", v),
+        Ok(v) => v.to_string(),
-        Err(v) => print!("Error: {}", v),
+        Err(v) => String::from(format!("{}: {}", "Error", v.to_string())),
     }
 }
 

src/lib/syntax/lexer.rs

@@ -4,7 +4,7 @@
 //! It also removes whitespace and comments and attaches them to the next token.
 use crate::syntax::ast::punc::Punctuator;
 use crate::syntax::ast::token::{Token, TokenData};
-use std::char::from_u32;
+use std::char::{decode_utf16, from_u32};
 use std::error;
 use std::fmt;
 use std::iter::Peekable;
@@ -169,6 +169,20 @@ impl<'a> Lexer<'a> {
         }
     }
 
+    /// Utility Function, while ``f(char)`` is true, read chars and move curser.
+    /// All chars are returned as a string
+    fn take_char_while<F>(&mut self, mut f: F) -> Result<String, LexerError>
+    where
+        F: FnMut(char) -> bool,
+    {
+        let mut s = String::new();
+        while self.buffer.peek().is_some() && f(self.preview_next()?) {
+            s.push(self.next()?);
+        }
+
+        Ok(s)
+    }
+
     /// next_is compares the character passed in to the next character, if they match true is returned and the buffer is incremented
     fn next_is(&mut self, peek: char) -> Result<bool, LexerError> {
         let result = self.preview_next()? == peek;
@@ -234,21 +248,60 @@ impl<'a> Lexer<'a> {
                                             }
                                         }
                                         'u' => {
-                                            let mut nums = String::new();
+                                            // There are 2 types of codepoints. Surragate codepoints and unicode codepoints.
-                                            for _ in 0u8..4 {
+                                            // UTF-16 could be surrogate codepoints, "\uXXXX\uXXXX" which make up a single unicode codepoint.
-                                                nums.push(self.next()?);
+                                            // We will need to loop to make sure we catch all UTF-16 codepoints
-                                            }
+                                            // Example Test: https://github.com/tc39/test262/blob/ee3715ee56744ccc8aeb22a921f442e98090b3c1/implementation-contributed/v8/mjsunit/es6/unicode-escapes.js#L39-L44
-                                            self.column_number += 4;
+
-                                            let as_num = match u64::from_str_radix(&nums, 16) {
+                                            // Support \u{X..X} (Unicode Codepoint)
+                                            if self.next_is('{')? {
+                                                let s = self
+                                                    .take_char_while(|c| c.is_alphanumeric())
+                                                    .unwrap();
+
+                                                // We know this is a single unicode codepoint, convert to u32
+                                                let as_num = match u32::from_str_radix(&s, 16) {
                                                     Ok(v) => v,
                                                     Err(_) => 0,
                                                 };
-                                            match from_u32(as_num as u32) {
+                                                let c = from_u32(as_num)
-                                                Some(v) => v,
+                                                    .expect("Invalid Unicode escape sequence");
-                                                None => panic!(
+
-                                                    "{}:{}: {} is not a valid unicode scalar value",
+                                                self.next()?; // '}'
-                                                    self.line_number, self.column_number, as_num
+                                                self.column_number += s.len() as u64 + 3;
-                                                ),
+                                                c
+                                            } else {
+                                                let mut codepoints: Vec<u16> = vec![];
+                                                loop {
+                                                    // Collect each character after \u e.g \uD83D will give "D83D"
+                                                    let s = self
+                                                        .take_char_while(|c| c.is_alphanumeric())
+                                                        .unwrap();
+
+                                                    // Convert to u16
+                                                    let as_num = match u16::from_str_radix(&s, 16) {
+                                                        Ok(v) => v,
+                                                        Err(_) => 0,
+                                                    };
+
+                                                    codepoints.push(as_num);
+                                                    self.column_number += s.len() as u64 + 2;
+
+                                                    // Check for another UTF-16 codepoint
+                                                    if self.next_is('\\')? && self.next_is('u')? {
+                                                        continue;
+                                                    }
+                                                    break;
+                                                }
+
+                                                // codepoints length should either be 1 (unicode codepoint) or 2 (surrogate codepoint).
+                                                // Rust's decode_utf16 will deal with it regardless
+                                                let c = decode_utf16(codepoints.iter().cloned())
+                                                    .next()
+                                                    .unwrap()
+                                                    .unwrap();
+
+                                                c
                                             }
                                         }
                                         '\'' | '"' => escape,
@@ -315,7 +368,11 @@ impl<'a> Lexer<'a> {
                 _ if ch.is_digit(10) => {
                     let mut buf = ch.to_string();
                     loop {
-                        let ch = self.preview_next()?;
+                        // There might not be a next character
+                        let ch = match self.preview_next() {
+                            Ok(c) => c,
+                            Err(_) => break,
+                        };
                         match ch {
                             '.' => {
                                 buf.push(self.next()?);
@@ -522,4 +579,23 @@ mod tests {
         );
     }
 
+    // TODO: Missing support for 5e3 5e+3 5e-3 0b10 0O123 0999 (octal notation)
+    #[test]
+    fn numbers() {
+        let mut lexer = Lexer::new("1 2 0x34 056 7.89;");
+        lexer.lex().expect("finished");
+        assert_eq!(lexer.tokens[0].data, TokenData::NumericLiteral(1.0));
+        assert_eq!(lexer.tokens[1].data, TokenData::NumericLiteral(2.0));
+        assert_eq!(lexer.tokens[2].data, TokenData::NumericLiteral(52.0));
+        assert_eq!(lexer.tokens[3].data, TokenData::NumericLiteral(46.0));
+        assert_eq!(lexer.tokens[4].data, TokenData::NumericLiteral(7.89));
+    }
+
+    #[test]
+    fn test_single_number_without_semicolon() {
+        let mut lexer = Lexer::new("1");
+        lexer.lex().expect("finished");
+        dbg!(lexer.tokens);
+    }
+
 }

tests/js/test.js

@@ -1,9 +1 @@
-function getConf() {
+let a = "hello world";
-  let jase = () => {
-    console.log("Hello");
-  };
-
-  jase();
-}
-
-getConf();