|
|
|
|
@ -8,7 +8,7 @@ mod tests;
|
|
|
|
|
|
|
|
|
|
use crate::syntax::ast::{ |
|
|
|
|
punc::Punctuator, |
|
|
|
|
token::{Token, TokenKind}, |
|
|
|
|
token::{NumericLiteral, Token, TokenKind}, |
|
|
|
|
}; |
|
|
|
|
use std::{ |
|
|
|
|
char::{decode_utf16, from_u32}, |
|
|
|
|
@ -18,6 +18,7 @@ use std::{
|
|
|
|
|
}; |
|
|
|
|
|
|
|
|
|
/// `vop` tests the next token to see if we're on an assign operation of just a plain binary operation.
|
|
|
|
|
///
|
|
|
|
|
/// If the next value is not an assignment operation it will pattern match the provided values and return the corresponding token.
|
|
|
|
|
macro_rules! vop { |
|
|
|
|
($this:ident, $assign_op:expr, $op:expr) => ({ |
|
|
|
|
@ -81,7 +82,7 @@ macro_rules! op {
|
|
|
|
|
/// [LexerError] implements [fmt::Display] so you just display this value as an error
|
|
|
|
|
#[derive(Debug, Clone)] |
|
|
|
|
pub struct LexerError { |
|
|
|
|
/// details will be displayed when a LexerError occurs
|
|
|
|
|
/// details will be displayed when a LexerError occurs.
|
|
|
|
|
details: String, |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
@ -113,7 +114,7 @@ impl error::Error for LexerError {
|
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
/// A lexical analyzer for JavaScript source code
|
|
|
|
|
/// A lexical analyzer for JavaScript source code.
|
|
|
|
|
#[derive(Debug)] |
|
|
|
|
pub struct Lexer<'a> { |
|
|
|
|
/// The list of tokens generated so far.
|
|
|
|
|
@ -131,9 +132,6 @@ pub struct Lexer<'a> {
|
|
|
|
|
impl<'a> Lexer<'a> { |
|
|
|
|
/// Returns a Lexer with a buffer inside
|
|
|
|
|
///
|
|
|
|
|
/// # Arguments
|
|
|
|
|
///
|
|
|
|
|
/// * `buffer` - A string slice that holds the source code.
|
|
|
|
|
/// The buffer needs to have a lifetime as long as the Lexer instance itself
|
|
|
|
|
pub fn new(buffer: &'a str) -> Lexer<'a> { |
|
|
|
|
Lexer { |
|
|
|
|
@ -208,23 +206,12 @@ impl<'a> Lexer<'a> {
|
|
|
|
|
result |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
/// Utility function for reading integers in different bases
|
|
|
|
|
fn read_integer_in_base(&mut self, base: u32, mut buf: String) -> Result<u64, LexerError> { |
|
|
|
|
self.next(); |
|
|
|
|
while let Some(ch) = self.preview_next() { |
|
|
|
|
if ch.is_digit(base) { |
|
|
|
|
buf.push(self.next()); |
|
|
|
|
} else { |
|
|
|
|
break; |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
u64::from_str_radix(&buf, base) |
|
|
|
|
.map_err(|_| LexerError::new("Could not convert value to u64")) |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
/// Utility function for checkint the NumericLiteral is not followed by an `IdentifierStart` or `DecimalDigit` character
|
|
|
|
|
/// Utility function for checkint the NumericLiteral is not followed by an `IdentifierStart` or `DecimalDigit` character.
|
|
|
|
|
///
|
|
|
|
|
/// More info [ECMAScript Specification](https://tc39.es/ecma262/#sec-literals-numeric-literals)
|
|
|
|
|
/// More information:
|
|
|
|
|
/// - [ECMAScript Specification][spec]
|
|
|
|
|
///
|
|
|
|
|
/// [spec]: https://tc39.es/ecma262/#sec-literals-numeric-literals
|
|
|
|
|
fn check_after_numeric_literal(&mut self) -> Result<(), LexerError> { |
|
|
|
|
match self.preview_next() { |
|
|
|
|
Some(ch) |
|
|
|
|
@ -237,6 +224,213 @@ impl<'a> Lexer<'a> {
|
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
/// Lexes a numerical literal.
|
|
|
|
|
///
|
|
|
|
|
/// More information:
|
|
|
|
|
/// - [ECMAScript Specification][spec]
|
|
|
|
|
///
|
|
|
|
|
/// [spec]: https://tc39.es/ecma262/#sec-literals-numeric-literals
|
|
|
|
|
fn reed_numerical_literal(&mut self, ch: char) -> Result<(), LexerError> { |
|
|
|
|
/// This is a helper structure
|
|
|
|
|
///
|
|
|
|
|
/// This structure helps with identifying what numerical type it is and what base is it.
|
|
|
|
|
enum NumericKind { |
|
|
|
|
Rational, |
|
|
|
|
Integer(u32), |
|
|
|
|
BigInt(u32), |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
impl NumericKind { |
|
|
|
|
/// Get the base of the number kind.
|
|
|
|
|
fn base(&self) -> u32 { |
|
|
|
|
match self { |
|
|
|
|
Self::Rational => 10, |
|
|
|
|
Self::Integer(ref base) => *base, |
|
|
|
|
Self::BigInt(ref base) => *base, |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
/// Converts `self` to BigInt kind.
|
|
|
|
|
fn convert_to_bigint(&mut self) { |
|
|
|
|
*self = match *self { |
|
|
|
|
Self::Rational => unreachable!("can not convert rational number to BigInt"), |
|
|
|
|
Self::Integer(base) => Self::BigInt(base), |
|
|
|
|
Self::BigInt(base) => Self::BigInt(base), |
|
|
|
|
}; |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
// TODO: Setup strict mode.
|
|
|
|
|
let strict_mode = false; |
|
|
|
|
|
|
|
|
|
let mut buf = ch.to_string(); |
|
|
|
|
let mut position_offset = 0; |
|
|
|
|
let mut kind = NumericKind::Integer(10); |
|
|
|
|
if ch == '0' { |
|
|
|
|
match self.preview_next() { |
|
|
|
|
None => { |
|
|
|
|
self.push_token(TokenKind::NumericLiteral(NumericLiteral::Integer(0))); |
|
|
|
|
self.column_number += 1; |
|
|
|
|
return Ok(()); |
|
|
|
|
} |
|
|
|
|
Some('x') | Some('X') => { |
|
|
|
|
self.next(); |
|
|
|
|
position_offset += 1; |
|
|
|
|
kind = NumericKind::Integer(16); |
|
|
|
|
} |
|
|
|
|
Some('o') | Some('O') => { |
|
|
|
|
self.next(); |
|
|
|
|
position_offset += 1; |
|
|
|
|
kind = NumericKind::Integer(8); |
|
|
|
|
} |
|
|
|
|
Some('b') | Some('B') => { |
|
|
|
|
self.next(); |
|
|
|
|
position_offset += 1; |
|
|
|
|
kind = NumericKind::Integer(2); |
|
|
|
|
} |
|
|
|
|
Some(ch) if ch.is_ascii_digit() => { |
|
|
|
|
let mut is_implicit_octal = true; |
|
|
|
|
while let Some(ch) = self.preview_next() { |
|
|
|
|
if !ch.is_ascii_digit() { |
|
|
|
|
break; |
|
|
|
|
} else if !ch.is_digit(8) { |
|
|
|
|
is_implicit_octal = false; |
|
|
|
|
} |
|
|
|
|
buf.push(self.next()); |
|
|
|
|
} |
|
|
|
|
if !strict_mode { |
|
|
|
|
if is_implicit_octal { |
|
|
|
|
kind = NumericKind::Integer(8); |
|
|
|
|
} |
|
|
|
|
} else { |
|
|
|
|
return Err(if is_implicit_octal { |
|
|
|
|
LexerError::new( |
|
|
|
|
"Implicit octal literals are not allowed in strict mode.", |
|
|
|
|
) |
|
|
|
|
} else { |
|
|
|
|
LexerError::new( |
|
|
|
|
"Decimals with leading zeros are not allowed in strict mode.", |
|
|
|
|
) |
|
|
|
|
}); |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
Some(_) => {} |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
while let Some(ch) = self.preview_next() { |
|
|
|
|
if !ch.is_digit(kind.base()) { |
|
|
|
|
break; |
|
|
|
|
} |
|
|
|
|
buf.push(self.next()); |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
if self.next_is('n') { |
|
|
|
|
kind.convert_to_bigint() |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
if let NumericKind::Integer(10) = kind { |
|
|
|
|
'digitloop: while let Some(ch) = self.preview_next() { |
|
|
|
|
match ch { |
|
|
|
|
'.' => loop { |
|
|
|
|
kind = NumericKind::Rational; |
|
|
|
|
buf.push(self.next()); |
|
|
|
|
|
|
|
|
|
let c = match self.preview_next() { |
|
|
|
|
Some(ch) => ch, |
|
|
|
|
None => break, |
|
|
|
|
}; |
|
|
|
|
|
|
|
|
|
match c { |
|
|
|
|
'e' | 'E' => { |
|
|
|
|
match self |
|
|
|
|
.preview_multiple_next(2) |
|
|
|
|
.unwrap_or_default() |
|
|
|
|
.to_digit(10) |
|
|
|
|
{ |
|
|
|
|
Some(0..=9) | None => { |
|
|
|
|
buf.push(self.next()); |
|
|
|
|
} |
|
|
|
|
_ => { |
|
|
|
|
break 'digitloop; |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
_ => { |
|
|
|
|
if !c.is_digit(10) { |
|
|
|
|
break 'digitloop; |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
}, |
|
|
|
|
'e' | 'E' => { |
|
|
|
|
kind = NumericKind::Rational; |
|
|
|
|
match self |
|
|
|
|
.preview_multiple_next(2) |
|
|
|
|
.unwrap_or_default() |
|
|
|
|
.to_digit(10) |
|
|
|
|
{ |
|
|
|
|
Some(0..=9) | None => { |
|
|
|
|
buf.push(self.next()); |
|
|
|
|
} |
|
|
|
|
_ => { |
|
|
|
|
break; |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
buf.push(self.next()); |
|
|
|
|
} |
|
|
|
|
'+' | '-' => { |
|
|
|
|
break; |
|
|
|
|
} |
|
|
|
|
_ if ch.is_digit(10) => { |
|
|
|
|
buf.push(self.next()); |
|
|
|
|
} |
|
|
|
|
_ => break, |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
if let Err(e) = self.check_after_numeric_literal() { |
|
|
|
|
return Err(e); |
|
|
|
|
}; |
|
|
|
|
|
|
|
|
|
let num = match kind { |
|
|
|
|
NumericKind::BigInt(_) => { |
|
|
|
|
// TODO: Implement bigint.
|
|
|
|
|
// NOTE: implementation goes here.
|
|
|
|
|
unimplemented!("BigInt"); |
|
|
|
|
} |
|
|
|
|
NumericKind::Rational /* base: 10 */ => { |
|
|
|
|
NumericLiteral::Rational( |
|
|
|
|
f64::from_str(&buf) |
|
|
|
|
.map_err(|_| LexerError::new("Could not convert value to f64"))?, |
|
|
|
|
) |
|
|
|
|
} |
|
|
|
|
NumericKind::Integer(base) => { |
|
|
|
|
if let Ok(num) = i32::from_str_radix(&buf, base) { |
|
|
|
|
NumericLiteral::Integer( |
|
|
|
|
num |
|
|
|
|
) |
|
|
|
|
} else { |
|
|
|
|
let b = f64::from(base); |
|
|
|
|
let mut result = 0.0_f64; |
|
|
|
|
for c in buf.chars() { |
|
|
|
|
let digit = f64::from(c.to_digit(base).unwrap()); |
|
|
|
|
result = result * b + digit; |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
NumericLiteral::Rational(result) |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
} |
|
|
|
|
}; |
|
|
|
|
|
|
|
|
|
self.push_token(TokenKind::NumericLiteral(num)); |
|
|
|
|
self.column_number += (buf.len() as u64) + position_offset - 1; |
|
|
|
|
|
|
|
|
|
Ok(()) |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
/// Runs the lexer until completion, returning a [LexerError] if there's a syntax issue, or an empty unit result
|
|
|
|
|
///
|
|
|
|
|
/// # Example
|
|
|
|
|
@ -383,117 +577,7 @@ impl<'a> Lexer<'a> {
|
|
|
|
|
// to compensate for the incrementing at the top
|
|
|
|
|
self.column_number += str_length.wrapping_add(1); |
|
|
|
|
} |
|
|
|
|
'0' => { |
|
|
|
|
let mut buf = String::new(); |
|
|
|
|
|
|
|
|
|
let num = match self.preview_next() { |
|
|
|
|
None => { |
|
|
|
|
self.push_token(TokenKind::NumericLiteral(0_f64)); |
|
|
|
|
return Ok(()); |
|
|
|
|
} |
|
|
|
|
Some('x') | Some('X') => { |
|
|
|
|
self.read_integer_in_base(16, buf)? as f64 |
|
|
|
|
} |
|
|
|
|
Some('o') | Some('O') => { |
|
|
|
|
self.read_integer_in_base(8, buf)? as f64 |
|
|
|
|
} |
|
|
|
|
Some('b') | Some('B') => { |
|
|
|
|
self.read_integer_in_base(2, buf)? as f64 |
|
|
|
|
} |
|
|
|
|
Some(ch) if (ch.is_ascii_digit() || ch == '.') => { |
|
|
|
|
// LEGACY OCTAL (ONLY FOR NON-STRICT MODE)
|
|
|
|
|
let mut gone_decimal = ch == '.'; |
|
|
|
|
while let Some(next_ch) = self.preview_next() { |
|
|
|
|
match next_ch { |
|
|
|
|
c if next_ch.is_digit(8) => { |
|
|
|
|
buf.push(c); |
|
|
|
|
self.next(); |
|
|
|
|
} |
|
|
|
|
'8' | '9' | '.' => { |
|
|
|
|
gone_decimal = true; |
|
|
|
|
buf.push(next_ch); |
|
|
|
|
self.next(); |
|
|
|
|
} |
|
|
|
|
_ => { |
|
|
|
|
break; |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
if gone_decimal { |
|
|
|
|
f64::from_str(&buf).map_err(|_e| LexerError::new("Could not convert value to f64"))? |
|
|
|
|
} else if buf.is_empty() { |
|
|
|
|
0.0 |
|
|
|
|
} else { |
|
|
|
|
(u64::from_str_radix(&buf, 8).map_err(|_e| LexerError::new("Could not convert value to u64"))?) as f64 |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
Some(_) => { |
|
|
|
|
0.0 |
|
|
|
|
} |
|
|
|
|
}; |
|
|
|
|
|
|
|
|
|
self.push_token(TokenKind::NumericLiteral(num)); |
|
|
|
|
|
|
|
|
|
//11.8.3
|
|
|
|
|
if let Err(e) = self.check_after_numeric_literal() { |
|
|
|
|
return Err(e) |
|
|
|
|
}; |
|
|
|
|
} |
|
|
|
|
_ if ch.is_digit(10) => { |
|
|
|
|
let mut buf = ch.to_string(); |
|
|
|
|
'digitloop: while let Some(ch) = self.preview_next() { |
|
|
|
|
match ch { |
|
|
|
|
'.' => loop { |
|
|
|
|
buf.push(self.next()); |
|
|
|
|
|
|
|
|
|
let c = match self.preview_next() { |
|
|
|
|
Some(ch) => ch, |
|
|
|
|
None => break, |
|
|
|
|
}; |
|
|
|
|
|
|
|
|
|
match c { |
|
|
|
|
'e' | 'E' => { |
|
|
|
|
match self.preview_multiple_next(2).unwrap_or_default().to_digit(10) { |
|
|
|
|
Some(0..=9) | None => { |
|
|
|
|
buf.push(self.next()); |
|
|
|
|
} |
|
|
|
|
_ => { |
|
|
|
|
break 'digitloop; |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
_ => { |
|
|
|
|
if !c.is_digit(10) { |
|
|
|
|
break 'digitloop; |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
}, |
|
|
|
|
'e' | 'E' => { |
|
|
|
|
match self.preview_multiple_next(2).unwrap_or_default().to_digit(10) { |
|
|
|
|
Some(0..=9) | None => { |
|
|
|
|
buf.push(self.next()); |
|
|
|
|
} |
|
|
|
|
_ => { |
|
|
|
|
break; |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
buf.push(self.next()); |
|
|
|
|
} |
|
|
|
|
'+' | '-' => { |
|
|
|
|
break; |
|
|
|
|
} |
|
|
|
|
_ if ch.is_digit(10) => { |
|
|
|
|
buf.push(self.next()); |
|
|
|
|
} |
|
|
|
|
_ => break, |
|
|
|
|
} |
|
|
|
|
} |
|
|
|
|
// TODO make this a bit more safe -------------------------------VVVV
|
|
|
|
|
self.push_token(TokenKind::NumericLiteral( |
|
|
|
|
f64::from_str(&buf).map_err(|_| LexerError::new("Could not convert value to f64"))?, |
|
|
|
|
)) |
|
|
|
|
} |
|
|
|
|
_ if ch.is_digit(10) => self.reed_numerical_literal(ch)?, |
|
|
|
|
_ if ch.is_alphabetic() || ch == '$' || ch == '_' => { |
|
|
|
|
let mut buf = ch.to_string(); |
|
|
|
|
while let Some(ch) = self.preview_next() { |
|
|
|
|
|
HalidOdat
4 years ago
committed by
GitHub