forked from M-Labs/nac3
1896 lines
64 KiB
Rust
1896 lines
64 KiB
Rust
//! This module takes care of lexing python source text.
|
|
//!
|
|
//! This means source code is translated into separate tokens.
|
|
|
|
pub use super::token::Tok;
|
|
use crate::ast::{Location, FileName};
|
|
use crate::error::{LexicalError, LexicalErrorType};
|
|
use std::char;
|
|
use std::cmp::Ordering;
|
|
use std::str::FromStr;
|
|
use std::num::IntErrorKind;
|
|
use unic_emoji_char::is_emoji_presentation;
|
|
use unic_ucd_ident::{is_xid_continue, is_xid_start};
|
|
|
|
#[derive(Clone, Copy, PartialEq, Debug, Default)]
|
|
struct IndentationLevel {
|
|
tabs: usize,
|
|
spaces: usize,
|
|
}
|
|
|
|
impl IndentationLevel {
|
|
fn compare_strict(
|
|
&self,
|
|
other: &IndentationLevel,
|
|
location: Location,
|
|
) -> Result<Ordering, LexicalError> {
|
|
// We only know for sure that we're smaller or bigger if tabs
|
|
// and spaces both differ in the same direction. Otherwise we're
|
|
// dependent on the size of tabs.
|
|
match self.tabs.cmp(&other.tabs) {
|
|
Ordering::Less => {
|
|
if self.spaces <= other.spaces {
|
|
Ok(Ordering::Less)
|
|
} else {
|
|
Err(LexicalError {
|
|
location,
|
|
error: LexicalErrorType::TabError,
|
|
})
|
|
}
|
|
}
|
|
Ordering::Greater => {
|
|
if self.spaces >= other.spaces {
|
|
Ok(Ordering::Greater)
|
|
} else {
|
|
Err(LexicalError {
|
|
location,
|
|
error: LexicalErrorType::TabError,
|
|
})
|
|
}
|
|
}
|
|
Ordering::Equal => Ok(self.spaces.cmp(&other.spaces)),
|
|
}
|
|
}
|
|
}
|
|
|
|
pub struct Lexer<T: Iterator<Item = char>> {
|
|
chars: T,
|
|
at_begin_of_line: bool,
|
|
nesting: usize, // Amount of parenthesis
|
|
indentation_stack: Vec<IndentationLevel>,
|
|
pending: Vec<Spanned>,
|
|
chr0: Option<char>,
|
|
chr1: Option<char>,
|
|
chr2: Option<char>,
|
|
location: Location,
|
|
config_comment_prefix: Option<&'static str>
|
|
}
|
|
|
|
pub static KEYWORDS: phf::Map<&'static str, Tok> = phf::phf_map! {
|
|
// Alphabetical keywords:
|
|
"..." => Tok::Ellipsis,
|
|
"False" => Tok::False,
|
|
"None" => Tok::None,
|
|
"True" => Tok::True,
|
|
|
|
"and" => Tok::And,
|
|
"as" => Tok::As,
|
|
"assert" => Tok::Assert,
|
|
"async" => Tok::Async,
|
|
"await" => Tok::Await,
|
|
"break" => Tok::Break,
|
|
"class" => Tok::Class,
|
|
"continue" => Tok::Continue,
|
|
"def" => Tok::Def,
|
|
"del" => Tok::Del,
|
|
"elif" => Tok::Elif,
|
|
"else" => Tok::Else,
|
|
"except" => Tok::Except,
|
|
"finally" => Tok::Finally,
|
|
"for" => Tok::For,
|
|
"from" => Tok::From,
|
|
"global" => Tok::Global,
|
|
"if" => Tok::If,
|
|
"import" => Tok::Import,
|
|
"in" => Tok::In,
|
|
"is" => Tok::Is,
|
|
"lambda" => Tok::Lambda,
|
|
"nonlocal" => Tok::Nonlocal,
|
|
"not" => Tok::Not,
|
|
"or" => Tok::Or,
|
|
"pass" => Tok::Pass,
|
|
"raise" => Tok::Raise,
|
|
"return" => Tok::Return,
|
|
"try" => Tok::Try,
|
|
"while" => Tok::While,
|
|
"with" => Tok::With,
|
|
"yield" => Tok::Yield,
|
|
};
|
|
|
|
pub type Spanned = (Location, Tok, Location);
|
|
pub type LexResult = Result<Spanned, LexicalError>;
|
|
|
|
#[inline]
|
|
pub fn make_tokenizer(source: &str, file: FileName) -> impl Iterator<Item = LexResult> + '_ {
|
|
make_tokenizer_located(source, Location::new(0, 0, file))
|
|
}
|
|
|
|
pub fn make_tokenizer_located(
|
|
source: &str,
|
|
start_location: Location,
|
|
) -> impl Iterator<Item = LexResult> + '_ {
|
|
let nlh = NewlineHandler::new(source.chars());
|
|
Lexer::new(nlh, start_location)
|
|
}
|
|
|
|
// The newline handler is an iterator which collapses different newline
|
|
// types into \n always.
|
|
pub struct NewlineHandler<T: Iterator<Item = char>> {
|
|
source: T,
|
|
chr0: Option<char>,
|
|
chr1: Option<char>,
|
|
}
|
|
|
|
impl<T> NewlineHandler<T>
|
|
where
|
|
T: Iterator<Item = char>,
|
|
{
|
|
pub fn new(source: T) -> Self {
|
|
let mut nlh = NewlineHandler {
|
|
source,
|
|
chr0: None,
|
|
chr1: None,
|
|
};
|
|
nlh.shift();
|
|
nlh.shift();
|
|
nlh
|
|
}
|
|
|
|
fn shift(&mut self) -> Option<char> {
|
|
let result = self.chr0;
|
|
self.chr0 = self.chr1;
|
|
self.chr1 = self.source.next();
|
|
result
|
|
}
|
|
}
|
|
|
|
impl<T> Iterator for NewlineHandler<T>
|
|
where
|
|
T: Iterator<Item = char>,
|
|
{
|
|
type Item = char;
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
// Collapse \r\n into \n
|
|
loop {
|
|
if self.chr0 == Some('\r') {
|
|
if self.chr1 == Some('\n') {
|
|
// Transform windows EOL into \n
|
|
self.shift();
|
|
} else {
|
|
// Transform MAC EOL into \n
|
|
self.chr0 = Some('\n')
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
self.shift()
|
|
}
|
|
}
|
|
|
|
impl<T> Lexer<T>
|
|
where
|
|
T: Iterator<Item = char>,
|
|
{
|
|
pub fn new(input: T, start: Location) -> Self {
|
|
let mut lxr = Lexer {
|
|
chars: input,
|
|
at_begin_of_line: true,
|
|
nesting: 0,
|
|
indentation_stack: vec![Default::default()],
|
|
pending: Vec::new(),
|
|
chr0: None,
|
|
location: start,
|
|
chr1: None,
|
|
chr2: None,
|
|
config_comment_prefix: Some(" nac3:")
|
|
};
|
|
lxr.next_char();
|
|
lxr.next_char();
|
|
lxr.next_char();
|
|
// Start at top row (=1) left column (=1)
|
|
lxr.location.reset();
|
|
lxr
|
|
}
|
|
|
|
// Lexer helper functions:
|
|
fn lex_identifier(&mut self) -> LexResult {
|
|
let mut name = String::new();
|
|
let start_pos = self.get_pos();
|
|
|
|
// Detect potential string like rb'' b'' f'' u'' r''
|
|
let mut saw_b = false;
|
|
let mut saw_r = false;
|
|
let mut saw_u = false;
|
|
let mut saw_f = false;
|
|
loop {
|
|
// Detect r"", f"", b"" and u""
|
|
if !(saw_b || saw_u || saw_f) && matches!(self.chr0, Some('b') | Some('B')) {
|
|
saw_b = true;
|
|
} else if !(saw_b || saw_r || saw_u || saw_f)
|
|
&& matches!(self.chr0, Some('u') | Some('U'))
|
|
{
|
|
saw_u = true;
|
|
} else if !(saw_r || saw_u) && (self.chr0 == Some('r') || self.chr0 == Some('R')) {
|
|
saw_r = true;
|
|
} else if !(saw_b || saw_u || saw_f)
|
|
&& (self.chr0 == Some('f') || self.chr0 == Some('F'))
|
|
{
|
|
saw_f = true;
|
|
} else {
|
|
break;
|
|
}
|
|
|
|
// Take up char into name:
|
|
name.push(self.next_char().unwrap());
|
|
|
|
// Check if we have a string:
|
|
if self.chr0 == Some('"') || self.chr0 == Some('\'') {
|
|
return self.lex_string(saw_b, saw_r, saw_u, saw_f);
|
|
}
|
|
}
|
|
|
|
while self.is_identifier_continuation() {
|
|
name.push(self.next_char().unwrap());
|
|
}
|
|
let end_pos = self.get_pos();
|
|
|
|
if let Some(tok) = KEYWORDS.get(name.as_str()) {
|
|
Ok((start_pos, tok.clone(), end_pos))
|
|
} else {
|
|
Ok((start_pos, Tok::Name { name: name.into() }, end_pos))
|
|
}
|
|
}
|
|
|
|
/// Numeric lexing. The feast can start!
|
|
fn lex_number(&mut self) -> LexResult {
|
|
let start_pos = self.get_pos();
|
|
if self.chr0 == Some('0') {
|
|
if self.chr1 == Some('x') || self.chr1 == Some('X') {
|
|
// Hex!
|
|
self.next_char();
|
|
self.next_char();
|
|
self.lex_number_radix(start_pos, 16)
|
|
} else if self.chr1 == Some('o') || self.chr1 == Some('O') {
|
|
// Octal style!
|
|
self.next_char();
|
|
self.next_char();
|
|
self.lex_number_radix(start_pos, 8)
|
|
} else if self.chr1 == Some('b') || self.chr1 == Some('B') {
|
|
// Binary!
|
|
self.next_char();
|
|
self.next_char();
|
|
self.lex_number_radix(start_pos, 2)
|
|
} else {
|
|
self.lex_normal_number()
|
|
}
|
|
} else {
|
|
self.lex_normal_number()
|
|
}
|
|
}
|
|
|
|
/// Lex a hex/octal/decimal/binary number without a decimal point.
|
|
fn lex_number_radix(&mut self, start_pos: Location, radix: u32) -> LexResult {
|
|
let value_text = self.radix_run(radix);
|
|
let end_pos = self.get_pos();
|
|
let value = match i128::from_str_radix(&value_text, radix) {
|
|
Ok(value) => value,
|
|
Err(e) => {
|
|
match e.kind() {
|
|
IntErrorKind::PosOverflow | IntErrorKind::NegOverflow => i128::MAX,
|
|
_ => return Err(LexicalError {
|
|
error: LexicalErrorType::OtherError(format!("{:?}", e)),
|
|
location: start_pos,
|
|
}),
|
|
}
|
|
}
|
|
};
|
|
Ok((start_pos, Tok::Int { value }, end_pos))
|
|
}
|
|
|
|
/// Lex a normal number, that is, no octal, hex or binary number.
|
|
fn lex_normal_number(&mut self) -> LexResult {
|
|
let start_pos = self.get_pos();
|
|
let start_is_zero = self.chr0 == Some('0');
|
|
// Normal number:
|
|
let mut value_text = self.radix_run(10);
|
|
|
|
// If float:
|
|
if self.chr0 == Some('.') || self.at_exponent() {
|
|
// Take '.':
|
|
if self.chr0 == Some('.') {
|
|
if self.chr1 == Some('_') {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::OtherError("Invalid Syntax".to_owned()),
|
|
location: self.get_pos(),
|
|
});
|
|
}
|
|
value_text.push(self.next_char().unwrap());
|
|
value_text.push_str(&self.radix_run(10));
|
|
}
|
|
|
|
// 1e6 for example:
|
|
if self.chr0 == Some('e') || self.chr0 == Some('E') {
|
|
value_text.push(self.next_char().unwrap().to_ascii_lowercase());
|
|
|
|
// Optional +/-
|
|
if self.chr0 == Some('-') || self.chr0 == Some('+') {
|
|
value_text.push(self.next_char().unwrap());
|
|
}
|
|
|
|
value_text.push_str(&self.radix_run(10));
|
|
}
|
|
|
|
let value = f64::from_str(&value_text).unwrap();
|
|
// Parse trailing 'j':
|
|
if self.chr0 == Some('j') || self.chr0 == Some('J') {
|
|
self.next_char();
|
|
let end_pos = self.get_pos();
|
|
Ok((
|
|
start_pos,
|
|
Tok::Complex {
|
|
real: 0.0,
|
|
imag: value,
|
|
},
|
|
end_pos,
|
|
))
|
|
} else {
|
|
let end_pos = self.get_pos();
|
|
Ok((start_pos, Tok::Float { value }, end_pos))
|
|
}
|
|
} else {
|
|
// Parse trailing 'j':
|
|
if self.chr0 == Some('j') || self.chr0 == Some('J') {
|
|
self.next_char();
|
|
let end_pos = self.get_pos();
|
|
let imag = f64::from_str(&value_text).unwrap();
|
|
Ok((start_pos, Tok::Complex { real: 0.0, imag }, end_pos))
|
|
} else {
|
|
let end_pos = self.get_pos();
|
|
// assumption: value_text contains a valid integer.
|
|
// parse should only fail because of overflow.
|
|
let value = value_text.parse::<i128>().ok();
|
|
let nonzero = match value {
|
|
Some(value) => value != 0i128,
|
|
None => true
|
|
};
|
|
if start_is_zero && nonzero {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::OtherError("Invalid Token".to_owned()),
|
|
location: self.get_pos(),
|
|
});
|
|
}
|
|
Ok((start_pos, Tok::Int { value: value.unwrap_or(i128::MAX) }, end_pos))
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Consume a sequence of numbers with the given radix,
|
|
/// the digits can be decorated with underscores
|
|
/// like this: '1_2_3_4' == '1234'
|
|
fn radix_run(&mut self, radix: u32) -> String {
|
|
let mut value_text = String::new();
|
|
|
|
loop {
|
|
if let Some(c) = self.take_number(radix) {
|
|
value_text.push(c);
|
|
} else if self.chr0 == Some('_') && Lexer::<T>::is_digit_of_radix(self.chr1, radix) {
|
|
self.next_char();
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
value_text
|
|
}
|
|
|
|
/// Consume a single character with the given radix.
|
|
fn take_number(&mut self, radix: u32) -> Option<char> {
|
|
let take_char = Lexer::<T>::is_digit_of_radix(self.chr0, radix);
|
|
|
|
if take_char {
|
|
Some(self.next_char().unwrap())
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
|
|
/// Test if a digit is of a certain radix.
|
|
fn is_digit_of_radix(c: Option<char>, radix: u32) -> bool {
|
|
match radix {
|
|
2 => matches!(c, Some('0'..='1')),
|
|
8 => matches!(c, Some('0'..='7')),
|
|
10 => matches!(c, Some('0'..='9')),
|
|
16 => matches!(c, Some('0'..='9') | Some('a'..='f') | Some('A'..='F')),
|
|
other => unimplemented!("Radix not implemented: {}", other),
|
|
}
|
|
}
|
|
|
|
/// Test if we face '[eE][-+]?[0-9]+'
|
|
fn at_exponent(&self) -> bool {
|
|
match self.chr0 {
|
|
Some('e') | Some('E') => match self.chr1 {
|
|
Some('+') | Some('-') => matches!(self.chr2, Some('0'..='9')),
|
|
Some('0'..='9') => true,
|
|
_ => false,
|
|
},
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
/// Skip everything until end of line, may produce nac3 pseudocomment
|
|
fn lex_comment(&mut self) -> Option<Spanned> {
|
|
self.next_char();
|
|
// if possibly nac3 pseudocomment, special handling for `# nac3:`
|
|
let (mut prefix, mut is_comment) = self
|
|
.config_comment_prefix
|
|
.map_or_else(|| ("".chars(), false), |v| (v.chars(), true));
|
|
// for the correct location of config comment
|
|
let mut start_loc = self.location;
|
|
start_loc.go_left();
|
|
loop {
|
|
match self.chr0 {
|
|
Some('\n') => return None,
|
|
None => return None,
|
|
Some(c) => {
|
|
if let (true, Some(p)) = (is_comment, prefix.next()) {
|
|
is_comment = is_comment && c == p
|
|
} else {
|
|
// done checking prefix, if is comment then return the spanned
|
|
if is_comment {
|
|
let mut content = String::new();
|
|
loop {
|
|
match self.chr0 {
|
|
Some('\n') | None => break,
|
|
Some(c) => content.push(c),
|
|
}
|
|
self.next_char();
|
|
}
|
|
return Some((
|
|
start_loc,
|
|
Tok::ConfigComment { content: content.trim().into() },
|
|
self.location
|
|
));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
self.next_char();
|
|
};
|
|
}
|
|
|
|
fn unicode_literal(&mut self, literal_number: usize) -> Result<char, LexicalError> {
|
|
let mut p: u32 = 0u32;
|
|
let unicode_error = LexicalError {
|
|
error: LexicalErrorType::UnicodeError,
|
|
location: self.get_pos(),
|
|
};
|
|
for i in 1..=literal_number {
|
|
match self.next_char() {
|
|
Some(c) => match c.to_digit(16) {
|
|
Some(d) => p += d << ((literal_number - i) * 4),
|
|
None => return Err(unicode_error),
|
|
},
|
|
None => return Err(unicode_error),
|
|
}
|
|
}
|
|
match p {
|
|
0xD800..=0xDFFF => Ok(std::char::REPLACEMENT_CHARACTER),
|
|
_ => std::char::from_u32(p).ok_or(unicode_error),
|
|
}
|
|
}
|
|
|
|
fn parse_octet(&mut self, first: char) -> char {
|
|
let mut octet_content = String::new();
|
|
octet_content.push(first);
|
|
while octet_content.len() < 3 {
|
|
if let Some('0'..='7') = self.chr0 {
|
|
octet_content.push(self.next_char().unwrap())
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
let value = u32::from_str_radix(&octet_content, 8).unwrap();
|
|
char::from_u32(value).unwrap()
|
|
}
|
|
|
|
fn parse_unicode_name(&mut self) -> Result<char, LexicalError> {
|
|
let start_pos = self.get_pos();
|
|
match self.next_char() {
|
|
Some('{') => {}
|
|
_ => {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::StringError,
|
|
location: start_pos,
|
|
})
|
|
}
|
|
}
|
|
let start_pos = self.get_pos();
|
|
let mut name = String::new();
|
|
loop {
|
|
match self.next_char() {
|
|
Some('}') => break,
|
|
Some(c) => name.push(c),
|
|
None => {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::StringError,
|
|
location: self.get_pos(),
|
|
})
|
|
}
|
|
}
|
|
}
|
|
unicode_names2::character(&name).ok_or(LexicalError {
|
|
error: LexicalErrorType::UnicodeError,
|
|
location: start_pos,
|
|
})
|
|
}
|
|
|
|
fn lex_string(
|
|
&mut self,
|
|
is_bytes: bool,
|
|
is_raw: bool,
|
|
_is_unicode: bool,
|
|
is_fstring: bool,
|
|
) -> LexResult {
|
|
let quote_char = self.next_char().unwrap();
|
|
let mut string_content = String::new();
|
|
let start_pos = self.get_pos();
|
|
|
|
// If the next two characters are also the quote character, then we have a triple-quoted
|
|
// string; consume those two characters and ensure that we require a triple-quote to close
|
|
let triple_quoted = if self.chr0 == Some(quote_char) && self.chr1 == Some(quote_char) {
|
|
self.next_char();
|
|
self.next_char();
|
|
true
|
|
} else {
|
|
false
|
|
};
|
|
|
|
loop {
|
|
match self.next_char() {
|
|
Some('\\') => {
|
|
if self.chr0 == Some(quote_char) && !is_raw {
|
|
string_content.push(quote_char);
|
|
self.next_char();
|
|
} else if is_raw {
|
|
string_content.push('\\');
|
|
if let Some(c) = self.next_char() {
|
|
string_content.push(c)
|
|
} else {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::StringError,
|
|
location: self.get_pos(),
|
|
});
|
|
}
|
|
} else {
|
|
match self.next_char() {
|
|
Some('\\') => {
|
|
string_content.push('\\');
|
|
}
|
|
Some('\'') => string_content.push('\''),
|
|
Some('\"') => string_content.push('\"'),
|
|
Some('\n') => {
|
|
// Ignore Unix EOL character
|
|
}
|
|
Some('a') => string_content.push('\x07'),
|
|
Some('b') => string_content.push('\x08'),
|
|
Some('f') => string_content.push('\x0c'),
|
|
Some('n') => {
|
|
string_content.push('\n');
|
|
}
|
|
Some('r') => string_content.push('\r'),
|
|
Some('t') => {
|
|
string_content.push('\t');
|
|
}
|
|
Some('v') => string_content.push('\x0b'),
|
|
Some(o @ '0'..='7') => string_content.push(self.parse_octet(o)),
|
|
Some('x') => string_content.push(self.unicode_literal(2)?),
|
|
Some('u') if !is_bytes => string_content.push(self.unicode_literal(4)?),
|
|
Some('U') if !is_bytes => string_content.push(self.unicode_literal(8)?),
|
|
Some('N') if !is_bytes => {
|
|
string_content.push(self.parse_unicode_name()?)
|
|
}
|
|
Some(c) => {
|
|
string_content.push('\\');
|
|
string_content.push(c);
|
|
}
|
|
None => {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::StringError,
|
|
location: self.get_pos(),
|
|
});
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Some(c) => {
|
|
if c == quote_char {
|
|
if triple_quoted {
|
|
// Look ahead at the next two characters; if we have two more
|
|
// quote_chars, it's the end of the string; consume the remaining
|
|
// closing quotes and break the loop
|
|
if self.chr0 == Some(quote_char) && self.chr1 == Some(quote_char) {
|
|
self.next_char();
|
|
self.next_char();
|
|
break;
|
|
}
|
|
string_content.push(c);
|
|
} else {
|
|
break;
|
|
}
|
|
} else {
|
|
if (c == '\n' && !triple_quoted) || (is_bytes && !c.is_ascii()) {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::StringError,
|
|
location: self.get_pos(),
|
|
});
|
|
}
|
|
string_content.push(c);
|
|
}
|
|
}
|
|
None => {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::StringError,
|
|
location: self.get_pos(),
|
|
});
|
|
}
|
|
}
|
|
}
|
|
let end_pos = self.get_pos();
|
|
|
|
let tok = if is_bytes {
|
|
Tok::Bytes {
|
|
value: string_content.chars().map(|c| c as u8).collect(),
|
|
}
|
|
} else {
|
|
Tok::String {
|
|
value: string_content,
|
|
is_fstring,
|
|
}
|
|
};
|
|
|
|
Ok((start_pos, tok, end_pos))
|
|
}
|
|
|
|
fn is_identifier_start(&self, c: char) -> bool {
|
|
match c {
|
|
'_' | 'a'..='z' | 'A'..='Z' => true,
|
|
'+' | '-' | '*' | '/' | '=' | ' ' | '<' | '>' => false,
|
|
c => is_xid_start(c),
|
|
}
|
|
}
|
|
|
|
fn is_identifier_continuation(&self) -> bool {
|
|
if let Some(c) = self.chr0 {
|
|
match c {
|
|
'_' | '0'..='9' | 'a'..='z' | 'A'..='Z' => true,
|
|
'+' | '-' | '*' | '/' | '=' | ' ' | '<' | '>' => false,
|
|
c => is_xid_continue(c),
|
|
}
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
|
|
/// This is the main entry point. Call this function to retrieve the next token.
|
|
/// This function is used by the iterator implementation.
|
|
fn inner_next(&mut self) -> LexResult {
|
|
// top loop, keep on processing, until we have something pending.
|
|
while self.pending.is_empty() {
|
|
// Detect indentation levels
|
|
if self.at_begin_of_line {
|
|
self.handle_indentations()?;
|
|
}
|
|
|
|
self.consume_normal()?;
|
|
}
|
|
|
|
Ok(self.pending.remove(0))
|
|
}
|
|
|
|
/// Given we are at the start of a line, count the number of spaces and/or tabs until the first character.
|
|
fn eat_indentation(&mut self) -> Result<(IndentationLevel, Option<Spanned>), LexicalError> {
|
|
// Determine indentation:
|
|
let mut spaces: usize = 0;
|
|
let mut tabs: usize = 0;
|
|
let mut nac3comment: Option<Spanned> = None;
|
|
loop {
|
|
match self.chr0 {
|
|
Some(' ') => {
|
|
/*
|
|
if tabs != 0 {
|
|
// Don't allow spaces after tabs as part of indentation.
|
|
// This is technically stricter than python3 but spaces after
|
|
// tabs is even more insane than mixing spaces and tabs.
|
|
return Some(Err(LexicalError {
|
|
error: LexicalErrorType::OtherError("Spaces not allowed as part of indentation after tabs".to_owned()),
|
|
location: self.get_pos(),
|
|
}));
|
|
}
|
|
*/
|
|
self.next_char();
|
|
spaces += 1;
|
|
}
|
|
Some('\t') => {
|
|
if spaces != 0 {
|
|
// Don't allow tabs after spaces as part of indentation.
|
|
// This is technically stricter than python3 but spaces before
|
|
// tabs is even more insane than mixing spaces and tabs.
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::TabsAfterSpaces,
|
|
location: self.get_pos(),
|
|
});
|
|
}
|
|
self.next_char();
|
|
tabs += 1;
|
|
}
|
|
Some('#') => {
|
|
nac3comment = self.lex_comment();
|
|
// if is nac3comment, we need to add newline, so it is not begin of line
|
|
// and we should break from the loop, else in the next loop it will be
|
|
// regarded as a empty line
|
|
if nac3comment.is_some() {
|
|
self.at_begin_of_line = false;
|
|
break;
|
|
}
|
|
spaces = 0;
|
|
tabs = 0;
|
|
}
|
|
Some('\x0C') => {
|
|
// Form feed character!
|
|
// Reset indentation for the Emacs user.
|
|
self.next_char();
|
|
spaces = 0;
|
|
tabs = 0;
|
|
}
|
|
Some('\n') => {
|
|
// Empty line!
|
|
self.next_char();
|
|
spaces = 0;
|
|
tabs = 0;
|
|
}
|
|
None => {
|
|
spaces = 0;
|
|
tabs = 0;
|
|
break;
|
|
}
|
|
_ => {
|
|
self.at_begin_of_line = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
Ok((IndentationLevel { tabs, spaces }, nac3comment))
|
|
}
|
|
|
|
fn handle_indentations(&mut self) -> Result<(), LexicalError> {
|
|
let eat_result = self.eat_indentation()?;
|
|
let indentation_level = eat_result.0;
|
|
|
|
if self.nesting == 0 {
|
|
// Determine indent or dedent:
|
|
let current_indentation = self.indentation_stack.last().unwrap();
|
|
let ordering = indentation_level.compare_strict(current_indentation, self.get_pos())?;
|
|
match ordering {
|
|
Ordering::Equal => {
|
|
// Same same
|
|
}
|
|
Ordering::Greater => {
|
|
// New indentation level:
|
|
self.indentation_stack.push(indentation_level);
|
|
let tok_pos = self.get_pos();
|
|
self.emit((tok_pos, Tok::Indent, tok_pos));
|
|
}
|
|
Ordering::Less => {
|
|
// One or more dedentations
|
|
// Pop off other levels until col is found:
|
|
|
|
loop {
|
|
let current_indentation = self.indentation_stack.last().unwrap();
|
|
let ordering = indentation_level
|
|
.compare_strict(current_indentation, self.get_pos())?;
|
|
match ordering {
|
|
Ordering::Less => {
|
|
self.indentation_stack.pop();
|
|
let tok_pos = self.get_pos();
|
|
self.emit((tok_pos, Tok::Dedent, tok_pos));
|
|
}
|
|
Ordering::Equal => {
|
|
// We arrived at proper level of indentation.
|
|
break;
|
|
}
|
|
Ordering::Greater => {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::IndentationError,
|
|
location: self.get_pos(),
|
|
});
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
if let Some(comment) = eat_result.1 {
|
|
self.emit(comment);
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
/// Take a look at the next character, if any, and decide upon the next steps.
|
|
fn consume_normal(&mut self) -> Result<(), LexicalError> {
|
|
// Check if we have some character:
|
|
if let Some(c) = self.chr0 {
|
|
// First check identifier:
|
|
if self.is_identifier_start(c) {
|
|
let identifier = self.lex_identifier()?;
|
|
self.emit(identifier);
|
|
} else if is_emoji_presentation(c) {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((
|
|
tok_start,
|
|
Tok::Name { name: c.to_string().into() },
|
|
tok_end,
|
|
));
|
|
} else {
|
|
self.consume_character(c)?;
|
|
}
|
|
} else {
|
|
// We reached end of file.
|
|
let tok_pos = self.get_pos();
|
|
|
|
// First of all, we need all nestings to be finished.
|
|
if self.nesting > 0 {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::NestingError,
|
|
location: tok_pos,
|
|
});
|
|
}
|
|
|
|
// Next, insert a trailing newline, if required.
|
|
if !self.at_begin_of_line {
|
|
self.at_begin_of_line = true;
|
|
self.emit((tok_pos, Tok::Newline, tok_pos));
|
|
}
|
|
|
|
// Next, flush the indentation stack to zero.
|
|
while self.indentation_stack.len() > 1 {
|
|
self.indentation_stack.pop();
|
|
self.emit((tok_pos, Tok::Dedent, tok_pos));
|
|
}
|
|
|
|
self.emit((tok_pos, Tok::EndOfFile, tok_pos));
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
/// Okay, we are facing a weird character, what is it? Determine that.
|
|
fn consume_character(&mut self, c: char) -> Result<(), LexicalError> {
|
|
match c {
|
|
'0'..='9' => {
|
|
let number = self.lex_number()?;
|
|
self.emit(number);
|
|
}
|
|
'#' => {
|
|
if let Some(c) = self.lex_comment() {
|
|
self.emit(c);
|
|
};
|
|
}
|
|
'"' | '\'' => {
|
|
let string = self.lex_string(false, false, false, false)?;
|
|
self.emit(string);
|
|
}
|
|
'=' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
match self.chr0 {
|
|
Some('=') => {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::EqEqual, tok_end));
|
|
}
|
|
_ => {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Equal, tok_end));
|
|
}
|
|
}
|
|
}
|
|
'+' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
if let Some('=') = self.chr0 {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::PlusEqual, tok_end));
|
|
} else {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Plus, tok_end));
|
|
}
|
|
}
|
|
'*' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
match self.chr0 {
|
|
Some('=') => {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::StarEqual, tok_end));
|
|
}
|
|
Some('*') => {
|
|
self.next_char();
|
|
match self.chr0 {
|
|
Some('=') => {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::DoubleStarEqual, tok_end));
|
|
}
|
|
_ => {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::DoubleStar, tok_end));
|
|
}
|
|
}
|
|
}
|
|
_ => {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Star, tok_end));
|
|
}
|
|
}
|
|
}
|
|
'/' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
match self.chr0 {
|
|
Some('=') => {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::SlashEqual, tok_end));
|
|
}
|
|
Some('/') => {
|
|
self.next_char();
|
|
match self.chr0 {
|
|
Some('=') => {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::DoubleSlashEqual, tok_end));
|
|
}
|
|
_ => {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::DoubleSlash, tok_end));
|
|
}
|
|
}
|
|
}
|
|
_ => {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Slash, tok_end));
|
|
}
|
|
}
|
|
}
|
|
'%' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
if let Some('=') = self.chr0 {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::PercentEqual, tok_end));
|
|
} else {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Percent, tok_end));
|
|
}
|
|
}
|
|
'|' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
if let Some('=') = self.chr0 {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::VbarEqual, tok_end));
|
|
} else {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Vbar, tok_end));
|
|
}
|
|
}
|
|
'^' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
if let Some('=') = self.chr0 {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::CircumflexEqual, tok_end));
|
|
} else {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::CircumFlex, tok_end));
|
|
}
|
|
}
|
|
'&' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
if let Some('=') = self.chr0 {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::AmperEqual, tok_end));
|
|
} else {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Amper, tok_end));
|
|
}
|
|
}
|
|
'-' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
match self.chr0 {
|
|
Some('=') => {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::MinusEqual, tok_end));
|
|
}
|
|
Some('>') => {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Rarrow, tok_end));
|
|
}
|
|
_ => {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Minus, tok_end));
|
|
}
|
|
}
|
|
}
|
|
'@' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
if let Some('=') = self.chr0 {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::AtEqual, tok_end));
|
|
} else {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::At, tok_end));
|
|
}
|
|
}
|
|
'!' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
if let Some('=') = self.chr0 {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::NotEqual, tok_end));
|
|
} else {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::UnrecognizedToken { tok: '!' },
|
|
location: tok_start,
|
|
});
|
|
}
|
|
}
|
|
'~' => {
|
|
self.eat_single_char(Tok::Tilde);
|
|
}
|
|
'(' => {
|
|
self.eat_single_char(Tok::Lpar);
|
|
self.nesting += 1;
|
|
}
|
|
')' => {
|
|
self.eat_single_char(Tok::Rpar);
|
|
if self.nesting == 0 {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::NestingError,
|
|
location: self.get_pos(),
|
|
});
|
|
}
|
|
self.nesting -= 1;
|
|
}
|
|
'[' => {
|
|
self.eat_single_char(Tok::Lsqb);
|
|
self.nesting += 1;
|
|
}
|
|
']' => {
|
|
self.eat_single_char(Tok::Rsqb);
|
|
if self.nesting == 0 {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::NestingError,
|
|
location: self.get_pos(),
|
|
});
|
|
}
|
|
self.nesting -= 1;
|
|
}
|
|
'{' => {
|
|
self.eat_single_char(Tok::Lbrace);
|
|
self.nesting += 1;
|
|
}
|
|
'}' => {
|
|
self.eat_single_char(Tok::Rbrace);
|
|
if self.nesting == 0 {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::NestingError,
|
|
location: self.get_pos(),
|
|
});
|
|
}
|
|
self.nesting -= 1;
|
|
}
|
|
':' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
if let Some('=') = self.chr0 {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::ColonEqual, tok_end));
|
|
} else {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Colon, tok_end));
|
|
}
|
|
}
|
|
';' => {
|
|
self.eat_single_char(Tok::Semi);
|
|
}
|
|
'<' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
match self.chr0 {
|
|
Some('<') => {
|
|
self.next_char();
|
|
match self.chr0 {
|
|
Some('=') => {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::LeftShiftEqual, tok_end));
|
|
}
|
|
_ => {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::LeftShift, tok_end));
|
|
}
|
|
}
|
|
}
|
|
Some('=') => {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::LessEqual, tok_end));
|
|
}
|
|
_ => {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Less, tok_end));
|
|
}
|
|
}
|
|
}
|
|
'>' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
match self.chr0 {
|
|
Some('>') => {
|
|
self.next_char();
|
|
match self.chr0 {
|
|
Some('=') => {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::RightShiftEqual, tok_end));
|
|
}
|
|
_ => {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::RightShift, tok_end));
|
|
}
|
|
}
|
|
}
|
|
Some('=') => {
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::GreaterEqual, tok_end));
|
|
}
|
|
_ => {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Greater, tok_end));
|
|
}
|
|
}
|
|
}
|
|
',' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Comma, tok_end));
|
|
}
|
|
'.' => {
|
|
if let Some('0'..='9') = self.chr1 {
|
|
let number = self.lex_number()?;
|
|
self.emit(number);
|
|
} else {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
if let (Some('.'), Some('.')) = (&self.chr0, &self.chr1) {
|
|
self.next_char();
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Ellipsis, tok_end));
|
|
} else {
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, Tok::Dot, tok_end));
|
|
}
|
|
}
|
|
}
|
|
'\n' => {
|
|
let tok_start = self.get_pos();
|
|
self.next_char();
|
|
let tok_end = self.get_pos();
|
|
|
|
// Depending on the nesting level, we emit newline or not:
|
|
if self.nesting == 0 {
|
|
self.at_begin_of_line = true;
|
|
self.emit((tok_start, Tok::Newline, tok_end));
|
|
}
|
|
}
|
|
' ' | '\t' | '\x0C' => {
|
|
// Skip whitespaces
|
|
self.next_char();
|
|
while self.chr0 == Some(' ') || self.chr0 == Some('\t') || self.chr0 == Some('\x0C')
|
|
{
|
|
self.next_char();
|
|
}
|
|
}
|
|
'\\' => {
|
|
self.next_char();
|
|
if let Some('\n') = self.chr0 {
|
|
self.next_char();
|
|
} else {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::LineContinuationError,
|
|
location: self.get_pos(),
|
|
});
|
|
}
|
|
|
|
if self.chr0.is_none() {
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::Eof,
|
|
location: self.get_pos(),
|
|
});
|
|
}
|
|
}
|
|
|
|
_ => {
|
|
let c = self.next_char();
|
|
return Err(LexicalError {
|
|
error: LexicalErrorType::UnrecognizedToken { tok: c.unwrap() },
|
|
location: self.get_pos(),
|
|
});
|
|
} // Ignore all the rest..
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
fn eat_single_char(&mut self, ty: Tok) {
|
|
let tok_start = self.get_pos();
|
|
self.next_char().unwrap();
|
|
let tok_end = self.get_pos();
|
|
self.emit((tok_start, ty, tok_end));
|
|
}
|
|
|
|
/// Helper function to go to the next character coming up.
|
|
fn next_char(&mut self) -> Option<char> {
|
|
let c = self.chr0;
|
|
let nxt = self.chars.next();
|
|
self.chr0 = self.chr1;
|
|
self.chr1 = self.chr2;
|
|
self.chr2 = nxt;
|
|
if c == Some('\n') {
|
|
self.location.newline();
|
|
} else {
|
|
self.location.go_right();
|
|
}
|
|
c
|
|
}
|
|
|
|
/// Helper function to retrieve the current position.
|
|
fn get_pos(&self) -> Location {
|
|
self.location
|
|
}
|
|
|
|
/// Helper function to emit a lexed token to the queue of tokens.
|
|
fn emit(&mut self, spanned: Spanned) {
|
|
self.pending.push(spanned);
|
|
}
|
|
}
|
|
|
|
/* Implement iterator pattern for the get_tok function.
|
|
|
|
Calling the next element in the iterator will yield the next lexical
|
|
token.
|
|
*/
|
|
impl<T> Iterator for Lexer<T>
|
|
where
|
|
T: Iterator<Item = char>,
|
|
{
|
|
type Item = LexResult;
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
// Idea: create some sort of hash map for single char tokens:
|
|
// let mut X = HashMap::new();
|
|
// X.insert('=', Tok::Equal);
|
|
let token = self.inner_next();
|
|
trace!(
|
|
"Lex token {:?}, nesting={:?}, indent stack: {:?}",
|
|
token,
|
|
self.nesting,
|
|
self.indentation_stack
|
|
);
|
|
|
|
match token {
|
|
Ok((_, Tok::EndOfFile, _)) => None,
|
|
r => Some(r),
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::{make_tokenizer, NewlineHandler, Tok};
|
|
|
|
const WINDOWS_EOL: &str = "\r\n";
|
|
const MAC_EOL: &str = "\r";
|
|
const UNIX_EOL: &str = "\n";
|
|
|
|
pub fn lex_source(source: &str) -> Vec<Tok> {
|
|
let lexer = make_tokenizer(source, Default::default());
|
|
lexer.map(|x| x.unwrap().1).collect()
|
|
}
|
|
|
|
#[test]
|
|
fn test_nac3comment() {
|
|
let src = "\
|
|
a: int32
|
|
# nac3:
|
|
b: int64";
|
|
let tokens = lex_source(src);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Name { name: "a".into() },
|
|
Tok::Colon,
|
|
Tok::Name { name: "int32".into() },
|
|
Tok::Newline,
|
|
Tok::ConfigComment { content: "".into() },
|
|
Tok::Newline,
|
|
Tok::Name { name: "b".into() },
|
|
Tok::Colon,
|
|
Tok::Name { name: "int64".into() },
|
|
Tok::Newline,
|
|
]
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_class_lex_with_nac3comment() {
|
|
use Tok::*;
|
|
let source = "\
|
|
class Foo(A, B):
|
|
# normal comment
|
|
# nac3: no indent
|
|
# nac3: correct indent
|
|
b: int32
|
|
a: int32 # nac3: no need indent
|
|
def __init__(self):
|
|
pass";
|
|
let tokens = lex_source(source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Class,
|
|
Name { name: "Foo".into() },
|
|
Lpar,
|
|
Name { name: "A".into() },
|
|
Comma,
|
|
Name { name: "B".into() },
|
|
Rpar,
|
|
Colon,
|
|
Newline,
|
|
ConfigComment { content: "no indent".into() },
|
|
Newline,
|
|
Indent,
|
|
ConfigComment { content: "correct indent".into() },
|
|
Newline,
|
|
Name { name: "b".into() },
|
|
Colon,
|
|
Name { name: "int32".into() },
|
|
Newline,
|
|
Name { name: "a".into() },
|
|
Colon,
|
|
Name { name: "int32".into() },
|
|
ConfigComment { content: "no need indent".into() },
|
|
Newline,
|
|
Def,
|
|
Name { name: "__init__".into() },
|
|
Lpar,
|
|
Name { name: "self".into() },
|
|
Rpar,
|
|
Colon,
|
|
Newline,
|
|
Indent,
|
|
Pass,
|
|
Newline,
|
|
Dedent,
|
|
Dedent
|
|
]
|
|
)
|
|
}
|
|
|
|
#[test]
|
|
fn test_newline_processor() {
|
|
// Escape \ followed by \n (by removal):
|
|
let src = "b\\\r\n";
|
|
assert_eq!(4, src.len());
|
|
let nlh = NewlineHandler::new(src.chars());
|
|
let x: Vec<char> = nlh.collect();
|
|
assert_eq!(vec!['b', '\\', '\n'], x);
|
|
}
|
|
|
|
#[test]
|
|
fn test_raw_string() {
|
|
let source = "r\"\\\\\" \"\\\\\"";
|
|
let tokens = lex_source(source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::String {
|
|
value: "\\\\".to_owned(),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: "\\".to_owned(),
|
|
is_fstring: false,
|
|
},
|
|
Tok::Newline,
|
|
]
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_numbers() {
|
|
let source = "0x2f 0b1101 0 123 0.2 2j 2.2j";
|
|
let tokens = lex_source(source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Int {
|
|
value: 47i128,
|
|
},
|
|
Tok::Int {
|
|
value: 13i128,
|
|
},
|
|
Tok::Int {
|
|
value: 0i128,
|
|
},
|
|
Tok::Int {
|
|
value: 123i128,
|
|
},
|
|
Tok::Float { value: 0.2 },
|
|
Tok::Complex {
|
|
real: 0.0,
|
|
imag: 2.0,
|
|
},
|
|
Tok::Complex {
|
|
real: 0.0,
|
|
imag: 2.2,
|
|
},
|
|
Tok::Newline,
|
|
]
|
|
);
|
|
}
|
|
|
|
macro_rules! test_line_comment {
|
|
($($name:ident: $eol:expr,)*) => {
|
|
$(
|
|
#[test]
|
|
fn $name() {
|
|
let source = format!(r"99232 # {}", $eol);
|
|
let tokens = lex_source(&source);
|
|
assert_eq!(tokens, vec![Tok::Int { value: 99232i128 }, Tok::Newline]);
|
|
}
|
|
)*
|
|
}
|
|
}
|
|
|
|
test_line_comment! {
|
|
test_line_comment_long: " foo",
|
|
test_line_comment_whitespace: " ",
|
|
test_line_comment_single_whitespace: " ",
|
|
test_line_comment_empty: "",
|
|
}
|
|
|
|
macro_rules! test_comment_until_eol {
|
|
($($name:ident: $eol:expr,)*) => {
|
|
$(
|
|
#[test]
|
|
fn $name() {
|
|
let source = format!("123 # Foo{}456", $eol);
|
|
let tokens = lex_source(&source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Int { value: 123i128 },
|
|
Tok::Newline,
|
|
Tok::Int { value: 456i128 },
|
|
Tok::Newline,
|
|
]
|
|
)
|
|
}
|
|
)*
|
|
}
|
|
}
|
|
|
|
test_comment_until_eol! {
|
|
test_comment_until_windows_eol: WINDOWS_EOL,
|
|
test_comment_until_mac_eol: MAC_EOL,
|
|
test_comment_until_unix_eol: UNIX_EOL,
|
|
}
|
|
|
|
#[test]
|
|
fn test_assignment() {
|
|
let source = r"avariable = 99 + 2-0";
|
|
let tokens = lex_source(source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Name {
|
|
name: String::from("avariable").into(),
|
|
},
|
|
Tok::Equal,
|
|
Tok::Int {
|
|
value: 99i128
|
|
},
|
|
Tok::Plus,
|
|
Tok::Int {
|
|
value: 2i128
|
|
},
|
|
Tok::Minus,
|
|
Tok::Int {
|
|
value: 0i128
|
|
},
|
|
Tok::Newline,
|
|
]
|
|
);
|
|
}
|
|
|
|
macro_rules! test_indentation_with_eol {
|
|
($($name:ident: $eol:expr,)*) => {
|
|
$(
|
|
#[test]
|
|
fn $name() {
|
|
let source = format!("def foo():{} return 99{}{}", $eol, $eol, $eol);
|
|
let tokens = lex_source(&source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Def,
|
|
Tok::Name {
|
|
name: String::from("foo").into(),
|
|
},
|
|
Tok::Lpar,
|
|
Tok::Rpar,
|
|
Tok::Colon,
|
|
Tok::Newline,
|
|
Tok::Indent,
|
|
Tok::Return,
|
|
Tok::Int { value: 99i128 },
|
|
Tok::Newline,
|
|
Tok::Dedent,
|
|
]
|
|
);
|
|
}
|
|
)*
|
|
};
|
|
}
|
|
|
|
test_indentation_with_eol! {
|
|
test_indentation_windows_eol: WINDOWS_EOL,
|
|
test_indentation_mac_eol: MAC_EOL,
|
|
test_indentation_unix_eol: UNIX_EOL,
|
|
}
|
|
|
|
macro_rules! test_double_dedent_with_eol {
|
|
($($name:ident: $eol:expr,)*) => {
|
|
$(
|
|
#[test]
|
|
fn $name() {
|
|
let source = format!("def foo():{} if x:{}{} return 99{}{}", $eol, $eol, $eol, $eol, $eol);
|
|
let tokens = lex_source(&source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Def,
|
|
Tok::Name {
|
|
name: String::from("foo").into(),
|
|
},
|
|
Tok::Lpar,
|
|
Tok::Rpar,
|
|
Tok::Colon,
|
|
Tok::Newline,
|
|
Tok::Indent,
|
|
Tok::If,
|
|
Tok::Name {
|
|
name: String::from("x").into(),
|
|
},
|
|
Tok::Colon,
|
|
Tok::Newline,
|
|
Tok::Indent,
|
|
Tok::Return,
|
|
Tok::Int { value: 99i128 },
|
|
Tok::Newline,
|
|
Tok::Dedent,
|
|
Tok::Dedent,
|
|
]
|
|
);
|
|
}
|
|
)*
|
|
}
|
|
}
|
|
|
|
macro_rules! test_double_dedent_with_tabs {
|
|
($($name:ident: $eol:expr,)*) => {
|
|
$(
|
|
#[test]
|
|
fn $name() {
|
|
let source = format!("def foo():{}\tif x:{}{}\t return 99{}{}", $eol, $eol, $eol, $eol, $eol);
|
|
let tokens = lex_source(&source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Def,
|
|
Tok::Name {
|
|
name: String::from("foo").into(),
|
|
},
|
|
Tok::Lpar,
|
|
Tok::Rpar,
|
|
Tok::Colon,
|
|
Tok::Newline,
|
|
Tok::Indent,
|
|
Tok::If,
|
|
Tok::Name {
|
|
name: String::from("x").into(),
|
|
},
|
|
Tok::Colon,
|
|
Tok::Newline,
|
|
Tok::Indent,
|
|
Tok::Return,
|
|
Tok::Int { value: 99i128 },
|
|
Tok::Newline,
|
|
Tok::Dedent,
|
|
Tok::Dedent,
|
|
]
|
|
);
|
|
}
|
|
)*
|
|
}
|
|
}
|
|
|
|
test_double_dedent_with_eol! {
|
|
test_double_dedent_windows_eol: WINDOWS_EOL,
|
|
test_double_dedent_mac_eol: MAC_EOL,
|
|
test_double_dedent_unix_eol: UNIX_EOL,
|
|
}
|
|
|
|
test_double_dedent_with_tabs! {
|
|
test_double_dedent_tabs_windows_eol: WINDOWS_EOL,
|
|
test_double_dedent_tabs_mac_eol: MAC_EOL,
|
|
test_double_dedent_tabs_unix_eol: UNIX_EOL,
|
|
}
|
|
|
|
macro_rules! test_newline_in_brackets {
|
|
($($name:ident: $eol:expr,)*) => {
|
|
$(
|
|
#[test]
|
|
fn $name() {
|
|
let source = format!("x = [{} 1,2{}]{}", $eol, $eol, $eol);
|
|
let tokens = lex_source(&source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Name {
|
|
name: String::from("x").into(),
|
|
},
|
|
Tok::Equal,
|
|
Tok::Lsqb,
|
|
Tok::Int { value: 1i128 },
|
|
Tok::Comma,
|
|
Tok::Int { value: 2i128 },
|
|
Tok::Rsqb,
|
|
Tok::Newline,
|
|
]
|
|
);
|
|
}
|
|
)*
|
|
};
|
|
}
|
|
|
|
test_newline_in_brackets! {
|
|
test_newline_in_brackets_windows_eol: WINDOWS_EOL,
|
|
test_newline_in_brackets_mac_eol: MAC_EOL,
|
|
test_newline_in_brackets_unix_eol: UNIX_EOL,
|
|
}
|
|
|
|
#[test]
|
|
fn test_operators() {
|
|
let source = "//////=/ /";
|
|
let tokens = lex_source(source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::DoubleSlash,
|
|
Tok::DoubleSlash,
|
|
Tok::DoubleSlashEqual,
|
|
Tok::Slash,
|
|
Tok::Slash,
|
|
Tok::Newline,
|
|
]
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_string() {
|
|
let source = r#""double" 'single' 'can\'t' "\\\"" '\t\r\n' '\g' r'raw\'' '\420' '\200\0a'"#;
|
|
let tokens = lex_source(source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::String {
|
|
value: String::from("double"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("single"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("can't"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("\\\""),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("\t\r\n"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("\\g"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("raw\\'"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("Đ"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("\u{80}\u{0}a"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::Newline,
|
|
]
|
|
);
|
|
}
|
|
|
|
macro_rules! test_string_continuation {
|
|
($($name:ident: $eol:expr,)*) => {
|
|
$(
|
|
#[test]
|
|
fn $name() {
|
|
let source = format!("\"abc\\{}def\"", $eol);
|
|
let tokens = lex_source(&source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::String {
|
|
value: String::from("abcdef"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::Newline,
|
|
]
|
|
)
|
|
}
|
|
)*
|
|
}
|
|
}
|
|
|
|
test_string_continuation! {
|
|
test_string_continuation_windows_eol: WINDOWS_EOL,
|
|
test_string_continuation_mac_eol: MAC_EOL,
|
|
test_string_continuation_unix_eol: UNIX_EOL,
|
|
}
|
|
|
|
#[test]
|
|
fn test_single_quoted_byte() {
|
|
// single quote
|
|
let source = r##"b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff'"##;
|
|
let tokens = lex_source(source);
|
|
let res = (0..=255).collect::<Vec<u8>>();
|
|
assert_eq!(tokens, vec![Tok::Bytes { value: res }, Tok::Newline]);
|
|
}
|
|
|
|
#[test]
|
|
fn test_double_quoted_byte() {
|
|
// double quote
|
|
let source = r##"b"\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\x0b\x0c\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff""##;
|
|
let tokens = lex_source(source);
|
|
let res = (0..=255).collect::<Vec<u8>>();
|
|
assert_eq!(tokens, vec![Tok::Bytes { value: res }, Tok::Newline]);
|
|
}
|
|
|
|
#[test]
|
|
fn test_escape_char_in_byte_literal() {
|
|
// backslash does not escape
|
|
let source = r##"b"omkmok\Xaa""##;
|
|
let tokens = lex_source(source);
|
|
let res = vec![111, 109, 107, 109, 111, 107, 92, 88, 97, 97];
|
|
assert_eq!(tokens, vec![Tok::Bytes { value: res }, Tok::Newline]);
|
|
}
|
|
|
|
#[test]
|
|
fn test_raw_byte_literal() {
|
|
let source = r"rb'\x1z'";
|
|
let tokens = lex_source(source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Bytes {
|
|
value: b"\\x1z".to_vec()
|
|
},
|
|
Tok::Newline
|
|
]
|
|
);
|
|
let source = r"rb'\\'";
|
|
let tokens = lex_source(source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Bytes {
|
|
value: b"\\\\".to_vec()
|
|
},
|
|
Tok::Newline
|
|
]
|
|
)
|
|
}
|
|
|
|
#[test]
|
|
fn test_escape_octet() {
|
|
let source = r##"b'\43a\4\1234'"##;
|
|
let tokens = lex_source(source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Bytes {
|
|
value: b"#a\x04S4".to_vec()
|
|
},
|
|
Tok::Newline
|
|
]
|
|
)
|
|
}
|
|
|
|
#[test]
|
|
fn test_escape_unicode_name() {
|
|
let source = r#""\N{EN SPACE}""#;
|
|
let tokens = lex_source(source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::String {
|
|
value: "\u{2002}".to_owned(),
|
|
is_fstring: false,
|
|
},
|
|
Tok::Newline
|
|
]
|
|
)
|
|
}
|
|
}
|