forked from M-Labs/nac3
1758 lines
59 KiB
Rust
1758 lines
59 KiB
Rust
//! This module takes care of lexing python source text.
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//!
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//! This means source code is translated into separate tokens.
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pub use super::token::Tok;
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use crate::ast::Location;
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use crate::error::{LexicalError, LexicalErrorType};
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use num_bigint::BigInt;
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use num_traits::identities::Zero;
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use num_traits::Num;
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use std::char;
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use std::cmp::Ordering;
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use std::str::FromStr;
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use unic_emoji_char::is_emoji_presentation;
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use unic_ucd_ident::{is_xid_continue, is_xid_start};
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#[derive(Clone, Copy, PartialEq, Debug, Default)]
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struct IndentationLevel {
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tabs: usize,
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spaces: usize,
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}
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impl IndentationLevel {
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fn compare_strict(
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&self,
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other: &IndentationLevel,
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location: Location,
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) -> Result<Ordering, LexicalError> {
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// We only know for sure that we're smaller or bigger if tabs
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// and spaces both differ in the same direction. Otherwise we're
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// dependent on the size of tabs.
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match self.tabs.cmp(&other.tabs) {
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Ordering::Less => {
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if self.spaces <= other.spaces {
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Ok(Ordering::Less)
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} else {
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Err(LexicalError {
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location,
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error: LexicalErrorType::TabError,
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})
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}
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}
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Ordering::Greater => {
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if self.spaces >= other.spaces {
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Ok(Ordering::Greater)
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} else {
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Err(LexicalError {
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location,
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error: LexicalErrorType::TabError,
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})
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}
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}
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Ordering::Equal => Ok(self.spaces.cmp(&other.spaces)),
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}
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}
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}
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pub struct Lexer<T: Iterator<Item = char>> {
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chars: T,
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at_begin_of_line: bool,
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nesting: usize, // Amount of parenthesis
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indentation_stack: Vec<IndentationLevel>,
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pending: Vec<Spanned>,
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chr0: Option<char>,
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chr1: Option<char>,
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chr2: Option<char>,
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location: Location,
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}
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pub static KEYWORDS: phf::Map<&'static str, Tok> = phf::phf_map! {
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// Alphabetical keywords:
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"..." => Tok::Ellipsis,
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"False" => Tok::False,
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"None" => Tok::None,
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"True" => Tok::True,
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"and" => Tok::And,
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"as" => Tok::As,
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"assert" => Tok::Assert,
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"async" => Tok::Async,
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"await" => Tok::Await,
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"break" => Tok::Break,
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"class" => Tok::Class,
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"continue" => Tok::Continue,
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"def" => Tok::Def,
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"del" => Tok::Del,
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"elif" => Tok::Elif,
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"else" => Tok::Else,
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"except" => Tok::Except,
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"finally" => Tok::Finally,
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"for" => Tok::For,
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"from" => Tok::From,
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"global" => Tok::Global,
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"if" => Tok::If,
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"import" => Tok::Import,
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"in" => Tok::In,
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"is" => Tok::Is,
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"lambda" => Tok::Lambda,
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"nonlocal" => Tok::Nonlocal,
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"not" => Tok::Not,
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"or" => Tok::Or,
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"pass" => Tok::Pass,
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"raise" => Tok::Raise,
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"return" => Tok::Return,
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"try" => Tok::Try,
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"while" => Tok::While,
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"with" => Tok::With,
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"yield" => Tok::Yield,
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};
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pub type Spanned = (Location, Tok, Location);
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pub type LexResult = Result<Spanned, LexicalError>;
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#[inline]
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pub fn make_tokenizer(source: &str) -> impl Iterator<Item = LexResult> + '_ {
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make_tokenizer_located(source, Location::new(0, 0))
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}
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pub fn make_tokenizer_located(
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source: &str,
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start_location: Location,
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) -> impl Iterator<Item = LexResult> + '_ {
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let nlh = NewlineHandler::new(source.chars());
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Lexer::new(nlh, start_location)
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}
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// The newline handler is an iterator which collapses different newline
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// types into \n always.
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pub struct NewlineHandler<T: Iterator<Item = char>> {
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source: T,
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chr0: Option<char>,
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chr1: Option<char>,
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}
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impl<T> NewlineHandler<T>
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where
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T: Iterator<Item = char>,
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{
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pub fn new(source: T) -> Self {
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let mut nlh = NewlineHandler {
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source,
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chr0: None,
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chr1: None,
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};
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nlh.shift();
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nlh.shift();
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nlh
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}
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fn shift(&mut self) -> Option<char> {
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let result = self.chr0;
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self.chr0 = self.chr1;
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self.chr1 = self.source.next();
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result
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}
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}
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impl<T> Iterator for NewlineHandler<T>
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where
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T: Iterator<Item = char>,
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{
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type Item = char;
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fn next(&mut self) -> Option<Self::Item> {
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// Collapse \r\n into \n
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loop {
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if self.chr0 == Some('\r') {
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if self.chr1 == Some('\n') {
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// Transform windows EOL into \n
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self.shift();
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} else {
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// Transform MAC EOL into \n
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self.chr0 = Some('\n')
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}
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} else {
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break;
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}
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}
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self.shift()
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}
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}
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impl<T> Lexer<T>
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where
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T: Iterator<Item = char>,
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{
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pub fn new(input: T, start: Location) -> Self {
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let mut lxr = Lexer {
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chars: input,
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at_begin_of_line: true,
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nesting: 0,
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indentation_stack: vec![Default::default()],
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pending: Vec::new(),
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chr0: None,
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location: start,
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chr1: None,
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chr2: None,
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};
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lxr.next_char();
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lxr.next_char();
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lxr.next_char();
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// Start at top row (=1) left column (=1)
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lxr.location.reset();
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lxr
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}
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// Lexer helper functions:
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fn lex_identifier(&mut self) -> LexResult {
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let mut name = String::new();
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let start_pos = self.get_pos();
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// Detect potential string like rb'' b'' f'' u'' r''
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let mut saw_b = false;
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let mut saw_r = false;
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let mut saw_u = false;
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let mut saw_f = false;
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loop {
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// Detect r"", f"", b"" and u""
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if !(saw_b || saw_u || saw_f) && matches!(self.chr0, Some('b') | Some('B')) {
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saw_b = true;
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} else if !(saw_b || saw_r || saw_u || saw_f)
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&& matches!(self.chr0, Some('u') | Some('U'))
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{
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saw_u = true;
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} else if !(saw_r || saw_u) && (self.chr0 == Some('r') || self.chr0 == Some('R')) {
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saw_r = true;
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} else if !(saw_b || saw_u || saw_f)
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&& (self.chr0 == Some('f') || self.chr0 == Some('F'))
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{
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saw_f = true;
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} else {
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break;
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}
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// Take up char into name:
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name.push(self.next_char().unwrap());
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// Check if we have a string:
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if self.chr0 == Some('"') || self.chr0 == Some('\'') {
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return self.lex_string(saw_b, saw_r, saw_u, saw_f);
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}
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}
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while self.is_identifier_continuation() {
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name.push(self.next_char().unwrap());
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}
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let end_pos = self.get_pos();
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if let Some(tok) = KEYWORDS.get(name.as_str()) {
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Ok((start_pos, tok.clone(), end_pos))
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} else {
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Ok((start_pos, Tok::Name { name }, end_pos))
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}
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}
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/// Numeric lexing. The feast can start!
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fn lex_number(&mut self) -> LexResult {
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let start_pos = self.get_pos();
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if self.chr0 == Some('0') {
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if self.chr1 == Some('x') || self.chr1 == Some('X') {
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// Hex!
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self.next_char();
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self.next_char();
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self.lex_number_radix(start_pos, 16)
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} else if self.chr1 == Some('o') || self.chr1 == Some('O') {
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// Octal style!
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self.next_char();
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self.next_char();
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self.lex_number_radix(start_pos, 8)
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} else if self.chr1 == Some('b') || self.chr1 == Some('B') {
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// Binary!
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self.next_char();
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self.next_char();
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self.lex_number_radix(start_pos, 2)
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} else {
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self.lex_normal_number()
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}
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} else {
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self.lex_normal_number()
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}
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}
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/// Lex a hex/octal/decimal/binary number without a decimal point.
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fn lex_number_radix(&mut self, start_pos: Location, radix: u32) -> LexResult {
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let value_text = self.radix_run(radix);
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let end_pos = self.get_pos();
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let value = BigInt::from_str_radix(&value_text, radix).map_err(|e| LexicalError {
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error: LexicalErrorType::OtherError(format!("{:?}", e)),
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location: start_pos,
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})?;
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Ok((start_pos, Tok::Int { value }, end_pos))
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}
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/// Lex a normal number, that is, no octal, hex or binary number.
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fn lex_normal_number(&mut self) -> LexResult {
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let start_pos = self.get_pos();
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let start_is_zero = self.chr0 == Some('0');
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// Normal number:
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let mut value_text = self.radix_run(10);
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// If float:
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if self.chr0 == Some('.') || self.at_exponent() {
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// Take '.':
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if self.chr0 == Some('.') {
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if self.chr1 == Some('_') {
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return Err(LexicalError {
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error: LexicalErrorType::OtherError("Invalid Syntax".to_owned()),
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location: self.get_pos(),
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});
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}
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value_text.push(self.next_char().unwrap());
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value_text.push_str(&self.radix_run(10));
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}
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// 1e6 for example:
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if self.chr0 == Some('e') || self.chr0 == Some('E') {
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value_text.push(self.next_char().unwrap().to_ascii_lowercase());
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// Optional +/-
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if self.chr0 == Some('-') || self.chr0 == Some('+') {
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value_text.push(self.next_char().unwrap());
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}
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value_text.push_str(&self.radix_run(10));
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}
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let value = f64::from_str(&value_text).unwrap();
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// Parse trailing 'j':
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if self.chr0 == Some('j') || self.chr0 == Some('J') {
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self.next_char();
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let end_pos = self.get_pos();
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Ok((
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start_pos,
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Tok::Complex {
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real: 0.0,
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imag: value,
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},
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end_pos,
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))
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} else {
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let end_pos = self.get_pos();
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Ok((start_pos, Tok::Float { value }, end_pos))
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}
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} else {
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// Parse trailing 'j':
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if self.chr0 == Some('j') || self.chr0 == Some('J') {
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self.next_char();
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let end_pos = self.get_pos();
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let imag = f64::from_str(&value_text).unwrap();
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Ok((start_pos, Tok::Complex { real: 0.0, imag }, end_pos))
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} else {
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let end_pos = self.get_pos();
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let value = value_text.parse::<BigInt>().unwrap();
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if start_is_zero && !value.is_zero() {
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return Err(LexicalError {
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error: LexicalErrorType::OtherError("Invalid Token".to_owned()),
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location: self.get_pos(),
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});
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}
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Ok((start_pos, Tok::Int { value }, end_pos))
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}
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}
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}
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/// Consume a sequence of numbers with the given radix,
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/// the digits can be decorated with underscores
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/// like this: '1_2_3_4' == '1234'
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fn radix_run(&mut self, radix: u32) -> String {
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let mut value_text = String::new();
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loop {
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if let Some(c) = self.take_number(radix) {
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value_text.push(c);
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} else if self.chr0 == Some('_') && Lexer::<T>::is_digit_of_radix(self.chr1, radix) {
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self.next_char();
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} else {
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break;
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}
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}
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value_text
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}
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/// Consume a single character with the given radix.
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fn take_number(&mut self, radix: u32) -> Option<char> {
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let take_char = Lexer::<T>::is_digit_of_radix(self.chr0, radix);
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if take_char {
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Some(self.next_char().unwrap())
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} else {
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None
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}
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}
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/// Test if a digit is of a certain radix.
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fn is_digit_of_radix(c: Option<char>, radix: u32) -> bool {
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match radix {
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2 => matches!(c, Some('0'..='1')),
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8 => matches!(c, Some('0'..='7')),
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10 => matches!(c, Some('0'..='9')),
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16 => matches!(c, Some('0'..='9') | Some('a'..='f') | Some('A'..='F')),
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other => unimplemented!("Radix not implemented: {}", other),
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}
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}
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/// Test if we face '[eE][-+]?[0-9]+'
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fn at_exponent(&self) -> bool {
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match self.chr0 {
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Some('e') | Some('E') => match self.chr1 {
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Some('+') | Some('-') => matches!(self.chr2, Some('0'..='9')),
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Some('0'..='9') => true,
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_ => false,
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},
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_ => false,
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}
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}
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/// Skip everything until end of line
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fn lex_comment(&mut self) {
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self.next_char();
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loop {
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match self.chr0 {
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Some('\n') => return,
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Some(_) => {}
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None => return,
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}
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self.next_char();
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}
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}
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fn unicode_literal(&mut self, literal_number: usize) -> Result<char, LexicalError> {
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let mut p: u32 = 0u32;
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let unicode_error = LexicalError {
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error: LexicalErrorType::UnicodeError,
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location: self.get_pos(),
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};
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for i in 1..=literal_number {
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match self.next_char() {
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Some(c) => match c.to_digit(16) {
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Some(d) => p += d << ((literal_number - i) * 4),
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None => return Err(unicode_error),
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},
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None => return Err(unicode_error),
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}
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}
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match p {
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0xD800..=0xDFFF => Ok(std::char::REPLACEMENT_CHARACTER),
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_ => std::char::from_u32(p).ok_or(unicode_error),
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}
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}
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fn parse_octet(&mut self, first: char) -> char {
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let mut octet_content = String::new();
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octet_content.push(first);
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while octet_content.len() < 3 {
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if let Some('0'..='7') = self.chr0 {
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octet_content.push(self.next_char().unwrap())
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} else {
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break;
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}
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}
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let value = u32::from_str_radix(&octet_content, 8).unwrap();
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char::from_u32(value).unwrap()
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}
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fn parse_unicode_name(&mut self) -> Result<char, LexicalError> {
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let start_pos = self.get_pos();
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match self.next_char() {
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Some('{') => {}
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_ => {
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return Err(LexicalError {
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error: LexicalErrorType::StringError,
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location: start_pos,
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})
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}
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}
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let start_pos = self.get_pos();
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let mut name = String::new();
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loop {
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match self.next_char() {
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Some('}') => break,
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Some(c) => name.push(c),
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None => {
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return Err(LexicalError {
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error: LexicalErrorType::StringError,
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location: self.get_pos(),
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})
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}
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}
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}
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unicode_names2::character(&name).ok_or(LexicalError {
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error: LexicalErrorType::UnicodeError,
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location: start_pos,
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})
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}
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fn lex_string(
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&mut self,
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is_bytes: bool,
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is_raw: bool,
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_is_unicode: bool,
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is_fstring: bool,
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) -> LexResult {
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let quote_char = self.next_char().unwrap();
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let mut string_content = String::new();
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let start_pos = self.get_pos();
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// If the next two characters are also the quote character, then we have a triple-quoted
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// string; consume those two characters and ensure that we require a triple-quote to close
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let triple_quoted = if self.chr0 == Some(quote_char) && self.chr1 == Some(quote_char) {
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self.next_char();
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self.next_char();
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true
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} else {
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false
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};
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|
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loop {
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match self.next_char() {
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Some('\\') => {
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if self.chr0 == Some(quote_char) && !is_raw {
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string_content.push(quote_char);
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self.next_char();
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} else if is_raw {
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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 {
|
|
c == '_' || is_xid_start(c)
|
|
}
|
|
|
|
fn is_identifier_continuation(&self) -> bool {
|
|
if let Some(c) = self.chr0 {
|
|
match c {
|
|
'_' | '0'..='9' => true,
|
|
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, LexicalError> {
|
|
// Determine indentation:
|
|
let mut spaces: usize = 0;
|
|
let mut tabs: usize = 0;
|
|
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('#') => {
|
|
self.lex_comment();
|
|
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 })
|
|
}
|
|
|
|
fn handle_indentations(&mut self) -> Result<(), LexicalError> {
|
|
let indentation_level = self.eat_indentation()?;
|
|
|
|
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(),
|
|
});
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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(),
|
|
},
|
|
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);
|
|
}
|
|
'#' => {
|
|
self.lex_comment();
|
|
}
|
|
'"' | '\'' => {
|
|
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};
|
|
use num_bigint::BigInt;
|
|
|
|
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);
|
|
lexer.map(|x| x.unwrap().1).collect()
|
|
}
|
|
|
|
#[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: BigInt::from(47),
|
|
},
|
|
Tok::Int {
|
|
value: BigInt::from(13),
|
|
},
|
|
Tok::Int {
|
|
value: BigInt::from(0),
|
|
},
|
|
Tok::Int {
|
|
value: BigInt::from(123),
|
|
},
|
|
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 # {}", $eol);
|
|
let tokens = lex_source(&source);
|
|
assert_eq!(tokens, vec![Tok::Int { value: BigInt::from(99232) }, Tok::Newline]);
|
|
}
|
|
)*
|
|
}
|
|
}
|
|
|
|
test_line_comment! {
|
|
test_line_comment_long: " foo",
|
|
test_line_comment_whitespace: " ",
|
|
test_line_comment_single_whitespace: " ",
|
|
test_line_comment_empty: "",
|
|
}
|
|
|
|
macro_rules! test_comment_until_eol {
|
|
($($name:ident: $eol:expr,)*) => {
|
|
$(
|
|
#[test]
|
|
fn $name() {
|
|
let source = format!("123 # Foo{}456", $eol);
|
|
let tokens = lex_source(&source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Int { value: BigInt::from(123) },
|
|
Tok::Newline,
|
|
Tok::Int { value: BigInt::from(456) },
|
|
Tok::Newline,
|
|
]
|
|
)
|
|
}
|
|
)*
|
|
}
|
|
}
|
|
|
|
test_comment_until_eol! {
|
|
test_comment_until_windows_eol: WINDOWS_EOL,
|
|
test_comment_until_mac_eol: MAC_EOL,
|
|
test_comment_until_unix_eol: UNIX_EOL,
|
|
}
|
|
|
|
#[test]
|
|
fn test_assignment() {
|
|
let source = r"avariable = 99 + 2-0";
|
|
let tokens = lex_source(source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Name {
|
|
name: String::from("avariable"),
|
|
},
|
|
Tok::Equal,
|
|
Tok::Int {
|
|
value: BigInt::from(99)
|
|
},
|
|
Tok::Plus,
|
|
Tok::Int {
|
|
value: BigInt::from(2)
|
|
},
|
|
Tok::Minus,
|
|
Tok::Int {
|
|
value: BigInt::from(0)
|
|
},
|
|
Tok::Newline,
|
|
]
|
|
);
|
|
}
|
|
|
|
macro_rules! test_indentation_with_eol {
|
|
($($name:ident: $eol:expr,)*) => {
|
|
$(
|
|
#[test]
|
|
fn $name() {
|
|
let source = format!("def foo():{} return 99{}{}", $eol, $eol, $eol);
|
|
let tokens = lex_source(&source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Def,
|
|
Tok::Name {
|
|
name: String::from("foo"),
|
|
},
|
|
Tok::Lpar,
|
|
Tok::Rpar,
|
|
Tok::Colon,
|
|
Tok::Newline,
|
|
Tok::Indent,
|
|
Tok::Return,
|
|
Tok::Int { value: BigInt::from(99) },
|
|
Tok::Newline,
|
|
Tok::Dedent,
|
|
]
|
|
);
|
|
}
|
|
)*
|
|
};
|
|
}
|
|
|
|
test_indentation_with_eol! {
|
|
test_indentation_windows_eol: WINDOWS_EOL,
|
|
test_indentation_mac_eol: MAC_EOL,
|
|
test_indentation_unix_eol: UNIX_EOL,
|
|
}
|
|
|
|
macro_rules! test_double_dedent_with_eol {
|
|
($($name:ident: $eol:expr,)*) => {
|
|
$(
|
|
#[test]
|
|
fn $name() {
|
|
let source = format!("def foo():{} if x:{}{} return 99{}{}", $eol, $eol, $eol, $eol, $eol);
|
|
let tokens = lex_source(&source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Def,
|
|
Tok::Name {
|
|
name: String::from("foo"),
|
|
},
|
|
Tok::Lpar,
|
|
Tok::Rpar,
|
|
Tok::Colon,
|
|
Tok::Newline,
|
|
Tok::Indent,
|
|
Tok::If,
|
|
Tok::Name {
|
|
name: String::from("x"),
|
|
},
|
|
Tok::Colon,
|
|
Tok::Newline,
|
|
Tok::Indent,
|
|
Tok::Return,
|
|
Tok::Int { value: BigInt::from(99) },
|
|
Tok::Newline,
|
|
Tok::Dedent,
|
|
Tok::Dedent,
|
|
]
|
|
);
|
|
}
|
|
)*
|
|
}
|
|
}
|
|
|
|
macro_rules! test_double_dedent_with_tabs {
|
|
($($name:ident: $eol:expr,)*) => {
|
|
$(
|
|
#[test]
|
|
fn $name() {
|
|
let source = format!("def foo():{}\tif x:{}{}\t return 99{}{}", $eol, $eol, $eol, $eol, $eol);
|
|
let tokens = lex_source(&source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Def,
|
|
Tok::Name {
|
|
name: String::from("foo"),
|
|
},
|
|
Tok::Lpar,
|
|
Tok::Rpar,
|
|
Tok::Colon,
|
|
Tok::Newline,
|
|
Tok::Indent,
|
|
Tok::If,
|
|
Tok::Name {
|
|
name: String::from("x"),
|
|
},
|
|
Tok::Colon,
|
|
Tok::Newline,
|
|
Tok::Indent,
|
|
Tok::Return,
|
|
Tok::Int { value: BigInt::from(99) },
|
|
Tok::Newline,
|
|
Tok::Dedent,
|
|
Tok::Dedent,
|
|
]
|
|
);
|
|
}
|
|
)*
|
|
}
|
|
}
|
|
|
|
test_double_dedent_with_eol! {
|
|
test_double_dedent_windows_eol: WINDOWS_EOL,
|
|
test_double_dedent_mac_eol: MAC_EOL,
|
|
test_double_dedent_unix_eol: UNIX_EOL,
|
|
}
|
|
|
|
test_double_dedent_with_tabs! {
|
|
test_double_dedent_tabs_windows_eol: WINDOWS_EOL,
|
|
test_double_dedent_tabs_mac_eol: MAC_EOL,
|
|
test_double_dedent_tabs_unix_eol: UNIX_EOL,
|
|
}
|
|
|
|
macro_rules! test_newline_in_brackets {
|
|
($($name:ident: $eol:expr,)*) => {
|
|
$(
|
|
#[test]
|
|
fn $name() {
|
|
let source = format!("x = [{} 1,2{}]{}", $eol, $eol, $eol);
|
|
let tokens = lex_source(&source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::Name {
|
|
name: String::from("x"),
|
|
},
|
|
Tok::Equal,
|
|
Tok::Lsqb,
|
|
Tok::Int { value: BigInt::from(1) },
|
|
Tok::Comma,
|
|
Tok::Int { value: BigInt::from(2) },
|
|
Tok::Rsqb,
|
|
Tok::Newline,
|
|
]
|
|
);
|
|
}
|
|
)*
|
|
};
|
|
}
|
|
|
|
test_newline_in_brackets! {
|
|
test_newline_in_brackets_windows_eol: WINDOWS_EOL,
|
|
test_newline_in_brackets_mac_eol: MAC_EOL,
|
|
test_newline_in_brackets_unix_eol: UNIX_EOL,
|
|
}
|
|
|
|
#[test]
|
|
fn test_operators() {
|
|
let source = "//////=/ /";
|
|
let tokens = lex_source(source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::DoubleSlash,
|
|
Tok::DoubleSlash,
|
|
Tok::DoubleSlashEqual,
|
|
Tok::Slash,
|
|
Tok::Slash,
|
|
Tok::Newline,
|
|
]
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_string() {
|
|
let source = r#""double" 'single' 'can\'t' "\\\"" '\t\r\n' '\g' r'raw\'' '\420' '\200\0a'"#;
|
|
let tokens = lex_source(source);
|
|
assert_eq!(
|
|
tokens,
|
|
vec![
|
|
Tok::String {
|
|
value: String::from("double"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("single"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("can't"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("\\\""),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("\t\r\n"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("\\g"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("raw\\'"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("Đ"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::String {
|
|
value: String::from("\u{80}\u{0}a"),
|
|
is_fstring: false,
|
|
},
|
|
Tok::Newline,
|
|
]
|
|
);
|
|
}
|
|
|
|
macro_rules! test_string_continuation {
|
|
($($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
|
|
]
|
|
)
|
|
}
|
|
}
|