895 lines
29 KiB
Rust
895 lines
29 KiB
Rust
use crate::rug::Integer;
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use lexical::parse_lossy;
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use ordered_float::*;
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use crate::ast::*;
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use crate::tabled_rc::*;
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use std::convert::TryFrom;
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use std::fmt;
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use std::io::Read;
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use std::rc::Rc;
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macro_rules! is_not_eof {
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($c:expr) => {
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match $c {
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Ok(c) => c,
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Err($crate::ast::ParserError::UnexpectedEOF) => return Ok(true),
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Err(e) => return Err(e),
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}
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};
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}
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macro_rules! consume_chars_with {
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($token:expr, $e:expr) => {
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loop {
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match $e {
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Ok(Some(c)) => $token.push(c),
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Ok(None) => continue,
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Err($crate::ast::ParserError::UnexpectedChar(..)) => break,
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Err(e) => return Err(e),
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}
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}
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};
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}
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#[derive(Debug, Clone)]
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pub enum Token {
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Constant(Constant),
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Var(Rc<Atom>),
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Open, // '('
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OpenCT, // '('
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Close, // ')'
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OpenList, // '['
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CloseList, // ']'
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OpenCurly, // '{'
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CloseCurly, // '}'
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HeadTailSeparator, // '|'
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Comma, // ','
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End,
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}
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impl Token {
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#[inline]
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pub(super) fn is_end(&self) -> bool {
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if let Token::End = self {
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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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}
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pub struct Lexer<'a, R: Read> {
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pub(crate) atom_tbl: TabledData<Atom>,
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pub(crate) reader: &'a mut ParsingStream<R>,
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pub(crate) flags: MachineFlags,
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pub(crate) line_num: usize,
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pub(crate) col_num: usize,
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}
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impl<'a, R: Read + fmt::Debug> fmt::Debug for Lexer<'a, R> {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.debug_struct("Lexer")
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.field("atom_tbl", &self.atom_tbl)
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.field("reader", &"&'a mut ParsingStream<R>") // Hacky solution.
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.field("line_num", &self.line_num)
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.field("col_num", &self.col_num)
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.finish()
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}
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}
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impl<'a, R: Read> Lexer<'a, R> {
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pub fn new(
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atom_tbl: TabledData<Atom>,
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flags: MachineFlags,
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src: &'a mut ParsingStream<R>,
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) -> Self {
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Lexer {
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atom_tbl,
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flags,
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reader: src,
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line_num: 0,
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col_num: 0,
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}
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}
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fn return_char(&mut self, c: char) {
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if new_line_char!(c) {
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self.line_num -= 1;
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self.col_num = 0;
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}
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self.reader.put_back(Ok(c));
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}
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fn skip_char(&mut self) -> Result<char, ParserError> {
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if let Some(Ok(c)) = self.reader.next() {
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self.col_num += 1;
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if new_line_char!(c) {
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self.line_num += 1;
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self.col_num = 0;
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}
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Ok(c)
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} else {
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Err(ParserError::UnexpectedEOF)
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}
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}
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pub fn eof(&mut self) -> Result<bool, ParserError> {
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if self.reader.peek().is_none() {
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return Ok(true);
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}
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let mut c = is_not_eof!(self.lookahead_char());
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while layout_char!(c) {
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self.skip_char()?;
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if self.reader.peek().is_none() {
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return Ok(true);
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}
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c = is_not_eof!(self.lookahead_char());
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}
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Ok(false)
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}
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pub fn lookahead_char(&mut self) -> Result<char, ParserError> {
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match self.reader.peek() {
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Some(&Ok(c)) => Ok(c),
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_ => Err(ParserError::UnexpectedEOF),
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}
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}
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fn single_line_comment(&mut self) -> Result<(), ParserError> {
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loop {
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if self.reader.peek().is_none() || new_line_char!(self.skip_char()?) {
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break;
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}
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}
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Ok(())
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}
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fn bracketed_comment(&mut self) -> Result<bool, ParserError> {
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// we have already checked that the current lookahead_char is comment_1_char, just skip it
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let c = self.skip_char()?;
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if comment_2_char!(self.lookahead_char()?) {
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self.skip_char()?;
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// Keep reading until we find characters '*' and '/'
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// Deliberately skip checks for prolog_char to allow comments to contain any characters,
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// including so-called "extended characters", without having to explicitly add them to a character class.
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let mut c = self.lookahead_char()?;
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loop {
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while !comment_2_char!(c) {
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self.skip_char()?;
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c = self.lookahead_char()?;
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}
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self.skip_char()?;
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c = self.lookahead_char()?;
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if comment_1_char!(c) {
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break;
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}
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}
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if prolog_char!(c) {
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self.skip_char()?;
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Ok(true)
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} else {
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Err(ParserError::NonPrologChar(self.line_num, self.col_num))
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}
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} else {
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self.return_char(c);
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Ok(false)
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}
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}
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fn get_back_quoted_char(&mut self) -> Result<char, ParserError> {
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if back_quote_char!(self.lookahead_char()?) {
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let c = self.skip_char()?;
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if !back_quote_char!(self.lookahead_char()?) {
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self.return_char(c);
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Err(ParserError::UnexpectedChar(c, self.line_num, self.col_num))
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} else {
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self.skip_char()
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}
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} else if single_quote_char!(self.lookahead_char()?) {
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self.skip_char()
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} else {
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self.get_non_quote_char()
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}
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}
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fn get_back_quoted_item(&mut self) -> Result<Option<char>, ParserError> {
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if backslash_char!(self.lookahead_char()?) {
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let c = self.skip_char()?;
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if new_line_char!(self.lookahead_char()?) {
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self.skip_char()?;
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Ok(None)
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} else {
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self.return_char(c);
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Err(ParserError::UnexpectedChar(c, self.line_num, self.col_num))
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}
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} else {
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self.get_back_quoted_char().map(Some)
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}
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}
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fn get_back_quoted_string(&mut self) -> Result<String, ParserError> {
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let c = self.lookahead_char()?;
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if back_quote_char!(c) {
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self.skip_char()?;
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let mut token = String::new();
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consume_chars_with!(token, self.get_back_quoted_item());
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if back_quote_char!(self.lookahead_char()?) {
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self.skip_char()?;
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Ok(token)
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} else {
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Err(ParserError::MissingQuote(self.line_num, self.col_num))
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}
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} else {
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Err(ParserError::UnexpectedChar(c, self.line_num, self.col_num))
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}
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}
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fn get_single_quoted_item(&mut self) -> Result<Option<char>, ParserError> {
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if backslash_char!(self.lookahead_char()?) {
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let c = self.skip_char()?;
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if new_line_char!(self.lookahead_char()?) {
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self.skip_char()?;
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return Ok(None);
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} else {
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self.return_char(c);
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}
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}
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self.get_single_quoted_char().map(Some)
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}
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fn get_single_quoted_char(&mut self) -> Result<char, ParserError> {
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let c = self.lookahead_char()?;
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if single_quote_char!(c) {
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self.skip_char()?;
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if !single_quote_char!(self.lookahead_char()?) {
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self.return_char(c);
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Err(ParserError::UnexpectedChar(c, self.line_num, self.col_num))
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} else {
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self.skip_char()
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}
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} else if double_quote_char!(c) || back_quote_char!(c) {
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self.skip_char()
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} else {
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self.get_non_quote_char()
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}
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}
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fn get_double_quoted_item(&mut self) -> Result<Option<char>, ParserError> {
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if backslash_char!(self.lookahead_char()?) {
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let c = self.skip_char()?;
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if new_line_char!(self.lookahead_char()?) {
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self.skip_char()?;
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return Ok(None);
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} else {
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self.return_char(c);
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}
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}
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self.get_double_quoted_char().map(Some)
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}
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fn get_double_quoted_char(&mut self) -> Result<char, ParserError> {
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if double_quote_char!(self.lookahead_char()?) {
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let c = self.skip_char()?;
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if !double_quote_char!(self.lookahead_char()?) {
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self.return_char(c);
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Err(ParserError::UnexpectedChar(c, self.line_num, self.col_num))
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} else {
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self.skip_char()
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}
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} else if single_quote_char!(self.lookahead_char()?) {
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self.skip_char()
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} else if back_quote_char!(self.lookahead_char()?) {
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self.skip_char()
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} else {
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self.get_non_quote_char()
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}
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}
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fn get_control_escape_sequence(&mut self) -> Result<char, ParserError> {
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let escaped = match self.lookahead_char()? {
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'a' => '\u{07}', // UTF-8 alert
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'b' => '\u{08}', // UTF-8 backspace
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'v' => '\u{0b}', // UTF-8 vertical tab
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'f' => '\u{0c}', // UTF-8 form feed
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't' => '\t',
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'n' => '\n',
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'r' => '\r',
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c => return Err(ParserError::UnexpectedChar(c, self.line_num, self.col_num)),
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};
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self.skip_char()?;
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return Ok(escaped);
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}
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fn get_octal_escape_sequence(&mut self) -> Result<char, ParserError> {
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self.escape_sequence_to_char(|c| octal_digit_char!(c), 8)
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}
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fn get_hexadecimal_escape_sequence(&mut self) -> Result<char, ParserError> {
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self.skip_char()?;
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let c = self.lookahead_char()?;
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if hexadecimal_digit_char!(c) {
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self.escape_sequence_to_char(|c| hexadecimal_digit_char!(c), 16)
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} else {
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Err(ParserError::UnexpectedChar(c, self.line_num, self.col_num))
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}
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}
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fn escape_sequence_to_char(
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&mut self,
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accept_char: impl Fn(char) -> bool,
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radix: u32,
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) -> Result<char, ParserError> {
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let mut c = self.lookahead_char()?;
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let mut token = String::new();
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loop {
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token.push(c);
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self.skip_char()?;
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c = self.lookahead_char()?;
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if !accept_char(c) {
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break;
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}
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}
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if backslash_char!(c) {
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self.skip_char()?;
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u32::from_str_radix(&token, radix).map_or_else(
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|_| Err(ParserError::ParseBigInt(self.line_num, self.col_num)),
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|n| {
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char::try_from(n)
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.map_err(|_| ParserError::Utf8Error(self.line_num, self.col_num))
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},
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)
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} else {
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// on failure, restore the token characters and backslash.
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self.reader.put_back_all(token.chars().map(Ok));
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self.reader.put_back(Ok('\\'));
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Err(ParserError::UnexpectedChar(c, self.line_num, self.col_num))
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}
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}
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fn get_non_quote_char(&mut self) -> Result<char, ParserError> {
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let c = self.lookahead_char()?;
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if graphic_char!(c) || alpha_numeric_char!(c) || solo_char!(c) || space_char!(c) {
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self.skip_char()
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} else {
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if !backslash_char!(c) {
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return Err(ParserError::UnexpectedChar(c, self.line_num, self.col_num));
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}
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self.skip_char()?;
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let c = self.lookahead_char()?;
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if meta_char!(c) {
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self.skip_char()
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} else if octal_digit_char!(c) {
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self.get_octal_escape_sequence()
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} else if symbolic_hexadecimal_char!(c) {
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self.get_hexadecimal_escape_sequence()
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} else {
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self.get_control_escape_sequence()
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}
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}
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}
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fn char_code_list_token(&mut self) -> Result<String, ParserError> {
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let mut token = String::new();
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self.skip_char()?;
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consume_chars_with!(token, self.get_double_quoted_item());
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if double_quote_char!(self.lookahead_char()?) {
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self.skip_char()?;
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Ok(token)
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} else {
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Err(ParserError::MissingQuote(self.line_num, self.col_num))
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}
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}
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fn hexadecimal_constant(&mut self) -> Result<Token, ParserError> {
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self.skip_char()?;
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if hexadecimal_digit_char!(self.lookahead_char()?) {
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let mut token = String::new();
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while hexadecimal_digit_char!(self.lookahead_char()?) {
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token.push(self.skip_char()?);
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}
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isize::from_str_radix(&token, 16)
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.map(|n| Token::Constant(Constant::Fixnum(n)))
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.or_else(|_| {
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Integer::from_str_radix(&token, 16)
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.map(|n| Token::Constant(Constant::Integer(Rc::new(n))))
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.map_err(|_| ParserError::ParseBigInt(self.line_num, self.col_num))
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})
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} else {
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self.return_char('x');
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Err(ParserError::ParseBigInt(self.line_num, self.col_num))
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}
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}
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|
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fn octal_constant(&mut self) -> Result<Token, ParserError> {
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self.skip_char()?;
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|
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if octal_digit_char!(self.lookahead_char()?) {
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let mut token = String::new();
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|
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while octal_digit_char!(self.lookahead_char()?) {
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token.push(self.skip_char()?);
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}
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isize::from_str_radix(&token, 8)
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.map(|n| Token::Constant(Constant::Fixnum(n)))
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.or_else(|_| {
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Integer::from_str_radix(&token, 8)
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.map(|n| Token::Constant(Constant::Integer(Rc::new(n))))
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.map_err(|_| ParserError::ParseBigInt(self.line_num, self.col_num))
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})
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} else {
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self.return_char('o');
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Err(ParserError::ParseBigInt(self.line_num, self.col_num))
|
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}
|
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}
|
|
|
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fn binary_constant(&mut self) -> Result<Token, ParserError> {
|
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self.skip_char()?;
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|
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if binary_digit_char!(self.lookahead_char()?) {
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let mut token = String::new();
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|
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while binary_digit_char!(self.lookahead_char()?) {
|
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token.push(self.skip_char()?);
|
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}
|
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|
|
isize::from_str_radix(&token, 2)
|
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.map(|n| Token::Constant(Constant::Fixnum(n)))
|
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.or_else(|_| {
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|
Integer::from_str_radix(&token, 2)
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.map(|n| Token::Constant(Constant::Integer(Rc::new(n))))
|
|
.map_err(|_| ParserError::ParseBigInt(self.line_num, self.col_num))
|
|
})
|
|
} else {
|
|
self.return_char('b');
|
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Err(ParserError::ParseBigInt(self.line_num, self.col_num))
|
|
}
|
|
}
|
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|
|
fn variable_token(&mut self) -> Result<Token, ParserError> {
|
|
let mut s = String::new();
|
|
s.push(self.skip_char()?);
|
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|
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while alpha_numeric_char!(self.lookahead_char()?) {
|
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s.push(self.skip_char()?);
|
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}
|
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|
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Ok(Token::Var(rc_atom!(s)))
|
|
}
|
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|
|
fn name_token(&mut self, c: char) -> Result<Token, ParserError> {
|
|
let mut token = String::new();
|
|
|
|
if small_letter_char!(c) {
|
|
token.push(self.skip_char()?);
|
|
|
|
while alpha_numeric_char!(self.lookahead_char()?) {
|
|
token.push(self.skip_char()?);
|
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}
|
|
} else if graphic_token_char!(c) {
|
|
token.push(self.skip_char()?);
|
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|
|
while graphic_token_char!(self.lookahead_char()?) {
|
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token.push(self.skip_char()?);
|
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}
|
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} else if cut_char!(c) {
|
|
token.push(self.skip_char()?);
|
|
} else if semicolon_char!(c) {
|
|
token.push(self.skip_char()?);
|
|
} else if single_quote_char!(c) {
|
|
self.skip_char()?;
|
|
|
|
consume_chars_with!(token, self.get_single_quoted_item());
|
|
|
|
if single_quote_char!(self.lookahead_char()?) {
|
|
self.skip_char()?;
|
|
|
|
if !token.is_empty() && token.chars().nth(1).is_none() {
|
|
if let Some(c) = token.chars().next() {
|
|
return Ok(Token::Constant(Constant::Char(c)));
|
|
}
|
|
}
|
|
} else {
|
|
return Err(ParserError::InvalidSingleQuotedCharacter(
|
|
self.lookahead_char()?,
|
|
));
|
|
}
|
|
} else {
|
|
match self.get_back_quoted_string() {
|
|
Ok(_) => return Err(ParserError::BackQuotedString(self.line_num, self.col_num)),
|
|
Err(e) => return Err(e),
|
|
}
|
|
}
|
|
|
|
if token.as_str() == "[]" {
|
|
Ok(Token::Constant(Constant::EmptyList))
|
|
} else {
|
|
Ok(Token::Constant(atom!(token, self.atom_tbl)))
|
|
}
|
|
}
|
|
|
|
fn vacate_with_float(&mut self, mut token: String) -> Token {
|
|
self.return_char(token.pop().unwrap());
|
|
|
|
let result = OrderedFloat(parse_lossy::<f64, _>(token.as_bytes()));
|
|
Token::Constant(Constant::Float(result))
|
|
}
|
|
|
|
pub fn number_token(&mut self) -> Result<Token, ParserError> {
|
|
let mut token = String::new();
|
|
|
|
token.push(self.skip_char()?);
|
|
let mut c = self.lookahead_char()?;
|
|
|
|
while decimal_digit_char!(c) {
|
|
token.push(c);
|
|
self.skip_char()?;
|
|
c = self.lookahead_char()?;
|
|
}
|
|
|
|
if decimal_point_char!(c) {
|
|
self.skip_char()?;
|
|
|
|
if self.reader.peek().is_none() {
|
|
self.return_char('.');
|
|
|
|
isize::from_str_radix(&token, 10)
|
|
.map(|n| Token::Constant(Constant::Fixnum(n)))
|
|
.or_else(|_| {
|
|
token
|
|
.parse::<Integer>()
|
|
.map(|n| Token::Constant(Constant::Integer(Rc::new(n))))
|
|
.map_err(|_| ParserError::ParseBigInt(self.line_num, self.col_num))
|
|
})
|
|
} else if decimal_digit_char!(self.lookahead_char()?) {
|
|
token.push('.');
|
|
token.push(self.skip_char()?);
|
|
|
|
let mut c = self.lookahead_char()?;
|
|
|
|
while decimal_digit_char!(c) {
|
|
token.push(c);
|
|
self.skip_char()?;
|
|
c = self.lookahead_char()?;
|
|
}
|
|
|
|
if exponent_char!(self.lookahead_char()?) {
|
|
token.push(self.skip_char()?);
|
|
|
|
let c = match self.lookahead_char() {
|
|
Err(_) => return Ok(self.vacate_with_float(token)),
|
|
Ok(c) => c,
|
|
};
|
|
|
|
if !sign_char!(c) && !decimal_digit_char!(c) {
|
|
return Ok(self.vacate_with_float(token));
|
|
}
|
|
|
|
if sign_char!(c) {
|
|
token.push(self.skip_char()?);
|
|
|
|
let c = match self.lookahead_char() {
|
|
Err(_) => {
|
|
self.return_char(token.pop().unwrap());
|
|
return Ok(self.vacate_with_float(token));
|
|
}
|
|
Ok(c) => c,
|
|
};
|
|
|
|
if !decimal_digit_char!(c) {
|
|
self.return_char(token.pop().unwrap());
|
|
return Ok(self.vacate_with_float(token));
|
|
}
|
|
}
|
|
|
|
if decimal_digit_char!(self.lookahead_char()?) {
|
|
token.push(self.skip_char()?);
|
|
|
|
while decimal_digit_char!(self.lookahead_char()?) {
|
|
token.push(self.skip_char()?);
|
|
}
|
|
|
|
let n = OrderedFloat(parse_lossy::<f64, _>(token.as_bytes()));
|
|
Ok(Token::Constant(Constant::Float(n)))
|
|
} else {
|
|
return Ok(self.vacate_with_float(token));
|
|
}
|
|
} else {
|
|
let n = OrderedFloat(parse_lossy::<f64, _>(token.as_bytes()));
|
|
Ok(Token::Constant(Constant::Float(n)))
|
|
}
|
|
} else {
|
|
self.return_char('.');
|
|
|
|
isize::from_str_radix(&token, 10)
|
|
.map(|n| Token::Constant(Constant::Fixnum(n)))
|
|
.or_else(|_| {
|
|
token
|
|
.parse::<Integer>()
|
|
.map(|n| Token::Constant(Constant::Integer(Rc::new(n))))
|
|
.map_err(|_| ParserError::ParseBigInt(self.line_num, self.col_num))
|
|
})
|
|
}
|
|
} else {
|
|
if token.starts_with('0') && token.len() == 1 {
|
|
if c == 'x' {
|
|
self.hexadecimal_constant().or_else(|e| {
|
|
if let ParserError::ParseBigInt(..) = e {
|
|
isize::from_str_radix(&token, 10)
|
|
.map(|n| Token::Constant(Constant::Fixnum(n)))
|
|
.or_else(|_| {
|
|
token
|
|
.parse::<Integer>()
|
|
.map(|n| Token::Constant(Constant::Integer(Rc::new(n))))
|
|
.map_err(|_| {
|
|
ParserError::ParseBigInt(self.line_num, self.col_num)
|
|
})
|
|
})
|
|
} else {
|
|
Err(e)
|
|
}
|
|
})
|
|
} else if c == 'o' {
|
|
self.octal_constant().or_else(|e| {
|
|
if let ParserError::ParseBigInt(..) = e {
|
|
isize::from_str_radix(&token, 10)
|
|
.map(|n| Token::Constant(Constant::Fixnum(n)))
|
|
.or_else(|_| {
|
|
token
|
|
.parse::<Integer>()
|
|
.map(|n| Token::Constant(Constant::Integer(Rc::new(n))))
|
|
.map_err(|_| {
|
|
ParserError::ParseBigInt(self.line_num, self.col_num)
|
|
})
|
|
})
|
|
} else {
|
|
Err(e)
|
|
}
|
|
})
|
|
} else if c == 'b' {
|
|
self.binary_constant().or_else(|e| {
|
|
if let ParserError::ParseBigInt(..) = e {
|
|
isize::from_str_radix(&token, 10)
|
|
.map(|n| Token::Constant(Constant::Fixnum(n)))
|
|
.or_else(|_| {
|
|
token
|
|
.parse::<Integer>()
|
|
.map(|n| Token::Constant(Constant::Integer(Rc::new(n))))
|
|
.map_err(|_| {
|
|
ParserError::ParseBigInt(self.line_num, self.col_num)
|
|
})
|
|
})
|
|
} else {
|
|
Err(e)
|
|
}
|
|
})
|
|
} else if single_quote_char!(c) {
|
|
self.skip_char()?;
|
|
|
|
if backslash_char!(self.lookahead_char()?) {
|
|
self.skip_char()?;
|
|
|
|
if new_line_char!(self.lookahead_char()?) {
|
|
self.return_char('\\');
|
|
self.return_char('\'');
|
|
|
|
return Ok(Token::Constant(Constant::Fixnum(0)));
|
|
} else {
|
|
self.return_char('\\');
|
|
}
|
|
}
|
|
|
|
self.get_single_quoted_char()
|
|
.map(|c| Token::Constant(Constant::Fixnum(c as isize)))
|
|
.or_else(|_| {
|
|
self.return_char(c);
|
|
|
|
isize::from_str_radix(&token, 10)
|
|
.map(|n| Token::Constant(Constant::Fixnum(n)))
|
|
.or_else(|_| {
|
|
token
|
|
.parse::<Integer>()
|
|
.map(|n| Token::Constant(Constant::Integer(Rc::new(n))))
|
|
.map_err(|_| {
|
|
ParserError::ParseBigInt(self.line_num, self.col_num)
|
|
})
|
|
})
|
|
})
|
|
} else {
|
|
isize::from_str_radix(&token, 10)
|
|
.map(|n| Token::Constant(Constant::Fixnum(n)))
|
|
.or_else(|_| {
|
|
token
|
|
.parse::<Integer>()
|
|
.map(|n| Token::Constant(Constant::Integer(Rc::new(n))))
|
|
.map_err(|_| ParserError::ParseBigInt(self.line_num, self.col_num))
|
|
})
|
|
}
|
|
} else {
|
|
isize::from_str_radix(&token, 10)
|
|
.map(|n| Token::Constant(Constant::Fixnum(n)))
|
|
.or_else(|_| {
|
|
token
|
|
.parse::<Integer>()
|
|
.map(|n| Token::Constant(Constant::Integer(Rc::new(n))))
|
|
.map_err(|_| ParserError::ParseBigInt(self.line_num, self.col_num))
|
|
})
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn scan_for_layout(&mut self) -> Result<bool, ParserError> {
|
|
let mut layout_inserted = false;
|
|
let mut more_layout = true;
|
|
|
|
loop {
|
|
let cr = self.lookahead_char();
|
|
|
|
match cr {
|
|
Ok(c) if layout_char!(c) || new_line_char!(c) => {
|
|
self.skip_char()?;
|
|
layout_inserted = true;
|
|
}
|
|
Ok(c) if end_line_comment_char!(c) => {
|
|
self.single_line_comment()?;
|
|
layout_inserted = true;
|
|
}
|
|
Ok(c) if comment_1_char!(c) => {
|
|
if self.bracketed_comment()? {
|
|
layout_inserted = true;
|
|
} else {
|
|
more_layout = false;
|
|
}
|
|
}
|
|
_ => more_layout = false,
|
|
};
|
|
|
|
if !more_layout {
|
|
break;
|
|
}
|
|
}
|
|
|
|
Ok(layout_inserted)
|
|
}
|
|
|
|
pub fn next_token(&mut self) -> Result<Token, ParserError> {
|
|
let layout_inserted = self.scan_for_layout()?;
|
|
let cr = self.lookahead_char();
|
|
|
|
match cr {
|
|
Ok(c) => {
|
|
if capital_letter_char!(c) || variable_indicator_char!(c) {
|
|
return self.variable_token();
|
|
}
|
|
|
|
if c == ',' {
|
|
self.skip_char()?;
|
|
return Ok(Token::Comma);
|
|
}
|
|
|
|
if c == ')' {
|
|
self.skip_char()?;
|
|
return Ok(Token::Close);
|
|
}
|
|
|
|
if c == '(' {
|
|
self.skip_char()?;
|
|
return Ok(if layout_inserted {
|
|
Token::Open
|
|
} else {
|
|
Token::OpenCT
|
|
});
|
|
}
|
|
|
|
if c == '.' {
|
|
self.skip_char()?;
|
|
|
|
match self.lookahead_char() {
|
|
Ok(c) if layout_char!(c) || c == '%' => {
|
|
if new_line_char!(c) {
|
|
self.skip_char()?;
|
|
}
|
|
|
|
return Ok(Token::End);
|
|
}
|
|
Err(ParserError::UnexpectedEOF) => {
|
|
return Ok(Token::End);
|
|
}
|
|
_ => {
|
|
self.return_char('.');
|
|
}
|
|
};
|
|
}
|
|
|
|
if decimal_digit_char!(c) {
|
|
return self.number_token();
|
|
}
|
|
|
|
if c == ']' {
|
|
self.skip_char()?;
|
|
return Ok(Token::CloseList);
|
|
}
|
|
|
|
if c == '[' {
|
|
self.skip_char()?;
|
|
return Ok(Token::OpenList);
|
|
}
|
|
|
|
if c == '|' {
|
|
self.skip_char()?;
|
|
return Ok(Token::HeadTailSeparator);
|
|
}
|
|
|
|
if c == '{' {
|
|
self.skip_char()?;
|
|
return Ok(Token::OpenCurly);
|
|
}
|
|
|
|
if c == '}' {
|
|
self.skip_char()?;
|
|
return Ok(Token::CloseCurly);
|
|
}
|
|
|
|
if c == '"' {
|
|
let s = self.char_code_list_token()?;
|
|
|
|
if let DoubleQuotes::Atom = self.flags.double_quotes {
|
|
let s = clause_name!(s, self.atom_tbl);
|
|
return Ok(Token::Constant(Constant::Atom(s, None)));
|
|
} else {
|
|
let s = Rc::new(s);
|
|
return Ok(Token::Constant(Constant::String(s)));
|
|
}
|
|
}
|
|
|
|
self.name_token(c)
|
|
}
|
|
Err(e) => Err(e),
|
|
}
|
|
}
|
|
}
|