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math::parse(line.trim()); + println!("{:?}", parsed); + + prompt()?; + } + + Ok(()) +} + +fn prompt() -> io::Result<()> { + if io::stdin().is_terminal() { + print!("> "); + io::stdout().flush()?; + } + Ok(()) } diff --git a/src/math/lexer.rs b/src/math/lexer.rs new file mode 100644 index 0000000..2d0a005 --- /dev/null +++ b/src/math/lexer.rs @@ -0,0 +1,106 @@ +use std::str::FromStr; + +use crate::math::types::Operator; +use rust_decimal::Decimal; + +#[derive(Debug)] +pub enum Token { + Number(Decimal), + Identifier(String), + Operator(Operator), + OpenParen, + CloseParen, + Eof, +} + +pub fn from(source: &str) -> Lexer<'_> { + Lexer::new(source) +} + +pub struct Lexer<'a> { + chars: std::iter::Peekable>, +} + +impl<'a> Lexer<'a> { + fn new(source: &'a str) -> Self { + Self { + chars: source.chars().peekable(), + } + } + + fn skip_whitespace(&mut self) { + while let Some(&ch) = self.chars.peek() { + if ch.is_whitespace() { + self.chars.next(); + continue; + } + break; + } + } + + fn parse_number(&mut self, initial: char) -> Token { + let mut number = String::from(initial); + while let Some(&ch) = self.chars.peek() { + if ch.is_numeric() || ch == '.' { + number.push(ch); + self.chars.next(); + continue; + } + break; + } + + let number = Decimal::from_str(&number).expect("unable to parse number"); + Token::Number(number) + } + + fn parse_identifier(&mut self, initial: char) -> Token { + let mut identifier = String::from(initial); + while let Some(&ch) = self.chars.peek() { + if ch.is_alphabetic() { + identifier.push(ch); + self.chars.next(); + continue; + } + break; + } + + Token::Identifier(identifier) + } + + pub fn next_token(&mut self) -> Token { + self.skip_whitespace(); + + match self.chars.next() { + Some('(') => Token::OpenParen, + Some(')') => Token::CloseParen, + Some('+') => Token::Operator(Operator::Add), + Some('-') => Token::Operator(Operator::Subtract), + Some('*') => Token::Operator(Operator::Multiply), + Some('/') => Token::Operator(Operator::Divide), + Some('%') => Token::Operator(Operator::Modulo), + Some('^') => Token::Operator(Operator::Power), + None => Token::Eof, + Some(ch) => { + if ch.is_numeric() || ch == '.' { + self.parse_number(ch) + } else if ch.is_alphabetic() { + self.parse_identifier(ch) + } else { + panic!("unexpected character: {}", ch); + } + } + } + } +} + +impl<'a> Iterator for Lexer<'a> { + type Item = Token; + + fn next(&mut self) -> Option { + let token = self.next_token(); + match token { + Token::Eof => None, + _ => Some(token), + } + } +} diff --git a/src/math/mod.rs b/src/math/mod.rs new file mode 100644 index 0000000..0ce4f14 --- /dev/null +++ b/src/math/mod.rs @@ -0,0 +1,8 @@ +mod lexer; + +pub mod types; + +pub fn parse(source: &str) -> Vec { + let lexer = lexer::from(source); + lexer.collect() +} diff --git a/src/math/types.rs b/src/math/types.rs new file mode 100644 index 0000000..885f26f --- /dev/null +++ b/src/math/types.rs @@ -0,0 +1,21 @@ +use rust_decimal::Decimal; + +#[derive(Debug)] +pub enum Expression { + Number(Decimal), + Fraction(Box, Box), + Variable(String), + Operation(Operator, Box, Box), + Negative(Box), + Function(String, Vec), +} + +#[derive(Debug)] +pub enum Operator { + Add, + Subtract, + Multiply, + Divide, + Power, + Modulo, +}