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Scan integers

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Araozu 2022-11-21 16:58:51 -05:00
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1
src/main.rs
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@ -2,6 +2,7 @@ use std::io;
use chrono::{prelude::Utc, Datelike}; use chrono::{prelude::Utc, Datelike};
mod repl; mod repl;
mod syntax;
const VERSION: &str = "0.0.1"; const VERSION: &str = "0.0.1";

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src/repl/mod.rs
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@ -1,5 +1,11 @@
use std::io::{self, Write}; use std::io::{self, Write};
use super::syntax;
fn compile(input: &String) {
let tokens = syntax::get_tokens(input);
}
pub fn run() -> io::Result<()> { pub fn run() -> io::Result<()> {
let stdin = io::stdin(); let stdin = io::stdin();
let mut buffer = String::new(); let mut buffer = String::new();
@ -8,19 +14,21 @@ pub fn run() -> io::Result<()> {
loop { loop {
print!("> "); print!("> ");
let _ = io::stdout().flush(); let _ = io::stdout().flush();
buffer.clear();
let read = stdin.read_line(&mut buffer); let read = stdin.read_line(&mut buffer);
match read { match read {
Ok(0) => { Ok(0) => {
println!("\nBye"); println!("\nBye");
return Ok(()); break Ok(())
}, },
Ok(_) => { Ok(_) => {
println!("{}", buffer); println!("{}", buffer);
compile(&buffer);
}, },
Err(error) => { Err(error) => {
eprintln!("Error reading stdin."); eprintln!("Error reading stdin.");
return Err(error); break Err(error)
} }
}; };
} }

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src/syntax/mod.rs Normal file
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mod utils;
mod scanner;
mod token;
use token::{Token, TokenType};
type Chars = Vec<char>;
/// Scans and returns all the tokens in the input String
pub fn get_tokens(input: &String) -> Vec<Token> {
let chars: Vec<char> = input.chars().into_iter().collect();
let mut results = Vec::new();
let mut current_pos: usize = 0;
while has_input(&chars, current_pos) {
let (possible_token, next_pos) = next_token(&chars, current_pos);
current_pos = next_pos;
if let Some(token) = possible_token {
results.push(token);
}
}
results.push(token::new_eof(0));
results
}
fn next_token(chars: &Chars, current_pos: usize) -> (Option<Token>, usize) {
let next_char = peek(chars, current_pos);
// Handle whitespace
if next_char == ' ' {
return next_token(chars, current_pos + 1)
}
// Test number
if utils::is_digit(next_char) {
let (token, next_pos) = scanner::number(chars, current_pos);
(Some(token), next_pos)
} else {
(None, current_pos)
}
}
fn peek(input: &Chars, pos: usize) -> char {
let result = input.get(pos).unwrap_or(&'\0');
*result
}
fn has_input(input: &Vec<char>, current_pos: usize) -> bool {
input.len() < current_pos
}
#[cfg(test)]
mod tests {
use super::*;
use token::{Token, TokenType};
/// Should return an EOF token if the input has no tokens
#[test]
fn test1() {
let input = String::from("");
let tokens = get_tokens(&input);
assert_eq!(1, tokens.len());
let first = tokens.get(0).unwrap();
assert_eq!(TokenType::EOF, first.token_type);
let input = String::from(" ");
let tokens = get_tokens(&input);
assert_eq!(1, tokens.len());
let first = tokens.get(0).unwrap();
assert_eq!(TokenType::EOF, first.token_type);
let input = String::from(" \n ");
let tokens = get_tokens(&input);
assert_eq!(1, tokens.len());
let first = tokens.get(0).unwrap();
assert_eq!(TokenType::EOF, first.token_type);
}
/// Should scan numbers
#[test]
fn number_test() {
let input = String::from("126 278.98 0.282398 1798e+1 239.3298e-103");
let tokens = get_tokens(&input);
// assert_eq!("126", tokens.get(0).unwrap().value);
/*
assert_eq!("278.98", tokens.get(1).unwrap().value);
assert_eq!("0.282398", tokens.get(2).unwrap().value);
assert_eq!("1798e+1", tokens.get(3).unwrap().value);
assert_eq!("239.3298e-103", tokens.get(4).unwrap().value);
assert_eq!(TokenType::EOF, tokens.get(5).unwrap().token_type);
*/
}
}

8
src/syntax/scanner/mod.rs Normal file
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@ -0,0 +1,8 @@
use super::token::Token;
mod number;
pub fn number(chars: &Vec<char>, start_pos: usize) -> (Token, usize) {
number::scan(chars, start_pos)
}

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src/syntax/scanner/number.rs Normal file
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@ -0,0 +1,62 @@
use crate::syntax::{token::{Token, self}, utils};
pub fn scan(chars: &Vec<char>, start_pos: usize) -> (Token, usize) {
scan_decimal(chars, start_pos, String::from(""))
}
fn scan_decimal(chars: &Vec<char>, start_pos: usize, current: String) -> (Token, usize) {
let next_char = chars.get(start_pos);
if let Some(c) = next_char {
if utils::is_digit(*c) {
let new_value = format!("{}{}", current, *c);
scan_decimal(chars, start_pos + 1, new_value)
} else {
(token::new_number(current, start_pos as i32), start_pos)
}
} else {
(token::new_number(current, start_pos as i32), start_pos)
}
}
#[cfg(test)]
mod tests {
use crate::syntax::token::TokenType;
use super::*;
fn str_to_vec(s: &str) -> Vec<char> {
s.chars().collect()
}
#[test]
fn test_int() {
let input = str_to_vec("123");
let start_pos = 0;
let (token, next) = scan(&input, start_pos);
assert_eq!(3, next);
assert_eq!(TokenType::Number, token.token_type);
assert_eq!("123", token.value);
let input = str_to_vec("0123");
let start_pos = 0;
let (token, next) = scan(&input, start_pos);
assert_eq!(4, next);
assert_eq!(TokenType::Number, token.token_type);
assert_eq!("0123", token.value);
let input = str_to_vec(" 123456 789");
let start_pos = 2;
let (token, next) = scan(&input, start_pos);
assert_eq!(8, next);
assert_eq!(TokenType::Number, token.token_type);
assert_eq!("123456", token.value);
}
}

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src/syntax/token.rs Normal file
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@ -0,0 +1,46 @@
#[derive(PartialEq, Debug)]
pub enum TokenType {
NewLine,
Identifier,
Comment,
Number,
String,
Unit,
Operator,
LeftParen,
RightParen,
LeftBracket,
RightBracket,
LeftBrace,
RightBrace,
Indent,
Dedent,
VAR,
VAL,
EOF,
}
pub struct Token {
pub token_type: TokenType,
// The token as a raw string
pub value: String,
/// The absolute position of this token, from the
/// start of the file
position: i32,
}
pub fn new_eof(position: i32) -> Token {
Token {
token_type: TokenType::EOF,
value: String::from(""),
position,
}
}
pub fn new_number(value: String, position: i32) -> Token {
Token {
token_type: TokenType::Number,
value,
position
}
}

6
src/syntax/utils.rs Normal file
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@ -0,0 +1,6 @@
pub fn is_digit(c: char) -> bool {
'0' <= c && c <= '9'
}