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use super::*;
use std::str::FromStr;
use std::{borrow::Borrow, error::Error, f64::consts};
use thiserror::Error;
#[derive(Error, Debug)]
pub enum ParseError {
#[error("\"{0}\" has prohibited characters")]
ProhibitedCharacters(String),
#[error("Tokens containing colons must be of type Range")]
NotRangeType,
}
fn parse_26ary_number(chars: Vec<char>) -> usize {
let mut i = 0;
let mut x = 0;
while let Some(&c) = chars.get(i) {
x = x * 26 + c as usize - 'A' as usize + 1;
i += 1;
}
x
}
pub fn parse(primitive_tokens: Vec<PrimitiveToken>) -> Result<Vec<Token>, Box<dyn Error>> {
let mut tokens = vec![];
for token in primitive_tokens {
tokens.push(match token {
PrimitiveToken::Parsed(token) => token,
PrimitiveToken::Raw(raw_string) => match raw_string.as_str() {
"true" => Token::Boolean(true),
"false" => Token::Boolean(false),
"inf" => Token::Float(f64::INFINITY),
"NaN" => Token::Float(f64::NAN),
"e" => Token::Float(consts::E),
"pi" => Token::Float(consts::PI),
"tau" => Token::Float(consts::TAU),
"ref" => Token::FnRef,
"sum" => Token::FnSum,
"avg" => Token::FnAvg,
"if" => Token::FnIf,
"round" => Token::FnRound,
"floor" => Token::FnFloor,
"ceil" => Token::FnCeil,
"log" => Token::FnLog,
"ln" => Token::FnLn,
"log2" => Token::FnLog2,
"log10" => Token::FnLog10,
"sqrt" => Token::FnSqrt,
"pow" => Token::FnPow,
"sin" => Token::FnSin,
"cos" => Token::FnCos,
"tan" => Token::FnTan,
"asin" => Token::FnAsin,
"acos" => Token::FnAcos,
"atan" => Token::FnAtan,
"sinh" => Token::FnSinh,
"cosh" => Token::FnCosh,
"tanh" => Token::FnTanh,
"asinh" => Token::FnAsinh,
"acosh" => Token::FnAcosh,
"atanh" => Token::FnAtanh,
raw_string => {
if raw_string.contains('.') {
Token::Float(f64::from_str(raw_string)?)
} else if raw_string.contains(':') {
let chars: Vec<char> = raw_string.chars().collect();
let mut x1 = vec![];
let mut y1 = vec![];
let mut x2 = vec![];
let mut y2 = vec![];
let mut i = 0;
while let Some(&c) = chars.get(i) {
if !matches!(c, 'A'..='Z') {
break;
}
x1.push(c);
i += 1;
}
while let Some(&c) = chars.get(i) {
if !matches!(c, '0'..='9') {
break;
}
y1.push(c);
i += 1;
}
i += 1;
while let Some(&c) = chars.get(i) {
if !matches!(c, 'A'..='Z') {
break;
}
x2.push(c);
i += 1;
}
while let Some(&c) = chars.get(i) {
if !matches!(c, '0'..='9') {
break;
}
y2.push(c);
i += 1;
}
if x1.len() == 0 || y1.len() == 0 || x2.len() == 0 || y2.len() == 0 {
return Err(Box::new(ParseError::NotRangeType));
}
let x1 = parse_26ary_number(x1);
let y1 = usize::from_str(y1.iter().collect::<String>().as_str())?;
let x2 = parse_26ary_number(x2);
let y2 = usize::from_str(y2.iter().collect::<String>().as_str())?;
Token::Range(x1 - 1, y1 - 1, x2 - 1, y2 - 1)
} else {
let chars: Vec<char> = raw_string.chars().collect();
match chars[0] {
'0' => Token::Integer(match chars.get(1) {
Some('b') => i64::from_str_radix(raw_string[2..].borrow(), 2)?,
Some('x') => i64::from_str_radix(raw_string[2..].borrow(), 16)?,
Some(_) => i64::from_str_radix(raw_string, 8)?,
None => 0,
}),
'1'..='9' => Token::Integer(i64::from_str(raw_string)?),
'a'..='z' | '_' => {
if chars.iter().all(|char| {
char.is_ascii_alphabetic() || char.is_digit(10) || *char == '_'
}) {
Token::Var(raw_string.to_string())
} else {
return Err(Box::new(ParseError::ProhibitedCharacters(
raw_string.to_string(),
)));
}
}
'A'..='Z' => {
let mut i = 0;
let mut x = vec![];
while let Some(&c) = chars.get(i) {
if !matches!(c, 'A'..='Z') {
break;
}
x.push(c);
i += 1;
}
let x = parse_26ary_number(x);
if i < raw_string.len() {
let raw_string = chars[i..].iter().collect::<String>();
if let Ok(y) = usize::from_str(raw_string.as_str()) {
Token::Ref(x - 1, y - 1)
} else if chars[i..].iter().all(|char| {
char.is_ascii_alphabetic()
|| char.is_digit(10)
|| *char == '_'
}) {
Token::Var(raw_string)
} else {
return Err(Box::new(ParseError::ProhibitedCharacters(
raw_string,
)));
}
} else {
Token::Var(raw_string.to_string())
}
}
_ => {
return Err(Box::new(ParseError::ProhibitedCharacters(
raw_string.to_string(),
)))
}
}
}
}
},
});
}
tokens.reverse();
Ok(tokens)
}