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use crate::file_error;
use crate::lexer::Token;
use regex::Regex;
use std::collections::HashMap;
use std::ops::Range;
#[derive(Debug, Clone)]
pub struct Name {
pub regex: Regex,
pub variables: Vec<String>,
}
pub fn parse(
tokens: Vec<(Token, Range<usize>)>,
file: String,
content: String,
) -> Vec<(Name, Vec<Token>)> {
let mut list = Vec::new();
let mut token = tokens.iter();
while let Some(next) = token.next() {
match next.0 {
Token::String(_) => {
let mut name = vec![next.clone()];
let mut last = next;
for i in token.by_ref() {
last = i;
if i.0 != Token::ConvertTo {
name.push(i.clone());
} else {
break;
}
}
let mut variables: Vec<String> = Vec::new();
let mut regex = "^".to_string();
let mut name_iter = name.iter();
while let Some(i) = name_iter.next() {
regex.push_str(
match &i.0 {
Token::ReplacementStart => {
let next = name_iter.next().unwrap_or_else(|| {
file_error!(
file,
content.clone(),
i.1.end..i.1.end + 1,
"Unexpected end of file"
)
});
if let Token::String(x) = &next.0 {
if variables.contains(x) {
file_error!(
file,
content.clone(),
next.1,
"Cant have 2 varibales that have the same name"
)
}
variables.push(x.to_string());
let next_name = name_iter.next().unwrap_or_else(|| {
file_error!(
file,
content.clone(),
next.1.end..next.1.end + 1,
"Unexpected end of file"
)
});
if next_name.0 != Token::ReplacementEnd {
file_error!(
file,
content.clone(),
next_name.1,
"Unexpected token in name"
);
}
} else if Token::ReplacementEnd == next.0 {
if variables.contains(&"".to_string()) {
file_error!(
file,
content.clone(),
next.1,
"Cant have 2 varibales that have the same name"
)
}
variables.push("".to_string())
} else {
file_error!(
file,
content.clone(),
next.1,
"Unexpected token, expected a string"
)
}
"(.*)".to_string()
}
Token::Add => "+".to_string(),
Token::Subtract => r"\-".to_string(),
Token::Times => r"\*".to_string(),
Token::Divide => "/".to_string(),
Token::Number(x) => regex::escape(x.to_string().as_str()),
Token::String(x) => regex::escape(x),
_ => file_error!(file, content, i.1, "Unexpected token in name"),
}
.as_str(),
);
}
regex.push('$');
let first = &token
.next()
.unwrap_or_else(|| {
file_error!(
file,
content.clone(),
last.1.end..last.1.end + 1,
"Unexpected end of file"
)
})
.0;
let mut convert_to = Vec::new();
let go_to = match first {
Token::MultiEqualStart => Token::MultiEqualEnd,
_ => {
convert_to.push(first.clone());
Token::NewLine
}
};
let mut broke = false;
for i in token.by_ref() {
last = i;
if i.0 != go_to {
if !matches!(
i.0,
Token::ReplacementStart
| Token::ReplacementEnd
| Token::Add
| Token::Subtract
| Token::Times
| Token::Divide
| Token::Number(_)
| Token::String(_)
| Token::SemiColon
| Token::NewLine
) {
file_error!(file, content, i.1, "Unexpected token in converts to");
}
convert_to.push(i.0.clone());
} else {
broke = true;
break;
}
}
if !broke {
file_error!(
file,
content.clone(),
last.1.end..last.1.end + 1,
"Unexpected end of file"
)
}
list.push((
Name {
regex: Regex::new(®ex)
.expect("Internal error, could not make regex from input"),
variables,
},
convert_to,
));
}
_ => {
file_error!(file, content, next.1, "Unexpected Token");
}
}
}
list
}
pub fn converts(parsed: Vec<(Name, Vec<Token>)>, input: String) -> Option<String> {
for i in parsed {
if let Some(caps) = i.0.regex.captures(&input) {
let mut caps_iter = caps.iter();
caps_iter.next();
let mut variables = HashMap::new();
for x in i.0.variables {
variables.insert(
x,
caps_iter
.next()
.unwrap_or_else(|| {
panic!("Internal Error\ninput: {input}\nregex: {:?}", i.0.regex)
})
.unwrap_or_else(|| {
panic!("Internal Error\ninput: {input}\nregex: {}", i.0.regex)
})
.as_str()
.to_string(),
);
}
let mut returns = String::new();
let mut returns_iter = i.1.iter();
while let Some(x) = returns_iter.next() {
returns.push_str(
match x {
Token::ReplacementStart => {
let next = returns_iter
.next()
.expect("Should never happen but failed to get value");
if next == &Token::ReplacementEnd {
(*variables.get("").unwrap_or_else(|| {
panic!("Internal Error\nCould not find variable \"\" in {:?}",
i.1)
})).clone().to_string()
} else {
let mut next_value = false;
let value = match next {
Token::String(w) => (*variables.get(w).unwrap_or_else(|| {
panic!("Internal Error\nCould not find variable \"{}\" in {:?}", w, i.1)})).to_string().clone(),
Token::Number(n) => n.to_string(),
Token::Add => {
next_value = true;
(*variables.get("").unwrap_or_else(|| {
panic!("Internal Error\nCould not find variable \"\" in {:?}", i.1)})).to_string().clone()
},
Token::Subtract => {
next_value = true;
(*variables.get("").unwrap_or_else(|| {
panic!("Internal Error\nCould not find variable \"\" in {:?}", i.1)})).to_string().clone()
},
Token::Times => {
next_value = true;
(*variables.get("").unwrap_or_else(|| {
panic!("Internal Error\nCould not find variable \"\" in {:?}", i.1)})).to_string().clone()
},
Token::Divide => {
next_value = true;
(*variables.get("").unwrap_or_else(|| {
panic!("Internal Error\nCould not find variable \"\" in {:?}", i.1)})).to_string().clone()
},
_ => panic!("Internal Error\nDont know what {:?} is in {:?}", next, i.1),
};
if returns_iter.len() > 0 {
let mut int_value = value.parse::<f64>().unwrap_or_else(|_| {panic!("Internal Error\nCant do multipul things to a string, \"{}\", in {:?}", value, i.1)});
if next_value {
let next_value = match returns_iter
.next()
.expect("Internal Error\nCould nothing after a \"+\" \"-\" \"*\" \"/\"") {
Token::String(w) => variables.get(w).unwrap_or_else(|| {
panic!("Internal Error\nCould not find variable \"{}\" in {:?}", w, i.1)})
.parse::<f64>().unwrap_or_else(|_| {
panic!("Internal Error\nCould not convert variable \"{}\" in {:?} to f64", w, i.1)}),
Token::Number(w) => *w,
_ => panic!("Internal Error\nCould not find out what char is requested for"),
};
match next {
Token::Add => int_value+=next_value,
Token::Subtract => int_value-=next_value,
Token::Times => int_value*=next_value,
Token::Divide => int_value/=next_value,
_ => panic!("Internal Error\nUsed a token not able to use in replacement"),
}
}
while let Some(y) = returns_iter.next() {
if y == &Token::ReplacementEnd {
break;
}
let next = match returns_iter
.next()
.expect("Internal Error\nCould nothing after a \"+\" \"-\" \"*\" \"/\"") {
Token::String(w) => variables.get(w).unwrap_or_else(|| {
panic!("Internal Error\nCould not find variable \"{}\" in {:?}", w, i.1)})
.parse::<f64>().unwrap_or_else(|_| {
panic!("Internal Error\nCould not convert variable \"{}\" in {:?} to f64", w, i.1)}),
Token::Number(w) => *w,
_ => panic!("Internal Error\nCould not find out what char is requested for"),
};
match y {
Token::Add => int_value+=next,
Token::Subtract => int_value-=next,
Token::Times => int_value*=next,
Token::Divide => int_value/=next,
_ => panic!("Internal Error\nUsed a token not able to use in replacement"),
}
}
int_value.to_string()
}
else {
value
}
}
}
Token::Add => "+".to_string(),
Token::Subtract => r"\-".to_string(),
Token::Times => r"\*".to_string(),
Token::Divide => "/".to_string(),
Token::Number(x) => x.to_string(),
Token::String(x) => x.clone(),
Token::SemiColon => ";".to_string(),
Token::NewLine => ";".to_string(),
_ => "".to_string(),
}
.as_str(),
)
}
if !returns.ends_with(';') {
returns.push(';');
}
return Some(returns);
}
}
None
}