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use envl_utils::{
curr_token::{CurrentToken, Push},
types::{FilePosition, Position},
};
use crate::misc::token::{Token, Value};
pub mod current_token;
pub(crate) struct Lexer {
file_path: String,
code: String,
}
impl Lexer {
pub fn new(file_path: String, code: String) -> Self {
Self { file_path, code }
}
pub fn generate(&self) -> (Vec<Token>, FilePosition) {
let mut tokens = Vec::new();
let mut row = 1;
let mut col = 1;
let mut in_quote = false;
let mut is_comment = false;
let mut is_escape = false;
let mut start_quote = char::default();
let mut current_token = CurrentToken::default();
'lexer_loop: for (i, c) in self.code.char_indices() {
let is_last = self.code.len() == (i + 1);
let mut is_others = false;
let mut file_pos = FilePosition { row, col };
let mut curr_token_pos = Position {
file_path: self.file_path.clone(),
start: current_token.start.clone(),
end: file_pos.clone(),
};
if is_comment && (c == '\n' || is_last) {
if c != '\n' && is_last {
current_token.push(c, file_pos.clone());
}
tokens.push(Token {
value: Value::Comment(current_token.token.clone().chars().skip(2).collect()),
position: if c == '\n' {
Position {
end: FilePosition { row, col: col - 1 },
..curr_token_pos.clone()
}
} else {
curr_token_pos.clone()
},
});
current_token.clear();
is_comment = false;
}
if c == '\n' {
row += 1;
col = 1;
continue;
}
file_pos = FilePosition { row, col };
curr_token_pos = Position {
file_path: self.file_path.clone(),
start: current_token.start.clone(),
end: if c.is_whitespace() {
FilePosition { row, col: col - 1 }
} else {
file_pos.clone()
},
};
let position = Position {
file_path: self.file_path.clone(),
start: file_pos.clone(),
end: file_pos.clone(),
};
if is_escape {
current_token.push(
match c {
'n' => '\n',
't' => '\t',
'r' => '\r',
'0' => '\0',
_ => c,
},
file_pos,
);
is_escape = false;
continue;
}
if (in_quote && c != start_quote) || is_comment {
current_token.push(c, file_pos);
col += 1;
continue;
}
match c {
'"' | '\'' => {
if in_quote {
tokens.push(Token {
value: Value::Ident(format!(
"{}{}{}",
start_quote,
current_token.token.clone(),
c
)),
position: Position {
start: FilePosition {
col: current_token.start.col - 1,
..current_token.start
},
..curr_token_pos.clone()
},
});
start_quote = char::default();
} else {
start_quote = c;
}
in_quote = !in_quote;
current_token.clear();
}
'\\' => {
is_escape = true;
}
'[' => {
tokens.push(Token {
value: Value::LeftSquareBracket,
position: position.clone(),
});
}
']' => {
tokens.push(Token {
value: Value::RightSquareBracket,
position: position.clone(),
});
}
'{' => {
tokens.push(Token {
value: Value::LeftCurlyBracket,
position: position.clone(),
});
}
'}' => {
tokens.push(Token {
value: Value::RightCurlyBracket,
position: position.clone(),
});
}
'(' => {
tokens.push(Token {
value: Value::LeftParentheses,
position: position.clone(),
});
}
')' => {
tokens.push(Token {
value: Value::RightParentheses,
position: position.clone(),
});
}
':' => {
tokens.push(Token {
value: Value::Colon,
position: position.clone(),
});
}
',' => {
tokens.push(Token {
value: Value::Comma,
position: position.clone(),
});
}
';' => {
tokens.push(Token {
value: Value::Semi,
position: position.clone(),
});
}
'=' => {
tokens.push(Token {
value: Value::Equal,
position: position.clone(),
});
}
'/' => {
current_token.push(c, file_pos.clone());
if current_token.token == "/" {
is_comment = true;
} else {
continue 'lexer_loop;
}
}
'<' => {
tokens.push(Token {
value: Value::LeftShift,
position: position.clone(),
});
}
'>' => {
tokens.push(Token {
value: Value::RightShift,
position: position.clone(),
});
}
other => {
if other.is_whitespace() && !in_quote && !is_comment {
if !current_token.is_empty() {
tokens.push(Token {
value: self.lex_current_token(current_token.token.clone()),
position: curr_token_pos.clone(),
});
current_token.clear();
}
} else {
current_token.push(c, file_pos);
}
is_others = true;
}
}
if !is_comment && !in_quote && !is_others && !current_token.is_empty() {
tokens.insert(
tokens.len() - 1,
Token {
value: self.lex_current_token(current_token.token.clone()),
position: if is_others {
curr_token_pos
} else {
Position {
end: FilePosition { row, col: col - 1 },
..curr_token_pos
}
},
},
);
current_token.clear();
}
col += 1;
}
(tokens, FilePosition { row, col })
}
}