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use std::fmt::{write, Display};
#[derive(Clone, Copy, Debug)]
pub struct Location {
pub col: usize,
pub row: usize,
}
#[derive(Clone, Debug)]
pub struct Token {
pub location: Location,
pub kind: TokenKind,
}
#[derive(Clone, Debug, PartialEq)]
pub enum TokenKind {
// Basic math operators
OpPlus,
OpMinus,
OpStar,
OpSlash,
// Boolean operators
OpEq,
OpNot,
OpNeq,
OpLt,
OpGt,
OpLte,
OpGte,
// Short-circuting boolean operators
OpAnd,
OpOr,
// Statement symbols
Dot,
Comma,
Colon,
SemiColon,
Assign,
ConstAssign,
Arrow,
// Groupings
GroupOpen,
GroupClose,
BlockOpen,
BlockClose,
ArrayOpen,
ArrayClose,
// Literals
Int(u32),
Float(f32),
// String Literal Tokens
Str(String),
// StrOpen and StrClose are necessary for string embeds.
// A normal string looks like [StrOpen Str("Hello!") StrClose] in a token stream while a
// string with an embed would look something like [StrOpen Str("Hello") StrEmbed("world") Str("!") S StrClose].
StrOpen,
StrClose,
// The string embed has to be lexed by a *seperate* lexer.
StrEmbed(String),
Ident(String),
// Keywords
KeywordFn,
KeywordIf,
KeywordElif,
KeywordElse,
KeywordLoop,
KeywordForm,
KeywordType,
KeywordTrue,
KeywordFalse,
KeywordSelf,
KeywordBreak,
KeywordContinue,
KeywordReturn,
KeywordPrint,
Unknown(char),
Eof,
}
impl Display for TokenKind {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
TokenKind::OpPlus => write!(f, "+"),
TokenKind::OpMinus => write!(f, "-"),
TokenKind::OpStar => write!(f, "*"),
TokenKind::OpSlash => write!(f, "/"),
TokenKind::OpEq => write!(f, "=="),
TokenKind::OpNot => write!(f, "!"),
TokenKind::OpNeq => write!(f, "!="),
TokenKind::OpLt => write!(f, "<"),
TokenKind::OpGt => write!(f, ">"),
TokenKind::OpLte => write!(f, "<="),
TokenKind::OpGte => write!(f, ">="),
TokenKind::OpAnd => write!(f, "&&"),
TokenKind::OpOr => write!(f, "||"),
TokenKind::Dot => write!(f, "."),
TokenKind::Comma => write!(f, ","),
TokenKind::Colon => write!(f, ":"),
TokenKind::SemiColon => write!(f, ";"),
TokenKind::Assign => write!(f, "="),
TokenKind::ConstAssign => write!(f, ":="),
TokenKind::Arrow => write!(f, "->"),
TokenKind::GroupOpen => write!(f, "("),
TokenKind::GroupClose => write!(f, ")"),
// {{ Escapes a single {
TokenKind::BlockOpen => write!(f, "{{"),
TokenKind::BlockClose => write!(f, "}}"),
TokenKind::ArrayOpen => write!(f, "["),
TokenKind::ArrayClose => write!(f, "]"),
TokenKind::Int(v) => write!(f, "{}", v),
TokenKind::Float(v) => write!(f, "{}", v),
// These are a bit weird, because they aren't direct mappi
TokenKind::Str(v) => write!(f, "\"{}\"", v),
TokenKind::StrOpen => write!(f, "\""),
TokenKind::StrClose => write!(f, "\""),
TokenKind::StrEmbed(v) => write!(f, "{{{}}}", v),
TokenKind::Ident(v) => write!(f, "{}", v),
TokenKind::KeywordFn => write!(f, "fn"),
TokenKind::KeywordIf => write!(f, "if"),
TokenKind::KeywordElif => write!(f, "elif"),
TokenKind::KeywordElse => write!(f, "else"),
TokenKind::KeywordLoop => write!(f, "loop"),
TokenKind::KeywordForm => write!(f, "form"),
TokenKind::KeywordType => write!(f, "type"),
TokenKind::KeywordTrue => write!(f, "true"),
TokenKind::KeywordFalse => write!(f, "false"),
TokenKind::KeywordSelf => write!(f, "self"),
TokenKind::KeywordBreak => write!(f, "break"),
TokenKind::KeywordContinue => write!(f, "continue"),
TokenKind::KeywordReturn => write!(f, "return"),
TokenKind::KeywordPrint => write!(f, "print"),
TokenKind::Unknown(v) => write!(f, "{}", v),
TokenKind::Eof => write!(f, "end of file"),
}
}
}
|
