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token.rs
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//! Different token definitions.
//! Loosely based on token.h from CPython source:
use alloc::{string::String, vec::Vec};
use core::fmt::{self, Write};
use num_bigint::BigInt;
/// Python source code can be tokenized in a sequence of these tokens.
#[derive(Clone, Debug, PartialEq)]
pub enum Tok {
Name { name: String },
Int { value: BigInt },
Float { value: f64 },
Complex { real: f64, imag: f64 },
String { value: String, is_fstring: bool },
Bytes { value: Vec<u8> },
Newline,
Indent,
Dedent,
StartProgram,
StartStatement,
StartExpression,
EndOfFile,
Lpar,
Rpar,
Lsqb,
Rsqb,
Colon,
Comma,
Semi,
Plus,
Minus,
Star,
Slash,
Vbar, // '|'
Amper, // '&'
Less,
Greater,
Equal,
Dot,
Percent,
Lbrace,
Rbrace,
EqEqual,
NotEqual,
LessEqual,
GreaterEqual,
Tilde,
CircumFlex,
LeftShift,
RightShift,
DoubleStar,
DoubleStarEqual, // '**='
PlusEqual,
MinusEqual,
StarEqual,
SlashEqual,
PercentEqual,
AmperEqual, // '&='
VbarEqual,
CircumflexEqual, // '^='
LeftShiftEqual,
RightShiftEqual,
DoubleSlash, // '//'
DoubleSlashEqual,
ColonEqual,
At,
AtEqual,
Rarrow,
Ellipsis,
// Keywords (alphabetically):
False,
None,
True,
And,
As,
Assert,
Async,
Await,
Break,
Class,
Continue,
Def,
Del,
Elif,
Else,
Except,
Finally,
For,
From,
Global,
If,
Import,
In,
Is,
Lambda,
Nonlocal,
Not,
Or,
Pass,
Raise,
Return,
Try,
While,
With,
Yield,
}
impl fmt::Display for Tok {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use Tok::*;
match self {
Name { name } => write!(f, "'{}'", name),
Int { value } => write!(f, "'{}'", value),
Float { value } => write!(f, "'{}'", value),
Complex { real, imag } => write!(f, "{}j{}", real, imag),
String { value, is_fstring } => {
if *is_fstring {
write!(f, "f")?
}
write!(f, "{:?}", value)
}
Bytes { value } => {
write!(f, "b\"")?;
for i in value {
match i {
9 => f.write_str("\\t")?,
10 => f.write_str("\\n")?,
13 => f.write_str("\\r")?,
32..=126 => f.write_char(*i as char)?,
_ => write!(f, "\\x{:02x}", i)?,
}
}
f.write_str("\"")
}
Newline => f.write_str("Newline"),
Indent => f.write_str("Indent"),
Dedent => f.write_str("Dedent"),
StartProgram => f.write_str("StartProgram"),
StartStatement => f.write_str("StartStatement"),
StartExpression => f.write_str("StartExpression"),
EndOfFile => f.write_str("EOF"),
Lpar => f.write_str("'('"),
Rpar => f.write_str("')'"),
Lsqb => f.write_str("'['"),
Rsqb => f.write_str("']'"),
Colon => f.write_str("':'"),
Comma => f.write_str("','"),
Semi => f.write_str("';'"),
Plus => f.write_str("'+'"),
Minus => f.write_str("'-'"),
Star => f.write_str("'*'"),
Slash => f.write_str("'/'"),
Vbar => f.write_str("'|'"),
Amper => f.write_str("'&'"),
Less => f.write_str("'<'"),
Greater => f.write_str("'>'"),
Equal => f.write_str("'='"),
Dot => f.write_str("'.'"),
Percent => f.write_str("'%'"),
Lbrace => f.write_str("'{'"),
Rbrace => f.write_str("'}'"),
EqEqual => f.write_str("'=='"),
NotEqual => f.write_str("'!='"),
LessEqual => f.write_str("'<='"),
GreaterEqual => f.write_str("'>='"),
Tilde => f.write_str("'~'"),
CircumFlex => f.write_str("'^'"),
LeftShift => f.write_str("'<<'"),
RightShift => f.write_str("'>>'"),
DoubleStar => f.write_str("'**'"),
DoubleStarEqual => f.write_str("'**='"),
PlusEqual => f.write_str("'+='"),
MinusEqual => f.write_str("'-='"),
StarEqual => f.write_str("'*='"),
SlashEqual => f.write_str("'/='"),
PercentEqual => f.write_str("'%='"),
AmperEqual => f.write_str("'&='"),
VbarEqual => f.write_str("'|='"),
CircumflexEqual => f.write_str("'^='"),
LeftShiftEqual => f.write_str("'<<='"),
RightShiftEqual => f.write_str("'>>='"),
DoubleSlash => f.write_str("'//'"),
DoubleSlashEqual => f.write_str("'//='"),
At => f.write_str("'@'"),
AtEqual => f.write_str("'@='"),
Rarrow => f.write_str("'->'"),
Ellipsis => f.write_str("'...'"),
False => f.write_str("'False'"),
None => f.write_str("'None'"),
True => f.write_str
55CE
("'True'"),
And => f.write_str("'and'"),
As => f.write_str("'as'"),
Assert => f.write_str("'assert'"),
Async => f.write_str("'async'"),
Await => f.write_str("'await'"),
Break => f.write_str("'break'"),
Class => f.write_str("'class'"),
Continue => f.write_str("'continue'"),
Def => f.write_str("'def'"),
Del => f.write_str("'del'"),
Elif => f.write_str("'elif'"),
Else => f.write_str("'else'"),
Except => f.write_str("'except'"),
Finally => f.write_str("'finally'"),
For => f.write_str("'for'"),
From => f.write_str("'from'"),
Global => f.write_str("'global'"),
If => f.write_str("'if'"),
Import => f.write_str("'import'"),
In => f.write_str("'in'"),
Is => f.write_str("'is'"),
Lambda => f.write_str("'lambda'"),
Nonlocal => f.write_str("'nonlocal'"),
Not => f.write_str("'not'"),
Or => f.write_str("'or'"),
Pass => f.write_str("'pass'"),
Raise => f.write_str("'raise'"),
Return => f.write_str("'return'"),
Try => f.write_str("'try'"),
While => f.write_str("'while'"),
With => f.write_str("'with'"),
Yield => f.write_str("'yield'"),
ColonEqual => f.write_str("':='"),
}
}
}