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//! Different token definitions.

//! Loosely based on token.h from CPython source:

use num_bigint::BigInt;

use std::fmt::{self, Write};

/// 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 {

0..=8 => write!(f, "\\x0{}", i)?,

9 => f.write_str("\\t")?,

10 => f.write_str("\\n")?,

11 => write!(f, "\\x0{:x}", i)?,

13 => f.write_str("\\r")?,

32..=126 => f.write_char(*i as char)?,

_ => write!(f, "\\x{:x}", 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("'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("':='"),

}

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