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//! Tokens for decoration.
//!
//! This design allows decorating expressions
//! in a flexible way that controls the text display.
use crate::Expr;
use serde::{Serialize, Deserialize};
/// Used to decorate expressions with extra information.
#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq, Hash)]
pub enum Token {
/// An expression.
TokenExpr(Expr),
/// A string.
Str(String),
/// `(`.
StartParens,
/// `)`.
EndParens,
/// `[`.
StartSquareBracket,
/// `]`.
EndSquareBracket,
/// `{`.
StartCurlyBracket,
/// `}`.
EndCurlyBracket,
/// `,`.
Comma,
/// ` `.
Space,
/// `\n`.
NewLine,
/// Tabs.
Tabs,
/// Tabs minus one level.
TabsPrev,
}
impl Token {
/// Returns if the token is a start bracket.
pub fn is_start_bracket(&self) -> bool {
use Token::*;
match self {
StartParens | StartSquareBracket | StartCurlyBracket => true,
_ => false,
}
}
}
impl From<Expr> for Token {
fn from(val: Expr) -> Token {Token::TokenExpr(val)}
}