lewp-css 0.2.0

Domain model for CSS Stylesheets. Allowing effective minification and transformations such as autoprefixing and removal by other crates. Updated and maintained version for lewp.
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// This file is part of css. It is subject to the license terms in the COPYRIGHT file found in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/css/master/COPYRIGHT. No part of predicator, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
// Copyright © 2017 The developers of css. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/css/master/COPYRIGHT.

use {
    crate::{
        parsers::{Parse, ParserContext},
        CustomParseError,
    },
    cssparser::{
        serialize_identifier,
        serialize_string,
        BasicParseError,
        BasicParseErrorKind,
        ParseError,
        Parser,
        ToCss,
        Token,
    },
    std::fmt,
};

/// <https://drafts.csswg.org/css-counter-styles/#typedef-symbol>
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Symbol {
    /// <string>
    String(String),

    /// <ident>
    Ident(String),
    // Not implemented:
    // /// <image>
    // Image(Image),
}

impl Parse for Symbol {
    fn parse<'i, 't>(
        _context: &ParserContext,
        input: &mut Parser<'i, 't>,
    ) -> Result<Self, ParseError<'i, CustomParseError<'i>>> {
        use self::Symbol::*;

        match input.next() {
            Ok(&Token::QuotedString(ref s)) => {
                Ok(String(s.as_ref().to_owned()))
            }

            Ok(&Token::Ident(ref s)) => Ok(Ident(s.as_ref().to_owned())),

            Ok(token) => Err(ParseError::from(BasicParseError {
                kind: BasicParseErrorKind::UnexpectedToken(token.clone()),
                location: input.state().source_location(),
            })),

            Err(e) => Err(e.into()),
        }
    }
}

impl ToCss for Symbol {
    fn to_css<W: fmt::Write>(&self, dest: &mut W) -> fmt::Result {
        use self::Symbol::*;

        match *self {
            String(ref string) => serialize_string(string, dest),
            Ident(ref string) => serialize_identifier(string, dest),
        }
    }
}

impl Symbol {
    /// Returns whether this symbol is allowed in symbols() function.
    pub fn is_allowed_in_symbols(&self) -> bool {
        use self::Symbol::*;

        match self {
            // Identifier is not allowed.
            &Ident(_) => false,

            _ => true,
        }
    }
}