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 {
    super::{Parse, ParserContext},
    crate::{
        domain::{
            at_rules::font_feature_values::FontFeatureValuesDeclaration,
            Atom,
        },
        CustomParseError,
    },
    cssparser::{
        AtRuleParser,
        CowRcStr,
        DeclarationListParser,
        DeclarationParser,
        ParseError,
        Parser,
        ToCss,
    },
};

/// @font-feature-values inside block parser. Parses a list of `FontFeatureValuesDeclaration`.
/// (`<ident>: <integer>+`)
pub(crate) struct FontFeatureValuesDeclarationsParser<'a, T: 'a + Parse + ToCss>
{
    context: &'a ParserContext,
    declarations: &'a mut Vec<FontFeatureValuesDeclaration<T>>,
}

/// Default methods reject all at rules.
impl<'a, 'i, T: 'a + Parse + ToCss> AtRuleParser<'i>
    for FontFeatureValuesDeclarationsParser<'a, T>
{
    type Prelude = ();

    type AtRule = ();

    type Error = CustomParseError<'i>;
}

impl<'a, 'i, T: 'a + Parse + ToCss> DeclarationParser<'i>
    for FontFeatureValuesDeclarationsParser<'a, T>
{
    type Declaration = ();

    type Error = CustomParseError<'i>;

    fn parse_value<'t>(
        &mut self,
        name: CowRcStr<'i>,
        input: &mut Parser<'i, 't>,
    ) -> Result<(), ParseError<'i, CustomParseError<'i>>> {
        let fontFeatureValuesDeclaration = FontFeatureValuesDeclaration {
            name: Atom::from(&*name),
            value: input.parse_entirely(|i| T::parse(self.context, i))?,
        };

        self.update_or_push(fontFeatureValuesDeclaration);

        Ok(())
    }
}

impl<'a, 'b: 'a, T: 'a + Parse + ToCss>
    FontFeatureValuesDeclarationsParser<'a, T>
{
    pub(crate) fn parseBlock<'i, 't>(
        input: &mut Parser<'i, 't>,
        context: &'a ParserContext,
        declarations: &'a mut Vec<FontFeatureValuesDeclaration<T>>,
    ) -> Result<(), ParseError<'i, CustomParseError<'i>>> {
        let parser = Self {
            context,
            declarations,
        };

        let iter = DeclarationListParser::new(input, parser);
        for possiblePreciseParseError in iter {
            if let Err(msg) = possiblePreciseParseError {
                return Err(msg.0);
            }
        }

        Ok(())
    }

    /// Updates with new value if same `ident` exists, otherwise pushes to the vector.
    fn update_or_push(
        &mut self,
        newDeclaration: FontFeatureValuesDeclaration<T>,
    ) {
        let declarations = &mut self.declarations;

        let position = declarations.iter().position(|thisDeclaration| {
            thisDeclaration.name == newDeclaration.name
        });

        if let Some(index) = position {
            declarations[index].value = newDeclaration.value;
        } else {
            declarations.push(newDeclaration);
        }
    }
}