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.
Documentation 
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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::{
        AttributeConversion,
        CssVariableConversion,
        FontRelativeLengthConversion,
        PercentageConversion,
        ViewportPercentageLengthConversion,
    },
    crate::domain::units::Unit,
    std::collections::HashMap,
};

#[derive(Default, Debug, Clone)]
pub struct SimplisticExampleOfConversion<U: Unit> {
    // Font relative lengths
    pub em: U::Number,
    pub ex: U::Number,
    pub ch: U::Number,
    pub rem: U::Number,

    // Viewport percentage lengths
    pub vw: U::Number,
    pub vh: U::Number,
    pub vmin: U::Number,
    pub vmax: U::Number,

    // Percent conversion
    pub one_hundred_percent_in_absolute_units: U::Number,

    // Simplistic approach
    pub cssVariablesWithLowerCaseNamesWithoutLeadingDoubleDashToRawCss:
        HashMap<String, String>,
    pub attributesWithLowerCaseNames: HashMap<String, String>,
}

impl<U: Unit> FontRelativeLengthConversion<U::Number>
    for SimplisticExampleOfConversion<U>
{
    #[inline(always)]
    fn em(&self) -> U::Number {
        self.em
    }

    #[inline(always)]
    fn ex(&self) -> U::Number {
        self.ex
    }

    #[inline(always)]
    fn ch(&self) -> U::Number {
        self.ch
    }

    #[inline(always)]
    fn rem(&self) -> U::Number {
        self.rem
    }
}

impl<U: Unit> ViewportPercentageLengthConversion<U::Number>
    for SimplisticExampleOfConversion<U>
{
    #[inline(always)]
    fn vw(&self) -> U::Number {
        self.vw
    }

    #[inline(always)]
    fn vh(&self) -> U::Number {
        self.vh
    }

    #[inline(always)]
    fn vmin(&self) -> U::Number {
        self.vmin
    }

    #[inline(always)]
    fn vmax(&self) -> U::Number {
        self.vmax
    }
}

impl<U: Unit> PercentageConversion<U::Number>
    for SimplisticExampleOfConversion<U>
{
    #[inline(always)]
    fn one_hundred_percent_in_absolute_units(&self) -> U::Number {
        self.one_hundred_percent_in_absolute_units
    }
}

impl<U: Unit> CssVariableConversion for SimplisticExampleOfConversion<U> {
    #[inline(always)]
    fn cssVariableValue(
        &self,
        css_variable_lower_case_name_without_leading_double_dash: &str,
    ) -> Option<&str> {
        match self
            .cssVariablesWithLowerCaseNamesWithoutLeadingDoubleDashToRawCss
            .get(css_variable_lower_case_name_without_leading_double_dash)
        {
            Some(value) => Some(&value[..]),
            None => None,
        }
    }
}

impl<U: Unit> AttributeConversion<U> for SimplisticExampleOfConversion<U> {
    /// Returns the (value of the attribute, property default)
    /// In this simplistic example, since we don't know th property name, we assume all property defaults are the specification default: <https://drafts.csswg.org/css-values-3/#typedef-type-or-unit>
    #[inline(always)]
    fn attributeValue(
        &self,
        attribute_lower_case_name: &str,
    ) -> (Option<&str>, U) {
        match self
            .attributesWithLowerCaseNames
            .get(attribute_lower_case_name)
        {
            Some(value) => (Some(&value[..]), U::default()),
            None => (None, U::default()),
        }
    }
}