rshtml_core 0.1.0

RsHtml: A Template Engine for Seamless HTML and Rust Integration.
Documentation 
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use crate::Node;
use crate::node::{ComponentParameter, ComponentParameterValue};
use crate::parser::{IParser, RsHtmlParser, Rule};
use pest::error::{Error, ErrorVariant};
use pest::iterators::Pair;

pub struct ComponentParser;

impl IParser for ComponentParser {
    fn parse(parser: &mut RsHtmlParser, pair: Pair<Rule>) -> Result<Node, Box<Error<Rule>>> {
        let pair_span = pair.as_span();

        let component_name_pair = pair
            .clone()
            .into_inner()
            .find(|p| p.as_rule() == Rule::rust_identifier)
            .ok_or(Error::new_from_span(
                ErrorVariant::ParsingError {
                    positives: vec![Rule::rust_identifier],
                    negatives: vec![],
                },
                pair_span,
            ))?;
        let component_name = component_name_pair.as_str().to_string();

        let component_parameter_pairs = pair.clone().into_inner().filter(|p| p.as_rule() == Rule::component_parameter);

        let mut component_parameters = Vec::new();
        for pair in component_parameter_pairs {
            let pair_name = pair
                .clone()
                .into_inner()
                .find(|p| p.as_rule() == Rule::rust_identifier)
                .ok_or(Error::new_from_span(
                    ErrorVariant::ParsingError {
                        positives: vec![Rule::rust_identifier],
                        negatives: vec![],
                    },
                    pair_span,
                ))?;
            let pair_value = pair
                .clone()
                .into_inner()
                .find(|p| p.as_rule() != Rule::rust_identifier)
                .ok_or(Error::new_from_span(
                    ErrorVariant::ParsingError {
                        positives: vec![
                            Rule::bool,
                            Rule::number,
                            Rule::string,
                            Rule::rust_expr_simple,
                            Rule::rust_expr_paren,
                            Rule::inner_template,
                        ],
                        negatives: vec![Rule::rust_identifier],
                    },
                    pair_span,
                ))?;

            let value = Self::build_component_parameter_value(parser, pair_value)?;
            let name = pair_name.as_str().to_string();

            component_parameters.push(ComponentParameter { name, value });
        }

        let content_pairs = pair.into_inner().find(|x| x.as_rule() == Rule::inner_template).ok_or(Error::new_from_span(
            ErrorVariant::ParsingError {
                positives: vec![Rule::inner_template],
                negatives: vec![],
            },
            pair_span,
        ))?;

        let body = parser.build_nodes_from_pairs(content_pairs.into_inner())?;
        Ok(Node::Component(component_name, component_parameters, body))
    }
}

impl ComponentParser {
    pub fn build_component_parameter_value(parser: &mut RsHtmlParser, pair: Pair<Rule>) -> Result<ComponentParameterValue, Box<Error<Rule>>> {
        match pair.as_rule() {
            Rule::bool => Ok(ComponentParameterValue::Bool(pair.as_str() == "true")),
            Rule::number => Ok(ComponentParameterValue::Number(pair.as_str().to_string())),
            Rule::string => {
                let raw_str = pair.as_str().trim_matches('"').trim_matches('\'');
                Ok(ComponentParameterValue::String(raw_str.to_string()))
            }
            Rule::rust_expr_simple => Ok(ComponentParameterValue::RustExprSimple(pair.as_str().to_string())),
            Rule::rust_expr_paren => Ok(ComponentParameterValue::RustExprParen(pair.as_str().to_string())),
            Rule::inner_template => {
                let block_nodes = parser.build_nodes_from_pairs(pair.into_inner())?;
                Ok(ComponentParameterValue::Block(block_nodes))
            }
            rule => Err(Box::new(Error::new_from_span(
                ErrorVariant::CustomError {
                    message: format!("Unexpected rule: {:?}", rule),
                },
                pair.as_span(),
            ))),
        }
    }
}