omena-parser 0.2.0

Green-field cstree parser substrate for the Omena CSS parser stack
Documentation 
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use omena_parser::{StyleDialect, summarize_omena_parser_style_facts};
use serde::Deserialize;
use std::io::{self, Read};

#[derive(Debug, Deserialize)]
#[serde(rename_all = "camelCase")]
struct StyleFactsInputV0 {
    style_source: String,
    dialect: String,
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut stdin = String::new();
    io::stdin().read_to_string(&mut stdin)?;
    let input: StyleFactsInputV0 = serde_json::from_str(&stdin)?;
    let dialect = parse_style_dialect(input.dialect.as_str())?;
    let summary = summarize_omena_parser_style_facts(&input.style_source, dialect);
    serde_json::to_writer_pretty(io::stdout(), &summary)?;
    Ok(())
}

fn parse_style_dialect(dialect: &str) -> Result<StyleDialect, Box<dyn std::error::Error>> {
    match dialect {
        "css" => Ok(StyleDialect::Css),
        "scss" => Ok(StyleDialect::Scss),
        "sass" => Ok(StyleDialect::Sass),
        "less" => Ok(StyleDialect::Less),
        other => Err(format!("unsupported omena parser style dialect: {other}").into()),
    }
}