ftml 1.41.0

Foundation Text Markup Language - a library to render Wikidot text as HTML
Documentation 
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/*
 * parsing/rule/impls/block/blocks/embed.rs
 *
 * ftml - Library to parse Wikidot text
 * Copyright (C) 2019-2026 Wikijump Team
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

use super::prelude::*;
use crate::tree::Embed;

type EmbedBuilderFn = for<'p, 't> fn(
    &'p Parser<'_, 't>,
    &'p mut Arguments<'t>,
) -> Result<Embed<'t>, ParseError>;

pub const BLOCK_EMBED: BlockRule = BlockRule {
    name: "block-embed",
    accepts_names: &["embed"],
    accepts_star: false,
    accepts_score: false,
    accepts_newlines: true,
    parse_fn,
};

fn parse_fn<'r, 't>(
    parser: &mut Parser<'r, 't>,
    name: &'t str,
    flag_star: bool,
    flag_score: bool,
    in_head: bool,
) -> ParseResult<'r, 't, Elements<'t>> {
    debug!("Parsing embed block (name '{name}', in-head {in_head})");
    assert!(!flag_star, "Embed doesn't allow star flag");
    assert!(!flag_score, "Embed doesn't allow star flag");
    assert_block_name(&BLOCK_EMBED, name);

    let (name, mut arguments) = parser.get_head_name_map(&BLOCK_EMBED, in_head)?;
    let embed = build_embed(parser, name, &mut arguments)?;

    ok!(Element::Embed(embed))
}

fn build_embed<'r, 't>(
    parser: &Parser<'r, 't>,
    name: &str,
    arguments: &mut Arguments<'t>,
) -> Result<Embed<'t>, ParseError>
where
    'r: 't,
{
    const EMBED_BUILDERS: &[(&str, EmbedBuilderFn)] =
        &[("youtube", build_youtube), ("vimeo", build_vimeo)];

    for &(embed_name, builder) in EMBED_BUILDERS {
        if embed_name.eq_ignore_ascii_case(name) {
            return builder(parser, arguments);
        }
    }

    Err(parser.make_err(ParseErrorKind::NoSuchEmbed))
}

// Different embed builders

fn build_youtube<'p, 't>(
    parser: &'p Parser<'_, 't>,
    arguments: &'p mut Arguments<'t>,
) -> Result<Embed<'t>, ParseError> {
    let video_id = arguments
        .get("video")
        .ok_or_else(|| parser.make_err(ParseErrorKind::BlockMissingArguments))?;

    Ok(Embed::Youtube { video_id })
}

fn build_vimeo<'p, 't>(
    parser: &'p Parser<'_, 't>,
    arguments: &'p mut Arguments<'t>,
) -> Result<Embed<'t>, ParseError> {
    let video_id = arguments
        .get("video")
        .ok_or_else(|| parser.make_err(ParseErrorKind::BlockMissingArguments))?;

    Ok(Embed::Vimeo { video_id })
}

#[test]
fn embed_builder_types() {
    let _: EmbedBuilderFn = build_youtube;
    let _: EmbedBuilderFn = build_vimeo;
}