fluidattacks-blends-domain 0.3.0

Blends functional core: pure AST graph to syntax graph (no_std)
Documentation 
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//! Counterpart of `blends/syntax/readers/yaml/block_sequence.py`.

use alloc::vec::Vec;

use crate::query::adj_ast;
use crate::syntax::builders::array_node::build_array_node;
use crate::syntax::{SyntaxGraphArgs, SyntaxGraphError};
use crate::{CodeGraph, NodeId};

pub fn reader(
    args: &mut SyntaxGraphArgs<'_>,
    n_id: NodeId,
) -> Result<Option<NodeId>, SyntaxGraphError> {
    let invalid_types = ["[", "]", "{", "}", ",", ";"];
    let graph = args.ast_graph;

    let valid_seqs: Vec<NodeId> = adj_ast(graph, n_id, None, &[])
        .into_iter()
        .filter(|c_id| {
            !graph
                .label_type(*c_id)
                .is_some_and(|kind| invalid_types.contains(&kind))
        })
        .collect();

    let mut usable_ids: Vec<NodeId> = Vec::new();
    for item_id in valid_seqs {
        let childs = adj_ast(graph, item_id, None, &[]);
        let Some(current_id) = childs.get(1).copied() else {
            continue;
        };
        if graph.label_type(current_id) != Some("block_node") {
            usable_ids.push(current_id);
            continue;
        }
        let current_id_childs = adj_ast(graph, current_id, None, &[]);
        let Some(first_id) = current_id_childs.first().copied() else {
            continue;
        };
        let chosen = if graph.label_type(first_id) == Some("tag") {
            current_id_childs.last().copied().unwrap_or(first_id)
        } else {
            first_id
        };
        usable_ids.push(chosen);
    }
    build_array_node(args, n_id, &usable_ids).map(Some)
}