fluidattacks-blends-domain 0.3.0

Blends functional core: pure AST graph to syntax graph (no_std)
Documentation 
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use crate::query::{adj_ast, match_ast};
use crate::syntax::builders::while_statement::build_while_statement_node;
use crate::syntax::{SyntaxGraphArgs, SyntaxGraphError};
use crate::{CodeGraph, NodeId};

pub fn reader(
    args: &mut SyntaxGraphArgs<'_>,
    n_id: NodeId,
) -> Result<Option<NodeId>, SyntaxGraphError> {
    let graph = args.ast_graph;
    let match_childs = match_ast(graph, n_id, &["parenthesized_expression", "block"], None);
    let mut block_id = match match_childs.get("block").copied().flatten() {
        Some(block_id) => block_id,
        None => adj_ast(graph, n_id, None, &[])
            .last()
            .copied()
            .ok_or(SyntaxGraphError::UnexpectedAstShape)?,
    };
    if graph.label_type(block_id) == Some("expression_statement") {
        block_id = adj_ast(graph, block_id, None, &[])
            .first()
            .copied()
            .ok_or(SyntaxGraphError::UnexpectedAstShape)?;
    }

    let conditional = match_childs
        .get("parenthesized_expression")
        .copied()
        .flatten()
        .and_then(|p_id| {
            match_ast(graph, p_id, &[], None)
                .get("__1__")
                .copied()
                .flatten()
        });

    build_while_statement_node(args, n_id, block_id, conditional).map(Some)
}