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;
use crate::syntax::builders::assignment::build_assignment_node;
use crate::syntax::fields::python::as_pattern;
use crate::syntax::{SyntaxGraphArgs, SyntaxGraphError};
use crate::NodeId;

pub fn reader(
    args: &mut SyntaxGraphArgs<'_>,
    n_id: NodeId,
) -> Result<Option<NodeId>, SyntaxGraphError> {
    let graph = args.ast_graph;
    let children = adj_ast(graph, n_id, None, &[]);
    let value_id = children
        .first()
        .copied()
        .ok_or(SyntaxGraphError::UnexpectedAstShape)?;

    let var_id = match args.optional_field_alt(n_id, as_pattern::ALIAS) {
        Some(alias_id) => adj_ast(graph, alias_id, None, &[])
            .first()
            .copied()
            .ok_or(SyntaxGraphError::UnexpectedAstShape)?,
        None => children
            .last()
            .copied()
            .ok_or(SyntaxGraphError::UnexpectedAstShape)?,
    };

    build_assignment_node(args, n_id, var_id, Some(value_id), None).map(Some)
}