fluidattacks-blends-domain 0.6.1

Blends functional core: pure AST graph to syntax graph (no_std)
Documentation 
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use crate::query::{match_ast, match_ast_d, match_ast_group_d};
use crate::syntax::builders::parameter::build_parameter_node;
use crate::syntax::fields::c_sharp::parameter;
use crate::syntax::{SyntaxGraphArgs, SyntaxGraphError};
use crate::utilities::text_nodes::node_to_str;
use crate::NodeId;

pub fn reader(
    args: &mut SyntaxGraphArgs<'_>,
    n_id: NodeId,
) -> Result<Option<NodeId>, SyntaxGraphError> {
    let graph = args.ast_graph;
    let variable = node_to_str(graph, args.required_field_alt(n_id, parameter::NAME)?);
    let variable_type = args
        .optional_field_alt(n_id, parameter::TYPE)
        .map(|type_id| node_to_str(graph, type_id));
    let modifier = match_ast_d(graph, n_id, "parameter_modifier", Some(1))
        .map(|mod_id| node_to_str(graph, mod_id));
    let value_id = match_ast_d(graph, n_id, "expression", Some(1)).and_then(|eq_id| {
        match_ast(graph, eq_id, &["="], None)
            .get("__0__")
            .copied()
            .flatten()
    });
    let attributes_ids = match_ast_group_d(graph, n_id, "attribute_list", Some(1));

    build_parameter_node(
        args,
        n_id,
        Some(variable),
        variable_type,
        value_id,
        &attributes_ids,
        None,
        modifier,
    )
    .map(Some)
}