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::match_ast;
use crate::syntax::builders::if_statement::build_if_node;
use crate::syntax::{SyntaxGraphArgs, SyntaxGraphError};
use crate::NodeId;

pub fn reader(
    args: &mut SyntaxGraphArgs<'_>,
    n_id: NodeId,
) -> Result<Option<NodeId>, SyntaxGraphError> {
    let matched = match_ast(args.ast_graph, n_id, &["if", "else"], None);
    let has_if = matched.get("if").copied().flatten().is_some();
    let has_else = matched.get("else").copied().flatten().is_some();

    if has_if && has_else && matched.len() == 5 {
        let condition = matched
            .get("__1__")
            .copied()
            .flatten()
            .ok_or(SyntaxGraphError::UnexpectedAstShape)?;
        let true_id = matched.get("__0__").copied().flatten();
        let false_id = matched.get("__2__").copied().flatten();
        return build_if_node(args, n_id, condition, true_id, false_id, None).map(Some);
    }

    let condition = matched
        .get("__0__")
        .copied()
        .flatten()
        .ok_or(SyntaxGraphError::UnexpectedAstShape)?;
    build_if_node(args, n_id, condition, None, None, None).map(Some)
}