fluidattacks-blends-domain 0.17.1

Blends functional core: pure AST graph to syntax graph (no_std)
Documentation 
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use crate::{
    query::{adj_ast, match_ast_d, match_ast_group_d, pred_ast},
    syntax::{
        builders::if_statement::build_if_node,
        fields::{php::else_clause, Field},
        SyntaxGraphArgs, SyntaxGraphError,
    },
    CodeGraph, NodeId,
};

const CONDITION: Field<true> = Field::new("condition_id");
const BODY: Field<true> = Field::new("body_id");
const ALTERNATIVE: Field<false> = Field::new("alternative_id");

fn get_false_id(
    args: &SyntaxGraphArgs<'_>,
    if_n_id: NodeId,
    current_n_id: NodeId,
) -> Option<NodeId> {
    let graph = args.ast_graph;

    for elif_n_id in match_ast_group_d(graph, if_n_id, "else_if_clause", Some(1)) {
        if elif_n_id > current_n_id {
            return Some(elif_n_id);
        }
    }

    let else_n_id = match_ast_d(graph, if_n_id, "else_clause", None)?;
    args.required_field_alt(else_n_id, else_clause::BODY).ok()
}

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

    let mut condition_id = args.required_field_alt(n_id, CONDITION)?;
    if graph.label_type(condition_id) == Some("parenthesized_expression") {
        if let Some(&inner) = adj_ast(graph, condition_id, Some(1), &[]).get(1) {
            condition_id = inner;
        }
    }

    let true_id = args.required_field_alt(n_id, BODY)?;

    let mut false_id = args.optional_field_alt(n_id, ALTERNATIVE);
    if false_id.is_none() {
        for anc in pred_ast(graph, n_id, Some(-1)) {
            if graph.label_type(anc) == Some("if_statement")
                && adj_ast(graph, anc, Some(1), &[]).contains(&n_id)
            {
                false_id = get_false_id(args, anc, n_id);
            }
        }
    }

    if let Some(fid) = false_id {
        if graph.label_type(fid) == Some("else_clause") {
            false_id = Some(args.required_field_alt(fid, else_clause::BODY)?);
        }
    }

    build_if_node(args, n_id, condition_id, Some(true_id), false_id, None).map(Some)
}