arborist-metrics 0.1.3

Multi-language code complexity metrics (cognitive, cyclomatic, SLOC) powered by tree-sitter
Documentation 
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// SPDX-License-Identifier: MIT OR Apache-2.0
// Copyright (c) 2026 Strange Days Tech S.A.S. de C.V. <https://strangedays.tech>

use crate::languages::LanguageProfile;

/// Recursively find a `function_declarator` inside a node tree
/// (handles pointer_declarator, reference_declarator wrappers).
fn find_function_declarator_name(node: &tree_sitter::Node, source: &[u8]) -> Option<String> {
    let mut cursor = node.walk();
    for child in node.children(&mut cursor) {
        if child.kind() == "function_declarator" {
            return child
                .child_by_field_name("declarator")
                .and_then(|n| n.utf8_text(source).ok())
                .map(|s| s.to_string());
        }
        if (child.kind() == "pointer_declarator" || child.kind() == "reference_declarator")
            && let Some(name) = find_function_declarator_name(&child, source)
        {
            return Some(name);
        }
    }
    None
}

pub struct CProfile;

impl LanguageProfile for CProfile {
    fn function_nodes(&self) -> &[&str] {
        &["function_definition"]
    }

    fn control_flow_nodes(&self) -> &[&str] {
        &[
            "if_statement",
            "for_statement",
            "while_statement",
            "do_statement",
            "switch_statement",
            "else_clause",
            "conditional_expression",
            "goto_statement",
        ]
    }

    fn nesting_nodes(&self) -> &[&str] {
        &[
            "if_statement",
            "for_statement",
            "while_statement",
            "do_statement",
            "switch_statement",
        ]
    }

    fn boolean_operators(&self) -> &[&str] {
        &["&&", "||"]
    }

    fn else_if_nodes(&self) -> &[&str] {
        &[]
    }

    fn lambda_nodes(&self) -> &[&str] {
        &[]
    }

    fn comment_nodes(&self) -> &[&str] {
        &["comment"]
    }

    fn extract_function_name(&self, node: &tree_sitter::Node, source: &[u8]) -> Option<String> {
        find_function_declarator_name(node, source)
    }

    fn parser_language(&self) -> tree_sitter::Language {
        tree_sitter_c::LANGUAGE.into()
    }

    fn extensions(&self) -> &[&str] {
        &[".c", ".h"]
    }

    fn is_method(&self, _node: &tree_sitter::Node) -> bool {
        false
    }

    fn match_construct_nodes(&self) -> &[&str] {
        &["switch_statement"]
    }

    fn match_arm_nodes(&self) -> &[&str] {
        &["case_statement"]
    }
}