graphify-extract 0.7.0

use std::collections::HashMap;
use std::path::Path;

use graphify_core::confidence::Confidence;
use graphify_core::id::make_id;
use graphify_core::model::{ExtractionResult, GraphNode, NodeType};

use super::{
    RE_C_FUNC, RE_C_INCLUDE, RE_C_STRUCT, RE_CPP_CLASS, end_line_at, infer_calls, line_of,
    make_edge, make_file_node, make_node, path_str,
};

pub(crate) fn extract_c_cpp(path: &Path, source: &str, lang: &str) -> ExtractionResult {
    let mut result = ExtractionResult::default();
    let file_node = make_file_node(path);
    let file_id = file_node.id.clone();
    result.nodes.push(file_node);

    let lines: Vec<&str> = source.lines().collect();
    let ps = path_str(path);

    // #include directives
    for cap in RE_C_INCLUDE.captures_iter(source) {
        let header = &cap[1];
        let line = line_of(source, &cap);
        let import_id = make_id(&[&ps, "include", header]);
        result.nodes.push(GraphNode {
            id: import_id.clone(),
            label: header.to_string(),
            source_file: ps.clone(),
            source_location: Some(format!("L{line}")),
            node_type: NodeType::Module,
            community: None,
            extra: HashMap::new(),
        });
        result.edges.push(make_edge(
            &file_id,
            &import_id,
            "includes",
            path,
            Confidence::Extracted,
        ));
    }

    if lang == "cpp" {
        for cap in RE_CPP_CLASS.captures_iter(source) {
            let name = &cap[1];
            let line = line_of(source, &cap);
            let node = make_node(name, path, NodeType::Class, line);
            let node_id = node.id.clone();
            result.nodes.push(node);
            result.edges.push(make_edge(
                &file_id,
                &node_id,
                "defines",
                path,
                Confidence::Extracted,
            ));
        }
    }

    if lang == "c" {
        for cap in RE_C_STRUCT.captures_iter(source) {
            let name = &cap[1];
            let line = line_of(source, &cap);
            let node = make_node(name, path, NodeType::Struct, line);
            let node_id = node.id.clone();
            result.nodes.push(node);
            result.edges.push(make_edge(
                &file_id,
                &node_id,
                "defines",
                path,
                Confidence::Extracted,
            ));
        }
    }

    let mut functions: Vec<(String, String, usize, usize)> = Vec::new();
    let func_matches: Vec<_> = RE_C_FUNC.captures_iter(source).collect();
    for (i, cap) in func_matches.iter().enumerate() {
        let name = cap[1].to_string();
        if ["if", "for", "while", "switch", "return", "sizeof"].contains(&name.as_str()) {
            continue;
        }
        let start_line = line_of(source, cap);
        let end_line = end_line_at(source, func_matches.get(i + 1));

        let node = make_node(&name, path, NodeType::Function, start_line);
        let node_id = node.id.clone();
        functions.push((name, node_id.clone(), start_line, end_line));
        result.nodes.push(node);
        result.edges.push(make_edge(
            &file_id,
            &node_id,
            "defines",
            path,
            Confidence::Extracted,
        ));
    }

    let call_edges = infer_calls(&functions, &lines, path);
    result.edges.extend(call_edges);

    result
}