fncc_core/
lib.rs

1pub mod codegen;
2pub mod config;
3pub mod parser;
4
5pub use parser::parse;
6
7use anyhow::{Context, Result};
8use std::path::Path;
9
10/// Main entry point: parse all .fui files under `ui_dir` and write
11/// generated Rust code into `out_file`.
12pub fn generate_all(ui_dir: &Path, out_file: &Path) -> Result<()> {
13    let mut output = String::new();
14    output.push_str("// Generated by fncc-core. Do not edit.\n\n");
15
16    let mut file_id = 0;
17    let entries = std::fs::read_dir(ui_dir).context("failed to read ui dir")?;
18    for entry in entries {
19        let entry = entry.context("failed to read entry")?;
20        let path = entry.path();
21        if path.extension().is_some_and(|ext| ext == "fui") {
22            let source = std::fs::read_to_string(&path).with_context(|| format!("failed to read {:?}", path))?;
23            let ast = parser::parse(&source).map_err(|e| anyhow::anyhow!("failed to parse {:?}: {e}", path))?;
24            let generated = codegen::generate_with_id(&ast, file_id);
25            output.push_str(&generated);
26            output.push('\n');
27            file_id += 1;
28        }
29    }
30
31    std::fs::write(out_file, &output).context("failed to write generated file")?;
32    Ok(())
33}
34
35#[cfg(test)]
36mod tests {
37    use super::*;
38    use std::path::PathBuf;
39    use std::sync::atomic::{AtomicUsize, Ordering};
40
41    static LIB_TEST_COUNTER: AtomicUsize = AtomicUsize::new(0);
42
43    fn test_dir() -> (PathBuf, PathBuf) {
44        let id = LIB_TEST_COUNTER.fetch_add(1, Ordering::Relaxed);
45        let dir = std::env::temp_dir().join(format!("fncc_lib_test_{id}"));
46        let ui_dir = dir.join("ui");
47        std::fs::create_dir_all(&ui_dir).unwrap();
48        (dir, ui_dir)
49    }
50
51    #[test]
52    fn test_generate_all_creates_output_file() {
53        let (dir, ui_dir) = test_dir();
54        std::fs::write(ui_dir.join("App.fui"), "<Text>hello</Text>").unwrap();
55        let out_file = dir.join("out.rs");
56
57        generate_all(&ui_dir, &out_file).unwrap();
58
59        assert!(out_file.exists());
60        let content = std::fs::read_to_string(&out_file).unwrap();
61        assert!(content.contains("// Generated by fncc-core. Do not edit."));
62        assert!(content.contains("pub fn render_text()"));
63        std::fs::remove_dir_all(&dir).unwrap();
64    }
65
66    #[test]
67    fn test_generate_all_ignores_non_fui_files() {
68        let (dir, ui_dir) = test_dir();
69        std::fs::write(ui_dir.join("App.fui"), "<A></A>").unwrap();
70        std::fs::write(ui_dir.join("notes.txt"), "not a fui").unwrap();
71        std::fs::write(ui_dir.join("main.rs"), "fn main() {}").unwrap();
72        let out_file = dir.join("out.rs");
73
74        generate_all(&ui_dir, &out_file).unwrap();
75
76        let content = std::fs::read_to_string(&out_file).unwrap();
77        assert!(content.contains("render_a"));
78        assert!(!content.contains("notes"));
79        assert!(!content.contains("main"));
80        std::fs::remove_dir_all(&dir).unwrap();
81    }
82}
fncc_core/lib.rs

fncc_core/
lib.rs
