oxc/crates/oxc_semantic/examples/simple.rs

#![allow(clippy::print_stdout)]
use std::{env, path::Path, sync::Arc};

use itertools::Itertools;
use oxc_allocator::Allocator;
use oxc_parser::Parser;
use oxc_semantic::SemanticBuilder;
use oxc_span::SourceType;

// Instruction:
// create a `test.js`,
// run `cargo run -p oxc_semantic --example simple`
// or `just watch "run -p oxc_semantic --example simple"`

fn main() -> std::io::Result<()> {
    let name = env::args().nth(1).unwrap_or_else(|| "test.js".to_string());
    let path = Path::new(&name);
    let source_text = Arc::new(std::fs::read_to_string(path)?);
    let source_type = SourceType::from_path(path).unwrap();
    // Memory arena where Semantic and Parser allocate objects
    let allocator = Allocator::default();

    // Parse the source text into an AST
    let parser_ret = Parser::new(&allocator, &source_text, source_type).parse();
    if !parser_ret.errors.is_empty() {
        let error_message: String = parser_ret
            .errors
            .into_iter()
            .map(|error| format!("{:?}", error.with_source_code(Arc::clone(&source_text))))
            .join("\n");
        println!("Parsing failed:\n\n{error_message}",);
        return Ok(());
    }

    let program = allocator.alloc(parser_ret.program);

    let semantic = SemanticBuilder::new(&source_text)
        .build_module_record(path, program)
        // Enable additional syntax checks not performed by the parser
        .with_check_syntax_error(true)
        // Inform Semantic about comments found while parsing
        .with_trivias(parser_ret.trivias)
        .build(program);

    if !semantic.errors.is_empty() {
        let error_message: String = semantic
            .errors
            .into_iter()
            .map(|error| format!("{:?}", error.with_source_code(Arc::clone(&source_text))))
            .join("\n");
        println!("Semantic analysis failed:\n\n{error_message}",);
    }

    Ok(())
}