1 files changed, 117 insertions, 0 deletions
diff --git a/src/bin/br/asm.rs b/src/bin/br/asm.rs
new file mode 100644
index 0000000..cb8c35a
--- /dev/null
+++ b/src/bin/br/asm.rs
@@ -0,0 +1,117 @@
+use crate::*;
+
+use bedrock_asm::*;
+use log::{info, fatal};
+
+use std::io::{Read, Write};
+
+
+pub fn main(mut args: Switchboard) {
+    let source_path = args.positional("source").as_path_opt().map(
+        |p| p.canonicalize().unwrap_or(p));
+    let destination_path = args.positional("source").as_path_opt();
+    let extension = args.positional("extension").default("brc").as_string();
+
+    let no_libs = args.named("no-libs").as_bool();
+    let no_project_libs = args.named("no-project-libs").as_bool();
+    let no_environment_libs = args.named("no-env-libs").as_bool();
+
+    let print_tree = args.named("tree").as_bool();
+    let dry_run = args.named("dry-run").short('n').as_bool();
+    let only_resolve = args.named("resolve").as_bool();
+    let export_symbols = args.named("symbols").as_bool();
+
+    // -----------------------------------------------------------------------
+
+    let mut compiler = if let Some(path) = &source_path {
+        info!("Reading program source from {path:?}");
+        Compiler::from_path(path).unwrap_or_else(|err| match err {
+            FileError::InvalidExtension => fatal!(
+                "File {path:?} has invalid extension, must be '.{extension}'"),
+            FileError::NotFound => fatal!(
+                "File {path:?} was not found"),
+            FileError::InvalidUtf8 => fatal!(
+                "File {path:?} does not contain valid UTF-8 text"),
+            FileError::NotReadable => fatal!(
+                "File {path:?} is not readable"),
+            FileError::IsADirectory => fatal!(
+                "File {path:?} is a directory"),
+            FileError::Unknown => fatal!(
+                "Unknown error while attempting to read from {path:?}")
+        })
+    } else {
+        let mut source_code = String::new();
+        info!("Reading program source from standard input");
+        if let Err(err) = std::io::stdin().read_to_string(&mut source_code) {
+            fatal!("Could not read from standard input\n{err:?}");
+        }
+        Compiler::from_string(source_code, "<standard input>")
+    };
+    if compiler.error().is_some() && !no_libs && !no_project_libs {
+        compiler.include_libs_from_parent(&extension);
+    }
+    if compiler.error().is_some() && !no_libs && !no_environment_libs {
+        compiler.include_libs_from_path_variable("BEDROCK_LIBS", &extension);
+    }
+
+    if print_tree {
+        compiler.resolver.hierarchy().report()
+    }
+    if let Some(error) = compiler.error() {
+        error.report();
+        std::process::exit(1);
+    }
+    let merged_source = compiler.get_compiled_source().unwrap_or_else(
+        |error| { error.report(); std::process::exit(1); }
+    );
+    if only_resolve && !dry_run {
+        write_bytes_and_exit(merged_source.as_bytes(), destination_path.as_ref());
+    }
+
+    // -----------------------------------------------------------------------
+    // PARSE semantic tokens from merged source code
+    let path = Some("<merged source>");
+    let mut semantic_tokens = generate_semantic_tokens(&merged_source, path);
+    if print_semantic_errors(&semantic_tokens, &merged_source) {
+        std::process::exit(1);
+    };
+
+    // -----------------------------------------------------------------------
+    // GENERATE symbols file and bytecode
+    let bytecode = generate_bytecode(&mut semantic_tokens);
+
+    if export_symbols && !dry_run {
+        if let Some(path) = &destination_path {
+            let mut symbols_path = path.to_path_buf();
+            symbols_path.set_extension("br.sym");
+            let symbols = generate_symbols_file(&semantic_tokens);
+            match std::fs::write(&symbols_path, symbols) {
+                Ok(_) => info!("Saved debug symbols to {symbols_path:?}"),
+                Err(err) => info!("Could not write symbols to {symbols_path:?}\n{err:?}"),
+            }
+        }
+    }
+
+    let length = bytecode.len();
+    let percentage = (length as f32 / 65536.0 * 100.0).round() as u16;
+    info!("Assembled program in {length} bytes ({percentage}% of maximum)");
+
+    if !dry_run {
+        write_bytes_and_exit(&bytecode, destination_path.as_ref());
+    }
+}
+
+
+fn write_bytes_and_exit<P: AsRef<Path>>(bytes: &[u8], path: Option<&P>) -> ! {
+    match path {
+        Some(path) => match std::fs::write(path, bytes) {
+            Ok(_) => info!("Wrote output to {:?}", path.as_ref()),
+            Err(err) => fatal!("Could not write to {:?}\n{err:?}", path.as_ref()),
+        }
+        None => match std::io::stdout().write_all(bytes) {
+            Ok(_) => info!("Wrote output to standard output"),
+            Err(err) => fatal!("Could not write to standard output\n{err:?}"),
+        }
+    }
+    std::process::exit(0);
+}