Rewrite entire assembler

The language is now more general, the code is better structured, error
reporting is more detailed, and many new language features have
been implemented:
- conditional blocks
- first-class strings
- more expression operators
- binary literals
- negative values
- invocations in constant expressions

1 files changed, 29 insertions, 0 deletions

diff --git a/src/formats/raw.rs b/src/formats/raw.rs
new file mode 100644
index 0000000..ecc6473
--- /dev/null
+++ b/src/formats/raw.rs
@@ -0,0 +1,29 @@
+use crate::*;
+
+
+pub fn format_raw(segments: &[Segment], width: Option<u32>) -> Result<Vec<u8>, FormatError> {
+    let Some(width) = width.or_else(|| calculate_fixed_width(&segments)) else {
+        return Err(FormatError::ExpectedFixedWidth);
+    };
+
+    let mut address = 0;
+    let bytes_per_word = ((width + 7) / 8) as usize;
+    let mut bytes = Vec::new();
+
+    for segment in segments {
+        // Pad to the segment start address.
+        let padding = segment.address.saturating_sub(address);
+        bytes.resize(bytes.len() + (padding * bytes_per_word), 0);
+        for word in &segment.words {
+            // Decompose word value into bytes.
+            let value = word.value.value;
+            for i in (0..bytes_per_word).rev() {
+                let byte = (value >> (i*8) & 0xff) as u8;
+                bytes.push(byte);
+            }
+            address += 1;
+        }
+    }
+
+    return Ok(bytes);
+}