pulse width

src/blip.rs

@@ -1,5 +1,37 @@
+use core::fmt;
+use std::fmt::Formatter;
 use crate::note::Note;
 
+pub enum PulseWidth {
+    /// 50% duty cycle
+    Half,
+    /// 25% duty cycle
+    Quarter,
+    /// 12.5% duty cycle
+    Eighth,
+}
+
+impl PulseWidth {
+    fn from(str: &str) -> Result<PulseWidth, crate::Error> {
+        match str {
+            "P2" => Ok(PulseWidth::Half),
+            "P4" => Ok(PulseWidth::Quarter),
+            "P8" => Ok(PulseWidth::Eighth),
+            _    => Err(crate::Error::PulseWidth),
+        }
+    }
+}
+
+impl fmt::Display for PulseWidth {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "SQR {}", match self {
+            PulseWidth::Half    => "P2",
+            PulseWidth::Quarter => "P4",
+            PulseWidth::Eighth  => "P8",
+        })
+    }
+}
+
 /// thanks to Rumple_Frumpkins from Bitsy Talk for his help in figuring out the blip format.
 #[derive(Debug, Clone, PartialEq)]
 pub struct Blip {
@@ -11,8 +43,34 @@ pub struct Blip {
     /// first value is milliseconds per note;
     /// second value is a modifier to the first note (add or subtract milliseconds)
     beat: [i16; 2],
-    /// I think this is probably pulse width. apparently the potential values are P2, P4 and P8.
-    square: String,
+    /// potential values are P2, P4 and P8.
+    pulse_width: PulseWidth,
     /// Notes can sound repeatedly, or just once as the blip fades out.
     repeat: bool,
 }
+
+impl From<&str> for Blip {
+    fn from(str: &str) -> Self {
+        let mut id = String::new();
+        let mut notes = vec![];
+        let mut name = None;
+        let mut envelope = [0; 5];
+        let mut beat = [0; 2];
+        let mut pulse_width = PulseWidth::Half;
+        let mut repeat = false;
+
+        for line in str.lines() {
+            if line.starts_with("BLIP ") {
+                id = line.replace("BLIP ", "");
+            } else if line.starts_with("NAME ") {
+                name = Some(line.replace("NAME ", ""));
+            } else if line.starts_with("ENV ") {
+                let envelope_temp: Vec<u8> = line.replace("ENV ", "").split(' ').map(|v| v.parse().unwrap()).collect();
+            } else {
+                // notes = line.split(',').map(|n| Note::from(n)).collect().unwrap();
+            }
+        }
+
+        Self { id, notes, name, envelope, beat, pulse_width, repeat }
+    }
+}