another rust solution

3 files changed, 53 insertions, 0 deletions

diff --git a/PROT.rs b/PROT.rs
new file mode 100644
index 0000000..40979e1
--- /dev/null
+++ b/PROT.rs
@@ -0,0 +1,8 @@
+extern mod rosalind;
+use rosalind::io::input_line;
+use rosalind::protein::translate;
+
+fn main() {
+    let rna = input_line();
+    io::println(translate(rna));
+}
diff --git a/rosalind/mod.rc b/rosalind/mod.rc
index 3908b83..99fa08f 100644
--- a/rosalind/mod.rc
+++ b/rosalind/mod.rc
@@ -4,5 +4,6 @@
 
 mod dna;
 mod fasta;
+mod protein;
 mod io;
 mod str;
diff --git a/rosalind/protein.rs b/rosalind/protein.rs
new file mode 100644
index 0000000..7d56093
--- /dev/null
+++ b/rosalind/protein.rs
@@ -0,0 +1,44 @@
+use str = core::str;
+
+const STOP: char = -1 as char;
+
+fn translate(rna: &str) -> ~str {
+    assert str::len(rna) % 3 == 0;
+
+    let codons = str::len(rna) / 3;
+    let mut protein = str::with_capacity(codons);
+
+    for uint::range(0, codons) |i| {
+        let codon = str::slice(rna, i * 3, i * 3 + 3);
+        let amino = translate_single(codon);
+        if (amino == STOP) {
+            break;
+        }
+        str::push_char(&mut protein, amino);
+    }
+
+    protein
+}
+
+priv fn translate_single(codon: &str) -> char {
+    assert str::len(codon) == 3;
+    match codon {
+        "UUU" => 'F',     "CUU" => 'L',      "AUU" => 'I',      "GUU" => 'V',
+        "UUC" => 'F',     "CUC" => 'L',      "AUC" => 'I',      "GUC" => 'V',
+        "UUA" => 'L',     "CUA" => 'L',      "AUA" => 'I',      "GUA" => 'V',
+        "UUG" => 'L',     "CUG" => 'L',      "AUG" => 'M',      "GUG" => 'V',
+        "UCU" => 'S',     "CCU" => 'P',      "ACU" => 'T',      "GCU" => 'A',
+        "UCC" => 'S',     "CCC" => 'P',      "ACC" => 'T',      "GCC" => 'A',
+        "UCA" => 'S',     "CCA" => 'P',      "ACA" => 'T',      "GCA" => 'A',
+        "UCG" => 'S',     "CCG" => 'P',      "ACG" => 'T',      "GCG" => 'A',
+        "UAU" => 'Y',     "CAU" => 'H',      "AAU" => 'N',      "GAU" => 'D',
+        "UAC" => 'Y',     "CAC" => 'H',      "AAC" => 'N',      "GAC" => 'D',
+        "UAA" => STOP,    "CAA" => 'Q',      "AAA" => 'K',      "GAA" => 'E',
+        "UAG" => STOP,    "CAG" => 'Q',      "AAG" => 'K',      "GAG" => 'E',
+        "UGU" => 'C',     "CGU" => 'R',      "AGU" => 'S',      "GGU" => 'G',
+        "UGC" => 'C',     "CGC" => 'R',      "AGC" => 'S',      "GGC" => 'G',
+        "UGA" => STOP,    "CGA" => 'R',      "AGA" => 'R',      "GGA" => 'G',
+        "UGG" => 'W',     "CGG" => 'R',      "AGG" => 'R',      "GGG" => 'G',
+        _ => fail ~"Unknown codon",
+    }
+}