browser/js: Uniformize the way we deal with sites limiting the number of input sequences

browser/js/crossDomain.js

@@ -136,9 +136,7 @@ function imgtPostForSegmenter(species, data, system, segmenter, override_imgt_op
 
     //process to first 10 sequences then alert user about the remaining part
     if (nb > 10) {
-        pos = nth_ocurrence(data, '>', 11);
-        var newdata = data.substr(pos);
-        data = data.substr(0, pos - 1);
+        data = getNFirstSequences(data, 10);
         var msg = "The first 10 sequences were sent to IMGT/V-QUEST."
 
         console.log({
@@ -395,6 +393,11 @@ blastInput.NCBIBLAST_BLASTN__dust            = 1;
 blastInput.NCBIBLAST_BLASTN__repeat_mask     = 1;
 
 function blastPost(species, data, system) {
+    if (self.m.getSelected().length > 30) {
+        data = getNFirstSequences(data, 30);
+        console.log({"type": "flash", "msg": "A maximum of 30 clones are allowed by Blast. Only the first 30 sequences will be sent" , "priority": 1});
+        
+    }
 
     blastInput.query_sequence = data;
 

browser/js/segmenter.js

@@ -248,11 +248,7 @@ Segment.prototype = {
             span.setAttribute('title', 'Send sequences to Ensembl Blast and see the results in a new tab')
             span.className = "button";
             span.onclick = function () {
-                if (self.m.getSelected().length > 30) {
-                    console.log({"type": "flash", "msg": "A maximum of 30 clones are allowed by Blast" , "priority": 1});
-                } else {
                 self.sendTo('blast');
-                }
             };
             span.appendChild(document.createTextNode("❯ to Blast"));
             div_menu.appendChild(span);

browser/js/tools.js

@@ -712,4 +712,19 @@ function openAndFillNewTab (content){
         html: content
     }).appendTo(w.document.body);
     return
-}
\ No newline at end of file
+}
+
+/**
+ * @param {data} a string containing a multi-FASTA
+ * @param {n} the number of sequences to keep
+ * @return return a string containing at most {n} FASTA sequences.
+ *         if {n} is negative or null return {data} itself
+ */
+function getNFirstSequences(data, n) {
+    var pos = nth_ocurrence(data, '>', n+1);
+    if (pos) {
+        return data.substr(0, pos);
+    } else {
+        return data;
+    }    
+}

browser/test/QUnit/testFiles/tools_test.js

@@ -416,3 +416,11 @@ QUnit.test("Sort list locus", function(assert) {
     assert.deepEqual(list_test_2, wait_test_2, "list2 is correctly sorted")
     }
 );
+
+QUnit.test("Get n first sequences", function(assert) {
+    seqs=">seq1\nAT\n>seq2\nTC\n>seq3\nCC\n";
+    assert.equal(getNFirstSequences(seqs, 1), ">seq1\nAT\n");
+    assert.equal(getNFirstSequences(seqs, 0), seqs);
+    assert.equal(getNFirstSequences(seqs, -1), seqs);
+    assert.equal(getNFirstSequences(seqs, 2), ">seq1\nAT\n>seq2\nTC\n");
+});