Cython: added tab formatter and parser (for obi export)

python/obitools3/format/tab.pxd

@@ -0,0 +1,8 @@
+#cython: language_level=3
+
+cdef class TabFormat:
+    cdef bint header
+    cdef bint first_line
+    cdef bytes NAString
+    cdef list tags
+    cdef bytes sep

python/obitools3/format/tab.pyx

@@ -0,0 +1,44 @@
+#cython: language_level=3
+
+cimport cython
+from obitools3.dms.view.view cimport Line
+from obitools3.utils cimport bytes2str_object, str2bytes, tobytes
+from obitools3.dms.column.column cimport Column_line
+
+
+cdef class TabFormat:
+    
+    def __init__(self, header=True, bytes NAString=b"NA", bytes sep=b"\t"):
+        self.header = True
+        self.first_line = True
+        self.NAString = NAString
+        self.sep = sep
+        
+    @cython.boundscheck(False)    
+    def __call__(self, object data):
+        
+        line = []
+        
+        if self.first_line:
+            self.tags = [k for k in data.keys()]
+        
+        for k in self.tags:
+            
+            if self.header and self.first_line:
+                value = tobytes(k)
+            else:
+                value = data[k]
+                if value is not None:
+                    if type(value) == Column_line:
+                        value = value.bytes()
+                    else:
+                        value = str2bytes(str(bytes2str_object(value))) # genius programming
+                if value is None:
+                    value = self.NAString
+            
+            line.append(value)   
+      	
+        if self.first_line:
+            self.first_line = False
+      		
+        return self.sep.join(value for value in line)