Initial code for parsing from stream.

.gitignore

@@ -9,3 +9,4 @@ dist
 MANIFEST
 .tox
 .venv*
+*.egg-info/

lesscpy/lessc/lexer.py

@@ -460,12 +460,16 @@ class LessLexer:
             self.lexer.input(f.read())
         return self
 
-    def input(self, filename):
+    def input(self, file):
         """
-        Wrapper for file
+        Load lexer with content from `file` which can be a path or a file
+        like object.
         """
-        with open(filename) as f:
-            self.lexer.input(f.read())
+        if isinstance(file, basestring):
+            with open(file) as f:
+                self.lexer.input(f.read())
+        else:
+            self.lexer.input(file.read())
 
     def token(self):
         """

lesscpy/lessc/parser.py

@@ -77,7 +77,7 @@ class LessParser(object):
         self.result = None
         self.target = None
 
-    def parse(self, filename='', debuglevel=0):
+    def parse(self, filename='', filestream=None, debuglevel=0):
         """ Parse file.
         kwargs:
             filename (str): File to parse
@@ -87,8 +87,14 @@ class LessParser(object):
             print('Compiling target: %s' % filename, file=sys.stderr)
         self.scope.push()
         self.target = filename
+        if filestream:
+            content = filestream
+        else:
+            content = filename
+
         self.result = self.parser.parse(
-            filename, lexer=self.lex, debug=debuglevel)
+            content, lexer=self.lex, debug=debuglevel)
+
         self.post_parse()
 
     def post_parse(self):

test/test_lexer.py

@@ -0,0 +1,47 @@
+"""
+Unit tests for the lexer.
+"""
+from StringIO import StringIO
+from tempfile import NamedTemporaryFile
+import unittest
+
+
+from lesscpy.lessc.lexer import LessLexer
+
+
+class TestLessLexer(unittest.TestCase):
+    """
+    Unit tests for LessLexer
+    """
+
+    def setUp(self):
+        self.lexer = LessLexer()
+
+
+    def test_input_stream(self):
+        """
+        It can load content from a string.
+        """
+        file = StringIO("""
+            @simple-var: 1;
+            """)
+
+        self.lexer.input(file)
+
+        token = self.lexer.token()
+        self.assertEqual('@simple-var', token.value)
+
+    def test_input_path(self):
+        """
+        It can load content from a path.
+        """
+        file = NamedTemporaryFile()
+        file.write("""
+            @simple-var: 1;
+            """)
+        file.seek(0)
+
+        self.lexer.input(file.name)
+
+        token = self.lexer.token()
+        self.assertEqual('@simple-var', token.value)

test/test_parser.py

@@ -0,0 +1,31 @@
+"""
+Unit test for the parser.
+"""
+from StringIO import StringIO
+import unittest
+
+from lesscpy.lessc.parser import LessParser
+
+class TestLessParser(unittest.TestCase):
+    """
+    Unit tests for LessParser.
+    """
+
+    def setUp(self):
+        self.parser = LessParser()
+
+    def test_parse_stream(self):
+        """
+        It can parse input from a file stream.
+        """
+        stream = StringIO("""
+            @nice-blue: #5B83AD;
+            """)
+
+        self.parser.parse(filestream=stream)
+
+        # A single object is parser which is the expected variable.
+        self.assertEqual(1, len(self.parser.result))
+        variable = self.parser.result[0]
+        self.assertEqual('@nice-blue', variable.name)
+        self.assertEqual(['#5b83ad'], variable.value)