Started work on keyword arguments.

bparser.py

@@ -42,6 +42,7 @@ tokens = ['LPAREN',
           'INT',
           'EOL_CONTINUE',
           'EOL',
+          'COLON',
           ] + list(reserved.values())
 
 t_ASSIGN = '='
@@ -56,6 +57,7 @@ t_RBRACE = '\}'
 t_COMMENT = '\#[^\n]*'
 t_COMMA = ','
 t_DOT = '\.'
+t_COLON = ':'
 
 t_ignore = ' \t'
 
@@ -162,19 +164,32 @@ def p_statement_expression(t):
     'statement : expression'
     t[0] = nodes.statement_from_expression(t[1])
 
+
 def p_args_multiple(t):
     'args : statement COMMA args'
     args = t[3]
     args.prepend(t[1])
     t[0] = args
 
-def p_args_single(t):
+def p_kwargs_multiple(t):
+    'args : expression COLON statement COMMA args'
+    args = t[5]
+    args.add_kwarg(t[1], t[3])
+    t[0] = args
+
+def p_args_single_pos(t):
     'args : statement'
     args = nodes.Arguments(t.lineno(1))
     args.prepend(t[1])
     t[0] = args
 
-def p_args_none(t):
+def p_args_single_kw(t):
+    'args : expression COLON statement'
+    a = nodes.Arguments(t.lineno(1))
+    a.set_kwarg(t[1], t[2])
+    t[0] = a
+
+def p_posargs_none(t):
     'args :'
     t[0] = nodes.Arguments(t.lineno(0))
 

interpreter.py

@@ -534,6 +534,8 @@ class Interpreter():
         for a in args:
             if isinstance(a, list):
                 result = result + self.flatten(a)
+            if isinstance(a, nodes.StringStatement):
+                result.append(a.get_value())
             else:
                 result.append(a)
         return result
@@ -559,9 +561,9 @@ class Interpreter():
 
     def function_call(self, node):
         func_name = node.get_function_name()
-        args = self.reduce_arguments(node.arguments)
+        (posargs, kwargs) = self.reduce_arguments(node.arguments)
         if func_name in self.funcs:
-            return self.funcs[func_name](node, args)
+            return self.funcs[func_name](node, posargs)
         else:
             raise InvalidCode('Unknown function "%s".' % func_name)
 
@@ -588,23 +590,26 @@ class Interpreter():
         self.set_variable(var_name, value)
         return value
 
+    def reduce_single(self, arg):
+        if isinstance(arg, nodes.AtomExpression) or isinstance(arg, nodes.AtomStatement):
+            return self.get_variable(arg.value)
+        elif isinstance(arg, nodes.StringExpression) or isinstance(arg, nodes.StringStatement):
+            return arg.get_value()
+        elif isinstance(arg, nodes.FunctionCall):
+            return self.function_call(arg)
+        elif isinstance(arg, nodes.MethodCall):
+            return self.method_call(arg)
+        else:
+            raise InvalidCode('Line %d: Irreducible argument.' % args.lineno())
+
     def reduce_arguments(self, args):
         assert(isinstance(args, nodes.Arguments))
-        reduced = []
-        for arg in args.arguments:
-            if isinstance(arg, nodes.AtomExpression) or isinstance(arg, nodes.AtomStatement):
-                r = self.get_variable(arg.value)
-            elif isinstance(arg, nodes.StringExpression) or isinstance(arg, nodes.StringStatement):
-                r = arg.get_value()
-            elif isinstance(arg, nodes.FunctionCall):
-                r  = self.function_call(arg)
-            elif isinstance(arg, nodes.MethodCall):
-                r = self.method_call(arg)
-            else:
-                raise InvalidCode('Line %d: Irreducible argument.' % args.lineno())
-            reduced.append(r)
-        assert(len(reduced) == len(args))
-        return reduced
+        reduced_pos = [self.reduce_single(arg) for arg in args.arguments]
+        for key in args.kwargs.keys():
+            if not isinstance(key, str):
+                raise InvalidArguments('Line %d: keyword argument name is not a string.' % args.lineno())
+        reduced_kw = {}
+        return (reduced_pos, reduced_kw)
 
     def method_call(self, node):
         object_name = node.object_name.get_value()

nodes.py

@@ -170,13 +170,26 @@ class Arguments(Statement):
     def __init__(self, lineno):
         Statement.__init__(self, lineno)
         self.arguments = []
+        self.kwargs = {}
+        self.order_error = False
 
     def prepend(self, statement):
         self.arguments = [statement] + self.arguments
 
-    def __len__(self):
+    def set_kwarg(self, name, value):
+        if self.num_args() > 0:
+            self.order_error = True
+        self.kwargs[name.get_value()] = value
+
+    def num_args(self):
         return len(self.arguments)
 
+    def num_kwargs(self):
+        return len(self.kwargs)
+
+    def __len__(self):
+        return self.num_args() # Fixme
+
 def statement_from_expression(expr):
     if isinstance(expr, AtomExpression):
         return AtomStatement(expr.value, expr.lineno())

test cases/1 trivial/builder.txt

@@ -1,3 +1,7 @@
 project('trivial test', 'c')
-exe = executable('trivialprog', 'trivial.c')
+
+sources = 'trivial.c'
+
+exe = executable('trivialprog', sources : sources)
+
 add_test('runtest', exe)