4 files changed, 44 insertions, 3 deletions
diff --git a/interpreter.py b/interpreter.py
index c3d14b1..50c7a40 100755
--- a/interpreter.py
+++ b/interpreter.py
@@ -273,6 +273,8 @@ class Interpreter():
             return self.method_call(cur)
         elif isinstance(cur, nodes.StringStatement):
             return cur
+        elif isinstance(cur, nodes.BoolStatement):
+            return cur
         else:
             raise InvalidCode("Unknown statement in line %d." % cur.lineno())
 
@@ -407,7 +409,8 @@ class Interpreter():
     def is_assignable(self, value):
         if isinstance(value, InterpreterObject) or \
             isinstance(value, environment.PkgConfigDependency) or\
-            isinstance(value, nodes.StringStatement):
+            isinstance(value, nodes.StringStatement) or\
+            isinstance(value, nodes.BoolStatement):
             return True
         return False
     
diff --git a/nodes.py b/nodes.py
index d58729a..4bbaa5d 100644
--- a/nodes.py
+++ b/nodes.py
@@ -27,6 +27,15 @@ class Expression(Node):
 class Statement(Node):
     pass
 
+class BoolExpression(Expression):
+    def __init__(self, value, lineno):
+        Expression.__init__(self, lineno)
+        self.value = value
+        assert(isinstance(value, bool))
+    
+    def get_value(self):
+        return self.value
+
 class AtomExpression(Expression):
     def __init__(self, value, lineno):
         Expression.__init__(self, lineno)
@@ -49,6 +58,15 @@ class AtomStatement(Statement):
     def get_value(self):
         return self.value
 
+class BoolStatement(Statement):
+    def __init__(self, value, lineno):
+        Statement.__init__(self, lineno)
+        assert(isinstance(value, bool))
+        self.value = value
+
+    def get_value(self):
+        return self.value
+
 class StringStatement(Statement):
     def __init__(self, value, lineno):
         assert(type(value) == type(''))
@@ -107,4 +125,6 @@ def statement_from_expression(expr):
         return AtomStatement(expr.value, expr.lineno())
     if isinstance(expr, StringExpression):
         return StringStatement(expr.value, expr.lineno())
+    if isinstance(expr, BoolExpression):
+        return BoolStatement(expr.value, expr.lineno())
     raise RuntimeError('Can not convert unknown expression to a statement.')
diff --git a/parser.py b/parser.py
index 1d59800..a6af003 100755
--- a/parser.py
+++ b/parser.py
@@ -18,6 +18,9 @@ import ply.lex as lex
 import ply.yacc as yacc
 import nodes
 
+reserved = {'true' : 'TRUE',
+            'false' : 'FALSE'}
+
 tokens = ['LPAREN',
           'RPAREN',
           'LBRACKET',
@@ -32,7 +35,7 @@ tokens = ['LPAREN',
           'STRING',
           'EOL_CONTINUE',
           'EOL',
-          ]
+          ] + list(reserved.values())
 
 t_EQUALS = '='
 t_LPAREN = '\('
@@ -41,13 +44,17 @@ t_LBRACKET = '\['
 t_RBRACKET = '\]'
 t_LBRACE = '\{'
 t_RBRACE = '\}'
-t_ATOM = '[a-zA-Z][_0-9a-zA-Z]*'
 t_COMMENT = '\#[^\n]*'
 t_COMMA = ','
 t_DOT = '\.'
 
 t_ignore = ' \t'
 
+def t_ATOM(t):
+    '[a-zA-Z][_0-9a-zA-Z]*'
+    t.type = reserved.get(t.value, 'ATOM')
+    return t
+
 def t_STRING(t):
     "'[^']*'"
     t.value = t.value[1:-1]
@@ -88,6 +95,14 @@ def p_expression_atom(t):
     'expression : ATOM'
     t[0] = nodes.AtomExpression(t[1], t.lineno(1))
 
+def p_expression_bool(t):
+    '''expression : TRUE
+                  | FALSE'''
+    if t[1] == 'true':
+        t[0] = nodes.BoolExpression(True, t.lineno(1))
+    else:
+        t[0] = nodes.BoolExpression(False, t.lineno(1))
+
 def p_expression_string(t):
     'expression : STRING'
     t[0] = nodes.StringExpression(t[1], t.lineno(1))
diff --git a/test cases/17 if/builder.txt b/test cases/17 if/builder.txt
new file mode 100644
index 0000000..ca994d0
--- /dev/null
+++ b/test cases/17 if/builder.txt
@@ -0,0 +1,3 @@
+project('if test', 'c')
+
+var = true