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1 files changed, 54 insertions, 0 deletions

diff --git a/ql/ast/visitors/dependency_visitor.py b/ql/ast/visitors/dependency_visitor.py
new file mode 100644
index 0000000..8bb81eb
--- /dev/null
+++ b/ql/ast/visitors/dependency_visitor.py
@@ -0,0 +1,54 @@
+from multimethods import multimethod
+
+from ql.ast.nodes.expressions.binary_operators.binary_operator import BinaryOperatorNode
+from ql.ast.nodes.expressions.literals.literal import LiteralNode
+from ql.ast.nodes.expressions.unary_operators.unary_operator import UnaryOperatorNode
+from ql.ast.nodes.expressions.variable import VariableNode
+from ql.ast.nodes.statements.form_statement import FormNode
+from ql.ast.nodes.statements.if_statement import IfNode
+from ql.ast.nodes.statements.question_statement import QuestionNode
+
+
+class DependencyVisitor:
+    def __init__(self):
+        self.__all_dependencies = []
+        self.__current_dependencies = []
+
+    @property
+    def identifier_dependencies(self):
+        return self.__all_dependencies
+
+    @multimethod(FormNode)
+    def visit(self, node):
+        for child in node.block:
+            child.accept(self)
+
+    @multimethod(IfNode)
+    def visit(self, node):
+        node.condition.accept(self)
+        for child in node.block:
+            child.accept(self)
+
+    @multimethod(QuestionNode)
+    def visit(self, node):
+        if node.computed:
+            self.__current_dependencies = []
+            node.answer.accept(self)
+            self.__all_dependencies.append((node.identifier, self.__current_dependencies, node.metadata))
+
+    @multimethod(BinaryOperatorNode)
+    def visit(self, node):
+        node.left_expression.accept(self)
+        node.right_expression.accept(self)
+
+    @multimethod(UnaryOperatorNode)
+    def visit(self, node):
+        node.expression.accept(self)
+
+    @multimethod(VariableNode)
+    def visit(self, node):
+        self.__current_dependencies.append(node.identifier)
+
+    @multimethod(LiteralNode)
+    def visit(self, node):
+        pass