From d3460d5c0af40b5b8e3aba0364e6748dd93dea52 Mon Sep 17 00:00:00 2001
From: ayrton <achilibe@ualberta.ca>
Date: Sun, 19 Nov 2023 11:40:07 -0700
Subject: [PATCH] initial python unparsing

Took 31 minutes
---
 ast_parser/python_unparser.py          | 108 ++++++++++++++---
 ast_parser/test/test_python_unparse.py | 158 +++++++++++++++++++++++++
 2 files changed, 251 insertions(+), 15 deletions(-)
 create mode 100644 ast_parser/test/test_python_unparse.py

diff --git a/ast_parser/python_unparser.py b/ast_parser/python_unparser.py
index d9dd415..ce6b182 100644
--- a/ast_parser/python_unparser.py
+++ b/ast_parser/python_unparser.py
@@ -1,19 +1,74 @@
+import warnings
 from xml.etree import ElementTree as ET
 
+from ast_parser.gaz_unparser import GazUnparser
 from ast_parser.general_unparser import GeneralUnparser
 from constants import *
 
 
-class PythonUnparser(GeneralUnparser):
+def to_python_type(ty):
+    if ty == GAZ_INT_KEY:
+        return "int"
+    elif ty == GAZ_BOOL_KEY:
+        return "bool"
+    elif ty == GAZ_FLOAT_KEY:
+        return "float"
+    elif ty == GAZ_CHAR_KEY:
+        return "str"
+    elif ty == GAZ_STRING_KEY:
+        return "str"
+    else:
+        raise Exception("Unknown type: " + ty)
 
-    def unparse_xhs(self, element_in: ET.Element):
-        pass
+
+def to_python_op(param):
+    if param == "negation" or param == "subtraction":
+        return "-"
+    elif param == "addition":
+        return "+"
+    elif param == "multiplication":
+        return "*"
+    elif param == "division":
+        return "/"
+    elif param == "modulus":
+        return "%"
+    elif param == "power":
+        return "**"
+    elif param == "equality":
+        return "=="
+    elif param == "inequality":
+        return "!="
+    elif param == "less-than":
+        return "<"
+    elif param == "less-than-or-equal":
+        return "<="
+    elif param == "greater-than":
+        return ">"
+    elif param == "greater-than-or-equal":
+        return ">="
+    else:
+        warnings.warn("Warning, unknown operator: " + param)
+        return param
+
+
+class PythonUnparser(GazUnparser):
+    def __init__(self, ast: ET.Element, debug=False):
+        super().__init__(ast, debug)
 
     def unparse_top_block(self, element_in: ET.Element):
         pass
 
-    def unparse_block(self, element_in: ET.Element):
-        pass
+    def unparse_block(self, node: ET.Element):
+        self.source += "\n"
+        self.indentation += 4
+        for child in node:
+            self.unparse_node(child)
+        self.indentation -= 4
+
+        if node.get(GAZ_TY_KEY) is None:
+            self.source += "\n\n"
+        elif node.get(GAZ_TY_KEY) in [GAZ_TRUE_BLOCK_TAG, GAZ_FALSE_BLOCK_TAG]:
+            self.source += ""
 
     def unparse_routine(self, element_in: ET.Element):
         pass
@@ -28,17 +83,34 @@ class PythonUnparser(GeneralUnparser):
         pass
 
     def unparse_declaration(self, element_in: ET.Element):
-        pass
+        variable = element_in.find(GAZ_VAR_TAG)
+        rhs = element_in.find(GAZ_RHS_TAG)
+        self.unparse_variable(variable, True)
+        self.source += " = "
+        self.unparse_node(rhs)
+        self.source += "\n"
 
     def unparse_operator(self, element_in: ET.Element):
-        pass
+        self.unparse_xhs(element_in.find(GAZ_LHS_TAG))
+        self.source += " {} ".format(to_python_op(element_in.get("op")))
+        self.unparse_xhs(element_in.find(GAZ_RHS_TAG))
+
+    def unparse_instream(self, node):
+        for child in node:
+            self.unparse_node(child)
+
+        self.source += "input()\n".format(GAZ_IN_STREAM)
+
+    def unparse_outstream(self, node):
+        self.source += "print("
+        for child in node:
+            self.unparse_node(child)
+
+        self.source += ", end='')\n".format(GAZ_OUT_STREAM)
 
     def unparse_unary(self, element_in: ET.Element):
         pass
 
-    def unparse_stream(self, element_in: ET.Element):
-        pass
-
     def unparse_assignment(self, element_in: ET.Element):
         pass
 
@@ -52,11 +124,17 @@ class PythonUnparser(GeneralUnparser):
         pass
 
     def unparse_return(self, element_in: ET.Element):
-        pass
+        self.source += "return "
+        for child in element_in:
+            self.unparse_node(child)
+        self.source += "\n"
 
-    def unparse_literal(self, element_in: ET.Element):
-        pass
+    def unparse_variable(self, element_in: ET.Element, is_declaration=False):
+        if is_declaration:
+            ty = to_python_type(element_in.get(GAZ_TY_KEY))
+            name = element_in.get(GAZ_NAME_KEY)
 
-    def unparse_variable(self, element_in: ET.Element):
-        pass
+            self.source += f"{name}: {ty}"
+        else:
+            super().unparse_variable(element_in)
 
diff --git a/ast_parser/test/test_python_unparse.py b/ast_parser/test/test_python_unparse.py
new file mode 100644
index 0000000..f9ce0c0
--- /dev/null
+++ b/ast_parser/test/test_python_unparse.py
@@ -0,0 +1,158 @@
+import unittest
+
+import xml.etree.ElementTree as ET
+
+from ast_parser.python_unparser import PythonUnparser
+
+
+class TestPythonUnparseCode(unittest.TestCase):
+
+    def test_unparse_variable_regular(self):
+        input = '<variable mut="var" type="int" name="a" ref_name="_lsiyjvtbvnpmlml"/>'
+        parser = PythonUnparser(ET.fromstring(input), True)
+        parser.source = ""
+        parser.unparse_node(parser.xml)
+        self.assertIsNotNone(parser.source)
+        self.assertEqual("a", parser.source)
+
+    def test_unparse_variable_declaration(self):
+        input = '<variable mut="var" type="int" name="a" ref_name="_lsiyjvtbvnpmlml"/>'
+        parser = PythonUnparser(ET.fromstring(input), True)
+        parser.source = ""
+        parser.unparse_variable(parser.xml, True)
+        self.assertIsNotNone(parser.source)
+        self.assertEqual("a: int", parser.source)
+
+
+    def test_unparse_rhs_single(self):
+        input = '<rhs><literal type="int" value="1" /></rhs>'
+        parser = PythonUnparser(ET.fromstring(input), True)
+        parser.source = ""
+        parser.unparse_node(parser.xml)
+        self.assertIsNotNone(parser.source)
+        self.assertEqual("1", parser.source)
+
+    def test_unparse_declaration(self):
+        input = '<declaration><variable mut="var" type="int" name="a" ref_name="_lsiyjvtbvnpmlml"/><rhs><literal type="int" value="1" /></rhs></declaration>'
+        parser = PythonUnparser(ET.fromstring(input), True)
+        parser.source = ""
+        parser.unparse_node(parser.xml)
+        self.assertIsNotNone(parser.source)
+        self.assertEqual("a: int = 1\n", parser.source)
+
+    def test_unparse_stream(self):
+        input = ' <stream type="std_output">                <operator op="*" type="unset">                    <lhs>                        <variable mut="var" type="int" name="a" ref_name="_lsiyjvtbvnpmlml"/>                    </lhs>                    <rhs>                        <literal type="int" value="42" />                    </rhs>                </operator></stream>'
+        parser = PythonUnparser(ET.fromstring(input), True)
+        parser.source = ""
+        parser.unparse_node(parser.xml)
+        self.assertIsNotNone(parser.source)
+        self.assertEqual("print(a * 42, end='')\n", parser.source)
+
+    def test_unparse_block(self):
+        input = '<block> <declaration> <variable mut="var" type="int" name="a" ref_name="_lsiyjvtbvnpmlml"/> <rhs> <literal type="int" value="1" /> </rhs> </declaration> <stream type="std_output"> <operator op="*" type="unset"> <lhs> <variable mut="var" type="int" name="a" ref_name="_lsiyjvtbvnpmlml"/> </lhs> <rhs> <literal type="int" value="42" /> </rhs> </operator> </stream> <return> <literal type="int" value="0" /> </return> </block>'
+        parser = PythonUnparser(ET.fromstring(input), True)
+        parser.source = ""
+        parser.unparse_node(parser.xml)
+        self.assertIsNotNone(parser.source)
+        self.assertEqual("\n    a: int = 1\n    print(a * 42, end='')\n    return 0\n\n\n", parser.source)
+
+    def test_unparse_assignment(self):
+        with open("xml/assignment.xml", "r") as f:
+            input = f.read()
+        parser = PythonUnparser(ET.fromstring(input), True)
+        parser.source = ""
+        parser.unparse_node(parser.xml)
+        self.assertIsNotNone(parser.source)
+        self.assertEqual("C = 30;\n", parser.source)
+
+    def test_unparse_conditional(self):  # TODO test the else-if statements
+        with open("xml/conditional.xml", "r") as f:
+            input = f.read()
+
+        with open("xml/conditional.out", "r") as f:
+            output = f.read()
+
+        parser = PythonUnparser(ET.fromstring(input), True)
+        parser.source = ""
+
+        parser.unparse_node(parser.xml)
+
+        self.assertIsNotNone(parser.source)
+        self.assertEqual(output, parser.source)
+
+    def test_unparse_loop(self):
+        with open("xml/loop.xml", "r") as f:
+            input = f.read()
+
+        with open("xml/loop.out", "r") as f:
+            output = f.read()
+
+        parser = PythonUnparser(ET.fromstring(input), True)
+        parser.source = ""
+        parser.unparse_node(parser.xml)
+        self.assertIsNotNone(parser.source)
+        self.assertEqual(output, parser.source)
+
+    def test_unparse_operation_single(self):
+        input = '<operator op="multiplication" type="unset"> <lhs> <variable mut="var" type="int" name="a" ref_name="_lsiyjvtbvnpmlml"/> </lhs> <rhs> <literal type="int" value="42" /> </rhs> </operator>'
+        parser = PythonUnparser(ET.fromstring(input), True)
+        parser.source = ""
+        parser.unparse_node(parser.xml)
+        self.assertIsNotNone(parser.source)
+        self.assertEqual("a * 42", parser.source)
+
+    def test_unparse_return(self):
+        input = '<return> <literal type="int" value="0" /> </return>'
+        parser = PythonUnparser(ET.fromstring(input), True)
+        parser.source = ""
+        parser.unparse_node(parser.xml)
+        self.assertIsNotNone(parser.source)
+        self.assertEqual("return 0\n", parser.source)
+
+    def test_unparse_unary(self):
+        with open("xml/unary.xml", "r") as f:
+            input = f.read()
+
+        with open("xml/unary.out", "r") as f:
+            output = f.read()
+
+        parser = PythonUnparser(ET.fromstring(input), True)
+        parser.source = ""
+        parser.unparse_node(parser.xml)
+        self.assertIsNotNone(parser.source)
+        self.assertEqual(output, parser.source)
+
+    def test_unparse_routine(self):
+        input = '<procedure name="main" ref_name="_jemrvvseyj" return_type="int" args="()" ><block><declaration><variable mut="var" type="int" name="a" ref_name="_lsiyjvtbvnpmlml"/><rhs><literal type="int" value="1" /></rhs></declaration><stream type="std_output"><operator op="*" type="unset"><lhs><variable mut="var" type="int" name="a" ref_name="_lsiyjvtbvnpmlml"/></lhs><rhs><literal type="int" value="42" /></rhs></operator></stream><return><literal type="int" value="0" /></return></block></procedure>'
+        parser = PythonUnparser(ET.fromstring(input), True)
+        parser.source = ""
+        parser.unparse_node(parser.xml)
+        self.assertIsNotNone(parser.source)
+        i = ' ' * parser.indentation
+        self.assertEqual("procedure main() returns integer {\n    var integer a = 1;\n    a * 42 -> std_output;\n    return 0;\n}\n\n", parser.source)
+
+    def test_unparse_args(self):
+        with open("xml/many_args.xml", 'r') as f:
+            input = f.read()
+        with open("xml/many_args.out", 'r') as f:
+            output = f.read()
+        parser = PythonUnparser(ET.fromstring(input), True)
+        parser.source = ""
+        parser.unparse_node(parser.xml)
+        self.assertIsNotNone(parser.source)
+        self.assertEqual(output, parser.source)
+
+
+    def test_unparse_code(self):
+        with open("xml/test.xml", "r") as input:
+            parser = PythonUnparser(ET.fromstring(input.read()), True)
+            parser.unparse()
+            self.assertIsNotNone(parser.source)
+
+        with open("input.in", "r") as input:
+            i = input.read()
+            self.assertEqual(i, parser.source)
+
+
+if __name__ == "__main__":
+    unittest.main()
\ No newline at end of file