Create ParserL2.py

TinyC Level2/Intermediate Code Generator/ParserL2.py

@@ -0,0 +1,83 @@
+from sly import Parser
+from tinyclexlevel2 import tinyclexer
+from SymbolTable import SymbolTable, SymbolTableEntry
+from IntermediateCode import Quadruple, Variable, Constant, NewTemp
+from Program import Program
+from Function import Function
+
+class tinycparser(Parser):
+    tokens = tinyclexer.tokens
+    literals = tinyclexer.literals
+
+    precedence = (
+        ('left', '+', '-'),
+        ('left', '*', '/', '%'),
+    )
+
+    lst = []
+    localsymboltable = SymbolTable()
+    prog = Program()
+
+    @_('return_type ID "(" ")" "{" statements "}"')
+    def program(self, value):
+        fun = Function(int, value.ID)
+        fun.setIntermediateCodeList(value.statements)
+        self.prog.addFunctionDetails(value.ID, fun)
+        return True
+
+    @_('INT')
+    def return_type(self, value):
+        pass
+
+    @_('statement ";" statements')
+    def statements(self, value):
+        return value[2]
+
+    @_('statement ";"')
+    def statements(self, value):
+        return value[0]
+
+    @_('dec_st')
+    def statement(self, value):
+        pass
+
+    @_('ass_st')
+    def statement(self, value):
+        self.lst.append(value[0])
+        return self.lst
+
+    @_('print_st')
+    def statement(self, value):
+        pass
+
+    @_('type list_var')
+    def dec_st(self, value):
+        for i in value.list_var:
+            obj = SymbolTableEntry(i, int)
+            self.localsymboltable.addSymbol(obj)
+
+    @_('ID "," list_var')
+    def list_var(self, value):
+        return [value.ID] + value.list_var
+
+    @_('ID')
+    def list_var(self, value):
+        return [value.ID]
+
+    @_('expr "+" expr')
+    def expr(self, value):
+        t = NewTemp(int if value[0].getDatatype() == int and value[2].getDatatype() == int else double)
+        obj = Quadruple(value.expr0, value.expr1, t, '+')
+        self.lst.append(obj)
+        return obj
+
+    @_('INTCONST')
+    def expr(self, value):
+        obj = Constant(value[0])
+        return obj
+
+    @_('ID "=" expr')
+    def ass_st(self, value):
+        t = Variable(self.localsymboltable.getSymbolInTable(value.ID))
+        obj = Quadruple(value.expr, None, t, '=')
+        return obj