1 files changed, 108 insertions, 0 deletions
diff --git a/compilador/ast/expr.py b/compilador/ast/expr.py
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+++ b/compilador/ast/expr.py
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+from dataclasses import dataclass
+from enum import Enum, auto
+from typing import List, Optional
+
+from type import Type
+
+# An assignment expression
+#
+#     a = 10
+@dataclass
+class AssignExpr:
+    _object: Expr
+    value: Expr
+
+# A binary arithmetic operator
+class BinarithmOp(Enum):
+    BAND = '&'
+    BOR = '|'
+    DIV = '/'
+    GT = '>'
+    GTEQ = '>='
+    LAND = '&&'
+    LEQUAL = '=='
+    LESS = '<'
+    LESSEQ = '<='
+    LOR = '||'
+    MINUS = '-'
+    NEQUAL = '!='
+    PLUS = '+'
+    TIMES = '*'
+
+# A binary arithmetic expression.
+#
+#     a * b
+@dataclass
+class BinarithmExpr:
+    op: BinarithmOp
+    lvalue: Expr
+    rvalue: Expr
+
+# A function call expression.
+#
+#     foo(bar)
+@dataclass
+class CallExpr:
+    lvalue: Expr,
+    args: List[Expr]
+
+# A compound expression.
+#
+#     {
+#         foo;
+#         bar;
+#         // ...
+#     }
+@dataclass
+class CompoundExpr:
+    exprs: List[Expr]
+
+# A scalar value.
+Value = bool | str | int | type(None)
+
+# An integer constant.
+@dataclass
+class NumberConstant:
+    value: int
+
+# A constant expression.
+ConstantExpr = Value | NumberConstant
+
+# A for loop.
+#
+#     porcada (entero a = 0; a < b; a++) {}
+@dataclass
+class ForExpr:
+    bindings: Optional[Expr]
+    cond: Expr,
+    afterthought: Optional[Expr]
+    body: Expr
+
+# An if or if..else expression.
+#
+#    si (a) { } sino { }
+@dataclass
+class IfExpr:
+    cond: Expr,
+    tbranch: Expr,
+    fbranch: Optional[Expr]
+
+# A print statement.
+#
+#     imprimir a
+PrintExpr = Expr
+
+# A read statement.
+#
+#     leer a
+ReadExpr = Expr
+
+# A return statement.
+#
+#     return a
+ReturnExpr = Optional[Expr]
+
+# A Javañol expression
+Expr = (AssignExpr | BinarithmExpr | CallExpr | ConstantExpr |
+        ForExpr | IfExpr | CompoundExpr | PrintExpr |
+        ReadExpr | ReturnExpr)