Déclaration et affichage

examples/simple.spf

@@ -1,8 +1,13 @@
-entier pi = 314;
-entier pi2 = 3;
+texte nom = "anthony";
+entier age = 23;
+booléen majeur = vrai;
 
-pi = 3;
+majeur = faux;
 
-tant que pi vaut pi2 faire {
-	afficher "bonjour";
-}
+afficher nom, age, majeur;
+
+
+#TODO: Ces lignes devraient donner une erreur
+majeur = 42;
+
+afficher majeur;

spf.lark

@@ -1,66 +1,66 @@
 start: (instruction)*
 
-instruction: type declaration TERMINAL
-		   | assignation TERMINAL
+instruction: declaration ";"
+		   | assignation ";"
+		   | SHOW_KW expression ("," expression)* ";" -> afficher
+		   | ADD_KW expression "dans" VARIABLE ";"
 		   | controls
-		   | SHOW_KW expression ("," expression)* TERMINAL
-		   | ADD_KW expression "dans" VARIABLE TERMINAL
 
-expression: expressionleft // TODO: priorité des op certainement fausse
-          | op
+expression: expressionleft // TODO: priorité des operator certainement fausse
+          | operator
 
 expressionleft: literal 
               | list
               | range
-			  | VARIABLE
+			  | VARIABLE -> variable
+			  | "(" expression ")"
 
-op: expressionleft SAME_OP expression
+//any -> bool
+operator: expressionleft SAME_OP expression
   | expressionleft DIFF_OP expression
+//bool -> bool
   | expressionleft AND_OP expression
   | expressionleft OR_OP expression
   | NOT_OP expression
+//int -> bool
   | expressionleft LT_OP expression
   | expressionleft LE_OP expression
   | expressionleft GT_OP expression
   | expressionleft GE_OP expression
-  | expressionleft operator expression
+//int -> int
+  | expressionleft PLUS_OP expression
+  | expressionleft MINUS_OP expression
+  | expressionleft TIMES_OP expression
+  | expressionleft DIVIDE_OP expression
   | NEG_OP expression
+// string/list -> string/list
   | expressionleft CONC_OP expression
-  | expressionleft ("[" expression "]" | range)
   | SIZE_OP expression
-  | "(" expression ")"
 
-type: BOOL_TYPE
-	| INT_TYPE 
-	| STR_TYPE
-	| LIST_TYPE
+?type: BOOL_TYPE
+     | INT_TYPE 
+     | STR_TYPE
+     | LIST_TYPE
 
-declaration: VARIABLE (EQUAL_SIGN expression)?
+declaration: type VARIABLE (EQUAL_SIGN expression)?
 
 assignation: VARIABLE EQUAL_SIGN expression
 
-loop: "tant" "que" expression "faire" "{" (instruction)* "}"
-    | "pour" "chaque" type VARIABLE "dans" expression "faire" "{" (instruction)* "}"
+loop: /tant que/ expression "faire" "{" (instruction)* "}"
+    | /pour chaque/ type VARIABLE "dans" expression "faire" "{" (instruction)* "}"
 
-literal: ENTIER
+?literal: ENTIER -> entier
 	   | booleen 
-	   | ESCAPED_STRING
+	   | ESCAPED_STRING -> string
 
-list: "[" expression? ("," expression)* "]"
+list: "[" expression? ("," expression)* "]" 
 
 range: "[" expression? ":" expression? "]"
 
 controls: test
 		| loop
 
-test: "si" expression "alors" "{" instruction* "}"
-    | "si" expression "alors" "{" instruction* "}" "sinon" "{" instruction* "}"
-
-
-operator: PLUS_OP
-		| MINUS_OP
-		| TIMES_OP
-		| DIVIDE_OP // TODO: not complete
+test: "si" expression "alors" "{" instruction* "}" ("sinon" "{" instruction* "}")?
 
 TERMINAL: ";"
 
@@ -71,8 +71,8 @@ EQUAL_SIGN: "="
 
 ENTIER: /0|[1-9][0-9]*/
 
-booleen: TRUE_KW 
-	   | FALSE_KW
+?booleen: TRUE_KW  -> true
+	   | FALSE_KW -> false
 
 BOOL_TYPE: "booléen"
 INT_TYPE: "entier"
@@ -80,7 +80,7 @@ STR_TYPE: "texte"
 LIST_TYPE: "liste"
 
 SAME_OP: "==" | "vaut"
-DIFF_OP: "!=" | "ne" "vaut" "pas"
+DIFF_OP: "!=" | /ne vaut pas/ 
 
 AND_OP: "et"
 OR_OP: "ou"

spf.py

@@ -6,9 +6,68 @@
 import argparse
 import lark
 import sys
+from enum import Enum
+
+variables = {}
+
+class VariableType(Enum):
+    boolean     = 1
+    integer     = 2
+    string      = 3
+    list        = 4
+
+
+class Variable():
+    def __init__(self, type, value):
+        self.type = type
+        self.value = value
+
+    def __str__(self):
+        if self.type == "booléen":
+            return "Vrai" if self.value else "Faux"
+        return f"{self.value}"
+
+    def __repr__(self):
+        if self.type == "texte":
+            return f"\"{self.value}\""
+        return f"{self.value}"
+
+class SPFInterpreter(lark.visitors.Interpreter):
+    def afficher(self, el):
+        for toprint in el.children[1:]:
+            print(self.visit_children(toprint)[0])
+        return
+
+    def declaration(self, el):
+        type = el.children[0].value
+        name = el.children[1].value
+        assert el.children[2].value == "=", "Unexpected"
+        assert el.children[3].data == "expression", "Unexpected"
+        value = self.visit_children(el.children[3])[0]
+        variables[name] = Variable(type, value)
+
+    def assignation(self, el):
+        name = el.children[0].value
+        assert name in variables, f"Unknown variable : {el.children[0].value} not in {variables}"
+        assert el.children[1].value == "=", "Unexpected"
+        assert el.children[2].data == "expression", "Unexpected"
+        value = self.visit_children(el.children[2])[0]
+        variables[name] = value #TODO: vérifier type
+
+    def expressionleft(self, el):
+        return self.visit_children(el)[0]
+
+
+    def variable(self, el):
+        assert el.children[0].value in variables, f"Unknown variable : {el.children[0].value} not in {variables}"
+        return variables[el.children[0].value]
+
+    # Literals
+    string = lambda self, el: el.children[0][1:-1]
+    entier = lambda self, el: int(el.children[0])
+    true = lambda self, _: True
+    false = lambda self, _: False
 
-class SPFTransformer(lark.Transformer):
-    pass
 
 
 def main():
@@ -22,9 +81,6 @@ def main():
                         action="store_true")
     args = arg_parser.parse_args()
 
-    if args.dump:
-        print("Dump activated (TODO)", file=sys.stderr)
-
     if args.trace:
         print("Trace activated (TODO)", file=sys.stderr)
 
@@ -35,7 +91,11 @@ def main():
         program = spf_input.read()
         parsed = spf_parser.parse(program)
 
-    print(parsed.pretty())
+    interpreter = SPFInterpreter()
+    interpreted = interpreter.visit(parsed)
+
+    if args.dump:
+        print(variables, file=sys.stderr)
 
 
 if __name__ == "__main__":