Merge pull request #192 from adharshkamath/invariants-grammar

Updated the grammar for invariants

Author: shubhamugare

syncode/parsers/grammars/invariants.lark

@@ -1,8 +1,8 @@
-start: invariants
+start: "```" "\n" invariants "```"
 
-invariants: (invariant /\n+/)+ -> multiple_invariants
+invariants: invariant+ 
 
-invariant: "loop" /\s+/ "invariant" /\s+/ pred ";" -> invariant
+invariant: "loop" "invariant" pred ";" "\n"
 
 STRING: /"([^"\\]|\\.)*"/
 
@@ -12,15 +12,15 @@ REAL: /[0-9]+\.[0-9]+/
 
 CHAR: /'([^'\\]|\\.)'/
 
-TRUE: "\true"
+TRUE: "\\true"
 
-FALSE: "\false"
+FALSE: "\\false"
 
-IDENTIFIER: /[a-zA-Z_][a-zA-Z0-9_]*/
+IDENTIFIER.-1: /[a-zA-Z_][a-zA-Z0-9_]*/
 
 unary_logic_op: "~" 
 
-bin_logic_op: "&&" | "||" | "=>" | "<=>" 
+bin_logic_op: "&&" | "||" | "==>" | "<==>" 
 
 rel_arith_op: "==" | "!=" | "<" | "<=" | ">" | ">="
 
@@ -33,16 +33,18 @@ expr: INTEGER
     | CHAR 
     | STRING 
     | IDENTIFIER 
-    | IDENTIFIER /\s+/ "(" /\s+/ expr /\s+/ ("," /\s+/ expr)* /\s+/ ")"
-    | "(" /\s+/ expr /\s+/ ")" 
-    | unary_arith_op /\s+/ expr 
-    | expr /\s+/ bin_arith_op /\s+/ expr 
-    | expr /\s+/ "?" /\s+/ expr /\s+/ ":" /\s+/ expr
+    | IDENTIFIER  "("  expr  (","  expr)*  ")"
+    | "("  expr  ")" 
+    | unary_arith_op  expr 
+    | expr  bin_arith_op  expr 
+    | expr  "?"  expr  ":"  expr
 
 pred: TRUE 
     | FALSE 
-    | "(" /\s+/ pred /\s+/ ")"
+    | "("  pred  ")"
     | expr
-    | unary_logic_op /\s+/ pred 
-    | pred /\s+/ bin_logic_op /\s+/ pred 
-    | expr /\s+/ rel_arith_op /\s+/ expr
+    | unary_logic_op  pred 
+    | pred  bin_logic_op  pred 
+    | expr  rel_arith_op  expr
+
+%ignore /[\t ]/