Add Jison (#3488)

samples/Jison/classy.jison

@@ -0,0 +1,84 @@
+
+/* description: ClassyLang grammar. Very classy. */
+/*
+  To build parser:
+
+    $ ./bin/jison examples/classy.jison examples/classy.jisonlex
+
+*/
+
+
+/* author: Zach Carter */
+
+%right ASSIGN
+%left OR
+%nonassoc EQUALITY GREATER
+%left PLUS MINUS
+%left TIMES
+%right NOT
+%left DOT
+
+%%
+
+pgm
+    : cdl MAIN LBRACE vdl el RBRACE ENDOFFILE
+    ;
+
+cdl
+    : c cdl
+    |
+    ;
+
+c
+    : CLASS id EXTENDS id LBRACE vdl mdl RBRACE
+    ;
+
+vdl
+    : VAR t id SEMICOLON vdl
+    |
+    ;
+
+mdl
+    : t id LPAREN t id RPAREN LBRACE vdl el RBRACE mdl
+    |
+    ;
+
+t
+    : NATTYPE
+    | id
+    ;
+
+id
+    : ID
+    ;
+
+el
+    : e SEMICOLON el
+    | e SEMICOLON
+    ;
+
+e
+    : NATLITERAL
+    | NUL
+    | id
+    | NEW id
+    | THIS
+    | IF LPAREN e RPAREN LBRACE el RBRACE ELSE LBRACE el RBRACE
+    | FOR LPAREN e SEMICOLON e SEMICOLON e RPAREN LBRACE el RBRACE
+    | READNAT LPAREN RPAREN
+    | PRINTNAT LPAREN e RPAREN
+    | e PLUS e
+    | e MINUS e
+    | e TIMES e
+    | e EQUALITY e
+    | e GREATER e
+    | NOT e
+    | e OR e
+    | e DOT id
+    | id ASSIGN e
+    | e DOT id ASSIGN e
+    | id LPAREN e RPAREN
+    | e DOT id LPAREN e RPAREN
+    | LPAREN e RPAREN
+    ;
+