Add Jison (#3488)

samples/Jison Lex/classy.jisonlex

@@ -0,0 +1,39 @@
+digit                       [0-9]
+id                          [a-zA-Z][a-zA-Z0-9]*
+
+%%
+"//".*                      /* ignore comment */
+"main"                      return 'MAIN';
+"class"                     return 'CLASS';
+"extends"                   return 'EXTENDS';
+"nat"                       return 'NATTYPE';
+"if"                        return 'IF';
+"else"                      return 'ELSE';
+"for"                       return 'FOR';
+"printNat"                  return 'PRINTNAT';
+"readNat"                   return 'READNAT';
+"this"                      return 'THIS';
+"new"                       return 'NEW';
+"var"                       return 'VAR';
+"null"                      return 'NUL';
+{digit}+                    return 'NATLITERAL';
+{id}                        return 'ID';
+"=="                        return 'EQUALITY';
+"="                         return 'ASSIGN';
+"+"                         return 'PLUS';
+"-"                         return 'MINUS';
+"*"                         return 'TIMES';
+">"                         return 'GREATER';
+"||"                        return 'OR';
+"!"                         return 'NOT';
+"."                         return 'DOT';
+"{"                         return 'LBRACE';
+"}"                         return 'RBRACE';
+"("                         return 'LPAREN';
+")"                         return 'RPAREN';
+";"                         return 'SEMICOLON';
+\s+                         /* skip whitespace */
+"."                         throw 'Illegal character';
+<<EOF>>                     return 'ENDOFFILE';
+
+

samples/Jison Lex/lex_grammar.jisonlex

@@ -0,0 +1,29 @@
+
+%%
+\n+                         {yy.freshLine = true;}
+\s+                         {yy.freshLine = false;}
+"y{"[^}]*"}"                {yytext = yytext.substr(2, yyleng - 3); return 'ACTION';}
+[a-zA-Z_][a-zA-Z0-9_-]*     {return 'NAME';}
+'"'([^"]|'\"')*'"'          {return 'STRING_LIT';}
+"'"([^']|"\'")*"'"          {return 'STRING_LIT';}
+"|"                         {return '|';}
+"["("\]"|[^\]])*"]"         {return 'ANY_GROUP_REGEX';}
+"("                         {return '(';}
+")"                         {return ')';}
+"+"                         {return '+';}
+"*"                         {return '*';}
+"?"                         {return '?';}
+"^"                         {return '^';}
+"/"                         {return '/';}
+"\\"[a-zA-Z0]               {return 'ESCAPE_CHAR';}
+"$"                         {return '$';}
+"<<EOF>>"                   {return '$';}
+"."                         {return '.';}
+"%%"                        {return '%%';}
+"{"\d+(","\s?\d+|",")?"}"   {return 'RANGE_REGEX';}
+/"{"                        %{if (yy.freshLine) { this.input('{'); return '{'; } else { this.unput('y'); }%}
+"}"                         %{return '}';%}
+"%{"(.|\n)*?"}%"            {yytext = yytext.substr(2, yyleng - 4); return 'ACTION';}
+.                           {/* ignore bad characters */}
+<<EOF>>                     {return 'EOF';}
+