Jison

Jison is a parser generator written in JavaScript. This page uses Jison to display an interactive parsing table based on the grammar and parsing algorithm chosen, which can be very helpful for debugging.

Special thanks to Dr. Ligatti for suggesting and giving feedback on the initial interface.

Input

Input a BNF grammar as you would with Bison.

Load an example: Basic Basic (with lexer) Basic (with error rule) Basic #2 Basic #2 (with lexer) ANSI C btyacc-ansiC btyacc-ansiC2 btyacc-ftp btyacc-t1 btyacc-t2 calculator (with option lookahead_on_demand) calculator classy classy_ast comments DISM DISM in LR(0) dot error-handling-and-yyclearin error-handling-and-yyerrok-loopfix error-handling-and-yyerrok-looping1 error-handling-and-yyerrok-looping2 error-handling-and-yyerrok-macro error-handling-and-yyerrok-part1 error-handling-and-yyerrok-part2 error-handling-and-yyerrok-part3 error-handling-and-yyerrok-part4a error-handling-and-yyerrok-part4b error-handling-and-yyerrok-part5 error-only error-recognition-actions faking-multiple-start-rules-alt faking-multiple-start-rules flow formula fsyacc-cgrammar gantt grammar happyhappy inherited (yacc) issue-254 issue-293 jscore (JavaScript core grammar) lambdacalc lojban-300 mermaid mfcalc nv_classy_ast olmenu-proto2 phraser Precedence operators Reduce-Reduce conflict regex tikiwikiparser unicode unicode2 with-includes with_custom_lexer yacc-error-recovery

%% E : E PLUS T | T ; T : ZERO ;

Parser type: LR(0) SLR(1) LALR(1) LR(1) LL(1) * WARNING: LR(1) may take considerable time to execute for large/ambigous grammars.

Process Grammar

Output