javascript - Jison: Getting parsed token instead of what is defined in Grammar -

i attempting generate parser related recipe ingredients. noticing order parser handles tokens seems follow token's line-item order in jison file, vs. whats defined in ebnf grammar.

for example, parsing 6 tablespoons unsalted butter, cut 1-inch pieces yields:

error: parse error on line 1: 6 tablespoons unsalted --^ expecting 'unit_name', 'number', 'slash', got 'word' 

i expect grammar see unit_name tablespoons before eats word. right grammar approach here? have been using interactive jison parser validate grammar states , didnt see gotchas far.

jison grammer

%lex %options flex case-insensitive  unitname                    [teaspoons|teaspoon|tablespoons|tablespoon|fluid ounces|fluid ounce|ounces|ounce|cups|cup|pints|pint|quarts|quart|gallons|gallon|pounds|pound|milliliters|milliliter|deciliters|deciliter|liters|liter]\b word                        \w+\b number                      [1-9][0-9]+|[0-9] char                        [a-za-z0-9_-]  %%  \s+                      /* skip whitespace */ {number}                 return 'number' {unitname}               return "unit_name"; {word}                   return 'word' {char}                   return 'char' "/"                      return "slash"; "-"                      return "hyphen" ","                      return "comma"; <<eof>>                  return 'eof';  /lex  /* enable ebnf grammar syntax */ %ebnf  /* language grammar */ %start ingredient %%  ingredient     : ingredient_format         { return $1; }     ;  ingredient_format     : unit_count unit_name ingredient_name comma ingredient_info eof         { $$ = {'count': $1, 'unit': $2, 'item': $3, info: $5}; }     | unit_count unit_name ingredient_name eof         { $$ = {'count': $1, 'unit': $2, 'item': $3, info: null}; }     ;  unit_count     : number         { $$ = parseint($1); }     | number slash number         { $$ = parseint($1) / parseint($3); }     | number number slash number         { $$ = parseint($1) + (parseint($2) / parseint($4)); }     ;  ingredient_name     : word+         { $$ = $1; }     ;  ingredient_info     : ""         { $$ = ''; }     | word+         { $$ = $1; }     ; 

gist

i created text strings , simple parser test: https://gist.github.com/aphexddb/ddc83d57c7f1c1b96458