Parsing an example language

general.jison

/* description: Parses a simple Template spec*/

/* lexical grammar */
%lex

%%
\s+                   /* skip whitespace */
[a-zA-Z0-9_]+\b   return 'WORD';
"<"               return '<';
">"               return '>';
"["               return '[';
"]"               return ']';
<<EOF>>           return 'EOF';

/lex

%start template

%% /* */

template
    : words EOF
      {console.log($1); return $1;}
    ;

words 
    :word
        {$$=$1;}
    | word words
        {$$=$1+$2;}
    | '[' words ']'
      {$$ = $1+$2+$3;}
    ;

word
  : WORD
    {$$ = $1;}
  | '<' WORD '>'
    {console.log('special word:'+$2); $$ = $1+$2+$3}
 ;

inoke.sh

npm install -g jison # install jison if not present

# will generate generator.js in cwd, which is the parser for our language.
jison general.jison 

# generate input file
echo "I have to shop for <item>  [with <accomplishments> [which as also <discounted>]]" > general 

# parse the example using our generated sheeny parser
node general.js general

#profit