specplate.jison

%%

spec
    : prefix top_description_list EOF
    ;

prefix
    : PREFIX
      {print('prefix',yytext);}
    |
    ;

top_description_list
    : top_description_list description
    | description
    ;

description
    : DESCRIBE string before_block description_list END
    ;

description_list
    : description_list list_item
    | list_item
    ;

before_block
    : BEFORE_BLOCK
      {print('before',yytext);}
    |
    ;

list_item
    : description
    | it_block
    ;

it_block
    : it code
    ;

it
    : IT
      {print('it',yytext);}
    ;

string
    : STRING
      {print('string',yytext.substr(1, yytext.length-2));}
    ;

code
    : CODE
      {print('code',yytext);}
    ;

specplate.lex.json

{
  "rules": [
    ["[^\\v]+?describe\\b", "this.unput('describe');return 'PREFIX';"],
    ["\\s+", ""],
    ["describe\\b", "return 'DESCRIBE';"],
    ["before_each\\b[^\\v]*?end", "return 'BEFORE_BLOCK';"],
    ["it\\s*'[^']*'", "this.unput('then'); return 'IT';"],
    ["'[^']*'", "return 'STRING';"],
    ["then\\b[^\\v]*?end", "return 'CODE';"],
    ["end\\b", "return 'END';"],
    ["$", "return 'EOF';"]
  ]
}