lib/lexer.js
function(type) {
    this.file.ast.blocks[type] = this.file.ast.blocks[type] || {};
    this.addLexer(this.captureOpen(type));
    this.addLexer(this.captureClose(type));
    return this;
  }
function(type) {
    this.file.ast.blocks[type] = this.file.ast.blocks[type] || {};
    this.addLexer(this.captureOpen(type));
    this.addLexer(this.captureClose(type));
    return this;
  }
Create a block lexer with opening and closing tags for the given `name`.
@param {String} `name`
@return {Function}