prettier-plugin-erb/lib/expression_type_matcher.js

Prettier plugin for .html.erb files

const expressionTypeMatcher = (expression) => {
  let type;

  if (/<%-?\s*(if|unless)\s[\s\S]*?end\s*-?%>/.test(expression)) {
    type = 'plain';
  } else if (/<%-?\s*(if|unless|case)\s/.test(expression) || /<%[^#][\S\s]*(\sdo|\|)\s*-?%>/.test(expression)) {
    type = 'start';
  } else if (/<%-?\s*end\s*-?%>/.test(expression)) {
    type = 'end';
  } else if (/<%-?\s*else\s*-?%>/.test(expression) || /<%-?\s*(elsif|when)\s/.test(expression)) {
    type = 'middle';
  } else {
    type = 'plain';
  }

  return { type };
};

module.exports = expressionTypeMatcher;