Function renderAst

renderAst(ast: SearchAst): string

Renders a parsed search AST as a readable one-line expression, so a printed probe shows how the query was actually parsed rather than just echoing the raw input.

Parameters

ast: SearchAst
The node to render.

Returns string

A parenthesized boolean expression.

Example

renderAst({ type: "and",
  left: { type: "term", value: "sodium", phrase: false },
  right: { type: "not", operand: { type: "term", value: "borohydride", phrase: false } } });
// => '(sodium AND NOT borohydride)'

Source

export function renderAst(ast: SearchAst): string {
  switch (ast.type) {
    case 'term':
      return ast.phrase ? `"${ast.value}"` : ast.value;
    case 'and':
      return `(${renderAst(ast.left)} AND ${renderAst(ast.right)})`;
    case 'or':
      return `(${renderAst(ast.left)} OR ${renderAst(ast.right)})`;
    case 'not':
      return `NOT ${renderAst(ast.operand)}`;
    default:
      return '<unknown>';
  }
}