cypher-tag/src/index.js

A template literal tag for Cypher in GraphQL.

import stripIndent from "strip-indent";

const cql = (statement, ...substitutions) => {
  const BLOCK_QUOTE = `"""`;
  // Get the array of string literals
  const literals = statement.raw;
  // Add each substitution inbetween all
  const composed = substitutions.reduce((composed, substitution, index) => {
    // Format and add the string literal
    composed.push(stripIndent(literals[index]));
    if (substitution) {
      const trimmed = substitution.trim();
      if (trimmed.startsWith(BLOCK_QUOTE) && trimmed.endsWith(BLOCK_QUOTE)) {
        // Removes GraphQL block quotes from nested compilation
        substitution = substitution.substr(3).slice(0, -3);
      }
      // Format and add this substitution
      composed.push(`\n${stripIndent(substitution)}`);
    }
    return composed;
  }, []);
  // Format and add the last literal
  composed.push(`\n${stripIndent(literals[literals.length - 1])}`);
  return `${BLOCK_QUOTE}${composed.join("").trim()}${BLOCK_QUOTE}`;
};

export default cql;