ecmarkup/lib/RHS.js

Custom element definitions and core utilities for markup that specifies ECMAScript and related technologies.

'use strict';

module.exports = RHS;

function RHS(spec, prod, node) {
  this.spec = spec;
  this.production = prod;
  this.node = node;
  this.constraints = node.getAttribute('constraints');
  this.alternativeId = node.getAttribute('a');
}

RHS.prototype.build = function () {
  if (this.node.textContent === '') {
    this.node.textContent = '[empty]';

    return;
  }

  if (this.constraints) {
    const cs = this.spec.doc.createElement('emu-constraints');
    cs.textContent = '[' + this.constraints + ']';

    this.node.insertBefore(cs, this.node.childNodes[0]);
  }

  this.terminalify(this.node);
};

RHS.prototype.terminalify = function (parentNode) {
  for (let i = 0; i < parentNode.childNodes.length; i++) {
    const node = parentNode.childNodes[i];

    if (node.nodeType === 3) {
      const text = node.textContent.trim();
      const pieces = text.split(/\s/);

      pieces.forEach(function (p) {
        if (p.length === 0) {
          return;
        }
        const est = this.spec.doc.createElement('emu-t');
        est.textContent = p;

        parentNode.insertBefore(est, node);
      }, this);

      parentNode.removeChild(node);
    }
  }
};