How to use the blockly.BlockSvg function in blockly

/**
 * @fileoverview Shim on Blockly to permit statement connections on the same line with value connections
 * @author miguel.ceriani@gmail.com (Miguel Ceriani)
 */
'use strict';

var Blockly = require('blockly');

/**
 * Computes the height and widths for each row and field.
 * @param {number} iconWidth Offset of first row due to icons.
 * @return {!Array.>} 2D array of objects, each containing
 *     position information.
 * @private
 */
Blockly.BlockSvg.prototype.renderCompute_ = function(iconWidth) {
  var inputList = this.inputList;
  var inputRows = [];
  inputRows.rightEdge = iconWidth + Blockly.BlockSvg.SEP_SPACE_X * 2;
  if (this.previousConnection || this.nextConnection) {
    inputRows.rightEdge = Math.max(inputRows.rightEdge,
        Blockly.BlockSvg.NOTCH_WIDTH + Blockly.BlockSvg.SEP_SPACE_X);
  }
  inputRows.statementEdge = 0;
  var fieldValueWidth = 0;  // Width of longest external value field.
  var fieldStatementWidth = 0;  // Width of longest statement field.
  var hasValue = false;
  var hasStatement = false;
  var hasDummy = false;
  var lastType = undefined;
  var isInline = this.getInputsInline() && !this.isCollapsed();
  for (var i = 0, input; input = inputList[i]; i++) {

FieldTable.prototype.positionBlock_ = function(block, x, y) {
  if (block) {
    block.moveBy(Blockly.BlockSvg.TAB_HEIGHT + x, y);
  }
};

var fieldY = cursorY;
      if (input.align != Blockly.ALIGN_LEFT) {
        var fieldRightX = inputRows.statementEdge - input.fieldWidth -
            2 * Blockly.BlockSvg.SEP_SPACE_X;
        if (input.align == Blockly.ALIGN_RIGHT) {
          fieldX += fieldRightX;
        } else if (input.align == Blockly.ALIGN_CENTRE) {
          fieldX += fieldRightX / 2;
        }
      }
      this.renderFields_(input.fieldRow, fieldX, fieldY);
      cursorX = inputRows.statementEdge + Blockly.BlockSvg.NOTCH_WIDTH;
      steps.push('H', cursorX);
      steps.push(Blockly.BlockSvg.INNER_TOP_LEFT_CORNER);
      steps.push('v', row.height - 2 * Blockly.BlockSvg.CORNER_RADIUS);
      steps.push(Blockly.BlockSvg.INNER_BOTTOM_LEFT_CORNER);
      steps.push('H', inputRows.rightEdge);
      if (this.RTL) {
        highlightSteps.push('M',
            (cursorX - Blockly.BlockSvg.NOTCH_WIDTH +
             Blockly.BlockSvg.DISTANCE_45_OUTSIDE) +
            ',' + (cursorY + Blockly.BlockSvg.DISTANCE_45_OUTSIDE));
        highlightSteps.push(
            Blockly.BlockSvg.INNER_TOP_LEFT_CORNER_HIGHLIGHT_RTL);
        highlightSteps.push('v',
            row.height - 2 * Blockly.BlockSvg.CORNER_RADIUS);
        highlightSteps.push(
            Blockly.BlockSvg.INNER_BOTTOM_LEFT_CORNER_HIGHLIGHT_RTL);
        highlightSteps.push('H', inputRows.rightEdge - 0.5);
      } else {
        highlightSteps.push('M',
            (cursorX - Blockly.BlockSvg.NOTCH_WIDTH +