@sap/dwf-generator/generator/generate/common.js

SAP HANA Data Warehousing Foundation - Generator

'use strict';

const ciJsonSpaces = 2;
const csSynonymNameSuffix = '_SYNONYM';

const coFs = require('fs');
const coHandlebars = require('handlebars');
const coPath = require('path');
const coTemplatePaths = require('../templates/whiteList');
var _templates = {};

coHandlebars.registerHelper('objectFullName', function (isNamespace, isObjectName) {
  if (!isNamespace)
    return 'isObjectName';
  if (isObjectName.match('::'))
    return 'isObjectName';
  return `${isNamespace}::${isObjectName}`;
});

coHandlebars.registerHelper('stringify', function (ioObj) {
  return JSON.stringify(ioObj, null, ciJsonSpaces);
});

coHandlebars.registerHelper('addComma', function (ibLast) {
  if (!ibLast) {
    return ',';
  }
});

coHandlebars.registerHelper('inc', function (iiValue) {
  return parseInt(iiValue) + 1;
});

coHandlebars.registerHelper('add', function (iiValueA, iiValueB) {
  return parseInt(iiValueA) + parseInt(iiValueB);
});

coHandlebars.registerHelper('addAnd', function (ibLast) {
  if (!ibLast) {
    return ' AND ';
  }
});

function lfnReplace(isTemplate, ioData, ibJson) {
  _loadTemplate(isTemplate);
  let lsSource = _templates[isTemplate];
  let lfnTemplate = coHandlebars.compile(lsSource);
  let lsResult = lfnTemplate(ioData);
  if (ibJson) {
    lsResult = JSON.stringify(JSON.parse(lsResult), null, ciJsonSpaces);
  }
  return lsResult;
}

function _loadTemplate(isTemplate) {
  if (!_templates[isTemplate]) {
    let lsPath = coPath.resolve(__dirname, '..', 'templates', coTemplatePaths[isTemplate]);
    if (!lsPath) {
      throw new Error('template enigine: invalid template');
    }
    try {
      _templates[isTemplate] = coFs.readFileSync(lsPath, 'utf8');
    } catch (e) {
      console.log(e);
      throw new Error(`template enigine: Fail by loading template from directory: ${lsPath}`);
    }
  }
}

module.exports = {
  jsonSpaces: ciJsonSpaces,
  replace: lfnReplace,
  synonymNameSuffix: csSynonymNameSuffix
};