bpmn-elements/dist/Expressions.js

Executable workflow elements based on BPMN 2.0

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = Expressions;
var _getPropertyValue = _interopRequireDefault(require("./getPropertyValue.js"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
const isExpressionPattern = /^\${(.+?)}$/;
const expressionPattern = /\${(.+?)}/;
function Expressions() {
  return {
    resolveExpression,
    isExpression,
    hasExpression
  };
}
function resolveExpression(templatedString, context, expressionFnContext) {
  let result = templatedString;
  while (expressionPattern.test(result)) {
    const expressionMatch = result.match(expressionPattern);
    const innerProperty = expressionMatch[1];
    if (innerProperty === 'true') {
      return true;
    } else if (innerProperty === 'false') {
      return false;
    } else if (innerProperty === 'null') {
      return null;
    } else {
      const n = Number(innerProperty);
      if (!isNaN(n)) return n;
    }
    const contextValue = (0, _getPropertyValue.default)(context, innerProperty, expressionFnContext);
    if (expressionMatch.input === expressionMatch[0]) {
      return contextValue;
    }
    result = result.replace(expressionMatch[0], contextValue === undefined ? '' : contextValue);
  }
  return result;
}
function isExpression(text) {
  if (!text) return false;
  return isExpressionPattern.test(text);
}
function hasExpression(text) {
  if (!text) return false;
  return expressionPattern.test(text);
}