Quelle expressions.js Sprache: JAVA

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */

import { correctIndentation } from "./indentation";
import { getGrip, getFront } from "./evaluation-result";

const UNAVAILABLE_GRIP = { unavailable: true };

/*
* wrap the expression input in a try/catch so that it can be safely
* evaluated.
*
* NOTE: we add line after the expression to protect against comments.
*/
export function wrapExpression(input) {
  return correctIndentation(`
    try {
      ${input}
    } catch (e) {
      e
    }
  `);
}

function isUnavailable(value) {
  return (
    value &&
    !!value.isError &&
    (value.class === "ReferenceError" || value.class === "TypeError")
  );
}

/**
*
* @param {Object} expression: Expression item as stored in state.expressions in reducers/expressions.js
* @param {String} expression.input: evaluated expression string
* @param {Object} expression.value: evaluated expression result object as returned from ScriptCommand#execute
* @param {Object} expression.value.result: expression result, might be a primitive, a grip or a front
* @param {Object} expression.value.exception: expression result error, might be a primitive, a grip or a front
* @returns {Object} an object of the following shape:
*                   - expressionResultGrip: A primitive or a grip
*                   - expressionResultFront: An object front if it exists, or undefined
*/
export function getExpressionResultGripAndFront(expression) {
  const { value } = expression;

  if (!value) {
    return { expressionResultGrip: UNAVAILABLE_GRIP };
  }

  const expressionResultReturn = value.exception || value.result;
  const valueGrip = getGrip(expressionResultReturn);
  if (!valueGrip || isUnavailable(valueGrip)) {
    return { expressionResultGrip: UNAVAILABLE_GRIP };
  }

  if (valueGrip.isError) {
    const { name, message } = valueGrip.preview;
    return { expressionResultGrip: `${name}: ${message}` };
  }

  return {
    expressionResultGrip: valueGrip,
    expressionResultFront: getFront(expressionResultReturn),
  };
}

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