Design a Code Editor using SAP UI5

Introduction

In this tutorial, we will learn how to design a simple code editor using SAP UI5. These code editors can be used to run, pretty printer and test codes. SAP UI5 provides different types of code editors like javascript, ABAP, etc.

In the world of software development, a well-designed code editor is an essential tool for programmers to write, edit, and debug their code efficiently. SAP UI5, a robust framework developed by SAP, provides a powerful and flexible solution for creating code editors with its sap.ui.codeeditor library.

Designing a code editor using SAP UI5’s sap.ui.codeeditor involves leveraging the extensive capabilities of this library to create a user-friendly interface and enhance the overall coding experience. This powerful UI5 library offers a variety of features and functionalities, including syntax highlighting, code completion, line numbering, and more, enabling developers to streamline their coding tasks.

In this project, we will explore the process of designing a code editor using SAP UI5’s sap.ui.codeeditor. We will delve into the key components and concepts of the sap.ui.codeeditor library and learn how to integrate them seamlessly into a user interface. By the end of this project, you will have a solid understanding of how to leverage SAP UI5 to build a code editor that caters to the needs of developers and empowers them to write clean, efficient, and error-free code.

So, let’s embark on this journey of designing a code editor using SAP UI5’s sap.ui.codeeditor and unlock the potential to create a top-notch coding environment for programmers.

Types of Code Editors in SAP UI5

In SAP UI5, you have two types of code editors:

1. Default Autocompletion:

The Default Autocompletion feature in SAP UI5 code editors saves developers time by reducing the need to manually type long names or search for the correct syntax. It enhances productivity and accuracy by offering intelligent suggestions, thus minimizing the chance of typographical errors or misspelled identifiers. By providing real-time assistance, this autocompletion feature enables developers to write code more efficiently and maintain a consistent coding style.

The Default Autocompletion feature in SAP UI5 code editors provides built-in support for suggesting code completions as you type. This feature leverages the code editor’s understanding of the programming language’s syntax and context to offer relevant suggestions. When enabled, the code editor analyzes the code you’re writing and provides a list of available completions for functions, variables, classes, methods, and more.

2. Custom Autocompletion:

In addition to the Default Autocompletion feature, SAP UI5 code editors also allow developers to define their own custom autocompletion rules. This enables them to extend the autocompletion functionality and tailor it to their specific requirements or domain-specific languages.

With Custom Autocompletion, developers can define their own sets of suggestions for commonly used code snippets, libraries, frameworks, or any other custom context-specific completions. These custom autocompletion rules can be defined based on predefined trigger characters or specific events, such as pressing a hotkey or invoking a code generation action.

Custom Autocompletion empowers developers to create personalized coding experiences and streamline repetitive tasks. It allows for the integration of project-specific or industry-specific code snippets, abbreviations, or templates, making it easier to write code and adhere to coding standards or best practices.

By leveraging both the Default Autocompletion and Custom Autocompletion features in SAP UI5 code editors, developers can benefit from intelligent suggestions, improved coding speed, reduced errors, and a more tailored coding experience, ultimately enhancing their productivity and efficiency in software development.

How to Design a Code Editor using SAP UI5

Designing a code editor using SAP UI5 involves creating a user-friendly interface and integrating the sap.ui.codeeditor library to provide essential code editing functionalities. Here is a step-by-step guide to designing a code editor using SAP UI5:

1. Set up the SAP UI5 Development Environment:
– Install SAPUI5 library and necessary development tools.
– Create a new SAP UI5 project or use an existing project as a base.

2. Define the UI Layout:
– Create a view or a page to hold the code editor component.
– Design the overall layout using SAP UI5 controls like panels, containers, or grids.
– Set up the necessary structure for the code editor and other supporting components.

3. Integrate the Code Editor Component:
– Include the sap.ui.codeeditor library in your project dependencies.
– Instantiate the sap.ui.codeeditor.CodeEditor control in your view or page.
– Configure the code editor with desired properties like height, width, syntax highlighting, and initial code content.

4. Implement Code Editor Functionalities:
– Enable basic code editing functionalities such as text selection, cursor navigation, and text manipulation (insertion, deletion).
– Implement syntax highlighting by defining syntax rules for different programming languages.
– Enable code formatting options to automatically format the code based on predefined rules.
– Implement code validation and error highlighting by integrating with relevant parsers or linters.
– Implement code completion feature to provide intelligent suggestions for code elements.
– Add support for keyboard shortcuts and hotkeys to enhance the coding experience.

5. Enhance the User Experience:
– Implement line numbering and gutter indicators to improve code readability.
– Add search and replace functionality to enable text search and replace operations within the code.
– Integrate version control system functionalities like Git integration for code versioning and history tracking.
– Provide options to customize the editor’s theme or visual appearance.
– Implement code folding feature to allow collapsing and expanding sections of code for better organization.

6. Handle User Interactions:
– Implement event handlers to capture user interactions such as code changes, cursor movements, or code selection.
– Define appropriate callbacks or event listeners to respond to user actions and trigger corresponding actions or updates.

7. Test and Refine:
– Test the code editor with sample code snippets to ensure proper functionality and responsiveness.
– Gather feedback from users and iterate on the design based on their requirements and suggestions.
– Continuously refine and optimize the code editor’s performance and user experience.

By following these steps, you can design a code editor using SAP UI5 that provides a feature-rich and intuitive coding environment for developers. Remember to leverage the capabilities of the sap.ui.codeeditor library and tailor the editor’s functionalities to suit your specific development needs.

View Code

<mvc:View controllerName="Test.Test.controller.Main" xmlns:mvc="sap.ui.core.mvc" xmlns="sap.m" xmlns:l="sap.ui.layout"
    xmlns:CodeEditor="sap.ui.codeeditor" height="100%" displayBlock="true">
    <Page title="My Project Ideas: Code Editor">
        <content></content>
    </Page>
    <IconTabHeader id="iconTabHeader" selectedKey="invalidKey" select=".onSelectTab">
        <items>
            <IconTabFilter text="Default Autocompletion" key="A"/>
            <IconTabFilter text="Custom Autocompletion" key="B"/>
        </items>
    </IconTabHeader>
    <CodeEditor:CodeEditor id="aCodeEditor" height="300px" type="javascript"/>
    <Button text="Pretty Printer" press="onPrettyCode"/>
    <Button text="Run JavaScript Code" press="onRunCode"/>
</mvc:View>

 

Controller Code

sap.ui.define([
    "sap/ui/core/mvc/Controller",
    "sap/m/MessageBox",
    "sap/m/MessageToast",
    "sap/ui/model/json/JSONModel",
    "sap/ui/Device",
    "sap/ui/codeeditor/CodeEditor",
], function (Controller, MessageBox, MessageToast, JSONModel, Device, CodeEditor) {
    "use strict";
    var oEditor;
    var example1 = "function loadDoc() {\n\treturn 'Default Autocompletion: Write JavaScript Here';\n}";
    var example2 = "function myFunction(p1, p2) {\n\treturn 'Custom Autocompletion: Write ABAP Here';\n}";

    return Controller.extend("Test.Test.controller.Main", {
        onInit: function () {
            oEditor = this.byId("aCodeEditor");
            oEditor.setValue("// select tabs to see value of CodeEditor changing");
        },

        onSelectTab: function (oEvent) {
            var sFilterId = oEvent.getParameter("selectedKey");
            switch (sFilterId) {
            case "A":
                oEditor.setValue(example1);
                oEditor.setType("javascript");
                break;
            case "B":
                oEditor.setValue(example2);
                oEditor.setType("abap");
                oEditor.addCustomCompleter({
                    getCompletions: function (callback, context) {
                        // callback is provided to us by ACE so we can execute it as shown
                        // below to display suggestions to the user
                        // ideally, the array argument, provided to the following method call
                        // will be dynamically generated based on the content of the context object
                        // let's assume the context contains an sPrefix equal to 'read', which
                        // means the cursor in ACE is at the end of a 'read' word
                        // by executing the following call, we can show a list of suggestions
                        // such as: readFile, readStream, readResponse
                        callback(null, [{
                            value: "readFile()",
                            score: 100,
                            meta: "rhyme"
                        }, {
                            value: "readStream(input)",
                            score: 1,
                            meta: "params: input"
                        }, {
                            value: "readNow",
                            score: 1,
                            meta: "params: input"
                        }, {
                            value: "readStream(input, encoding)",
                            score: 1,
                            meta: "params: input, encoding"
                        }, {
                            value: "rudra(input, encoding)",
                            score: 1,
                            meta: "params: input, encoding"
                        }, {
                            value: "My Project Ideas(input, encoding)",
                            score: 1,
                            meta: "params: input, encoding"
                        }]);
                    }

                });
                break;
            default:
                oEditor.setValue();
                break;
            }
        },

        onPrettyCode: function () {
            oEditor.prettyPrint();
        },

        onRunCode: function () {
            var code = oEditor.getValue();
            try {
                // Use eval to execute the code
                eval(code);
            } catch (error) {
                // Display any error that occurred during execution
                alert("Code Running Failed");
            }
        }
    });
});

 

Output

Output of Code Editor
Output of Code Editor

 

Custom Autocompletion in Code Editor
Custom Autocompletion in Code Editor

Author

  • Barry Allen

    A Full Stack Developer with 10+ years of experience in different domain including SAP, Blockchain, AI and Web Development.

    View all posts

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