Add Auto-Close Brackets plugin and brackets functionality for indenta…

code-input.d.ts

@@ -76,6 +76,19 @@ export namespace plugins {
     constructor();
   }
 
+  /**
+   * Automatically closes pairs of brackets/quotes/other syntaxes in code, but also lets you choose the brackets this
+   * is activated for.
+   * Files: auto-close-brackets.js
+   */
+  class AutoCloseBrackets extends Plugin {
+    /**
+     * Create an auto-close brackets plugin to pass into a template
+     * @param {Object} bracketPairs Opening brackets mapped to closing brackets, default and example {"(": ")", "[": "]", "{": "}", '"': '"'}. All brackets must only be one character.
+     */
+    constructor(bracketPairs: Object);
+  }
+
   /**
    * Display a popup under the caret using the text in the code-input element. This works well with autocomplete suggestions.
    * Files: autocomplete.js / autocomplete.css
@@ -137,8 +150,9 @@ export namespace plugins {
      * Create an indentation plugin to pass into a template
      * @param {Boolean} defaultSpaces Should the Tab key enter spaces rather than tabs? Defaults to false.
      * @param {Number} numSpaces How many spaces is each tab character worth? Defaults to 4.
+     * @param {Object} bracketPairs Opening brackets mapped to closing brackets, default and example {"(": ")", "[": "]", "{": "}"}. All brackets must only be one character, and this can be left as null to remove bracket-based indentation behaviour.
      */
-    constructor(defaultSpaces?: boolean, numSpaces?: Number);
+    constructor(defaultSpaces?: boolean, numSpaces?: Number, bracketPairs?: Object);
   }
 
   /**

plugins/README.md

@@ -7,6 +7,14 @@
 
 ---
 
+### Auto-Close Brackets
+Automatically close pairs of brackets/quotes/other syntaxes in code, but also optionally choose the brackets this
+is activated for.
+
+Files: [auto-close-brackets.js](./auto-close-brackets.js)
+
+[🚀 *CodePen Demo*](https://codepen.io/WebCoder49/pen/qBgGGKR)
+
 ### Autocomplete
 Display a popup under the caret using the text in the code-input element. This works well with autocomplete suggestions.
 
@@ -36,7 +44,7 @@ Files: [go-to-line.js](./go-to-line.js) / [go-to-line.css](./go-to-line.css)
 [🚀 *CodePen Demo*](https://codepen.io/WebCoder49/pen/YzBMOXP)
 
 ### Indent
-Adds indentation using the `Tab` key, and auto-indents after a newline, as well as making it possible to indent/unindent multiple lines using Tab/Shift+Tab. **Supports tab characters and custom numbers of spaces as indentation.**
+Add indentation using the `Tab` key, and auto-indents after a newline, as well as making it possible to indent/unindent multiple lines using Tab/Shift+Tab. **Supports tab characters and custom numbers of spaces as indentation, as well as (optionally) brackets typed affecting indentation.**
 
 Files: [indent.js](./indent.js)
 

plugins/auto-close-brackets.js

@@ -0,0 +1,54 @@
+/**
+ * Automatically close pairs of brackets/quotes/other syntaxes in code, but also optionally choose the brackets this
+ * is activated for.
+ * Files: auto-close-brackets.js
+ */
+codeInput.plugins.AutoCloseBrackets = class extends codeInput.Plugin {
+    bracketPairs = [];
+    bracketsOpenedStack = []; // Each item [closing bracket string, opening bracket location] Innermost at right so can know which brackets should be ignored when retyped
+
+    /**
+     * Create an auto-close brackets plugin to pass into a template
+     * @param {Object} bracketPairs Opening brackets mapped to closing brackets, default and example {"(": ")", "[": "]", "{": "}", '"': '"'}. All brackets must only be one character.
+     */
+    constructor(bracketPairs={"(": ")", "[": "]", "{": "}", '"': '"'}) {
+        super([]); // No observed attributes
+
+        this.bracketPairs = bracketPairs;
+    }
+
+    /* Add keystroke events */
+    afterElementsAdded(codeInput) {
+        let textarea = codeInput.textareaElement;
+        textarea.addEventListener('keydown', (event) => { this.checkBackspace(codeInput, event) });
+        textarea.addEventListener('beforeinput', (event) => { this.checkBrackets(codeInput, event); });
+
+    }
+
+    /* Event handlers */
+    checkBrackets(codeInput, event) {
+        if(this.bracketsOpenedStack.length > 0 && event.data == this.bracketsOpenedStack[this.bracketsOpenedStack.length-1][0] && event.data == codeInput.textareaElement.value[codeInput.textareaElement.selectionStart]) {
+            // "Retype" bracket, i.e. just move caret
+            codeInput.textareaElement.selectionStart = codeInput.textareaElement.selectionEnd += 1;
+            this.bracketsOpenedStack.pop();
+            event.preventDefault();
+        } else if(event.data in this.bracketPairs) {
+            // Create bracket pair
+            let closingBracket = this.bracketPairs[event.data];
+            this.bracketsOpenedStack.push([closingBracket, codeInput.textareaElement.selectionStart]);
+            document.execCommand("insertText", false, closingBracket);
+            codeInput.textareaElement.selectionStart = codeInput.textareaElement.selectionEnd -= 1;
+        }
+    }
+
+    checkBackspace(codeInput, event) {
+        if(event.key == "Backspace" && codeInput.textareaElement.selectionStart == codeInput.textareaElement.selectionEnd) {
+            if(this.bracketsOpenedStack.length > 0 && this.bracketsOpenedStack[this.bracketsOpenedStack.length-1][1]+1 == codeInput.textareaElement.selectionStart && codeInput.textareaElement.value[codeInput.textareaElement.selectionStart] == this.bracketsOpenedStack[this.bracketsOpenedStack.length-1][0]) {
+                // Delete closing bracket as well
+                codeInput.textareaElement.selectionEnd = codeInput.textareaElement.selectionStart + 1;
+                codeInput.textareaElement.selectionStart -= 1;
+                this.bracketsOpenedStack.pop();
+            }
+        }
+    }
+}

plugins/go-to-line.js

@@ -3,19 +3,23 @@
  * Files: go-to-line.js / go-to-line.css
  */
 codeInput.plugins.GoToLine = class extends codeInput.Plugin {
+    useCtrlG = false;
 
     /**
      * Create a go-to-line command plugin to pass into a template
      * @param {boolean} useCtrlG Should Ctrl+G be overriden for go-to-line functionality? If not, you can trigger it yourself using (instance of this plugin)`.showPrompt(code-input element)`.
      */
-    constructor(useCtrlG) {
+    constructor(useCtrlG = true) {
         super([]); // No observed attributes
+        this.useCtrlG = useCtrlG;
     }
 
     /* Add keystroke events */
     afterElementsAdded(codeInput) {
         const textarea = codeInput.textareaElement;
-        textarea.addEventListener('keydown', (event) => { this.checkCtrlG(codeInput, event); });
+        if(this.useCtrlG) {
+            textarea.addEventListener('keydown', (event) => { this.checkCtrlG(codeInput, event); });
+        }
     }
 
     blockSearch(dialog, event) {

plugins/indent.js

@@ -1,23 +1,26 @@
 /**
- * Adds indentation using the `Tab` key, and auto-indents after a newline, as well as making it 
+ * Add indentation using the `Tab` key, and auto-indents after a newline, as well as making it 
  * possible to indent/unindent multiple lines using Tab/Shift+Tab
  * Files: indent.js
  */
 codeInput.plugins.Indent = class extends codeInput.Plugin {
 
     numSpaces;
+    bracketPairs = null; // No bracket-auto-indentation used
     indentation = "\t";
     indentationNumChars = 1;
 
     /**
      * Create an indentation plugin to pass into a template
      * @param {Boolean} defaultSpaces Should the Tab key enter spaces rather than tabs? Defaults to false.
      * @param {Number} numSpaces How many spaces is each tab character worth? Defaults to 4.
+     * @param {Object} bracketPairs Opening brackets mapped to closing brackets, default and example {"(": ")", "[": "]", "{": "}"}. All brackets must only be one character, and this can be left as null to remove bracket-based indentation behaviour.
      */
-    constructor(defaultSpaces=false, numSpaces=4) {
+    constructor(defaultSpaces=false, numSpaces=4, bracketPairs={"(": ")", "[": "]", "{": "}"}) {
         super([]); // No observed attributes
 
         this.numSpaces = numSpaces;
+        this.bracketPairs = bracketPairs;
         if(defaultSpaces) {
             this.indentation = "";
             for(let i = 0; i < numSpaces; i++) {
@@ -31,6 +34,7 @@ codeInput.plugins.Indent = class extends codeInput.Plugin {
     afterElementsAdded(codeInput) {
         let textarea = codeInput.textareaElement;
         textarea.addEventListener('keydown', (event) => { this.checkTab(codeInput, event); this.checkEnter(codeInput, event); this.checkBackspace(codeInput, event); });
+        textarea.addEventListener('beforeinput', (event) => { this.checkCloseBracket(codeInput, event); });
     }
 
     /* Event handlers */
@@ -135,6 +139,39 @@ codeInput.plugins.Indent = class extends codeInput.Plugin {
             lines[currentLineI] = lines[currentLineI].substring(0, cursorPosInLine);
         }
 
+        let bracketThreeLinesTriggered = false;
+        let furtherIndentation = "";
+        if(this.bracketPairs != null) {
+            for(let openingBracket in this.bracketPairs) {
+                if(lines[currentLineI][lines[currentLineI].length-1] == openingBracket) {
+                    let closingBracket = this.bracketPairs[openingBracket];
+                    if(textAfterCursor.length > 0 && textAfterCursor[0] == closingBracket) {
+                        // Create new line and then put textAfterCursor on yet another line: 
+                        // {
+                        //   |CARET|
+                        // }
+                        bracketThreeLinesTriggered = true;
+                        for (let i = 0; i < numberIndents+1; i++) {
+                            furtherIndentation += this.indentation;
+                        }
+                    } else {
+                        // Just create new line: 
+                        // {
+                        //   |CARET|
+                        numberIndents++;
+                    }
+                    break;
+                } else {
+                    // Check whether brackets cause unindent
+                    let closingBracket = this.bracketPairs[openingBracket];
+                    if(textAfterCursor.length > 0 && textAfterCursor[0] == closingBracket) {
+                        numberIndents--;
+                        break;
+                    }
+                }
+            }
+        }
+
         // insert our indents and any text from the previous line that might have been after the line break
         for (let i = 0; i < numberIndents; i++) {
             newLine += this.indentation;
@@ -143,6 +180,10 @@ codeInput.plugins.Indent = class extends codeInput.Plugin {
         // save the current cursor position
         let selectionStartI = inputElement.selectionStart;
 
+        if(bracketThreeLinesTriggered) {
+            document.execCommand("insertText", false, "\n" + furtherIndentation); // Write indented line
+            numberIndents += 1; // Reflects the new indent
+        }
         document.execCommand("insertText", false, "\n" + newLine); // Write new line, including auto-indentation
 
         // move cursor to new position
@@ -175,4 +216,22 @@ codeInput.plugins.Indent = class extends codeInput.Plugin {
             document.execCommand("delete", false, "");
         }
     }
+
+    checkCloseBracket(codeInput, event) {
+        if(codeInput.textareaElement.selectionStart != codeInput.textareaElement.selectionEnd) {
+            return;
+        }
+
+        for(let openingBracket in this.bracketPairs) {
+            let closingBracket = this.bracketPairs[openingBracket];
+            if(event.data == closingBracket) {
+                // Closing bracket unindents line
+                if(codeInput.value.substring(codeInput.textareaElement.selectionStart - this.indentationNumChars, codeInput.textareaElement.selectionStart) == this.indentation) {
+                    // Indentation before cursor = delete it
+                    codeInput.textareaElement.selectionStart -= this.indentationNumChars;
+                    document.execCommand("delete", false, "");
+                }
+            }
+        }
+    }
 }