add strikethrough (somewhat broken)

client/src/app/markleft/markleft.html

@@ -1,3 +1,4 @@
-<p>markleft works!</p>
 
-<div #markup_container></div>
+<textarea [(ngModel)]="liveText" (ngModelChange)="onTextUpdate($event)"></textarea>
+
+<div #markup_container class="markup_container"></div>

client/src/app/markleft/markleft.scss

@@ -3,6 +3,11 @@ p {
     font-size: larger;
 }
 
+.markup_container {
+    border: 3px solid #000000;
+}
+
+// markup classes
 .format-bold {
     font-weight: bold;
 }
@@ -14,3 +19,7 @@ p {
 .format-underline {
     text-decoration: underline solid #000000 3px;
 }
+
+.format-strikethrough {
+    text-decoration: line-through;
+}

client/src/app/markleft/markleft.ts

@@ -1,17 +1,24 @@
 import { Component, ElementRef, Renderer2, ViewChild } from '@angular/core';
+import { FormsModule } from '@angular/forms'
 
 // type descriptions
 
+// a formatDescriptor contains information for the renderer to apply formatting styles to a node
 interface formatDescriptor {
     className: string;
 };
 
+// a textNode is an element produced by the parser to link text to applied format specifiers. The renderer will
+// apply each style to the text in the node according to the styles registry.
 interface textNode {
     type: string;
     text: string;
     styles: string[]
 }
 
+// a blockNode is an element produced by the parser to structure nodes by blocks. blocks contain child nodes, either
+// other blocks or text nodes at the bottom. A block node's html element type is described by kind: p, h1, h2, div, etc
+// Maybe we blocks can also have styles, and then we can join textNode and blockNode into a single type.
 interface blockNode {
     type: string;
     kind: string;
@@ -19,6 +26,7 @@ interface blockNode {
 }
 
 // styles registry: this maps format specifiers to css classes
+// might move this to its own file
 const styles: Record<string, formatDescriptor> = {
     B: {
         className: "format-bold"
@@ -29,14 +37,39 @@ const styles: Record<string, formatDescriptor> = {
     U: {
         className: "format-underline"
     },
-    P: { // for testing. TODO: right now everything is a style
-        className: "format-plain"
-    },
+    S: {
+        className: "format-strikethrough"
+    } // TODO: some css style elements cannot simply be overlapped. strikethrough and underline both use the
+    // "text decoration" tag so simply applying both will overwrite one of the styles. some extra logic will have to
+    // be put in place to add a combined "format-strikethrough-formatunderline" style in which the text decoration
+    // contains both.
 }; // i.e. %B{...} will apply "format-bold"
 
+// blocks registry: this maps format specifiers to html block types
+// if moved to another file, should stick next to the styles registry
+const blocks: Record<string, formatDescriptor> = {
+    H1: {
+        className: "h1"
+    },
+    H2: {
+        className: "h2"
+    },
+    H3: {
+        className: "h3"
+    },
+    P: {
+        className: "p"
+    },
+    D: {
+        className: "div"
+    }
+    // TODO: lists
+}; // i.e. #H1{...} will create a h1 element
+
+// angular component class
 @Component({
     selector: 'app-markleft',
-    imports: [],
+    imports: [FormsModule],
     templateUrl: './markleft.html',
     styleUrl: './markleft.scss',
 })
@@ -45,88 +78,94 @@ export class Markleft {
     @ViewChild('markup_container', { static: true }) container!: ElementRef;
 
     constructor(private renderer: Renderer2) {
-        console.log("component constructor");
+        
     }
 
     ngOnInit() { // DOM manipulation can't occur in constructor
-
-        const nodes: (textNode | blockNode)[] = this.parsePlaintext(this.plaintext);
-        console.log(nodes)
-        nodes.forEach((node) => {
-            this.renderNode(node);
-        });
+        this.refresh();
     }
 
-    // full demo right here
-    plaintext: string = `
-        #H{Hello World!}
+    // live update on each text input.
+    onTextUpdate(event: Event) {
+        this.refresh();
+    }
+
+    // default text
+    liveText: string = `
+        #H1{Hello World!}
+        #H2{hi mom !!}
         #P{
-            This is some markleft text. This is %I{italic} and this is %B{bold}. Some might %I{even be %B{both}}.
+            This is some %B{PhAML} (%I{%B{Ph}ishly %B{A}mazing %B{M}arkup %B{L}anguage}) text. This is %I{italic} and this is %B{bold}. Some might %I{even be %B{both}}.
         }
         This should be plain and unstylized.
-    `; // TODO: live editor
+    `;
 
+    // parses a single string into an array of nodes
+    // like noted at parseStyle, maybe can return a single node which itself contains the array of children.
     parsePlaintext(input: string): (textNode | blockNode)[] {
 
-        let index: number = 0;
+        let index: number = 0; // position in the input string
         let nodes: (textNode | blockNode)[] = [];
 
+        // TODO: I might restructure the node parsing so that it starts with a generic top level node and can process all children under that node
         function parseStyle(parentNode: blockNode | null = null, parentStyles: string[] | null = null) {
 
-            index++; // step onto specifier code
-            const code: string = input[index]; // TODO: validate if this code is a usable code
+            // step onto format specifier code
             index++;
-            if(input[index] !== "{") { // TODO: implement some expect("{") function to better validate
-                console.log("{ not found following format specifier");
-                // return null node
+            let codeIndexStart: number = index;
+            while(input[index] != "{") { // continue stepping forward until we hit a { character
+                index++;
+                if(index >= input.length) break;
+            } 
+            // the resulting substring between the style character and the { is our style code
+            const code: string = input.substring(codeIndexStart, index); 
+            if(!(code in styles)) {
+                console.log("Style identifier is not recognized: ", code);
             }
-            console.log("Parsing text for format specifier", code);
 
-            let styles: string[] = [];
+            let styleList: string[] = [];
             if(parentStyles) {
-                styles = [...parentStyles, code] // append style code to styles list of this node
+                styleList = [...parentStyles, code] // append style code to styles list of this node
             } else {
-                styles = [code];
+                styleList= [code];
             }
             
             let text: string = "";
             while(true) { // assemble text
                 index++;
                 if(input[index] === "%") { // encountered another style specifier
-
                     // commit the current node
-                    const node: textNode = {
-                        type: "text",
-                        text: text,
-                        styles: styles
-                    };
-                    if(parentNode) {
-                        parentNode.children.push(node);
-                    } else {
-                        nodes.push(node);
-                    }
+                    addTextNode(text, styleList, parentNode);
                     text = ""; // clear the already commited text
                     // and then move to the next
-                    parseStyle(parentNode ? parentNode : null, styles); // recursion
+                    parseStyle(parentNode ? parentNode : null, styleList); // recursion
+
                 } else if(input[index] == "}") { // this node has closed
-                    addTextNode(text, styles, parentNode);
-                    //index++; // step to next
+                    addTextNode(text, styleList, parentNode);
                     break;
                 } else { // regular text
-                    text += input[index];
+                    text += input[index]; // append character to the text string
+                }
+                if(index >= input.length) {
+                    break;
                 }
             }
         }
 
         function parseStructure(parentNode: blockNode | null = null) {
-            index++; // step onto specifier code
-            const code: string = input[index]; // TODO: validate if this code is a usable code
+
+            // step onto format specifier code
             index++;
-            if(input[index] !== "{") { // TODO: implement some expect("{") function to better validate
-                console.log("{ not found following format specifier");
-                // return null node
+            let codeIndexStart: number = index;
+            while(input[index] != "{") { // continue stepping forward until we hit a { character
+                index++;
+                if(index >= input.length) break;
+            } 
+            // the resulting substring between the style character and the { is our style code
+            const code: string = input.substring(codeIndexStart, index); 
+            if(!(code in blocks)) {
+                console.log("Code is not recognized: ", code);
             }
-            console.log("Parsing structure for format specifier", code);
             
             // create the node
             const node: blockNode = {
@@ -139,17 +178,7 @@ export class Markleft {
             while(true) { // assemble text
                 index++;
                 if(input[index] === "%" || input[index] === "#") { // encountered another format specifier
-
-                    // commit current plain text to the block
-                    if(text.length !== 0) {
-                        const textNode: textNode = {
-                            type: "text",
-                            text: text,
-                            styles: [] // none
-                        };
-                        node.children.push(textNode);
-                    }
-                    
+                    addTextNode(text, null, node);
                     text = ""; // clear the already commited text
                     // and then move to the next
                     if(input[index] === "%") {
@@ -161,7 +190,6 @@ export class Markleft {
                     index++;
                     // add its text
                     addTextNode(text, null, node);
-
                     // push node to children list
                     if(parentNode) {
                         parentNode.children.push(node);
@@ -173,6 +201,9 @@ export class Markleft {
                 } else { // regular text
                     text += input[index];
                 }
+                if(index >= input.length) {
+                    break;
+                }
             }
         }
 
@@ -191,7 +222,6 @@ export class Markleft {
         }
 
         function parse(endChar: string | null = null) {
-            console.log("parsing...");
             let currentText: string = "";
             while(index < input.length) {
                 if(endChar && (input[index] === endChar)) {
@@ -207,7 +237,7 @@ export class Markleft {
                     parseStructure();
                     currentText = "";
                 } else if(input[index] === "@") { // encountered an attribute specifier
-                    // nodes.push(parseAttribute());
+                    // nodes.push(parseAttribute()); // TODO: implement
                 } else {
                     // regular character
                     currentText += input[index];
@@ -244,13 +274,7 @@ export class Markleft {
         } else if("kind" in node) { // this is a blockNode
 
             let container: any;
-            if(node.kind === "H") { // TODO: registry for block types
-                container = this.renderer.createElement("h1");
-            } else if(node.kind === "P") {
-                container = this.renderer.createElement("p");
-            } else {
-                console.log("container type not recognized");
-            }
+            container = this.renderer.createElement(blocks[node.kind].className);
 
             node.children.forEach((child: textNode | blockNode) => {
                 if("styles" in child) { // this is a textNode
@@ -277,4 +301,22 @@ export class Markleft {
 
         return;
     }
+
+    refresh() {
+
+        // clear children
+        const parent = this.container.nativeElement;
+        while (parent.firstChild) {
+            this.renderer.removeChild(parent, parent.firstChild);
+        }
+
+        // parse text
+        const nodes: (textNode | blockNode)[] = this.parsePlaintext(this.liveText);
+
+        // render nodes
+        nodes.forEach((node) => {
+            this.renderNode(node);
+        });
+
+    }
 }