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

@@ -1,8 +1,13 @@
 
-.format-plain {
-    font-weight: normal;
+p {
+    font-size: larger;
 }
 
+.markup_container {
+    border: 3px solid #000000;
+}
+
+// markup classes
 .format-bold {
     font-weight: bold;
 }
@@ -14,3 +19,7 @@
 .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',
 })
@@ -45,175 +78,245 @@ 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[] = this.parsePlaintext("%P{this is a %B{test.} This should be unbolded. But %I{this} should be italicized.}");
-        console.log(nodes);
-        nodes.forEach((node) => {
-            this.renderNode(node);
-        });
+        this.refresh();
     }
 
-    // full demo right here
-    plaintext: String = `
+    // 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
+    `;
 
-    parsePlaintext(input: string): textNode[] {
+    // 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 nodes: textNode[] = [];
+        let index: number = 0; // position in the input string
+        let nodes: (textNode | blockNode)[] = [];
 
-        // starting with ONLY text styles, no structure blocks yet
-        function parseStyle(parentStyles: string | null = null) {
-            index++; // step onto specifier code
-            const code: string = input[index]; // TODO: validate if this code is a usable code
+        // 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) {
+
+            // 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++;
-                console.log(input[index])
                 if(input[index] === "%") { // encountered another style specifier
-
                     // commit the current node
-                    const node: textNode = {
-                        type: "text",
-                        text: text,
-                        styles: styles
-                    };
-                    nodes.push(node);
+                    addTextNode(text, styleList, parentNode);
                     text = ""; // clear the already commited text
                     // and then move to the next
-                    parseStyle(); // recursion
+                    parseStyle(parentNode ? parentNode : null, styleList); // recursion
+
                 } else if(input[index] == "}") { // this node has closed
-                    const node: textNode = {
-                        type: "text",
-                        text: text,
-                        styles: styles
-                    };
-                    nodes.push(node);
+                    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) {
+
+            // step onto format specifier code
+            index++;
+            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);
+            }
+            
+            // create the node
+            const node: blockNode = {
+                type: "block",
+                kind: code,
+                children: [] // this blockNode will get passed to children so they can be added to the parent
+            };
+
+            let text: string = "";
+            while(true) { // assemble text
+                index++;
+                if(input[index] === "%" || input[index] === "#") { // encountered another format specifier
+                    addTextNode(text, null, node);
+                    text = ""; // clear the already commited text
+                    // and then move to the next
+                    if(input[index] === "%") {
+                        parseStyle(node, null); // pass in the current node as the future node's parent
+                    } else if(input[index] === "#") {
+                        parseStructure(node);
+                    }
+                } else if(input[index] == "}") { // this node has closed
+                    index++;
+                    // add its text
+                    addTextNode(text, null, node);
+                    // push node to children list
+                    if(parentNode) {
+                        parentNode.children.push(node);
+                    } else {
+                        nodes.push(node);
+                    }
+
+                    break;
+                } else { // regular text
+                    text += input[index];
+                }
+                if(index >= input.length) {
+                    break;
+                }
+            }
+        }
+
+        function addTextNode(text: string, styles: string[] | null = null, parentNode: blockNode | null = null) {
+            if(text.length === 0) return;
+            const textNode: textNode = {
+                type: "text",
+                text: text,
+                styles: styles ? styles : []
+            }
+            if(parentNode) {
+                parentNode.children.push(textNode);
+            } else {
+                nodes.push(textNode);
+            }
+        }
+
         function parse(endChar: string | null = null) {
-            console.log("parsing...");
+            let currentText: string = "";
             while(index < input.length) {
                 if(endChar && (input[index] === endChar)) {
                     index++;
                     break;
                 }
                 if(input[index] === "%") { // encountered a style specifier
+                    addTextNode(currentText);
                     parseStyle();
+                    currentText = "";
                 } else if(input[index] === "#") { // encountered a structure specifier
-                    // nodes.push(parseStructure());
+                    addTextNode(currentText);
+                    parseStructure();
+                    currentText = "";
                 } else if(input[index] === "@") { // encountered an attribute specifier
-                    // nodes.push(parseAttribute());
+                    // nodes.push(parseAttribute()); // TODO: implement
                 } else {
                     // regular character
+                    currentText += input[index];
                     index++;
                 }
             }
+            addTextNode(currentText);
         }
 
-        /* pseudocode (c lol)
-
-        int index = 0;
-
-        void parse(char endChar = null, formatDescriptor[]) {
-            const nodes = []; // start with an empty list of nodes
-
-            while(index < input.length) { // iterate over the input string
-                // break if } encountered, step forward (this format block has exited)
-                if(endChar && (input[pos] == endChar)) {
-                    index++;
-                    break;
-                }
-
-                if(input[index] == "%") {
-                    nodes.push(parseStyle(...));
-                } else if(input[index] == "#") {
-                    nodes.push(parseBlock(...));
-                } else {
-                    nodes.push(parseText(...));
-                }
-
-                return mergeAdjacentText(nodes);
-            }
-        
-        }
-
-        void parseStyle(parentStyle) {
-            index++; // step onto specifier
-            char code = readIdentifier(input[index])
-            index++;
-            expect("{"); // parsing error if not
-            const styles = [...parentStyles, code] // append style code to styles list of this node
-            const children = parseUntil("}", styles); // recursion probably
-
-            return children
-        }
-        ... and so on for parseBlock and parseText
-
-        */
-
         parse();
 
         return nodes;
     }
 
-    renderNode(node: textNode): void {
+    renderNode(node: textNode | blockNode, parentContainer: any = null): void {
 
-        console.log("rendering...");
-
-        if(node.type == "text") { // text nodes only need span elements
+        if("styles" in node) { // this node is a textNode
 
             const span = this.renderer.createElement("span"); // create container
 
-            node.styles.forEach((style) => {
+            node.styles.forEach((style: string) => {
                 this.renderer.addClass(span, styles[style].className);
             });
 
             const text = this.renderer.createText(node.text); // create text
 
             this.renderer.appendChild(span, text); // add text to container
-            this.renderer.appendChild(this.container.nativeElement, span); // add container to DOM
-
-        } /* else if(node.type == "block") {
-        
-            element block = html.createElement(node.kind); // or whatever it is
-            
-            // recursion
-            foreach(nodeType child in node.children) {
-                block.children.add(renderNode(child));
+            if(parentContainer) { // this container is a child
+                this.renderer.appendChild(parentContainer, span);
+            } else { // add to the top-level DOM
+                this.renderer.appendChild(this.container.nativeElement, span);
             }
-            return block;
 
-        } */
+        } else if("kind" in node) { // this is a blockNode
+
+            let container: any;
+            container = this.renderer.createElement(blocks[node.kind].className);
+
+            node.children.forEach((child: textNode | blockNode) => {
+                if("styles" in child) { // this is a textNode
+                    if(child.styles.length === 0) {
+                        // just add text
+                        const text = this.renderer.createText(child.text); // create text
+                        this.renderer.appendChild(container, text); // add text to container
+                    } else {
+                        // render styles
+                        this.renderNode(child, container); // recursion
+                    }
+                } else if("kind" in child) { // this is a block node
+                    this.renderNode(child, container); // recursion
+                }
+            });
+
+            // add container to DOM
+            if(parentContainer) { // this container is a child
+                this.renderer.appendChild(parentContainer, container);
+            } else { // add to the top-level DOM
+                this.renderer.appendChild(this.container.nativeElement, container);
+            }
+        }
 
         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);
+        });
+
+    }
 }