All files / virtual-dom html.ts

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import { EventHandler } from "./interfaces";
import ElementNode from "./nodes/ElementNode";
import MarkupParsingResult from "./MarkupParsingResult";
import markupToVirtualNode from "./markupToVirtualNode";
import { isBlankOrWhiteSpace } from "../utils/string";
 
/**
 * Template tag to generate the virtual node from the string
 */
export default function html(strings: TemplateStringsArray, ...values: any): MarkupParsingResult {
 
    const parts: MarkupParsingResult[] = [];
 
    const eventHandlers: EventHandler[] = [];
 
    const markup = processMarkup(strings, values, parts, eventHandlers);
 
    const result = markupToVirtualNode(markup, 'html', { excludeTextWithWhiteSpacesOnly: true });
 
    let node = result.node as Node;
 
    //const vnode = result.vnode as ElementNode;
 
    Iif (parts.length > 0) {
 
        // const comments = node.childNodes !== undefined ?
        //     Array.from(node.childNodes)
        //         .filter(n => n.nodeType === Node.COMMENT_NODE) :
        //     [];
 
        const comments = getAllComments(node.childNodes);
 
        parts.forEach((part, i) => {
 
            const partNode = part.node as Node;
 
            // Add as a child of the vnode
            //vnode.children.push(part.vnode as any);
 
            // const comment = comments.length > i ?
            //     comments[i] :
            //     undefined;
 
            // if (comment !== undefined) { // Prepend its DOM node to the next comment placeholder of the dom node
 
            //     node.insertBefore(partNode, comment);
            // }
            // else { // Add the part and the marker
 
            //     node.insertBefore(partNode, null);
 
            //     node.insertBefore(new Comment(), null);
            // }
 
            const comment = comments[i];
            
            comment.parentNode.insertBefore(partNode, comment);
        });
    }
 
    if (eventHandlers.length > 0) {
 
        eventHandlers.forEach(eh => node.addEventListener(eh.name, eh.handler));
    }
 
    return result;
}
 
function processMarkup(strings: TemplateStringsArray, values: any, parts: any[], eventHandlers: EventHandler[]) {
 
    const markupParts: string[] = [];
 
    const length = values.length;
 
    for (let i = 0; i < length; ++i) {
 
        const markupPart = processMarkupPart(
            strings !== undefined ? strings[i] : '',
            values[i],
            parts,
            eventHandlers);
 
        Eif (!isBlankOrWhiteSpace(markupPart)) {
 
            markupParts.push(markupPart);
        }
    }
 
    Eif (strings !== undefined) {
 
        markupParts.push(strings[length]); // Add the last string
    }
 
    return markupParts.join('');
}
 
function processMarkupPart(leftSide: string, value: any, parts: any[], eventHandlers: EventHandler[]): string {
 
    Iif (value === undefined ||
        value === null ||
        value === '') {
 
        return removeRightMember(leftSide);
    }
 
    if (typeof value === 'function') {
 
        const fcnName = getFunctionName(leftSide);
 
        Eif (fcnName !== null) { // Add an event handler
 
            eventHandlers.push({
 
                name: fcnName.replace('on', ''),
                handler: value
            });
        }
        else {
 
            throw Error('Not implemented');
        }
 
        return removeRightMember(leftSide);
    }
 
    Iif (Array.isArray(value) && isMarkupParsingResult(value[0])) { // Recurse for every item of the array
 
        return processMarkup(undefined, value, parts, eventHandlers);
    }
 
    Iif (isMarkupParsingResult(value)) { // Handle virtual nodes
 
        parts.push(value);
 
        return `${leftSide}<!---->`; // Set the placeholder
    }
 
    if (typeof value === 'object') {
 
        if (leftSide.endsWith('=')) { // It is an attribute
 
            return `${leftSide}'${JSON.stringify(value)}'`;
        }
        else { // It is a text node
 
            return JSON.stringify(value); // Show the raw data
        }
    }
 
    // A primitive type
    if (leftSide.endsWith('=')) { // It is an attribute
 
        return `${leftSide}"${value}"`;
    }
    else { // It is a text node
 
        return `${leftSide}${value}`;
    }
}
 
/**
 * Removes the rightmost member of a string
 * Assumes that it always has the = operator
 */
function removeRightMember(str: string): string {
 
    let lastSpace = str.lastIndexOf(' ');
 
    Iif (lastSpace == -1) {
 
        lastSpace = 0;
    }
 
    return str.substring(lastSpace, str.lastIndexOf(str));
}
 
function getFunctionName(leftSide: string): string | null {
 
    const parts = leftSide.split(' ');
 
    for (let i = 0; i < parts.length; ++i) {
 
        const functionName = parts[i].trim().toLocaleLowerCase();
 
        if (functionName[0] === 'o' && functionName[1] === 'n') {
 
            return functionName.replace('=', '');
        }
    }
 
    return null;
}
 
function isMarkupParsingResult(value: any) {
 
    const type = typeof value;
 
    if (type === 'string' ||
        type === 'number') {
 
        return false;
    }
 
    return ('vnode' in value &&
        'node' in value);
}
 
function getAllComments(childNodes: NodeListOf<ChildNode>) : Comment[] {
 
    let comments = [];
 
    if (childNodes === undefined) {
 
        return comments;
    }
 
    childNodes.forEach(childNode => {
        
        if (childNode.nodeType === Node.COMMENT_NODE) {
 
            comments.push(childNode);
        }
 
        if (childNode.childNodes.length > 0) {
 
            comments = [...comments, ...getAllComments(childNode.childNodes)];
        }  
    });
 
    return comments;
}