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import {
DocumentNode,
NodeWithChildren,
TagNode,
TextNode,
CommentNode,
CDATANode,
ProcessingInstructionNode,
MVarNode,
MFragmentNode,
MSlotNode,
MContentNode,
MImportNode,
MIfNode,
MScopeNode,
MForNode,
MForOfNode,
MForInNode,
MElseNode,
MElseIfNode,
MDataNode,
ExternalStyleNode,
InternalStyleNode,
StyleNodeBind,
StyleNode,
ScriptNode,
ExternalScriptNode,
InternalScriptNode,
UncompiledScriptNode,
UncompiledStyleNode,
AnchorNode,
UncompiledAnchorNode,
CompiledAnchorNode,
parseAnchorNodeResolve,
MWhitespaceNode,
MWhitespaceNodeMode
} from './node';
import {MimeType} from '..';
import {convertCamelCaseToSnakeCase} from '../util/caseUtils';
/**
* Parses HTML into a dom using htmlparser2
*/
export class DomParser {
/**
* DomHandler instance that receives callbacks from {@link parser}
*/
private readonly handler: DomHandler;
/**
* HTML parser instance
*/
private readonly parser: Parser;
/**
* Creates a new DomParser instance
* @param userOptions Optional options to pass to htmlparser2
*/
constructor(userOptions?: ParserOptions) {
// get parser options
const options = createParserOptions(userOptions);
// set up handler
this.handler = new DomHandler();
// create parser
this.parser = new Parser(this.handler, options);
}
/**
* Parse a string of HTML into a DOM
* @param html HTML to parse
* @returns a DocumentNode containing parsed HTML
*/
parseDom(html: string): DocumentNode {
// reset parser
this.parser.reset();
// process html
this.parser.write(html);
this.parser.end();
// get generated dom
return this.handler.getDom();
}
}
/**
* Creates an instance of ParserOptions.
* Loads defaults and optionally overrides with a provided instance
* @param userOptions optional options to include
*/
function createParserOptions(userOptions?: ParserOptions): ParserOptions {
// base (default) options
const options: ParserOptions = {
recognizeSelfClosing: true,
lowerCaseTags: true
};
// load user-supplied options
if (userOptions !== undefined) {
Object.assign(options, userOptions);
}
return options;
}
/**
* Implementation of htmlparser2's Handler interface that generates a DOM from the parsed HTML.
*/
export class DomHandler implements Partial<Handler> {
/**
* DOM containing parsed nodes
*/
private dom: DocumentNode;
/**
* Current parent node.
* The next incoming node will be attached as a child to this node
*/
private currentParent: NodeWithChildren;
/**
* Creates a new DomHandler.
* The instance will be fully initialized and ready to begin receiving callbacks from htmlparser2
*/
constructor() {
this.dom = new DocumentNode();
this.currentParent = this.dom;
}
/**
* Gets the generated DOM in its current state
* @returns a DocumentNode containing all parsed HTML
*/
getDom(): DocumentNode {
return this.dom;
}
onreset(): void {
this.dom = new DocumentNode();
this.currentParent = this.dom;
}
onerror(error: Error): void {
throw error;
}
onopentag(name: string, attribs: { [s: string]: string }): void {
// normalize tag name
const tagName = name.toLowerCase();
// copy attribs
const attributes = new Map<string, string | null>();
for (const key of Object.keys(attribs)) {
const attrVal = attribs[key];
const value: string | null = attrVal.length > 0 ? attrVal : null;
attributes.set(key, value);
}
// create tag
const tag: TagNode = DomHandler.createTagNode(tagName, attributes);
this.pushParent(tag);
}
onclosetag(): void {
this.popParent();
}
ontext(data: string): void {
// create text node
const textNode = new TextNode(data);
// append to parent
this.currentParent.appendChild(textNode);
}
oncomment(data: string): void {
// create comment node
const commentNode = new CommentNode(data);
// append to parent
this.currentParent.appendChild(commentNode);
}
oncdatastart(): void {
// create cdata node
const cdataNode = new CDATANode();
// append to parent
this.currentParent.appendChild(cdataNode);
// set as parent
this.pushParent(cdataNode);
}
oncdataend(): void {
this.popParent();
}
onprocessinginstruction(name: string, data: string): void {
// create node
const piNode = new ProcessingInstructionNode(name, data);
// append to parent
this.currentParent.appendChild(piNode);
}
/**
* Attaches a node to the current parent, and then sets the new node as the current parent.
* @param node Node to attach
*/
private pushParent(node: NodeWithChildren): void {
// attach to parent
this.currentParent.appendChild(node);
// push node
this.currentParent = node;
}
/**
* "closes" the current parent and sets its parent as the current
*/
private popParent(): void {
Iif (this.currentParent === this.dom) {
throw new Error('Tried to close too many tags: DOM is currentParent');
}
this.currentParent = this.currentParent.parentNode ?? this.dom;
}
/**
* Creates an instance of TagNode or one of its subclasses based on the provided tag data.
* @param tagName Name of the tag to create
* @param attributes Tag attributes
* @returns Instance of TagNode or a subclass
*/
private static createTagNode(tagName: string, attributes: Map<string, string | null>): TagNode {
switch (tagName) {
case 'm-fragment':
return DomHandler.createMFragmentNode(attributes);
case 'm-slot':
return DomHandler.createMSlotNode(attributes);
case 'm-content':
return DomHandler.createMContentNode(attributes);
case 'm-var':
return new MVarNode(attributes);
case 'm-scope':
return new MScopeNode(attributes);
case 'm-import':
return DomHandler.createMImportNode(attributes);
case 'm-if':
return DomHandler.createMIfNode(attributes);
case 'm-else-if':
return DomHandler.createMElseIfNode(attributes);
case 'm-else':
return new MElseNode(attributes);
case 'm-for':
return DomHandler.createMForNode(attributes);
case 'm-data':
return DomHandler.createMDataNode(attributes);
case 'style':
return DomHandler.createStyleNode(attributes);
case 'script':
return DomHandler.createScriptNode(attributes);
case 'a':
return DomHandler.createAnchorNode(attributes);
case 'm-whitespace':
return DomHandler.createMWhitespaceNode(attributes);
default:
return new TagNode(tagName, attributes);
}
}
private static createMFragmentNode(attributes: Map<string, string | null>): MFragmentNode {
const src = attributes.get('src');
Iif (src === undefined || src === null) throw new Error('Parse error: <m-fragment> is missing required attribute: src');
return new MFragmentNode(src, attributes);
}
private static getSlotAttribute(attributes: Map<string, string | null>): string | undefined {
const slot = attributes.get('slot');
return slot !== undefined ? String(slot) : undefined;
}
private static createMSlotNode = (attributes: Map<string, string | null>): MSlotNode => {
const slot = DomHandler.getSlotAttribute(attributes);
return new MSlotNode(slot, attributes);
};
private static createMContentNode = (attributes: Map<string, string | null>): MContentNode => {
const slot = DomHandler.getSlotAttribute(attributes);
return new MContentNode(slot, attributes);
};
private static createMImportNode(attributes: Map<string, string | null>): MImportNode {
const src = attributes.get('src');
Iif (src === undefined || src === null) throw new Error('Parse error: <m-import> is missing required attribute: src');
// default "as" if not specified
let as = attributes.get('as');
if (as === undefined || as === null) {
// extract file name (find the section of text between the last slash or start-of-input and the next period or end of input).
const srcFileNameMatch = src.match(/([\\/]|^)([^\\/\r\n.]+)[^\\/\r\n]*$/);
Iif (srcFileNameMatch === null) {
throw new Error(`Parse error: attribute 'as' not specified for <m-import>, and it could not be inferred from the value of "src"`);
}
const srcFileName = srcFileNameMatch[2].trim();
// convert to attribute case and use as "as"
as = convertCamelCaseToSnakeCase(srcFileName);
}
return new MImportNode(src, as, attributes);
}
private static createMIfNode(attributes: Map<string, string | null>): MIfNode {
const expression = attributes.get('?');
Iif (expression === undefined) throw new Error('Parse error: <m-if> is missing required attribute: ?');
return new MIfNode(expression, attributes);
}
private static createMElseIfNode(attributes: Map<string, string | null>): MElseIfNode {
const expression = attributes.get('?');
Iif (expression === undefined) throw new Error('Parse error: <m-else-if> is missing required attribute: ?');
return new MElseIfNode(expression, attributes);
}
private static createMForNode(attributes: Map<string, string | null>): MForNode {
const varName = attributes.get('var');
Iif (varName === undefined || varName === null) throw new Error('Parse error: <m-for> is missing required attribute: varName');
const indexName = attributes.get('index') ?? undefined;
const ofExpression = attributes.get('of') ?? undefined;
const inExpression = attributes.get('in') ?? undefined;
if (ofExpression !== undefined && inExpression === undefined) {
return new MForOfNode(ofExpression, varName, indexName, attributes);
} else Eif (inExpression !== undefined && ofExpression === undefined) {
return new MForInNode(inExpression, varName, indexName, attributes);
} else {
throw new Error('Parse error: <m-for> must have exactly one of these attributes: [of,in]');
}
}
private static createMDataNode(attributes: Map<string, string | null>): MDataNode {
const type = attributes.get('type');
Iif (type === undefined) throw new Error('Parse error: <m-data> is missing required attribute: type');
Iif (type !== MimeType.JSON && type !== MimeType.TEXT) throw new Error(`Parse error: <m-data> has invalid value for attribute 'type': '${ type }'`);
return new MDataNode(type, attributes);
}
private static createStyleNode(attributes: Map<string, string | null>): StyleNode {
// Get lang
const lang = attributes.get('lang') ?? undefined;
// "uncompiled" style nodes should be passed on as-is
if (!attributes.has('compiled')) {
return new UncompiledStyleNode(lang, attributes);
}
// "compiled" style nodes need further processing
const bind = attributes.get('bind') ?? undefined;
Iif (bind !== undefined && bind !== StyleNodeBind.HEAD && bind !== StyleNodeBind.LINK) {
throw new Error(`Parse error: 'style' tag has invalid value for attribute 'bind': '${ bind }'`);
}
const skipFormat = attributes.has('skip-format');
const src = attributes.get('src');
if (src) {
return new ExternalStyleNode(src, bind, skipFormat, lang, attributes);
} else {
return new InternalStyleNode(bind, skipFormat, lang, attributes);
}
}
private static createScriptNode(attributes: Map<string, string | null>): ScriptNode {
// "uncompiled" script nodes should be passed on as-is
if (!attributes.has('compiled')) {
return new UncompiledScriptNode(attributes);
}
// "compiled" script nodes need further processing
const src = attributes.get('src');
if (src) {
return new ExternalScriptNode(src, attributes);
} else {
return new InternalScriptNode(attributes);
}
}
private static createAnchorNode(attributes: Map<string, string | null>): AnchorNode {
// "uncompiled" anchor nodes should be passed on as-is
Iif (!attributes.has('compiled')) {
return new UncompiledAnchorNode(attributes);
}
const href = attributes.get('href');
Iif (href === undefined || href === null) throw new Error('Parse error: <a> is missing required attribute: href');
const resolve = parseAnchorNodeResolve(attributes.get('resolve') ?? undefined);
return new CompiledAnchorNode(href, resolve, attributes);
}
private static createMWhitespaceNode(attributes: Map<string, string | null>): MWhitespaceNode {
// parse mode
const mode = attributes.get('mode') ?? undefined;
Iif (mode !== undefined && mode !== MWhitespaceNodeMode.SENSITIVE && mode !== MWhitespaceNodeMode.INSENSITIVE) {
throw new Error(`Parse error: 'm-whitespace' tag has invalid value for attribute 'bind': '${ mode }'`);
}
return new MWhitespaceNode(mode, attributes);
}
} |