Added to/from xml helpers

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@ztimson/utils",
-	"version": "0.28.14",
+	"version": "0.28.17",
 	"description": "Utility library",
 	"author": "Zak Timson",
 	"license": "MIT",

src/csv.ts

@@ -14,41 +14,55 @@ import {LETTER_LIST} from './string.ts';
 export function fromCsv<T = any>(csv: string, hasHeaders = true): T[] {
 	function parseLine(line: string): (string | null)[] {
 		const columns: string[] = [];
-		let current = '', inQuotes = false;
+		let current = '', inQuotes = false, quoteChar: string | null = null;
 		for (let i = 0; i < line.length; i++) {
 			const char = line[i];
 			const nextChar = line[i + 1];
-			if (char === '"') {
-				if (inQuotes && nextChar === '"') {
-					current += '"'; // Handle escaped quotes
+			if ((char === '"' || char === "'") && !inQuotes) {
+				inQuotes = true;
+				quoteChar = char;
+			} else if (char === quoteChar && inQuotes) {
+				if (nextChar === quoteChar) {
+					current += quoteChar; // Handle escaped quotes
 					i++;
-				} else inQuotes = !inQuotes;
+				} else {
+					inQuotes = false;
+					quoteChar = null;
+				}
 			} else if (char === ',' && !inQuotes) {
-				columns.push(current.trim()); // Trim column values
+				columns.push(current.trim());
 				current = '';
 			} else current += char;
 		}
-		columns.push(current.trim()); // Trim last column value
-		return columns.map(col => col.replace(/^"|"$/g, '').replace(/""/g, '"'));
+		columns.push(current.trim());
+		return columns.map(col => {
+			// Remove surrounding quotes (both " and ')
+			col = col.replace(/^["']|["']$/g, '');
+			// Unescape doubled quotes
+			return col.replace(/""/g, '"').replace(/''/g, "'");
+		});
 	}
 
-	// Normalize line endings and split rows
 	const rows = [];
-	let currentRow = '', inQuotes = false;
-	for (const char of csv.replace(/\r\n/g, '\n')) { // Normalize \r\n to \n
-		if (char === '"') inQuotes = !inQuotes;
+	let currentRow = '', inQuotes = false, quoteChar: string | null = null;
+	for (const char of csv.replace(/\r\n/g, '\n')) {
+		if ((char === '"' || char === "'") && !inQuotes) {
+			inQuotes = true;
+			quoteChar = char;
+		} else if (char === quoteChar && inQuotes) {
+			inQuotes = false;
+			quoteChar = null;
+		}
 		if (char === '\n' && !inQuotes) {
-			rows.push(currentRow.trim()); // Trim row
+			rows.push(currentRow.trim());
 			currentRow = '';
 		} else currentRow += char;
 	}
-	if (currentRow) rows.push(currentRow.trim()); // Trim last row
+	if (currentRow) rows.push(currentRow.trim());
 
-	// Extract headers
 	let headers: any = hasHeaders ? rows.splice(0, 1)[0] : null;
 	if (headers) headers = headers.match(/(?:[^,"']+|"(?:[^"]|"")*"|'(?:[^']|'')*')+/g)?.map((h: any) => h.trim());
 
-	// Parse rows
 	return <T[]>rows.map(r => {
 		const props = parseLine(r);
 		const h = headers || (Array(props.length).fill(null).map((_, i) => {
@@ -65,7 +79,6 @@ export function fromCsv<T = any>(csv: string, hasHeaders = true): T[] {
 	});
 }
 
-
 /**
  * Convert an array of objects to a CSV string
  *

src/index.ts

@@ -1,3 +1,5 @@
+export * from 'var-persist';
+
 export * from './arg-parser';
 export * from './array';
 export * from './aset';
@@ -23,4 +25,4 @@ export * from './template';
 export * from './time';
 export * from './tts';
 export * from './types';
-export * from 'var-persist';
+export * from './xml';

src/string.ts

@@ -27,6 +27,31 @@ export function camelCase(str?: string): string {
 	return pascal.charAt(0).toLowerCase() + pascal.slice(1);
 }
 
+/**
+ * Decode HTML escaped characters
+ * @param html HTML to clean up
+ * @returns {any}
+ */
+export function decodeHtml(html: string) {
+	return html
+		.replace(/ /g, '\u00A0')
+		.replace(/"/g, '"')
+		.replace(/'/g, "'")
+		.replace(/&lt;/g, '<')
+		.replace(/&gt;/g, '>')
+		.replace(/&cent;/g, '¢')
+		.replace(/&pound;/g, '£')
+		.replace(/&yen;/g, '¥')
+		.replace(/&euro;/g, '€')
+		.replace(/&copy;/g, '©')
+		.replace(/&reg;/g, '®')
+		.replace(/&trade;/g, '™')
+		.replace(/&times;/g, '×')
+		.replace(/&divide;/g, '÷')
+		.replace(/&#(\d+);/g, (match, dec) => String.fromCharCode(dec))
+		.replace(/&#x([0-9a-fA-F]+);/g, (match, hex) => String.fromCharCode(parseInt(hex, 16)))
+		.replace(/&amp;/g, '&'); // Always last!
+}
 
 /**
  * Convert number of bytes into a human-readable size

src/xml.ts

@@ -0,0 +1,155 @@
+/**
+ * Parses an XML string into a structured JavaScript object.
+ * @param {string} xml - The XML string to parse
+ * @returns {Object} An object with `tag`, `attributes`, and `children` properties
+ */
+export function fromXml(xml: string) {
+	xml = xml.trim();
+	let pos = 0;
+
+	function parseNode(): any {
+		skipWhitespace();
+		if(xml[pos] !== '<') return parseText();
+		pos++; // skip <
+
+		if(xml[pos] === '?') {
+			parseDeclaration();
+			return parseNode();
+		}
+
+		if(xml[pos] === '!') {
+			parseComment();
+			return parseNode();
+		}
+
+		const tagName = parseTagName();
+		const attributes = parseAttributes();
+		skipWhitespace();
+
+		if(xml[pos] === '/' && xml[pos + 1] === '>') {
+			pos += 2; // skip />
+			return { tag: tagName, attributes, children: [] };
+		}
+
+		pos++; // skip >
+		const children = [];
+		while(pos < xml.length) {
+			skipWhitespace();
+			if(xml[pos] === '<' && xml[pos + 1] === '/') {
+				pos += 2; // skip </
+				parseTagName(); // skip closing tag name
+				skipWhitespace();
+				pos++; // skip >
+				break;
+			}
+			const child = parseNode();
+			if(child) children.push(child);
+		}
+		return { tag: tagName, attributes, children };
+	}
+
+	/** Parses and returns the tag name at the current position */
+	function parseTagName() {
+		let name = '';
+		while (pos < xml.length && /[a-zA-Z0-9_:-]/.test(xml[pos])) name += xml[pos++];
+		return name;
+	}
+
+	/** Parses and returns an object containing all attributes at the current position */
+	function parseAttributes() {
+		const attrs: any = {};
+		while (pos < xml.length) {
+			skipWhitespace();
+			if (xml[pos] === '>' || xml[pos] === '/') break;
+			const name = parseTagName();
+			skipWhitespace();
+			if (xml[pos] === '=') {
+				pos++;
+				skipWhitespace();
+				const quote = xml[pos++];
+				let value = '';
+				while (xml[pos] !== quote) value += xml[pos++];
+				pos++; // skip closing quote
+				attrs[name] = escapeXml(value, true);
+			}
+		}
+		return attrs;
+	}
+
+	/** Parses and returns text content, or null if empty */
+	function parseText() {
+		let text = '';
+		while (pos < xml.length && xml[pos] !== '<') text += xml[pos++];
+		text = text.trim();
+		return text ? escapeXml(text, true) : null;
+	}
+
+	/** Skips over XML declaration (<?xml ... ?>) */
+	function parseDeclaration() {
+		while (xml[pos] !== '>') pos++;
+		pos++;
+	}
+
+	/** Skips over XML comments (<!-- ... -->) */
+	function parseComment() {
+		while (!(xml[pos] === '-' && xml[pos + 1] === '-' && xml[pos + 2] === '>')) pos++;
+		pos += 3;
+	}
+
+	/** Advances position past any whitespace characters */
+	function skipWhitespace() {
+		while (pos < xml.length && /\s/.test(xml[pos])) pos++;
+	}
+
+	return parseNode();
+}
+
+/**
+ * Converts a JavaScript object into an XML string.
+ * @param {Object} obj - Object with `tag`, `attributes`, and `children` properties, or a string
+ * @param {string} indent - Current indentation level (used internally for formatting)
+ * @returns {string} The formatted XML string
+ */
+export function toXml(obj: any, indent = '') {
+	if(typeof obj === 'string') return escapeXml(obj);
+	const { tag, attributes = {}, children = [] } = obj;
+	let xml = `${indent}<${tag}`;
+	for (const [key, value] of Object.entries(attributes))
+		xml += ` ${key}="${escapeXml(<any>value)}"`;
+	if (children.length === 0) {
+		xml += ' />';
+		return xml;
+	}
+	xml += '>';
+	const hasComplexChildren = children.some((c: any) => typeof c === 'object');
+	for (const child of children) {
+		if (hasComplexChildren) xml += '\n';
+		xml += toXml(child, hasComplexChildren ? indent + '  ' : '');
+	}
+	if(hasComplexChildren) xml += `\n${indent}`;
+	xml += `</${tag}>`;
+	return xml;
+}
+
+/**
+ * Escapes or unescapes XML special characters.
+ * @param {string} str - The string to process
+ * @param {boolean} decode - If true, decodes XML entities; if false, encodes special characters
+ * @returns {string} The processed string
+ */
+export function escapeXml(str: string, decode = false) {
+	if(decode) {
+		return str
+			.replace(/&lt;/g, '<')
+			.replace(/&gt;/g, '>')
+			.replace(/&quot;/g, '"')
+			.replace(/&apos;/g, "'")
+			.replace(/&amp;/g, '&');
+	}
+	return str
+		.replace(/&/g, '&amp;')
+		.replace(/</g, '&lt;')
+		.replace(/>/g, '&gt;')
+		.replace(/"/g, '&quot;')
+		.replace(/'/g, '&apos;');
+}

tests/xml.spec.ts

@@ -0,0 +1,170 @@
+import { toXml, fromXml } from '../src';
+
+describe('XML Parser', () => {
+	describe('fromXml', () => {
+		it('should parse simple tag', () => {
+			const xml = '<root></root>';
+			const result = fromXml(xml);
+			expect(result).toEqual({ tag: 'root', attributes: {}, children: [] });
+		});
+
+		it('should parse self-closing tag', () => {
+			const xml = '<item />';
+			const result = fromXml(xml);
+			expect(result).toEqual({ tag: 'item', attributes: {}, children: [] });
+		});
+
+		it('should parse tag with attributes', () => {
+			const xml = '<user id="1" name="someone" />';
+			const result = fromXml(xml);
+			expect(result).toEqual({
+				tag: 'user',
+				attributes: { id: '1', name: 'someone' },
+				children: []
+			});
+		});
+
+		it('should parse tag with text content', () => {
+			const xml = '<email>someone@example.com</email>';
+			const result = fromXml(xml);
+			expect(result).toEqual({
+				tag: 'email',
+				attributes: {},
+				children: ['someone@example.com']
+			});
+		});
+
+		it('should parse nested tags', () => {
+			const xml = '<root><child>text</child></root>';
+			const result = fromXml(xml);
+			expect(result).toEqual({
+				tag: 'root',
+				attributes: {},
+				children: [
+					{ tag: 'child', attributes: {}, children: ['text'] }
+				]
+			});
+		});
+
+		it('should parse multiple children', () => {
+			const xml = '<root><a /><b /><c /></root>';
+			const result = fromXml(xml);
+			expect(result.children.length).toBe(3);
+			expect(result.children[0]).toEqual({ tag: 'a', attributes: {}, children: [] });
+		});
+
+		it('should skip XML declaration', () => {
+			const xml = '<?xml version="1.0"?><root />';
+			const result = fromXml(xml);
+			expect(result.tag).toBe('root');
+		});
+
+		it('should skip comments', () => {
+			const xml = '<root><!-- comment --><child /></root>';
+			const result = fromXml(xml);
+			expect(result.children.length).toBe(1);
+			expect(result.children[0].tag).toBe('child');
+		});
+
+		it('should handle escaped characters', () => {
+			const xml = '<text>&lt;hello&gt; &amp; &quot;world&quot;</text>';
+			const result = fromXml(xml);
+			expect(result.children[0]).toBe('<hello> & "world"');
+		});
+
+		it('should parse complex nested structure', () => {
+			const xml = `
+        <root>
+          <user id="1" name="someone">
+            <email>someone@example.com</email>
+            <active />
+          </user>
+        </root>
+      `;
+			const result = fromXml(xml);
+			expect(result.tag).toBe('root');
+			expect(result.children[0].tag).toBe('user');
+			expect(result.children[0].attributes.name).toBe('someone');
+			expect(result.children[0].children.length).toBe(2);
+		});
+	});
+
+	describe('toXml', () => {
+		it('should encode simple tag', () => {
+			const obj = { tag: 'root', attributes: {}, children: [] };
+			expect(toXml(obj)).toBe('<root />');
+		});
+
+		it('should encode tag with attributes', () => {
+			const obj = { tag: 'user', attributes: { id: '1', name: 'someone' }, children: [] };
+			const result = toXml(obj);
+			expect(result).toContain('id="1"');
+			expect(result).toContain('name="someone"');
+		});
+
+		it('should encode tag with text content', () => {
+			const obj = { tag: 'email', attributes: {}, children: ['someone@example.com'] };
+			expect(toXml(obj)).toBe('<email>someone@example.com</email>');
+		});
+
+		it('should encode nested tags with indentation', () => {
+			const obj = {
+				tag: 'root',
+				attributes: {},
+				children: [
+					{ tag: 'child', attributes: {}, children: ['text'] }
+				]
+			};
+			const result = toXml(obj);
+			expect(result).toContain('<root>');
+			expect(result).toContain('  <child>');
+			expect(result).toContain('</root>');
+		});
+
+		it('should escape special characters', () => {
+			const obj = { tag: 'text', attributes: {}, children: ['<hello> & "world"'] };
+			const result = toXml(obj);
+			expect(result).toContain('&lt;hello&gt; &amp; &quot;world&quot;');
+		});
+
+		it('should escape attributes', () => {
+			const obj = { tag: 'node', attributes: { attr: 'a & b' }, children: [] };
+			const result = toXml(obj);
+			expect(result).toContain('attr="a &amp; b"');
+		});
+
+		it('should handle multiple children', () => {
+			const obj = {
+				tag: 'root',
+				attributes: {},
+				children: [
+					{ tag: 'a', attributes: {}, children: [] },
+					{ tag: 'b', attributes: {}, children: [] }
+				]
+			};
+			const result = toXml(obj);
+			expect(result).toContain('<a />');
+			expect(result).toContain('<b />');
+		});
+
+		it('should encode string directly', () => {
+			expect(toXml('hello')).toBe('hello');
+			expect(toXml('a & b')).toBe('a &amp; b');
+		});
+	});
+
+	describe('round-trip', () => {
+		it('should encode and decode to same structure', () => {
+			const obj = {
+				tag: 'root',
+				attributes: { id: '1' },
+				children: [
+					{ tag: 'child', attributes: {}, children: ['text'] }
+				]
+			};
+			const xml = toXml(obj);
+			const parsed = fromXml(xml);
+			expect(parsed).toEqual(obj);
+		});
+	});
+});