1 files changed, 141 insertions, 0 deletions
diff --git a/src/lib/vendor/rss/xml.ts b/src/lib/vendor/rss/xml.ts
new file mode 100644
index 0000000..30618c0
--- /dev/null
+++ b/src/lib/vendor/rss/xml.ts
@@ -0,0 +1,141 @@
+// String methods based on https://github.com/cburgmer/xmlserializer/blob/master/xmlserializer.js
+
+export const removeInvalidXMLCharacters = (content: string) =>
+  // See http://www.w3.org/TR/xml/#NT-Char for valid XML 1.0 characters
+  content.replace(/[\x00-\x08\x0B\x0C\x0E-\x1F]/g, '');
+
+export const serializeAttributeValue = (value: string) => value
+  .replace(/&/g, '&amp;')
+  .replace(/</g, '&lt;')
+  .replace(/>/g, '&gt;')
+  .replace(/"/g, '&quot;')
+  .replace(/'/g, '&apos;');
+
+export const serializeTextContent = (content: string) => content
+  .replace(/&/g, '&amp;')
+  .replace(/</g, '&lt;')
+  .replace(/>/g, '&gt;');
+
+export const serializeAttribute = (name: string, value: string) => name + '="' + serializeAttributeValue(value) + '"';
+export const indent = (text: string, size: number) => text.split('\n').map(line => `${' '.repeat(size)}${line}`).join('\n')
+
+export enum XMLTagType {
+  DocumentRoot = '#document',
+  XMLDeclaration = '#declaration',
+  Element = '#element',
+  Text = '#text',
+  Comment = '#comment',
+  CData = '#cdata-section',
+}
+export abstract class BaseXMLTag {
+  public abstract readonly tagType: XMLTagType;
+  public abstract toString(): string;
+}
+export abstract class XMLTagWithAttributes extends BaseXMLTag {
+  public attributes = new Map<string, string>();
+  protected get attributeString() {
+    let str = '';
+    for (const segment of this.attributes.entries().map(([k, v]) => serializeAttribute(k, v))) {
+      if (str && str.length + segment.length > 60)
+        str += `\n${indent(segment, 2)}`;
+      else
+        str += ` ${segment}`;
+    }
+    return str;
+  }
+  public attribute(name: string, value: string) {
+    this.attributes.set(name, value);
+    return this;
+  }
+  public getAttribute(name: string) {
+    return this.attributes.get(name);
+  }
+}
+export abstract class XMLTagWithChildrenAndAttributes extends XMLTagWithAttributes {
+  public children: BaseXMLTag[] = [];
+  protected get contentString() {
+    return this.children.map(v => v.toString()).join('\n');
+  }
+  public child(...children: BaseXMLTag[]) {
+    this.children.push(...children);
+    return this;
+  }
+}
+export class XMLDocumentRoot extends XMLTagWithChildrenAndAttributes {
+  public readonly tagType = XMLTagType.DocumentRoot as const;
+  public toString(): string {
+    return removeInvalidXMLCharacters(this.contentString);
+  }
+}
+export class XMLDeclaration extends XMLTagWithChildrenAndAttributes {
+  public readonly tagType = XMLTagType.XMLDeclaration as const;
+  public toString(): string {
+    return `<?xml${this.attributeString} ?>`;
+  }
+  public version(version = "1.0") {
+    return this.attribute("version", version)
+  }
+  public encoding(encoding = "UTF-8") {
+    return this.attribute("encoding", encoding);
+  }
+};
+export class XMLElement extends XMLTagWithChildrenAndAttributes {
+  public readonly tagType = XMLTagType.Element as const;
+  public constructor(public tagName: string) { super() }
+  public toString(): string {
+    return `<${this.tagName}${this.attributeString}${this.children.length ? `>
+${indent(this.contentString, 2)}
+</${this.tagName}>` : ' />'}`
+  }
+}
+export class XMLRootElement extends XMLElement {
+  /**
+   * @param subns Leave as empty string for root namespace
+   */
+  public xmlns(subns: string, value: string) {
+    this.attribute(`xmlns${subns ? `:${subns}` : ''}`, value)
+    return this;
+  }
+}
+export class XMLText extends BaseXMLTag {
+  public tagType = XMLTagType.Text as const;
+  public constructor(public text: string) { super() }
+  public toString(): string {
+    return serializeTextContent(this.text);
+  }
+}
+export class XMLComment extends BaseXMLTag {
+  public tagType = XMLTagType.Comment as const;
+  public constructor(
+    public text: string,
+    /** Set to 0 for no wrapping at all */
+    public wrapAt = 70,
+    public addSpacesAroundCommentTags = true
+  ) { super() }
+  public toString(): string {
+    let text = this.text;
+    if (this.wrapAt) {
+      const lines = text.split('\n')
+      const newLines = [] as string[]
+      if (lines.length === 1 && lines[0].length < this.wrapAt) {
+        if (this.addSpacesAroundCommentTags)
+          newLines[0] = ` ${text} `
+      } else
+        for (let line of lines)
+          while (line.length) {
+            newLines.push(line.substring(0, this.wrapAt))
+            line = line.substring(this.wrapAt)
+          }
+    } else if (this.addSpacesAroundCommentTags) this.text = ` ${this.text} `
+    return `<!--${text
+      .replace(/-/g, '&#45;')}-->`;
+  }
+}
+export class XMLCData extends BaseXMLTag {
+  public tagType = XMLTagType.CData as const;
+  public constructor(public content: string) { super() }
+  public toString(): string {
+    return `<![CDATA[${this.content.replace(/\]\]>/gu, ']]]]><![CDATA[>')}]]>`;
+  }
+}
+export type XMLTag = XMLDocumentRoot | XMLDeclaration | XMLElement | XMLComment;