Method onAttribute

xml/_parser.ts:230–302

(name: string, value: string)

  }

  onAttribute(name: string, value: string): void {
    if (this.#hasPendingElement) {
      // Validate QName syntax for attribute name (Namespaces §3)
      const colonIndex = name.indexOf(":");
      const qnameError = validateQName(name, colonIndex);
      if (qnameError) {
        throw new XmlSyntaxError(
          `Invalid attribute name '${name}': ${qnameError}`,
          {
            line: this.#pendingLine,
            column: this.#pendingColumn,
            offset: this.#pendingOffset,
          },
        );
      }

      // Validate namespace binding if this is an xmlns attribute
      if (name === "xmlns" || name.startsWith("xmlns:")) {
        // Normalize the attribute value for namespace URI
        const normalizedValue = normalizeAttributeValue(value, this.#xml11);
        const nsError = validateNamespaceBinding(
          name,
          normalizedValue,
          this.#xml11,
        );
        if (nsError) {
          throw new XmlSyntaxError(
            nsError,
            {
              line: this.#pendingLine,
              column: this.#pendingColumn,
              offset: this.#pendingOffset,
            },
          );
        }
        // Track xmlns:prefix declarations
        if (name.startsWith("xmlns:")) {
          const prefix = name.slice(6); // After "xmlns:"
          // Lazy init namespace bindings
          if (!this.#nsBindings) {
            this.#nsBindings = new Map([["xml", XML_NAMESPACE]]);
          }
          // Save previous binding for restoration
          this.#pendingNsBindings.push([prefix, this.#nsBindings.get(prefix)]);
          this.#nsBindings.set(prefix, normalizedValue);
        }
      }

      if (this.#attrIterator.count >= this.#maxAttributes) {
        throw new XmlSyntaxError(
          `Attribute count exceeds limit of ${this.#maxAttributes}`,
          {
            line: this.#pendingLine,
            column: this.#pendingColumn,
            offset: this.#pendingOffset,
          },
        );
      }