Method extractField

src/extraction/tree-sitter.ts:2052–2161

* Extract a class field declaration (e.g. Java field_declaration, C# field_declaration). * Extracts each declarator as a 'field' kind node inside the owning class.

(node: SyntaxNode)

   * Extracts each declarator as a 'field' kind node inside the owning class.
   */
  private extractField(node: SyntaxNode): void {
    if (!this.extractor) return;

    const docstring = getPrecedingDocstring(node, this.source);
    const visibility = this.extractor.getVisibility?.(node);
    const isStatic = this.extractor.isStatic?.(node) ?? false;

    // A class field that is actually a CONSTANT (Java `static final`, C# `const`
    // / `static readonly`) is extracted as `constant` kind, not `field`, so
    // value-reference edges treat it as a target (the gate accepts
    // constant/variable, not field). Scoped to languages whose `isConst`
    // predicate is field-shaped — other languages' fields stay `field`.
    const fieldKind: NodeKind =
      (this.language === 'java' || this.language === 'csharp') &&
      (this.extractor.isConst?.(node) ?? false)
        ? 'constant'
        : 'field';

    // Java field_declaration: "private final String name = value;" → variable_declarator(s) are direct children
    // C# field_declaration: wraps in variable_declaration → variable_declarator(s)
    let declarators = node.namedChildren.filter(
      c => c.type === 'variable_declarator'
    );
    // C#: look inside variable_declaration wrapper
    if (declarators.length === 0) {
      const varDecl = node.namedChildren.find(c => c.type === 'variable_declaration');
      if (varDecl) {
        declarators = varDecl.namedChildren.filter(c => c.type === 'variable_declarator');
      }
    }

    // PHP property_declaration: property_element → variable_name → name
    if (declarators.length === 0) {
      const propElements = node.namedChildren.filter(c => c.type === 'property_element');
      if (propElements.length > 0) {
        // Get type annotation if present (e.g. "string", "int", "?Foo")
        const typeNode = node.namedChildren.find(
          c => c.type !== 'visibility_modifier' && c.type !== 'static_modifier'
            && c.type !== 'readonly_modifier' && c.type !== 'property_element'
            && c.type !== 'var_modifier'
        );
        const typeText = typeNode ? getNodeText(typeNode, this.source) : undefined;

        for (const elem of propElements) {
          const varName = elem.namedChildren.find(c => c.type === 'variable_name');
          const nameNode = varName?.namedChildren.find(c => c.type === 'name');
          if (!nameNode) continue;
          const name = getNodeText(nameNode, this.source);
          const signature = typeText ? `${typeText} $${name}` : `$${name}`;
          this.createNode('field', name, elem, {
            docstring,
            signature,
            visibility,
            isStatic,
          });
        }
        return;
      }