Method resolve_extract_function

src/code_actions/extract_function.rs:2141–2339

Resolve a deferred "Extract Function/Method" code action. This is **Phase 2** of the two-phase code-action model. Phase 1 (`collect_extract_function_actions`) already validated the selection and emitted a lightweight `CodeAction` with a title but no edit. Here we re-run the full extraction logic from the selection range stored in `data` and produce the workspace edit.

(
        &self,
        data: &CodeActionData,
        content: &str,
    )

    /// but no edit.  Here we re-run the full extraction logic from the
    /// selection range stored in `data` and produce the workspace edit.
    pub(crate) fn resolve_extract_function(
        &self,
        data: &CodeActionData,
        content: &str,
    ) -> Option<WorkspaceEdit> {
        let uri = &data.uri;
        let range = &data.range;

        // ── Re-validate the selection (content may have changed) ────
        let start_offset = position_to_byte_offset(content, range.start);
        let end_offset = position_to_byte_offset(content, range.end);

        let (start, end) = trim_selection(content, start_offset, end_offset)?;

        if !selection_covers_complete_statements(content, start, end) {
            return None;
        }

        // ── Scope map & classification ──────────────────────────────
        let scope_map = build_scope_map(content, start as u32);
        let classification = scope_map.classify_range(start as u32, end as u32);

        let return_value_count = classification.return_values.len();
        let return_strategy = analyse_returns(content, start, end, return_value_count);

        if return_strategy == ReturnStrategy::Unsafe {
            return None;
        }

        let uses_this = if scope_map.has_this_or_self {
            classification.uses_this
        } else {
            false
        };

        if scope_map.uses_reference_params() && !classification.reference_writes.is_empty() {
            return None;
        }

        if classification.return_values.len() > 4 {
            return None;
        }

        // ── Enclosing context ───────────────────────────────────────
        let enclosing = find_enclosing_context(content, start as u32, uses_this)?;

        // ── Naming ──────────────────────────────────────────────────
        let body_line_start_for_naming = find_line_start(content, start);
        let body_text_for_naming = &content[body_line_start_for_naming..end];
        let pre_trailing_return_type = if matches!(return_strategy, ReturnStrategy::TrailingReturn)
        {
            resolve_enclosing_return_type(content, start as u32)
        } else {
            PhpType::untyped()
        };
        let naming_ctx = NamingContext {
            enclosing_name: &enclosing.enclosing_name,
            return_strategy: &return_strategy,