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//! AST traversal functions for template transformation.
use crate::steps::v_slot::{get_slot_name, get_slot_prop_names, get_slot_props_string};
use crate::{
ElementNode, ElementType, ExpressionNode, ForNode, IfBranchNode, PropNode, RuntimeHelper,
TemplateChildNode,
};
use vize_carton::profile;
use super::element::{transform_element, transform_interpolation};
use super::structural::{
StructuralDirectiveKind, take_structural_directive, transform_v_for,
transform_v_if_with_directive,
};
use super::{ExitFns, ParentNode, TransformContext};
fn enter_v_slot_scope_if_needed<'a>(ctx: &mut TransformContext<'a>, el: &ElementNode<'a>) -> bool {
if el.children.is_empty()
|| (el.tag_type != ElementType::Component && el.tag.as_str() != "template")
{
return false;
}
for prop in el.props.iter() {
if let PropNode::Directive(dir) = prop {
if dir.name != "slot" {
continue;
}
let prop_names = get_slot_prop_names(dir);
if prop_names.is_empty() {
return false;
}
let slot_name = get_slot_name(dir);
let props_pattern = get_slot_props_string(dir);
ctx.enter_v_slot_scope(
slot_name.as_str(),
props_pattern.as_ref().map(|pattern| pattern.as_str()),
&prop_names,
dir.loc.start.offset,
el.loc.end.offset,
);
return true;
}
}
false
}
/// Traverse children of a parent node
pub fn traverse_children<'a>(ctx: &mut TransformContext<'a>, parent: ParentNode<'a>) {
let children = parent.children_mut();
let mut i = 0;
while i < children.len() {
ctx.grandparent = ctx.parent;
ctx.parent = Some(parent);
ctx.child_index = i;
ctx.reset_node_removed();
traverse_node(ctx, &mut children[i]);
if ctx.was_node_removed() {
// Node was removed, don't increment i
} else {
i += 1;
}
}
}
/// Traverse a single node
pub fn traverse_node<'a>(ctx: &mut TransformContext<'a>, node: &mut TemplateChildNode<'a>) {
ctx.current_node = Some(node as *mut _);
// Collect exit functions from transforms
let mut exit_fns = ExitFns::new();
// Apply node transforms based on node type
match node {
TemplateChildNode::Element(el) => {
// Check for structural directives first
let structural_result = profile!(
"atelier.transform.check_structural",
take_structural_directive(el)
);
if let Some((directive_kind, exp, directive_loc)) = structural_result {
// Handle the structural directive
match directive_kind {
StructuralDirectiveKind::If => {
if let Some(exits) = profile!(
"atelier.transform.v_if",
transform_v_if_with_directive(
ctx,
directive_kind,
exp.as_ref(),
&directive_loc,
true
)
) {
exit_fns.extend(exits);
}
}
StructuralDirectiveKind::ElseIf | StructuralDirectiveKind::Else => {
if let Some(exits) = profile!(
"atelier.transform.v_if",
transform_v_if_with_directive(
ctx,
directive_kind,
exp.as_ref(),
&directive_loc,
false
)
) {
exit_fns.extend(exits);
}
}
StructuralDirectiveKind::For => {
if let Some(exits) = profile!(
"atelier.transform.v_for",
transform_v_for(ctx, exp.as_ref())
) {
exit_fns.extend(exits);
}
}
}
// If node was replaced (e.g., by v-if transform), we need to traverse the new node
if let Some(current_ptr) = ctx.current_node {
// SAFETY: `ctx.current_node` is written immediately before
// transforms run and points at the child slot currently owned
// by the traversal loop. Structural transforms may replace
// that slot, but they do not free the bump-allocated storage
// or retain another mutable reference to it. We reborrow here
// only after the transform call returns so we can inspect the
// replacement without cloning the AST node.
let current = unsafe { &mut *current_ptr };
match current {
TemplateChildNode::If(if_node) => {
// Traverse if branches that were just created
for i in 0..if_node.branches.len() {
let branch_ptr = &mut if_node.branches[i] as *mut IfBranchNode<'a>;
profile!(
"atelier.transform.traverse_v_if_branch",
traverse_children(ctx, ParentNode::IfBranch(branch_ptr))
);
}
// Run exit functions and return early
for exit_fn in exit_fns.into_iter().rev() {
profile!("atelier.transform.exit_fn", exit_fn(ctx));
}
return;
}
TemplateChildNode::For(for_node) => {
// Enter v-for scope with aliases
let value = for_node.value_alias.as_ref().and_then(|e| {
if let ExpressionNode::Simple(exp) = e {
Some(exp.content.as_str())
} else {
None
}
});
let key = for_node.key_alias.as_ref().and_then(|e| {
if let ExpressionNode::Simple(exp) = e {
Some(exp.content.as_str())
} else {
None
}
});
let index = for_node.object_index_alias.as_ref().and_then(|e| {
if let ExpressionNode::Simple(exp) = e {
Some(exp.content.as_str())
} else {
None
}
});
let source = match &for_node.source {
ExpressionNode::Simple(exp) => exp.content.as_str(),
ExpressionNode::Compound(c) => c.loc.source.as_str(),
};
ctx.enter_v_for_scope(value, key, index, source);
// Traverse for children
let for_ptr = for_node.as_mut() as *mut ForNode<'a>;
profile!(
"atelier.transform.traverse_v_for_children",
traverse_children(ctx, ParentNode::For(for_ptr))
);
// Exit v-for scope
ctx.exit_scope();
// Add helpers
ctx.helper(RuntimeHelper::RenderList);
ctx.helper(RuntimeHelper::Fragment);
// Run exit functions and return early
for exit_fn in exit_fns.into_iter().rev() {
profile!("atelier.transform.exit_fn", exit_fn(ctx));
}
return;
}
TemplateChildNode::Element(el) => {
// Still an element, process it
if let Some(exits) =
profile!("atelier.transform.element", transform_element(ctx, el))
{
exit_fns.extend(exits);
}
}
_ => {}
}
} else {
// Node was removed, return early
return;
}
} else {
// No structural directive, process element normally
if let Some(exits) =
profile!("atelier.transform.element", transform_element(ctx, el))
{
exit_fns.extend(exits);
}
}
}
TemplateChildNode::Interpolation(interp) => {
profile!(
"atelier.transform.interpolation",
transform_interpolation(ctx, interp)
);
}
TemplateChildNode::Text(_) => {
ctx.helper(RuntimeHelper::CreateText);
}
TemplateChildNode::Comment(_) => {
ctx.helper(RuntimeHelper::CreateComment);
}
TemplateChildNode::If(if_node) => {
// Traverse if branches
for i in 0..if_node.branches.len() {
let branch_ptr = &mut if_node.branches[i] as *mut IfBranchNode<'a>;
profile!(
"atelier.transform.traverse_v_if_branch",
traverse_children(ctx, ParentNode::IfBranch(branch_ptr))
);
}
}
TemplateChildNode::For(for_node) => {
// Enter v-for scope with aliases
let value = for_node.value_alias.as_ref().and_then(|e| {
if let ExpressionNode::Simple(exp) = e {
Some(exp.content.as_str())
} else {
None
}
});
let key = for_node.key_alias.as_ref().and_then(|e| {
if let ExpressionNode::Simple(exp) = e {
Some(exp.content.as_str())
} else {
None
}
});
let index = for_node.object_index_alias.as_ref().and_then(|e| {
if let ExpressionNode::Simple(exp) = e {
Some(exp.content.as_str())
} else {
None
}
});
let source = match &for_node.source {
ExpressionNode::Simple(exp) => exp.content.as_str(),
ExpressionNode::Compound(c) => c.loc.source.as_str(),
};
ctx.enter_v_for_scope(value, key, index, source);
// Traverse for children
let for_ptr = for_node.as_mut() as *mut ForNode<'a>;
profile!(
"atelier.transform.traverse_v_for_children",
traverse_children(ctx, ParentNode::For(for_ptr))
);
// Exit v-for scope
ctx.exit_scope();
// Add helpers
ctx.helper(RuntimeHelper::RenderList);
ctx.helper(RuntimeHelper::Fragment);
}
_ => {}
}
// Traverse children for element nodes
if let TemplateChildNode::Element(el) = node
&& !el.children.is_empty()
{
let entered_slot_scope = enter_v_slot_scope_if_needed(ctx, el);
let el_ptr = el.as_mut() as *mut ElementNode<'a>;
profile!(
"atelier.transform.traverse_element_children",
traverse_children(ctx, ParentNode::Element(el_ptr))
);
if entered_slot_scope {
ctx.exit_scope();
}
}
// Call exit functions in reverse order
ctx.current_node = Some(node as *mut _);
for exit_fn in exit_fns.into_iter().rev() {
profile!("atelier.transform.exit_fn", exit_fn(ctx));
}
}