#include "sass.hpp"
#include <vector>
#include "check_nesting.hpp"
namespace Sass {
CheckNesting::CheckNesting()
: parents(std::vector<Statement_Ptr>()),
parent(0),
current_mixin_definition(0)
{ }
Statement_Ptr CheckNesting::visit_children(Statement_Ptr parent)
{
Statement_Ptr old_parent = this->parent;
if (At_Root_Block_Ptr root = Cast<At_Root_Block>(parent)) {
std::vector<Statement_Ptr> old_parents = this->parents;
std::vector<Statement_Ptr> new_parents;
for (size_t i = 0, L = this->parents.size(); i < L; i++) {
Statement_Ptr p = this->parents.at(i);
if (!root->exclude_node(p)) {
new_parents.push_back(p);
}
}
this->parents = new_parents;
for (size_t i = this->parents.size(); i > 0; i--) {
Statement_Ptr p = 0;
Statement_Ptr gp = 0;
if (i > 0) p = this->parents.at(i - 1);
if (i > 1) gp = this->parents.at(i - 2);
if (!this->is_transparent_parent(p, gp)) {
this->parent = p;
break;
}
}
At_Root_Block_Ptr ar = Cast<At_Root_Block>(parent);
Statement_Ptr ret = this->visit_children(ar->block());
this->parent = old_parent;
this->parents = old_parents;
return ret;
}
if (!this->is_transparent_parent(parent, old_parent)) {
this->parent = parent;
}
this->parents.push_back(parent);
Block_Ptr b = Cast<Block>(parent);
if (!b) {
if (Has_Block_Ptr bb = Cast<Has_Block>(parent)) {
b = bb->block();
}
}
if (b) {
for (auto n : b->elements()) {
n->perform(this);
}
}
this->parent = old_parent;
this->parents.pop_back();
return b;
}
Statement_Ptr CheckNesting::operator()(Block_Ptr b)
{
return this->visit_children(b);
}
Statement_Ptr CheckNesting::operator()(Definition_Ptr n)
{
if (!this->should_visit(n)) return NULL;
if (!is_mixin(n)) {
visit_children(n);
return n;
}
Definition_Ptr old_mixin_definition = this->current_mixin_definition;
this->current_mixin_definition = n;
visit_children(n);
this->current_mixin_definition = old_mixin_definition;
return n;
}
Statement_Ptr CheckNesting::fallback_impl(Statement_Ptr s)
{
Block_Ptr b1 = Cast<Block>(s);
Has_Block_Ptr b2 = Cast<Has_Block>(s);
return b1 || b2 ? visit_children(s) : s;
}
bool CheckNesting::should_visit(Statement_Ptr node)
{
if (!this->parent) return true;
if (Cast<Content>(node))
{ this->invalid_content_parent(this->parent); }
if (is_charset(node))
{ this->invalid_charset_parent(this->parent); }
if (Cast<Extension>(node))
{ this->invalid_extend_parent(this->parent); }
// if (Cast<Import>(node))
// { this->invalid_import_parent(this->parent); }
if (this->is_mixin(node))
{ this->invalid_mixin_definition_parent(this->parent); }
if (this->is_function(node))
{ this->invalid_function_parent(this->parent); }
if (this->is_function(this->parent))
{ this->invalid_function_child(node); }
if (Cast<Declaration>(node))
{ this->invalid_prop_parent(this->parent); }
if (Cast<Declaration>(this->parent))
{ this->invalid_prop_child(node); }
if (Cast<Return>(node))
{ this->invalid_return_parent(this->parent); }
return true;
}
void CheckNesting::invalid_content_parent(Statement_Ptr parent)
{
if (!this->current_mixin_definition) {
throw Exception::InvalidSass(
parent->pstate(),
"@content may only be used within a mixin."
);
}
}
void CheckNesting::invalid_charset_parent(Statement_Ptr parent)
{
if (!(
is_root_node(parent)
)) {
throw Exception::InvalidSass(
parent->pstate(),
"@charset may only be used at the root of a document."
);
}
}
void CheckNesting::invalid_extend_parent(Statement_Ptr parent)
{
if (!(
Cast<Ruleset>(parent) ||
Cast<Mixin_Call>(parent) ||
is_mixin(parent)
)) {
throw Exception::InvalidSass(
parent->pstate(),
"Extend directives may only be used within rules."
);
}
}
// void CheckNesting::invalid_import_parent(Statement_Ptr parent)
// {
// for (auto pp : this->parents) {
// if (
// Cast<Each>(pp) ||
// Cast<For>(pp) ||
// Cast<If>(pp) ||
// Cast<While>(pp) ||
// Cast<Trace>(pp) ||
// Cast<Mixin_Call>(pp) ||
// is_mixin(pp)
// ) {
// throw Exception::InvalidSass(
// parent->pstate(),
// "Import directives may not be defined within control directives or other mixins."
// );
// }
// }
// if (this->is_root_node(parent)) {
// return;
// }
// if (false/*n.css_import?*/) {
// throw Exception::InvalidSass(
// parent->pstate(),
// "CSS import directives may only be used at the root of a document."
// );
// }
// }
void CheckNesting::invalid_mixin_definition_parent(Statement_Ptr parent)
{
for (Statement_Ptr pp : this->parents) {
if (
Cast<Each>(pp) ||
Cast<For>(pp) ||
Cast<If>(pp) ||
Cast<While>(pp) ||
Cast<Trace>(pp) ||
Cast<Mixin_Call>(pp) ||
is_mixin(pp)
) {
throw Exception::InvalidSass(
parent->pstate(),
"Mixins may not be defined within control directives or other mixins."
);
}
}
}
void CheckNesting::invalid_function_parent(Statement_Ptr parent)
{
for (Statement_Ptr pp : this->parents) {
if (
Cast<Each>(pp) ||
Cast<For>(pp) ||
Cast<If>(pp) ||
Cast<While>(pp) ||
Cast<Trace>(pp) ||
Cast<Mixin_Call>(pp) ||
is_mixin(pp)
) {
throw Exception::InvalidSass(
parent->pstate(),
"Functions may not be defined within control directives or other mixins."
);
}
}
}
void CheckNesting::invalid_function_child(Statement_Ptr child)
{
if (!(
Cast<Each>(child) ||
Cast<For>(child) ||
Cast<If>(child) ||
Cast<While>(child) ||
Cast<Trace>(child) ||
Cast<Comment>(child) ||
Cast<Debug>(child) ||
Cast<Return>(child) ||
Cast<Variable>(child) ||
// Ruby Sass doesn't distinguish variables and assignments
Cast<Assignment>(child) ||
Cast<Warning>(child) ||
Cast<Error>(child)
)) {
throw Exception::InvalidSass(
child->pstate(),
"Functions can only contain variable declarations and control directives."
);
}
}
void CheckNesting::invalid_prop_child(Statement_Ptr child)
{
if (!(
Cast<Each>(child) ||
Cast<For>(child) ||
Cast<If>(child) ||
Cast<While>(child) ||
Cast<Trace>(child) ||
Cast<Comment>(child) ||
Cast<Declaration>(child) ||
Cast<Mixin_Call>(child)
)) {
throw Exception::InvalidSass(
child->pstate(),
"Illegal nesting: Only properties may be nested beneath properties."
);
}
}
void CheckNesting::invalid_prop_parent(Statement_Ptr parent)
{
if (!(
is_mixin(parent) ||
is_directive_node(parent) ||
Cast<Ruleset>(parent) ||
Cast<Keyframe_Rule>(parent) ||
Cast<Declaration>(parent) ||
Cast<Mixin_Call>(parent)
)) {
throw Exception::InvalidSass(
parent->pstate(),
"Properties are only allowed within rules, directives, mixin includes, or other properties."
);
}
}
void CheckNesting::invalid_return_parent(Statement_Ptr parent)
{
if (!this->is_function(parent)) {
throw Exception::InvalidSass(
parent->pstate(),
"@return may only be used within a function."
);
}
}
bool CheckNesting::is_transparent_parent(Statement_Ptr parent, Statement_Ptr grandparent)
{
bool parent_bubbles = parent && parent->bubbles();
bool valid_bubble_node = parent_bubbles &&
!is_root_node(grandparent) &&
!is_at_root_node(grandparent);
return Cast<Import>(parent) ||
Cast<Each>(parent) ||
Cast<For>(parent) ||
Cast<If>(parent) ||
Cast<While>(parent) ||
Cast<Trace>(parent) ||
valid_bubble_node;
}
bool CheckNesting::is_charset(Statement_Ptr n)
{
Directive_Ptr d = Cast<Directive>(n);
return d && d->keyword() == "charset";
}
bool CheckNesting::is_mixin(Statement_Ptr n)
{
Definition_Ptr def = Cast<Definition>(n);
return def && def->type() == Definition::MIXIN;
}
bool CheckNesting::is_function(Statement_Ptr n)
{
Definition_Ptr def = Cast<Definition>(n);
return def && def->type() == Definition::FUNCTION;
}
bool CheckNesting::is_root_node(Statement_Ptr n)
{
if (Cast<Ruleset>(n)) return false;
Block_Ptr b = Cast<Block>(n);
return b && b->is_root();
}
bool CheckNesting::is_at_root_node(Statement_Ptr n)
{
return Cast<At_Root_Block>(n) != NULL;
}
bool CheckNesting::is_directive_node(Statement_Ptr n)
{
return Cast<Directive>(n) ||
Cast<Import>(n) ||
Cast<Media_Block>(n) ||
Cast<Supports_Block>(n);
}
}