Viewing file:  check_nesting.cpp (10.18 KB) -rw-r--r--
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#include "sass.hpp"
#include <vector>
#include "check_nesting.hpp"
namespace Sass {
CheckNesting::CheckNesting()
: parents(std::vector<Statement_Ptr>()),
traces(std::vector<Backtrace>()),
parent(0), current_mixin_definition(0)
{ }
void error(AST_Node_Ptr node, Backtraces traces, std::string msg) {
traces.push_back(Backtrace(node->pstate()));
throw Exception::InvalidSass(node->pstate(), traces, msg);
}
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);
Block_Ptr ret = ar->block();
if (ret != NULL) {
for (auto n : ret->elements()) {
n->perform(this);
}
}
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 (Trace_Ptr trace = Cast<Trace>(parent)) {
if (trace->type() == 'i') {
this->traces.push_back(Backtrace(trace->pstate()));
}
}
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();
if (Trace_Ptr trace = Cast<Trace>(parent)) {
if (trace->type() == 'i') {
this->traces.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::operator()(If_Ptr i)
{
this->visit_children(i);
if (Block_Ptr b = Cast<Block>(i->alternative())) {
for (auto n : b->elements()) n->perform(this);
}
return i;
}
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, node); }
if (is_charset(node))
{ this->invalid_charset_parent(this->parent, node); }
if (Cast<Extension>(node))
{ this->invalid_extend_parent(this->parent, node); }
// if (Cast<Import>(node))
// { this->invalid_import_parent(this->parent); }
if (this->is_mixin(node))
{ this->invalid_mixin_definition_parent(this->parent, node); }
if (this->is_function(node))
{ this->invalid_function_parent(this->parent, node); }
if (this->is_function(this->parent))
{ this->invalid_function_child(node); }
if (Declaration_Ptr d = Cast<Declaration>(node))
{
this->invalid_prop_parent(this->parent, node);
this->invalid_value_child(d->value());
}
if (Cast<Declaration>(this->parent))
{ this->invalid_prop_child(node); }
if (Cast<Return>(node))
{ this->invalid_return_parent(this->parent, node); }
return true;
}
void CheckNesting::invalid_content_parent(Statement_Ptr parent, AST_Node_Ptr node)
{
if (!this->current_mixin_definition) {
error(node, traces, "@content may only be used within a mixin.");
}
}
void CheckNesting::invalid_charset_parent(Statement_Ptr parent, AST_Node_Ptr node)
{
if (!(
is_root_node(parent)
)) {
error(node, traces, "@charset may only be used at the root of a document.");
}
}
void CheckNesting::invalid_extend_parent(Statement_Ptr parent, AST_Node_Ptr node)
{
if (!(
Cast<Ruleset>(parent) ||
Cast<Mixin_Call>(parent) ||
is_mixin(parent)
)) {
error(node, traces, "Extend directives may only be used within rules.");
}
}
// void CheckNesting::invalid_import_parent(Statement_Ptr parent, AST_Node_Ptr node)
// {
// 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)
// ) {
// error(node, traces, "Import directives may not be defined within control directives or other mixins.");
// }
// }
// if (this->is_root_node(parent)) {
// return;
// }
// if (false/*n.css_import?*/) {
// error(node, traces, "CSS import directives may only be used at the root of a document.");
// }
// }
void CheckNesting::invalid_mixin_definition_parent(Statement_Ptr parent, AST_Node_Ptr node)
{
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)
) {
error(node, traces, "Mixins may not be defined within control directives or other mixins.");
}
}
}
void CheckNesting::invalid_function_parent(Statement_Ptr parent, AST_Node_Ptr node)
{
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)
) {
error(node, traces, "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)
)) {
error(child, traces, "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)
)) {
error(child, traces, "Illegal nesting: Only properties may be nested beneath properties.");
}
}
void CheckNesting::invalid_prop_parent(Statement_Ptr parent, AST_Node_Ptr node)
{
if (!(
is_mixin(parent) ||
is_directive_node(parent) ||
Cast<Ruleset>(parent) ||
Cast<Keyframe_Rule>(parent) ||
Cast<Declaration>(parent) ||
Cast<Mixin_Call>(parent)
)) {
error(node, traces, "Properties are only allowed within rules, directives, mixin includes, or other properties.");
}
}
void CheckNesting::invalid_value_child(AST_Node_Ptr d)
{
if (Map_Ptr m = Cast<Map>(d)) {
traces.push_back(Backtrace(m->pstate()));
throw Exception::InvalidValue(traces, *m);
}
if (Number_Ptr n = Cast<Number>(d)) {
if (!n->is_valid_css_unit()) {
traces.push_back(Backtrace(n->pstate()));
throw Exception::InvalidValue(traces, *n);
}
}
// error(dbg + " isn't a valid CSS value.", m->pstate(),);
}
void CheckNesting::invalid_return_parent(Statement_Ptr parent, AST_Node_Ptr node)
{
if (!this->is_function(parent)) {
error(node, traces, "@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);
}
}
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