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