| 1 | // pgen2.cc
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| 2 |
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| 3 | #include "pgen2.h"
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| 4 |
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| 5 | #include <vector>
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| 6 |
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| 7 | namespace pnode {
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| 8 |
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| 9 | PNode::PNode(int typ, syntax_asdl::Token* tok, List<PNode*>*)
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| 10 | : typ(typ), tok(tok), children() {
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| 11 | }
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| 12 |
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| 13 | void PNode::AddChild(PNode* node) {
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| 14 | children.push_back(node);
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| 15 | }
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| 16 |
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| 17 | PNode* PNode::GetChild(int i) {
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| 18 | int j = i;
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| 19 | if (j < 0) {
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| 20 | j += NumChildren();
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| 21 | }
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| 22 | return children[j];
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| 23 | }
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| 24 |
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| 25 | int PNode::NumChildren() {
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| 26 | return children.size();
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| 27 | }
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| 28 |
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| 29 | // TODO: It would be nicer to reuse the std::deque arena_ throughout the whole
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| 30 | // program. Rather than new/delete for parsing each YSH expression.
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| 31 | PNodeAllocator::PNodeAllocator() : arena_(new std::deque<PNode>()) {
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| 32 | }
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| 33 |
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| 34 | PNode* PNodeAllocator::NewPNode(int typ, syntax_asdl::Token* tok) {
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| 35 | arena_->emplace_back(typ, tok, nullptr);
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| 36 | return &(arena_->back());
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| 37 | }
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| 38 |
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| 39 | void PNodeAllocator::Clear() {
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| 40 | delete arena_;
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| 41 | arena_ = nullptr;
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| 42 | }
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| 43 |
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| 44 | } // namespace pnode
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