1 files changed, 463 insertions, 0 deletions
diff --git a/deps/v8/third_party/antlr4/runtime/Cpp/runtime/src/TokenStreamRewriter.cpp b/deps/v8/third_party/antlr4/runtime/Cpp/runtime/src/TokenStreamRewriter.cpp
new file mode 100644
index 0000000000..188d04cf42
--- /dev/null
+++ b/deps/v8/third_party/antlr4/runtime/Cpp/runtime/src/TokenStreamRewriter.cpp
@@ -0,0 +1,463 @@
+/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
+ * Use of this file is governed by the BSD 3-clause license that
+ * can be found in the LICENSE.txt file in the project root.
+ */
+
+#include "Exceptions.h"
+#include "Token.h"
+#include "TokenStream.h"
+#include "misc/Interval.h"
+
+#include "TokenStreamRewriter.h"
+
+using namespace antlr4;
+
+using antlr4::misc::Interval;
+
+TokenStreamRewriter::RewriteOperation::RewriteOperation(
+    TokenStreamRewriter* outerInstance_, size_t index_)
+    : outerInstance(outerInstance_) {
+  InitializeInstanceFields();
+  this->index = index_;
+}
+
+TokenStreamRewriter::RewriteOperation::RewriteOperation(
+    TokenStreamRewriter* outerInstance_, size_t index_,
+    const std::string& text_)
+    : outerInstance(outerInstance_) {
+  InitializeInstanceFields();
+  this->index = index_;
+  this->text = text_;
+}
+
+TokenStreamRewriter::RewriteOperation::~RewriteOperation() {}
+
+size_t TokenStreamRewriter::RewriteOperation::execute(std::string* /*buf*/) {
+  return index;
+}
+
+std::string TokenStreamRewriter::RewriteOperation::toString() {
+  std::string opName = "TokenStreamRewriter";
+  size_t dollarIndex = opName.find('$');
+  opName = opName.substr(dollarIndex + 1, opName.length() - (dollarIndex + 1));
+  return "<" + opName + "@" +
+         outerInstance->tokens->get(dollarIndex)->getText() + ":\"" + text +
+         "\">";
+}
+
+void TokenStreamRewriter::RewriteOperation::InitializeInstanceFields() {
+  instructionIndex = 0;
+  index = 0;
+}
+
+TokenStreamRewriter::InsertBeforeOp::InsertBeforeOp(
+    TokenStreamRewriter* outerInstance_, size_t index_,
+    const std::string& text_)
+    : RewriteOperation(outerInstance_, index_, text_),
+      outerInstance(outerInstance_) {}
+
+size_t TokenStreamRewriter::InsertBeforeOp::execute(std::string* buf) {
+  buf->append(text);
+  if (outerInstance->tokens->get(index)->getType() != Token::EOF) {
+    buf->append(outerInstance->tokens->get(index)->getText());
+  }
+  return index + 1;
+}
+
+TokenStreamRewriter::ReplaceOp::ReplaceOp(TokenStreamRewriter* outerInstance_,
+                                          size_t from, size_t to,
+                                          const std::string& text)
+    : RewriteOperation(outerInstance_, from, text),
+      outerInstance(outerInstance_) {
+  InitializeInstanceFields();
+  lastIndex = to;
+}
+
+size_t TokenStreamRewriter::ReplaceOp::execute(std::string* buf) {
+  buf->append(text);
+  return lastIndex + 1;
+}
+
+std::string TokenStreamRewriter::ReplaceOp::toString() {
+  if (text.empty()) {
+    return "<DeleteOp@" + outerInstance->tokens->get(index)->getText() + ".." +
+           outerInstance->tokens->get(lastIndex)->getText() + ">";
+  }
+  return "<ReplaceOp@" + outerInstance->tokens->get(index)->getText() + ".." +
+         outerInstance->tokens->get(lastIndex)->getText() + ":\"" + text +
+         "\">";
+}
+
+void TokenStreamRewriter::ReplaceOp::InitializeInstanceFields() {
+  lastIndex = 0;
+}
+
+//------------------ TokenStreamRewriter
+//-------------------------------------------------------------------------------
+
+const std::string TokenStreamRewriter::DEFAULT_PROGRAM_NAME = "default";
+
+TokenStreamRewriter::TokenStreamRewriter(TokenStream* tokens_)
+    : tokens(tokens_) {
+  _programs[DEFAULT_PROGRAM_NAME].reserve(PROGRAM_INIT_SIZE);
+}
+
+TokenStreamRewriter::~TokenStreamRewriter() {
+  for (auto program : _programs) {
+    for (auto operation : program.second) {
+      delete operation;
+    }
+  }
+}
+
+TokenStream* TokenStreamRewriter::getTokenStream() { return tokens; }
+
+void TokenStreamRewriter::rollback(size_t instructionIndex) {
+  rollback(DEFAULT_PROGRAM_NAME, instructionIndex);
+}
+
+void TokenStreamRewriter::rollback(const std::string& programName,
+                                   size_t instructionIndex) {
+  std::vector<RewriteOperation*> is = _programs[programName];
+  if (is.size() > 0) {
+    _programs.insert({programName, std::vector<RewriteOperation*>(
+                                       is.begin() + MIN_TOKEN_INDEX,
+                                       is.begin() + instructionIndex)});
+  }
+}
+
+void TokenStreamRewriter::deleteProgram() {
+  deleteProgram(DEFAULT_PROGRAM_NAME);
+}
+
+void TokenStreamRewriter::deleteProgram(const std::string& programName) {
+  rollback(programName, MIN_TOKEN_INDEX);
+}
+
+void TokenStreamRewriter::insertAfter(Token* t, const std::string& text) {
+  insertAfter(DEFAULT_PROGRAM_NAME, t, text);
+}
+
+void TokenStreamRewriter::insertAfter(size_t index, const std::string& text) {
+  insertAfter(DEFAULT_PROGRAM_NAME, index, text);
+}
+
+void TokenStreamRewriter::insertAfter(const std::string& programName, Token* t,
+                                      const std::string& text) {
+  insertAfter(programName, t->getTokenIndex(), text);
+}
+
+void TokenStreamRewriter::insertAfter(const std::string& programName,
+                                      size_t index, const std::string& text) {
+  // to insert after, just insert before next index (even if past end)
+  insertBefore(programName, index + 1, text);
+}
+
+void TokenStreamRewriter::insertBefore(Token* t, const std::string& text) {
+  insertBefore(DEFAULT_PROGRAM_NAME, t, text);
+}
+
+void TokenStreamRewriter::insertBefore(size_t index, const std::string& text) {
+  insertBefore(DEFAULT_PROGRAM_NAME, index, text);
+}
+
+void TokenStreamRewriter::insertBefore(const std::string& programName, Token* t,
+                                       const std::string& text) {
+  insertBefore(programName, t->getTokenIndex(), text);
+}
+
+void TokenStreamRewriter::insertBefore(const std::string& programName,
+                                       size_t index, const std::string& text) {
+  RewriteOperation* op =
+      new InsertBeforeOp(this, index, text); /* mem-check: deleted in d-tor */
+  std::vector<RewriteOperation*>& rewrites = getProgram(programName);
+  op->instructionIndex = rewrites.size();
+  rewrites.push_back(op);
+}
+
+void TokenStreamRewriter::replace(size_t index, const std::string& text) {
+  replace(DEFAULT_PROGRAM_NAME, index, index, text);
+}
+
+void TokenStreamRewriter::replace(size_t from, size_t to,
+                                  const std::string& text) {
+  replace(DEFAULT_PROGRAM_NAME, from, to, text);
+}
+
+void TokenStreamRewriter::replace(Token* indexT, const std::string& text) {
+  replace(DEFAULT_PROGRAM_NAME, indexT, indexT, text);
+}
+
+void TokenStreamRewriter::replace(Token* from, Token* to,
+                                  const std::string& text) {
+  replace(DEFAULT_PROGRAM_NAME, from, to, text);
+}
+
+void TokenStreamRewriter::replace(const std::string& programName, size_t from,
+                                  size_t to, const std::string& text) {
+  if (from > to || to >= tokens->size()) {
+    throw IllegalArgumentException(
+        "replace: range invalid: " + std::to_string(from) + ".." +
+        std::to_string(to) + "(size = " + std::to_string(tokens->size()) + ")");
+  }
+  RewriteOperation* op =
+      new ReplaceOp(this, from, to, text); /* mem-check: deleted in d-tor */
+  std::vector<RewriteOperation*>& rewrites = getProgram(programName);
+  op->instructionIndex = rewrites.size();
+  rewrites.push_back(op);
+}
+
+void TokenStreamRewriter::replace(const std::string& programName, Token* from,
+                                  Token* to, const std::string& text) {
+  replace(programName, from->getTokenIndex(), to->getTokenIndex(), text);
+}
+
+void TokenStreamRewriter::Delete(size_t index) {
+  Delete(DEFAULT_PROGRAM_NAME, index, index);
+}
+
+void TokenStreamRewriter::Delete(size_t from, size_t to) {
+  Delete(DEFAULT_PROGRAM_NAME, from, to);
+}
+
+void TokenStreamRewriter::Delete(Token* indexT) {
+  Delete(DEFAULT_PROGRAM_NAME, indexT, indexT);
+}
+
+void TokenStreamRewriter::Delete(Token* from, Token* to) {
+  Delete(DEFAULT_PROGRAM_NAME, from, to);
+}
+
+void TokenStreamRewriter::Delete(const std::string& programName, size_t from,
+                                 size_t to) {
+  std::string nullString;
+  replace(programName, from, to, nullString);
+}
+
+void TokenStreamRewriter::Delete(const std::string& programName, Token* from,
+                                 Token* to) {
+  std::string nullString;
+  replace(programName, from, to, nullString);
+}
+
+size_t TokenStreamRewriter::getLastRewriteTokenIndex() {
+  return getLastRewriteTokenIndex(DEFAULT_PROGRAM_NAME);
+}
+
+size_t TokenStreamRewriter::getLastRewriteTokenIndex(
+    const std::string& programName) {
+  if (_lastRewriteTokenIndexes.find(programName) ==
+      _lastRewriteTokenIndexes.end()) {
+    return INVALID_INDEX;
+  }
+  return _lastRewriteTokenIndexes[programName];
+}
+
+void TokenStreamRewriter::setLastRewriteTokenIndex(
+    const std::string& programName, size_t i) {
+  _lastRewriteTokenIndexes.insert({programName, i});
+}
+
+std::vector<TokenStreamRewriter::RewriteOperation*>&
+TokenStreamRewriter::getProgram(const std::string& name) {
+  auto iterator = _programs.find(name);
+  if (iterator == _programs.end()) {
+    return initializeProgram(name);
+  }
+  return iterator->second;
+}
+
+std::vector<TokenStreamRewriter::RewriteOperation*>&
+TokenStreamRewriter::initializeProgram(const std::string& name) {
+  _programs[name].reserve(PROGRAM_INIT_SIZE);
+  return _programs[name];
+}
+
+std::string TokenStreamRewriter::getText() {
+  return getText(DEFAULT_PROGRAM_NAME, Interval(0UL, tokens->size() - 1));
+}
+
+std::string TokenStreamRewriter::getText(std::string programName) {
+  return getText(programName, Interval(0UL, tokens->size() - 1));
+}
+
+std::string TokenStreamRewriter::getText(const Interval& interval) {
+  return getText(DEFAULT_PROGRAM_NAME, interval);
+}
+
+std::string TokenStreamRewriter::getText(const std::string& programName,
+                                         const Interval& interval) {
+  std::vector<TokenStreamRewriter::RewriteOperation*>& rewrites =
+      _programs[programName];
+  size_t start = interval.a;
+  size_t stop = interval.b;
+
+  // ensure start/end are in range
+  if (stop > tokens->size() - 1) {
+    stop = tokens->size() - 1;
+  }
+  if (start == INVALID_INDEX) {
+    start = 0;
+  }
+
+  if (rewrites.empty() || rewrites.empty()) {
+    return tokens->getText(interval);  // no instructions to execute
+  }
+  std::string buf;
+
+  // First, optimize instruction stream
+  std::unordered_map<size_t, TokenStreamRewriter::RewriteOperation*> indexToOp =
+      reduceToSingleOperationPerIndex(rewrites);
+
+  // Walk buffer, executing instructions and emitting tokens
+  size_t i = start;
+  while (i <= stop && i < tokens->size()) {
+    RewriteOperation* op = indexToOp[i];
+    indexToOp.erase(i);  // remove so any left have index size-1
+    Token* t = tokens->get(i);
+    if (op == nullptr) {
+      // no operation at that index, just dump token
+      if (t->getType() != Token::EOF) {
+        buf.append(t->getText());
+      }
+      i++;  // move to next token
+    } else {
+      i = op->execute(&buf);  // execute operation and skip
+    }
+  }
+
+  // include stuff after end if it's last index in buffer
+  // So, if they did an insertAfter(lastValidIndex, "foo"), include
+  // foo if end==lastValidIndex.
+  if (stop == tokens->size() - 1) {
+    // Scan any remaining operations after last token
+    // should be included (they will be inserts).
+    for (auto op : indexToOp) {
+      if (op.second->index >= tokens->size() - 1) {
+        buf.append(op.second->text);
+      }
+    }
+  }
+  return buf;
+}
+
+std::unordered_map<size_t, TokenStreamRewriter::RewriteOperation*>
+TokenStreamRewriter::reduceToSingleOperationPerIndex(
+    std::vector<TokenStreamRewriter::RewriteOperation*>& rewrites) {
+  // WALK REPLACES
+  for (size_t i = 0; i < rewrites.size(); ++i) {
+    TokenStreamRewriter::RewriteOperation* op = rewrites[i];
+    ReplaceOp* rop = dynamic_cast<ReplaceOp*>(op);
+    if (rop == nullptr) continue;
+
+    // Wipe prior inserts within range
+    std::vector<InsertBeforeOp*> inserts =
+        getKindOfOps<InsertBeforeOp>(rewrites, i);
+    for (auto iop : inserts) {
+      if (iop->index == rop->index) {
+        // E.g., insert before 2, delete 2..2; update replace
+        // text to include insert before, kill insert
+        delete rewrites[iop->instructionIndex];
+        rewrites[iop->instructionIndex] = nullptr;
+        rop->text = iop->text + (!rop->text.empty() ? rop->text : "");
+      } else if (iop->index > rop->index && iop->index <= rop->lastIndex) {
+        // delete insert as it's a no-op.
+        delete rewrites[iop->instructionIndex];
+        rewrites[iop->instructionIndex] = nullptr;
+      }
+    }
+    // Drop any prior replaces contained within
+    std::vector<ReplaceOp*> prevReplaces = getKindOfOps<ReplaceOp>(rewrites, i);
+    for (auto prevRop : prevReplaces) {
+      if (prevRop->index >= rop->index &&
+          prevRop->lastIndex <= rop->lastIndex) {
+        // delete replace as it's a no-op.
+        delete rewrites[prevRop->instructionIndex];
+        rewrites[prevRop->instructionIndex] = nullptr;
+        continue;
+      }
+      // throw exception unless disjoint or identical
+      bool disjoint =
+          prevRop->lastIndex < rop->index || prevRop->index > rop->lastIndex;
+      bool same =
+          prevRop->index == rop->index && prevRop->lastIndex == rop->lastIndex;
+      // Delete special case of replace (text==null):
+      // D.i-j.u D.x-y.v    | boundaries overlap    combine to
+      // max(min)..max(right)
+      if (prevRop->text.empty() && rop->text.empty() && !disjoint) {
+        delete rewrites[prevRop->instructionIndex];
+        rewrites[prevRop->instructionIndex] = nullptr;  // kill first delete
+        rop->index = std::min(prevRop->index, rop->index);
+        rop->lastIndex = std::max(prevRop->lastIndex, rop->lastIndex);
+        std::cout << "new rop " << rop << std::endl;
+      } else if (!disjoint && !same) {
+        throw IllegalArgumentException(
+            "replace op boundaries of " + rop->toString() +
+            " overlap with previous " + prevRop->toString());
+      }
+    }
+  }
+
+  // WALK INSERTS
+  for (size_t i = 0; i < rewrites.size(); i++) {
+    InsertBeforeOp* iop = dynamic_cast<InsertBeforeOp*>(rewrites[i]);
+    if (iop == nullptr) continue;
+
+    // combine current insert with prior if any at same index
+
+    std::vector<InsertBeforeOp*> prevInserts =
+        getKindOfOps<InsertBeforeOp>(rewrites, i);
+    for (auto prevIop : prevInserts) {
+      if (prevIop->index == iop->index) {  // combine objects
+                                           // convert to strings...we're in
+                                           // process of toString'ing whole
+                                           // token buffer so no lazy eval issue
+                                           // with any templates
+        iop->text = catOpText(&iop->text, &prevIop->text);
+        // delete redundant prior insert
+        delete rewrites[prevIop->instructionIndex];
+        rewrites[prevIop->instructionIndex] = nullptr;
+      }
+    }
+    // look for replaces where iop.index is in range; error
+    std::vector<ReplaceOp*> prevReplaces = getKindOfOps<ReplaceOp>(rewrites, i);
+    for (auto rop : prevReplaces) {
+      if (iop->index == rop->index) {
+        rop->text = catOpText(&iop->text, &rop->text);
+        delete rewrites[i];
+        rewrites[i] = nullptr;  // delete current insert
+        continue;
+      }
+      if (iop->index >= rop->index && iop->index <= rop->lastIndex) {
+        throw IllegalArgumentException("insert op " + iop->toString() +
+                                       " within boundaries of previous " +
+                                       rop->toString());
+      }
+    }
+  }
+
+  std::unordered_map<size_t, TokenStreamRewriter::RewriteOperation*> m;
+  for (TokenStreamRewriter::RewriteOperation* op : rewrites) {
+    if (op == nullptr) {  // ignore deleted ops
+      continue;
+    }
+    if (m.count(op->index) > 0) {
+      throw RuntimeException("should only be one op per index");
+    }
+    m[op->index] = op;
+  }
+
+  return m;
+}
+
+std::string TokenStreamRewriter::catOpText(std::string* a, std::string* b) {
+  std::string x = "";
+  std::string y = "";
+  if (a != nullptr) {
+    x = *a;
+  }
+  if (b != nullptr) {
+    y = *b;
+  }
+  return x + y;
+}