+/* 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 "misc/Interval.h"
+#include "Token.h"
+#include "TokenStream.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;
+ // 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) {
+ 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;
+}
projects / toc / blobdiff