Set breakpoint at url, line number

runtime/vm/scanner.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/scanner.h"
 
 #include "platform/assert.h"
 #include "vm/flags.h"
 #include "vm/object.h"
 #include "vm/thread.h"
 #include "vm/token.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, print_tokens, false, "Print scanned tokens.");
 
 void Scanner::InitKeywordTable() {
   for (int i = 0; i < Token::numKeywords; i++) {
     Token::Kind token = static_cast<Token::Kind>(Token::kFirstKeyword + i);
     keywords_[i].kind = token;
     keywords_[i].keyword_chars = Token::Str(token);
     keywords_[i].keyword_len = strlen(Token::Str(token));
     keywords_[i].keyword_symbol = NULL;
   }
 }
 
 
+void Scanner::Reset() {
+  lookahead_pos_ = 0;
+  token_start_ = 0;
+  c0_ = source_length_ == 0 ? '\0' : source_.CharAt(0);
+  newline_seen_ = false;
+  while (saved_context_ != NULL) {
+    ScanContext* ctx = saved_context_;
+    saved_context_ = ctx->next;
+    delete ctx;
+  }
+  string_delimiter_ = '\0';
+  string_is_multiline_ = false;
+  brace_level_ = 0;
+  c0_pos_.line = 1;
+  c0_pos_.column = 1;
+}
+
+
 Scanner::Scanner(const String& src, const String& private_key)
     : source_(src),
       source_length_(src.Length()),
-      lookahead_pos_(0),
-      token_start_(0),
-      c0_(source_length_ == 0 ? '\0' : src.CharAt(0)),
-      newline_seen_(false),
       saved_context_(NULL),
-      string_delimiter_('\0'),
-      string_is_multiline_(false),
-      brace_level_(0),
       private_key_(String::ZoneHandle(private_key.raw())) {
-  c0_pos_.line = 1;
-  c0_pos_.column = 1;
+  Reset();
   InitKeywordTable();
 }
 
+Scanner::~Scanner() {
+  while (saved_context_ != NULL) {
+    ScanContext* ctx = saved_context_;
+    saved_context_ = ctx->next;
+    delete ctx;
+  }
+}
+
+
 void Scanner::ErrorMsg(const char* msg) {
   current_token_.kind = Token::kERROR;
   current_token_.literal = &String::ZoneHandle(String::NewSymbol(msg));
   current_token_.position = c0_pos_;
   token_start_ = lookahead_pos_;
   current_token_.offset = lookahead_pos_;
 }
 
 
 void Scanner::PushContext() {
@@ skipping 733 matching lines @@
           ErrorMsg(msg);
           ReadChar();
         }
     }
   } while (current_token_.kind == Token::kWHITESP);
   current_token_.length = lookahead_pos_ - token_start_;
 }
 
 
 void Scanner::ScanAll(GrowableTokenStream* token_stream) {
+  Reset();
   do {
     Scan();
     token_stream->Add(current_token_);
   } while (current_token_.kind != Token::kEOS);
 }
 
+
 void Scanner::ScanTo(intptr_t token_index) {
   int index = 0;
+  Reset();
   do {
     Scan();
     index++;
   } while ((token_index >= index) && (current_token_.kind != Token::kEOS));
 }
 
 
+intptr_t Scanner::TokenIndexAtLine(intptr_t line_number) {
+  ASSERT(line_number >= 0);
+  Reset();
+  int token_index = 0;
+  do {
+    Scan();
+    if (current_token_.position.line >= line_number) {
+      return token_index;
+    }
+    token_index++;
+  } while (current_token_.kind != Token::kEOS);
+  return -1;
+}
+
+
+
 const Scanner::GrowableTokenStream& Scanner::GetStream() {
   GrowableTokenStream* ts = new GrowableTokenStream(128);
   ScanAll(ts);
   if (FLAG_print_tokens) {
     Scanner::PrintTokens(*ts);
   }
   return *ts;
 }
 
 
@@ skipping 22 matching lines @@
               "%c%"PRIxPTR, kPrivateKeySeparator, key_value);
   const String& result = String::Handle(String::New(private_key));
   return result.raw();
 }
 
 
 void Scanner::InitOnce() {
 }
 
 }  // namespace dart