Set breakpoint at url, line number

runtime/vm/scanner.h

 // Copyright (c) 2011, 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.
 //
 // Scanner class for the Dart language. The scanner reads source text
 // and produces a stream of tokens which is used by the parser.
 //
 
 #ifndef VM_SCANNER_H_
 #define VM_SCANNER_H_
@@ skipping 33 matching lines @@
   // Character used to indicate a private identifier.
   static const char kPrivateIdentifierStart  = '_';
 
   // Character used to separate the private identifier from the key.
   static const char kPrivateKeySeparator = '@';
 
   typedef ZoneGrowableArray<TokenDescriptor> GrowableTokenStream;
 
   // Initializes scanner to scan string source.
   Scanner(const String& source, const String& private_key);
+  ~Scanner();
 
   // Scans one token at a time.
   void Scan();
 
   // Scans to specified token position.
   // Use CurrentPosition() to extract position.
   void ScanTo(intptr_t token_index);
 
+  // Returns token index of first token on or after given line number.
+  // Returns negative value if no token exists on or after the line.
+  intptr_t TokenIndexAtLine(intptr_t line_number);
+
   // Scans entire source and returns a stream of tokens.
   // Should be called only once.
   const GrowableTokenStream& GetStream();
 
   // Info about most recently recognized token.
   const TokenDescriptor& current_token() const { return current_token_; }
 
   // Was there a line break before the current token?
   bool NewlineBeforeToken() const { return newline_seen_; }
 
@@ skipping 18 matching lines @@
     int  brace_level;
   };
 
   struct KeywordTable {
     Token::Kind kind;
     const char* keyword_chars;
     int keyword_len;
     String* keyword_symbol;
   };
 
+  // Rewind scanner position to token 0.
+  void Reset();
+
   // Initialize Scanner tables.
   void InitKeywordTable();
 
   // Reads next lookahead character.
   void ReadChar();
 
   // Read and discard characters up to end of line.
   void SkipLine();
 
   // Recognizes token 'kind' and reads next character in input.
@@ skipping 87 matching lines @@
   const String& private_key_;
 
   SourcePosition c0_pos_;      // Source position of lookahead character c0_.
   KeywordTable keywords_[Token::numKeywords];
 };
 
 
 }  // namespace dart
 
 #endif  // VM_SCANNER_H_