Move frog/leg to lib/compiler/implementation.

frog/leg/source_file.dart

-// 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.
-
-#library('source_file');
-
-#import('colors.dart');
-
-/**
- * Represents a file of source code.
- */
-class SourceFile {
-
-  /** The name of the file. */
-  final String filename;
-
-  /** The text content of the file. */
-  final String text;
-
-  List<int> _lineStarts;
-
-  SourceFile(this.filename, this.text);
-
-  List<int> get lineStarts() {
-    if (_lineStarts == null) {
-      var starts = [0];
-      var index = 0;
-      while (index < text.length) {
-        index = text.indexOf('\n', index) + 1;
-        if (index <= 0) break;
-        starts.add(index);
-      }
-      starts.add(text.length + 1);
-      _lineStarts = starts;
-    }
-    return _lineStarts;
-  }
-
-  int getLine(int position) {
-    // TODO(jimhug): Implement as binary search.
-    var starts = lineStarts;
-    for (int i=0; i < starts.length; i++) {
-      if (starts[i] > position) return i-1;
-    }
-    throw 'bad position';
-  }
-
-  int getColumn(int line, int position) {
-    return position - lineStarts[line];
-  }
-
-  /**
-   * Create a pretty string representation from a character position
-   * in the file.
-   */
-  String getLocationMessage(String message, int start,
-      [int end, bool includeText=false, bool useColors = true]) {
-    var line = getLine(start);
-    var column = getColumn(line, start);
-
-    var buf = new StringBuffer(
-        '${filename}:${line + 1}:${column + 1}: $message');
-    if (includeText) {
-      buf.add('\n');
-      var textLine;
-      // +1 for 0-indexing, +1 again to avoid the last line of the file
-      if ((line + 2) < _lineStarts.length) {
-        textLine = text.substring(_lineStarts[line], _lineStarts[line+1]);
-      } else {
-        textLine = text.substring(_lineStarts[line]) + '\n';
-      }
-
-      int toColumn = Math.min(column + (end-start), textLine.length);
-      if (useColors) {
-        buf.add(textLine.substring(0, column));
-        buf.add(RED_COLOR);
-        buf.add(textLine.substring(column, toColumn));
-        buf.add(NO_COLOR);
-        buf.add(textLine.substring(toColumn));
-      } else {
-        buf.add(textLine);
-      }
-
-      int i = 0;
-      for (; i < column; i++) {
-        buf.add(' ');
-      }
-
-      if (useColors) buf.add(RED_COLOR);
-      for (; i < toColumn; i++) {
-        buf.add('^');
-      }
-      if (useColors) buf.add(NO_COLOR);
-    }
-
-    return buf.toString();
-  }
-}