/// <summary>
/// Formats the specified snapshot range.
/// </summary>
/// <param name="snapshotRange"> The snapshot range. </param>
public void Format(TextSnapshotRange snapshotRange)
{
// Get the snapshot
var snapshot = snapshotRange.Snapshot;
if (snapshot == null)
return;
// Get the snapshot reader
var reader = snapshot.GetReader(snapshotRange.StartOffset);
// Get the code document
var document = snapshot.Document as ICodeDocument;
if (document == null)
return;
// Get the tab size
var tabSize = document.TabSize;
// Create a text change object for the document
var options = new TextChangeOptions();
// Changes must occur sequentially so that we can use unmodified offsets while looping over the document
options.OffsetDelta = TextChangeOffsetDelta.SequentialOnly;
options.RetainSelection = true;
var change = document.CreateTextChange(TextChangeTypes.AutoFormat, options);
// Keep track of the last non whitespace token Id
var lastNonWhitespaceTokenId = -1;
// Keep track of the indent level
var indentLevel = 0;
// Loop through the document
while ((reader.Token != null) && (reader.Offset < snapshotRange.EndOffset))
{
// If the token is whitespace, delete the text
if (reader.Token.Id == JsonTokenId.Whitespace)
{
change.DeleteText(reader.Token.TextRange);
}
else
{
// The token is not whitespace
// Create a variable that will contain the text to be inserted
var insertText = "";
// Determine the insertText value based on the previous non-whitespace token and the current token
switch (lastNonWhitespaceTokenId)
{
case JsonTokenId.OpenCurlyBrace:
case JsonTokenId.OpenSquareBrace:
{
if (reader.Token.Id != JsonTokenId.CloseCurlyBrace &&
reader.Token.Id != JsonTokenId.CloseSquareBrace)
{
indentLevel++;
}
insertText = Environment.NewLine +
StringHelper.GetIndentText(document.AutoConvertTabsToSpaces, tabSize,
indentLevel * tabSize);
break;
}
case JsonTokenId.Colon :
{
insertText = " ";
break;
}
case JsonTokenId.Comma :
{
if (reader.Token.Id == JsonTokenId.CloseCurlyBrace ||
reader.Token.Id == JsonTokenId.CloseSquareBrace)
{
indentLevel = Math.Max(0, indentLevel - 1);
}
insertText = Environment.NewLine +
StringHelper.GetIndentText(document.AutoConvertTabsToSpaces, tabSize,
indentLevel * tabSize);
break;
}
case JsonTokenId.CloseCurlyBrace:
case JsonTokenId.CloseSquareBrace:
case JsonTokenId.False:
case JsonTokenId.True:
case JsonTokenId.Number:
case JsonTokenId.StringEndDelimiter:
case JsonTokenId.Null:
{
if (reader.Token.Id == JsonTokenId.CloseCurlyBrace ||
reader.Token.Id == JsonTokenId.CloseSquareBrace)
{
indentLevel = Math.Max(0, indentLevel - 1);
insertText = Environment.NewLine +
StringHelper.GetIndentText(document.AutoConvertTabsToSpaces, tabSize,
indentLevel*tabSize);
}
}
break;
}
// Insert the replacement text
change.InsertText(reader.Token.StartOffset, insertText);
// Update the last non-whitespace token Id
lastNonWhitespaceTokenId = reader.Token.Id;
}
// Go to the next token
reader.GoToNextToken();
}
// If the entire document was formatted, add a newline to the end
if ((snapshot.SnapshotRange.StartOffset == snapshotRange.StartOffset)
&& (snapshot.SnapshotRange.EndOffset == snapshotRange.EndOffset))
change.InsertText(snapshotRange.EndOffset, "\n");
// Apply the changes
change.Apply();
}