/// <summary>
/// Parses all shader field declarations, aggregated with their metadata directives.
/// </summary>
/// <param name="source"></param>
/// <param name="ignoreRegions"></param>
/// <param name="removeSchedule"></param>
private void ParseFields(string source, List <IndexRange> ignoreRegions, List <IndexRange> removeSchedule)
{
// Read the source line by line and parse it along the way
List <string> fieldMetadata = new List <string>();
using (StringReader reader = new StringReader(source))
{
int lineIndex = 0;
while (true)
{
string line = reader.ReadLine();
if (line == null)
{
break;
}
// Trim the current line, so ignored ranges are removed
IndexRange lineRange = new IndexRange(lineIndex, line.Length);
IndexRange trimmedLineRange = lineRange;
foreach (IndexRange ignoreRange in ignoreRegions)
{
trimmedLineRange.Trim(ignoreRange);
if (trimmedLineRange.Length == 0)
{
break;
}
}
foreach (IndexRange ignoreRange in removeSchedule)
{
trimmedLineRange.Trim(ignoreRange);
if (trimmedLineRange.Length == 0)
{
break;
}
}
string trimmedLine =
(trimmedLineRange.Length == 0) ?
string.Empty :
source.Substring(trimmedLineRange.Index, trimmedLineRange.Length);
// Keep track of where we are in the source, and skip over lines that
// fall within source regions that are flagged to be ignored.
lineIndex += line.Length;
lineIndex += Environment.NewLine.Length;
// Cleanup remaining line to make it easier to parse
trimmedLine = trimmedLine.Trim().TrimEnd(';');
if (string.IsNullOrEmpty(trimmedLine))
{
continue;
}
// Scan for metadata directives and store them until we hit the next variable declaration
Match metadataMatch = RegexMetadataDirective.Match(trimmedLine);
if (metadataMatch != null && metadataMatch.Length > 0)
{
string metadataDirective = metadataMatch.Groups[1].Value;
fieldMetadata.Add(metadataDirective);
continue;
}
// Scan for field declarations and aggregate them with previously collected metadata directives
ShaderFieldInfo field = this.ParseFieldDeclaration(trimmedLine, fieldMetadata);
if (field != null)
{
this.fields.Add(field);
fieldMetadata.Clear();
continue;
}
// Clear metadata directives when reading non-empty lines that don't match any of the above
fieldMetadata.Clear();
}
}
}
/// <summary>
/// Identify continuous blocks of variable metadata directives, mapped to the range of source code
/// they're located in.
/// </summary>
/// <param name="source"></param>
/// <param name="ignoreRegions"></param>
private Dictionary <IndexRange, List <IndexRange> > IdentifyMetadataBlocks(string source, List <IndexRange> ignoreRegions)
{
Dictionary <IndexRange, List <IndexRange> > metadataBlocks = new Dictionary <IndexRange, List <IndexRange> >();
using (StringReader reader = new StringReader(source))
{
List <IndexRange> currentBlock = new List <IndexRange>();
IndexRange currentBlockRange = new IndexRange(0, 0);
int lineIndex = 0;
while (true)
{
string line = reader.ReadLine();
if (line == null)
{
break;
}
// Trim the current line, so ignored ranges are removed
IndexRange lineRange = new IndexRange(lineIndex, line.Length);
IndexRange trimmedLineRange = lineRange;
foreach (IndexRange ignoreRange in ignoreRegions)
{
trimmedLineRange.Trim(ignoreRange);
if (trimmedLineRange.Length == 0)
{
break;
}
}
string trimmedLine =
(trimmedLineRange.Length == 0) ?
string.Empty :
source.Substring(trimmedLineRange.Index, trimmedLineRange.Length);
// Process the current line
bool isLineEmpty = string.IsNullOrWhiteSpace(trimmedLine);
if (!isLineEmpty)
{
Match match = RegexMetadataDirective.Match(trimmedLine);
if (match != null && match.Length > 0)
{
// Extend the current metadata block to include the detected directive
IndexRange metadataRange = new IndexRange(trimmedLineRange.Index + match.Index, match.Length);
metadataRange = this.ExpandToLine(source, metadataRange);
currentBlock.Add(metadataRange);
currentBlockRange.Length = (metadataRange.Index + metadataRange.Length) - currentBlockRange.Index;
}
else
{
// Close the current metadata block
if (currentBlock.Count > 0)
{
metadataBlocks.Add(currentBlockRange, new List <IndexRange>(currentBlock));
}
// Start a new metadata block
currentBlock.Clear();
currentBlockRange.Index = lineRange.Index + lineRange.Length + Environment.NewLine.Length;
currentBlockRange.Length = 0;
}
}
else
{
// If we have a current block, incorporate comment and empty lines into it until it ends
if (currentBlock.Count > 0)
{
currentBlockRange.Length = (lineRange.Index + lineRange.Length) - currentBlockRange.Index;
}
// Otherwise, move the start of the current block forward until we actually find a metadata line
else
{
currentBlockRange.Index = lineRange.Index + lineRange.Length + Environment.NewLine.Length;
currentBlockRange.Length = 0;
}
}
lineIndex += line.Length;
lineIndex += Environment.NewLine.Length;
}
}
return(metadataBlocks);
}
