public HlslLexer(SourceFile file, HlslParseOptions options = null, IIncludeFileSystem includeFileSystem = null)
{
_rootFile = file;
_includeFileResolver = new IncludeFileResolver(
includeFileSystem ?? new DummyFileSystem(),
options ?? new HlslParseOptions());
_directives = DirectiveStack.Empty;
if (options != null)
{
foreach (var define in options.PreprocessorDefines)
{
var lexer = new HlslLexer(new SourceFile(
SourceText.From($"#define {define.Key} {define.Value}"),
"__ConfiguredPreprocessorDefinitions__.hlsl"));
lexer._mode = LexerMode.Directive;
lexer.ExpandMacros = false;
var dp = new DirectiveParser(lexer, _directives);
var directive = dp.ParseDirective(true, true, false);
_directives = directive.ApplyDirectives(_directives);
}
}
ExpandMacros = true;
FileSegments = new List <FileSegment>();
_includeStack = new Stack <IncludeContext>();
PushIncludeContext(file);
}
private SyntaxNode LexSingleDirective(
bool isActive,
bool endIsActive,
bool afterNonWhitespaceOnLine,
List <SyntaxNode> triviaList)
{
_start = _charReader.Position;
if (char.IsWhiteSpace(_charReader.Current))
{
ReadWhitespace();
AddTrivia(triviaList, SyntaxKind.WhitespaceTrivia);
}
var saveMode = _mode;
var saveExpandMacros = ExpandMacros;
_mode = LexerMode.Directive;
ExpandMacros = false;
var dp = new DirectiveParser(this, _directives);
var directive = dp.ParseDirective(isActive, endIsActive, afterNonWhitespaceOnLine);
if (!isActive || directive.Kind != SyntaxKind.IncludeDirectiveTrivia)
{
triviaList.Add(directive);
}
_directives = directive.ApplyDirectives(_directives);
ExpandMacros = saveExpandMacros;
_mode = saveMode;
// Directive parser sometimes leaves charReader at start of token *after* the one we want.
_charReader.Reset(directive.GetLastChildToken().GetLastSpanIncludingTrivia().End);
_start = _charReader.Position;
return(directive);
}
public DirectiveParser(HlslLexer lexer, DirectiveStack directiveStack)
: base(lexer, LexerMode.Directive)
{
_lexer = lexer;
_directiveStack = directiveStack;
}
