/// <summary>
/// Parse a shader source.
/// </summary>
/// <param name="source">
/// A <see cref="String"/> that specify the shader source text. It can contains multiple lines.
/// </param>
/// <returns>
/// It returns the result of preprocessing of <paramref name="source"/>.
/// </returns>
public static List<string> Process(List<string> source)
{
Context ctx = new Context();
List<string> processedSource = new List<string>();
for (int sourceLineNumber = 0; sourceLineNumber < source.Count; sourceLineNumber++) {
Match directiveMatch;
string sourceLine = source[sourceLineNumber];
if ((directiveMatch = _RegexDirective.Match(sourceLine)).Success) {
StringBuilder sb = new StringBuilder();
do {
// Concatenate backslashed new line
sb.AppendLine(sourceLine);
// End of lines?
if (++sourceLineNumber < source.Count)
break;
// Next line
sourceLine = source[++sourceLineNumber];
} while (sourceLine.TrimEnd().EndsWith(@"\"));
// Replace backslash-newline with newlines
sourceLine = _RegexBackslashNewline.Replace(sb.ToString(), "\n");
// Remove C++ comments (still preserve new lines)
sourceLine = _RegexCppComment.Replace(sourceLine, " ");
// Remove C comments (still preserve new lines, except the commented ones)
sourceLine = _RegexCComment.Replace(sourceLine, " ");
// Build a single long directive line (discards new lines)
sourceLine = _RegexNewline.Replace(sourceLine, String.Empty);
// Parse preprocessor directive
string directive = directiveMatch.Groups["Directive"].Value;
if (directive == "define") {
ParseDefineDirective(ctx, sourceLine);
} else if (directive == "undef") {
ParseUndef(ctx, sourceLine);
} else if (directive == "if") {
Context.ConditionalState conditionalState = new Context.ConditionalState();
conditionalState.ActiveBranch = ParseIntegerConditional(ctx, sourceLine);
} else if (directive == "elif") {
if (ctx.ConditionalNesting.Count == 0)
throw new InvalidOperationException("#elif directive without matching #if");
Context.ConditionalState conditionalState = ctx.ConditionalNesting.Peek();
if (conditionalState.HadElseBranch)
throw new InvalidOperationException("#elif directive after matching #else");
// Evaluate condition
bool active = ParseIntegerConditional(ctx, sourceLine);
if (conditionalState.HadActiveBranch == false)
conditionalState.ActiveBranch = active;
} else if ((directive == "ifdef") || (directive == "ifndef")) {
Context.ConditionalState conditionalState = new Context.ConditionalState();
conditionalState.ActiveBranch = ParseSymbolConditional(ctx, sourceLine);
} else if (directive == "else") {
if (ctx.ConditionalNesting.Count == 0)
throw new InvalidOperationException("#else directive without matching #if");
Context.ConditionalState conditionalState = ctx.ConditionalNesting.Peek();
if (conditionalState.HadElseBranch)
throw new InvalidOperationException("multiple #else directive for matching #if");
conditionalState.HadElseBranch = true;
conditionalState.ActiveBranch = !conditionalState.HadActiveBranch;
} else if (directive == "endif") {
if (ctx.ConditionalNesting.Count == 0)
throw new InvalidOperationException("#endif directive without matching #if");
// Remove last branching state
ctx.ConditionalNesting.Pop();
} else if (directive == "include") {
} else
throw new InvalidOperationException("unknown preprocessor directive");
// Append source line
processedSource.Add(sourceLine);
} else {
// Append source line
processedSource.Add(sourceLine);
}
}
return (processedSource);
}
/// <summary>
/// Parse a shader source.
/// </summary>
/// <param name="source">
/// A <see cref="String"/> that specify the shader source text. It can contains multiple lines.
/// </param>
/// <returns>
/// It returns the result of preprocessing of <paramref name="source"/>.
/// </returns>
public static List <string> Process(List <string> source)
{
Context ctx = new Context();
List <string> processedSource = new List <string>();
for (int sourceLineNumber = 0; sourceLineNumber < source.Count; sourceLineNumber++)
{
Match directiveMatch;
string sourceLine = source[sourceLineNumber];
if ((directiveMatch = _RegexDirective.Match(sourceLine)).Success)
{
StringBuilder sb = new StringBuilder();
do
{
// Concatenate backslashed new line
sb.AppendLine(sourceLine);
// End of lines?
if (++sourceLineNumber < source.Count)
{
break;
}
// Next line
sourceLine = source[++sourceLineNumber];
} while (sourceLine.TrimEnd().EndsWith(@"\"));
// Replace backslash-newline with newlines
sourceLine = _RegexBackslashNewline.Replace(sb.ToString(), "\n");
// Remove C++ comments (still preserve new lines)
sourceLine = _RegexCppComment.Replace(sourceLine, " ");
// Remove C comments (still preserve new lines, except the commented ones)
sourceLine = _RegexCComment.Replace(sourceLine, " ");
// Build a single long directive line (discards new lines)
sourceLine = _RegexNewline.Replace(sourceLine, String.Empty);
// Parse preprocessor directive
string directive = directiveMatch.Groups["Directive"].Value;
if (directive == "define")
{
ParseDefineDirective(ctx, sourceLine);
}
else if (directive == "undef")
{
ParseUndef(ctx, sourceLine);
}
else if (directive == "if")
{
Context.ConditionalState conditionalState = new Context.ConditionalState();
conditionalState.ActiveBranch = ParseIntegerConditional(ctx, sourceLine);
}
else if (directive == "elif")
{
if (ctx.ConditionalNesting.Count == 0)
{
throw new InvalidOperationException("#elif directive without matching #if");
}
Context.ConditionalState conditionalState = ctx.ConditionalNesting.Peek();
if (conditionalState.HadElseBranch)
{
throw new InvalidOperationException("#elif directive after matching #else");
}
// Evaluate condition
bool active = ParseIntegerConditional(ctx, sourceLine);
if (conditionalState.HadActiveBranch == false)
{
conditionalState.ActiveBranch = active;
}
}
else if ((directive == "ifdef") || (directive == "ifndef"))
{
Context.ConditionalState conditionalState = new Context.ConditionalState();
conditionalState.ActiveBranch = ParseSymbolConditional(ctx, sourceLine);
}
else if (directive == "else")
{
if (ctx.ConditionalNesting.Count == 0)
{
throw new InvalidOperationException("#else directive without matching #if");
}
Context.ConditionalState conditionalState = ctx.ConditionalNesting.Peek();
if (conditionalState.HadElseBranch)
{
throw new InvalidOperationException("multiple #else directive for matching #if");
}
conditionalState.HadElseBranch = true;
conditionalState.ActiveBranch = !conditionalState.HadActiveBranch;
}
else if (directive == "endif")
{
if (ctx.ConditionalNesting.Count == 0)
{
throw new InvalidOperationException("#endif directive without matching #if");
}
// Remove last branching state
ctx.ConditionalNesting.Pop();
}
else if (directive == "include")
{
}
else
{
throw new InvalidOperationException("unknown preprocessor directive");
}
// Append source line
processedSource.Add(sourceLine);
}
else
{
// Append source line
processedSource.Add(sourceLine);
}
}
return(processedSource);
}
