/// <summary>
/// Analyze the list of expressions and separate them into a list of chunks. (HasValue and !HasValue together)
/// </summary>
/// <returns>List of chunks - expressions chunked by that, if they are evaluable during compilation. Cannot return null.</returns>
private static List <ConcatChunk> AnalyzeChunks(Analyzer /*!*/ analyzer, IList <Expression> /*!*/ expressions)
{
Debug.Assert(expressions.Any());
List <ConcatChunk> chunks = new List <ConcatChunk>();
ConcatChunk lastChunk = null;
// flattern concatenation expressions:
expressions = ChainConcatenations(expressions);
// analyze chunks
foreach (var expr in expressions)
{
var evaluation = expr.Analyze(analyzer, ExInfoFromParent.DefaultExInfo);
// skip empty evaluated expressions
if (evaluation.HasValue &&
(
evaluation.Value == null ||
(evaluation.Value is string && ((string)evaluation.Value) == string.Empty) ||
Convert.ObjectToPhpBytes(evaluation.Value).Length == 0
))
{
continue; // empty literal => skip
}
// add chunk
if (lastChunk == null || lastChunk.HasValue != evaluation.HasValue)
{
chunks.Add(lastChunk = new ConcatChunk(expr.Span, evaluation));
}
else if (evaluation.HasValue)
{
lastChunk.Value = Operators.Concat(lastChunk.Value, evaluation.Value);
lastChunk.Position = Text.Span.Combine(lastChunk.Position, expr.Span);
}
else//if (!evaluation.HasValue)
{
lastChunk.Expressions.Add(evaluation.Expression);
lastChunk.Position = Text.Span.Combine(lastChunk.Position, expr.Span);
}
}
// there must be at least one expression
if (chunks.Count == 0)
{
var position = Text.Span.Invalid;
if (expressions.Count > 0)
{
position = expressions[0].Span;
}
chunks.Add(new ConcatChunk(position, string.Empty));
}
//
return(chunks);
}
/// <summary>
/// Analyze the list of expressions and separate them into a list of chunks. (HasValue and !HasValue together)
/// </summary>
/// <returns>List of chunks - expressions chunked by that, if they are evaluable during compilation. Cannot return null.</returns>
private static List<ConcatChunk> AnalyzeChunks(Analyzer/*!*/ analyzer, List<Expression>/*!*/expressions)
{
Debug.Assert(expressions != null);
Debug.Assert(expressions.Count > 0);
List<ConcatChunk> chunks = new List<ConcatChunk>();
ConcatChunk lastChunk = null;
foreach (var expr in expressions)
{
var evaluation = expr.Analyze(analyzer, ExInfoFromParent.DefaultExInfo);
// skip empty evaluated expressions
if (evaluation.HasValue &&
(
evaluation.Value == null ||
(evaluation.Value is string && ((string)evaluation.Value) == string.Empty) ||
Convert.ObjectToPhpBytes(evaluation.Value).Length == 0
))
{
continue; // empty literal => skip
}
// add chunk
if (lastChunk == null || lastChunk.HasValue != evaluation.HasValue)
{
chunks.Add(lastChunk = new ConcatChunk(evaluation));
}
else if (evaluation.HasValue)
{
lastChunk.Value = Operators.Concat(lastChunk.Value, evaluation.Value);
}
else//if (!evaluation.HasValue)
{
lastChunk.Expressions.Add(evaluation.Expression);
}
}
// there must be at least one expression
if (chunks.Count == 0)
chunks.Add(new ConcatChunk(string.Empty));
//
return chunks;
}
