internal static List <SourceMapMappingEntry> ParseMappings(string mappings, List <string> names, List <string> sources)
{
var result = new List <SourceMapMappingEntry>();
var state = new MappingParserState();
var lines = mappings.Split(';');
for (var lineNumber = 0; lineNumber < lines.Length; lineNumber++)
{
state.GeneratedLineNumber = lineNumber;
state.GeneratedColumnNumber = 0;
var segments = lines[lineNumber].Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
foreach (var segment in segments)
{
ApplyMappingSegment(Base64Vlq.Decode(segment), ref state);
result.Add(state.GetCurrentSourceMapMappingEntry(names, sources));
}
}
return(result);
}
internal static void ApplyMappingSegment(List <int> segmentFields, ref MappingParserState state)
{
_ = segmentFields ?? throw new ArgumentNullException(nameof(segmentFields));
if (segmentFields.Count != 1 && segmentFields.Count != 4 && segmentFields.Count != 5)
{
throw new ArgumentOutOfRangeException(nameof(segmentFields), $"Expected 1, 4 or 5 decoded segments, got {segmentFields.Count}");
}
state.SegmentCount = segmentFields.Count;
state.GeneratedColumnNumber += segmentFields[0];
if (state.ContainsSourceLocation)
{
state.SourcesListIndex += segmentFields[1];
state.OriginalLineNumber += segmentFields[2];
state.OriginalColumnNumber += segmentFields[3];
}
if (state.ContainsOriginalName)
{
state.NamesListIndex += segmentFields[4];
}
}