源代码映射

• SourceName 解读
  • SourceNameNode
  • SourceName
• 解读 Span
  • SpanNode
  • Span
  • SequentialSpanNode
  • SequentialSpan
• 解读 Source
  • SourceNode
  • Source
• 解读 SourceMap
  • SourceMapNode
  • SourceMap