Class: Glslkit::Preprocessor

Inherits:
Object
  • Object
show all
Defined in:
lib/glslkit/preprocessor.rb

Constant Summary collapse

INCLUDE_PATTERN = 
/\A[ \t]*#[ \t]*include[ \t]*(?:"([^"]+)"|<([^>]+)>)[ \t]*\z/
VERSION_PATTERN = 
/\A[ \t]*#[ \t]*version\b/
EXTENSION_PATTERN = 
/\A[ \t]*#[ \t]*extension\b/
PRAGMA_ONCE_PATTERN = 
/\A[ \t]*#[ \t]*pragma[ \t]+once[ \t]*\z/

Instance Method Summary collapse

Constructor Details

#initialize(resolver:, line_directives: true) ⇒ Preprocessor

Returns a new instance of Preprocessor.



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# File 'lib/glslkit/preprocessor.rb', line 17

def initialize(resolver:, line_directives: true)
  @resolver = resolver
  @line_directives = line_directives
end

Instance Method Details

#process(entry_request) ⇒ Object 



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# File 'lib/glslkit/preprocessor.rb', line 22

def process(entry_request)
  run = Run.new
  canonical_path, content = @resolver.read(entry_request, from: nil)
  expand(run, canonical_path, content)

  header = []
  header << run.version if run.version
  header.concat(run.extensions)

  code = "#{(header + run.body).join("\n")}\n"

  # segmentsはbody基準(ヘッダを含まない)の行番号で溜めてあるので、
  # ヘッダの行数だけ一括でずらしてからSourceMapに登録する。ヘッダの
  # 行数はexpand()完了まで確定しない(#versionがどのファイルで見つかる
  # かは走査してみないと分からない)ため、この2段階が必要になる。
  run.segments.each do |body_line, file_index, source_line|
    run.source_map.add_segment(output_line: header.size + body_line, file_index: file_index, source_line: source_line)
  end

  Source.new(
    code: code,
    source_map: run.source_map,
    reflection: Reflection.new(code),
    digest: Digest.hexdigest(code)
  )
end