Module: Canopus::Language::SyntaxWorker

Defined in:
lib/canopus/language/syntax_worker.rb

Overview

Fixed ProcessPool handler. This state never lives on the UI thread.

Constant Summary collapse

MAX_DOCUMENTS = 
4
MAX_CACHE_BYTES = 
4 << 20
MAX_SYMBOLS = 
10_000
MAX_BRACKETS = 
8192
MAX_SELECTIONS = 
256
MAX_SELECTION_RANGES = 
10_000

Class Method Summary collapse

Class Method Details

.analyze(document, base, base_line, complete) ⇒ Object 



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# File 'lib/canopus/language/syntax_worker.rb', line 120

def self.analyze(document, base, base_line, complete)
  all_symbols = document.outline
  outline = all_symbols.first(MAX_SYMBOLS).map do |symbol|
    [symbol.name, symbol.kind.to_s, base + symbol.range.begin, base + symbol.range.end,
      base + symbol.selection.begin, base + symbol.selection.end, symbol.depth]
  end
  diagnostics = complete ? document.diagnostics.first(1000).map { |item| [base + item[:range].begin, base + item[:range].end, item[:message]] } : []
  all_brackets = document.brackets
  brackets = all_brackets.first(MAX_BRACKETS).map do |pair|
    [base + pair.open_range.begin, base + pair.open_range.end, base_line + pair.open_row,
      base + pair.close_range.begin, base + pair.close_range.end, base_line + pair.close_row, pair.depth]
  end
  all_regions = document.structure_regions
  structure_regions = all_regions.first(MAX_SYMBOLS).map do |region|
    [base_line + region[:start_line], base_line + region[:end_line], region[:kind].to_s]
  end
  folds = document.fold_ranges.first(MAX_SYMBOLS).map { |range| [base + range.begin, base + range.end] }
  {"outline" => outline, "diagnostics" => diagnostics, "brackets" => brackets,
    "structure_regions" => structure_regions, "folds" => folds,
    "truncated" => all_symbols.length > MAX_SYMBOLS || all_brackets.length > MAX_BRACKETS ||
      all_regions.length > MAX_SYMBOLS || (complete && document.diagnostics.length > 1000)}
end

.call(request) ⇒ Object 



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# File 'lib/canopus/language/syntax_worker.rb', line 23

def self.call(request)
  source = request.fetch("source")
  unless source.is_a?(String) && source.valid_encoding? && source.encoding == Encoding::UTF_8 && source.bytesize <= BackgroundAnalysis::SOURCE_LIMIT
    raise ArgumentError, "language snapshot must be bounded UTF-8"
  end
  first_row, last_row, base_line, base = request.values_at("first", "last", "base_line", "base")
  unless [first_row, last_row, base_line, base].all? { |value| value.is_a?(Integer) && value >= 0 } &&
      base_line <= first_row && last_row >= first_row && last_row - first_row < BackgroundAnalysis::ROW_LIMIT
    raise ArgumentError, "language token range exceeds limit"
  end
  @documents ||= {}
  key = [request.fetch("id"), base, request.fetch("name"), request.fetch("lexer"), request.fetch("complete")]
  cached = @documents.delete(key)
  if cached
    buffer, document, previous = cached
    update(buffer, previous, source) unless previous == source
  else
    buffer = Buffer.new(source)
    definition = Language::Definition.new(request.fetch("name"), request.fetch("lexer"), [], "", /\A\z/, /\A\z/, [])
    document = Document.new(buffer, definition: definition, background: false)
  end
  @documents[key] = [buffer, document, source]
  while @documents.length > MAX_DOCUMENTS || @documents.values.sum { |entry| entry[2].bytesize } > MAX_CACHE_BYTES
    _, discarded = @documents.shift
    discarded[1].dispose
  end
  first = request.fetch("first") - request.fetch("base_line")
  last = [request.fetch("last") - request.fetch("base_line"), buffer.line_count - 1].min
  highlighter = document.highlighter(strategy: request.fetch("complete") ? nil : :window,
    window_context: request.fetch("complete") ? nil : request.fetch("context"),
    max_seconds: request.fetch("complete") ? 2 : nil)
  rows = first <= last ? highlighter.tokens_in(first..last) : []
  budget = 65_536
  tokens = (request.fetch("first")..request.fetch("last")).map.with_index do |row, index|
    pairs = rows[index] || []
    if pairs.length > 4096 || pairs.length > budget || pairs.sum { |_, text| text.bytesize } > BackgroundAnalysis::LINE_LIMIT
      local = row - request.fetch("base_line")
      plain = local < buffer.line_count ? BackgroundAnalysis.line(buffer.rope, local) : ""
      values = [["Text", plain]]
    else
      values = pairs.map { |token, text| [token.qualname, text] }
    end
    budget -= values.length
    [row, values]
  end
  selections = selection_ranges(document, buffer, request)
  syntax = analyze(document, request.fetch("base"), request.fetch("base_line"), request.fetch("complete")) if request.fetch("syntax")
  complete = request.fetch("complete") && (!syntax || !syntax.delete("truncated"))
  {"tokens" => tokens, "syntax" => syntax, "selections" => selections, "complete" => complete}
end

.selection_ranges(document, buffer, request) ⇒ Object 



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# File 'lib/canopus/language/syntax_worker.rb', line 87

def self.selection_ranges(document, buffer, request)
  positions = request.fetch("selections", [])
  seen = {}
  unless positions.is_a?(Array) && positions.length <= MAX_SELECTIONS && positions.all? do |value|
    value.is_a?(Array) && value.length == 3 && value[0].is_a?(Integer) && value[0].between?(0, MAX_SELECTIONS - 1) &&
      !seen[value[0]] && (seen[value[0]] = true) && value.drop(1).all? { |item| item.is_a?(Integer) && item >= 0 }
  end
    raise ArgumentError, "invalid selection positions"
  end

  total = 0
  positions.map do |index, row, column|
    local_row = row - request.fetch("base_line")
    point = Denebola::Point.new(local_row, column)
    cursor = buffer.rope.offset_at(point)
    candidates = document.highlighter.structure.selection_ranges(local_row, column).map do |region|
      first = buffer.rope.offset_at(Denebola::Point.new(region.start_line, region.start_column || 0))
      last = buffer.rope.offset_at(Denebola::Point.new(region.end_line,
        region.end_column || buffer.line(region.end_line).length))
      [first, last]
    end.uniq.sort_by { |first, last| [last - first, -first] }
    ranges = candidates.each_with_object([]) do |(first, last), nested|
      next unless first <= cursor && cursor <= last
      next if nested.last && !(first <= nested.last[0] && nested.last[1] <= last)
      total += 1
      raise Error, "too many Antares selection ranges" if total > MAX_SELECTION_RANGES
      nested << [first, last]
    end
    raise Error, "Antares selection range is too deep" if ranges.length > MAX_SELECTIONS
    [index, ranges.map { |first, last| [request.fetch("base") + first, request.fetch("base") + last] }]
  end
end

.update(buffer, previous, source) ⇒ Object 



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# File 'lib/canopus/language/syntax_worker.rb', line 74

def self.update(buffer, previous, source)
  first, shared = 0, [previous.bytesize, source.bytesize].min
  first += 4096 while first + 4096 <= shared && previous.byteslice(first, 4096) == source.byteslice(first, 4096)
  first += 1 while first < shared && previous.getbyte(first) == source.getbyte(first)
  first -= 1 while first.positive? && previous.getbyte(first)&.&(0xc0) == 0x80
  tail = 0
  tail += 4096 while tail + 4096 <= shared - first && previous.byteslice(previous.bytesize - tail - 4096, 4096) == source.byteslice(source.bytesize - tail - 4096, 4096)
  tail += 1 while tail < shared - first && previous.getbyte(previous.bytesize - tail - 1) == source.getbyte(source.bytesize - tail - 1)
  tail -= 1 while tail.positive? && previous.getbyte(previous.bytesize - tail)&.&(0xc0) == 0x80
  buffer.edit([[first...(previous.bytesize - tail), source.byteslice(first, source.bytesize - first - tail)]])
  buffer.history.clear
end