Class: Mkxms::Mssql::IndentedStringBuilder

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/mkxms/mssql/indented_string_builder.rb

Defined Under Namespace

Classes: DSL, LineAccumulator

Constant Summary collapse

NAMED_SUBSTITUTIONS = 
/\{(?<name>\S+)\}/

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ IndentedStringBuilder

Returns a new instance of IndentedStringBuilder.



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# File 'lib/mkxms/mssql/indented_string_builder.rb', line 73

def initialize(options = {})
  @io = StringIO.new
  @indent = 0
  @each_indent = options.fetch(:each_indent, "  ")
end

Class Method Details

.dsl(&block) ⇒ Object 



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# File 'lib/mkxms/mssql/indented_string_builder.rb', line 185

def self.dsl(&block)
  new.dsl(&block).to_s
end

Instance Method Details

#dsl(&block) ⇒ Object 



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# File 'lib/mkxms/mssql/indented_string_builder.rb', line 180

def dsl(&block)
  DSL.for(self, block)
  return self
end

#each ⇒ Object 



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# File 'lib/mkxms/mssql/indented_string_builder.rb', line 189

def each
  @io.string.each_line {|l| yield l.chomp}
end

#indented(n = 1) ⇒ Object 



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# File 'lib/mkxms/mssql/indented_string_builder.rb', line 83

def indented(n = 1)
  prev_indent = @indent
  @indent += n
  begin
    yield
  ensure
    @indent = prev_indent
  end
end

#puts(s = "", options = {}) ⇒ Object 



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# File 'lib/mkxms/mssql/indented_string_builder.rb', line 93

def puts(s = "", options = {})
  sub_pattern = options.fetch(:sub, '%s')
  sub_pattern = NAMED_SUBSTITUTIONS if sub_pattern == :named
  if sub_pattern.nil?
    @io.puts(s)
    return s.each_line.lazy.map {|l| l.chomp}
  end
  
  sub_pattern = Regexp.compile(Regexp.escape(sub_pattern)) unless sub_pattern.is_a? Regexp
  sub_name_index = sub_pattern.named_captures.fetch('name', []).min
  scan_pattern = Regexp.union(sub_pattern, /\n|$/)
  current_indent = indent_string
  
  i = Enumerator.new {|y| v = 0; loop {y.yield(v); v += 1}}
  completed = 0

  lines = Enumerator.new do |e|
    if s.is_a? Range
      e.yield(current_indent + s.begin)
      body = yield
      hanging_indent = current_indent + @each_indent
      if body.is_a?(String) || !body.respond_to?(:each)
        body = body.to_s.each_line
      end
      body.each {|l| e.yield(hanging_indent + l.chomp)}
      e.yield(current_indent + s.end)
      next
    end
    
    line = LineAccumulator.new(current_indent) {|v| e.yield v}
    subbed_multiline = false
    s.scan(scan_pattern) do |m|
      chunk_range, completed = completed...$~.begin(0), $~.end(0)
      chunk_empty = !chunk_range.cover?(chunk_range.begin)
      
      case
      when m == "\n"
        (line << s[chunk_range]).flush if line.any_acculumation? || !chunk_empty
        next
      when m == "" && !chunk_empty
        (line << s[chunk_range]).flush
        next
      when m == ""
        line.flush if line.any_acculumation?
        next
      end
      
      # Expect repl is a string or an enumerator of lines
      prev_indent = @indent
      @indent += 1
      hanging_indent = indent_string
      begin
        yield_from_string = proc do |r|
          s_chunk = s[chunk_range]
          if r.include? "\n"
            line << s_chunk if line.any_acculumation? || !s_chunk.match(/^\s*$/)
            line.flush if line.any_acculumation?
            r.each_line {|l| e.yield(hanging_indent + l.chomp)}
          else
            line << s_chunk << r
          end
        end
        
        yield_args = []
        yield_args << m[sub_name_index - 1] if sub_name_index
        yield_args << i.next
        case repl = yield(*yield_args)
        when String
          yield_from_string[repl]
        when ->(v){v.respond_to? :each}
          (line << s[chunk_range]).flush
          repl.each {|l| e.yield(
            hanging_indent + 
            l.chomp.gsub("\n", hanging_indent + "\n")
          )}
        else
          yield_from_string[repl.to_s]
        end
      ensure
        @indent = prev_indent
      end
    end
  end
  
  lines.tap {|e| e.dup.each {|l| @io.puts l}}
end

#to_s ⇒ Object 



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# File 'lib/mkxms/mssql/indented_string_builder.rb', line 79

def to_s
  @io.string
end