Module: GraphQL::Language::BlockString

Defined in:
lib/graphql/language/block_string.rb

Class Method Summary collapse

Class Method Details



61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
 
# File 'lib/graphql/language/block_string.rb', line 61

def self.print(str, indent: '')
  line_length = 120 - indent.length
  block_str = "".dup
  triple_quotes = "\"\"\"\n"
  block_str << indent
  block_str << triple_quotes

  if str.include?("\n")
    str.split("\n") do |line|
      if line == ''
        block_str << "\n"
      else
        break_line(line, line_length) do |subline|
          block_str << indent
          block_str << subline
          block_str << "\n"
        end
      end
    end
  else
    break_line(str, line_length) do |subline|
      block_str << indent
      block_str << subline
      block_str << "\n"
    end
  end

  block_str << indent
  block_str << triple_quotes
end

.trim_whitespace(str) ⇒ Object

Remove leading and trailing whitespace from a block string. See "Block Strings" in https://github.com/facebook/graphql/blob/master/spec/Section%202%20--%20Language.md



7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
 
# File 'lib/graphql/language/block_string.rb', line 7

def self.trim_whitespace(str)
  # Early return for the most common cases:
  if str == ""
    return "".dup
  elsif !(has_newline = str.include?("\n")) && !(str.start_with?(" "))
    return str
  end

  lines = has_newline ? str.split("\n") : [str]
  common_indent = nil

  # find the common whitespace
  lines.each_with_index do |line, idx|
    if idx == 0
      next
    end
    line_length = line.size
    line_indent = if line.match?(/\A  [^ ]/)
      2
    elsif line.match?(/\A    [^ ]/)
      4
    elsif line.match?(/\A[^ ]/)
      0
    else
      line[/\A */].size
    end
    if line_indent < line_length && (common_indent.nil? || line_indent < common_indent)
      common_indent = line_indent
    end
  end

  # Remove the common whitespace
  if common_indent && common_indent > 0
    lines.each_with_index do |line, idx|
      if idx == 0
        next
      else
        line.slice!(0, common_indent)
      end
    end
  end

  # Remove leading & trailing blank lines
  while lines.size > 0 && contains_only_whitespace?(lines.first)
    lines.shift
  end
  while lines.size > 0 && contains_only_whitespace?(lines.last)
    lines.pop
  end

  # Rebuild the string
  lines.size > 1 ? lines.join("\n") : (lines.first || "".dup)
end