1 | module JSON
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2 | def self.dump(object, io=nil, limit=nil)
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3 | state = {}
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4 | state[:max_nesting] = limit if limit
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5 | begin
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6 | js = JSON.generate(object, nil, state)
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7 | rescue JSON::NestingError
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8 | raise ArgumentError, "exceeded depth limit"
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9 | end
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10 | if io
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11 | io.write js
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12 | io
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13 | else
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14 | js
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15 | end
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16 | end
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17 |
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18 | def self.generate(obj, options=nil, state=nil)
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19 | options = (options || {}).to_hash unless options.is_a? Hash
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20 | options[:pretty_print] ||= false
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21 | options[:indent_with] ||= 2
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22 | state = (state || {}).to_hash unless state.is_a? Hash
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23 | state[:max_nesting] ||= 100
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24 | state[:nesting] = 0
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25 | self.generate0(obj, options, state)
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26 | end
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27 |
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28 | def self.generate0(obj, options, state)
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29 | if state[:nesting] >= state[:max_nesting]
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30 | raise JSON::NestingError, "nesting of #{state[:nesting]} is too deep"
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31 | end
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32 |
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33 | pretty = options[:pretty_print]
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34 |
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35 | if pretty
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36 | indent = options[:indent_with].class == Fixnum ? " " * options[:indent_with] : options[:indent_with]
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37 | else
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38 | indent = ""
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39 | end
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40 |
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41 | nl = pretty ? "\n" : ""
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42 |
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43 | if obj == false
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44 | return "false"
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45 |
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46 | elsif obj == nil
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47 | return "null"
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48 |
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49 | elsif obj == true
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50 | return "true"
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51 |
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52 | elsif obj.is_a? Hash
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53 | members = []
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54 | state[:nesting] += 1
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55 | obj.each { |k, v|
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56 | members << JSON.generate0(k, options, state) + ":" + (pretty ? " " : "") + JSON.generate0(v, options, state)
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57 | }
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58 | if pretty
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59 | members.map! { |k| (indent * state[:nesting]) + "#{k}" }.join("_")
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60 | end
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61 | state[:nesting] -= 1
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62 | return "{" + nl + members.join("," + nl) + nl + (indent * state[:nesting]) + "}"
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63 |
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64 | elsif obj.is_a? Array
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65 | state[:nesting] += 1
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66 | members = obj.map { |v| JSON.generate0(v, options, state) }
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67 | if pretty
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68 | members.map! { |k| (indent * state[:nesting]) + "#{k}" }.join("_")
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69 | end
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70 | state[:nesting] -= 1
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71 | return "[" + nl + members.join("," + nl) + nl + (indent * state[:nesting]) + "]"
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72 |
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73 | elsif obj.is_a? Fixnum
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74 | return obj.to_s
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75 |
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76 | elsif obj.is_a? Float
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77 | if obj.infinite? or obj.nan?
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78 | raise GeneratorError, "#{obj.to_s} not allowed in JSON"
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79 | end
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80 | sprintf "%.17g", obj
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81 |
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82 | else
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83 | a = []
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84 | obj.to_s.each_char { |ch|
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85 | a << if ch < "\x20"
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86 | case ch
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87 | when "\x08"
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88 | "\\b"
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89 | when "\x0c"
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90 | "\\f"
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91 | when "\x0a"
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92 | "\\n"
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93 | when "\x0d"
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94 | "\\r"
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95 | when "\x09"
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96 | "\\t"
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97 | else
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98 | raise GeneratorError, "cannot convert #{ch.inspect} to JSON"
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99 | end
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100 | elsif ch == '"'
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101 | '\\"'
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102 | elsif ch == '\\'
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103 | "\\\\"
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104 | else
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105 | ch
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106 | end
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107 | }
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108 | return '"' + a.join + '"'
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109 | end
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110 | end
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111 |
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112 | def self.load(source) # TODO: proc, options
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113 | source = source.read unless source.is_a? String
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114 | JSON.parse source
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115 | end
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116 |
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117 | class JSONError < StandardError; end
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118 | class GeneratorError < JSONError; end
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119 | class ParserError < JSONError; end
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120 | class NestingError < ParserError; end
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121 | end
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122 |
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123 | unless Float.method_defined? :nan?
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124 | class Float
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125 | def nan?
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126 | not (self == self)
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127 | end
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128 | end
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129 | end
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