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66
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1 package yaml
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2
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3 const (
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4 // The size of the input raw buffer.
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5 input_raw_buffer_size = 512
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6
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7 // The size of the input buffer.
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8 // It should be possible to decode the whole raw buffer.
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9 input_buffer_size = input_raw_buffer_size * 3
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10
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11 // The size of the output buffer.
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12 output_buffer_size = 128
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13
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14 // The size of the output raw buffer.
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15 // It should be possible to encode the whole output buffer.
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16 output_raw_buffer_size = (output_buffer_size*2 + 2)
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17
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18 // The size of other stacks and queues.
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19 initial_stack_size = 16
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20 initial_queue_size = 16
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21 initial_string_size = 16
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22 )
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23
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24 // Check if the character at the specified position is an alphabetical
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25 // character, a digit, '_', or '-'.
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26 func is_alpha(b []byte, i int) bool {
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27 return b[i] >= '0' && b[i] <= '9' || b[i] >= 'A' && b[i] <= 'Z' || b[i] >= 'a' && b[i] <= 'z' || b[i] == '_' || b[i] == '-'
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28 }
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29
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30 // Check if the character at the specified position is a digit.
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31 func is_digit(b []byte, i int) bool {
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32 return b[i] >= '0' && b[i] <= '9'
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33 }
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34
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35 // Get the value of a digit.
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36 func as_digit(b []byte, i int) int {
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37 return int(b[i]) - '0'
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38 }
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39
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40 // Check if the character at the specified position is a hex-digit.
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41 func is_hex(b []byte, i int) bool {
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42 return b[i] >= '0' && b[i] <= '9' || b[i] >= 'A' && b[i] <= 'F' || b[i] >= 'a' && b[i] <= 'f'
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43 }
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44
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45 // Get the value of a hex-digit.
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46 func as_hex(b []byte, i int) int {
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47 bi := b[i]
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48 if bi >= 'A' && bi <= 'F' {
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49 return int(bi) - 'A' + 10
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50 }
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51 if bi >= 'a' && bi <= 'f' {
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52 return int(bi) - 'a' + 10
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53 }
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54 return int(bi) - '0'
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55 }
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56
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57 // Check if the character is ASCII.
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58 func is_ascii(b []byte, i int) bool {
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59 return b[i] <= 0x7F
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60 }
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61
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62 // Check if the character at the start of the buffer can be printed unescaped.
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63 func is_printable(b []byte, i int) bool {
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64 return ((b[i] == 0x0A) || // . == #x0A
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65 (b[i] >= 0x20 && b[i] <= 0x7E) || // #x20 <= . <= #x7E
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66 (b[i] == 0xC2 && b[i+1] >= 0xA0) || // #0xA0 <= . <= #xD7FF
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67 (b[i] > 0xC2 && b[i] < 0xED) ||
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68 (b[i] == 0xED && b[i+1] < 0xA0) ||
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69 (b[i] == 0xEE) ||
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70 (b[i] == 0xEF && // #xE000 <= . <= #xFFFD
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71 !(b[i+1] == 0xBB && b[i+2] == 0xBF) && // && . != #xFEFF
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72 !(b[i+1] == 0xBF && (b[i+2] == 0xBE || b[i+2] == 0xBF))))
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73 }
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74
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75 // Check if the character at the specified position is NUL.
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76 func is_z(b []byte, i int) bool {
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77 return b[i] == 0x00
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78 }
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79
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80 // Check if the beginning of the buffer is a BOM.
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81 func is_bom(b []byte, i int) bool {
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82 return b[0] == 0xEF && b[1] == 0xBB && b[2] == 0xBF
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83 }
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84
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85 // Check if the character at the specified position is space.
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86 func is_space(b []byte, i int) bool {
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87 return b[i] == ' '
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88 }
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89
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90 // Check if the character at the specified position is tab.
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91 func is_tab(b []byte, i int) bool {
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92 return b[i] == '\t'
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93 }
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94
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95 // Check if the character at the specified position is blank (space or tab).
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96 func is_blank(b []byte, i int) bool {
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97 //return is_space(b, i) || is_tab(b, i)
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98 return b[i] == ' ' || b[i] == '\t'
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99 }
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100
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101 // Check if the character at the specified position is a line break.
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102 func is_break(b []byte, i int) bool {
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103 return (b[i] == '\r' || // CR (#xD)
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104 b[i] == '\n' || // LF (#xA)
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105 b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85)
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106 b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028)
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107 b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9) // PS (#x2029)
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108 }
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109
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110 func is_crlf(b []byte, i int) bool {
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111 return b[i] == '\r' && b[i+1] == '\n'
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112 }
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113
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114 // Check if the character is a line break or NUL.
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115 func is_breakz(b []byte, i int) bool {
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116 //return is_break(b, i) || is_z(b, i)
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117 return ( // is_break:
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118 b[i] == '\r' || // CR (#xD)
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119 b[i] == '\n' || // LF (#xA)
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120 b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85)
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121 b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028)
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122 b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9 || // PS (#x2029)
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123 // is_z:
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124 b[i] == 0)
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125 }
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126
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127 // Check if the character is a line break, space, or NUL.
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128 func is_spacez(b []byte, i int) bool {
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129 //return is_space(b, i) || is_breakz(b, i)
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130 return ( // is_space:
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131 b[i] == ' ' ||
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132 // is_breakz:
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133 b[i] == '\r' || // CR (#xD)
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134 b[i] == '\n' || // LF (#xA)
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135 b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85)
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136 b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028)
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137 b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9 || // PS (#x2029)
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138 b[i] == 0)
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139 }
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140
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141 // Check if the character is a line break, space, tab, or NUL.
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142 func is_blankz(b []byte, i int) bool {
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143 //return is_blank(b, i) || is_breakz(b, i)
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144 return ( // is_blank:
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145 b[i] == ' ' || b[i] == '\t' ||
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146 // is_breakz:
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147 b[i] == '\r' || // CR (#xD)
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148 b[i] == '\n' || // LF (#xA)
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149 b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85)
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150 b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028)
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151 b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9 || // PS (#x2029)
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152 b[i] == 0)
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153 }
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154
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155 // Determine the width of the character.
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156 func width(b byte) int {
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157 // Don't replace these by a switch without first
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158 // confirming that it is being inlined.
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159 if b&0x80 == 0x00 {
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160 return 1
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161 }
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162 if b&0xE0 == 0xC0 {
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163 return 2
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164 }
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165 if b&0xF0 == 0xE0 {
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166 return 3
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167 }
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168 if b&0xF8 == 0xF0 {
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169 return 4
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170 }
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171 return 0
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172
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173 }
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