author | Mikael Berthe <mikael@lilotux.net> |
Thu, 22 Sep 2022 16:32:45 +0200 | |
changeset 261 | 270cc4dda0c5 |
parent 242 | 2a9ec03fe5a1 |
permissions | -rw-r--r-- |
242
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1 |
package yaml |
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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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// The size of the input buffer. |
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// 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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// 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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// 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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// 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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// 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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// 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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// 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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// 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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// 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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Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
118 |
b[i] == '\r' || // CR (#xD) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
119 |
b[i] == '\n' || // LF (#xA) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
120 |
b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
121 |
b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
122 |
b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9 || // PS (#x2029) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
123 |
// is_z: |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
124 |
b[i] == 0) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
125 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
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changeset
|
126 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
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parents:
diff
changeset
|
127 |
// Check if the character is a line break, space, or NUL. |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
128 |
func is_spacez(b []byte, i int) bool { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
129 |
//return is_space(b, i) || is_breakz(b, i) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
130 |
return ( // is_space: |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
131 |
b[i] == ' ' || |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
132 |
// is_breakz: |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
133 |
b[i] == '\r' || // CR (#xD) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
134 |
b[i] == '\n' || // LF (#xA) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
135 |
b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
136 |
b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
137 |
b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9 || // PS (#x2029) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
138 |
b[i] == 0) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
139 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
140 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
141 |
// Check if the character is a line break, space, tab, or NUL. |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
142 |
func is_blankz(b []byte, i int) bool { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
143 |
//return is_blank(b, i) || is_breakz(b, i) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
144 |
return ( // is_blank: |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
145 |
b[i] == ' ' || b[i] == '\t' || |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
146 |
// is_breakz: |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
147 |
b[i] == '\r' || // CR (#xD) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
148 |
b[i] == '\n' || // LF (#xA) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
149 |
b[i] == 0xC2 && b[i+1] == 0x85 || // NEL (#x85) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
150 |
b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA8 || // LS (#x2028) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
151 |
b[i] == 0xE2 && b[i+1] == 0x80 && b[i+2] == 0xA9 || // PS (#x2029) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
152 |
b[i] == 0) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
153 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
154 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
155 |
// Determine the width of the character. |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
156 |
func width(b byte) int { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
157 |
// Don't replace these by a switch without first |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
158 |
// confirming that it is being inlined. |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
159 |
if b&0x80 == 0x00 { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
160 |
return 1 |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
161 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
162 |
if b&0xE0 == 0xC0 { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
163 |
return 2 |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
164 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
165 |
if b&0xF0 == 0xE0 { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
166 |
return 3 |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
167 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
168 |
if b&0xF8 == 0xF0 { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
169 |
return 4 |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
170 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
171 |
return 0 |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
172 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
173 |
} |