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66
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1 package yaml
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2
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3 import (
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4 "encoding/base64"
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5 "math"
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6 "regexp"
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7 "strconv"
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8 "strings"
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9 "time"
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10 )
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11
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12 type resolveMapItem struct {
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13 value interface{}
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14 tag string
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15 }
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16
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17 var resolveTable = make([]byte, 256)
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18 var resolveMap = make(map[string]resolveMapItem)
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19
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20 func init() {
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21 t := resolveTable
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22 t[int('+')] = 'S' // Sign
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23 t[int('-')] = 'S'
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24 for _, c := range "0123456789" {
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25 t[int(c)] = 'D' // Digit
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26 }
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27 for _, c := range "yYnNtTfFoO~" {
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28 t[int(c)] = 'M' // In map
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29 }
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30 t[int('.')] = '.' // Float (potentially in map)
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31
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32 var resolveMapList = []struct {
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33 v interface{}
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34 tag string
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35 l []string
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36 }{
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37 {true, yaml_BOOL_TAG, []string{"y", "Y", "yes", "Yes", "YES"}},
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38 {true, yaml_BOOL_TAG, []string{"true", "True", "TRUE"}},
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39 {true, yaml_BOOL_TAG, []string{"on", "On", "ON"}},
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40 {false, yaml_BOOL_TAG, []string{"n", "N", "no", "No", "NO"}},
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41 {false, yaml_BOOL_TAG, []string{"false", "False", "FALSE"}},
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42 {false, yaml_BOOL_TAG, []string{"off", "Off", "OFF"}},
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43 {nil, yaml_NULL_TAG, []string{"", "~", "null", "Null", "NULL"}},
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44 {math.NaN(), yaml_FLOAT_TAG, []string{".nan", ".NaN", ".NAN"}},
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45 {math.Inf(+1), yaml_FLOAT_TAG, []string{".inf", ".Inf", ".INF"}},
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46 {math.Inf(+1), yaml_FLOAT_TAG, []string{"+.inf", "+.Inf", "+.INF"}},
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47 {math.Inf(-1), yaml_FLOAT_TAG, []string{"-.inf", "-.Inf", "-.INF"}},
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48 {"<<", yaml_MERGE_TAG, []string{"<<"}},
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49 }
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50
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51 m := resolveMap
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52 for _, item := range resolveMapList {
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53 for _, s := range item.l {
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54 m[s] = resolveMapItem{item.v, item.tag}
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55 }
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56 }
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57 }
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58
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59 const longTagPrefix = "tag:yaml.org,2002:"
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60
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61 func shortTag(tag string) string {
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62 // TODO This can easily be made faster and produce less garbage.
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63 if strings.HasPrefix(tag, longTagPrefix) {
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64 return "!!" + tag[len(longTagPrefix):]
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65 }
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66 return tag
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67 }
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68
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69 func longTag(tag string) string {
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70 if strings.HasPrefix(tag, "!!") {
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71 return longTagPrefix + tag[2:]
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72 }
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73 return tag
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74 }
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75
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76 func resolvableTag(tag string) bool {
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77 switch tag {
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78 case "", yaml_STR_TAG, yaml_BOOL_TAG, yaml_INT_TAG, yaml_FLOAT_TAG, yaml_NULL_TAG, yaml_TIMESTAMP_TAG:
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79 return true
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80 }
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81 return false
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82 }
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83
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84 var yamlStyleFloat = regexp.MustCompile(`^[-+]?(\.[0-9]+|[0-9]+(\.[0-9]*)?)([eE][-+]?[0-9]+)?$`)
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85
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86 func resolve(tag string, in string) (rtag string, out interface{}) {
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87 if !resolvableTag(tag) {
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88 return tag, in
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89 }
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90
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91 defer func() {
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92 switch tag {
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93 case "", rtag, yaml_STR_TAG, yaml_BINARY_TAG:
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94 return
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95 case yaml_FLOAT_TAG:
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96 if rtag == yaml_INT_TAG {
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97 switch v := out.(type) {
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98 case int64:
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99 rtag = yaml_FLOAT_TAG
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100 out = float64(v)
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101 return
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102 case int:
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103 rtag = yaml_FLOAT_TAG
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104 out = float64(v)
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105 return
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106 }
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107 }
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108 }
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109 failf("cannot decode %s `%s` as a %s", shortTag(rtag), in, shortTag(tag))
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110 }()
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111
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112 // Any data is accepted as a !!str or !!binary.
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113 // Otherwise, the prefix is enough of a hint about what it might be.
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114 hint := byte('N')
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115 if in != "" {
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116 hint = resolveTable[in[0]]
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117 }
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118 if hint != 0 && tag != yaml_STR_TAG && tag != yaml_BINARY_TAG {
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119 // Handle things we can lookup in a map.
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120 if item, ok := resolveMap[in]; ok {
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121 return item.tag, item.value
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122 }
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123
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124 // Base 60 floats are a bad idea, were dropped in YAML 1.2, and
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125 // are purposefully unsupported here. They're still quoted on
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126 // the way out for compatibility with other parser, though.
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127
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128 switch hint {
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129 case 'M':
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130 // We've already checked the map above.
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131
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132 case '.':
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133 // Not in the map, so maybe a normal float.
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134 floatv, err := strconv.ParseFloat(in, 64)
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135 if err == nil {
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136 return yaml_FLOAT_TAG, floatv
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137 }
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138
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139 case 'D', 'S':
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140 // Int, float, or timestamp.
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141 // Only try values as a timestamp if the value is unquoted or there's an explicit
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142 // !!timestamp tag.
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143 if tag == "" || tag == yaml_TIMESTAMP_TAG {
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144 t, ok := parseTimestamp(in)
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145 if ok {
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146 return yaml_TIMESTAMP_TAG, t
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147 }
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148 }
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149
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150 plain := strings.Replace(in, "_", "", -1)
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151 intv, err := strconv.ParseInt(plain, 0, 64)
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152 if err == nil {
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153 if intv == int64(int(intv)) {
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154 return yaml_INT_TAG, int(intv)
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155 } else {
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156 return yaml_INT_TAG, intv
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157 }
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158 }
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159 uintv, err := strconv.ParseUint(plain, 0, 64)
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160 if err == nil {
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161 return yaml_INT_TAG, uintv
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162 }
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163 if yamlStyleFloat.MatchString(plain) {
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164 floatv, err := strconv.ParseFloat(plain, 64)
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165 if err == nil {
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166 return yaml_FLOAT_TAG, floatv
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167 }
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168 }
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169 if strings.HasPrefix(plain, "0b") {
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170 intv, err := strconv.ParseInt(plain[2:], 2, 64)
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171 if err == nil {
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172 if intv == int64(int(intv)) {
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173 return yaml_INT_TAG, int(intv)
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174 } else {
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175 return yaml_INT_TAG, intv
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176 }
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177 }
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178 uintv, err := strconv.ParseUint(plain[2:], 2, 64)
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179 if err == nil {
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180 return yaml_INT_TAG, uintv
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181 }
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182 } else if strings.HasPrefix(plain, "-0b") {
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183 intv, err := strconv.ParseInt("-" + plain[3:], 2, 64)
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184 if err == nil {
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185 if true || intv == int64(int(intv)) {
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186 return yaml_INT_TAG, int(intv)
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187 } else {
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188 return yaml_INT_TAG, intv
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189 }
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190 }
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191 }
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192 default:
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193 panic("resolveTable item not yet handled: " + string(rune(hint)) + " (with " + in + ")")
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194 }
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195 }
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196 return yaml_STR_TAG, in
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197 }
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198
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199 // encodeBase64 encodes s as base64 that is broken up into multiple lines
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200 // as appropriate for the resulting length.
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201 func encodeBase64(s string) string {
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202 const lineLen = 70
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203 encLen := base64.StdEncoding.EncodedLen(len(s))
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204 lines := encLen/lineLen + 1
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205 buf := make([]byte, encLen*2+lines)
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206 in := buf[0:encLen]
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207 out := buf[encLen:]
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208 base64.StdEncoding.Encode(in, []byte(s))
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209 k := 0
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210 for i := 0; i < len(in); i += lineLen {
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211 j := i + lineLen
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212 if j > len(in) {
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213 j = len(in)
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214 }
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215 k += copy(out[k:], in[i:j])
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216 if lines > 1 {
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217 out[k] = '\n'
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218 k++
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219 }
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220 }
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221 return string(out[:k])
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222 }
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223
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224 // This is a subset of the formats allowed by the regular expression
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225 // defined at http://yaml.org/type/timestamp.html.
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226 var allowedTimestampFormats = []string{
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227 "2006-1-2T15:4:5.999999999Z07:00", // RCF3339Nano with short date fields.
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228 "2006-1-2t15:4:5.999999999Z07:00", // RFC3339Nano with short date fields and lower-case "t".
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229 "2006-1-2 15:4:5.999999999", // space separated with no time zone
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230 "2006-1-2", // date only
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231 // Notable exception: time.Parse cannot handle: "2001-12-14 21:59:43.10 -5"
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232 // from the set of examples.
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233 }
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234
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235 // parseTimestamp parses s as a timestamp string and
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236 // returns the timestamp and reports whether it succeeded.
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237 // Timestamp formats are defined at http://yaml.org/type/timestamp.html
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238 func parseTimestamp(s string) (time.Time, bool) {
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239 // TODO write code to check all the formats supported by
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240 // http://yaml.org/type/timestamp.html instead of using time.Parse.
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241
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242 // Quick check: all date formats start with YYYY-.
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243 i := 0
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244 for ; i < len(s); i++ {
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245 if c := s[i]; c < '0' || c > '9' {
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246 break
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247 }
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248 }
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249 if i != 4 || i == len(s) || s[i] != '-' {
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250 return time.Time{}, false
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251 }
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252 for _, format := range allowedTimestampFormats {
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253 if t, err := time.Parse(format, s); err == nil {
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254 return t, true
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255 }
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256 }
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257 return time.Time{}, false
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258 }
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