1 | // -*- c++ -*- // |
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2 | |
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3 | #ifndef HUGO_ITER_MAP |
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4 | #define HUGO_ITER_MAP |
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5 | |
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6 | #include <vector> |
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7 | #include <algorithm> |
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8 | // for uint8_t |
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9 | #include <stdint.h> |
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10 | // for memset |
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11 | #include <cstring> |
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12 | |
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13 | #include <hugo/invalid.h> |
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14 | |
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15 | namespace hugo { |
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16 | |
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17 | /// \brief A map with "small integers" as value set which can enumarate it |
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18 | /// value classes |
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19 | |
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20 | /// \todo Decide whether we need all the range checkings!!! |
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21 | |
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22 | /// \todo Implement dynamic map behaviour. Is it necessary? Yes it is. |
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23 | |
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24 | template<typename KeyIntMap, uint8_t N, typename Val = uint8_t> |
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25 | class IterableMap { |
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26 | public: |
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27 | |
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28 | typedef typename KeyIntMap::KeyType KeyType; |
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29 | typedef Val ValueType; |
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30 | |
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31 | typedef typename std::vector<KeyType>::const_iterator iterator; |
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32 | |
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33 | protected: |
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34 | KeyIntMap &base; |
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35 | std::vector<KeyType> data; |
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36 | size_t bounds[N]; |
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37 | Val def_val; |
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38 | |
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39 | Val find(size_t a) const { |
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40 | for(uint8_t n=0; n<N; ++n) { |
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41 | if(bounds[n] > a) |
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42 | return n; |
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43 | } |
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44 | return def_val; |
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45 | } |
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46 | |
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47 | void half_swap(size_t &a, size_t b) { |
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48 | if(a != b) { |
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49 | base.set(data[b],a); |
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50 | data[a] = data[b]; |
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51 | a = b; |
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52 | } |
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53 | } |
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54 | |
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55 | size_t move(size_t a, uint8_t m, uint8_t n) { |
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56 | if(m != n) { |
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57 | size_t orig_a = a; |
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58 | KeyType orig_key = data[a]; |
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59 | while(m > n) { |
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60 | --m; |
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61 | half_swap(a, bounds[m]++); |
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62 | } |
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63 | // FIXME: range check ide? |
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64 | while(m < n) { |
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65 | half_swap(a, --bounds[m]); |
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66 | ++m; |
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67 | } |
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68 | if(a != orig_a) { |
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69 | base.set(orig_key, a); |
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70 | data[a]=orig_key; |
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71 | } |
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72 | } |
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73 | return a; |
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74 | } |
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75 | |
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76 | public: |
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77 | |
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78 | IterableMap(KeyIntMap &_base, Val d = N+1) : base(_base), def_val(d) { |
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79 | memset(bounds, 0, sizeof(bounds)); |
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80 | // for(int i=0; i<N; ++i) { bounds[i]=0; } |
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81 | } |
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82 | |
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83 | Val operator[](const KeyType& k) const { |
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84 | return find(base[k]); |
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85 | } |
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86 | |
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87 | void set(const KeyType& k, Val n) { |
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88 | // FIXME: range check? |
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89 | size_t a = base[k]; |
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90 | if(a < bounds[N-1]) { |
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91 | move(a, find(a), n); |
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92 | } |
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93 | else { |
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94 | insert(k, n); |
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95 | } |
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96 | } |
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97 | |
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98 | void insert(const KeyType& k, Val n) { |
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99 | data.push_back(k); |
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100 | base.set(k, move(bounds[N-1]++, N-1, n)); |
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101 | } |
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102 | |
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103 | /// This func is not very usable, but necessary to implement |
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104 | /// dynamic map behaviour. |
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105 | void remove(const KeyType& k) { |
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106 | size_t a = base[k]; |
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107 | if(a < bounds[N-1]) { |
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108 | move(a, find(a), N); |
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109 | data.pop_back(); |
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110 | base.set(k, -1); |
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111 | } |
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112 | } |
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113 | |
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114 | iterator begin(Val n) const { |
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115 | return data.begin() + (n ? bounds[n-1] : 0); |
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116 | } |
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117 | |
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118 | iterator end(Val n) const { |
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119 | return data.begin() + bounds[n]; |
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120 | } |
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121 | |
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122 | size_t size(Val n) const { |
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123 | return bounds[n] - (n ? bounds[n-1] : 0); |
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124 | } |
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125 | |
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126 | size_t size() const { |
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127 | // assert(bounds[N-1] == data.size()); |
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128 | return bounds[N-1]; |
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129 | } |
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130 | |
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131 | |
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132 | /// For use as an iterator... |
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133 | KeyType& first(KeyType &k, Val n) { |
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134 | size_t i = (n ? bounds[n-1] : 0); |
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135 | if( i < bounds[n] ) { |
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136 | k = data[i]; |
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137 | } |
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138 | else { |
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139 | k = INVALID; |
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140 | } |
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141 | return k; |
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142 | } |
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143 | |
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144 | /// For use as an iterator... |
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145 | KeyType& next(KeyType &k) { |
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146 | size_t i = base[k]; |
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147 | uint8_t n = find(i); |
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148 | ++i; |
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149 | if( i < bounds[n] ) { |
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150 | k = data[i]; |
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151 | } |
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152 | else { |
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153 | k = INVALID; |
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154 | } |
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155 | return k; |
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156 | } |
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157 | |
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158 | }; |
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159 | |
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160 | |
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161 | |
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162 | |
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163 | template<typename KeyIntMap> |
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164 | class IterableBoolMap : public IterableMap<KeyIntMap, 2, bool> { |
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165 | typedef IterableMap<KeyIntMap, 2, bool> Parent; |
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166 | |
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167 | public: |
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168 | IterableBoolMap(KeyIntMap &_base, bool d = false) : Parent(_base, d) {} |
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169 | }; |
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170 | |
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171 | } |
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172 | #endif |
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