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407
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1 package IMPL::lang;
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2 use strict;
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3 use warnings;
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4
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5 use parent qw(Exporter);
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6 use IMPL::_core::version;
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7 use IMPL::clone qw(clone);
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8 use Scalar::Util qw(blessed);
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408
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9 use POSIX;
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407
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10 use Carp qw(carp);
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11
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408
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12 our @EXPORT = qw(&is &isclass &typeof &coarsen);
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407
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13 our %EXPORT_TAGS = (
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14 base => [
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15 qw(
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16 &is
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17 &clone
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18 &isclass
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19 &typeof
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20 )
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21 ],
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22
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23 declare => [
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24 qw(
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25 &public
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26 &protected
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27 &private
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28 &property
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29 &static
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30 &property
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31 &_direct
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32 &ACCESS_PUBLIC
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33 &ACCESS_PROTECTED
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34 &ACCESS_PRIVATE
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35 &PROP_GET
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36 &PROP_SET
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37 &PROP_OWNERSET
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38 &PROP_LIST
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39 &PROP_ALL
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40 &PROP_RO
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41 &PROP_RW
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42 &PROP_DIRECT
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43 )
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44 ],
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45 compare => [
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46 qw(
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47 &equals
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48 &equals_s
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49 &hashCompare
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50 )
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51 ],
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52 hash => [
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53 qw(
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54 &hashApply
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55 &hashMerge
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56 &hashDiff
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57 &hashCompare
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58 &hashParse
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59 &hashSave
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60 )
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61 ]
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62 );
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63
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64 our @EXPORT_OK = keys %{ { map (($_,1) , map (@{$_}, values %EXPORT_TAGS) ) } };
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65
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66 use IMPL::Const qw(:all);
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67
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68 sub is($$) {
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69 carp "A typename can't be undefined" unless $_[1];
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70 blessed($_[0]) and $_[0]->isa( $_[1] );
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71 }
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72
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73 sub isclass {
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74 carp "A typename can't be undefined" unless $_[1];
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75 local $@;
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76 eval {not ref $_[0] and $_[0]->isa( $_[1] ) };
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77 }
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78
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79 sub typeof(*) {
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80 local $@;
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81 eval { $_[0]->_typeof } || blessed($_[0]) || ref($_[0]);
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82 }
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83
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84 sub public($) {
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85 my $info = shift;
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86 $info->{access} = ACCESS_PUBLIC;
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87 my $implementor = delete $info->{implementor};
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88 $implementor->Implement($info);
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89 }
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90
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91 sub private($) {
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92 my $info = shift;
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93 $info->{access} = ACCESS_PRIVATE;
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94 my $implementor = delete $info->{implementor};
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95 $implementor->Implement($info);
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96 }
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97
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98 sub protected($) {
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99 my $info = shift;
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100 $info->{access} = ACCESS_PROTECTED;
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101 my $implementor = delete $info->{implementor};
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102 $implementor->Implement($info);
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103 }
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104
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105 sub _direct ($) {
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106 my $info = shift;
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107 $info->{direct} = 1;
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108 return $info;
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109 }
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110
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111 sub property($$) {
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112 my ($propName,$attributes) = @_;
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113
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114 $attributes = {
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115 get => $attributes & PROP_GET,
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116 set => $attributes & PROP_SET,
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117 isList => $attributes & PROP_LIST
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118 } unless ref $attributes;
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119
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120 my $class = caller;
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121
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122 return hashMerge (
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123 $attributes,
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124 {
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125 implementor => $class->ClassPropertyImplementor,
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126 name => $propName,
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127 class => scalar(caller),
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128 }
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129 );
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130 }
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131
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132 sub static($$) {
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133 my ( $name, $value ) = @_;
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134 my $class = caller;
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135 $class->static_accessor( $name, $value );
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136 }
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137
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408
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138 sub coarsen {
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139 my ( $value, $resolution ) = @_;
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140 return $resolution ? ceil( $value / $resolution ) * $resolution : $value;
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141 }
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142
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407
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143 sub equals {
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144 if (defined $_[0]) {
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145 return 0 if (not defined $_[1]);
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146
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147 return $_[0] == $_[1];
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148 } else {
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149 return 0 if defined $_[1];
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150
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151 return 1;
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152 }
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153 }
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154
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155 sub equals_s {
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156 if (defined $_[0]) {
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157 return 0 if (not defined $_[1]);
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158
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159 return $_[0] eq $_[1];
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160 } else {
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161 return 0 if defined $_[1];
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162
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163 return 1;
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164 }
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165 }
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166
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167 sub hashDiff {
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168 my ($src,$dst) = @_;
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169
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170 $dst = $dst ? { %$dst } : {} ;
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171 $src ||= {};
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172
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173 my %result;
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174
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175 foreach my $key ( keys %$src ) {
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176 if (exists $dst->{$key}) {
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177 $result{"+$key"} = $dst->{$key} unless equals_s($dst->{$key}, $src->{$key});
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178 delete $dst->{$key};
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179 } else {
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180 $result{"-$key"} = 1;
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181 }
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182 }
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183
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184 $result{"+$_"} = $dst->{$_} foreach keys %$dst;
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185
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186 return \%result;
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187 }
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188
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189 sub hashMerge {
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190 return hashApply( { %{$_[0] || {}} }, $_[1] );
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191 }
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192
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193 sub hashApply {
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194 my ($target,$diff) = @_;
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195
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196 return $target unless ref $diff eq 'HASH';
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197
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198 while ( my ($key,$value) = each %$diff) {
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199 $key =~ /^(\+|-)?(.*)$/;
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200 my $op = $1 || '+';
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201 $key = $2;
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202
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203 if ($op eq '-') {
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204 delete $target->{$key};
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205 } else {
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206 $target->{$key} = $value;
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207 }
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208 }
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209
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210 return $target;
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211 }
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212
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213 sub hashCompare {
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214 my ($l,$r,$cmp) = @_;
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215
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216 $cmp ||= \&equals_s;
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217
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218 return 0 unless scalar keys %$l == scalar keys %$r;
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219 &$cmp($l->{$_},$r->{$_}) || return 0 foreach keys %$l;
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220
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221 return 1;
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222 }
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223
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224 sub hashParse {
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225 my ($s,$p,$d) = @_;
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226
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227 $p = $p ? qr/$p/ : qr/\n+/;
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228 $d = $d ? qr/$d/ : qr/\s*=\s*/;
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229
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230 return {
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231 map split($d,$_,2), split($p,$s)
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232 };
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233 }
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234
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235 sub hashSave {
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236 my ($hash,$p,$d) = @_;
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237
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238 return "" unless ref $hash eq 'HASH';
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239
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240 $p ||= "\n";
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241 $d ||= " = ";
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242
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243 return
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244 join(
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245 $p,
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246 map(
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247 join(
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248 $d,
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249 $_,
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250 $hash->{$_}
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251 ),
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252 keys %$hash
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253 )
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254 );
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255 }
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256
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257 1;
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