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