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407
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1 package IMPL::Web::Handler::View;
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2 use strict;
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3
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4 use Carp qw(carp);
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5 use List::Util qw(first);
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6 use IMPL::lang;
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7 use IMPL::Const qw(:prop);
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8 use IMPL::declare {
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9 require => {
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10 Factory => 'IMPL::Web::View::ObjectFactory',
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11 HttpResponse => 'IMPL::Web::HttpResponse',
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12 Loader => 'IMPL::Code::Loader',
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13 ViewResult => 'IMPL::Web::ViewResult',
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14 Security => 'IMPL::Security'
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15 },
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16 base => [
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17 'IMPL::Object' => undef,
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18 'IMPL::Object::Autofill' => '@_',
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19 'IMPL::Object::Serializable' => undef
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20 ],
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21
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22 props => [
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23 contentType => PROP_RO,
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24 contentCharset => PROP_RO,
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25 view => PROP_RO,
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26 layout => PROP_RO,
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27 selectors => PROP_RO,
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28 defaultDocument => PROP_RW,
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29 _selectorsCache => PROP_RW
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30 ]
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31 };
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32
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33 sub CTOR {
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34 my ($this) = @_;
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35
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36 $this->_selectorsCache([ map $this->ParseRule($_), @{$this->selectors || []} ]);
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37 }
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38
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39 sub Invoke {
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40 my ( $this, $action, $next ) = @_;
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41
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42 my $result = $next ? $next->($action) : undef;
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43
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44 my $model;
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45 if( ref $result and eval { $result->isa(ViewResult) } ) {
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46 $model = $result->model;
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47 } else {
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48 $model = $result;
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49 $result = ViewResult->new(model => $model);
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50 }
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51
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52 my $vars = {
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53 result => $result,
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54 request => sub { $action },
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55 app => $action->application,
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56 location => $action->context->{resourceLocation},
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57 resource => $action->context->{resource},
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58 layout => $this->layout,
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59 document => {},
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60 session => sub { Security->context },
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61 user => sub { Security->principal },
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62 security => sub { $action->security }
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63 };
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64
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65 my %responseParams = (
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66 type => $this->contentType,
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67 charset => $this->contentCharset,
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68 body => $this->view->display(
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69 $model,
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70 $this->SelectView( $action, ref $model ),
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71 $vars
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72 )
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73 );
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74
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75 $responseParams{status} = $result->status if $result->status;
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76 $responseParams{cookies} = $result->cookies if ref $result->cookies eq 'HASH';
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77 $responseParams{headers} = $result->headers if ref $result->headers eq 'HASH';
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78
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79 return HttpResponse->new(
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80 %responseParams
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81 );
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82 }
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83
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84 sub SelectView {
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85 my ($this,$action) = @_;
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86
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87 my @path;
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88
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89 for(my $r = $action->context->{resource}; $r ; $r = $r->parent ) {
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90 unshift @path, {
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91 name => $r->id,
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92 class => typeof($r->model)
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93 };
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94 }
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95
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96 @path = map { name => $_}, split /\/+/, $action->query->path_info()
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97 unless (@path);
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98
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99 return $this->MatchPath(\@path,$this->_selectorsCache) || $this->defaultDocument;
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100 }
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101
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102 sub ParseRule {
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103 my ($this, $rule) = @_;
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104
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105 my ($selector,$data) = split /\s+=>\s+/, $rule;
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106
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107 my @parts;
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108 my $first = 1;
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109 my $weight = 0;
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110 foreach my $part ( split /\//, $selector ) {
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111 # если первым символом является /
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112 # значит путь в селекторе абсолютный и не нужно
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113 # добавлять "любой" элемент в начало
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114
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115 if($part) {
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116 $weight ++;
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117 push @parts,{ any => 1 } if $first;
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118 } else {
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119 push @parts,{ any => 1 } unless $first;
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120 next;
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121 }
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122
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123 my ($name,$class) = split /@/, $part;
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124
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125 if ( my ( $varName, $rx ) = ( $name =~ m/^\{(?:(\w+)\:)?(.*)\}$/ ) ) {
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126 #this is a regexp
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127
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128 push @parts, {
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129 rx => $rx,
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130 var => $varName,
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131 class => $class,
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132 };
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133 } else {
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134 push @parts, {
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135 name => length($name) ? $name : undef,
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136 class => $class,
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137 };
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138 }
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139 } continue {
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140 $first = 0;
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141 }
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142
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143 return { selector => \@parts, data => $data, weight => $weight };
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144 }
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145
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146 sub MatchPath {
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147 my ($this,$path,$rules) = @_;
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148
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149 $path ||= [];
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150 $rules ||= [];
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151
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152 my @next;
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153
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154 foreach my $segment (@$path) {
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155 foreach my $rule (@$rules) {
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156 my @selector = @{$rule->{selector}};
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157
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158 my $part = shift @selector;
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159
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160 # if this rule doesn't have a selector
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161 next unless $part;
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162
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163 if ($part->{any}) {
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164 #keep the rule for the next try
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165 push @next, $rule;
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166
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167 $part = shift @selector while $part->{any};
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168 }
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169
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170 my $newRule = {
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171 selector => \@selector,
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172 data => $rule->{data},
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173 weight => $rule->{weight},
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174 vars => { %{$rule->{vars} || {}} }
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175 };
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176
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177 my $success = 1;
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178 if (my $class = $part->{class}) {
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179 $success = isclass($segment->{class},$class);
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180 }
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181
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182 if($success && (my $name = $part->{name})) {
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183 $success = $segment->{name} eq $name;
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184 } elsif ($success && (my $rx = $part->{rx})) {
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185 if( my @captures = ($segment->{name} =~ m/($rx)/) ) {
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186 $newRule->{vars}->{$part->{var}} = \@captures
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187 if $part->{var};
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188 } else {
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189 $success = 0;
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190 }
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191 }
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192
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193 push @next, $newRule if $success;
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194
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195 }
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196 $rules = [@next];
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197 undef @next;
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198 }
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199
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200 my $result = (
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201 sort {
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202 $b->{weight} <=> $a->{weight}
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203 }
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204 grep {
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205 scalar(@{$_->{selector}}) == 0
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206 }
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207 @$rules
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208 )[0];
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209
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210 if($result) {
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211 my $data = $result->{data};
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212 $data =~ s/{(\w+)(?:\:(\d+))?}/
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213 my ($name,$index) = ($1,$2 || 0);
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214
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215 if ($result->{vars}{$name}) {
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216 $result->{vars}{$name}[$index];
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217 } else {
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218 "";
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219 }
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220 /gex;
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221
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222 return $data;
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223 } else {
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224 return;
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225 }
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226 }
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227
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228 1;
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229
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230 __END__
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231
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232 =pod
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233
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234 =head1 NAME
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235
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236 C<IMPL::Web::Handler::TTView> - использует шаблоны для построения представления.
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237
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238 =head1 SYNOPSIS
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239
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240 =begin code xml
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241
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242 <item id="html-view" type="IMPL::Web::Handler::View">
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243 <contentType>text/html</contentType>
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244 <view id="tt-loader" type="IMPL::Web::View::TTView">
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245 <options type="HASH">
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246 <INCLUDE_PATH type="IMPL::Config::Reference">
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247 <target>IMPL::Config</target>
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248 <AppBase>view</AppBase>
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249 </INCLUDE_PATH>
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250 <INTERPOLATE>1</INTERPOLATE>
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251 <POST_CHOMP>1</POST_CHOMP>
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252 <ENCODING>utf-8</ENCODING>
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253 </options>
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254 <ext>.tt</ext>
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255 <initializer>global.tt</initializer>
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256 <layoutBase>layouts</layoutBase>
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257 </view>
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258 <defaultDocument>default</defaultDocument>
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259 <selectors type="ARRAY">
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260 <item>@HASH => dump</item>
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261 <item>@My::Data::Product => product/info</item>
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262 <item>{action:.*} @My::Data::Product => product/{action}</item>
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263 </selectors>
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264 </item>
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265
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266 =end code xml
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267
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268 =head1 DESCRIPTION
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269
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270 Подбирает шаблон для представления результата, полученного при выполнении следующего обработчика. При
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271 выборе используется принцип похожий на селекторы C<CSS>, основывающийся на именах ресурсов и их типах
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272 данных.
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273
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274 Данный обработчик понимает определенные свойства контекста:
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275
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276 =over
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277
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278 =item * C<resourceLocation>
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279
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280 В данном свойстве может быть передана информация о текущем расположении ресурса,
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281 для которого строится представление. Эта информация будет доступна в шаблоне
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282 через свойство документа C<location>.
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283
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284 =item * C<environment>
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285
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286 В данном совойстве контекста передается дополнительная информация об окружении
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287 ресурса, например, которую задали родительские ресурсы. Использование данного
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288 свойства позволяет не загромождать ресурс реализацией функциональности по
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289 поддержке окружения. Это свойство может быть ссылкой на функцию, что позволяет
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290 формировать контекст только по необходимости, при этом указанная функция будет
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291 выполнена только один раз, при первом обращении.
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292
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293 =back
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294
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295 =head1 SELECTORS
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296
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297 =begin text
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298
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299 syntax::= selector => template
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300
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301 selector::= ([>]segment-template[@class-name])
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302
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303 segment-template::= {'{'name:regular-expr'}'|segment-name}
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304
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305 name::= \w+
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306
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307 segment-name::= \S+
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308
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309 class-name::= name[(::name)]
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310
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311 url-template@class => template
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312
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313 shoes => product/list
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314 /shop//{action:*.}@My::Data::Product => product/{action}
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315
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316 stuff >list => product/list
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317 details => product/details
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318
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319 =end text
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320
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321
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322 =cut
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323
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