annotate Lib/IMPL/Text/Parser/Player.pm @ 96:4c55aed00ff2

Minor changes
author wizard
date Fri, 30 Apr 2010 15:03:38 +0400
parents 16ada169ca75
children 4267a2ac3d46
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 package IMPL::Text::Parser::Player;
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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 base qw(IMPL::Object);
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6 use IMPL::Class::Property;
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7 use IMPL::Class::Property::Direct;
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8
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9 use IMPL::Text::Parser::Chunk;
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10
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11 my %opCodesMap = (
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12 IMPL::Text::Parser::Chunk::OP_REGEXP , &MatchRegexp ,
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13 IMPL::Text::Parser::Chunk::OP_STRING , &MatchString ,
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14 IMPL::Text::Parser::Chunk::OP_REFERENCE , &MatchReference ,
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15 IMPL::Text::Parser::Chunk::OP_CHUNK , &PlayChunk ,
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16 IMPL::Text::Parser::Chunk::OP_SWITCH , &MatchSwitch ,
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17 IMPL::Text::Parser::Chunk::OP_REPEAT , &MatchRepeat
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18 );
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19
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20 BEGIN {
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21 private _direct property _data => prop_all;
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22 private _direct property _current => prop_all;
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23 private _direct property _states => prop_all;
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24 private _direct property _document => prop_all;
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25
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26 public _direct property errorLast => prop_all;
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27 public _direct property Punctuation => prop_all;
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28 public _direct property Delimier => prop_all;
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29 }
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30
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31 sub CTOR {
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32 my ($this,$document) = @_;
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33
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34 $this->{$_document} = $document or die new IMPL::InvalidArgumentException("The first parameter must be a document");
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35 }
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36
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37 sub LoadString {
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38 my ($this,$string) = @_;
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39
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40 my $rxDelim = /(\s+|[.,;!-+*~$^&|%()`@\\\/])/;
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41
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42 my $line = 0;
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43
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44 $this->{$_data} = [
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45 map {
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46 $line++;
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47 map {
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48 [$line,$_]
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49 } split $rxDelim, $_
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50 } split /\n/, $string
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51 ]
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52 }
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53
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54 sub Play {
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55 my ($this) = @_;
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56 }
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57
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58 sub PlayChunk {
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59 my ($this,$chunk) = @_;
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60
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61 my $end = 0;
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62
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63 my $name = $chunk->chunkName;
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64
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65 $this->enter($name) if $name;
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66
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67 foreach my $op ( @{$chunk->opStream} ) {
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68 $this->leave(0) and return $this->error("no more data") if $end;
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69
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70 $opCodesMap{shift @$op}->(@$op) || return $this->leave(0) ;
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71 $this->moveNext or $end = 1;
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72 }
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73
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74 return $this->leave(1);
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75 }
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76
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77 sub MatchRegexp {
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78 my ($this,$rx) = @_;
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79
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80 $this->{$_current}{token} =~ $rx ? ($this->data() and return 1) : return $this->error("Expected: $rx");
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81 }
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82
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83 sub MatchString {
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84 my ($this,$string) = @_;
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85
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86 $this->{$_current}{token} eq $string ? ($this->data() and return 1) : return $this->error("Expected: $string");
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87 }
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88
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89 sub MatchReference {
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90 my ($this,$name) = @_;
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91
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92 my $chunk = $this->ResolveChunk($name) || return $this->error("Invalid reference: $name");
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93 return $this->PlayChunk($chunk);
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94 }
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95
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96 sub MatchSwitch {
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97 my ($this,@chunks) = @_;
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98
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99 foreach my $chunk (@chunks) {
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100 $this->save;
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101 if ( $this->PlayChunk($chunk) ) {
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102 $this->apply;
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103 return 1;
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104 } else {
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105 $this->restore;
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106 }
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107 }
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108
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109 return 0; # passthrough last error
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110 }
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111
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112 sub MatchRepeat {
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113 my ($this,$chunk, $min, $max) = @_;
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114
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115 my $count = 0;
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116
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117 $this->save;
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118 while (1) {
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119 $this->save;
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120 if ($this->PlayChunk($chunk)) {
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121 $count ++;
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122 $this->apply;
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123 $this->apply and return 1 if ($count >= $max)
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124 } else {
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125 $this->restore;
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126 $count >= $min ?
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127 ($this->apply() and return 1) :
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128 ($this->restore() and return $this->error("Expected at least $min occurances, got only $count"));
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129 }
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130 }
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131
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132 # we should never get here
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133 die new IMPL::InvalidOperationException("unexpected error");
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134 }
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135
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136 sub moveNext {
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137 my ($this) = @_;
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138
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139 my $pos = $this->{$_current}{pos};
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140
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141 $pos ++;
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142
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143 if ($pos < @{$this->{$_data}}) {
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144
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145 $this->{$_current} = {
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146 pos => $pos,
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147 token => $this->{$_data}[$pos][1],
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148 line => $this->{$_data}
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149 };
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150
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151 } else {
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152 $this->{$_current} = {};
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153 return undef;
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154 }
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155 }
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156
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157 sub ResolveChunk {
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158 my ($this,$name) = @_;
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159 }
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160
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161 sub save {
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162 my ($this) = @_;
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163
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164 push @{$this->{$_states}}, $this->{$_current};
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165 }
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166
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167 sub restore {
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168 my ($this) = @_;
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169
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170 $this->{$_current} = pop @{$this->{$_states}};
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171 }
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172
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173 sub apply {
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174 my ($this) = @_;
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175
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176 pop @{$this->{$_states}};
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177 }
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178
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179 sub error {
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180 my ($this,$message) = @_;
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181
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182 $this->{$errorLast} = {
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183 message => $message,
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184 line => $this->{$_current}{line},
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185 token => $this->{$_current}{token}
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186 };
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187
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188 return 0;
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189 }
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190
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191 sub __debug {
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192
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193 }
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194 sub enter {
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195 my ($this,$name) = @_;
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196
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197 #always return true;
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198 return 1;
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199 }
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200
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201 sub leave {
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202 my ($this,$isEmpty) = @_;
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203
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204 #always return true;
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205 return 1;
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206 }
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207
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208 sub data {
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209 my ($this) = @_;
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210
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211 my $data = $this->{$_current}{token};
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212
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213 # always return true;
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214 return 1;
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215 }
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216
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217 1;