| 1 |
# Switcher Module
|
| 2 |
#
|
| 3 |
# Look for elements given in input has in a string
|
| 4 |
# If found then call a routine name with the same name
|
| 5 |
# Implemented as an object to maintain state info between each line
|
| 6 |
# processed.
|
| 7 |
# Interface
|
| 8 |
# ---------
|
| 9 |
# new(file,objectref) : A new object - filename of file to parse
|
| 10 |
# objectref->of the methods
|
| 11 |
# usetags(tagobjref) : Specify a tagcontainer set to direct to
|
| 12 |
# to the desired routines
|
| 13 |
# usegroupchecker(groupchecker) : Set a groupchecker
|
| 14 |
# parse() : Parse the file
|
| 15 |
# checkparam($name,$par) : Exit with an error message if parameter
|
| 16 |
# is undefined in tag $name
|
| 17 |
# line() : return the current line number of the parse
|
| 18 |
|
| 19 |
package Switcher;
|
| 20 |
require 5.001;
|
| 21 |
use Carp;
|
| 22 |
|
| 23 |
sub new {
|
| 24 |
my $class=shift;
|
| 25 |
my $file=shift;
|
| 26 |
my $objectname=shift;
|
| 27 |
my $groupchecker=shift;
|
| 28 |
|
| 29 |
my $self = {};
|
| 30 |
$self->{allw}=$objectname;
|
| 31 |
bless $self, $class;
|
| 32 |
$self->_initialise($file);
|
| 33 |
return $self;
|
| 34 |
}
|
| 35 |
|
| 36 |
sub _initialise (hash1) {
|
| 37 |
my $self=shift;
|
| 38 |
$self->{filename}=shift;
|
| 39 |
|
| 40 |
# add a default groupchecker
|
| 41 |
use ActiveDoc::GroupChecker;
|
| 42 |
$self->{groupchecker}=GroupChecker->new();
|
| 43 |
$self->{groupchecker}->include("all");
|
| 44 |
|
| 45 |
# Add a default TagContainer
|
| 46 |
use ActiveDoc::TagContainer;
|
| 47 |
$self->{tagcontainer}=TagContainer->new();
|
| 48 |
|
| 49 |
}
|
| 50 |
|
| 51 |
sub usetags {
|
| 52 |
my $self=shift;
|
| 53 |
my $tagcontainer=shift;
|
| 54 |
|
| 55 |
$self->{tagcontainer}=$tagcontainer;
|
| 56 |
}
|
| 57 |
|
| 58 |
sub usegroupchecker {
|
| 59 |
my $self=shift;
|
| 60 |
my $ref=shift;
|
| 61 |
|
| 62 |
$self->{groupchecker}=$ref;
|
| 63 |
}
|
| 64 |
|
| 65 |
sub parse {
|
| 66 |
my $self=shift;
|
| 67 |
my $char;
|
| 68 |
$self->{linecount}=0;
|
| 69 |
$self->_resetvars();
|
| 70 |
|
| 71 |
# Open the file
|
| 72 |
use FileHandle;
|
| 73 |
my $filehandle=FileHandle->new();
|
| 74 |
open( $filehandle , "$self->{filename}" )
|
| 75 |
or return 1;
|
| 76 |
# or carp "Switcher: Cannot open $self->{filename} $! \n";
|
| 77 |
|
| 78 |
# Start file processing
|
| 79 |
while ( <$filehandle> ) {
|
| 80 |
$self->{linecount}++;
|
| 81 |
$self->{currentline}=$_;
|
| 82 |
$self->{stringpos}=0;
|
| 83 |
while ( ($char=$self->_nextchar()) ne "" ) {
|
| 84 |
$self->_checkchar($char);
|
| 85 |
} # end char while
|
| 86 |
} # End String while loop
|
| 87 |
close $filehandle;
|
| 88 |
}
|
| 89 |
|
| 90 |
sub checkparam($name, $key) {
|
| 91 |
my $self=shift;
|
| 92 |
my $name=shift;
|
| 93 |
my $key=shift;
|
| 94 |
|
| 95 |
if ( ! defined $self->{tagvar}{$key} ) {
|
| 96 |
print "Switcher: Badly formed $name tag -".
|
| 97 |
" undefined $key parameter\n";
|
| 98 |
exit 1;
|
| 99 |
}
|
| 100 |
}
|
| 101 |
|
| 102 |
#
|
| 103 |
# return the current line number
|
| 104 |
#
|
| 105 |
sub line {
|
| 106 |
my $self=shift;
|
| 107 |
return $self->{linecount};
|
| 108 |
}
|
| 109 |
# --------------- Utility routines ----------------------------
|
| 110 |
|
| 111 |
#
|
| 112 |
# Some initialisation of test suites
|
| 113 |
#
|
| 114 |
sub _resetvars {
|
| 115 |
my $self=shift;
|
| 116 |
$self->{quotes}=0;
|
| 117 |
$self->{lastlabel}="";
|
| 118 |
$self->{textcontext}='none';
|
| 119 |
$self->{tagcontext}="text";
|
| 120 |
$self->_resetstore();
|
| 121 |
}
|
| 122 |
|
| 123 |
#
|
| 124 |
# Check for control characters
|
| 125 |
#
|
| 126 |
sub _checkchar {
|
| 127 |
my $self=shift;
|
| 128 |
my $char=shift;
|
| 129 |
my $string;
|
| 130 |
|
| 131 |
# ---- In a tag
|
| 132 |
if ( $self->{tagcontext}=~/tag/ ) {
|
| 133 |
if ( ! $self->_quotetest($char) ) {
|
| 134 |
if ( ! $self->_labeltest($char) ) {
|
| 135 |
if ( $char eq ">") { $self->_closetag(); }
|
| 136 |
else { $self->_putstore($char); }
|
| 137 |
}
|
| 138 |
}
|
| 139 |
}
|
| 140 |
# ------ Outside a tag
|
| 141 |
else {
|
| 142 |
if ( $char eq "<") { $self->_opentag() }
|
| 143 |
else { $self->_putstore($char) }
|
| 144 |
}
|
| 145 |
}
|
| 146 |
|
| 147 |
|
| 148 |
#
|
| 149 |
# Return the next character from the current string buffer
|
| 150 |
#
|
| 151 |
sub _nextchar() {
|
| 152 |
my $self=shift;
|
| 153 |
my $char;
|
| 154 |
$char=substr($self->{currentline},$self->{stringpos}++,1);
|
| 155 |
# print "Debug : Fetching character $char\n";
|
| 156 |
return $char;
|
| 157 |
}
|
| 158 |
|
| 159 |
sub _opentag {
|
| 160 |
my $self=shift;
|
| 161 |
my $char;
|
| 162 |
|
| 163 |
# Close the last text segment
|
| 164 |
$self->_calltag($self->{textcontext}, $self->{textcontext},
|
| 165 |
$self->_getstore());
|
| 166 |
$self->_resetstore();
|
| 167 |
$self->_resetlabels();
|
| 168 |
|
| 169 |
# Do we have an opening or closing tag?
|
| 170 |
if ( ($char=$self->_nextchar()) eq "/" ) { #we have a closing tag
|
| 171 |
$self->{tagcontext}="endtag";
|
| 172 |
}
|
| 173 |
else { # an opening tag
|
| 174 |
$self->{tagcontext}="starttag";
|
| 175 |
$self->_checkchar($char);
|
| 176 |
}
|
| 177 |
#print "\nDebug : Opening $self->{tagcontext}\n";
|
| 178 |
}
|
| 179 |
|
| 180 |
#
|
| 181 |
# Close a tag
|
| 182 |
#
|
| 183 |
sub _closetag {
|
| 184 |
my $self=shift;
|
| 185 |
my $tagroutine;
|
| 186 |
|
| 187 |
# -- Finish off any labels/get tagname
|
| 188 |
$self->_closelabel();
|
| 189 |
|
| 190 |
# -- Call the associated tag function if appropriate
|
| 191 |
$tagroutine=$self->{tagname}."_".$self->{tagcontext};
|
| 192 |
$self->_calltag($tagroutine, $self->{tagname},
|
| 193 |
$self->{tagvar});
|
| 194 |
#print "\nDebug : Closing Tag $tagroutine\n";
|
| 195 |
|
| 196 |
# -- Now make sure the text context is set for calling routines to
|
| 197 |
# -- deal with text portions outside of tags
|
| 198 |
if ( $self->{tagcontext} eq "starttag" ) {
|
| 199 |
push @{$self->{textstack}} , $self->{textcontext};
|
| 200 |
$self->{textcontext}=$self->{tagname};
|
| 201 |
}
|
| 202 |
else {
|
| 203 |
if ( $#{$self->{textstack}} > -1 ) {
|
| 204 |
if ( $self->{textcontext} eq $self->{tagname} ) {
|
| 205 |
$self->{textcontext}=pop @{$self->{textstack}};
|
| 206 |
}
|
| 207 |
else { #The tag we are closing is not the last one so
|
| 208 |
# we keep our current context.
|
| 209 |
$self->_removefromstack($self->{tagname},$self->{textstack});
|
| 210 |
}
|
| 211 |
|
| 212 |
}
|
| 213 |
else { # more close tags than open ones
|
| 214 |
print "Warning : Unmatched </...> tag on line ".
|
| 215 |
$self->line()."\n";
|
| 216 |
}
|
| 217 |
}
|
| 218 |
# Reset context back to text
|
| 219 |
$self->{tagcontext}="text";
|
| 220 |
}
|
| 221 |
|
| 222 |
sub _calltag {
|
| 223 |
my $self=shift;
|
| 224 |
my $tagroutine=shift;
|
| 225 |
my @args=@_;
|
| 226 |
my $rt;
|
| 227 |
|
| 228 |
if ( $self->{groupchecker}->status() ||
|
| 229 |
( $self->{tagcontainer}->inquiregroup($tagroutine)) ) {
|
| 230 |
$rt=$self->{tagcontainer}->getroutine($tagroutine);
|
| 231 |
if ( $rt ne "" ) {
|
| 232 |
&{$rt}( $self->{allw},@_);
|
| 233 |
}
|
| 234 |
}
|
| 235 |
}
|
| 236 |
|
| 237 |
sub _removefromstack {
|
| 238 |
my $self=shift;
|
| 239 |
my $name=shift;
|
| 240 |
my $stack=shift;
|
| 241 |
my $this;
|
| 242 |
|
| 243 |
undef @tempstack;
|
| 244 |
#print "In ----".$#{$stack};
|
| 245 |
# Keep popping until we find our string
|
| 246 |
while ( ($this=(pop @{$stack})) ne "$name") {
|
| 247 |
push @tempstack, $this;
|
| 248 |
if ( $#{$stack} < 0 ) { last; }
|
| 249 |
}
|
| 250 |
# Now put them back
|
| 251 |
while ( $#tempstack>-1) {
|
| 252 |
$this=pop @tempstack;
|
| 253 |
push @{$stack}, $this;
|
| 254 |
}
|
| 255 |
#print " Out ----".$#{$stack};
|
| 256 |
}
|
| 257 |
|
| 258 |
#
|
| 259 |
# Quote handling
|
| 260 |
#
|
| 261 |
|
| 262 |
sub _quotetest {
|
| 263 |
my $self=shift;
|
| 264 |
my $char=shift;
|
| 265 |
|
| 266 |
# --- Are we already in a quote context?
|
| 267 |
if ( $self->{quotes} ) {
|
| 268 |
if ( $char eq $self->{openquote} ) {
|
| 269 |
$self->{quotes}=0;
|
| 270 |
}
|
| 271 |
else {
|
| 272 |
$self->_putstore($char);
|
| 273 |
}
|
| 274 |
}
|
| 275 |
# --- Unquoted Context
|
| 276 |
elsif ( (($char eq "\"") || ($char eq "\'") || ($char eq "\`")) ) {
|
| 277 |
$self->{quotes}=1;
|
| 278 |
$self->{openquote}=$char;
|
| 279 |
}
|
| 280 |
else { return 0; } # Return zero if not quoted
|
| 281 |
return 1; # 1 otherwise
|
| 282 |
}
|
| 283 |
|
| 284 |
#
|
| 285 |
# Label handling
|
| 286 |
#
|
| 287 |
sub _labeltest {
|
| 288 |
my $self=shift;
|
| 289 |
my $char=shift;
|
| 290 |
|
| 291 |
# Spaces are markers between tags
|
| 292 |
if ( ($char eq " ") || ($char eq "\n") || ($char eq "\t")) {
|
| 293 |
$self->_closelabel();
|
| 294 |
}
|
| 295 |
# Check for a change in label status
|
| 296 |
elsif ( $char eq "=" ) {
|
| 297 |
$self->{lastlabel}=$self->_getstore();
|
| 298 |
$self->_resetstore();
|
| 299 |
}
|
| 300 |
else {
|
| 301 |
return 0;
|
| 302 |
}
|
| 303 |
return 1;
|
| 304 |
}
|
| 305 |
|
| 306 |
sub _resetlabels {
|
| 307 |
my $self=shift;
|
| 308 |
undef $self->{tagvar};
|
| 309 |
}
|
| 310 |
|
| 311 |
sub _closelabel {
|
| 312 |
my $self=shift;
|
| 313 |
|
| 314 |
# Do we have a label name?
|
| 315 |
if ( $self->{lastlabel} ne "" ) {
|
| 316 |
$self->{tagvar}{$self->{lastlabel}}=$self->_getstore();
|
| 317 |
$self->{lastlabel}="";
|
| 318 |
}
|
| 319 |
elsif ( $self->_getstore() ne "") {
|
| 320 |
#Then it must be the tag name
|
| 321 |
($self->{tagname}=$self->_getstore())=~tr/A-Z/a-z/;
|
| 322 |
}
|
| 323 |
$self->_resetstore();
|
| 324 |
}
|
| 325 |
|
| 326 |
#
|
| 327 |
# Character Store management interface
|
| 328 |
#
|
| 329 |
sub _putstore() {
|
| 330 |
my $self=shift;
|
| 331 |
my $char=shift;
|
| 332 |
|
| 333 |
$self->{stringbuff}=$self->{stringbuff}.$char;
|
| 334 |
}
|
| 335 |
|
| 336 |
sub _getstore() {
|
| 337 |
my $self=shift;
|
| 338 |
|
| 339 |
return $self->{stringbuff};
|
| 340 |
}
|
| 341 |
|
| 342 |
sub _resetstore {
|
| 343 |
my $self=shift;
|
| 344 |
$self->{stringbuff}="";
|
| 345 |
}
|
