#--- TocInsertor.pm -----------------------------------------------------------
# function: Insert Table of Contents HTML::Toc, generated by 
#           HTML::TocGenerator.
# note:     - The term 'propagate' is used as a shortcut for the process of 
#             both generating and inserting a ToC at the same time.
#           - 'TIP' is an abbreviation of 'Toc Insertion Point'.


package HTML::TocInsertor;


use strict;
use FileHandle;
use HTML::TocGenerator;


BEGIN {
	use vars qw(@ISA $VERSION);

	$VERSION = '0.91';

	@ISA = qw(HTML::TocGenerator);
}

	# TocInsertionPoint (TIP) constants
	
use constant TIP_PREPOSITION_REPLACE => 'replace';
use constant TIP_PREPOSITION_BEFORE  => 'before';
use constant TIP_PREPOSITION_AFTER   => 'after';

use constant TIP_TOKEN_ID           => 0;
use constant TIP_PREPOSITION        => 1;
use constant TIP_INCLUDE_ATTRIBUTES => 2;
use constant TIP_EXCLUDE_ATTRIBUTES => 3;
use constant TIP_TOC                => 4;

use constant MODE_DO_NOTHING   => 0;	# 0b00
use constant MODE_DO_INSERT    => 1;	# 0b01
use constant MODE_DO_PROPAGATE => 3;	# 0b11

END {}


#--- HTML::TocInsertor::new() -------------------------------------------------
# function: Constructor.

sub new {
		# Get arguments
	my ($aType) = @_;
	my $self = $aType->SUPER::new;
		# TRUE if insertion point token must be output, FALSE if not
	$self->{_doOutputInsertionPointToken} = 1;
		# Reset batch variables
	$self->_resetBatchVariables;
		# Bias to not insert ToC
	$self->{hti__Mode} = MODE_DO_NOTHING;

		# TODO: Initialize output

	return $self;
}  # new()


#--- HTML::TocInsertor::_deinitializeOutput() ---------------------------------
# function: Deinitialize output.

sub _deinitializeOutput {
		# Get arguments
	my ($self) = @_;
		# Filehandle is defined?
	if (defined($self->{_outputFileHandle})) {
		# Yes, filehandle is defined;
			# Restore selected filehandle
		select($self->{_oldFileHandle});
			# Undefine filehandle, closing it automatically
		undef $self->{_outputFileHandle};
	}
}  # _deinitializeOutput()


#--- HTML::TocInsertor::_initializeOutput() -----------------------------------
# function: Initialize output.

sub _initializeOutput {
		# Get arguments
	my ($self) = @_;
		# Bias to write to outputfile
	my $doOutputToFile = 1;

		# Is output specified?
	if (defined($self->{options}{'output'})) {
		# Yes, output is specified;
			# Indicate to not output to outputfile
		$doOutputToFile = 0;
			# Alias output reference
		$self->{_output} = $self->{options}{'output'};
			# Clear output
		${$self->{_output}} = "";
	}

		# Is output file specified?
	if (defined($self->{options}{'outputFile'})) {
		# Yes, output file is specified;
			# Indicate to output to outputfile
		$doOutputToFile = 1;
			# Open file
		$self->{_outputFileHandle} = 
			new FileHandle ">" . $self->{options}{'outputFile'};

			# Backup currently selected filehandle
		$self->{_oldFileHandle} = select;
			# Set new default filehandle
		select($self->{_outputFileHandle});
	}

		# Alias output-to-file indicator
	$self->{_doOutputToFile} = $doOutputToFile;
}  # _initializeOutput()


#--- HTML::TocInsertor::_deinitializeInsertorBatch() --------------------------
# function: Deinitialize insertor batch.

sub _deinitializeInsertorBatch {
		# Get arguments
	my ($self) = @_;
		# Indicate ToC insertion has finished
	$self->{_isTocInsertionPointPassed} = 0;
		# Write buffered output
	$self->_writeBufferedOutput();
		# Propagate?
	if ($self->{hti__Mode} == MODE_DO_PROPAGATE) {
		# Yes, propagate;
			# Deinitialize generator batch
		$self->_deinitializeGeneratorBatch();
	}
	else {
		# No, insert only;
			# Do general batch deinitialization
		$self->_deinitializeBatch();
	}
		# Deinitialize output
	$self->_deinitializeOutput();
		# Indicate end of batch
	$self->{hti__Mode} = MODE_DO_NOTHING;
		# Reset batch variables
	$self->_resetBatchVariables();
}  # _deinitializeInsertorBatch()


#--- HTML::TocInsertor::_initializeInsertorBatch() ----------------------------
# function: Initialize insertor batch.
# args:     - $aTocs: Reference to array of tocs.
#           - $aOptions: optional options

sub _initializeInsertorBatch {
		# Get arguments
	my ($self, $aTocs, $aOptions) = @_;
		# Add invocation options
	$self->setOptions($aOptions);
		# Option 'doGenerateToc' specified?
	if (!defined($self->{options}{'doGenerateToc'})) {
		# No, options 'doGenerateToc' not specified;
			# Default to 'doGenerateToc'
		$self->{options}{'doGenerateToc'} = 1;
	}
		# Propagate?
	if ($self->{options}{'doGenerateToc'}) {
		# Yes, propagate;
			# Indicate mode
		$self->{hti__Mode} = MODE_DO_PROPAGATE;
			# Initialize generator batch
			# NOTE: This method takes care of calling '_initializeBatch()'
		$self->_initializeGeneratorBatch($aTocs);
	}
	else {
		# No, insert;
			# Indicate mode
		$self->{hti__Mode} = MODE_DO_INSERT;
			# Do general batch initialization
		$self->_initializeBatch($aTocs);
	}
		# Initialize output
	$self->_initializeOutput();
		# Parse ToC insertion points
	$self->_parseTocInsertionPoints();
}  # _initializeInsertorBatch()


#--- HTML::TocInsertor::_insert() ---------------------------------------------
# function: Insert ToC in string.
# args:     - $aString: Reference to string to parse.
# note:     Used internally.

sub _insert {
		# Get arguments
	my ($self, $aString) = @_;
		# Propagate?
	if ($self->{options}{'doGenerateToc'}) {
		# Yes, propagate;
			# Generate & insert ToC
		$self->_generate($aString);
	}
	else {
		# No, just insert ToC
			# Insert by parsing file
		$self->parse($aString);
			# Flush remaining buffered text
		$self->eof();
	}
}  # _insert()


#--- HTML::TocInsertor::_insertIntoFile() -------------------------------------
# function: Do insert generated ToCs in file.
# args:     - $aToc: (reference to array of) ToC object(s) to insert.
#           - $aFile: (reference to array of) file(s) to parse for insertion
#                points.
#           - $aOptions: optional insertor options
# note:     Used internally.

sub _insertIntoFile {
		# Get arguments
	my ($self, $aFile) = @_;
		# Local variables;
	my ($file, @files);
		# Dereference array reference or make array of file specification
	@files = (ref($aFile) =~ m/ARRAY/) ? @$aFile : ($aFile);
		# Loop through files
	foreach $file (@files) {
			# Propagate?
		if ($self->{options}{'doGenerateToc'}) {
			# Yes, propagate;
				# Generate and insert ToC
			$self->_generateFromFile($file);
		}
		else {
			# No, just insert ToC
				# Insert by parsing file
			$self->parse_file($file);
		}
	}
}  # _insertIntoFile()


#--- HTML::TocInsertor::_parseTocInsertionPoints() ----------------------------
# function: Parse ToC insertion point specifier.

sub _parseTocInsertionPoints {
		# Get arguments
	my ($self) = @_;
		# Local variables
	my ($tipPreposition, $tipToken, $toc, $tokenTipParser);
		# Create parser for TIP tokens
	$tokenTipParser = HTML::_TokenTipParser->new(
		$self->{_tokensTip}
	);
		# Loop through ToCs
	foreach $toc (@{$self->{_tocs}}) {
			# Split TIP in preposition and token
		($tipPreposition, $tipToken) = split(
			'\s+', $toc->{options}{'insertionPoint'}, 2
		);
			# Known preposition?
		if (
			($tipPreposition ne TIP_PREPOSITION_REPLACE) &&
			($tipPreposition ne TIP_PREPOSITION_BEFORE) &&
			($tipPreposition ne TIP_PREPOSITION_AFTER)
		) {
			# No, unknown preposition;
				# Use default preposition
			$tipPreposition = TIP_PREPOSITION_AFTER;
				# Use entire 'insertionPoint' as token
			$tipToken = $toc->{options}{'insertionPoint'};
		}
			# Indicate current ToC to parser
		$tokenTipParser->setToc($toc);
			# Indicate current preposition to parser
		$tokenTipParser->setPreposition($tipPreposition);
			# Parse ToC Insertion Point
		$tokenTipParser->parse($tipToken);
			# Flush remaining buffered text
		$tokenTipParser->eof();
	}
}  # _parseTocInsertionPoints()


#--- HTML::TocInsertor::_processTokenAsInsertionPoint() -----------------------
# function: Check for token being a ToC insertion point (Tip) token and
#           process it accordingly.
# args:     - $aTokenType: type of token: start, end, comment or text.
#           - $aTokenId: token id of currently parsed token
#           - $aTokenAttributes: attributes of currently parsed token
#           - $aOrigText: complete token
# returns:  1 if successful -- token is processed as insertion point, 0
#           if not.

sub _processTokenAsInsertionPoint {
		# Get arguments
	my ($self, $aTokenType, $aTokenId, $aTokenAttributes, $aOrigText) = @_;
		# Local variables
	my ($i, $result, $tipToken, $tipTokenId, $tipTokens);
		# Bias to token not functioning as a ToC insertion point (Tip) token
	$result = 0;
		# Alias ToC insertion point (Tip) array of right type
	$tipTokens = $self->{_tokensTip}[$aTokenType];
		# Loop through tipTokens
	$i = 0;
	while ($i < scalar @{$tipTokens}) {
			# Aliases
		$tipToken			         = $tipTokens->[$i];
		$tipTokenId			         = $tipToken->[TIP_TOKEN_ID];
			# Id & attributes match?
		if (
			($aTokenId =~ m/$tipTokenId/) && (
				HTML::TocGenerator::_doesHashContainHash(
					$aTokenAttributes, $tipToken->[TIP_INCLUDE_ATTRIBUTES], 0
				) &&
				HTML::TocGenerator::_doesHashContainHash(
					$aTokenAttributes, $tipToken->[TIP_EXCLUDE_ATTRIBUTES], 1
				)
			)
		) {
			# Yes, id and attributes match;
				# Process ToC insertion point
			$self->_processTocInsertionPoint($tipToken);
				# Indicate token functions as ToC insertion point
			$result = 1;
				# Remove Tip token, automatically advancing to next token
			splice(@$tipTokens, $i, 1);
		}
		else {
			# No, tag doesn't match ToC insertion point
				# Advance to next start token
			$i++;
		}
	}
		# Token functions as ToC insertion point?
	if ($result) {
		# Yes, token functions as ToC insertion point;
			# Process insertion point(s)
		$self->_processTocInsertionPoints($aOrigText);
	}
		# Return value
	return $result;
}  # _processTokenAsInsertionPoint()


#--- HTML::TocInsertor::toc() -------------------------------------------------
# function: Toc processing method.  Add toc reference to scenario.
# args:     - $aScenario: Scenario to add ToC reference to.
#           - $aToc: Reference to ToC to insert.
# note:     The ToC hasn't been build yet; only a reference to the ToC to be
#           build is inserted.

sub toc {
		# Get arguments
	my ($self, $aScenario, $aToc) = @_;
		# Add toc to scenario
	push(@$aScenario, $aToc);
}  # toc()


#--- HTML::TocInsertor::_processTocInsertionPoint() ----------------------------
# function: Process ToC insertion point.
# args:     - $aTipToken: Reference to token array item which matches the ToC 
#                insertion point.

sub _processTocInsertionPoint {
		# Get arguments
	my ($self, $aTipToken) = @_;
		# Local variables
	my ($tipToc, $tipPreposition); 
	
		# Aliases
	$tipToc         = $aTipToken->[TIP_TOC];
	$tipPreposition = $aTipToken->[TIP_PREPOSITION];

	SWITCH: {
			# Replace token with ToC?
		if ($tipPreposition eq TIP_PREPOSITION_REPLACE) {
			# Yes, replace token;
				# Indicate ToC insertion point has been passed
			$self->{_isTocInsertionPointPassed} = 1;
				# Add ToC reference to scenario reference by calling 'toc' method
			$self->toc($self->{_scenarioAfterToken}, $tipToc);
			#push(@{$self->{_scenarioAfterToken}}, $tipTokenToc);
				# Indicate token itself must not be output
			$self->{_doOutputInsertionPointToken} = 0;
			last SWITCH;
		}
			# Output ToC before token?
		if ($tipPreposition eq TIP_PREPOSITION_BEFORE) {
			# Yes, output ToC before token;
				# Indicate ToC insertion point has been passed
			$self->{_isTocInsertionPointPassed} = 1;
				# Add ToC reference to scenario reference by calling 'toc' method
			$self->toc($self->{_scenarioBeforeToken}, $tipToc);
			#push(@{$self->{_scenarioBeforeToken}}, $tipTokenToc);
			last SWITCH;
		}
			# Output ToC after token?
		if ($tipPreposition eq TIP_PREPOSITION_AFTER) {
			# Yes, output ToC after token;
				# Indicate ToC insertion point has been passed
			$self->{_isTocInsertionPointPassed} = 1;
				# Add ToC reference to scenario reference by calling 'toc' method
			$self->toc($self->{_scenarioAfterToken}, $tipToc);
			#push(@{$self->{_scenarioAfterToken}}, $tipTokenToc);
			last SWITCH;
		}
	}
}  # _processTocInsertionPoint()


#--- HTML::TocInsertor::_processTocInsertionPoints() --------------------------
# function: Process ToC insertion points
# args:     - $aTokenText: Text of token which acts as insertion point for one
#                or multiple ToCs.

sub _processTocInsertionPoints {
		# Get arguments
	my ($self, $aTokenText) = @_;
		# Local variables
	my ($outputPrefix, $outputSuffix);
		# Extend scenario
	push(@{$self->{_scenario}}, @{$self->{_scenarioBeforeToken}});

	if ($outputPrefix = $self->{_outputPrefix}) {
		push(@{$self->{_scenario}}, \$outputPrefix);
		$self->{_outputPrefix} = "";
	}

		# Must insertion point token be output?
	if ($self->{_doOutputInsertionPointToken}) {
		# Yes, output insertion point token;
		push(@{$self->{_scenario}}, \$aTokenText);
	}

	if ($outputSuffix = $self->{_outputSuffix}) {
		push(@{$self->{_scenario}}, \$outputSuffix);
		$self->{_outputSuffix} = "";
	}

	push(@{$self->{_scenario}}, @{$self->{_scenarioAfterToken}});
		# Add new act to scenario for output to come
	my $output = "";
	push(@{$self->{_scenario}}, \$output);
		# Write output, processing possible '_outputSuffix'
	#$self->_writeOrBufferOutput("");
		# Reset helper scenario's
	$self->{_scenarioBeforeToken} = [];
	$self->{_scenarioAfterToken}  = [];
		# Reset bias value to output insertion point token
	$self->{_doOutputInsertionPointToken} = 1;

}  # _processTocInsertionPoints()


#--- HTML::Toc::_resetBatchVariables() ----------------------------------------
# function: Reset batch variables.

sub _resetBatchVariables {
	my ($self) = @_;
		# Call ancestor
	$self->SUPER::_resetBatchVariables();
		# Array containing references to scalars.  This array depicts the order
		# in which output must be performed after the first ToC Insertion Point
		# has been passed.
	$self->{_scenario}            = [];
		# Helper scenario
	$self->{_scenarioBeforeToken} = [];
		# Helper scenario
	$self->{_scenarioAfterToken}  = [];
		# Arrays containing start, end, comment, text & declaration tokens which 
		# must trigger the ToC insertion.  Each array element may contain a 
		# reference to an array containing the following elements:
	$self->{_tokensTip} = [
		[],	# TT_TOKENTYPE_START
		[],	# TT_TOKENTYPE_END
		[],	# TT_TOKENTYPE_COMMENT
		[],	# TT_TOKENTYPE_TEXT
		[]		# TT_TOKENTYPE_DECLARATION
	];
		# 1 if ToC insertion point has been passed, 0 if not
	$self->{_isTocInsertionPointPassed} = 0;
		# Tokens after ToC
	$self->{outputBuffer} = "";
		# Trailing text after parsed token
	$self->{_outputSuffix} = "";
		# Preceding text before parsed token
	$self->{_outputPrefix} = "";
}  # _resetBatchVariables()


#--- HTML::TocInsertor::_writeBufferedOutput() --------------------------------
# function: Write buffered output to output device(s).

sub _writeBufferedOutput {
		# Get arguments
	my ($self) = @_;
		# Local variables
	my ($scene);
		# Must ToC be parsed?
	if ($self->{options}{'parseToc'}) {
		# Yes, ToC must be parsed;
			# Parse ToC
		#$self->parse($self->{toc});
			# Output tokens after ToC
		#$self->_writeOrBufferOutput($self->{outputBuffer});
	}
	else {
		# No, ToC needn't be parsed;
			# Output scenario
		foreach $scene (@{$self->{_scenario}}) {
				# Is scene a reference to a scalar?
			if (ref($scene) eq "SCALAR") {
				# Yes, scene is a reference to a scalar;
					# Output scene
				$self->_writeOutput($$scene);
			}
			else {
				# No, scene must be reference to HTML::Toc;
					# Output toc
				$self->_writeOutput($scene->format());
			}
		}
	}
}  # _writeBufferedOutput()


#--- HTML::TocInsertor::_writeOrBufferOutput() --------------------------------
# function: Write processed HTML to output device(s).
# args:     - aOutput: scalar to write
# note:     If '_isTocInsertionPointPassed' text is buffered before being 
#           output because the ToC has to be generated before it can be output.
#           Only after the entire data has been parsed, the ToC and the 
#           following text will be output.

sub _writeOrBufferOutput {
		# Get arguments
	my ($self, $aOutput) = @_;

		# Add possible output prefix and suffix
	$aOutput = $self->{_outputPrefix} . $aOutput . $self->{_outputSuffix};
		# Clear output prefix and suffix
	$self->{_outputPrefix} = "";
	$self->{_outputSuffix} = "";

		# Has ToC insertion point been passed?
	if ($self->{_isTocInsertionPointPassed}) {
		# Yes, ToC insertion point has been passed;
			# Buffer output; add output to last '_scenario' item
		my $index = scalar(@{$self->{_scenario}}) - 1;
		${$self->{_scenario}[$index]} .= $aOutput;
	}
	else {
		# No, ToC insertion point hasn't been passed;
			# Write output
		$self->_writeOutput($aOutput);
	}
}  # _writeOrBufferOutput()


#--- HTML::TocInsertor::_writeOutput() ----------------------------------------
# function: Write processed HTML to output device(s).
# args:     - aOutput: scalar to write

sub _writeOutput {
		# Get arguments
	my ($self, $aOutput) = @_;
		# Write output to scalar;
	${$self->{_output}} .= $aOutput if (defined($self->{_output}));
		# Write output to output file
	print $aOutput if ($self->{_doOutputToFile})
}  # _writeOutput()


#--- HTML::TocGenerator::anchorId() -------------------------------------------
# function: Anchor id processing method.
# args:     - $aAnchorId

sub anchorId {
		# Get arguments
	my ($self, $aAnchorId) = @_;
		# Indicate id must be added to start tag
	$self->{_doAddAnchorIdToStartTag} = 1;
	$self->{_anchorId} = $aAnchorId;
}  # anchorId()


#--- HTML::TocInsertor::anchorNameBegin() -------------------------------------
# function: Process anchor name begin, generated by HTML::TocGenerator.
# args:     - $aAnchorNameBegin: Anchor name begin tag to output.
#           - $aToc: Reference to ToC to which anchorname belongs.

sub anchorNameBegin {
		# Get arguments
	my ($self, $aAnchorNameBegin, $aToc) = @_;
		# Is another anchorName active?
	if (defined($self->{_activeAnchorName})) {
		# Yes, another anchorName is active;
			# Show warning
		print "Warn\n";
		$self->_showWarning(
			HTML::TocGenerator::WARNING_NESTED_ANCHOR_PS_WITHIN_PS,
			[$aAnchorNameBegin, $self->{_activeAnchorName}]
		);
	}
		# Store anchor name as output prefix
	$self->{_outputPrefix} = $aAnchorNameBegin;
		# Indicate active anchor name
	$self->{_activeAnchorName} = $aAnchorNameBegin;
		# Indicate anchor name end must be output
	$self->{_doOutputAnchorNameEnd} = 1;
}	# anchorNameBegin()


#--- HTML::TocInsertor::anchorNameEnd() ---------------------------------------
# function: Process anchor name end, generated by HTML::TocGenerator.
# args:     - $aAnchorNameEnd: Anchor name end tag to output.
#           - $aToc: Reference to ToC to which anchorname belongs.

sub anchorNameEnd {
		# Get arguments
	my ($self, $aAnchorNameEnd) = @_;
		# Store anchor name as output prefix
	$self->{_outputSuffix} .= $aAnchorNameEnd;
		# Indicate deactive anchor name
	$self->{_activeAnchorName} = undef;
}	# anchorNameEnd()


#--- HTML::TocInsertor::comment() ---------------------------------------------
# function: Process comment.
# args:     - $aComment: comment text with '<!--' and '-->' tags stripped off.

sub comment {
		# Get arguments
	my ($self, $aComment) = @_;
		# Local variables
	my ($tocInsertionPointToken, $doOutput, $origText);
		# Allow ancestor to process the comment tag
	$self->SUPER::comment($aComment);
		# Assemble original comment
	$origText = "<!--$aComment-->";
		# Must ToCs be inserted?
	if ($self->{hti__Mode} & MODE_DO_INSERT) {
		# Yes, ToCs must be inserted;
			# Processing comment as ToC insertion point is successful?
		if (! $self->_processTokenAsInsertionPoint(
			HTML::TocGenerator::TT_TOKENTYPE_COMMENT, $aComment, undef, $origText
		)) {
			# No, comment isn't a ToC insertion point;
				# Output comment normally
			$self->_writeOrBufferOutput($origText);
		}
	}
}  # comment()


#--- HTML::TocInsertor::declaration() -----------------------------------------
# function: This function is called every time a declaration is encountered
#           by HTML::Parser.

sub declaration {
		# Get arguments
	my ($self, $aDeclaration) = @_;
		# Allow ancestor to process the declaration tag
	$self->SUPER::declaration($aDeclaration);
		# Must ToCs be inserted?
	if ($self->{hti__Mode} & MODE_DO_INSERT) {
		# Yes, ToCs must be inserted;
			# Processing declaration as ToC insertion point is successful?
		if (! $self->_processTokenAsInsertionPoint(
			HTML::TocGenerator::TT_TOKENTYPE_DECLARATION, $aDeclaration, undef, 
			"<!$aDeclaration>"
		)) {
			# No, declaration isn't a ToC insertion point;
				# Output declaration normally
			$self->_writeOrBufferOutput("<!$aDeclaration>");
		}
	}
}  # declaration()


#--- HTML::TocInsertor::end() -------------------------------------------------
# function: This function is called every time a closing tag is encountered
#           by HTML::Parser.
# args:     - $aTag: tag name (in lower case).

sub end {
		# Get arguments
	my ($self, $aTag, $aOrigText) = @_;
		# Allow ancestor to process the end tag
	$self->SUPER::end($aTag, $aOrigText);
		# Must ToCs be inserted?
	if ($self->{hti__Mode} & MODE_DO_INSERT) {
		# Yes, ToCs must be inserted;
			# Processing end tag as ToC insertion point is successful?
		if (! $self->_processTokenAsInsertionPoint(
			HTML::TocGenerator::TT_TOKENTYPE_END, $aTag, undef, $aOrigText
		)) {
			# No, end tag isn't a ToC insertion point;
				# Output end tag normally
			$self->_writeOrBufferOutput($aOrigText);
		}
	}
}  # end()


#--- HTML::TocInsertor::insert() ----------------------------------------------
# function: Insert ToC in string.
# args:     - $aToc: (reference to array of) ToC object to insert
#           - $aString: string to insert ToC in
#           - $aOptions: hash reference with optional insertor options

sub insert {
		# Get arguments
	my ($self, $aToc, $aString, $aOptions) = @_;
		# Initialize TocInsertor batch
	$self->_initializeInsertorBatch($aToc, $aOptions);
		# Do insert Toc
	$self->_insert($aString);
		# Deinitialize TocInsertor batch
	$self->_deinitializeInsertorBatch();
}  # insert()


#--- HTML::TocInsertor::insertIntoFile() --------------------------------------
# function: Insert ToCs in file.
# args:     - $aToc: (reference to array of) ToC object(s) to insert.
#           - $aFile: (reference to array of) file(s) to parse for insertion
#                points.
#           - $aOptions: optional insertor options

sub insertIntoFile {
		# Get arguments
	my ($self, $aToc, $aFile, $aOptions) = @_;
		# Initialize TocInsertor batch
	$self->_initializeInsertorBatch($aToc, $aOptions);
		# Do insert ToCs into file
	$self->_insertIntoFile($aFile);
		# Deinitialize TocInsertor batch
	$self->_deinitializeInsertorBatch();
}  # insertIntoFile()


#--- HTML::TocInsertor::number() ----------------------------------------------
# function: Process heading number generated by HTML::Toc.
# args:     - $aNumber

sub number {
		# Get arguments
	my ($self, $aNumber) = @_;
		# Store heading number as output suffix
	$self->{_outputSuffix} .= $aNumber;
}	# number()


#--- HTML::TocInsertor::propagateFile() ---------------------------------------
# function: Propagate ToC; generate & insert ToC, using file as input.
# args:     - $aToc: (reference to array of) ToC object to insert
#           - $aFile: (reference to array of) file to parse for insertion
#                points.
#           - $aOptions: optional insertor options

sub propagateFile {
		# Get arguments
	my ($self, $aToc, $aFile, $aOptions) = @_;
		# Local variables;
	my ($file, @files);
		# Initialize TocInsertor batch
	$self->_initializeInsertorBatch($aToc, $aOptions);
		# Dereference array reference or make array of file specification
	@files = (ref($aFile) =~ m/ARRAY/) ? @$aFile : ($aFile);
		# Loop through files
	foreach $file (@files) {
			# Generate and insert ToC
		$self->_generateFromFile($file);
	}
		# Deinitialize TocInsertor batch
	$self->_deinitializeInsertorBatch();
}  # propagateFile()


#--- HTML::TocInsertor::start() -----------------------------------------------
# function: This function is called every time an opening tag is encountered.
# args:     - $aTag: tag name (in lower case).
#           - $aAttr: reference to hash containing all tag attributes (in lower
#                case).
#           - $aAttrSeq: reference to array containing all tag attributes (in 
#                lower case) in the original order
#           - $aOrigText: the original HTML text

sub start {
		# Get arguments
	my ($self, $aTag, $aAttr, $aAttrSeq, $aOrigText) = @_;
		# Local variables
	my ($doOutput, $i, $tocToken, $tag, $anchorId);
		# Let ancestor process the start tag
	$self->SUPER::start($aTag, $aAttr, $aAttrSeq, $aOrigText);
		# Must ToC be inserted?
	if ($self->{hti__Mode} & MODE_DO_INSERT) {
		# Yes, ToC must be inserted;
			# Processing start tag as ToC insertion point is successful?
		if (! $self->_processTokenAsInsertionPoint(
			HTML::TocGenerator::TT_TOKENTYPE_START, $aTag, $aAttr, $aOrigText
		)) {
			# No, start tag isn't a ToC insertion point;
				# Add anchor id?
			if ($self->{_doAddAnchorIdToStartTag}) {
				# Yes, anchor id must be added;
					# Reset indicator;
				$self->{_doAddAnchorIdToStartTag} = 0;
					# Alias anchor id
				$anchorId = $self->{_anchorId};
					# Attribute 'id' already exists?
				if (defined($aAttr->{id})) {
					# Yes, attribute 'id' already exists;
						# Show warning
					print STDERR "WARNING: Overwriting existing id attribute '" .
						$aAttr->{id} . "' of tag $aOrigText\n";
					
						# Add anchor id to start tag
					$aOrigText =~ s/(id)=\S*([\s>])/$1=$anchorId$2/i;
				}
				else {
					# No, attribute 'id' doesn't exist;
						# Add anchor id to start tag
					$aOrigText =~ s/>/ id=$anchorId>/;
				}
			}
				# Output start tag normally
			$self->_writeOrBufferOutput($aOrigText);
		}
	}
}  # start()


#--- HTML::TocInsertor::text() ------------------------------------------------
# function: This function is called every time plain text is encountered.
# args:     - @_: array containing data.

sub text {
		# Get arguments
	my ($self, $aText) = @_;
		# Let ancestor process the text
	$self->SUPER::text($aText);
		# Must ToC be inserted?
	if ($self->{hti__Mode} & MODE_DO_INSERT) {
		# Yes, ToC must be inserted;
			# Processing text as ToC insertion point is successful?
		if (! $self->_processTokenAsInsertionPoint(
			HTML::TocGenerator::TT_TOKENTYPE_TEXT, $aText, undef, $aText
		)) {
			# No, text isn't a ToC insertion point;
				# Output text normally
			$self->_writeOrBufferOutput($aText);
		}
	}
}  # text()


#=== HTML::_TokenTipParser ====================================================
# function: Parse 'TIP tokens'.  'TIP tokens' mark HTML code which is to be
#           used as the ToC Insertion Point.
# note:     Used internally.

package HTML::_TokenTipParser;


BEGIN {
	use vars qw(@ISA);

	@ISA = qw(HTML::_TokenTocParser);
}


END {}


#--- HTML::_TokenTipParser::new() ---------------------------------------------
# function: Constructor

sub new {
		# Get arguments
	my ($aType, $aTokenArray) = @_;
		# Create instance
	my $self = $aType->SUPER::new;
		# Reference token array
	$self->{tokens} = $aTokenArray;
		# Reference to last added token
	$self->{_lastAddedToken}     = undef;
	$self->{_lastAddedTokenType} = undef;
		# Return instance
	return $self;
}  # new()


#--- HTML::_TokenTipParser::_processAttributes() ------------------------------
# function: Process attributes.
# args:     - $aAttributes: Attributes to parse.

sub _processAttributes {
		# Get arguments
	my ($self, $aAttributes) = @_;
		# Local variables
	my (%includeAttributes, %excludeAttributes);

		# Parse attributes
	$self->_parseAttributes(
		$aAttributes, \%includeAttributes, \%excludeAttributes
	);
		# Include attributes are specified?
	if (keys(%includeAttributes) > 0) {
		# Yes, include attributes are specified;
			# Store include attributes
		@${$self->{_lastAddedToken}}[
			HTML::TocInsertor::TIP_INCLUDE_ATTRIBUTES
		] = \%includeAttributes;
	}
		# Exclude attributes are specified?
	if (keys(%excludeAttributes) > 0) {
		# Yes, exclude attributes are specified;
			# Store exclude attributes
		@${$self->{_lastAddedToken}}[
			HTML::TocInsertor::TIP_EXCLUDE_ATTRIBUTES
		] = \%excludeAttributes;
	}
}  # _processAttributes()


#--- HTML::_TokenTipParser::_processToken() -----------------------------------
# function: Process token.
# args:     - $aTokenType: Type of token to process.
#           - $aTag: Tag of token.

sub _processToken {
		# Get arguments
	my ($self, $aTokenType, $aTag) = @_;
		# Local variables
	my ($tokenArray, $index);
		# Push element on array of update tokens
	$index = push(@{$self->{tokens}[$aTokenType]}, []) - 1;
		# Alias token array to add element to
	$tokenArray = $self->{tokens}[$aTokenType];
		# Indicate last updated token array element
	$self->{_lastAddedTokenType} = $aTokenType;
	$self->{_lastAddedToken}     = \$$tokenArray[$index];
		# Add fields
	$$tokenArray[$index][HTML::TocInsertor::TIP_TOC]         = $self->{_toc};
	$$tokenArray[$index][HTML::TocInsertor::TIP_TOKEN_ID] 	= $aTag;
	$$tokenArray[$index][HTML::TocInsertor::TIP_PREPOSITION] =
		$self->{_preposition};
}  # _processToken()


#--- HTML::_TokenTipParser::comment() -----------------------------------------
# function: Process comment.
# args:     - $aComment: comment text with '<!--' and '-->' tags stripped off.

sub comment {
		# Get arguments
	my ($self, $aComment) = @_;
		# Process token
	$self->_processToken(HTML::TocGenerator::TT_TOKENTYPE_COMMENT, $aComment);
}  # comment()


#--- HTML::_TokenTipParser::declaration() --------------------------------
# function: This function is called every time a markup declaration is
#           encountered by HTML::Parser.
# args:     - $aDeclaration: Markup declaration.

sub declaration {
		# Get arguments
	my ($self, $aDeclaration) = @_;
		# Process token
	$self->_processToken(
		HTML::TocGenerator::TT_TOKENTYPE_DECLARATION, $aDeclaration
	);
}  # declaration()

	
#--- HTML::_TokenTipParser::end() ----------------------------------------
# function: This function is called every time a closing tag is encountered
#           by HTML::Parser.
# args:     - $aTag: tag name (in lower case).

sub end {
		# Get arguments
	my ($self, $aTag, $aOrigText) = @_;
		# Process token
	$self->_processToken(HTML::TocGenerator::TT_TOKENTYPE_END, $aTag);
}  # end()


#--- HTML::_TokenTipParser->setPreposition() ----------------------------------
# function: Set current preposition.

sub setPreposition {
		# Get arguments
	my ($self, $aPreposition) = @_;
		# Set current ToC
	$self->{_preposition} = $aPreposition;
}  # setPreposition()


#--- HTML::_TokenTipParser->setToc() ------------------------------------------
# function: Set current ToC.

sub setToc {
		# Get arguments
	my ($self, $aToc) = @_;
		# Set current ToC
	$self->{_toc} = $aToc;
}  # setToc()


#--- HTML::_TokenTipParser::start() --------------------------------------
# function: This function is called every time an opening tag is encountered.
# args:     - $aTag: tag name (in lower case).
#           - $aAttr: reference to hash containing all tag attributes (in lower
#                case).
#           - $aAttrSeq: reference to array containing all attribute keys (in 
#                lower case) in the original order
#           - $aOrigText: the original HTML text

sub start {
		# Get arguments
	my ($self, $aTag, $aAttr, $aAttrSeq, $aOrigText) = @_;
		# Process token
	$self->_processToken(HTML::TocGenerator::TT_TOKENTYPE_START, $aTag);
		# Process attributes
	$self->_processAttributes($aAttr);
}  # start()


#--- HTML::_TokenTipParser::text() ---------------------------------------
# function: This function is called every time plain text is encountered.
# args:     - @_: array containing data.

sub text {
		# Get arguments
	my ($self, $aText) = @_;
		# Was token already created and is last added token of type 'text'?
	if (
		defined($self->{_lastAddedToken}) && 
		$self->{_lastAddedTokenType} == HTML::TocGenerator::TT_TOKENTYPE_TEXT
	) {
		# Yes, token is already created;
			# Add tag to existing token
		@${$self->{_lastAddedToken}}[HTML::TocGenerator::TT_TAG_BEGIN] .= $aText;
	}
	else {
		# No, token isn't created;
			# Process token
		$self->_processToken(HTML::TocGenerator::TT_TOKENTYPE_TEXT, $aText);
	}
}  # text()


1;