##########################################################################
# 16.POS.of.-3.previous.token tier extractor for Wagon: 
#  Written by Kyuchul Yoon ( kyoon@ling.osu.edu )
# Extracts from a set of .TextGrid.lab files 16.POS.of.-3.previous.token data field for Wagon training
# The script assumes that you already have the TextGrid files labelled by professional K-ToBI labelers.
# The script will read in all the TextGrid.lab files one by one from the directory 15.POS.of.current.token
# and write the output files into 10.wagon-features\16.POS.of.-3.previous.token
# The filename of the output files are .wagon.16
# Assumes that you have a token/POS column in a file 055.POS-big-original\ejk-tok.-3.POS
# This script splits a column of token/POS pairs into POSs of each sentence separated by SFN (POS)
##########################################################################

form Select files
	word tokenFile_(with_path) 055.POS-big-original\ejk-tok.-3.POS
	word subFolderToProcess 10.wagon-features\15.POS.of.current.token
	word fileExtOfDoneFiles wagon.15
	word outputSubFolder 10.wagon-features\16.POS.of.-3.previous.token
	word tierNameToAdd POS.of.-3.previous.token
	choice outputFileExt: 1
		button wagon.16
endform

Read Strings from raw text file... 'tokenFile$'
Rename... tokenFile

# Get the list of filenames of TextGrid. files
Create Strings as file list... fileList 'subFolderToProcess$'\*.'fileExtOfDoneFiles$'
Sort
numFiles = Get number of strings
pause 'numFiles' labeled textgrids identified.  Continue?

# Initialize the line number for .POS file.  Will be used for giving info when discrepancy exists btw/
# the numbers of POSs and intervals. And iLineNumPOS for extracting one token at a time from the .POS file.
# And numPOS for number of POSs in one sentence in the .POS file
lineNumPOS = 1
iLineNumPOS = 1
numPOS = 0

# Loop throught each file
for iFile to numFiles
	select Strings fileList
	# Get the name for a TextGrid file
	doneFile$ = Get string... iFile
	filePrefix$ = doneFile$ - fileExtOfDoneFiles$
	Read from file... 'subFolderToProcess$'\'doneFile$'
	Rename... textGrid
	numIntervals = Get number of intervals... 1
	numTiers = Get number of tiers
	Duplicate tier... 1 (numTiers+1) 'tierNameToAdd$'

	# Set the first/last interval text to naught
	Set interval text... (numTiers+1) 1
	Set interval text... (numTiers+1) numIntervals

	for iToken from 2 to (numIntervals-1)
		# If the token is followed by "#", then take letters between / and #
		# Otherwise, take what's on the RHS of the slash
		select Strings tokenFile
		token$ = Get string... iLineNumPOS
		lengthOfToken = length(token$)
		positionOfSlash = index(token$, "/")
		restAfterSlash$ = right$(token$, (lengthOfToken-positionOfSlash))
		lengthOfRestAfterSlash = length(restAfterSlash$)
		rightMostLetter$ = right$(restAfterSlash$, 1)
		if rightMostLetter$ = "#"
			realPOS$ = left$(restAfterSlash$, (lengthOfRestAfterSlash-1))
		else
			realPOS$ = restAfterSlash$ 
		endif
	
		# Put the POS label into each interval
		select TextGrid textGrid
		
		# The first three intervals should always be zero
		if iToken < 5
			Set interval text... (numTiers+1) iToken 0
		else
			Set interval text... (numTiers+1) iToken 'realPOS$'
		endif
	
		iLineNumPOS = iLineNumPOS + 1
	endfor
Edit
pause
	Write to text file... 'outputSubFolder$'\'filePrefix$''outputFileExt$'
	Remove
endfor	
select Strings fileList
Remove

#### END OF SCRIPT ####