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# internal function for use with createMrBayesTipDatingNexus
parseNexusFile <- function(origNexusFile = origNexusFile,asIs = TRUE){
# if asIs, then the morph Nexus never gets broken down or parsed beyond being scanned
morphNexusAsIs <- readLines(con = origNexusFile,warn = FALSE)
if(!asIs){
# cleaner form based on ape's read.nexus.data
morphNexus <- scan(file = origNexusFile,what = character(), sep = "\n",
quiet = TRUE, comment.char = "[", strip.white = TRUE)
#
# find the NTAX line
ntaxLine <- grepl(morphNexus,pattern = "\\bNTAX",ignore.case = TRUE)
if(sum(ntaxLine)>1){
stop("More than one line containing 'NTAX' found in the provided NEXUS file")}
if(sum(ntaxLine)<1){
stop("No line containing 'NTAX' found in the provided NEXUS file")}
# get number of taxa (more regexp borrowed from read.nexus.data)
oldNtax <- as.numeric(sub("(.+?)(ntax\\s*\\=\\s*)(\\d+)(.+)",
"\\3", morphNexus[ntaxLine], perl = TRUE, ignore.case = TRUE))
# get other pieces of ntax line
ntaxLineFirst <- sub("(.+?)(ntax\\s*\\=\\s*)(\\d+)(.+)",
"\\1\\2", morphNexus[ntaxLine], perl = TRUE, ignore.case = TRUE)
ntaxLineLast <- sub("(.+?)(ntax\\s*\\=\\s*)(\\d+)(.+)",
"\\4", morphNexus[ntaxLine], perl = TRUE, ignore.case = TRUE)
#
# find the matrix line
matrixLine <- grepl(morphNexus,pattern = "\\bMATRIX",ignore.case = TRUE)
if(sum(matrixLine)>1){
stop("More than one line containing 'MATRIX' found in the provided NEXUS file")
}
if(sum(matrixLine)<1){
stop("No line containing 'MATRIX' found in the provided NEXUS file")
}
#
# find the next semi-colon line
matrixEnd <- (which(matrixLine):length(morphNexus))[
grepl(morphNexus[which(matrixLine):length(morphNexus)],
pattern = ";")][1]
if(length(matrixEnd) != 1){
stop("Cannot find semicolon on line following 'MATRIX' line in NEXUS file")
}
############################################
# get Header 1 - start to line right before ntax
headerOne <- morphNexus[1:(which(ntaxLine)-1)]
# get header 2 - line right after ntax to MATRIX
headerTwo <- morphNexus[(which(ntaxLine)+1):which(matrixLine)]
# get footer - new semicolon line, + semicolon+1 to end
footer <- c(";",morphNexus[(matrixEnd+1):length(morphNexus)])
#####################################################################
# get taxon data
#
# isolate the lines after matrix, to semicolon
taxonLines <- morphNexus[(which(matrixLine)+1):matrixEnd]
# remove semicolon only lines
taxonLines <- gsub(";","",taxonLines)
taxonLines <- taxonLines[taxonLines != ""]
taxonLines <- gsub("\t"," ",taxonLines)
# NOW it should be equal to number of taxa
# (note if character across multiple lines, would be problematic...)
if(length(taxonLines) != oldNtax){
stop("The number of apparent lines in the matrix of the input NEXUS file doesn't match the given NTAX in the header of that file")
}
#
# now to get the taxon names and character codings
taxonData <- regmatches(taxonLines, regexpr(" ", taxonLines), invert = TRUE)
# clean of whitespace - actually this really isn't necessary
#taxonData <- lapply(taxonData,sapply,function(z) gsub(pattern = " ",replacement = "",z))
#taxonData <- lapply(taxonData,sapply,function(z) gsub(pattern = "\\t",replacement = "",z))
# get names
taxonNames <- sapply(taxonData,function(z) z[[1]])
charData <- sapply(taxonData,function(z) z[[2]])
#
#########################################
# make a function
#
remakeDataBlockFun <- function(newTaxaTable,taxonNames){
# given data on new taxa (with old taxa), rebuild NEXUS block
# input: a matrix with column 1 = new taxon names
# column 2 = old taxon names
# identify all old taxa
origMatch <- sapply(newTaxaTable[,2],function(x) which(x == taxonNames))
if(is.list(origMatch)){
stop("more than one match of taxon names when remaking data NEXUS block")
}
# test that all old taxa are in taxonNames
if(any(is.na(origMatch))){
stop("No match for original taxon name when remaking data NEXUS block")
}
###############################
# make the new character matrix lines
newData <- cbind(newTaxaTable[,1],charData[origMatch])
newTaxonBlock <- apply(newData,1,function(x) paste0(x[1]," ",x[2]))
##################
# make the new block
#
# get new ntax line with new ntax
newNtaxValue <- nrow(newTaxaTable)
newNtaxLine <- paste0(ntaxLineFirst," ",newNtaxValue," ",ntaxLineLast)
# make new block
newBlock <- c(headerOne,newNtaxLine,headerTwo,
"",newTaxonBlock,"",footer)
return(newBlock)
}
#
#if NOT asIs, need to output names, and a function for rebuilding NEXUS file
res <- list(taxonNames = taxonNames,remakeDataBlockFun = remakeDataBlockFun,morphNexusAsIs = morphNexusAsIs)
}else{
#if just asIs
res <- morphNexusAsIs
}
return(res)
}
# origNexusFile <- "D:\\dave\\workspace\\mrbayes\\mat.nex"
# parseNexusFile(origNexusFile = origNexusFile,asIs = TRUE)
# parseNexusFile(origNexusFile,asIs = FALSE)
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