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strgraphwrap <-
function (x, width = 0.9 * getOption("width"),
indent = 0, exdent = 0,
prefix = "", simplify = TRUE, units='user', cex=NULL)
{
if (!is.character(x))
x <- as.character(x)
spc.len <- strwidth(" ", units=units, cex=cex)
prefix.len <- strwidth(prefix, units = units, cex=cex)
indentString <- paste(rep.int(" ", indent), collapse = "")
indent <- indent * spc.len
exdentString <- paste(rep.int(" ", exdent), collapse = "")
exdent <- exdent * spc.len
y <- list()
z <- lapply(strsplit(x, "\n[ \t\n]*\n"), strsplit, "[ \t\n]")
for (i in seq_along(z)) {
yi <- character(0)
for (j in seq_along(z[[i]])) {
words <- z[[i]][[j]]
nc <- strwidth(words, units=units, cex=cex)
if (any(is.na(nc))) {
nc0 <- strwidth(words, units=units, cex=cex)
nc[is.na(nc)] <- nc0[is.na(nc)]
}
if (any(nc == 0)) {
zLenInd <- which(nc == 0)
zLenInd <- zLenInd[!(zLenInd %in% (grep("\\.$",
words) + 1))]
if (length(zLenInd) > 0) {
words <- words[-zLenInd]
nc <- nc[-zLenInd]
}
}
if (length(words) == 0) {
yi <- c(yi, "", prefix)
next
}
currentIndex <- 0
lowerBlockIndex <- 1
upperBlockIndex <- integer(0)
lens <- cumsum(nc + spc.len)
first <- TRUE
maxLength <- width - prefix.len -
indent
while (length(lens) > 0) {
k <- max(sum(lens <= maxLength), 1)
if (first) {
first <- FALSE
maxLength <- maxLength + indent - exdent
}
currentIndex <- currentIndex + k
if (nc[currentIndex] == 0)
upperBlockIndex <- c(upperBlockIndex, currentIndex -
1)
else upperBlockIndex <- c(upperBlockIndex, currentIndex)
if (length(lens) > k) {
if (nc[currentIndex + 1] == 0) {
currentIndex <- currentIndex + 1
k <- k + 1
}
lowerBlockIndex <- c(lowerBlockIndex, currentIndex +
1)
}
if (length(lens) > k)
lens <- lens[-(1:k)] - lens[k]
else lens <- NULL
}
nBlocks <- length(upperBlockIndex)
s <- paste(prefix, c(indentString, rep.int(exdentString,
nBlocks - 1)), sep = "")
for (k in (1:nBlocks)) s[k] <- paste(s[k], paste(words[lowerBlockIndex[k]:upperBlockIndex[k]],
collapse = " "), sep = "")
yi <- c(yi, s, prefix)
}
y <- if (length(yi))
c(y, list(yi[-length(yi)]))
else c(y, "")
}
if (simplify)
y <- unlist(y)
y
}
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