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Automatically determine prefix and suffix from tags #172

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Automatically determine prefix and suffix from tags #172

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170b0c4
Automatically determine `prefix` and `suffix` from `levels`
Apr 26, 2020
8ba3edb
Avoid using regexps to find substring
Apr 30, 2020
53e7902
Convert `level` to `character`
Apr 30, 2020
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51 changes: 43 additions & 8 deletions R/plot_annotation.R
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Original file line number Diff line number Diff line change
Expand Up @@ -91,15 +91,34 @@ ggplot_add.plot_annotation <- function(object, plot, object_name) {
#' @importFrom utils as.roman
recurse_tags <- function(x, levels, prefix, suffix, sep, offset = 1) {
if (length(levels) == 0) return(list(patches = x, tab_ind = offset))
level <- switch(
as.character(levels[1]),
a = letters,
A = LETTERS,
"1" = 1:100,
i = tolower(as.roman(1:100)),
I = as.roman(1:100),

levels <- as.character(levels[1])
if (grepl("a", levels)) {
level <- letters
} else if (grepl("A", levels)) {
level <- LETTERS
} else if (grepl("1", levels)) {
level <- 1:100
} else if (grepl("i", levels)) {
level <- tolower(as.roman(1:100))
} else if (grepl("I", levels)) {
level <- as.roman(1:100)
} else {
stop('Unknown tag type: ', levels[1], call. = FALSE)
)
}

if (prefix == "" && nchar(levels > 1)) {
index <- find_index_substr(levels, as.character(level[1]))
if (index > 1) {
prefix <- substr(levels, 1, index - 1)
}
}

if (suffix == "" && nchar(levels > 1)) {
index <- find_index_substr(levels, as.character(level[1]))
suffix <- substr(levels, index + 1, nchar(levels))
}

patches <- x$patches$plots
tag_ind <- offset
for (i in seq_along(patches)) {
Expand Down Expand Up @@ -133,6 +152,22 @@ recurse_tags <- function(x, levels, prefix, suffix, sep, offset = 1) {
tag_ind = tag_ind
)
}
find_index_substr <- function(string, substring) {
index <- 1
match <- FALSE
while (index <= nchar(string) && !match) {
if (substr(string, index, index) == substring) {
match <- TRUE
} else {
index <- index + 1
}
}
if (match) {
return(index)
} else {
return(NA)
}
}
#' @importFrom ggplot2 ggplot labs ggplotGrob
#' @importFrom gtable gtable_add_rows gtable_add_cols
#' @importFrom grid unit
Expand Down