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# Copyright (C) 2021 Brodie Gaslam
#
# This file is part of "diffobj - Diffs for R Objects"
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# Go to <https://www.r-project.org/Licenses/GPL-2> for a copy of the license.
# Compute all the different gutter components and report max width
gutter_dat <- function(etc) {
stopifnot(is(etc, "Settings"))
old.opt <- options(crayon.enabled=TRUE)
on.exit(options(old.opt))
funs <- etc@style@funs
text <- etc@style@text
# get every slot except the pad slot; we'll then augment them so they have
# all the same number of characters if the style class inherits from
# Raw, which should be the case for raw, ansi8 and ansi255. Finally apply
# functions; note we assume the provided gutter characters don't contain
# ANSI escapes. We're a bit sloppy here with how we pull the relevant stuff
slot.nm <- slotNames(text)
slots <- slot.nm[grepl("^gutter\\.", slot.nm) & slot.nm != "gutter.pad"]
gutt.txt <- vapply(slots, slot, character(1L), object=text)
gutt.dat <- if(is(etc@style, "Raw")) format(gutt.txt) else gutt.txt
gutt.format.try <- try({
gutt.dat.format <- vapply(
slots,
function(x) slot(funs, sprintf("%s", x))(gutt.dat[x]),
character(1L)
)
gutt.dat.format.pad <-
funs@gutter(paste0(gutt.dat.format, funs@gutter.pad(text@gutter.pad)))
})
if(inherits(gutt.format.try, "try-error"))
stop(
"Failed attempting to apply gutter formatting functions; if you did not ",
"customize them, contact maintainer. See `?StyleFuns`."
)
names(gutt.dat.format.pad) <- sub("^gutter\\.", "", names(gutt.dat.format))
gutt.max.w <- max(
etc@style@nchar.fun(gutt.dat.format.pad, sgr.supported=etc@sgr.supported)
)
gutt.args <- c(
list("Gutter"), as.list(gutt.dat.format.pad),
list(width=gutt.max.w)
)
do.call("new", gutt.args)
}
# Based on the type of each row in a column, render the correct gutter
render_gutters <- function(types, lens, lens.max, etc) {
gutter.dat <- etc@gutter
Map(
function(dat, lens, lens.max) {
Map(
function(type, len, len.max) {
if(
type %in% c(
"insert", "delete", "match", "guide", "fill", "context.sep"
)
) {
c(
if(len) slot(gutter.dat, as.character(type)),
rep(
slot(gutter.dat, paste0(type, ".", "ctd")), max(len - 1L, 0L)
),
rep(slot(gutter.dat, "fill"), max(len.max - len, 0L))
)
} else character(len)
},
dat, lens, lens.max
)
},
types, lens, lens.max
)
}
render_col <- function(gutter, col, type, etc) {
lens <- vapply(col, length, integer(1L))
gutt.ul <- unlist(gutter)
col.txt <- paste0(gutt.ul, unlist(col))
type.ul <- unlist(type)
es <- etc@style@funs
# line formats
col.txt[type.ul == "banner.insert"] <-
es@banner(es@banner.insert(col.txt[type.ul == "banner.insert"]))
col.txt[type.ul == "banner.delete"] <-
es@banner(es@banner.delete(col.txt[type.ul == "banner.delete"]))
col.txt[type.ul == "insert"] <-
es@line(es@line.insert(col.txt[type.ul == "insert"]))
col.txt[type.ul == "delete"] <-
es@line(es@line.delete(col.txt[type.ul == "delete"]))
col.txt[type.ul == "match"] <-
es@line(es@line.match(col.txt[type.ul == "match"]))
col.txt[type.ul == "guide"] <-
es@line(es@line.guide(col.txt[type.ul == "guide"]))
col.txt[type.ul == "fill"] <-
es@line(es@line.fill(col.txt[type.ul == "fill"]))
col.txt[type.ul == "context.sep"] <-
es@line(es@context.sep(col.txt[type.ul == "context.sep"]))
col.txt[type.ul == "header"] <- es@line(col.txt[type.ul == "header"])
col.txt
}
render_cols <- function(cols, gutters, types, etc) {
Map(render_col, gutters, cols, types, MoreArgs=list(etc=etc))
}
render_rows <- function(cols, etc) {
col.txt <- do.call(paste, c(cols, list(sep=etc@style@text@pad.col)))
etc@style@funs@row(col.txt)
}
# Create a dummy row so we can compute display width for scaling display in
# HTML mode
#
# @param x a `Diff` object
make_dummy_line <- function(x, dummy.text, type) {
stopifnot(is.chr.1L(type) && type %in% c("line", "banner"))
fns <- x@etc@style@funs
txt <- x@etc@style@text
line_fun <- slot(fns, type)
line_ins_fun <- slot(fns, sprintf("%s.insert", type))
line_del_fun <- slot(fns, sprintf("%s.delete", type))
if(x@etc@mode == "sidebyside") {
sprintf(
"%s%s%s",
line_fun(
line_del_fun(
sprintf(
"%s%s", x@etc@gutter@delete, fns@text(fns@text.delete(dummy.text))
) ) ),
txt@pad.col,
line_fun(
line_ins_fun(
sprintf(
"%s%s", x@etc@gutter@insert, fns@text(fns@text.insert(dummy.text))
) ) ) )
} else {
line_fun(
line_del_fun(
sprintf(
"%s%s", x@etc@gutter@delete, fns@text(fns@text.delete(dummy.text))
) ) )
}
}
make_dummy_row <- function(x) {
cont.meta <-
make_dummy_line(x, paste0(rep("a", x@etc@text.width), collapse=""), "line")
banner.meta <- make_dummy_line(x, x@etc@style@blank.sub, "banner")
fns <- x@etc@style@funs
sprintf(
"<div id='diffobj_meta' style='%s'>
<div id='diffobj_banner_meta'>%s</div>
<div id='diffobj_content_meta'>%s</div>
</div>",
"display: none; position: absolute; top: 0px; z-index: -1;",
fns@container(fns@row(banner.meta)),
fns@container(fns@row(cont.meta))
)
}
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