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FS2-3518: support data frame subscripting #119

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FS2-3518: support data frame subscripting #119

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b396f2c
WIP
JustinCCYap May 7, 2025
8b8013c
Revert "WIP"
JustinCCYap May 7, 2025
553f028
Support data frame subscripting
JustinCCYap May 8, 2025
fa9add2
Add tests
JustinCCYap May 12, 2025
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70 changes: 60 additions & 10 deletions R/table-subscript.R
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Original file line number Diff line number Diff line change
Expand Up @@ -15,17 +15,19 @@
# Catch empty input e.g. x[] or x[drop = TRUE/FALSE] (when ... is empty)
if (empty.ind) return(x)

input.is.data.frame <- is.data.frame(x)

# Force array class for custom QTable subscripting code
input.is.not.array <- !is.array(x)
if (input.is.not.array)
if (input.is.not.array && !input.is.data.frame)
x <- as.array(x)

DUPLICATE.LABEL.SUFFIX <- "_@_"
x <- deduplicateQTableLabels(x, DUPLICATE.LABEL.SUFFIX)

x.dim <- dim(x)
n.dim <- length(x.dim)
if (n.dim > 0 && !is.null(dimnames(x)) && is.null(names(dimnames(x))))
if (n.dim > 0 && !is.null(dimnames(x)) && is.null(names(dimnames(x))) && !input.is.data.frame)
x <- nameDimensionAttributes(x)

n.index.args <- nargs() - 1L - !missing(drop)
Expand All @@ -47,8 +49,20 @@
if (!identical(as.character(called.args[[i]]), ""))
evaluated.args[[i]] <- eval(called.args[[i]], parent.frame())

if (input.is.data.frame) {
evaluated.args <- mapArgsFromDataFrame(evaluated.args, FALSE)
}

if (input.is.data.frame) {
x2 <- as.matrix(x)
mostattributes(x2) <- c(attributes(x2)[isBasicAttribute(names(attributes(x2)))],
attributes(x)[!isBasicAttribute(names(attributes(x)))])
}
else
x2 <- x

# Update Attributes here
y <- updateTableAttributes(y, x, called.args, evaluated.args, drop = drop,
y <- updateTableAttributes(y, x2, evaluated.args, drop = drop,
missing.names, DUPLICATE.LABEL.SUFFIX)
y <- updateNameAttribute(y, attr(x, "name"), called.args, "[")
throwWarningIfDuplicateLabels(x, evaluated.args, sep = DUPLICATE.LABEL.SUFFIX)
Expand All @@ -57,7 +71,7 @@
if (missing.names)
y <- unname(y)

if (input.is.not.array && is.array(y))
if (input.is.not.array && !input.is.data.frame && is.array(y))
y <- dropTableToVector(y)

y
Expand All @@ -77,9 +91,12 @@
StopForUserError("exact argument should be TRUE or FALSE")
called.args <- match.call(expand.dots = FALSE)
empty.ind <- providedArgumentEmpty(called.args, optional.arg = "exact")

input.is.data.frame <- is.data.frame(x)

# Force array class for custom QTable subscripting code
input.is.not.array <- !is.array(x)
if (input.is.not.array)
if (input.is.not.array && !input.is.data.frame)
x <- as.array(x)

DUPLICATE.LABEL.SUFFIX <- "_@_"
Expand All @@ -106,10 +123,14 @@
all.unit.length <- all(lengths(evaluated.args) == 1L)
valid.args <- all.unit.length && (single.arg || correct.n.args)

if (!valid.args)
if (!valid.args && !input.is.data.frame)
throwErrorTableDoubleIndex(input.name, x.dim)

if (n.dim > 0 && !is.null(dimnames(x)) && is.null(names(dimnames(x))))
if (input.is.data.frame) {
evaluated.args <- mapArgsFromDataFrame(evaluated.args, TRUE)
}

if (n.dim > 0 && !is.null(dimnames(x)) && is.null(names(dimnames(x))) && !input.is.data.frame)
x <- nameDimensionAttributes(x)

missing.names <- is.null(dimnames(x))
Expand All @@ -118,8 +139,16 @@

y <- NextMethod(`[[`, x)

if (input.is.data.frame) {
x2 <- as.matrix(x)
mostattributes(x2) <- c(attributes(x2)[isBasicAttribute(names(attributes(x2)))],
attributes(x)[!isBasicAttribute(names(attributes(x)))])
}
else
x2 <- x
Comment on lines +145 to +151
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I don't quite understand this.

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@JustinCCYap JustinCCYap May 8, 2025 •
edited
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The idea is to pass a matrix with the same dimensions and attributes as the data frame to updateTableAttributes, so that existing code works to modify the attributes.


# Update Attributes here
y <- updateTableAttributes(y, x, called.args, evaluated.args, drop = TRUE, missing.names)
y <- updateTableAttributes(y, x2, evaluated.args, drop = TRUE, missing.names)
y <- updateNameAttribute(y, attr(x, "name"), called.args, "[[")
y <- removeDeduplicationSuffixFromLabels(y, DUPLICATE.LABEL.SUFFIX)
if (missing.names)
Expand Down Expand Up @@ -239,7 +268,7 @@ throwErrorOnlyNamed <- function(named.arg, function.name) {
sQuote(function.name))
}

isBasicAttribute <- function(attribute.names, basic.attr = c("dim", "names", "dimnames", "class")) {
isBasicAttribute <- function(attribute.names, basic.attr = c("dim", "names", "dimnames", "class", "row.names")) {
attribute.names %in% basic.attr
}

Expand All @@ -259,7 +288,7 @@ IsQTableAttribute <- function(attribute.names,
attribute.names %in% qtable.attrs
}

updateTableAttributes <- function(y, x, called.args, evaluated.args, drop = TRUE,
updateTableAttributes <- function(y, x, evaluated.args, drop = TRUE,
original.missing.names = FALSE, sep = "_@_") {
class(y) <- c("QTable", class(y))
y.attributes <- attributes(y)
Expand Down Expand Up @@ -1035,3 +1064,24 @@ productNameOrIsNotQ <- function() {
if (is.null(product.name)) return(TRUE)
length(product.name) == 1L && product.name != "Q"
}

mapArgsFromDataFrame <- function(evaluated.args, is.double.bracket) {
# single bracket, single parameter, multiple elements [x] -> [TRUE, x]
if (!is.double.bracket && length(evaluated.args) == 1) {
evaluated.args <- c(TRUE, evaluated.args)
}

# double bracket, single parameter, single element [[x]] -> [, x]
if (is.double.bracket && length(evaluated.args) == 1 &&
length(evaluated.args[[1]]) == 1) {
evaluated.args <- c(TRUE, evaluated.args)
}

# double bracket, single parameter, double element [[x]] -> [x2, x1]
if (is.double.bracket && length(evaluated.args) == 1 &&
length(evaluated.args[[1]]) == 2) {
evaluated.args <- list(evaluated.args[[1]][2], evaluated.args[[1]][1])
}

evaluated.args
}