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context("Tokenizer")
compare_tokens <- function(tokens, expected) {
if (is.character(tokens))
tokens <- tokenize_string(tokens)
expect_true(
nrow(tokens) == length(expected),
"different number of tokens"
)
for (i in 1:nrow(tokens)) {
expect_true(
tokens$value[[i]] == expected[[i]],
paste0("expected token '", tokens$value[[i]], "'; got '", expected[[i]], "'")
)
}
}
test_that("Operators are tokenized correctly", {
operators <- c(
"::", ":::", "$", "@", "[", "[[", "^", "-", "+", ":",
"*", "/", "+", "-", "<", ">", "<=", ">=", "==", "!=",
"!", "&", "&&", "|", "||", "~", "->", "->>", "<-", "<<-",
"=", "?", "**", "%%", "%for%"
)
tokenized <- tokenize_string(paste(operators, collapse = " "))
for (operator in operators) {
tokens <- tokenize_string(operator)
expect_true(nrow(tokens) == 1, paste("expected a single token ('", operator, "')"))
}
})
test_that("Numbers are tokenized correctly", {
numbers <- c("1", "1.0", "0.1", ".1", "0.1E1", "1L", "1.0L", "1.5L",
"1E1", "1E-1", "1E-1L", ".100E-105L", "0.", "100.",
"1e+09", "1e+90", "1e-90", "1e-00000000000000009")
for (number in numbers) {
tokens <- tokenize_string(number)
expect_true(nrow(tokens) == 1, paste("expected a single token ('", number, "')", sep = ""))
token <- as.list(tokens[1, ])
expect_true(token$type == "number", paste("expected a number ('", token$type, "')", sep = ""))
}
})
test_that("The tokenizer accepts UTF-8 symbols", {
expect_true(nrow(tokenize_string("鬼")) == 1)
})
test_that("The tokenizer works correctly", {
# TODO: Should newlines be absorbed as part of the comment string?
tokens <- tokenize_string("# A Comment\n")
expected <- "# A Comment\n"
compare_tokens(tokens, expected)
tokens <- tokenize_string("a <- 1 + 2\n")
compare_tokens(
tokens,
c("a", " ", "<-", " ", "1", " ", "+", " ", "2", "\n")
)
compare_tokens(
tokenize_string("a<-1"),
c("a", "<-", "1")
)
# NOTE: '-' sign tokenized separately from number
compare_tokens(
tokenize_string("a< -1"),
c("a", "<", " ", "-", "1")
)
compare_tokens("1.0E5L", "1.0E5L")
compare_tokens(".1", ".1")
compare_tokens("'\\''", "'\\''")
compare_tokens(".a", ".a")
compare_tokens("...", "...")
compare_tokens(":=", ":=")
compare_tokens("x ** 2", c("x", " ", "**", " ", "2"))
})
test_that("`[[` and `[` are tokenized correctly", {
compare_tokens("x[[1]]", c("x", "[[", "1", "]]"))
# not really valid R code, but the tokenizer should still
# get it right
compare_tokens("[[[]]]", c("[[", "[", "]", "]]"))
compare_tokens(
"x[[a[b[[c[1]]]]]]",
c("x", "[[", "a", "[", "b", "[[", "c", "[", "1",
"]", "]]", "]", "]]")
)
})
test_that("Failures during number tokenization is detected", {
tokens <- tokenize_string("1.5E---")
expect_true(tokens$type[[1]] == "invalid")
})
test_that("invalid number e.g. 1E1.5 tokenized as single entity", {
tokens <- tokenize_string("1E1.5")
expect_true(nrow(tokens) == 1)
expect_true(tokens$type[[1]] == "invalid")
})
test_that("keywords are tokenized as keywords", {
keywords <- c("if", "else", "repeat", "while", "function",
"for", "in", "next", "break",
"TRUE", "FALSE", "NULL", "Inf", "NaN", "NA",
"NA_integer_", "NA_real_", "NA_complex_", "NA_character_")
tokens <- lapply(keywords, function(keyword) {
tokenize_string(keyword)[1, ]
})
types <- unlist(lapply(tokens, `[[`, "type"))
expect_true(all(types == "keyword"))
})
test_that("comments without a trailing newline are tokenized", {
tokens <- tokenize_string("# abc")
expect_identical(tokens$type, "comment")
})
test_that("tokenization errors handled correctly", {
# previously, these reported an error where a NUL
# byte was accidentally included as part of the
# token value
tokenize_string("`abc")
tokenize_string("'abc")
tokenize_string("\"abc")
tokenize_string("%abc")
})
test_that("files in packages are tokenized without errors", {
skip_on_cran()
paths <- list.dirs("~/git", full.names = TRUE, recursive = FALSE)
packages <- paths[file.exists(file.path(paths, "DESCRIPTION"))]
R <- file.path(packages, "R")
for (dir in R) {
files <- list.files(dir, pattern = "R$", full.names = TRUE)
for (file in files) {
tokens <- tokenize_file(file)
errors <- tokens$type == "invalid"
expect_true(all(errors == FALSE))
}
}
})
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