find_symbols.RdFind all symbols used in a function or language object.
find_symbols(x)A language object or function.
A character vector of the symbols used in the object.
# Find all symbols used in the lm function
find_symbols(utils::install.packages)
#> [1] "!" "!="
#> [3] "$" "%in%"
#> [5] "&" "&&"
#> [7] "(" "..."
#> [9] ".Library" ".Platform"
#> [11] ".R_LIBS" ".TkUp"
#> [13] ".find_install_order" ".install.macbinary"
#> [15] ".install.winbinary" ".libPaths"
#> [17] ".make_dependency_list" ".standard_regexps"
#> [19] "::" ":::"
#> [21] "<" "<-"
#> [23] "==" ">"
#> [25] "DL" "GUI"
#> [27] "INSTALL_opts" "NROW"
#> [29] "Ncpus" "OK"
#> [31] "OS.type" "R.home"
#> [33] "R.version" "Sys.getenv"
#> [35] "Sys.getpid" "Sys.glob"
#> [37] "Sys.setenv" "Sys.which"
#> [39] "[" "[["
#> [41] "aDL" "action"
#> [43] "all" "ans"
#> [45] "any" "args"
#> [47] "args0" "as.numeric_version"
#> [49] "askYesNo" "av"
#> [51] "av1" "av2"
#> [53] "available" "available.packages"
#> [55] "available_packages_filters_db" "available_packages_filters_default"
#> [57] "basename" "bins"
#> [59] "binvers" "c"
#> [61] "capabilities" "cat"
#> [63] "cbind" "character"
#> [65] "clean" "close"
#> [67] "cmd" "cmd0"
#> [69] "colnames" "config"
#> [71] "configure.args" "configure.vars"
#> [73] "conn" "contrib.url"
#> [75] "contriburl" "contriburl2"
#> [77] "cwd" "data.frame"
#> [79] "dependencies" "deps"
#> [81] "destdir" "destfile"
#> [83] "df" "dir"
#> [85] "dir.create" "dir.exists"
#> [87] "dirname" "dirs"
#> [89] "download.file" "download.packages"
#> [91] "e" "endsWith"
#> [93] "env" "f"
#> [95] "f2" "failed"
#> [97] "fil" "file"
#> [99] "file.access" "file.copy"
#> [101] "file.exists" "file.path"
#> [103] "files" "filters"
#> [105] "flush.console" "fn"
#> [107] "for" "found"
#> [109] "foundpkgs" "function"
#> [111] "getConfigureArgs" "getConfigureVars"
#> [113] "getDependencies" "getDeps"
#> [115] "getOption" "get_install_opts"
#> [117] "get_package_name" "get_timeout"
#> [119] "gettext" "gettextf"
#> [121] "getwd" "grep"
#> [123] "grepl" "gsub"
#> [125] "hasArchs" "hasSrc"
#> [127] "have_spaces" "i"
#> [129] "if" "inherits"
#> [131] "interactive" "inuse"
#> [133] "invisible" "is.character"
#> [135] "is.list" "is.logical"
#> [137] "is.na" "is.null"
#> [139] "isTRUE" "keep_outputs"
#> [141] "later" "length"
#> [143] "lib" "libpath"
#> [145] "libs_only" "libs_used"
#> [147] "list" "make.packages.html"
#> [149] "match" "message"
#> [151] "method" "mfile"
#> [153] "missing" "msg"
#> [155] "n" "na"
#> [157] "names" "nchar"
#> [159] "needsCmp" "next"
#> [161] "ngettext" "nonlocalrepos"
#> [163] "normalizePath" "nrow"
#> [165] "nzchar" "ok"
#> [167] "oldrlibs" "on.exit"
#> [169] "out" "outdir"
#> [171] "outfile" "outfiles"
#> [173] "output" "p"
#> [175] "p0" "paste"
#> [177] "paste0" "path.expand"
#> [179] "path.sep" "pkg"
#> [181] "pkgType" "pkgnames"
#> [183] "pkgs" "platform"
#> [185] "print" "quiet"
#> [187] "readLines" "repos"
#> [189] "res" "return"
#> [191] "row.names" "rownames"
#> [193] "s2" "sQuote"
#> [195] "search" "select.list"
#> [197] "seq_len" "setdiff"
#> [199] "setwd" "shQuote"
#> [201] "shortPathName" "sort"
#> [203] "sort.list" "sprintf"
#> [205] "srcOnly" "srcpkgs"
#> [207] "srcvers" "startsWith"
#> [209] "status" "stderr"
#> [211] "stop" "strsplit"
#> [213] "strwrap" "sub"
#> [215] "sum" "suppressWarnings"
#> [217] "system" "system2"
#> [219] "tcltk" "tempdir"
#> [221] "tempfile" "this"
#> [223] "timeout" "tlim"
#> [225] "tlim_cmd" "tmpd"
#> [227] "tmpd2" "tolower"
#> [229] "tools" "try"
#> [231] "tryCatch" "tss"
#> [233] "type" "type2"
#> [235] "unique" "unlink"
#> [237] "unlist" "update"
#> [239] "upkgs" "urls"
#> [241] "userdir" "valid_package_version"
#> [243] "verbose" "warning"
#> [245] "web" "writeLines"
#> [247] "{" "|"
#> [249] "||"
# Does not find names of arguments
find_symbols(quote(foo(a = A)))
#> [1] "A" "foo"
#> [1] "A" "foo"
find_symbols(quote(function(x = X) NULL))
#> [1] "X" "function"
#> [1] "function" "X"