Remove purrr dependency

DESCRIPTION

@@ -18,7 +18,6 @@ Language: en-GB
 Depends: 
     R (>= 2.10)
 Imports:
-    purrr (>= 0.3.4),
     rlang (>= 0.4.7),
     utils
 Suggests: 

NEWS.md

@@ -1,6 +1,6 @@
 # r2eng 0.0.0.9006
 
-* Removed {lintr} dependency.
+* Removed {lintr} and {purrr} dependenies.
 
 # r2eng 0.0.0.9005
 

R/translate.R

@@ -1,15 +1,19 @@
 #' @rdname translate
 #' @export
 translate_string <- function(
-  expression, speak = TRUE, function_call_end = "of "
+    expression,
+    speak = TRUE,
+    function_call_end = "of "
 ) {
 
   if (!is.character(expression) & length(expression != 1)) {
     stop("The 'expression' argument must be a character string.\n")
   }
+
   if (!is.logical(speak)) {
     stop("The 'speak' argument must be TRUE or FALSE.\n")
   }
+
   if (!is.character(function_call_end) & length(function_call_end != 1)) {
     stop("The 'function_call_end' argument must be a character string.\n")
   }
@@ -42,30 +46,43 @@ translate_string <- function(
 #' translate(variable <- 1)
 #' }
 translate <- function(expression, speak = TRUE, function_call_end = "of ") {
+
   quoted_expression <- substitute(expression)
+
   if (!is.logical(speak)) {
     stop("The 'speak' argument must be TRUE or FALSE.\n")
   }
+
   if (!is.character(function_call_end) & length(function_call_end != 1)) {
     stop("The 'function_call_end' argument must be a character string.\n")
   }
-  return(.convert_quoted_expression(
-    quoted_expression, speak = speak, function_call_end = function_call_end)
+
+  .convert_quoted_expression(
+    quoted_expression,
+    speak = speak,
+    function_call_end = function_call_end
   )
+
 }
 
 .convert_quoted_expression <- function(
-  quoted_expression, speak = TRUE, function_call_end = "of "
+    quoted_expression,
+    speak = TRUE,
+    function_call_end = "of "
 ) {
 
   trees <- .convert_expr_tree(deparse(quoted_expression))
+  trees_nrow <- nrow(trees)
 
-  eng_vec <- purrr::map2_chr(
-    trees$token,
-    trees$text,
-    .translate,
-    function_call_end = function_call_end
-  )
+  eng_vec <- vector("character", length = trees_nrow)
+
+  for (i in seq_len(trees_nrow)) {
+    eng_vec[[i]] <- .translate(
+      token = trees[i, "token"],
+      text = trees[i, "text"],
+      function_call_end = function_call_end
+    )
+  }
 
   eng_expression <- gsub(" +", " ", paste0(eng_vec, collapse = " "))
 
@@ -82,7 +99,7 @@ translate <- function(expression, speak = TRUE, function_call_end = "of ") {
   class(results) <- append(class(results), "r2eng")
 
   if (speak) {
-      speak(results)
+    speak(results)
   }
 
   return(results)
@@ -98,7 +115,7 @@ translate <- function(expression, speak = TRUE, function_call_end = "of ") {
 #' @return Nothing.
 #' @export
 speak <- function(r2eng, ...) {
-    UseMethod("speak", r2eng)
+  UseMethod("speak", r2eng)
 }
 
 #' Evaluate expression in r2eng object
@@ -111,13 +128,13 @@ speak <- function(r2eng, ...) {
 #' @return Nothing.
 #' @export
 evaluate <- function(r2eng, ...) {
-    UseMethod("evaluate", r2eng)
+  UseMethod("evaluate", r2eng)
 }
 
 #' @rdname evaluate
 #' @export
 evaluate.r2eng <- function(r2eng, envir = parent.frame(), ...) {
-    eval(r2eng$quoted_expression, envir = envir)
+  eval(r2eng$quoted_expression, envir = envir)
 }
 
 #' @rdname speak
@@ -140,8 +157,8 @@ speak.r2eng <- function(r2eng, ...) {
 #' @return Nothing.
 #' @export
 print.r2eng <- function(x, ...) {
-    cat(paste0("Original expression: ", x$r_expression, "\n"))
-    cat(paste0("English expression:", x$eng_expression, "\n"))
+  cat(paste0("Original expression: ", x$r_expression, "\n"))
+  cat(paste0("English expression:", x$eng_expression, "\n"))
 }
 
 .convert_expr_tree <- function(expression) {

README.Rmd

@@ -20,26 +20,26 @@ knitr::opts_chunk$set(
 ɑː ˈtuː /eng/
 
 <!-- badges: start -->
-[![Project Status: WIP – Initial development is in progress, but there has not yet been a stable, usable release suitable for the public.](https://www.repostatus.org/badges/latest/wip.svg){target='_blank'}](https://www.repostatus.org/#wip)
-[![R build status](https://github.com/matt-dray/r2eng/workflows/R-CMD-check/badge.svg){target='_blank'}](https://github.com/matt-dray/r2eng/actions)
-[![codecov](https://codecov.io/gh/matt-dray/r2eng/branch/master/graph/badge.svg){target='_blank'}](https://codecov.io/gh/matt-dray/r2eng)
+[![Project Status: WIP – Initial development is in progress, but there has not yet been a stable, usable release suitable for the public.](https://www.repostatus.org/badges/latest/wip.svg)](https://www.repostatus.org/#wip)
+[![R build status](https://github.com/matt-dray/r2eng/workflows/R-CMD-check/badge.svg)](https://github.com/matt-dray/r2eng/actions)
+[![codecov](https://codecov.io/gh/matt-dray/r2eng/branch/master/graph/badge.svg)](https://codecov.io/gh/matt-dray/r2eng)
 [![Launch Rstudio Binder](http://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/matt-dray/try-r2eng/master?urlpath=rstudio)
 <!-- badges: end -->
 
 Make R speakable!
 
 The goal of {r2eng} (as in 'R to English') is to take an R expression and 'translate' it to an English sentence. 
 
-The package is intended to:
+The package is intended (optimistically) to:
 
 * improve communication between teachers and learners
 * make R discussions in English more accessible to non-English speakers
 * provide an extra audio evaluation tool for users who are blind or have low vision
 * be of interest to any R user that's curious about how R expressions might be vocalised
 
-The project was inspired by [Amelia McNamara](https://twitter.com/AmeliaMN){target='_blank'}'s useR! 2020 talk called 'Speaking R' ([YouTube](https://www.youtube.com/watch?v=ckW9sSdIVAc){target='_blank'}, [slides](https://www.amelia.mn/SpeakingR/#1){target='_blank'}).
+The project was inspired by [Amelia McNamara](https://twitter.com/AmeliaMN)'s useR! 2020 talk called 'Speaking R' ([YouTube](https://www.youtube.com/watch?v=ckW9sSdIVAc), [slides](https://www.amelia.mn/SpeakingR/#1)).
 
-This project is a work in progress and highly opinionated. Contributions are welcome, but please see the [Code of Conduct](#conduct){target='_blank'}.
+This project is a work in progress and highly opinionated. Contributions are welcome, but please see the [Code of Conduct](#conduct).
 
 ## Installation
 
@@ -49,14 +49,14 @@ You can install the development version of {r2eng} from GitHub with:
 remotes::install_github("matt-dray/r2eng")
 ```
 
-This package depends on {purrr} and {rlang}.
+This package depends on {rlang}.
 
 ## Examples
 
-The main function in the package is `translate()`. It uses [non-standard evaluation](http://adv-r.had.co.nz/Computing-on-the-language.html){target='_blank'}, so you pass it a bare R expression like this:
+The main function in the package is `translate()`. It uses [non-standard evaluation](http://adv-r.had.co.nz/Computing-on-the-language.html), so you pass it a bare R expression like this:
 
 ```{r example-basic}
-r2eng::translate(variable <- 1, speak = TRUE)
+r2eng::translate(variable <- 1, speak = FALSE)
 ```
 
 Set `speak = TRUE` for a system call that will read the English sentence out loud (macOS only).
@@ -135,7 +135,7 @@ r2eng::translate(
 
 The `translate()` function understands the meaning of `=` when used for assignment versus specifying arguments, but feeding an expression such as `x = c(1, 2, 3)` would confuse `translate()` that you want to pass an argument `c(1, 2, 3)` to the parameter `x`. 
 
-This is because `translate()` uses [non-standard evaluation](http://adv-r.had.co.nz/Computing-on-the-language.html){target='_blank'}. 
+This is because `translate()` uses [non-standard evaluation](http://adv-r.had.co.nz/Computing-on-the-language.html). 
 
 In such cases, you must use `translate_string()` instead:
 
@@ -152,7 +152,7 @@ Another exceptional case for `translate_string()` is when piping and expression:
 
 ## RStudio addin
 
-Installing this package also installs an [RStudio addin](https://rstudio.github.io/rstudioaddins/){target='_blank'}.
+Installing this package also installs an [RStudio addin](https://rstudio.github.io/rstudioaddins/).
 
 Select an R expression in the editor and then under 'Addins', go to 'Speak R Expression In English' under 'R2ENG'. The selected text will be spoken by your computer. 
 
@@ -164,6 +164,6 @@ Another Addin function is also available, 'Print R Expression In English', which
 
 ## Contributions and Code of Conduct {#conduct}
 
-Contributions are welcome from everyone. Please first [add an issue](https://github.com/matt-dray/r2eng/issues){target='_blank'} if a relevant one one doesn't already exist.
+Contributions are welcome from everyone. Please first [add an issue](https://github.com/matt-dray/r2eng/issues) if a relevant one one doesn't already exist.
 
-Please note that the {r2eng} project is released with a [Contributor Code of Conduct](https://contributor-covenant.org/version/2/0/CODE_OF_CONDUCT.html){target='_blank'}. By contributing to this project, you agree to abide by its terms.
+Please note that the {r2eng} project is released with a [Contributor Code of Conduct](https://contributor-covenant.org/version/2/0/CODE_OF_CONDUCT.html). By contributing to this project, you agree to abide by its terms.

README.md

@@ -27,7 +27,7 @@ Make R speakable!
 The goal of {r2eng} (as in ‘R to English’) is to take an R expression
 and ‘translate’ it to an English sentence.
 
-The package is intended to:
+The package is intended (optimistically) to:
 
 - improve communication between teachers and learners
 - make R discussions in English more accessible to non-English speakers
@@ -55,7 +55,7 @@ You can install the development version of {r2eng} from GitHub with:
 remotes::install_github("matt-dray/r2eng")
 ```
 
-This package depends on {purrr} and {rlang}.
+This package depends on {rlang}.
 
 ## Examples
 
@@ -65,7 +65,7 @@ target="_blank">non-standard evaluation</a>, so you pass it a bare R
 expression like this:
 
 ``` r
-r2eng::translate(variable <- 1, speak = TRUE)
+r2eng::translate(variable <- 1, speak = FALSE)
 # Original expression: variable <- 1
 # English expression: variable gets 1
 ```