Remove lintr dependency

DESCRIPTION

@@ -1,5 +1,5 @@
 Package: r2eng
-Version: 0.0.0.9005
+Version: 0.0.0.9006
 Type: Package
 Title: Translate R Code To An English Sentence
 Description: Take an R expression and convert it to English by matching
@@ -13,12 +13,11 @@ URL: https://github.com/matt-dray/r2eng/
 BugReports: https://github.com/matt-dray/r2eng/issues
 Encoding: UTF-8
 LazyData: true
-RoxygenNote: 7.1.1
+RoxygenNote: 7.2.3
 Language: en-GB
 Depends: 
     R (>= 2.10)
 Imports:
-    lintr (>= 2.0.1),
     purrr (>= 0.3.4),
     rlang (>= 0.4.7),
     utils

NEWS.md

@@ -1,3 +1,7 @@
+# r2eng 0.0.0.9006
+
+* Removed {lintr} dependency.
+
 # r2eng 0.0.0.9005
 
 * BREAKING:

R/translate.R

@@ -145,11 +145,9 @@ print.r2eng <- function(x, ...) {
 }
 
 .convert_expr_tree <- function(expression) {
-    tmp <- tempfile()
-    writeLines(expression, tmp)
-    trees <- lintr::get_source_expressions(tmp)
-    unlink(tmp)
-    return(trees$expressions[[1]]$parsed_content[,c("token", "text")])
+  parsed <- parse(text = expression, keep.source = TRUE)
+  parse_data <- utils::getParseData(parsed)
+  parse_data[, c("token", "text")]
 }