use eval.expr = TRUE to enable evaluating R expressions (cf rstudio/r…

…markdown#1387)
chuxinyuan · Jun 28, 2018 · 9d931d4 · 9d931d4
1 parent 2b3e617
commit 9d931d4
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diff --git a/DESCRIPTION b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: knitr
 Type: Package
 Title: A General-Purpose Package for Dynamic Report Generation in R
-Version: 1.20.6
+Version: 1.20.7
 Authors@R: c(
     person("Yihui", "Xie", role = c("aut", "cre"), email = "[email protected]", comment = c(ORCID = "0000-0003-0645-5666")),
     person("Adam", "Vogt", role = "ctb"),
@@ -103,7 +103,7 @@ Imports:
     highr,
     markdown,
     stringr (>= 0.6),
-    yaml,
+    yaml (>= 2.1.19),
     methods,
     tools
 Suggests:

diff --git a/R/params.R b/R/params.R
@@ -103,7 +103,9 @@ knit_params = function(text, evaluate = TRUE) {
 #' @export
 knit_params_yaml = function(yaml, evaluate = TRUE) {
   # parse the yaml using our handlers
-  parsed_yaml = yaml::yaml.load(yaml, handlers = knit_params_handlers(evaluate = evaluate))
+  parsed_yaml = yaml::yaml.load(
+    yaml, handlers = knit_params_handlers(evaluate = evaluate), eval.expr = TRUE
+  )
 
   # if we found paramters then resolve and return them
   if (is.list(parsed_yaml) && !is.null(parsed_yaml$params)) {