catch errors during printing of frame locals

[swankr.git] / swank.R

diff --git a/swank.R b/swank.R
index b5c79c78204695667f421bbceb3b3e83664971c1..0b48ed34e1dd29f2e0f5a96bb98594fdeb227db6 100644 (file)
--- a/swank.R
+++ b/swank.R
@@ -425,19 +425,27 @@ computeRestartsForEmacs <- function (sldbState) {
   objs <- ls(envir=frame)
   list(lapply(objs, function(name) { list(quote(`:name`), name,
                                           quote(`:id`), 0,
-                                          quote(`:value`), printToString(eval(parse(text=name), envir=frame))) }),
+                                          quote(`:value`),
+                                          tryCatch({
+                                            printToString(eval(parse(text=name), envir=frame))
+                                          }, error=function(c) {
+                                            sprintf("error printing object")
+                                          }))}),
        list())
 }
 
 `swank:simple-completions` <- function(slimeConnection, sldbState, prefix, package) {
-  ## fails multiply if prefix contains regexp metacharacters
-  matches <- apropos(sprintf("^%s", prefix), ignore.case=FALSE)
+  literal2rx <- function(string) {
+    ## list of ERE metacharacters from ?regexp
+    gsub("([.\\|()[{^$*+?])", "\\\\\\1", string)
+  }
+  matches <- apropos(sprintf("^%s", literal2rx(prefix)), ignore.case=FALSE)
   nmatches <- length(matches)
   if(nmatches == 0) {
     list(list(), "")
   } else {
     longest <- matches[order(nchar(matches))][1]
-    while(length(grep(sprintf("^%s", longest), matches)) < nmatches) {
+    while(length(grep(sprintf("^%s", literal2rx(longest)), matches)) < nmatches) {
       longest <- substr(longest, 1, nchar(longest)-1)
     }
     list(as.list(matches), longest)