R: add step6_file and step7_quote

Change symbols to be special class.

1 files changed, 23 insertions, 1 deletions

diff --git a/r/core.r b/r/core.r
index a59dfb6..47800ac 100644
--- a/r/core.r
+++ b/r/core.r
@@ -4,6 +4,8 @@ if(!exists("..types..")) source("types.r")
 if(!exists("..printer..")) source("printer.r")
 
 
+# String functions
+
 pr_str <- function(...) .pr_list(..., print_readably=TRUE, join=" ")
 
 str <- function(...) .pr_list(..., print_readably=FALSE, join="")
@@ -18,6 +20,22 @@ println <- function(...) {
     nil
 }
 
+# Sequence functions
+cons <- function(a,b) {
+    new_lst <- append(list(a), b)
+    class(new_lst) <- "List"
+    new_lst
+}
+
+do_concat <- function(...) {
+    new_lst <- list()
+    for(l in list(...)) {
+        new_lst <- append(new_lst, l)
+    }
+    class(new_lst) <- "List"
+    new_lst
+}
+
 core_ns <- list(
     "="=function(a,b) .equal_q(a,b),
 
@@ -25,6 +43,8 @@ core_ns <- list(
     "str"=str,
     "prn"=prn,
     "println"=println,
+    "read-string"=function(str) read_str(str),
+    "slurp"=function(path) readChar(path, file.info(path)$size),
     "<"=function(a,b) a<b,
     "<="=function(a,b) a<=b,
     ">"=function(a,b) a>b,
@@ -37,6 +57,8 @@ core_ns <- list(
     "list"=function(...) new.list(...),
     "list?"=function(a) .list_q(a),
     "empty?"=function(a) .sequential_q(a) && length(a) == 0,
-    "count"=function(a) length(a)
+    "count"=function(a) length(a),
 
+    "cons"=cons,
+    "concat"=do_concat
 )