Ruby: step0, step1

1 files changed, 32 insertions, 0 deletions

diff --git a/ruby/step1_read_print.rb b/ruby/step1_read_print.rb
new file mode 100644
index 0000000..20dd450
--- /dev/null
+++ b/ruby/step1_read_print.rb
@@ -0,0 +1,32 @@
+require "readline"
+require "types"
+require "reader"
+require "printer"
+
+# read
+def READ(str)
+    return read_str(str)
+end
+
+# eval
+def EVAL(ast, env)
+    return ast
+end
+
+# print
+def PRINT(exp)
+    return _pr_str(exp, true)
+end
+
+# repl
+def REP(str)
+    return PRINT(EVAL(READ(str), {}))
+end
+
+while line = Readline.readline("user> ", true)
+    begin
+        puts REP(line)
+    rescue Exception => e
+        puts "Error: %{e}" 
+    end
+end