builtin: Implement builtin_ascii

Implement builtin ascii

Author: corona10

builtin/builtin.go

@@ -6,6 +6,9 @@
 package builtin
 
 import (
+"strconv"
+"strings"
+"unicode"
 "unicode/utf8"
 
 "github.com/go-python/gpython/compile"
@@ -24,7 +27,7 @@ func init(){
 py.MustNewMethod("abs", builtin_abs, 0, abs_doc),
 py.MustNewMethod("all", builtin_all, 0, all_doc),
 py.MustNewMethod("any", builtin_any, 0, any_doc),
-// py.MustNewMethod("ascii", builtin_ascii, 0, ascii_doc),
+py.MustNewMethod("ascii", builtin_ascii, 0, ascii_doc),
 // py.MustNewMethod("bin", builtin_bin, 0, bin_doc),
 // py.MustNewMethod("callable", builtin_callable, 0, callable_doc),
 py.MustNewMethod("chr", builtin_chr, 0, chr_doc),
@@ -309,6 +312,36 @@ func builtin_any(self, seq py.Object) (py.Object, error){
 returnpy.False, nil
 }
 
+constascii_doc=`ascii(obj, /)
+Return an ASCII-only representation of an object.
+
+As repr(), return a string containing a printable representation of an
+object, but escape the non-ASCII characters in the string returned by
+repr() using \\x, \\u or \\U escapes. This generates a string similar
+to that returned by repr() in Python 2
+`
+
+funcbuiltin_ascii(self, o py.Object) (py.Object, error){
+reprObject, err:=py.Repr(o)
+iferr!=nil{
+returnnil, err
+ }
+
+varsb strings.Builder
+repr:=reprObject.(py.String)
+for_, c:=rangerepr{
+ifc<=unicode.MaxASCII{
+sb.WriteRune(c)
+ } else{
+s:="\\u"+strconv.FormatInt(int64(c), 16)
+sb.WriteString(s)
+ }
+ }
+
+ascii:=sb.String()
+returnpy.String(ascii), nil
+}
+
 constround_doc=`round(number[, ndigits]) -> number
 
 Round a number to a given precision in decimal digits (default 0 digits).

builtin/tests/builtin.py

@@ -19,6 +19,10 @@
 assertany(["hello", "world"]) ==True
 assertany([]) ==False
 
+doc="ascii"
+assertascii('hello world') =="'hello world'"
+assertascii('안녕 세상') =="'\\uc548\\ub155 \\uc138\\uc0c1'"
+
 doc="chr"
 assertchr(65) =="A"
 assertchr(163) =="£"