diff options
Diffstat (limited to 'libguile/read.c')
-rw-r--r-- | libguile/read.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/libguile/read.c b/libguile/read.c index ee8786133..c54fbb62d 100644 --- a/libguile/read.c +++ b/libguile/read.c @@ -60,6 +60,7 @@ SCM_GLOBAL_SYMBOL (scm_sym_dot, "."); SCM_SYMBOL (scm_keyword_prefix, "prefix"); SCM_SYMBOL (scm_keyword_postfix, "postfix"); +SCM_SYMBOL (sym_nil, "nil"); scm_t_option scm_read_opts[] = { { SCM_OPTION_BOOLEAN, "copy", 0, @@ -847,6 +848,19 @@ scm_read_syntax (int chr, SCM port) } static inline SCM +scm_read_nil (int chr, SCM port) +{ + SCM id = scm_read_mixed_case_symbol (chr, port); + + if (!scm_is_eq (id, sym_nil)) + scm_i_input_error ("scm_read_nil", port, + "unexpected input while reading #nil: ~a", + scm_list_1 (id)); + + return SCM_ELISP_NIL; +} + +static inline SCM scm_read_semicolon_comment (int chr, SCM port) { int c; @@ -1316,6 +1330,8 @@ scm_read_sharp (scm_t_wchar chr, SCM port) case '\'': case ',': return (scm_read_syntax (chr, port)); + case 'n': + return (scm_read_nil (chr, port)); default: result = scm_read_sharp_extension (chr, port); if (scm_is_eq (result, SCM_UNSPECIFIED)) |