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add reader option for parsing [] as ().

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* libguile/private-options.h:
* libguile/read.c (scm_read_opts, SCM_SQUARE_BRACKETS_P): Add an option
  for treating [ and ] as parentheses, on by default. Note that this
  makes them delimiters also, so [ and ] cannot appear in a symbol name,
  with this read option on.
  (scm_read_sexp): If we start with [, we end with ].
  (scm_read_expression): Add case for [.
This commit is contained in:
Andy Wingo 2010-01-15 22:24:31 +01:00
parent e1138ba199
commit 5afa815c9c
2 changed files with 11 additions and 3 deletions
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3
libguile/private-options.h
View file

@ -4,7 +4,7 @@
* We put this in a private header, since layout of data structures
* is an implementation detail that we want to hide.
*
* Copyright (C) 2007, 2009 Free Software Foundation, Inc.
* Copyright (C) 2007, 2009, 2010 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
@ -96,6 +96,7 @@ SCM_API scm_t_option scm_read_opts[];
#define SCM_ESCAPED_PARENS_P scm_read_opts[5].val
#endif
#define SCM_R6RS_ESCAPES_P scm_read_opts[6].val
#define SCM_SQUARE_BRACKETS_P scm_read_opts[7].val
#if SCM_ENABLE_ELISP
#define SCM_N_READ_OPTIONS 7

11
libguile/read.c
View file

@ -78,6 +78,8 @@ scm_t_option scm_read_opts[] = {
#endif
{ SCM_OPTION_BOOLEAN, "r6rs-hex-escapes", 0,
"Use R6RS variable-length character and string hex escapes."},
{ SCM_OPTION_BOOLEAN, "square-brackets", 1,
"Treat `[' and `]' as parentheses, for R6RS compatibility."},
{ 0, },
};
@ -173,7 +175,8 @@ static SCM *scm_read_hash_procedures;
structure''). */
#define CHAR_IS_R5RS_DELIMITER(c) \
(CHAR_IS_BLANK (c) \
|| (c == ')') || (c == '(') || (c == ';') || (c == '"'))
|| (c == ')') || (c == '(') || (c == ';') || (c == '"') \
|| (SCM_SQUARE_BRACKETS_P && ((c == '[') || (c == ']'))))
#define CHAR_IS_DELIMITER CHAR_IS_R5RS_DELIMITER
@ -332,7 +335,7 @@ scm_read_sexp (scm_t_wchar chr, SCM port)
register SCM tmp;
register SCM tl, ans = SCM_EOL;
SCM tl2 = SCM_EOL, ans2 = SCM_EOL, copy = SCM_BOOL_F;
static const int terminating_char = ')';
const int terminating_char = ((chr == '[') ? ']' : ')');
/* Need to capture line and column numbers here. */
long line = SCM_LINUM (port);
@ -1251,6 +1254,10 @@ scm_read_expression (SCM port)
case ';':
(void) scm_read_semicolon_comment (chr, port);
break;
case '[':
if (!SCM_SQUARE_BRACKETS_P)
return (scm_read_mixed_case_symbol (chr, port));
/* otherwise fall through */
case '(':
return (scm_read_sexp (chr, port));
case '"':