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[PATCH] Implement per-port reader options and #!fold-case
|
From: |
Mark H Weaver |
|
Subject: |
[PATCH] Implement per-port reader options and #!fold-case |
|
Date: |
Sun, 14 Oct 2012 05:07:51 -0400 |
Hello all,
Here's a patch set to implement per-port reader options in 2.0. It also
implements the "#!fold-case" and "#!no-fold-case" reader directives from
the R7RS draft.
The first two patches are cleanups for minor problems I noticed while
working on the last patch, which is the interesting one.
Comments and suggestions solicited.
Mark
>From 005465769504c4173f3469d7d3958bb0945d1e3b Mon Sep 17 00:00:00 2001
From: Mark H Weaver <address@hidden>
Date: Sat, 13 Oct 2012 20:28:27 -0400
Subject: [PATCH 1/3] Improve formatting of options help given long option
names
* module/ice-9/boot-9.scm (define-option-interface): When printing
options help, e.g. for (read-options 'help), expand the width of the
first column by another tab stop, to accommodate option names of up to
23 characters.
---
module/ice-9/boot-9.scm | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/module/ice-9/boot-9.scm b/module/ice-9/boot-9.scm
index cf8252a..d679f6e 100644
--- a/module/ice-9/boot-9.scm
+++ b/module/ice-9/boot-9.scm
@@ -2850,8 +2850,11 @@ module '(ice-9 q) '(make-q q-length))}."
(lambda (option)
(apply (lambda (name value documentation)
(display name)
- (if (< (string-length (symbol->string name)) 8)
- (display #\tab))
+ (let ((len (string-length (symbol->string name))))
+ (when (< len 16)
+ (display #\tab)
+ (when (< len 8)
+ (display #\tab))))
(display #\tab)
(display value)
(display #\tab)
--
1.7.10.4
>From f7c40bfde4e27c6ae1cc0bc346aff07907b54f1d Mon Sep 17 00:00:00 2001
From: Mark H Weaver <address@hidden>
Date: Sat, 13 Oct 2012 20:41:45 -0400
Subject: [PATCH 2/3] Remove prototype for scm_read_token, which does not
exist.
* libguile/read.h: Remove prototype for scm_read_token.
---
libguile/read.h | 1 -
1 file changed, 1 deletion(-)
diff --git a/libguile/read.h b/libguile/read.h
index 4bd08fa..3c47afd 100644
--- a/libguile/read.h
+++ b/libguile/read.h
@@ -54,7 +54,6 @@ SCM_API SCM scm_sym_dot;
SCM_API SCM scm_read_options (SCM setting);
SCM_API SCM scm_read (SCM port);
-SCM_API size_t scm_read_token (int ic, SCM * tok_buf, SCM port, int weird);
SCM_API SCM scm_read_hash_extend (SCM chr, SCM proc);
SCM_INTERNAL char *scm_i_scan_for_encoding (SCM port);
SCM_API SCM scm_file_encoding (SCM port);
--
1.7.10.4
>From a771be5c83a97ea728ba34e19114c966164e4dc2 Mon Sep 17 00:00:00 2001
From: Mark H Weaver <address@hidden>
Date: Sat, 13 Oct 2012 23:02:05 -0400
Subject: [PATCH 3/3] Implement per-port reader options, #!fold-case and
#!no-fold-case.
* libguile/ports.c (scm_new_port_table_entry): Change initial values
in 'scm_i_port_weak_hash' from SCM_BOOL_F to SCM_EOL, for use as
an alist, where per-port reader options can be stored.
* libguile/read.c (scm_t_read_opts): New internal C struct type.
(set_per_port_read_option, set_per_port_case_insensitive_p,
init_read_options): New internal static functions.
(CHAR_IS_R5RS_DELIMITER, CHAR_IS_DELIMITER): Move the '[' and ']'
delimiters from CHAR_IS_R5RS_DELIMITER to CHAR_IS_DELIMITER. Consult
'opts' (assumed to be a local variable) to determine whether square
brackets are delimiters.
(scm_read): Call 'init_read_options' to initialize a local struct of
type 'scm_t_read_opts'. A pointer to this struct is passed down to
all reader helper functions that need it.
(flush_ws, maybe_annotate_source, read_complete_token, read_token,
scm_read_array, scm_read_bytevector, scm_read_character,
scm_read_commented_expression, scm_read_expression,
scm_read_guile_bit_vector, scm_read_keyword,
scm_read_mixed_case_symbol, scm_read_nil, scm_read_number,
scm_read_number_and_radix, scm_read_quote, scm_read_sexp,
scm_read_sharp, scm_read_sharp_extension, scm_read_shebang,
scm_read_srfi4_vector, scm_read_string, scm_read_syntax,
scm_read_vector): Add 'opts' as an additional parameter, and use it to
look up read options. Previously the global read options were
consulted directly.
* doc/ref/api-evaluation.texi (Case Sensitivity, Scheme Read): Mention
the existence of per-port reader options, and the reader directives
#!fold-case and #!no-fold-case.
* test-suite/tests/reader.test ("per-port-read-options"): Add tests.
---
doc/ref/api-evaluation.texi | 23 ++-
libguile/ports.c | 5 +-
libguile/read.c | 422 +++++++++++++++++++++++++++++-------------
test-suite/tests/reader.test | 13 ++
4 files changed, 323 insertions(+), 140 deletions(-)
diff --git a/doc/ref/api-evaluation.texi b/doc/ref/api-evaluation.texi
index 6112832..9eccb39 100644
--- a/doc/ref/api-evaluation.texi
+++ b/doc/ref/api-evaluation.texi
@@ -254,6 +254,8 @@ Encoding of Source Files}.
@node Case Sensitivity
@subsubsection Case Sensitivity
address@hidden fold-case
address@hidden no-fold-case
@c FIXME::martin: Review me!
@@ -275,9 +277,9 @@ options, @xref{Scheme Read}.
(read-enable 'case-insensitive)
@end lisp
-Note that this is seldom a problem, because Scheme programmers tend not
-to use uppercase letters in their identifiers anyway.
-
+It is also possible to disable (or enable) case sensitivity within a
+single file by placing the reader directives @code{#!fold-case} (or
address@hidden) within the file itself.
@node Keyword Syntax
@subsubsection Keyword Syntax
@@ -315,10 +317,10 @@ its read options.
@cindex options - read
@cindex read options
@deffn {Scheme Procedure} read-options [setting]
-Display the current settings of the read options. If @var{setting} is
-omitted, only a short form of the current read options is printed.
-Otherwise if @var{setting} is the symbol @code{help}, a complete options
-description is displayed.
+Display the current settings of the global read options. If
address@hidden is omitted, only a short form of the current read options
+is printed. Otherwise if @var{setting} is the symbol @code{help}, a
+complete options description is displayed.
@end deffn
The set of available options, and their default values, may be had by
@@ -338,6 +340,13 @@ hungry-eol-escapes no In strings, consume leading
whitespace after an
escaped end-of-line.
@end smalllisp
+Note that Guile also includes a preliminary mechanism for overriding
+read options on a per-port basis. Currently, the only read option that
+is overridden in this way is the @code{case-insensitive} option, which
+is set or unset when the reader encounters the special directives
address@hidden or @code{#!no-fold-case}. There is currently no
+other way to access or set these per-port read options.
+
The boolean options may be toggled with @code{read-enable} and
@code{read-disable}. The non-boolean @code{keywords} option must be set
using @code{read-set!}.
diff --git a/libguile/ports.c b/libguile/ports.c
index 301bc44..b16a463 100644
--- a/libguile/ports.c
+++ b/libguile/ports.c
@@ -533,7 +533,8 @@ scm_i_dynwind_current_load_port (SCM port)
/*
We need a global registry of ports to flush them all at exit, and to
- get all the ports matching a file descriptor.
+ get all the ports matching a file descriptor. The associated values
+ are alists, currently used only for per-port reader options.
*/
SCM scm_i_port_weak_hash;
@@ -633,7 +634,7 @@ scm_new_port_table_entry (scm_t_bits tag)
SCM_SET_CELL_TYPE (z, tag);
SCM_SETPTAB_ENTRY (z, entry);
- scm_hashq_set_x (scm_i_port_weak_hash, z, SCM_BOOL_F);
+ scm_hashq_set_x (scm_i_port_weak_hash, z, SCM_EOL);
/* For each new port, register a finalizer so that it port type's free
function can be invoked eventually. */
diff --git a/libguile/read.c b/libguile/read.c
index 87d73bf..da51a05 100644
--- a/libguile/read.c
+++ b/libguile/read.c
@@ -82,6 +82,144 @@ scm_t_option scm_read_opts[] = {
};
/*
+ * Internal read options structure. This is initialized by 'scm_read'
+ * from the global and per-port read options, and a pointer is passed
+ * down to all helper functions.
+ */
+typedef struct {
+ enum { KEYWORD_STYLE_HASH_PREFIX,
+ KEYWORD_STYLE_PREFIX,
+ KEYWORD_STYLE_POSTFIX } keyword_style;
+ char copy_source_p;
+ char record_positions_p;
+ char case_insensitive_p;
+ char r6rs_escapes_p;
+ char square_brackets_p;
+ char hungry_eol_escapes_p;
+} scm_t_read_opts;
+
+/*
+ * Per-port read option overrides.
+ *
+ * In order to implement the reader directives "#!fold-case" and
+ * "#!no-fold-case" properly, we need to set the 'case-insensitive' read
+ * option on a per-port basis. We also anticipate a need to set other
+ * read options on a per-port basis as well.
+ *
+ * We store per-port read option overrides in the
+ * '%read-option-overrides%' key of the port's alist, which is stored in
+ * 'scm_i_port_weak_hash'. The value stored in the alist is a single
+ * integer that contains a two-bit field for each read option.
+ *
+ * If a bit field contains OVERRIDE_DEFAULT (3), that indicates that the
+ * corresponding read option has not been overridden for this port, so
+ * the global read option should be used. Otherwise, the bit field
+ * contains the value of the read option. For boolean read options that
+ * have been overridden, the other possible values are 0 or 1. If the
+ * 'keyword_style' read option is overridden, its possible values are
+ * taken from the enum of the 'scm_t_read_opts' struct.
+ */
+
+SCM_SYMBOL (sym_read_option_overrides, "%read-option-overrides%");
+
+#define OVERRIDE_SHIFT_COPY_SOURCE_P 0
+#define OVERRIDE_SHIFT_RECORD_POSITIONS_P 2
+#define OVERRIDE_SHIFT_CASE_INSENSITIVE_P 4
+#define OVERRIDE_SHIFT_KEYWORD_STYLE 6
+#define OVERRIDE_SHIFT_R6RS_ESCAPES_P 8
+#define OVERRIDE_SHIFT_SQUARE_BRACKETS_P 10
+#define OVERRIDE_SHIFT_HUNGRY_EOL_ESCAPES_P 12
+#define OVERRIDES_SHIFT_END 14
+
+#define OVERRIDES_ALL_DEFAULTS ((1UL << OVERRIDES_SHIFT_END) - 1)
+#define OVERRIDES_MAX_VALUE OVERRIDES_ALL_DEFAULTS
+
+#define OVERRIDE_MASK 3
+#define OVERRIDE_DEFAULT 3
+
+static void
+set_per_port_read_option (SCM port, int shift, int value)
+{
+ SCM alist, scm_overrides;
+ int overrides;
+
+ value &= OVERRIDE_MASK;
+ scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex);
+ alist = scm_hashq_ref (scm_i_port_weak_hash, port, SCM_BOOL_F);
+ scm_overrides = scm_assq_ref (alist, sym_read_option_overrides);
+ if (scm_is_unsigned_integer (scm_overrides, 0, OVERRIDES_MAX_VALUE))
+ overrides = scm_to_int (scm_overrides);
+ else
+ overrides = OVERRIDES_ALL_DEFAULTS;
+ overrides &= ~(OVERRIDE_MASK << shift);
+ overrides |= value << shift;
+ scm_overrides = scm_from_int (overrides);
+ alist = scm_assq_set_x (alist, sym_read_option_overrides, scm_overrides);
+ scm_hashq_set_x (scm_i_port_weak_hash, port, alist);
+ scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex);
+}
+
+/* Set case-insensitivity on a per-port basis. */
+static void
+set_per_port_case_insensitive_p (SCM port, scm_t_read_opts *opts, int value)
+{
+ value = !!value;
+ opts->case_insensitive_p = value;
+ set_per_port_read_option (port, OVERRIDE_SHIFT_CASE_INSENSITIVE_P, value);
+}
+
+/* Initialize the internal read options structure from the global and
+ per-port read options. */
+static void
+init_read_options (SCM port, scm_t_read_opts *opts)
+{
+ SCM alist, val, scm_overrides;
+ int overrides;
+ int x;
+
+ scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex);
+ alist = scm_hashq_ref (scm_i_port_weak_hash, port, SCM_BOOL_F);
+ scm_overrides = scm_assq_ref (alist, sym_read_option_overrides);
+ scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex);
+
+ if (scm_is_unsigned_integer (scm_overrides, 0, OVERRIDES_MAX_VALUE))
+ overrides = scm_to_int (scm_overrides);
+ else
+ overrides = OVERRIDES_ALL_DEFAULTS;
+
+ x = OVERRIDE_MASK & (overrides >> OVERRIDE_SHIFT_KEYWORD_STYLE);
+ if (x == OVERRIDE_DEFAULT)
+ {
+ val = SCM_PACK (SCM_KEYWORD_STYLE);
+ if (scm_is_eq (val, scm_keyword_prefix))
+ x = KEYWORD_STYLE_PREFIX;
+ else if (scm_is_eq (val, scm_keyword_postfix))
+ x = KEYWORD_STYLE_POSTFIX;
+ else
+ x = KEYWORD_STYLE_HASH_PREFIX;
+ }
+ opts->keyword_style = x;
+
+#define RESOLVE_BOOLEAN_OPTION(NAME, name) \
+ do { \
+ x = OVERRIDE_MASK & (overrides >> OVERRIDE_SHIFT_ ## NAME); \
+ if (x == OVERRIDE_DEFAULT) \
+ x = !!SCM_ ## NAME; \
+ opts->name = x; \
+ } while (0)
+
+ RESOLVE_BOOLEAN_OPTION(COPY_SOURCE_P, copy_source_p);
+ RESOLVE_BOOLEAN_OPTION(RECORD_POSITIONS_P, record_positions_p);
+ RESOLVE_BOOLEAN_OPTION(CASE_INSENSITIVE_P, case_insensitive_p);
+ RESOLVE_BOOLEAN_OPTION(R6RS_ESCAPES_P, r6rs_escapes_p);
+ RESOLVE_BOOLEAN_OPTION(SQUARE_BRACKETS_P, square_brackets_p);
+ RESOLVE_BOOLEAN_OPTION(HUNGRY_EOL_ESCAPES_P, hungry_eol_escapes_p);
+
+#undef RESOLVE_BOOLEAN_OPTION
+}
+
+
+/*
Give meaningful error messages for errors
We use the format
@@ -167,6 +305,9 @@ scm_i_read_hash_procedures_set_x (SCM value)
/* The maximum size of Scheme character names. */
#define READER_CHAR_NAME_MAX_SIZE 50
+/* The maximum size of reader directive names. */
+#define READER_DIRECTIVE_NAME_MAX_SIZE 15
+
/* `isblank' is only in C99. */
#define CHAR_IS_BLANK_(_chr) \
@@ -185,10 +326,11 @@ scm_i_read_hash_procedures_set_x (SCM value)
structure''). */
#define CHAR_IS_R5RS_DELIMITER(c) \
(CHAR_IS_BLANK (c) \
- || (c == ')') || (c == '(') || (c == ';') || (c == '"') \
- || (SCM_SQUARE_BRACKETS_P && ((c == '[') || (c == ']'))))
+ || (c) == ')' || (c) == '(' || (c) == ';' || (c) == '"')
-#define CHAR_IS_DELIMITER CHAR_IS_R5RS_DELIMITER
+#define CHAR_IS_DELIMITER(c) \
+ (CHAR_IS_R5RS_DELIMITER (c) \
+ || (opts->square_brackets_p && ((c) == ']' || (c) == '[')))
/* Exponent markers, as defined in section 7.1.1 of R5RS, ``Lexical
Structure''. */
@@ -199,8 +341,8 @@ scm_i_read_hash_procedures_set_x (SCM value)
/* Read an SCSH block comment. */
static SCM scm_read_scsh_block_comment (scm_t_wchar, SCM);
static SCM scm_read_r6rs_block_comment (scm_t_wchar, SCM);
-static SCM scm_read_commented_expression (scm_t_wchar, SCM);
-static SCM scm_read_shebang (scm_t_wchar, SCM);
+static SCM scm_read_commented_expression (scm_t_wchar, SCM, scm_t_read_opts *);
+static SCM scm_read_shebang (scm_t_wchar, SCM, scm_t_read_opts *);
static SCM scm_get_hash_procedure (int);
/* Read from PORT until a delimiter (e.g., a whitespace) is read. Put the
@@ -208,7 +350,8 @@ static SCM scm_get_hash_procedure (int);
fewer than BUF_SIZE bytes, non-zero otherwise. READ will be set the number
of
bytes actually read. */
static int
-read_token (SCM port, char *buf, size_t buf_size, size_t *read)
+read_token (SCM port, scm_t_read_opts *opts,
+ char *buf, size_t buf_size, size_t *read)
{
*read = 0;
@@ -238,8 +381,8 @@ read_token (SCM port, char *buf, size_t buf_size, size_t
*read)
/* Like `read_token', but return either BUFFER, or a GC-allocated buffer
if the token doesn't fit in BUFFER_SIZE bytes. */
static char *
-read_complete_token (SCM port, char *buffer, size_t buffer_size,
- size_t *read)
+read_complete_token (SCM port, scm_t_read_opts *opts,
+ char *buffer, size_t buffer_size, size_t *read)
{
int overflow = 0;
size_t bytes_read, overflow_size = 0;
@@ -247,7 +390,7 @@ read_complete_token (SCM port, char *buffer, size_t
buffer_size,
do
{
- overflow = read_token (port, buffer, buffer_size, &bytes_read);
+ overflow = read_token (port, opts, buffer, buffer_size, &bytes_read);
if (bytes_read == 0)
break;
if (overflow || overflow_size != 0)
@@ -284,7 +427,7 @@ read_complete_token (SCM port, char *buffer, size_t
buffer_size,
/* Skip whitespace from PORT and return the first non-whitespace character
read. Raise an error on end-of-file. */
static int
-flush_ws (SCM port, const char *eoferr)
+flush_ws (SCM port, scm_t_read_opts *opts, const char *eoferr)
{
scm_t_wchar c;
while (1)
@@ -321,10 +464,10 @@ flush_ws (SCM port, const char *eoferr)
eoferr = "read_sharp";
goto goteof;
case '!':
- scm_read_shebang (c, port);
+ scm_read_shebang (c, port, opts);
break;
case ';':
- scm_read_commented_expression (c, port);
+ scm_read_commented_expression (c, port, opts);
break;
case '|':
if (scm_is_false (scm_get_hash_procedure (c)))
@@ -355,20 +498,22 @@ flush_ws (SCM port, const char *eoferr)
/* Token readers. */
-static SCM scm_read_expression (SCM port);
-static SCM scm_read_sharp (int chr, SCM port, long line, int column);
+static SCM scm_read_expression (SCM port, scm_t_read_opts *opts);
+static SCM scm_read_sharp (int chr, SCM port, scm_t_read_opts *opts,
+ long line, int column);
static SCM
-maybe_annotate_source (SCM x, SCM port, long line, int column)
+maybe_annotate_source (SCM x, SCM port, scm_t_read_opts *opts,
+ long line, int column)
{
- if (SCM_RECORD_POSITIONS_P)
+ if (opts->record_positions_p)
scm_i_set_source_properties_x (x, line, column, SCM_FILENAME (port));
return x;
}
static SCM
-scm_read_sexp (scm_t_wchar chr, SCM port)
+scm_read_sexp (scm_t_wchar chr, SCM port, scm_t_read_opts *opts)
#define FUNC_NAME "scm_i_lreadparen"
{
int c;
@@ -379,20 +524,20 @@ scm_read_sexp (scm_t_wchar chr, SCM port)
long line = SCM_LINUM (port);
int column = SCM_COL (port) - 1;
- c = flush_ws (port, FUNC_NAME);
+ c = flush_ws (port, opts, FUNC_NAME);
if (terminating_char == c)
return SCM_EOL;
scm_ungetc (c, port);
- tmp = scm_read_expression (port);
+ tmp = scm_read_expression (port, opts);
/* Note that it is possible for scm_read_expression to return
scm_sym_dot, but not as part of a dotted pair: as in #{.}#. So
check that it's a real dot by checking `c'. */
if (c == '.' && scm_is_eq (scm_sym_dot, tmp))
{
- ans = scm_read_expression (port);
- if (terminating_char != (c = flush_ws (port, FUNC_NAME)))
+ ans = scm_read_expression (port, opts);
+ if (terminating_char != (c = flush_ws (port, opts, FUNC_NAME)))
scm_i_input_error (FUNC_NAME, port, "missing close paren",
SCM_EOL);
return ans;
@@ -401,24 +546,24 @@ scm_read_sexp (scm_t_wchar chr, SCM port)
/* Build the head of the list structure. */
ans = tl = scm_cons (tmp, SCM_EOL);
- while (terminating_char != (c = flush_ws (port, FUNC_NAME)))
+ while (terminating_char != (c = flush_ws (port, opts, FUNC_NAME)))
{
SCM new_tail;
- if (c == ')' || (SCM_SQUARE_BRACKETS_P && c == ']'))
+ if (c == ')' || (opts->square_brackets_p && c == ']'))
scm_i_input_error (FUNC_NAME, port,
"in pair: mismatched close paren: ~A",
scm_list_1 (SCM_MAKE_CHAR (c)));
scm_ungetc (c, port);
- tmp = scm_read_expression (port);
+ tmp = scm_read_expression (port, opts);
/* See above note about scm_sym_dot. */
if (c == '.' && scm_is_eq (scm_sym_dot, tmp))
{
- SCM_SETCDR (tl, scm_read_expression (port));
+ SCM_SETCDR (tl, scm_read_expression (port, opts));
- c = flush_ws (port, FUNC_NAME);
+ c = flush_ws (port, opts, FUNC_NAME);
if (terminating_char != c)
scm_i_input_error (FUNC_NAME, port,
"in pair: missing close paren", SCM_EOL);
@@ -431,7 +576,7 @@ scm_read_sexp (scm_t_wchar chr, SCM port)
}
exit:
- return maybe_annotate_source (ans, port, line, column);
+ return maybe_annotate_source (ans, port, opts, line, column);
}
#undef FUNC_NAME
@@ -487,7 +632,7 @@ skip_intraline_whitespace (SCM port)
}
static SCM
-scm_read_string (int chr, SCM port)
+scm_read_string (int chr, SCM port, scm_t_read_opts *opts)
#define FUNC_NAME "scm_lreadr"
{
/* For strings smaller than C_STR, this function creates only one Scheme
@@ -526,7 +671,7 @@ scm_read_string (int chr, SCM port)
case '\\':
break;
case '\n':
- if (SCM_HUNGRY_EOL_ESCAPES_P)
+ if (opts->hungry_eol_escapes_p)
skip_intraline_whitespace (port);
continue;
case '0':
@@ -554,19 +699,19 @@ scm_read_string (int chr, SCM port)
c = '\010';
break;
case 'x':
- if (SCM_R6RS_ESCAPES_P)
+ if (opts->r6rs_escapes_p)
SCM_READ_HEX_ESCAPE (10, ';');
else
SCM_READ_HEX_ESCAPE (2, '\0');
break;
case 'u':
- if (!SCM_R6RS_ESCAPES_P)
+ if (!opts->r6rs_escapes_p)
{
SCM_READ_HEX_ESCAPE (4, '\0');
break;
}
case 'U':
- if (!SCM_R6RS_ESCAPES_P)
+ if (!opts->r6rs_escapes_p)
{
SCM_READ_HEX_ESCAPE (6, '\0');
break;
@@ -593,13 +738,13 @@ scm_read_string (int chr, SCM port)
str = scm_string_concatenate_reverse (str, SCM_UNDEFINED, SCM_UNDEFINED);
}
- return maybe_annotate_source (str, port, line, column);
+ return maybe_annotate_source (str, port, opts, line, column);
}
#undef FUNC_NAME
static SCM
-scm_read_number (scm_t_wchar chr, SCM port)
+scm_read_number (scm_t_wchar chr, SCM port, scm_t_read_opts *opts)
{
SCM result, str = SCM_EOL;
char local_buffer[READER_BUFFER_SIZE], *buffer;
@@ -611,7 +756,7 @@ scm_read_number (scm_t_wchar chr, SCM port)
int column = SCM_COL (port) - 1;
scm_ungetc (chr, port);
- buffer = read_complete_token (port, local_buffer, sizeof local_buffer,
+ buffer = read_complete_token (port, opts, local_buffer, sizeof local_buffer,
&bytes_read);
str = scm_from_stringn (buffer, bytes_read, pt->encoding, pt->ilseq_handler);
@@ -620,30 +765,30 @@ scm_read_number (scm_t_wchar chr, SCM port)
if (scm_is_false (result))
{
/* Return a symbol instead of a number */
- if (SCM_CASE_INSENSITIVE_P)
+ if (opts->case_insensitive_p)
str = scm_string_downcase_x (str);
result = scm_string_to_symbol (str);
}
else if (SCM_NIMP (result))
- result = maybe_annotate_source (result, port, line, column);
+ result = maybe_annotate_source (result, port, opts, line, column);
SCM_COL (port) += scm_i_string_length (str);
return result;
}
static SCM
-scm_read_mixed_case_symbol (scm_t_wchar chr, SCM port)
+scm_read_mixed_case_symbol (scm_t_wchar chr, SCM port, scm_t_read_opts *opts)
{
SCM result;
int ends_with_colon = 0;
size_t bytes_read;
- int postfix = scm_is_eq (SCM_PACK (SCM_KEYWORD_STYLE), scm_keyword_postfix);
+ int postfix = (opts->keyword_style == KEYWORD_STYLE_POSTFIX);
char local_buffer[READER_BUFFER_SIZE], *buffer;
scm_t_port *pt = SCM_PTAB_ENTRY (port);
SCM str;
scm_ungetc (chr, port);
- buffer = read_complete_token (port, local_buffer, sizeof local_buffer,
+ buffer = read_complete_token (port, opts, local_buffer, sizeof local_buffer,
&bytes_read);
if (bytes_read > 0)
ends_with_colon = buffer[bytes_read - 1] == ':';
@@ -653,7 +798,7 @@ scm_read_mixed_case_symbol (scm_t_wchar chr, SCM port)
str = scm_from_stringn (buffer, bytes_read - 1,
pt->encoding, pt->ilseq_handler);
- if (SCM_CASE_INSENSITIVE_P)
+ if (opts->case_insensitive_p)
str = scm_string_downcase_x (str);
result = scm_symbol_to_keyword (scm_string_to_symbol (str));
}
@@ -662,7 +807,7 @@ scm_read_mixed_case_symbol (scm_t_wchar chr, SCM port)
str = scm_from_stringn (buffer, bytes_read,
pt->encoding, pt->ilseq_handler);
- if (SCM_CASE_INSENSITIVE_P)
+ if (opts->case_insensitive_p)
str = scm_string_downcase_x (str);
result = scm_string_to_symbol (str);
}
@@ -672,7 +817,7 @@ scm_read_mixed_case_symbol (scm_t_wchar chr, SCM port)
}
static SCM
-scm_read_number_and_radix (scm_t_wchar chr, SCM port)
+scm_read_number_and_radix (scm_t_wchar chr, SCM port, scm_t_read_opts *opts)
#define FUNC_NAME "scm_lreadr"
{
SCM result;
@@ -710,7 +855,7 @@ scm_read_number_and_radix (scm_t_wchar chr, SCM port)
radix = 10;
}
- buffer = read_complete_token (port, local_buffer, sizeof local_buffer,
+ buffer = read_complete_token (port, opts, local_buffer, sizeof local_buffer,
&read);
pt = SCM_PTAB_ENTRY (port);
@@ -730,7 +875,7 @@ scm_read_number_and_radix (scm_t_wchar chr, SCM port)
#undef FUNC_NAME
static SCM
-scm_read_quote (int chr, SCM port)
+scm_read_quote (int chr, SCM port, scm_t_read_opts *opts)
{
SCM p;
long line = SCM_LINUM (port);
@@ -767,8 +912,8 @@ scm_read_quote (int chr, SCM port)
abort ();
}
- p = scm_cons2 (p, scm_read_expression (port), SCM_EOL);
- return maybe_annotate_source (p, port, line, column);
+ p = scm_cons2 (p, scm_read_expression (port, opts), SCM_EOL);
+ return maybe_annotate_source (p, port, opts, line, column);
}
SCM_SYMBOL (sym_syntax, "syntax");
@@ -777,7 +922,7 @@ SCM_SYMBOL (sym_unsyntax, "unsyntax");
SCM_SYMBOL (sym_unsyntax_splicing, "unsyntax-splicing");
static SCM
-scm_read_syntax (int chr, SCM port)
+scm_read_syntax (int chr, SCM port, scm_t_read_opts *opts)
{
SCM p;
long line = SCM_LINUM (port);
@@ -814,14 +959,14 @@ scm_read_syntax (int chr, SCM port)
abort ();
}
- p = scm_cons2 (p, scm_read_expression (port), SCM_EOL);
- return maybe_annotate_source (p, port, line, column);
+ p = scm_cons2 (p, scm_read_expression (port, opts), SCM_EOL);
+ return maybe_annotate_source (p, port, opts, line, column);
}
static SCM
-scm_read_nil (int chr, SCM port)
+scm_read_nil (int chr, SCM port, scm_t_read_opts *opts)
{
- SCM id = scm_read_mixed_case_symbol (chr, port);
+ SCM id = scm_read_mixed_case_symbol (chr, port, opts);
if (!scm_is_eq (id, sym_nil))
scm_i_input_error ("scm_read_nil", port,
@@ -867,7 +1012,7 @@ scm_read_boolean (int chr, SCM port)
}
static SCM
-scm_read_character (scm_t_wchar chr, SCM port)
+scm_read_character (scm_t_wchar chr, SCM port, scm_t_read_opts *opts)
#define FUNC_NAME "scm_lreadr"
{
char buffer[READER_CHAR_NAME_MAX_SIZE];
@@ -877,7 +1022,8 @@ scm_read_character (scm_t_wchar chr, SCM port)
int overflow;
scm_t_port *pt;
- overflow = read_token (port, buffer, READER_CHAR_NAME_MAX_SIZE, &bytes_read);
+ overflow = read_token (port, opts, buffer, READER_CHAR_NAME_MAX_SIZE,
+ &bytes_read);
if (overflow)
scm_i_input_error (FUNC_NAME, port, "character name too long", SCM_EOL);
@@ -973,7 +1119,7 @@ scm_read_character (scm_t_wchar chr, SCM port)
#undef FUNC_NAME
static SCM
-scm_read_keyword (int chr, SCM port)
+scm_read_keyword (int chr, SCM port, scm_t_read_opts *opts)
{
SCM symbol;
@@ -982,7 +1128,7 @@ scm_read_keyword (int chr, SCM port)
to adapt to the delimiters currently valid of symbols.
XXX: This implementation allows sloppy syntaxes like `#: key'. */
- symbol = scm_read_expression (port);
+ symbol = scm_read_expression (port, opts);
if (!scm_is_symbol (symbol))
scm_i_input_error ("scm_read_keyword", port,
"keyword prefix `~a' not followed by a symbol: ~s",
@@ -992,34 +1138,38 @@ scm_read_keyword (int chr, SCM port)
}
static SCM
-scm_read_vector (int chr, SCM port, long line, int column)
+scm_read_vector (int chr, SCM port, scm_t_read_opts *opts,
+ long line, int column)
{
/* Note: We call `scm_read_sexp ()' rather than READER here in order to
guarantee that it's going to do what we want. After all, this is an
implementation detail of `scm_read_vector ()', not a desirable
property. */
- return maybe_annotate_source (scm_vector (scm_read_sexp (chr, port)),
- port, line, column);
+ return maybe_annotate_source (scm_vector (scm_read_sexp (chr, port, opts)),
+ port, opts, line, column);
}
static SCM
-scm_read_array (int chr, SCM port, long line, int column)
+scm_read_array (int chr, SCM port, scm_t_read_opts *opts,
+ long line, int column)
{
SCM result = scm_i_read_array (port, chr);
if (scm_is_false (result))
return result;
else
- return maybe_annotate_source (result, port, line, column);
+ return maybe_annotate_source (result, port, opts, line, column);
}
static SCM
-scm_read_srfi4_vector (int chr, SCM port, long line, int column)
+scm_read_srfi4_vector (int chr, SCM port, scm_t_read_opts *opts,
+ long line, int column)
{
- return scm_read_array (chr, port, line, column);
+ return scm_read_array (chr, port, opts, line, column);
}
static SCM
-scm_read_bytevector (scm_t_wchar chr, SCM port, long line, int column)
+scm_read_bytevector (scm_t_wchar chr, SCM port, scm_t_read_opts *opts,
+ long line, int column)
{
chr = scm_getc (port);
if (chr != 'u')
@@ -1034,8 +1184,8 @@ scm_read_bytevector (scm_t_wchar chr, SCM port, long
line, int column)
goto syntax;
return maybe_annotate_source
- (scm_u8_list_to_bytevector (scm_read_sexp (chr, port)),
- port, line, column);
+ (scm_u8_list_to_bytevector (scm_read_sexp (chr, port, opts)),
+ port, opts, line, column);
syntax:
scm_i_input_error ("read_bytevector", port,
@@ -1045,7 +1195,8 @@ scm_read_bytevector (scm_t_wchar chr, SCM port, long
line, int column)
}
static SCM
-scm_read_guile_bit_vector (scm_t_wchar chr, SCM port, long line, int column)
+scm_read_guile_bit_vector (scm_t_wchar chr, SCM port, scm_t_read_opts *opts,
+ long line, int column)
{
/* Read the `#*10101'-style read syntax for bit vectors in Guile. This is
terribly inefficient but who cares? */
@@ -1063,7 +1214,7 @@ scm_read_guile_bit_vector (scm_t_wchar chr, SCM port,
long line, int column)
return maybe_annotate_source
(scm_bitvector (scm_reverse_x (s_bits, SCM_EOL)),
- port, line, column);
+ port, opts, line, column);
}
static SCM
@@ -1091,37 +1242,40 @@ scm_read_scsh_block_comment (scm_t_wchar chr, SCM port)
}
static SCM
-scm_read_shebang (scm_t_wchar chr, SCM port)
+scm_read_shebang (scm_t_wchar chr, SCM port, scm_t_read_opts *opts)
{
- int c = 0;
- if ((c = scm_get_byte_or_eof (port)) != 'r')
- {
- scm_ungetc (c, port);
- return scm_read_scsh_block_comment (chr, port);
- }
- if ((c = scm_get_byte_or_eof (port)) != '6')
- {
- scm_ungetc (c, port);
- scm_ungetc ('r', port);
- return scm_read_scsh_block_comment (chr, port);
- }
- if ((c = scm_get_byte_or_eof (port)) != 'r')
- {
- scm_ungetc (c, port);
- scm_ungetc ('6', port);
- scm_ungetc ('r', port);
- return scm_read_scsh_block_comment (chr, port);
- }
- if ((c = scm_get_byte_or_eof (port)) != 's')
+ char name[READER_DIRECTIVE_NAME_MAX_SIZE + 1];
+ int c;
+ int i = 0;
+
+ /* FIXME: Maybe handle shebang at the beginning of a file differently? */
+ while (i <= READER_DIRECTIVE_NAME_MAX_SIZE)
{
- scm_ungetc (c, port);
- scm_ungetc ('r', port);
- scm_ungetc ('6', port);
- scm_ungetc ('r', port);
- return scm_read_scsh_block_comment (chr, port);
+ c = scm_getc (port);
+ if (c == EOF)
+ scm_i_input_error ("skip_block_comment", port,
+ "unterminated `#! ... !#' comment", SCM_EOL);
+ else if (('a' <= c && c <= 'z') || ('0' <= c && c <= '9') || c == '-')
+ name[i++] = c;
+ else if (CHAR_IS_DELIMITER (c))
+ {
+ scm_ungetc (c, port);
+ name[i] = '\0';
+ if (0 == strcmp ("r6rs", name))
+ ; /* Silently ignore */
+ else if (0 == strcmp ("fold-case", name))
+ set_per_port_case_insensitive_p (port, opts, 1);
+ else if (0 == strcmp ("no-fold-case", name))
+ set_per_port_case_insensitive_p (port, opts, 0);
+ else
+ break;
+
+ return SCM_UNSPECIFIED;
+ }
}
-
- return SCM_UNSPECIFIED;
+ while (i > 0)
+ scm_ungetc (name[--i], port);
+ return scm_read_scsh_block_comment (chr, port);
}
static SCM
@@ -1163,16 +1317,17 @@ scm_read_r6rs_block_comment (scm_t_wchar chr, SCM port)
}
static SCM
-scm_read_commented_expression (scm_t_wchar chr, SCM port)
+scm_read_commented_expression (scm_t_wchar chr, SCM port,
+ scm_t_read_opts *opts)
{
scm_t_wchar c;
- c = flush_ws (port, (char *) NULL);
+ c = flush_ws (port, opts, (char *) NULL);
if (EOF == c)
scm_i_input_error ("read_commented_expression", port,
"no expression after #; comment", SCM_EOL);
scm_ungetc (c, port);
- scm_read_expression (port);
+ scm_read_expression (port, opts);
return SCM_UNSPECIFIED;
}
@@ -1274,7 +1429,7 @@ scm_read_extended_symbol (scm_t_wchar chr, SCM port)
/* Top-level token readers, i.e., dispatchers. */
static SCM
-scm_read_sharp_extension (int chr, SCM port)
+scm_read_sharp_extension (int chr, SCM port, scm_t_read_opts *opts)
{
SCM proc;
@@ -1287,7 +1442,8 @@ scm_read_sharp_extension (int chr, SCM port)
got = scm_call_2 (proc, SCM_MAKE_CHAR (chr), port);
- if (scm_is_pair (got) && !scm_i_has_source_properties (got))
+ if (opts->record_positions_p && SCM_NIMP (got)
+ && !scm_i_has_source_properties (got))
scm_i_set_source_properties_x (got, line, column, SCM_FILENAME (port));
return got;
@@ -1299,39 +1455,40 @@ scm_read_sharp_extension (int chr, SCM port)
/* The reader for the sharp `#' character. It basically dispatches reads
among the above token readers. */
static SCM
-scm_read_sharp (scm_t_wchar chr, SCM port, long line, int column)
+scm_read_sharp (scm_t_wchar chr, SCM port, scm_t_read_opts *opts,
+ long line, int column)
#define FUNC_NAME "scm_lreadr"
{
SCM result;
chr = scm_getc (port);
- result = scm_read_sharp_extension (chr, port);
+ result = scm_read_sharp_extension (chr, port, opts);
if (!scm_is_eq (result, SCM_UNSPECIFIED))
return result;
switch (chr)
{
case '\\':
- return (scm_read_character (chr, port));
+ return (scm_read_character (chr, port, opts));
case '(':
- return (scm_read_vector (chr, port, line, column));
+ return (scm_read_vector (chr, port, opts, line, column));
case 's':
case 'u':
case 'f':
case 'c':
/* This one may return either a boolean or an SRFI-4 vector. */
- return (scm_read_srfi4_vector (chr, port, line, column));
+ return (scm_read_srfi4_vector (chr, port, opts, line, column));
case 'v':
- return (scm_read_bytevector (chr, port, line, column));
+ return (scm_read_bytevector (chr, port, opts, line, column));
case '*':
- return (scm_read_guile_bit_vector (chr, port, line, column));
+ return (scm_read_guile_bit_vector (chr, port, opts, line, column));
case 't':
case 'T':
case 'F':
return (scm_read_boolean (chr, port));
case ':':
- return (scm_read_keyword (chr, port));
+ return (scm_read_keyword (chr, port, opts));
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case '@':
@@ -1342,7 +1499,7 @@ scm_read_sharp (scm_t_wchar chr, SCM port, long line, int
column)
case 'h':
case 'l':
#endif
- return (scm_read_array (chr, port, line, column));
+ return (scm_read_array (chr, port, opts, line, column));
case 'i':
case 'e':
@@ -1354,7 +1511,7 @@ scm_read_sharp (scm_t_wchar chr, SCM port, long line, int
column)
if (next_c != EOF)
scm_ungetc (next_c, port);
if (next_c == '(')
- return scm_read_array (chr, port, line, column);
+ return scm_read_array (chr, port, opts, line, column);
/* Fall through. */
}
#endif
@@ -1368,21 +1525,21 @@ scm_read_sharp (scm_t_wchar chr, SCM port, long line,
int column)
case 'X':
case 'I':
case 'E':
- return (scm_read_number_and_radix (chr, port));
+ return (scm_read_number_and_radix (chr, port, opts));
case '{':
return (scm_read_extended_symbol (chr, port));
case '!':
- return (scm_read_shebang (chr, port));
+ return (scm_read_shebang (chr, port, opts));
case ';':
- return (scm_read_commented_expression (chr, port));
+ return (scm_read_commented_expression (chr, port, opts));
case '`':
case '\'':
case ',':
- return (scm_read_syntax (chr, port));
+ return (scm_read_syntax (chr, port, opts));
case 'n':
- return (scm_read_nil (chr, port));
+ return (scm_read_nil (chr, port, opts));
default:
- result = scm_read_sharp_extension (chr, port);
+ result = scm_read_sharp_extension (chr, port, opts);
if (scm_is_eq (result, SCM_UNSPECIFIED))
{
/* To remain compatible with 1.8 and earlier, the following
@@ -1406,7 +1563,7 @@ scm_read_sharp (scm_t_wchar chr, SCM port, long line, int
column)
#undef FUNC_NAME
static SCM
-scm_read_expression (SCM port)
+scm_read_expression (SCM port, scm_t_read_opts *opts)
#define FUNC_NAME "scm_read_expression"
{
while (1)
@@ -1424,22 +1581,22 @@ scm_read_expression (SCM port)
(void) scm_read_semicolon_comment (chr, port);
break;
case '[':
- if (!SCM_SQUARE_BRACKETS_P)
- return (scm_read_mixed_case_symbol (chr, port));
+ if (!opts->square_brackets_p)
+ return (scm_read_mixed_case_symbol (chr, port, opts));
/* otherwise fall through */
case '(':
- return (scm_read_sexp (chr, port));
+ return (scm_read_sexp (chr, port, opts));
case '"':
- return (scm_read_string (chr, port));
+ return (scm_read_string (chr, port, opts));
case '\'':
case '`':
case ',':
- return (scm_read_quote (chr, port));
+ return (scm_read_quote (chr, port, opts));
case '#':
{
long line = SCM_LINUM (port);
int column = SCM_COL (port) - 1;
- SCM result = scm_read_sharp (chr, port, line, column);
+ SCM result = scm_read_sharp (chr, port, opts, line, column);
if (scm_is_eq (result, SCM_UNSPECIFIED))
/* We read a comment or some such. */
break;
@@ -1450,23 +1607,23 @@ scm_read_expression (SCM port)
scm_i_input_error (FUNC_NAME, port, "unexpected \")\"", SCM_EOL);
break;
case ']':
- if (SCM_SQUARE_BRACKETS_P)
+ if (opts->square_brackets_p)
scm_i_input_error (FUNC_NAME, port, "unexpected \"]\"", SCM_EOL);
/* otherwise fall through */
case EOF:
return SCM_EOF_VAL;
case ':':
- if (scm_is_eq (SCM_PACK (SCM_KEYWORD_STYLE), scm_keyword_prefix))
- return scm_symbol_to_keyword (scm_read_expression (port));
+ if (opts->keyword_style == KEYWORD_STYLE_PREFIX)
+ return scm_symbol_to_keyword (scm_read_expression (port, opts));
/* Fall through. */
default:
{
if (((chr >= '0') && (chr <= '9'))
|| (strchr ("+-.", chr)))
- return (scm_read_number (chr, port));
+ return (scm_read_number (chr, port, opts));
else
- return (scm_read_mixed_case_symbol (chr, port));
+ return (scm_read_mixed_case_symbol (chr, port, opts));
}
}
}
@@ -1483,18 +1640,21 @@ SCM_DEFINE (scm_read, "read", 0, 1, 0,
"Any whitespace before the next token is discarded.")
#define FUNC_NAME s_scm_read
{
+ scm_t_read_opts opts;
int c;
if (SCM_UNBNDP (port))
port = scm_current_input_port ();
SCM_VALIDATE_OPINPORT (1, port);
- c = flush_ws (port, (char *) NULL);
+ init_read_options (port, &opts);
+
+ c = flush_ws (port, &opts, (char *) NULL);
if (EOF == c)
return SCM_EOF_VAL;
scm_ungetc (c, port);
- return (scm_read_expression (port));
+ return (scm_read_expression (port, &opts));
}
#undef FUNC_NAME
diff --git a/test-suite/tests/reader.test b/test-suite/tests/reader.test
index 60c853c..6e02255 100644
--- a/test-suite/tests/reader.test
+++ b/test-suite/tests/reader.test
@@ -401,6 +401,19 @@
(lambda ()
(read-disable 'hungry-eol-escapes))))))
+(with-test-prefix "per-port-read-options"
+ (pass-if "case-sensitive"
+ (equal? '(guile GuiLe gUIle)
+ (with-read-options '(case-insensitive)
+ (lambda ()
+ (with-input-from-string "GUIle #!no-fold-case GuiLe gUIle"
+ (lambda ()
+ (list (read) (read) (read))))))))
+ (pass-if "case-insensitive"
+ (equal? '(GUIle guile guile)
+ (with-input-from-string "GUIle #!fold-case GuiLe gUIle"
+ (lambda ()
+ (list (read) (read) (read)))))))
(with-test-prefix "#;"
(for-each
--
1.7.10.4
- [PATCH] Implement per-port reader options and #!fold-case,
Mark H Weaver <=