[pure-lang-svn] SF.net SVN: pure-lang:[882] pure-csv

[<ag...@us...>]

Revision: 882
          http://pure-lang.svn.sourceforge.net/pure-lang/?rev=882&view=rev
Author:   agraef
Date:     2008-09-27 11:35:58 +0000 (Sat, 27 Sep 2008)

Log Message:
-----------
Initial import.

Added Paths:
-----------
    pure-csv/
    pure-csv/branches/
    pure-csv/releases/
    pure-csv/trunk/
    pure-csv/trunk/COPYING
    pure-csv/trunk/Makefile
    pure-csv/trunk/README
    pure-csv/trunk/csv.c
    pure-csv/trunk/csv.pure
    pure-csv/trunk/examples/
    pure-csv/trunk/examples/read-sample1.csv
    pure-csv/trunk/examples/read-sample2.csv
    pure-csv/trunk/examples/read-sample3.csv
    pure-csv/trunk/examples/read-sample4.csv
    pure-csv/trunk/examples/read-sample5.csv
    pure-csv/trunk/examples/read-samples.pure
    pure-csv/trunk/examples/write-sample1.csv
    pure-csv/trunk/examples/write-sample2.csv
    pure-csv/trunk/examples/write-sample3.csv
    pure-csv/trunk/examples/write-sample4.csv
    pure-csv/trunk/examples/write-samples.pure

Added: pure-csv/trunk/COPYING
===================================================================
--- pure-csv/trunk/COPYING	                        (rev 0)
+++ pure-csv/trunk/COPYING	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,340 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+     59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
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+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
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+distribute copies of the software, or if you modify it.
+
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+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
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+that everyone understands that there is no warranty for this free
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+  The precise terms and conditions for copying, distribution and
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+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
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+		     END OF TERMS AND CONDITIONS
+
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+    Copyright (C) <year>  <name of author>
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+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
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+    This program is distributed in the hope that it will be useful,
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+    This is free software, and you are welcome to redistribute it
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+The hypothetical commands `show w' and `show c' should show the appropriate
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+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.

Added: pure-csv/trunk/Makefile
===================================================================
--- pure-csv/trunk/Makefile	                        (rev 0)
+++ pure-csv/trunk/Makefile	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,41 @@
+
+# Package name and version number:
+dist = pure-csv-$(version)
+version = 0.1
+
+# Try to guess the installation prefix (this needs GNU make):
+prefix = $(patsubst %/bin/pure,%,$(shell which pure 2>/dev/null))
+ifeq ($(strip $(prefix)),)
+# Fall back to /usr/local.
+prefix = /usr/local
+endif
+
+# Platform-specific stuff, edit this as needed.
+#PIC = -fPIC # uncomment for x86-64 compilation
+DLL = .so # .dll on Windows
+
+DISTFILES = COPYING Makefile README examples/*.pure examples/*.csv \
+csv.c csv.pure
+
+all: csv$(DLL)
+
+csv$(DLL): csv.c
+	gcc -shared -o $@ $< $(PIC) -lpure
+
+clean:
+	rm -f *$(DLL) *~ *.a *.o
+
+install:
+	test -d "$(DESTDIR)$(prefix)/lib/pure" || mkdir -p "$(DESTDIR)$(prefix)/lib/pure"
+	cp csv.pure csv$(DLL) "$(DESTDIR)$(prefix)/lib/pure"
+
+uninstall:
+	rm -f "$(DESTDIR)$(prefix)/lib/pure/csv.pure" "$(DESTDIR)$(prefix)/lib/pure/csv$(DLL)"
+
+dist:
+	rm -rf $(dist)
+	mkdir $(dist) && mkdir $(dist)/examples
+	for x in $(DISTFILES); do ln -sf $$PWD/$$x $(dist)/$$x; done
+	rm -f $(dist).tar.gz
+	tar cfzh $(dist).tar.gz $(dist)
+	rm -rf $(dist)

Added: pure-csv/trunk/README
===================================================================
--- pure-csv/trunk/README	                        (rev 0)
+++ pure-csv/trunk/README	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,89 @@
+
+PURE-CSV - Comma Separated Value interface for the Pure programming language
+======== = ===== ========= ===== ========= === === ==== =========== ========
+
+The CSV library provides an interface to read and write comma separated value
+files. The reading and writing functions are loosely based on Python's CSV
+module (http://docs.python.org/lib/module-csv.html)
+
+INSTALLATION
+
+Run 'make' to compile the module and 'make install' (as root) to install it in
+the Pure library directory. This requires GNU make.
+
+The 'make install' step is only necessary for system-wide installation. 'make'
+will try to guess your Pure installation directory, if it gets it wrong, you
+can specify the installation prefix as follows: 'make install prefix=/usr'.
+Make sure that you get this right, otherwise the Pure interpreter won't be
+able to find the installed module.
+
+USAGE
+
+Data records are represented as lists of strings and numeric data. Dialects
+are created using csv_dialect with a list of specifications outlined in 
+csv.pure.
+
+- csv_list (s::string, dialect)
+  csv_list s::string
+  
+  Converts a CSV formatted string s to a list of fields according to the 
+  dialect specified. If no dialect is specified, conversion is performed using
+  RFC 4180 rules (http://www.ietf.org/rfc/rfc4180.txt). Invalidly formatted
+  CSV causes return of a 'csv_error msg' term (see NOTES below).
+  
+- csv_str (x:xs)
+  csv_str ((x:xs), dialect)
+  
+  Converts a list of fields, which includes only strings, integers, and
+  doubles to a CSV formatted string according to the dialect specified. If
+  no dialect is specified, conversion is performed using RFC 4180 rules
+  (http://www.ietf.org/rfc/rfc4180.txt). Lists that are not strings, integers,
+  or floats invoke a 'csv_error msg' term (see NOTES below).
+
+- csv_fgets (f::pointer, dialect)
+  csv_fgets f::pointer
+
+  Is equivalent to csv_list except that reading is from file f.
+
+- csv_fputs ((x:xs), dialect, f)
+  csv_fputs ((x:xs), f)
+
+  Is equivalent to csv_str except that writing is to file f.
+  
+- csv_fget (name::string, dialect)
+  csv_fget name::string
+  
+  Reads a named file and returns a list of records. These procedures should 
+  only be used on data files that are small enough to fit in the computers 
+  RAM.
+  
+- csv_fput (name::string, recs, dialect)
+  csv_fput (name::string, recs)
+  
+  Writes list of records to a named file. Each record is converted according
+  to the rules stated in the csv_str procedure.
+
+NOTES
+
+- Errors in the conversion routines (input that does not abide by the
+  dialect rules; records containing field types other than strings, integers
+  and floats) cause a special 'csv_error msg' term to be returned, where msg
+  is a string describing the particular error. To handle error conditions,
+  your application should either check for these, or define csv_error to
+  directly handle the error in some way (e.g., provide a default value, or
+  raise an exception). For instance:
+
+  csv_error msg = throw msg;
+
+- MS Excel files should be written using "=""0004""" if leading 0s are 
+  significant. Use the same technique if leading space is significant. Use this
+  quirk only if written files are going to be imported to MS Excel.
+
+EXAMPLES
+
+Examples are provided in the examples subdirectory. See "readsamples.pure" for
+reading csv files and "writesamples.pure" for writing.
+
+September 24, 2008
+Eddie Rucker
+er...@bm...

Added: pure-csv/trunk/csv.c
===================================================================
--- pure-csv/trunk/csv.c	                        (rev 0)
+++ pure-csv/trunk/csv.c	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,452 @@
+/* Port of CSV module from Q to Pure
+
+   Author: Eddie Rucker
+   Date:   July 3, 2008
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <pure/runtime.h>
+
+#define STRSIZE 128
+#define BUFSIZE 1024
+
+#define QUOTE_ALL 0
+#define QUOTE_STRINGS 1
+#define QUOTE_EMBEDDED 2
+
+#define error_handler(msg) \
+  return pure_app(pure_symbol(pure_sym("csv_error")), pure_cstring_dup(msg))
+
+/* Return a CSV record as a Pure string.
+   Input:
+     fp:    File pointer to read from
+     quote: Pure string representing CSV quotes
+
+   Output:
+     pure_string representing a CSV record. The string may have embedded '\n's.
+       Does not check for badly formated records.
+
+   Exceptions:
+     csv_error msg is invoked f there is a system memory allocation error,
+     beyond end of file, or a file error is encountered.
+*/
+pure_expr *c_csv_fgets(FILE *fp, char *quote) {
+  char *bf, *tb, *s;
+  int quote_count = 0, n_quote;
+  long sz = BUFSIZE, n = 0;
+  pure_expr *ret;
+
+  if (!(s = bf = (char *)malloc(sz))) {
+    error_handler("malloc error");
+  }
+
+  n_quote = strlen(quote);
+  while (1) {
+    s = bf + n;
+    if (n > sz) {
+      if (!(tb = realloc(bf, sz <<= 1))) {
+	free(bf);
+	error_handler("realloc error");
+      }
+      s = (bf = tb) + n;
+    }
+    tb = fgets(s, BUFSIZE, fp);
+    if (ferror(fp)) {
+      free(bf);
+      return 0;
+    }
+    if (tb == NULL) {
+      if (n == 0)
+	return NULL;
+      else
+	return pure_cstring(bf);
+    }
+    n += strlen(s);
+    if (*(bf+n-1) != '\n')
+      continue;
+    while (*s) {
+      if (!strncmp(s, quote, n_quote)) {
+	++quote_count;
+	s += n_quote;
+      } else 
+	++s;
+    }
+    if (!(quote_count & 1))
+      /* let pure handle freeing bf */
+      return pure_cstring(bf);
+  }
+}
+
+/* Convert a string to a number.
+   Input:
+     s: string to be converted.
+     cvt_flag: 0 -> no conversion, 1 -> attempt conversion
+
+   Output:
+     Pure int, Pure double, or Pure string depending on cvt_flag=1 and
+     s obeys strtol and strtod specs.
+*/
+pure_expr *convert_string(char *s, int cvt_flag) {
+  long i;
+  double d;
+  char *p;
+
+  if (cvt_flag) {
+    i = strtol(s, &p, 0);
+    if (*p == 0)
+      return pure_int(i);
+    d = strtod(s, &p);
+    if (*p == 0)
+      return pure_double(d);
+  }
+  return pure_cstring_dup(s);
+}
+
+#define putfld(len) \
+  if (n_fld + len >= fld_sz) { \
+    if (!(tfld = (char *)realloc(fld, fld_sz <<= 1))) \
+      goto done; \
+    fld = tfld; \
+  } \
+  fldp = fld + n_fld; \
+  strncpy(fldp, s, len); \
+  n_fld += len \
+
+
+#define putrec(qt) \
+  *(fldp + 1) = 0; \
+  if (n_rec >= rec_sz - 1) { \
+    if (!(trec = (pure_expr **)realloc(rec, (rec_sz+=64)*sizeof(pure_expr)))) \
+      goto done; \
+    rec = trec; \
+  } \
+  rec[n_rec++] = convert_string(fld, qt)
+
+#define free_params				\
+  free(delimiter);				\
+  free(escape);					\
+  free(quote);					\
+  free(lineterm);				\
+  free(elems)
+
+/* Convert a CSV string to a list of fields
+   input: 
+     dialect: (Conversion flag, field delimeter char, string delimeter char)
+     s: CSV formatted string
+
+   Output: record of fields
+
+   Exceptions:
+     Invokes 'csv_error MSG' if the string is badly formatted, or memory error
+
+   Notes:
+     \r char is treated as white space except inside "" 
+*/
+pure_expr *c_csvstr_to_list(char *s, pure_expr *dialect) {
+  size_t n_elems;
+  pure_expr **elems, **rec, **trec;
+  int n, st = 0, fld_sz = 256, n_fld, rec_sz = 64, n_ws = 0, n_rec = 0,
+    n_delimiter, n_escape, n_quote, n_lineterm, skipspace_f, esc_eq_quote,
+    quoting_style;
+  char *fld, *tfld, *fldp, errmsg[80], *delimiter, *escape, *quote, *lineterm;
+
+  if (!(pure_is_listv(dialect, &n_elems, &elems)
+	&& n_elems == 6
+	&& pure_is_cstring_dup(elems[0], &delimiter)
+	&& pure_is_cstring_dup(elems[1], &escape)
+	&& pure_is_cstring_dup(elems[2], &quote)
+	&& pure_is_int(elems[3], &quoting_style)
+	&& pure_is_cstring_dup(elems[4], &lineterm)
+	&& pure_is_int(elems[5], &skipspace_f)))
+    return 0;
+  
+  if (!(fld = (char *)malloc(fld_sz))) {
+    free_params;
+    error_handler("malloc error");
+  }
+
+  if (!(rec = (pure_expr **)malloc(rec_sz*sizeof(pure_expr)))) {
+    free(fld);  
+    free_params;
+    error_handler("malloc error");
+  }
+  n_delimiter = strlen(delimiter);
+  n_escape = strlen(escape);
+  n_quote = strlen(quote);
+  esc_eq_quote = !strcmp(escape, quote);
+  n_lineterm = strlen(lineterm);
+  fldp = fld;
+  while (st < 10) {
+    switch (st) {
+    case 0:
+      fldp = fld;
+      *fldp = 0;
+      n_fld = 0;
+      if (!strncmp(s, delimiter, n_delimiter)) {
+	putrec(QUOTE_ALL);
+	s += n_delimiter;
+      } else if (!strncmp(s, quote, n_quote)) {
+	s += n_quote;
+	st = 1;
+      } else if (!*s || *s == EOF || !strncmp(s, lineterm, n_lineterm)) {
+	putrec(QUOTE_ALL);
+	st = 10;
+      } else if (isspace(*s) && skipspace_f) {
+	++s;
+      } else if (!strncmp(s, escape, n_escape)) {
+	sprintf(errmsg, "column %d: unexpected escape.", n_fld+1);
+	st = 20;
+      } else {
+	putfld(1);
+	++s;
+	st = 4;
+      }
+      break;
+    case 1:
+      if (!strncmp(s, quote, n_quote)) {
+	s += n_quote;
+	st = 2;
+      } else if (!*s || *s == EOF) {
+	sprintf(errmsg, "column %d: expected {%s}.", 
+		n_fld+1, quote);
+	st = 20;
+      } else if (!strncmp(s, escape, n_escape)) {
+	s += n_escape;
+	putfld(n_escape);
+	++s;
+      } else {
+	putfld(1);
+	++s;
+      }
+      break;
+    case 2:
+      if (!strncmp(s, quote, n_quote) && esc_eq_quote) {
+	putfld(n_quote);
+	s += n_quote;
+	st = 1;
+      } else if (!strncmp(s, delimiter, n_delimiter)) {
+	putrec(QUOTE_ALL);
+	s += n_delimiter;
+	st = 0;
+      } else if (!*s || *s == EOF || !strncmp(s, lineterm, n_lineterm)) {
+	putrec(QUOTE_ALL);
+	st = 10;
+      } else if (isspace(*s)) {
+	++s;
+	st = 3;
+      } else {
+	sprintf(errmsg, "column %d: expected {%s}.", 
+		n_fld+1, delimiter);
+	st = 20;
+      }
+      break;
+    case 3:
+      if (!strncmp(s, delimiter, n_delimiter)) {
+	putrec(QUOTE_ALL);
+	s += n_delimiter;
+	st = 0;
+      } else if (!*s || *s == '\n' || *s == EOF) {
+	putrec(QUOTE_ALL);
+	st = 10;
+      } else if (isspace(*s)) {
+	++s;
+      } else {
+	sprintf(errmsg, "column %d: expected {%s}.",
+		n_fld+1, delimiter);
+	st = 20;
+      }
+      break;
+    case 4:
+      if (!strncmp(s, quote, n_quote) || !strncmp(s, escape, n_escape)) {
+	sprintf(errmsg, "column %d: expected {%s}.", 
+		n_fld+1, delimiter);
+	st = 20;
+      } else if (!strncmp(s, delimiter, n_delimiter)) {
+	fldp -= n_ws;
+	n_fld -= n_ws;
+	putrec(quoting_style);
+	s += n_delimiter;
+	st = 0;
+      } else if (!*s || *s == EOF || !strncmp(s, lineterm, n_lineterm)) {
+	putrec(quoting_style);
+	st = 10;
+      } else if (isspace(*s)) {
+	n_ws = n_ws ? n_ws+1 : 1;
+	putfld(1);
+	++s;
+      } else {
+	n_ws = 0;
+	putfld(1);
+	++s;
+      }
+      break;
+    }
+  }
+ done:
+  free(fld);
+  free_params;
+  if (st == 10)
+    return pure_listv(n_rec, realloc(rec, sizeof(pure_expr)*n_rec));
+  else {
+    for (n = 0; n < n_rec; ++n)
+      pure_free(rec[n]);
+    free(rec);
+    if (st==20)
+      error_handler(errmsg);
+    error_handler("malloc error");
+
+  }
+}
+
+#define resize_str \
+  if (len > sz) { \
+    if (!(ts = (char *)realloc(s, sz <<= 1))) { \
+      free(s); \
+      error_handler("realloc error"); \
+    } \
+    s = ts; \
+  } \
+  t = s + mrk
+
+
+#define insert					\
+  mrk = len;					\
+  len += strlen(tb);				\
+  resize_str;					\
+  strncpy(t, tb, len - mrk)
+
+/* Convert list to a CSV formated string 
+   Input:
+     dialect: (Conversion flag, field delimeter char, string delimeter char)
+     list: record to be converted
+   
+   Output: CSV formatted string
+   
+   Exceptions:
+     Invokes csv_error if no more memory is available or if field cannot be
+     converted.
+
+   Notes:
+     \r char is treated as white space except inside "" 
+*/
+pure_expr *c_list_to_csvstr(pure_expr *list, pure_expr *dialect) {
+  size_t n_elems;
+  int i, n, k, sz = 256, mrk, quote_cnt, delim_cnt, lineterm_cnt, len = 0, 
+    skipspace_f, n_escape, n_quote, n_delimiter, n_lineterm, quoting_style,
+    ival;
+  char *s, *ts, *p, *sval, tb[48], errmsg[80], *escape, *quote, *delimiter,
+    *lineterm;
+  double dval;
+  pure_expr **elems, **xs;
+  register char *t;
+  
+  if (!(pure_is_listv(dialect, &n_elems, &elems)
+	&& n_elems == 6
+	&& pure_is_string_dup(elems[0], &delimiter)
+	&& pure_is_string_dup(elems[1], &escape)
+	&& pure_is_string_dup(elems[2], &quote)
+	&& pure_is_int(elems[3], &quoting_style)
+	&& pure_is_string_dup(elems[4], &lineterm)
+	&& pure_is_int(elems[5], &skipspace_f)
+	&& pure_is_listv(list, &n_elems, &xs))) {
+    return 0;
+  }
+  
+  if (!(s = (char *)malloc(sz))) {
+    free_params;
+    error_handler("malloc error");
+  }
+  
+  n_escape = strlen(escape);
+  n_quote = strlen(quote);
+  n_delimiter = strlen(delimiter);
+  n_lineterm = strlen(lineterm);
+  for (i = 0; i < n_elems; ++i) {
+    if (pure_is_int(xs[i], &ival)) {
+      if (!quoting_style)
+        sprintf(tb, "%s%d%s%s", quote, ival, quote, delimiter);
+      else
+        sprintf(tb, "%d%s", ival, delimiter);
+      insert;
+    } else if (pure_is_double(xs[i], &dval)) {
+      if (!quoting_style)
+        sprintf(tb, "%s%.16g%s%s", quote, dval, quote, delimiter);
+      else
+        sprintf(tb, "%.16g%s", dval, delimiter);
+      insert;
+    } else if (pure_is_cstring_dup(xs[i], &sval)) {
+      quote_cnt = 0;
+      delim_cnt = 0;
+      lineterm_cnt = 0;
+      p = sval;
+      if (skipspace_f && quoting_style == QUOTE_EMBEDDED)
+        while (isspace(*p)
+               && strncmp(p, quote, n_delimiter)
+               && strncmp(p, delimiter, n_delimiter)
+               && strncmp(p, lineterm, n_lineterm))
+          ++p;
+      k = p - sval;
+      mrk = len;
+      while (*p) {
+        if (!strncmp(p, quote, n_quote)) {
+          ++quote_cnt;
+          p += n_quote;
+          len += n_escape + n_quote;
+        } else if (!strncmp(p, delimiter, n_delimiter)) {
+          ++delim_cnt;
+          p += n_delimiter;
+          len += n_delimiter;
+        } else if (!strncmp(p, lineterm, n_lineterm)) {
+          ++lineterm_cnt;
+          p += n_lineterm;
+          len += n_lineterm;
+        } else {
+          ++len;
+          ++p;
+        }
+      }
+      len += n_delimiter;
+      p = sval + k;
+      if (quoting_style == QUOTE_EMBEDDED
+	  && !(quote_cnt+delim_cnt+lineterm_cnt)) {
+        resize_str;
+        k = len - mrk - 1;
+        strncpy(t, p, k);
+        t += k;
+      } else {
+        /* Add space for surrounding quotes */
+        len += n_quote << 1;
+        resize_str;
+        strncpy(t, quote, n_quote);
+        t += n_quote;
+        while (*p) {
+          if (!strncmp(p, quote, n_quote)) {
+            strncpy(t, escape, n_escape);
+            t += n_escape;
+            strncpy(t, quote, n_quote);
+            t += n_quote;
+            p += n_quote;
+          } else
+            *t++ = *p++;
+        }
+        strncpy(t, quote, n_quote);
+        t += n_quote;
+      }
+      strncpy(t, delimiter, n_delimiter);
+      t += n_delimiter;
+    } else {
+      sprintf(errmsg, "field %d: invalid conversion type.", 
+	      i+1);
+      free_params;
+      error_handler(errmsg);
+    }
+  }
+  mrk = (len -= n_delimiter); /* write over last delimiter */
+  len += n_lineterm;
+  resize_str;
+  strcpy(t, lineterm);
+  free_params;
+  return pure_cstring((char *)realloc(s, len+1));
+}

Added: pure-csv/trunk/csv.pure
===================================================================
--- pure-csv/trunk/csv.pure	                        (rev 0)
+++ pure-csv/trunk/csv.pure	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,178 @@
+/* This file is part of the Pure programming system.
+
+   The Pure programming system is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option) any
+   later version.
+
+   The Pure programming system is distributed in the hope that it will be
+   useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/* The CSV library provides an interface to read and write comma separated
+   value files. The reading and writing functions are loosely based on
+   Python's csv module (http://docs.python.org/lib/module-csv.html)
+
+   Author: Robert E. Rucker
+   Email: er...@bm...
+   Date: July 15, 2008
+*/
+
+using "lib:csv";
+using system;
+
+/* User may define csv_error for custom error handling. */
+csv_error msg;
+
+private c_csv_fgets c_csvstr_to_list c_list_to_csvstr;
+
+/* Read a string with embedded '\n's within quotes. No error checking! */
+extern expr *c_csv_fgets(FILE *fp, char *quote);
+
+/* Convert a CSV string to a list (record).
+   s:       CSV formated string to be converted to a list of fields.
+   Dialect: CSV format specification. If none is given, defaults to
+            RFC4180 for Windows and UNIX for all other OSs.
+   NOTE: Rec must contain ONLY strings, integers, and floating point numbers.
+         If a field is some other type, the 'csv_error MSG' rule is invoked.
+*/
+extern expr *c_csvstr_to_list(char *str, expr *dialect);
+
+/* Convert a list (record) to a CSV string.
+   Rec:     list of fields to be converted to CSV format.
+   Dialect: CSV format specification. If none is given, defaults to
+            RFC4180 for Windows and UNIX for all other OSs.
+   NOTE: Rec must contain ONLY strings, integers, and floating point numbers.
+         If a field is some other type, the 'csv_error MSG' rule is invoked.
+*/
+extern expr *c_list_to_csvstr(expr *list, expr *dialect);
+
+/* Public dialect Options
+CSV_DELIMITER:      Field delimiter. Defaults to ",".
+
+CSV_ESCAPE:         Embedded escape character. Defaults to "\"".
+                    Reading: The escape character is dropped and
+                             the next char is inserted into the field.
+                    Writing: The escape character is written into the
+                             output stream.
+
+CSV_QUOTE:          Quote character. Defaults to "\"".
+                    Note: If embedded quotes are doubled, csv_escape must equal
+                          csv_quote. The csv_dialect function will
+                          automatically set the csv_escape character to
+                          csv_quote if csv_escape is not specified.
+
+CSV_QUOTING_STYLE:  Quoting options: Defaults to csv_quote_strings.
+                    See QuoteStyle constants below.
+
+CSV_LINETERMINATOR: Record terminator. Defaults to "\r\n".
+
+CSV_SKIPSPACE:      Skip white space flag. Defaults to true.
+                    Reading/Writing: If true, white spaces before fields are
+                                     removed. Quoted fields always retain
+                                     white space.
+*/
+const CSV_QUOTE_ALL = 0;
+const CSV_QUOTE_STRINGS = 1;
+const CSV_QUOTE_EMBEDDED = 2;
+
+const CSV_DELIMITER = 0;
+const CSV_ESCAPE = 1;
+const CSV_QUOTE = 2;
+const CSV_QUOTING_STYLE = 3;
+const CSV_LINETERMINATOR = 4;
+const CSV_SKIPSPACE = 5;
+
+/* Defaults are set to RFC 4180 (http://www.ietf.org/rfc/rfc4180.txt) except
+   for the \r\n pair */
+let csv_defaults = [",", "\"", "\"", 1, "\n", 1];
+
+/* Create a dialect base on the list of dialect options given above.
+   See RFC4180 and EXCEL constants below for example usage.
+*/
+csv_dialect opts
+  = zipwith ((lookup) opts2) (0..5) csv_defaults
+    when
+      opts2 = if any (\(x=>y) -> x==CSV_ESCAPE) opts then
+                opts
+              else
+                opts + [CSV_ESCAPE=>(lookup opts CSV_QUOTE "\"")];
+    end
+    with
+      lookup [] k::int v = v;
+      lookup ((x=>y):xs) k::int _ = y if k == x;
+      lookup ((x=>y):xs) k::int v = lookup xs k v;
+    end;
+
+const CSV_RFC4180 = csv_dialect [CSV_LINETERMINATOR => "\r\n"];
+const CSV_UNIX = csv_defaults;
+const CSV_EXCEL = csv_dialect [CSV_QUOTING_STYLE => CSV_QUOTE_EMBEDDED];
+const CSV_DEFAULTS 
+	=	if (substr sysinfo 0 5) == "mingw" then
+			CSV_RFC4180
+		else
+			CSV_UNIX;
+
+/* List to CSV string conversion functions */
+	csv_str rec@[]
+| csv_str rec@(_:_)
+	=	c_list_to_csvstr rec CSV_DEFAULTS;
+	
+	csv_str (rec@[], dialect@(_:_))
+| csv_str (rec@(_:_), dialect @(_:_))
+	= c_list_to_csvstr rec dialect;
+	
+/* File writing functions */
+  csv_fputs (rec@[], f::pointer)
+| csv_fputs (rec@(_:_), f::pointer)
+  = fputs (c_list_to_csvstr rec CSV_DEFAULTS) f;
+
+  csv_fputs (rec@[], dialect@(_:_), f::pointer)
+| csv_fputs (rec@(_:_), dialect@(_:_), f::pointer)
+  = fputs (c_list_to_csvstr rec dialect) f;
+
+/* CSV string to list converstion functions */
+csv_list s::string
+	=	c_csvstr_to_list s CSV_DEFAULTS;
+csv_list (s::string, dialect@(_:_))
+	= c_csvstr_to_list s dialect;
+
+/* File reading functions */
+csv_fgets f::pointer
+  = c_csvstr_to_list (c_csv_fgets f (CSV_DEFAULTS!CSV_QUOTE)) CSV_DEFAULTS;
+csv_fgets (f::pointer, dialect@(_:_))
+  = c_csvstr_to_list (c_csv_fgets f (dialect!CSV_QUOTE)) dialect;
+
+/* Read a whole file at one time */
+csv_fget (name::string, dialect@(_:_))
+	=	read (csv_fgets (f, dialect)) []
+		with
+			read s acc = fclose f $$ reverse acc if feof f;
+			read s acc = read (csv_fgets (f, dialect)) (s:acc);
+		end
+		when
+			f = fopen name "r";
+		end;
+		
+csv_fget name::string
+	=	csv_fget (name, CSV_DEFAULTS);
+	
+/* Write a whole file at one time */
+csv_fput (name::string, recs, dialect@(_:_))
+	=	write recs f
+		with
+			write [] f = fclose f $$ ();
+			write (x:xs) f = csv_fputs (x, dialect, f) $$ write xs f;
+		end
+		when
+			f = fopen name "w";
+		end;
+		
+csv_fput (name::string, recs)
+	= csv_fput (name, recs, CSV_DEFAULTS);

Added: pure-csv/trunk/examples/read-sample1.csv
===================================================================
--- pure-csv/trunk/examples/read-sample1.csv	                        (rev 0)
+++ pure-csv/trunk/examples/read-sample1.csv	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,7 @@
+,,4,"0004" 
+"embedded
+new
+lines", "4", 0.1, "----"
+"this, has an embedded ,"   ,, 3.2, "0000" 
+"embedded ""quotes""",  "-10", 0 , "    "
+,	,	, 2.3e-4 , 54-23
\ No newline at end of file

Added: pure-csv/trunk/examples/read-sample2.csv
===================================================================
--- pure-csv/trunk/examples/read-sample2.csv	                        (rev 0)
+++ pure-csv/trunk/examples/read-sample2.csv	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,4 @@
+		4	"0004" 
+"this	 has an embedded tab"	3.2	"0000"
+" this""quotes"""	"-10, 0" 	 "    " 
+					 2.3e-4 	 54-23 
\ No newline at end of file

Added: pure-csv/trunk/examples/read-sample3.csv
===================================================================
--- pure-csv/trunk/examples/read-sample3.csv	                        (rev 0)
+++ pure-csv/trunk/examples/read-sample3.csv	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,4 @@
+		4	'0004'
+'this	 has an embedded tab'   		 3.2	 '0000' 
+'embedded ''quotes'''	  '-10'	 0 	 '    '
+					 2.3e-4 	 54-23
\ No newline at end of file

Added: pure-csv/trunk/examples/read-sample4.csv
===================================================================
--- pure-csv/trunk/examples/read-sample4.csv	                        (rev 0)
+++ pure-csv/trunk/examples/read-sample4.csv	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,4 @@
+,,4,"0004" 
+"%"a,b%"", 3.2, "0000" 
+"a","b","%"%"",9
+4,3,,,-9.4

Added: pure-csv/trunk/examples/read-sample5.csv
===================================================================
--- pure-csv/trunk/examples/read-sample5.csv	                        (rev 0)
+++ pure-csv/trunk/examples/read-sample5.csv	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,4 @@
+,,4,"0004" 
+"this, has an embedded ,"   ,, 3.2, "0000" 
+embedded ""quotes"",  "-10", 0 , "    "
+,"	,	, 2.3e-4 , "54-23

Added: pure-csv/trunk/examples/read-samples.pure
===================================================================
--- pure-csv/trunk/examples/read-samples.pure	                        (rev 0)
+++ pure-csv/trunk/examples/read-samples.pure	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,27 @@
+#!/usr/local/bin/pure -x
+
+using csv;
+using system;
+
+/* Define a few dialects */
+const QUOTE_ALL = csv_dialect [CSV_QUOTING_STYLE=>CSV_QUOTE_ALL];
+const TAB_DELIM = csv_dialect [CSV_DELIMITER=>"\t"];
+const TAB_DELIM_SINGLE_QUOTE = csv_dialect [CSV_DELIMITER=>"\t", CSV_QUOTE=>"'"];
+const ESC_QUOTES = csv_dialect [CSV_ESCAPE=>"%"];
+
+main
+	=	puts "Reading 'read-sample1.csv' (standard CSV)" $$
+    puts (str $ csv_fget "read-sample1.csv") $$
+    puts "\nReading 'read-sample1.csv' (standard CSV, no conversions)" $$
+    puts (str $ csv_fget ("read-sample1.csv", QUOTE_ALL)) $$
+    puts "\nReading 'read-sample2.csv' (tab delimitied)" $$
+    puts (str $ csv_fget ("read-sample2.csv", TAB_DELIM)) $$
+    puts "\nReading 'read-sample3.csv' (tab delimited, single quoted)" $$
+    puts (str $ csv_fget ("read-sample3.csv", TAB_DELIM_SINGLE_QUOTE)) $$
+    puts "\nReading 'read-sample4.csv' (escaped quotes)" $$
+    puts (str $ csv_fget ("read-sample4.csv", ESC_QUOTES)) $$
+    puts "\nReading 'read-sample5.csv' (Malformed)" $$
+    puts (str $ csv_fget ("read-sample5.csv", CSV_DEFAULTS)) $$
+    puts "\ndone." $$ ();
+    
+main;


Property changes on: pure-csv/trunk/examples/read-samples.pure
___________________________________________________________________
Added: svn:executable
   + *

Added: pure-csv/trunk/examples/write-sample1.csv
===================================================================
--- pure-csv/trunk/examples/write-sample1.csv	                        (rev 0)
+++ pure-csv/trunk/examples/write-sample1.csv	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,3 @@
+"this"," that ","23","-3",""
+"a ""b""","c c","10","3.2"," "
+"a, b","","0","0","00"

Added: pure-csv/trunk/examples/write-sample2.csv
===================================================================
--- pure-csv/trunk/examples/write-sample2.csv	                        (rev 0)
+++ pure-csv/trunk/examples/write-sample2.csv	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,3 @@
+"this	y"	" that "	23	-3	""
+"a ""b"""	"c c"	10	3.2	" "
+"a, b"	""	0	0	"00"

Added: pure-csv/trunk/examples/write-sample3.csv
===================================================================
--- pure-csv/trunk/examples/write-sample3.csv	                        (rev 0)
+++ pure-csv/trunk/examples/write-sample3.csv	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,3 @@
+'this	y'	' that '	23	-3	''
+'a ''b'''	'c c'	10	3.2	' '
+'a, b'	''	0	0	'00'

Added: pure-csv/trunk/examples/write-sample4.csv
===================================================================
--- pure-csv/trunk/examples/write-sample4.csv	                        (rev 0)
+++ pure-csv/trunk/examples/write-sample4.csv	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,3 @@
+"this"," that ",23,-3,""
+"a %"b%"","c c",10,3.2," "
+"a, b","",0,0,"00"

Added: pure-csv/trunk/examples/write-samples.pure
===================================================================
--- pure-csv/trunk/examples/write-samples.pure	                        (rev 0)
+++ pure-csv/trunk/examples/write-samples.pure	2008-09-27 11:35:58 UTC (rev 882)
@@ -0,0 +1,44 @@
+#!/usr/local/bin/pure -x
+
+/* To run:
+   At the command line> pure -i writesamples.pure
+   At the prompt ==> main;
+   Using your favorite editor open the write samples to see what was wrought.
+*/
+
+using csv;
+using system;
+
+/* Define a few dialects */
+const QUOTE_ALL = csv_dialect [CSV_QUOTING_STYLE=>CSV_QUOTE_ALL];
+const TAB_DELIM = csv_dialect [CSV_DELIMITER=>"\t"];
+const TAB_DELIM_SINGLE_QUOTE = csv_dialect [CSV_DELIMITER=>"\t", CSV_QUOTE=>"'"];
+const ESC_QUOTES = csv_dialect [CSV_ESCAPE=>"%"];
+
+/* Define a few sample data lists */
+let sample1 = [["this", " that ", 23, -3.0, ""],
+               ["a \"b\"", "c c", 10, 3.2, " "],
+               ["a, b", "", 0, 0.0, "00"]];
+
+let sample2 = [["this\ty", " that ", 23, -3.0, ""],
+               ["a \"b\"", "c c", 10, 3.2, " "],
+               ["a, b", "", 0, 0.0, "00"]];
+
+let sample3 = [["this\ty", " that ", 23, -3.0, ""],
+               ["a 'b'", "c c", 10, 3.2, " "],
+               ["a, b", "", 0, 0.0, "00"]];
+               
+main
+  = puts "Writing 'write-sample1.csv' (standard CSV)" $$
+    puts (str $ csv_fput ("write-sample1.csv", sample1)) $$
+    puts "\nWriting 'write-sample1.csv' (standard CSV, no conversions)" $$
+    puts (str $ csv_fput ("write-sample1.csv", sample1, QUOTE_ALL)) $$
+    puts "\nWriting 'write-sample2.csv' (tab delimitied)" $$
+    puts (str $ csv_fput ("write-sample2.csv", sample2, TAB_DELIM)) $$
+    puts "\nWriting 'write-sample3.csv' (tab delimited, single quoted)" $$
+    puts (str $ csv_fput ("write-sample3.csv", sample3, TAB_DELIM_SINGLE_QUOTE)) $$
+    puts "\nWriting 'write-sample4.csv' (escaped quotes)" $$
+    puts (str $ csv_fput ("write-sample4.csv", sample1, ESC_QUOTES)) $$
+    puts "\ndone." $$ ();
+    
+main;


Property changes on: pure-csv/trunk/examples/write-samples.pure
___________________________________________________________________
Added: svn:executable
   + *


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