/* PSPP - a program for statistical analysis.
- Copyright (C) 1997-9, 2000, 2005 Free Software Foundation, Inc.
+ Copyright (C) 1997-9, 2000, 2005, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
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
*/
#include <config.h>
-#include "identifier.h"
+#include "data/identifier.h"
-#include <assert.h>
#include <string.h>
-#include <libpspp/assertion.h>
+#include <unistr.h>
+#include <unictype.h>
+
+#include "libpspp/assertion.h"
+#include "libpspp/cast.h"
+
+#include "gl/c-ctype.h"
+
+#include "gettext.h"
+#define _(msgid) gettext (msgid)
+
+/* Tokens. */
+
+/* Returns TYPE as a string, e.g. "ID" for T_ID. */
+const char *
+token_type_to_name (enum token_type type)
+{
+ switch (type)
+ {
+#define TOKEN_TYPE(TYPE) case T_##TYPE: return #TYPE;
+ TOKEN_TYPES
+#undef TOKEN_TYPE
+ default:
+ return "unknown token type";
+ }
+}
+
+/* Returns an ASCII string that yields TOKEN if it appeared in a syntax file,
+ as a statically allocated constant string. This function returns NULL for
+ tokens that don't have any fixed string representation, such as identifier
+ and number tokens. */
+const char *
+token_type_to_string (enum token_type token)
+{
+ switch (token)
+ {
+ case T_ID:
+ case T_POS_NUM:
+ case T_NEG_NUM:
+ case T_STRING:
+ case T_MACRO_ID:
+ case T_MACRO_PUNCT:
+ case T_STOP:
+ return NULL;
+
+ case T_ENDCMD:
+ return ".";
+
+ case T_PLUS:
+ return "+";
+
+ case T_DASH:
+ return "-";
+
+ case T_ASTERISK:
+ return "*";
+
+ case T_SLASH:
+ return "/";
+
+ case T_EQUALS:
+ return "=";
+
+ case T_LPAREN:
+ return "(";
+
+ case T_RPAREN:
+ return ")";
+
+ case T_LBRACK:
+ return "[";
+
+ case T_RBRACK:
+ return "]";
+
+ case T_LCURLY:
+ return "{";
+
+ case T_RCURLY:
+ return "}";
+
+ case T_COMMA:
+ return ",";
+
+ case T_SEMICOLON:
+ return ";";
+
+ case T_COLON:
+ return ":";
+
+ case T_AND:
+ return "AND";
+
+ case T_OR:
+ return "OR";
+
+ case T_NOT:
+ return "NOT";
+
+ case T_EQ:
+ return "EQ";
+
+ case T_GE:
+ return ">=";
+
+ case T_GT:
+ return ">";
+
+ case T_LE:
+ return "<=";
+
+ case T_LT:
+ return "<";
+
+ case T_NE:
+ return "~=";
+
+ case T_ALL:
+ return "ALL";
+
+ case T_BY:
+ return "BY";
+
+ case T_TO:
+ return "TO";
+
+ case T_WITH:
+ return "WITH";
+
+ case T_EXP:
+ return "**";
+ }
+
+ NOT_REACHED ();
+}
/* Recognizing identifiers. */
-/* Returns true if C may be the first character in an
+static bool
+is_ascii_id1 (unsigned char c)
+{
+ return c_isalpha (c) || c == '@' || c == '#' || c == '$';
+}
+
+static bool
+is_ascii_idn (unsigned char c)
+{
+ return is_ascii_id1 (c) || isdigit (c) || c == '.' || c == '_';
+}
+
+/* Returns true if C may be the first byte in an identifier in the current
+ locale.
+
+ (PSPP is transitioning to using Unicode internally for syntax, so please
+ use lex_uc_is_id1() instead, if possible.) */
+bool
+lex_is_id1 (char c)
+{
+ return is_ascii_id1 (c) || (unsigned char) c >= 128;
+}
+
+/* Returns true if C may be a byte in an identifier other than the first.
+
+ (PSPP is transitioning to using Unicode internally for syntax, so please
+ use lex_uc_is_idn() instead, if possible.) */
+bool
+lex_is_idn (char c)
+{
+ return is_ascii_idn (c) || (unsigned char) c >= 128;
+}
+
+/* Returns true if Unicode code point UC may be the first character in an
identifier in the current locale. */
bool
-lex_is_id1 (char c_)
+lex_uc_is_id1 (ucs4_t uc)
{
- unsigned char c = c_;
- return isalpha (c) || c == '@' || c == '#' || c == '$';
+ return (uc < 0x80
+ ? is_ascii_id1 (uc)
+ : (uc_is_general_category_withtable (uc,
+ UC_CATEGORY_MASK_L |
+ UC_CATEGORY_MASK_M |
+ UC_CATEGORY_MASK_S)
+ && uc != 0xfffc && uc != 0xfffd));
}
+/* Returns true if Unicode code point UC may be a character in an identifier
+ other than the first. */
+bool
+lex_uc_is_idn (ucs4_t uc)
+{
+ return (uc < 0x80
+ ? is_ascii_id1 (uc) || isdigit (uc) || uc == '.' || uc == '_'
+ : (uc_is_general_category_withtable (uc,
+ UC_CATEGORY_MASK_L |
+ UC_CATEGORY_MASK_M |
+ UC_CATEGORY_MASK_S |
+ UC_CATEGORY_MASK_N)
+ && uc != 0xfffc && uc != 0xfffd));
+}
-/* Returns true if C may be a character in an identifier other
- than the first. */
+/* Returns true if Unicode code point UC is a space that separates tokens. */
bool
-lex_is_idn (char c_)
+lex_uc_is_space (ucs4_t uc)
{
- unsigned char c = c_;
- return lex_is_id1 (c) || isdigit (c) || c == '.' || c == '_';
+ /* These are all of the Unicode characters in category Zs, Zl, or Zp. */
+ return (uc == ' ' || (uc <= 0x000d && uc >= 0x0009)
+ || (uc >= 0x80
+ && (uc == 0xa0 || uc == 0x85 || uc == 0x1680 || uc == 0x180e
+ || (uc >= 0x2000 && uc <= 0x200a)
+ || uc == 0x2028 || uc == 0x2029 || uc == 0x202f
+ || uc == 0x205f || uc == 0x3000)));
}
+
/* Returns the length of the longest prefix of STRING that forms
a valid identifier. Returns zero if STRING does not begin
with a valid identifier. */
size_t
lex_id_get_length (struct substring string)
{
- size_t length = 0;
- if (!ss_is_empty (string) && lex_is_id1 (ss_first (string)))
+ const uint8_t *s = CHAR_CAST (const uint8_t *, string.string);
+ size_t len = string.length;
+ size_t ofs;
+ int mblen;
+
+ for (ofs = 0; ofs < string.length; ofs += mblen)
{
- length = 1;
- while (length < ss_length (string)
- && lex_is_idn (ss_at (string, length)))
- length++;
+ ucs4_t uc;
+
+ mblen = u8_mbtouc (&uc, s + ofs, len - ofs);
+ if (!(ofs == 0 ? lex_uc_is_id1 (uc) : lex_uc_is_idn (uc)))
+ break;
}
- return length;
+
+ return ofs;
}
\f
/* Comparing identifiers. */
Keywords match if one of the following is true: KEYWORD and
TOKEN are identical, or TOKEN is at least 3 characters long
- and those characters are identical to KEYWORD. */
+ and those characters are identical to KEYWORD. (Letters that
+ differ only in case are considered identical.)
+
+ KEYWORD must be ASCII, but TOKEN may be ASCII or UTF-8. */
bool
lex_id_match (struct substring keyword, struct substring token)
+{
+ return lex_id_match_n (keyword, token, 3);
+}
+
+/* Returns true if TOKEN is a case-insensitive match for at least
+ the first N characters of KEYWORD.
+
+ KEYWORD must be ASCII, but TOKEN may be ASCII or UTF-8. */
+bool
+lex_id_match_n (struct substring keyword, struct substring token, size_t n)
{
size_t token_len = ss_length (token);
size_t keyword_len = ss_length (keyword);
- if (token_len >= 3 && token_len < keyword_len)
+ if (token_len >= n && token_len < keyword_len)
return ss_equals_case (ss_head (keyword, token_len), token);
else
return ss_equals_case (keyword, token);
{ T_TO, SS_LITERAL_INITIALIZER ("TO") },
{ T_WITH, SS_LITERAL_INITIALIZER ("WITH") },
};
-static const size_t keyword_cnt = sizeof keywords / sizeof *keywords;
+static const size_t n_keywords = sizeof keywords / sizeof *keywords;
/* Returns true if TOKEN is representable as a keyword. */
bool
-lex_is_keyword (int token)
+lex_is_keyword (enum token_type token)
{
const struct keyword *kw;
- for (kw = keywords; kw < &keywords[keyword_cnt]; kw++)
+ for (kw = keywords; kw < &keywords[n_keywords]; kw++)
if (kw->token == token)
return true;
return false;
if (ss_length (id) >= 2 && ss_length (id) <= 4)
{
const struct keyword *kw;
- for (kw = keywords; kw < &keywords[keyword_cnt]; kw++)
+ for (kw = keywords; kw < &keywords[n_keywords]; kw++)
if (ss_equals_case (kw->identifier, id))
return kw->token;
}
return T_ID;
}
-
-/* Returns the name for the given keyword token type. */
-const char *
-lex_id_name (int token)
-{
- const struct keyword *kw;
-
- for (kw = keywords; kw < &keywords[keyword_cnt]; kw++)
- if (kw->token == token)
- {
- /* A "struct substring" is not guaranteed to be
- null-terminated, as our caller expects, but in this
- case it always will be. */
- return ss_data (kw->identifier);
- }
- NOT_REACHED ();
-}
projects / pspp / blobdiff