along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
+
#include "lexer.h"
-#include <libpspp/message.h>
#include <c-ctype.h>
#include <c-strtod.h>
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
-#include <libpspp/assertion.h>
#include <language/command.h>
-#include <libpspp/message.h>
#include <data/settings.h>
+#include <libpspp/assertion.h>
#include <libpspp/getl.h>
+#include <libpspp/message.h>
#include <libpspp/str.h>
#include <output/journal.h>
#include <output/text-item.h>
if (lexer->dot)
{
lexer->dot = 0;
- lexer->token = '.';
+ lexer->token = T_ENDCMD;
return;
}
else if (!lex_get_line (lexer))
{
char *tail;
- /* `-' can introduce a negative number, or it can be a
- token by itself. If it is not followed by a digit or a
- decimal point, it is definitely not a number.
- Otherwise, it might be either, but most of the time we
- want it as a number. When the syntax calls for a `-'
- token, lex_negative_to_dash() must be used to break
- negative numbers into two tokens. */
+ /* `-' can introduce a negative number, or it can be a token by
+ itself. */
if (*lexer->prog == '-')
{
- ds_put_char (&lexer->tokstr, *lexer->prog++);
+ ds_put_byte (&lexer->tokstr, *lexer->prog++);
while (c_isspace ((unsigned char) *lexer->prog))
lexer->prog++;
if (!c_isdigit ((unsigned char) *lexer->prog) && *lexer->prog != '.')
{
- lexer->token = '-';
+ lexer->token = T_DASH;
break;
}
lexer->token = T_NEG_NUM;
/* Parse the number, copying it into tokstr. */
while (c_isdigit ((unsigned char) *lexer->prog))
- ds_put_char (&lexer->tokstr, *lexer->prog++);
+ ds_put_byte (&lexer->tokstr, *lexer->prog++);
if (*lexer->prog == '.')
{
- ds_put_char (&lexer->tokstr, *lexer->prog++);
+ ds_put_byte (&lexer->tokstr, *lexer->prog++);
while (c_isdigit ((unsigned char) *lexer->prog))
- ds_put_char (&lexer->tokstr, *lexer->prog++);
+ ds_put_byte (&lexer->tokstr, *lexer->prog++);
}
if (*lexer->prog == 'e' || *lexer->prog == 'E')
{
- ds_put_char (&lexer->tokstr, *lexer->prog++);
+ ds_put_byte (&lexer->tokstr, *lexer->prog++);
if (*lexer->prog == '+' || *lexer->prog == '-')
- ds_put_char (&lexer->tokstr, *lexer->prog++);
+ ds_put_byte (&lexer->tokstr, *lexer->prog++);
while (c_isdigit ((unsigned char) *lexer->prog))
- ds_put_char (&lexer->tokstr, *lexer->prog++);
+ ds_put_byte (&lexer->tokstr, *lexer->prog++);
}
/* Parse as floating point. */
lexer->tokval = 0.0;
ds_clear (&lexer->tokstr);
- ds_put_char (&lexer->tokstr, '0');
+ ds_put_byte (&lexer->tokstr, '0');
}
break;
lexer->token = parse_string (lexer, CHARACTER_STRING);
break;
- case '(': case ')': case ',': case '=': case '+': case '/':
- case '[': case ']':
- lexer->token = *lexer->prog++;
- break;
+ case '+':
+ lexer->token = T_PLUS;
+ lexer->prog++;
+ break;
+
+ case '/':
+ lexer->token = T_SLASH;
+ lexer->prog++;
+ break;
+
+ case '=':
+ lexer->token = T_EQUALS;
+ lexer->prog++;
+ break;
+
+ case '(':
+ lexer->token = T_LPAREN;
+ lexer->prog++;
+ break;
+
+ case ')':
+ lexer->token = T_RPAREN;
+ lexer->prog++;
+ break;
+
+ case '[':
+ lexer->token = T_LBRACK;
+ lexer->prog++;
+ break;
+
+ case ']':
+ lexer->token = T_RBRACK;
+ lexer->prog++;
+ break;
+
+ case ',':
+ lexer->token = T_COMMA;
+ lexer->prog++;
+ break;
case '*':
if (*++lexer->prog == '*')
lexer->token = T_EXP;
}
else
- lexer->token = '*';
+ lexer->token = T_ASTERISK;
break;
case '<':
if (lexer->token == T_STOP)
ds_put_cstr (&s, _("Syntax error at end of file"));
- else if (lexer->token == '.')
+ else if (lexer->token == T_ENDCMD)
ds_put_cstr (&s, _("Syntax error at end of command"));
else
{
int
lex_end_of_command (struct lexer *lexer)
{
- if (lexer->token != '.')
+ if (lexer->token != T_ENDCMD)
{
lex_error (lexer, _("expecting end of command"));
return CMD_FAILURE;
/* If TOK is the current token, skips it and returns true
Otherwise, returns false. */
bool
-lex_match (struct lexer *lexer, int t)
+lex_match (struct lexer *lexer, enum token_type t)
{
if (lexer->token == t)
{
/* If the current token is T, skips the token. Otherwise, reports an
error and returns from the current function with return value false. */
bool
-lex_force_match (struct lexer *lexer, int t)
+lex_force_match (struct lexer *lexer, enum token_type t)
{
if (lexer->token == t)
{
/* Weird token functions. */
-/* Returns the first character of the next token, except that if the
- next token is not an identifier, the character returned will not be
- a character that can begin an identifier. Specifically, the
- hexstring lead-in X' causes lookahead() to return '. Note that an
- alphanumeric return value doesn't guarantee an ID token, it could
- also be a reserved-word token. */
-int
+/* Returns the likely type of the next token, or 0 if it's hard to tell. */
+enum token_type
lex_look_ahead (struct lexer *lexer)
{
if (lexer->put_token)
break;
if (lexer->dot)
- return '.';
+ return T_ENDCMD;
else if (!lex_get_line (lexer))
return 0;
return lexer->put_token;
}
- if ((toupper ((unsigned char) *lexer->prog) == 'X'
- || toupper ((unsigned char) *lexer->prog) == 'B'
- || toupper ((unsigned char) *lexer->prog) == 'O')
- && (lexer->prog[1] == '\'' || lexer->prog[1] == '"'))
- return '\'';
+ switch (toupper ((unsigned char) *lexer->prog))
+ {
+ case 'X': case 'B': case 'O':
+ if (lexer->prog[1] == '\'' || lexer->prog[1] == '"')
+ return T_STRING;
+ /* Fall through */
+
+ case '-':
+ return T_DASH;
- return *lexer->prog;
+ case '.':
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ return T_POS_NUM;
+
+ case '\'': case '"':
+ return T_STRING;
+
+ case '+':
+ return T_PLUS;
+
+ case '/':
+ return T_SLASH;
+
+ case '=':
+ return T_EQUALS;
+
+ case '(':
+ return T_LPAREN;
+
+ case ')':
+ return T_RPAREN;
+
+ case '[':
+ return T_LBRACK;
+
+ case ']':
+ return T_RBRACK;
+
+ case ',':
+ return T_COMMA;
+
+ case '*':
+ return lexer->prog[1] == '*' ? T_EXP : T_ASTERISK;
+
+ case '<':
+ return (lexer->prog[1] == '=' ? T_LE
+ : lexer->prog[1] == '>' ? T_NE
+ : T_LT);
+
+ case '>':
+ return lexer->prog[1] == '=' ? T_GE : T_GT;
+
+ case '~':
+ return lexer->prog[1] == '=' ? T_NE : T_NOT;
+
+ case '&':
+ return T_AND;
+
+ case '|':
+ return T_OR;
+
+ default:
+ if (lex_is_id1 (*lexer->prog))
+ return T_ID;
+ return 0;
+ }
}
}
/* Makes the current token become the next token to be read; the
current token is set to T. */
void
-lex_put_back (struct lexer *lexer, int t)
+lex_put_back (struct lexer *lexer, enum token_type t)
{
save_token (lexer);
lexer->token = t;
{
if (!getl_is_interactive (lexer->ss))
{
- while (lexer->token != T_STOP && lexer->token != '.')
+ while (lexer->token != T_STOP && lexer->token != T_ENDCMD)
lex_get (lexer);
}
else
&line_starts_command, &lexer->dot);
if (line_starts_command)
- lexer->put_token = '.';
+ lexer->put_token = T_ENDCMD;
lexer->prog = ds_cstr (&lexer->line_buffer);
return true;
/* Returns the name of a token. */
const char *
-lex_token_name (int token)
+lex_token_name (enum token_type token)
{
- if (lex_is_keyword (token))
- return lex_id_name (token);
- else if (token < 256)
+ switch (token)
{
- static char t[256][2];
- char *s = t[token];
- s[0] = token;
- s[1] = '\0';
- return s;
+ case T_ID:
+ case T_POS_NUM:
+ case T_NEG_NUM:
+ case T_STRING:
+ NOT_REACHED ();
+
+ case T_STOP:
+ return "";
+
+ 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_COMMA:
+ 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 "**";
}
- else
- NOT_REACHED ();
+
+ NOT_REACHED ();
}
/* Returns an ASCII representation of the current token as a
case T_POS_NUM:
case T_NEG_NUM:
return ds_xstrdup (&lexer->tokstr);
- break;
case T_STRING:
{
return token_rep;
}
- break;
-
- case T_STOP:
- token_rep = xmalloc (1);
- *token_rep = '\0';
- return token_rep;
-
- case T_EXP:
- return xstrdup ("**");
default:
return xstrdup (lex_token_name (lexer->token));
}
-
- NOT_REACHED ();
}
\f
/* Really weird functions. */
-/* Most of the time, a `-' is a lead-in to a negative number. But
- sometimes it's actually part of the syntax. If a dash can be part
- of syntax then this function is called to rip it off of a
- number. */
-void
-lex_negative_to_dash (struct lexer *lexer)
-{
- if (lexer->token == T_NEG_NUM)
- {
- lexer->token = T_POS_NUM;
- lexer->tokval = -lexer->tokval;
- ds_assign_substring (&lexer->tokstr, ds_substr (&lexer->tokstr, 1, SIZE_MAX));
- save_token (lexer);
- lexer->token = '-';
- }
-}
-
/* Skip a COMMENT command. */
void
lex_skip_comment (struct lexer *lexer)
return;
}
- if (lexer->put_token == '.')
+ if (lexer->put_token == T_ENDCMD)
break;
ds_cstr (&lexer->line_buffer); /* Ensures ds_end will point to a valid char */
break;
}
- ds_put_char (&lexer->tokstr, *lexer->prog++);
+ ds_put_byte (&lexer->tokstr, *lexer->prog++);
}
lexer->prog++;
\f
/* Token Accessor Functions */
-int
+enum token_type
lex_token (const struct lexer *lexer)
{
return lexer->token;
return lex_match_id (lexer, s);
else if (lexer->token != T_ID
|| !lex_id_match (ss_buffer (s, hyphen - s), ss_cstr (lexer->tokid))
- || lex_look_ahead (lexer) != '-')
+ || lex_look_ahead (lexer) != T_DASH)
return false;
else
{
lex_get (lexer);
- lex_force_match (lexer, '-');
+ lex_force_match (lexer, T_DASH);
lex_force_match_id (lexer, hyphen + 1);
return true;
}
projects / pspp-builds.git / blobdiff