--- /dev/null
+/* PSPP - a program for statistical analysis.
+ Copyright (C) 2021 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
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+#include <limits.h>
+
+#include "language/command.h"
+#include "language/lexer/lexer.h"
+#include "language/lexer/macro.h"
+#include "language/lexer/scan.h"
+#include "language/lexer/token.h"
+#include "libpspp/message.h"
+
+#include "gl/xalloc.h"
+
+#include "gettext.h"
+#define _(msgid) gettext (msgid)
+
+static bool
+force_macro_id (struct lexer *lexer)
+{
+ return lex_token (lexer) == T_MACRO_ID || lex_force_id (lexer);
+}
+
+static bool
+match_macro_id (struct lexer *lexer, const char *keyword)
+{
+ if (keyword[0] != '!')
+ return lex_match_id (lexer, keyword);
+ else if (lex_token (lexer) == T_MACRO_ID
+ && lex_id_match_n (ss_cstr (keyword), lex_tokss (lexer), 4))
+ {
+ lex_get (lexer);
+ return true;
+ }
+ else
+ return false;
+}
+
+/* Obtains a quoted string from LEXER and then tokenizes the quoted string's
+ content to obtain a single TOKEN. Returns true if successful, false
+ otherwise. The caller takes ownership of TOKEN on success, otherwise TOKEN
+ is indeterminate. */
+static bool
+parse_quoted_token (struct lexer *lexer, struct token *token)
+{
+ if (!lex_force_string (lexer))
+ return false;
+
+ struct substring s = lex_tokss (lexer);
+ struct string_lexer slex;
+ string_lexer_init (&slex, s.string, s.length, SEG_MODE_INTERACTIVE, true);
+ struct token another_token = { .type = T_STOP };
+ if (!string_lexer_next (&slex, token)
+ || string_lexer_next (&slex, &another_token))
+ {
+ token_uninit (token);
+ token_uninit (&another_token);
+ lex_error (lexer, _("String must contain exactly one token."));
+ return false;
+ }
+ lex_get (lexer);
+ return true;
+}
+
+int
+cmd_define (struct lexer *lexer, struct dataset *ds UNUSED)
+{
+ if (!force_macro_id (lexer))
+ return CMD_FAILURE;
+
+ /* Parse macro name. */
+ struct macro *m = xmalloc (sizeof *m);
+ *m = (struct macro) {
+ .name = ss_xstrdup (lex_tokss (lexer)),
+ .file_name = xstrdup_if_nonnull (lex_get_file_name (lexer)),
+ .first_line = lex_get_first_line_number (lexer, 0),
+ };
+ lex_get (lexer);
+
+ if (!lex_force_match (lexer, T_LPAREN))
+ goto error;
+
+ size_t allocated_params = 0;
+ while (!lex_match (lexer, T_RPAREN))
+ {
+ if (m->n_params >= allocated_params)
+ m->params = x2nrealloc (m->params, &allocated_params,
+ sizeof *m->params);
+
+ size_t param_index = m->n_params++;
+ struct macro_param *p = &m->params[param_index];
+ *p = (struct macro_param) { .expand_arg = true };
+
+ /* Parse parameter name. */
+ if (match_macro_id (lexer, "!POSITIONAL"))
+ {
+ if (param_index > 0 && !m->params[param_index - 1].positional)
+ {
+ lex_error (lexer, _("Positional parameters must precede "
+ "keyword parameters."));
+ goto error;
+ }
+
+ p->positional = true;
+ p->name = xasprintf ("!%zu", param_index + 1);
+ }
+ else
+ {
+ if (lex_token (lexer) == T_MACRO_ID)
+ {
+ lex_error (lexer, _("Keyword macro parameter must be named in "
+ "definition without \"!\" prefix."));
+ goto error;
+ }
+ if (!lex_force_id (lexer))
+ goto error;
+
+ if (is_macro_keyword (lex_tokss (lexer)))
+ {
+ lex_error (lexer, _("Cannot use macro keyword \"%s\" "
+ "as an argument name."),
+ lex_tokcstr (lexer));
+ goto error;
+ }
+
+ p->positional = false;
+ p->name = xasprintf ("!%s", lex_tokcstr (lexer));
+ lex_get (lexer);
+
+ if (!lex_force_match (lexer, T_EQUALS))
+ goto error;
+ }
+
+ /* Parse default value. */
+ if (match_macro_id (lexer, "!DEFAULT"))
+ {
+ if (!lex_force_match (lexer, T_LPAREN))
+ goto error;
+
+ /* XXX Should this handle balanced inner parentheses? */
+ while (!lex_match (lexer, T_RPAREN))
+ {
+ if (lex_token (lexer) == T_ENDCMD)
+ {
+ lex_error_expecting (lexer, ")");
+ goto error;
+ }
+ char *syntax = lex_next_representation (lexer, 0, 0);
+ const struct macro_token mt = {
+ .token = *lex_next (lexer, 0),
+ .representation = ss_cstr (syntax),
+ };
+ macro_tokens_add (&p->def, &mt);
+ free (syntax);
+
+ lex_get (lexer);
+ }
+ }
+
+ if (match_macro_id (lexer, "!NOEXPAND"))
+ p->expand_arg = false;
+
+ if (match_macro_id (lexer, "!TOKENS"))
+ {
+ if (!lex_force_match (lexer, T_LPAREN)
+ || !lex_force_int_range (lexer, "!TOKENS", 1, INT_MAX))
+ goto error;
+ p->arg_type = ARG_N_TOKENS;
+ p->n_tokens = lex_integer (lexer);
+ lex_get (lexer);
+ if (!lex_force_match (lexer, T_RPAREN))
+ goto error;
+ }
+ else if (match_macro_id (lexer, "!CHAREND"))
+ {
+ p->arg_type = ARG_CHAREND;
+ p->charend = (struct token) { .type = T_STOP };
+
+ if (!lex_force_match (lexer, T_LPAREN)
+ || !parse_quoted_token (lexer, &p->charend)
+ || !lex_force_match (lexer, T_RPAREN))
+ goto error;
+ }
+ else if (match_macro_id (lexer, "!ENCLOSE"))
+ {
+ p->arg_type = ARG_ENCLOSE;
+ p->enclose[0] = p->enclose[1] = (struct token) { .type = T_STOP };
+
+ if (!lex_force_match (lexer, T_LPAREN)
+ || !parse_quoted_token (lexer, &p->enclose[0])
+ || !lex_force_match (lexer, T_COMMA)
+ || !parse_quoted_token (lexer, &p->enclose[1])
+ || !lex_force_match (lexer, T_RPAREN))
+ goto error;
+ }
+ else if (match_macro_id (lexer, "!CMDEND"))
+ p->arg_type = ARG_CMDEND;
+ else
+ {
+ lex_error_expecting (lexer, "!TOKENS", "!CHAREND",
+ "!ENCLOSE", "!CMDEND");
+ goto error;
+ }
+
+ if (lex_token (lexer) != T_RPAREN && !lex_force_match (lexer, T_SLASH))
+ goto error;
+ }
+
+ struct string body = DS_EMPTY_INITIALIZER;
+ while (!match_macro_id (lexer, "!ENDDEFINE"))
+ {
+ if (lex_token (lexer) != T_STRING)
+ {
+ lex_error (lexer, _("Expecting macro body or !ENDDEFINE"));
+ ds_destroy (&body);
+ goto error;
+ }
+
+ ds_put_substring (&body, lex_tokss (lexer));
+ ds_put_byte (&body, '\n');
+ lex_get (lexer);
+ }
+ m->last_line = lex_get_last_line_number (lexer, 0);
+
+ macro_tokens_from_string (&m->body, body.ss, lex_get_syntax_mode (lexer));
+ ds_destroy (&body);
+
+ lex_define_macro (lexer, m);
+
+ return CMD_SUCCESS;
+
+error:
+ macro_destroy (m);
+ return CMD_FAILURE;
+}
+
+int
+cmd_debug_expand (struct lexer *lexer, struct dataset *ds UNUSED)
+{
+ settings_set_mprint (true);
+
+ while (lex_token (lexer) != T_STOP)
+ {
+ if (!lex_next_is_from_macro (lexer, 0) && lex_token (lexer) != T_ENDCMD)
+ {
+ char *rep = lex_next_representation (lexer, 0, 0);
+ msg (MN, "unexpanded token \"%s\"", rep);
+ free (rep);
+ }
+ lex_get (lexer);
+ }
+ return CMD_SUCCESS;
+}
projects / pspp / blobdiff