1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 2021 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "language/command.h"
22 #include "language/lexer/lexer.h"
23 #include "language/lexer/macro.h"
24 #include "language/lexer/scan.h"
25 #include "language/lexer/token.h"
27 #include "gl/xalloc.h"
30 #define _(msgid) gettext (msgid)
33 force_macro_id (struct lexer *lexer)
35 return lex_token (lexer) == T_MACRO_ID || lex_force_id (lexer);
39 match_macro_id (struct lexer *lexer, const char *id)
42 return lex_match_id (lexer, id);
43 else if (lex_token (lexer) == T_MACRO_ID
44 && ss_equals_case (lex_tokss (lexer), ss_cstr (id)))
54 parse_quoted_token (struct lexer *lexer, struct token *token)
56 if (!lex_force_string (lexer))
59 struct substring s = lex_tokss (lexer);
60 struct string_lexer slex;
61 string_lexer_init (&slex, s.string, s.length, SEG_MODE_INTERACTIVE);
62 struct token another_token;
63 if (!string_lexer_next (&slex, token)
64 || string_lexer_next (&slex, &another_token))
66 token_destroy (token);
67 token_destroy (&another_token);
68 lex_error (lexer, _("String must contain exactly one token."));
76 cmd_define (struct lexer *lexer, struct dataset *ds UNUSED)
78 if (!force_macro_id (lexer))
81 /* Parse macro name. */
82 struct macro *m = xmalloc (sizeof *m);
83 *m = (struct macro) { .name = ss_xstrdup (lex_tokss (lexer)) };
86 if (!lex_force_match (lexer, T_LPAREN))
89 size_t allocated_params = 0;
90 size_t n_keywords = 0;
91 while (!lex_match (lexer, T_RPAREN))
93 if (m->n_params >= allocated_params)
94 m->params = x2nrealloc (m->params, &allocated_params,
97 struct macro_param *p = &m->params[m->n_params++];
98 *p = (struct macro_param) { .expand_arg = true };
100 /* Parse parameter name. */
101 if (match_macro_id (lexer, "!POSITIONAL"))
105 lex_error (lexer, _("Positional parameters must precede "
106 "keyword parameters."));
115 if (!lex_force_id (lexer))
118 p->name = ss_xstrdup (lex_tokss (lexer));
121 if (!lex_force_match (lexer, T_EQUALS))
125 /* Parse default value. */
126 if (match_macro_id (lexer, "!DEFAULT"))
128 if (!lex_force_match (lexer, T_LPAREN))
131 /* XXX Should this handle balanced inner parentheses? */
132 while (!lex_match (lexer, T_RPAREN))
134 if (lex_token (lexer) == T_ENDCMD)
136 lex_error_expecting (lexer, ")");
139 tokens_add (&p->def, lex_next (lexer, 0));
144 if (match_macro_id (lexer, "!NOEXPAND"))
145 p->expand_arg = false;
147 if (match_macro_id (lexer, "!TOKENS"))
149 if (!lex_force_match (lexer, T_LPAREN)
150 || !lex_force_int_range (lexer, "!TOKENS", 1, INT_MAX))
152 p->arg_type = ARG_N_TOKENS;
153 p->n_tokens = lex_integer (lexer);
155 if (!lex_force_match (lexer, T_RPAREN))
158 else if (match_macro_id (lexer, "!CHAREND"))
160 p->arg_type = ARG_CHAREND;
161 p->charend = (struct token) { .type = T_STOP };
163 if (!lex_force_match (lexer, T_LPAREN)
164 || !parse_quoted_token (lexer, &p->charend)
165 || !lex_force_match (lexer, T_RPAREN))
168 else if (match_macro_id (lexer, "!ENCLOSE"))
170 p->arg_type = ARG_ENCLOSE;
171 p->enclose[0] = p->enclose[1] = (struct token) { .type = T_STOP };
173 if (!lex_force_match (lexer, T_LPAREN)
174 || !parse_quoted_token (lexer, &p->enclose[0])
175 || !lex_force_match (lexer, T_COMMA)
176 || !parse_quoted_token (lexer, &p->enclose[1])
177 || !lex_force_match (lexer, T_RPAREN))
180 else if (match_macro_id (lexer, "!CMDEND"))
181 p->arg_type = ARG_CMDEND;
184 lex_error_expecting (lexer, "!TOKENS", "!CHAREND",
185 "!ENCLOSE", "!CMDEND");
189 if (lex_token (lexer) != T_RPAREN && !lex_force_match (lexer, T_SLASH))
193 struct string body = DS_EMPTY_INITIALIZER;
194 while (!match_macro_id (lexer, "!ENDDEFINE"))
196 if (lex_token (lexer) != T_STRING)
198 lex_error (lexer, _("Expecting macro body or !ENDDEFINE"));
203 ds_put_substring (&body, lex_tokss (lexer));
204 ds_put_byte (&body, '\n');
207 m->body = ds_ss (&body);
209 lex_define_macro (lexer, m);