1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000, 2010, 2011, 2013, 2014 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/>. */
24 #include "data/identifier.h"
25 #include "data/variable.h"
26 #include "libpspp/compiler.h"
27 #include "libpspp/prompt.h"
31 /* The syntax mode for which a syntax file is intended. */
34 LEX_SYNTAX_AUTO, /* Try to guess intent. */
35 LEX_SYNTAX_INTERACTIVE, /* Interactive mode. */
36 LEX_SYNTAX_BATCH /* Batch mode. */
39 /* Handling of errors. */
42 LEX_ERROR_TERMINAL, /* Discard input line and continue reading. */
43 LEX_ERROR_CONTINUE, /* Continue to next command, except for
44 cascading failures. */
45 LEX_ERROR_STOP /* Stop processing. */
48 /* Reads a single syntax file as a stream of bytes encoded in UTF-8.
53 const struct lex_reader_class *class;
54 enum lex_syntax_mode syntax;
55 enum lex_error_mode error;
57 char *file_name; /* NULL if not associated with a file. */
58 int line_number; /* 1-based initial line number, 0 if none. */
61 /* An implementation of a lex_reader. */
62 struct lex_reader_class
64 /* Reads up to N bytes of data from READER into N. Returns the positive
65 number of bytes read if successful, or zero at end of input or on
68 STYLE provides a hint to interactive readers as to what kind of syntax
69 is being read right now. */
70 size_t (*read) (struct lex_reader *reader, char *buf, size_t n,
71 enum prompt_style style);
73 /* Closes and destroys READER, releasing any allocated storage.
75 The caller will free the 'file_name' member of READER, so the
76 implementation should not do so. */
77 void (*destroy) (struct lex_reader *reader);
80 /* Helper functions for lex_reader. */
81 void lex_reader_init (struct lex_reader *, const struct lex_reader_class *);
82 void lex_reader_set_file_name (struct lex_reader *, const char *file_name);
84 /* Creating various kinds of lex_readers. */
85 struct lex_reader *lex_reader_for_file (const char *file_name,
87 enum lex_syntax_mode syntax,
88 enum lex_error_mode error);
89 struct lex_reader *lex_reader_for_string (const char *, const char *encoding);
90 struct lex_reader *lex_reader_for_format (const char *, const char *, ...)
92 struct lex_reader *lex_reader_for_substring_nocopy (struct substring, const char *encoding);
95 struct lexer *lex_create (void);
96 void lex_destroy (struct lexer *);
99 void lex_include (struct lexer *, struct lex_reader *);
100 void lex_append (struct lexer *, struct lex_reader *);
103 void lex_get (struct lexer *);
105 /* Token testing functions. */
106 bool lex_is_number (struct lexer *);
107 double lex_number (struct lexer *);
108 bool lex_is_integer (struct lexer *);
109 long lex_integer (struct lexer *);
110 bool lex_is_string (struct lexer *);
112 /* Token testing functions with lookahead. */
113 bool lex_next_is_number (struct lexer *, int n);
114 double lex_next_number (struct lexer *, int n);
115 bool lex_next_is_integer (struct lexer *, int n);
116 long lex_next_integer (struct lexer *, int n);
117 bool lex_next_is_string (struct lexer *, int n);
119 /* Token matching functions. */
120 bool lex_match (struct lexer *, enum token_type);
121 bool lex_match_id (struct lexer *, const char *);
122 bool lex_match_id_n (struct lexer *, const char *, size_t n);
123 bool lex_match_int (struct lexer *, int);
124 bool lex_match_phrase (struct lexer *, const char *s);
126 /* Forcible matching functions. */
127 bool lex_force_match (struct lexer *, enum token_type);
128 bool lex_force_match_id (struct lexer *, const char *);
129 bool lex_force_int (struct lexer *);
130 bool lex_force_num (struct lexer *);
131 bool lex_force_id (struct lexer *);
132 bool lex_force_string (struct lexer *);
133 bool lex_force_string_or_id (struct lexer *);
135 /* Token accessors. */
136 enum token_type lex_token (const struct lexer *);
137 double lex_tokval (const struct lexer *);
138 const char *lex_tokcstr (const struct lexer *);
139 struct substring lex_tokss (const struct lexer *);
142 const struct token *lex_next (const struct lexer *, int n);
143 enum token_type lex_next_token (const struct lexer *, int n);
144 const char *lex_next_tokcstr (const struct lexer *, int n);
145 double lex_next_tokval (const struct lexer *, int n);
146 struct substring lex_next_tokss (const struct lexer *, int n);
148 /* Current position. */
149 int lex_get_first_line_number (const struct lexer *, int n);
150 int lex_get_last_line_number (const struct lexer *, int n);
151 int lex_get_first_column (const struct lexer *, int n);
152 int lex_get_last_column (const struct lexer *, int n);
153 const char *lex_get_file_name (const struct lexer *);
154 const char *lex_get_encoding (const struct lexer *);
156 /* Issuing errors. */
157 void lex_error (struct lexer *, const char *, ...) PRINTF_FORMAT (2, 3);
158 void lex_next_error (struct lexer *, int n0, int n1, const char *, ...)
159 PRINTF_FORMAT (4, 5);
160 int lex_end_of_command (struct lexer *);
162 void lex_error_expecting (struct lexer *, const char *, ...) SENTINEL(0);
164 void lex_sbc_only_once (const char *);
165 void lex_sbc_missing (const char *);
167 void lex_spec_only_once (struct lexer *, const char *subcommand,
168 const char *specification);
169 void lex_spec_missing (struct lexer *, const char *subcommand,
170 const char *specification);
172 void lex_error_valist (struct lexer *, const char *, va_list)
173 PRINTF_FORMAT (2, 0);
174 void lex_next_error_valist (struct lexer *lexer, int n0, int n1,
175 const char *format, va_list)
176 PRINTF_FORMAT (4, 0);
178 /* Error handling. */
179 enum lex_syntax_mode lex_get_syntax_mode (const struct lexer *);
180 enum lex_error_mode lex_get_error_mode (const struct lexer *);
181 void lex_discard_rest_of_command (struct lexer *);
182 void lex_interactive_reset (struct lexer *);
183 void lex_discard_noninteractive (struct lexer *);