1 /** @file ginsh_lexer.ll
3 * Lexical analyzer definition for ginsh.
4 * This file must be processed with flex. */
7 * GiNaC Copyright (C) 1999-2000 Johannes Gutenberg University Mainz, Germany
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
33 #include "ginsh_parser.h"
35 #define YY_INPUT(buf, result, max_size) (result = ginsh_input(buf, max_size))
37 // Table of all used symbols
41 static int ginsh_input(char *buf, int max_size);
56 [ \t\n]+ /* skip whitespace */
57 \\$ /* skip line continuations */
58 "//".* /* skip comments starting with "//" */
59 ^"!".* system(yytext + 1); /* execute shell command */
62 Pi yylval = Pi; return T_LITERAL;
63 Euler yylval = Euler; return T_LITERAL;
64 Catalan yylval = Catalan; return T_LITERAL;
65 FAIL yylval = *new fail(); return T_LITERAL;
66 I yylval = I; return T_NUMBER;
67 Digits yylval = (long)Digits; return T_DIGITS;
70 quit|exit return T_QUIT;
71 warranty return T_WARRANTY;
73 iprint return T_IPRINT;
76 inventory return T_INVENTORY;
84 ">=" return T_GREATEREQ;
86 /* last 1..3 expressions */
89 \"\"\" return T_QUOTE3;
91 /* matrix delimiters */
92 \[\[ return T_MATRIX_BEGIN;
93 \]\] return T_MATRIX_END;
103 {D}+{E} yylval = numeric(yytext); return T_NUMBER;
107 sym_tab::const_iterator i = syms.find(yytext);
108 if (i == syms.end()) {
109 yylval = syms[yytext] = *(new symbol(yytext));
115 /* everything else */
125 static int line_length = 0;
126 static char *line_read = NULL;
127 static char *line_ptr;
129 // Input function that uses libreadline for interactive input
130 static int ginsh_input(char *buf, int max_size)
133 if (yy_current_buffer->yy_is_interactive) {
134 #ifdef HAVE_LIBREADLINE
135 // Do we need to read a new line?
137 if (line_length == 0) {
143 // Read new line, prompt "> "
144 line_read = line_ptr = readline("> ");
152 // Add non-empty lines to history
153 line_length = strlen(line_read) + 1;
155 add_history(line_read);
157 // Reappend trailing '\n' which is stripped by readline()
158 line_read[line_length - 1] = '\n';
161 // Copy data to lex buffer
162 actual = line_length > max_size ? max_size : line_length;
163 memcpy(buf, line_ptr, actual);
164 line_length -= actual;
168 printf("> "); fflush(stdout);
170 for (n = 0; n < max_size && (c = getc(yyin)) != EOF && c != '\n'; ++n)
174 if (c == EOF && ferror(yyin))
175 YY_FATAL_ERROR("input in flex scanner failed");
178 } else if (((result = fread(buf, 1, max_size, yyin)) == 0) && ferror(yyin))
179 YY_FATAL_ERROR("input in flex scanner failed");
184 // List of input files to be processed
186 char **file_list = NULL;
188 // EOF encountered, connect to next file. If this was the last file,
189 // connect to stdin. If this was stdin, terminate the scanner.
197 yyin = fopen(*file_list, "r");
199 cerr << "Can't open " << *file_list << endl;