1 /** @file ginsh_lexer.ll
3 * Lexical analyzer definition for ginsh.
4 * This file must be processed with flex. */
7 * GiNaC Copyright (C) 1999-2001 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 ^"#".* /* skip lines starting with "#" */
60 ^"!".* system(yytext + 1); /* execute shell command */
63 Pi yylval = Pi; return T_LITERAL;
64 Euler yylval = Euler; return T_LITERAL;
65 Catalan yylval = Catalan; return T_LITERAL;
66 FAIL yylval = *new fail(); return T_LITERAL;
67 I yylval = I; return T_NUMBER;
68 Digits yylval = (long)Digits; return T_DIGITS;
71 quit|exit return T_QUIT;
72 warranty return T_WARRANTY;
74 iprint return T_IPRINT;
77 inventory return T_INVENTORY;
85 ">=" return T_GREATEREQ;
87 /* last 1..3 expressions */
90 \"\"\" return T_QUOTE3;
92 /* matrix delimiters */
93 \[\[ return T_MATRIX_BEGIN;
94 \]\] return T_MATRIX_END;
104 {D}+{E} yylval = numeric(yytext); return T_NUMBER;
108 sym_tab::const_iterator i = syms.find(yytext);
109 if (i == syms.end()) {
110 yylval = syms[yytext] = *(new symbol(yytext));
117 \${D}+ yylval = wild(atoi(yytext + 1)); return T_LITERAL;
119 /* everything else */
129 static int line_length = 0;
130 static char *line_read = NULL;
131 static char *line_ptr;
133 // Input function that uses libreadline for interactive input
134 static int ginsh_input(char *buf, int max_size)
137 if (yy_current_buffer->yy_is_interactive) {
138 #ifdef HAVE_LIBREADLINE
139 // Do we need to read a new line?
141 if (line_length == 0) {
147 // Read new line, prompt "> "
148 line_read = line_ptr = readline("> ");
156 // Add non-empty lines to history
157 line_length = strlen(line_read) + 1;
159 add_history(line_read);
161 // Reappend trailing '\n' which is stripped by readline()
162 line_read[line_length - 1] = '\n';
165 // Copy data to lex buffer
166 actual = line_length > max_size ? max_size : line_length;
167 memcpy(buf, line_ptr, actual);
168 line_length -= actual;
172 printf("> "); fflush(stdout);
174 for (n = 0; n < max_size && (c = getc(yyin)) != EOF && c != '\n'; ++n)
178 if (c == EOF && ferror(yyin))
179 YY_FATAL_ERROR("input in flex scanner failed");
182 } else if (((result = fread(buf, 1, max_size, yyin)) == 0) && ferror(yyin))
183 YY_FATAL_ERROR("input in flex scanner failed");
188 // List of input files to be processed
190 char **file_list = NULL;
192 // EOF encountered, connect to next file. If this was the last file,
193 // connect to stdin. If this was stdin, terminate the scanner.
201 yyin = fopen(*file_list, "r");
203 cerr << "Can't open " << *file_list << endl;