1 /** @file ginsh_lexer.ll
3 * Lexical analyzer definition for ginsh.
4 * This file must be processed with flex. */
7 * GiNaC Copyright (C) 1999-2003 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;
75 print_latex return T_PRINTLATEX;
76 print_csrc return T_PRINTCSRC;
79 inventory return T_INVENTORY;
87 ">=" return T_GREATEREQ;
89 /* last 1..3 expressions */
92 \%\%\% return T_QUOTE3;
102 {D}+{E} yylval = numeric(yytext); return T_NUMBER;
106 sym_tab::const_iterator i = syms.find(yytext);
107 if (i == syms.end()) {
108 yylval = syms[yytext] = *(new symbol(yytext));
115 \${D}+ yylval = wild(atoi(yytext + 1)); return T_LITERAL;
117 /* everything else */
127 static int line_length = 0;
128 static char *line_read = NULL;
129 static char *line_ptr;
131 // Input function that uses libreadline for interactive input
132 static int ginsh_input(char *buf, int max_size)
135 #if defined(YY_CURRENT_BUFFER)
136 if (YY_CURRENT_BUFFER->yy_is_interactive) {
138 if (yy_current_buffer->yy_is_interactive) {
140 #ifdef HAVE_LIBREADLINE
141 // Do we need to read a new line?
143 if (line_length == 0) {
149 // Read new line, prompt "> "
150 line_read = line_ptr = readline("> ");
158 // Add non-empty lines to history
159 line_length = strlen(line_read) + 1;
161 add_history(line_read);
163 // Reappend trailing '\n' which is stripped by readline()
164 line_read[line_length - 1] = '\n';
167 // Copy data to lex buffer
168 actual = line_length > max_size ? max_size : line_length;
169 memcpy(buf, line_ptr, actual);
170 line_length -= actual;
174 printf("> "); fflush(stdout);
176 for (n = 0; n < max_size && (c = getc(yyin)) != EOF && c != '\n'; ++n)
180 if (c == EOF && ferror(yyin))
181 YY_FATAL_ERROR("input in flex scanner failed");
184 } else if (((result = fread(buf, 1, max_size, yyin)) == 0) && ferror(yyin))
185 YY_FATAL_ERROR("input in flex scanner failed");
190 // List of input files to be processed
192 char **file_list = NULL;
194 // EOF encountered, connect to next file. If this was the last file,
195 // connect to stdin. If this was stdin, terminate the scanner.
203 yyin = fopen(*file_list, "r");
205 cerr << "Can't open " << *file_list << endl;