1 /** @file ginsh_lexer.lpp
3 * Lexical analyzer definition for ginsh.
4 * This file must be processed with flex. */
7 * GiNaC Copyright (C) 1999-2014 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
37 #include "ginsh_parser.hpp"
39 #define YY_INPUT(buf, result, max_size) (result = ginsh_input(buf, max_size))
41 // Table of all used symbols
44 // Type of symbols to generate (real or complex)
45 unsigned symboltype = domain::complex;
48 static int ginsh_input(char *buf, int max_size);
63 [ \t\n]+ /* skip whitespace */
64 \\$ /* skip line continuations */
65 "//".* /* skip comments starting with "//" */
66 ^"#".* /* skip lines starting with "#" */
67 ^"!".* system(yytext + 1); /* execute shell command */
70 Pi yylval = Pi; return T_LITERAL;
71 Euler yylval = Euler; return T_LITERAL;
72 Catalan yylval = Catalan; return T_LITERAL;
73 FAIL yylval = *new fail(); return T_LITERAL;
74 I yylval = I; return T_NUMBER;
75 Digits yylval = (long)Digits; return T_DIGITS;
78 quit|exit return T_QUIT;
79 warranty return T_WARRANTY;
81 iprint return T_IPRINT;
82 print_latex return T_PRINTLATEX;
83 print_csrc return T_PRINTCSRC;
86 inventory return T_INVENTORY;
89 complex_symbols return T_COMPLEX_SYMBOLS;
90 real_symbols return T_REAL_SYMBOLS;
96 ">=" return T_GREATEREQ;
98 /* last 1..3 expressions */
100 \%\% return T_QUOTE2;
101 \%\%\% return T_QUOTE3;
111 {D}+{E} yylval = numeric(yytext); return T_NUMBER;
115 sym_tab::const_iterator i = syms.find(yytext);
116 if (i == syms.end()) {
117 if (symboltype == domain::complex) {
122 realsymbol tmp(yytext);
132 \${D}+ yylval = wild(atoi(yytext + 1)); return T_LITERAL;
134 /* everything else */
144 static int line_length = 0;
145 static char *line_read = NULL;
146 static char *line_ptr;
148 // Input function that uses libreadline for interactive input
149 static int ginsh_input(char *buf, int max_size)
152 #if defined(YY_CURRENT_BUFFER)
153 if (YY_CURRENT_BUFFER->yy_is_interactive) {
155 if (yy_current_buffer->yy_is_interactive) {
157 #ifdef HAVE_LIBREADLINE
158 // Do we need to read a new line?
160 if (line_length == 0) {
166 // Read new line, prompt "> "
167 line_read = line_ptr = readline("> ");
175 // Add non-empty lines to history
176 line_length = strlen(line_read) + 1;
178 add_history(line_read);
180 // Reappend trailing '\n' which is stripped by readline()
181 line_read[line_length - 1] = '\n';
184 // Copy data to lex buffer
185 actual = line_length > max_size ? max_size : line_length;
186 memcpy(buf, line_ptr, actual);
187 line_length -= actual;
191 printf("> "); fflush(stdout);
193 for (n = 0; n < max_size && (c = getc(yyin)) != EOF && c != '\n'; ++n)
197 if (c == EOF && ferror(yyin))
198 YY_FATAL_ERROR("input in flex scanner failed");
201 } else if (((result = fread(buf, 1, max_size, yyin)) == 0) && ferror(yyin))
202 YY_FATAL_ERROR("input in flex scanner failed");
207 // List of input files to be processed
209 char **file_list = NULL;
211 // EOF encountered, connect to next file. If this was the last file,
212 // connect to stdin. If this was stdin, terminate the scanner.
220 yyin = fopen(*file_list, "r");
222 cerr << "Can't open " << *file_list << endl;