1 /** @file ginsh_lexer.lpp
3 * Lexical analyzer definition for ginsh.
4 * This file must be processed with flex. */
7 * GiNaC Copyright (C) 1999-2020 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
39 #include "ginsh_parser.hpp"
41 #define YY_INPUT(buf, result, max_size) (result = ginsh_input(buf, max_size))
43 // Table of all used symbols
46 // Type of symbols to generate (real or complex)
47 unsigned symboltype = domain::complex;
50 static int ginsh_input(char *buf, int max_size);
65 [ \t\n]+ /* skip whitespace */
66 \\$ /* skip line continuations */
67 "//".* /* skip comments starting with "//" */
68 ^"#".* /* skip lines starting with "#" */
69 ^"!".* system(yytext + 1); /* execute shell command */
72 Pi yylval = Pi; return T_LITERAL;
73 Euler yylval = Euler; return T_LITERAL;
74 Catalan yylval = Catalan; return T_LITERAL;
75 FAIL yylval = *new fail(); return T_LITERAL;
76 I yylval = I; return T_NUMBER;
77 Digits yylval = (long)Digits; return T_DIGITS;
80 quit|exit return T_QUIT;
81 warranty return T_WARRANTY;
83 iprint return T_IPRINT;
84 print_latex return T_PRINTLATEX;
85 print_csrc return T_PRINTCSRC;
88 inventory return T_INVENTORY;
91 complex_symbols return T_COMPLEX_SYMBOLS;
92 real_symbols return T_REAL_SYMBOLS;
98 ">=" return T_GREATEREQ;
100 /* last 1..3 expressions */
102 \%\% return T_QUOTE2;
103 \%\%\% return T_QUOTE3;
113 {D}+{E} yylval = numeric(yytext); return T_NUMBER;
117 sym_tab::const_iterator i = syms.find(yytext);
118 if (i == syms.end()) {
119 if (symboltype == domain::complex) {
124 realsymbol tmp(yytext);
134 \${D}+ yylval = wild(atoi(yytext + 1)); return T_LITERAL;
136 /* everything else */
146 static int line_length = 0;
147 static char *line_read = nullptr;
148 static char *line_ptr;
150 // Input function that uses libreadline for interactive input
151 static int ginsh_input(char *buf, int max_size)
154 #if defined(YY_CURRENT_BUFFER)
155 if (YY_CURRENT_BUFFER->yy_is_interactive) {
157 if (yy_current_buffer->yy_is_interactive) {
159 #ifdef HAVE_LIBREADLINE
160 // Do we need to read a new line?
162 if (line_length == 0) {
168 // Read new line, prompt "> "
169 line_read = line_ptr = readline("> ");
177 // Add non-empty lines to history
178 line_length = strlen(line_read) + 1;
180 add_history(line_read);
182 // Reappend trailing '\n' which is stripped by readline()
183 line_read[line_length - 1] = '\n';
186 // Copy data to lex buffer
187 actual = line_length > max_size ? max_size : line_length;
188 memcpy(buf, line_ptr, actual);
189 line_length -= actual;
193 printf("> "); fflush(stdout);
195 for (n = 0; n < max_size && (c = getc(yyin)) != EOF && c != '\n'; ++n)
199 if (c == EOF && ferror(yyin))
200 YY_FATAL_ERROR("input in flex scanner failed");
203 } else if (((result = fread(buf, 1, max_size, yyin)) == 0) && ferror(yyin))
204 YY_FATAL_ERROR("input in flex scanner failed");
209 // List of input files to be processed
211 char **file_list = nullptr;
213 // EOF encountered, connect to next file. If this was the last file,
214 // connect to stdin. If this was stdin, terminate the scanner.
222 yyin = fopen(*file_list, "r");
223 if (yyin == nullptr) {
224 cerr << "Can't open " << *file_list << endl;