+++ /dev/null
-/** @file ginsh_lexer.ll
- *
- * Lexical analyzer definition for ginsh.
- * This file must be processed with flex. */
-
-/*
- * GiNaC Copyright (C) 1999-2011 Johannes Gutenberg University Mainz, Germany
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-
-/*
- * Definitions
- */
-
-%pointer
-
-%{
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include "ginsh.h"
-#include "ginsh_parser.h"
-
-#define YY_INPUT(buf, result, max_size) (result = ginsh_input(buf, max_size))
-
-// Table of all used symbols
-sym_tab syms;
-
-// Type of symbols to generate (real or complex)
-unsigned symboltype = domain::complex;
-
-// lex input function
-static int ginsh_input(char *buf, int max_size);
-%}
-
- /* Abbreviations */
-D [0-9]
-E [elEL][-+]?{D}+
-A [a-zA-Z_]
-AN [0-9a-zA-Z_]
-
-
-/*
- * Lexical rules
- */
-
-%%
-[ \t\n]+ /* skip whitespace */
-\\$ /* skip line continuations */
-"//".* /* skip comments starting with "//" */
-^"#".* /* skip lines starting with "#" */
-^"!".* system(yytext + 1); /* execute shell command */
-
- /* special values */
-Pi yylval = Pi; return T_LITERAL;
-Euler yylval = Euler; return T_LITERAL;
-Catalan yylval = Catalan; return T_LITERAL;
-FAIL yylval = *new fail(); return T_LITERAL;
-I yylval = I; return T_NUMBER;
-Digits yylval = (long)Digits; return T_DIGITS;
-
- /* keywords */
-quit|exit return T_QUIT;
-warranty return T_WARRANTY;
-print return T_PRINT;
-iprint return T_IPRINT;
-print_latex return T_PRINTLATEX;
-print_csrc return T_PRINTCSRC;
-time return T_TIME;
-xyzzy return T_XYZZY;
-inventory return T_INVENTORY;
-look return T_LOOK;
-score return T_SCORE;
-complex_symbols return T_COMPLEX_SYMBOLS;
-real_symbols return T_REAL_SYMBOLS;
-
- /* comparison */
-"==" return T_EQUAL;
-"!=" return T_NOTEQ;
-"<=" return T_LESSEQ;
-">=" return T_GREATEREQ;
-
- /* last 1..3 expressions */
-\% return T_QUOTE;
-\%\% return T_QUOTE2;
-\%\%\% return T_QUOTE3;
-
- /* numbers */
-{D}+ |
-"#"{D}+"R"{AN}+ |
-"#b"([01])+ |
-"#o"[0-7]+ |
-"#x"[0-9a-fA-F]+ |
-{D}+"."{D}*({E})? |
-{D}*"."{D}+({E})? |
-{D}+{E} yylval = numeric(yytext); return T_NUMBER;
-
- /* symbols */
-{A}{AN}* {
- sym_tab::const_iterator i = syms.find(yytext);
- if (i == syms.end()) {
- if (symboltype == domain::complex) {
- symbol tmp(yytext);
- syms[yytext] = tmp;
- yylval = tmp;
- } else {
- realsymbol tmp(yytext);
- syms[yytext] = tmp;
- yylval = tmp;
- }
- } else
- yylval = i->second;
- return T_SYMBOL;
- }
-
- /* wildcards */
-\${D}+ yylval = wild(atoi(yytext + 1)); return T_LITERAL;
-
- /* everything else */
-. return *yytext;
-
-%%
-
-
-/*
- * Routines
- */
-
-static int line_length = 0;
-static char *line_read = NULL;
-static char *line_ptr;
-
-// Input function that uses libreadline for interactive input
-static int ginsh_input(char *buf, int max_size)
-{
- int result;
-#if defined(YY_CURRENT_BUFFER)
- if (YY_CURRENT_BUFFER->yy_is_interactive) {
-#else
- if (yy_current_buffer->yy_is_interactive) {
-#endif
-#ifdef HAVE_LIBREADLINE
- // Do we need to read a new line?
- int actual;
- if (line_length == 0) {
-
- // Free old line
- if (line_read)
- free(line_read);
-
- // Read new line, prompt "> "
- line_read = line_ptr = readline("> ");
-
- // EOF?
- if (!line_read) {
- line_length = 0;
- return YY_NULL;
- }
-
- // Add non-empty lines to history
- line_length = strlen(line_read) + 1;
- if (line_length > 1)
- add_history(line_read);
-
- // Reappend trailing '\n' which is stripped by readline()
- line_read[line_length - 1] = '\n';
- }
-
- // Copy data to lex buffer
- actual = line_length > max_size ? max_size : line_length;
- memcpy(buf, line_ptr, actual);
- line_length -= actual;
- line_ptr += actual;
- result = actual;
-#else
- printf("> "); fflush(stdout);
- int c = '*', n;
- for (n = 0; n < max_size && (c = getc(yyin)) != EOF && c != '\n'; ++n)
- buf[n] = (char)c;
- if (c == '\n')
- buf[n++] = (char)c;
- if (c == EOF && ferror(yyin))
- YY_FATAL_ERROR("input in flex scanner failed");
- result = n;
-#endif
- } else if (((result = fread(buf, 1, max_size, yyin)) == 0) && ferror(yyin))
- YY_FATAL_ERROR("input in flex scanner failed");
-
- return result;
-}
-
-// List of input files to be processed
-int num_files = 0;
-char **file_list = NULL;
-
-// EOF encountered, connect to next file. If this was the last file,
-// connect to stdin. If this was stdin, terminate the scanner.
-int yywrap()
-{
- if (yyin == stdin)
- return 1;
-
- fclose(yyin);
- if (num_files) {
- yyin = fopen(*file_list, "r");
- if (yyin == NULL) {
- cerr << "Can't open " << *file_list << endl;
- return 1;
- }
- num_files--;
- file_list++;
- } else
- yyin = stdin;
- return 0;
-}
git://www.ginac.de / ginac.git / blobdiff