/** @file ginsh_lexer.ll
*
* Lexical analyzer definition for ginsh.
- * This file must be processed with flex.
- *
- * GiNaC Copyright (C) 1999 Johannes Gutenberg University Mainz, Germany
+ * This file must be processed with flex. */
+
+/*
+ * GiNaC Copyright (C) 1999-2001 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
%{
#include "config.h"
-#include <stdio.h>
-extern "C" {
-#include <readline/readline.h>
-#include <readline/history.h>
-}
-#include <map>
-
-#include <ginac/ginac.h>
#include "ginsh.h"
-
#include "ginsh_parser.h"
#define YY_INPUT(buf, result, max_size) (result = ginsh_input(buf, max_size))
%%
[ \t\n]+ /* skip whitespace */
\\$ /* skip line continuations */
-"#".* /* skip comments starting with "#" */
+"//".* /* skip comments starting with "//" */
+^"#".* /* skip lines starting with "#" */
^"!".* system(yytext + 1); /* execute shell command */
/* special values */
Pi yylval = Pi; return T_LITERAL;
-EulerGamma yylval = EulerGamma; 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;
/* keywords */
quit|exit return T_QUIT;
+warranty return T_WARRANTY;
print return T_PRINT;
+iprint return T_IPRINT;
time return T_TIME;
xyzzy return T_XYZZY;
inventory return T_INVENTORY;
/* 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}* {
- if (syms.find(yytext) == syms.end())
- syms[yytext] = *(new symbol(yytext));
- yylval = syms[yytext];
+ sym_tab::const_iterator i = syms.find(yytext);
+ if (i == syms.end()) {
+ yylval = syms[yytext] = *(new symbol(yytext));
+ } else
+ yylval = i->second;
return T_SYMBOL;
}
{
int result;
if (yy_current_buffer->yy_is_interactive) {
- int actual;
-
+#ifdef HAVE_LIBREADLINE
// Do we need to read a new line?
+ int actual;
if (line_length == 0) {
// Free old line
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;
}
-// Scanner terminates on EOF
+// 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()
{
- return 1;
+ 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;
}