Imported gcc-4.4.3

[msp430-gcc.git] / gmp / demos / calc / calclex.l

diff --git a/gmp/demos/calc/calclex.l b/gmp/demos/calc/calclex.l
new file mode 100644 (file)
index 0000000..32d4fc2
--- /dev/null
+++ b/gmp/demos/calc/calclex.l
@@ -0,0 +1,113 @@
+/* Lexical analyzer for calc program.
+
+Copyright 2000, 2001, 2002 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+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 3 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, see http://www.gnu.org/licenses/.  */
+
+%{
+#include <string.h>
+#include "calc-common.h"
+
+
+#if WITH_READLINE
+/* Let GNU flex use readline.  See the calcread.c redefined input() for a
+   way that might work for a standard lex too.  */
+#define YY_INPUT(buf,result,max_size)   \
+  result = calc_input (buf, max_size);
+#endif
+
+
+/* Non-zero when reading the second or subsequent line of an expression,
+   used to give a different prompt when using readline.  */
+int  calc_more_input = 0;
+
+
+const struct calc_keywords_t  calc_keywords[] = {
+  { "abs",       ABS },
+  { "bin",       BIN },
+  { "decimal",   DECIMAL },
+  { "fib",       FIB },
+  { "hex",       HEX },
+  { "help",      HELP },
+  { "gcd",       GCD },
+  { "kron",      KRON },
+  { "lcm",       LCM },
+  { "lucnum",    LUCNUM },
+  { "nextprime", NEXTPRIME },
+  { "powm",      POWM },
+  { "quit",      QUIT },
+  { "root",      ROOT },
+  { "sqrt",      SQRT },
+  { NULL }
+};
+%}
+
+%%
+
+[ \t\f] { /* white space is skipped */ }
+
+[;\n]   { /* semicolon or newline separates statements */
+          calc_more_input = 0;
+          return EOS; }
+\\\n    { /* escaped newlines are skipped */ }
+
+
+#(([^\\\n]*)\\)+\n {
+            /* comment through to escaped newline is skipped */ }
+#[^\n]*\n { /* comment through to newline is a separator */
+            calc_more_input = 0;
+            return EOS; }
+#[^\n]* {   /* comment through to EOF skipped */ }
+
+
+[-+*/%()<>^!=,] { return yytext[0]; }
+"<="    { return LE; }
+">="    { return GE; }
+"=="    { return EQ; }
+"!="    { return NE; }
+"<<"    { return LSHIFT; }
+">>"    { return RSHIFT; }
+"&&"    { return LAND; }
+"||"    { return LOR; }
+
+(0[xX])?[0-9A-F]+ {
+        yylval.str = yytext;
+        return NUMBER; }
+
+[a-zA-Z][a-zA-Z0-9]* {
+        int  i;
+
+        for (i = 0; calc_keywords[i].name != NULL; i++)
+          if (strcmp (yytext, calc_keywords[i].name) == 0)
+            return calc_keywords[i].value;
+
+        if (yytext[0] >= 'a' && yytext[0] <= 'z' && yytext[1] == '\0')
+          {
+            yylval.var = yytext[0] - 'a';
+            return VARIABLE;
+          }
+
+        return BAD;
+}
+
+. { return BAD; }
+
+%%
+
+int
+yywrap ()
+{
+  return 1;
+}