modified example programs, added strings to lexer

git-svn-id: svn://anubis/jtlc/trunk@6 f5bc74b8-7b62-4e90-9214-7121d538519f

parser/parser.lex

@@ -5,9 +5,14 @@
 %{
 
 #include "parser.tab.hh"
+#include <string>
+using namespace std;
+static string build_string;
 
 %}
 
+%x str
+
 %%
 
     /* operators */
@@ -66,6 +71,8 @@ int         return INT;
 uint        return UINT;
 long        return LONG;
 ulong       return ULONG;
+float       return FLOAT;
+double      return DOUBLE;
 
     /* keywords */
 import      return IMPORT;
@@ -76,6 +83,31 @@ struct      return STRUCT;
     /* identifiers */
 [a-zA-Z_][a-zA-Z_0-9]* {
             return IDENTIFIER;
+}
+
+    /* strings */
+\"          build_string = ""; BEGIN(str);
+<str>{
+
+\" {
+            /* end of the string literal */
+            BEGIN(INITIAL);
+            return STRING_LITERAL;
+}
+\\x[0-9A-Fa-f]{2} {
+            /* hexadecimal escape code */
+            unsigned int val;
+            (void) sscanf(yytext + 2, "%x", &val);
+            build_string += (char) val;
+}
+\\n         build_string += '\n';
+\\t         build_string += '\t';
+\\r         build_string += '\r';
+\\b         build_string += '\b';
+\\f         build_string += '\f';
+\\(.|\n)    build_string += yytext[1];
+[^\\\"]+    build_string += yytext;
+
 }
 
     /* whitespace */

parser/parser.yy

@@ -59,6 +59,7 @@ int yywrap()
     /* literals */
 %token INT_LITERAL;
 %token REAL_LITERAL;
+%token STRING_LITERAL;
 
     /* primitive types */
 %token BYTE;
@@ -71,6 +72,8 @@ int yywrap()
 %token UINT;
 %token LONG;
 %token ULONG;
+%token FLOAT;
+%token DOUBLE;
 
     /* keywords */
 %token IMPORT;