Reorganizing the code

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

src/util/smt2_util.cpp

@@ -0,0 +1,62 @@
+/*++
+Copyright (c) 2011 Microsoft Corporation
+
+Module Name:
+
+    smt2_util.cpp
+
+Abstract:
+
+    Goodies for SMT2 standard
+
+Author:
+
+    Leonardo (leonardo) 2012-10-20
+
+Notes:
+
+--*/
+#include"smt2_util.h"
+
+bool is_smt2_simple_symbol_char(char s) {
+    return 
+        ('0' <= s && s <= '9') ||
+        ('a' <= s && s <= 'z') ||
+        ('A' <= s && s <= 'Z') ||
+        s == '~' || s == '!' || s == '@' || s == '$' || s == '%' || s == '^' || s == '&' ||
+        s == '*' || s == '_' || s == '-' || s == '+' || s == '=' || s == '<' || s == '>' ||
+        s == '.' || s == '?' || s == '/';
+}
+
+bool is_smt2_quoted_symbol(char const * s) {
+    if (s == 0)
+        return false;
+    if ('0' <= s[0] && s[0] <= '9')
+        return true;
+    unsigned len = static_cast<unsigned>(strlen(s));
+    for (unsigned i = 0; i < len; i++)
+        if (!is_smt2_simple_symbol_char(s[i]))
+            return true;
+    return false;
+}
+
+bool is_smt2_quoted_symbol(symbol const & s) {
+    if (s.is_numerical())
+        return false;
+    return is_smt2_quoted_symbol(s.bare_str());
+}
+
+std::string mk_smt2_quoted_symbol(symbol const & s) {
+    SASSERT(is_smt2_quoted_symbol(s));
+    string_buffer<> buffer;
+    buffer.append('|');
+    char const * str = s.bare_str();
+    while (*str) {
+        if (*str == '|' || *str == '\\')
+            buffer.append('\\');
+        buffer.append(*str);
+        str++;
+    }
+    buffer.append('|');
+    return std::string(buffer.c_str());
+}