epee: speedup word/number matching

Number matching semantics are slightly changed: since this is used
as a filter to check whether a number is signed and/or floating
point, we can speed this up further. strto* functions are called
afterwards and will error out where necessary. We now also accept
numbers like .4 which were not accepted before.

The strto* calls on a boost::string_ref will not access unallocated
memory since the parsers always stop at the first bad character,
and the original string is zero terminated.

in arbitrary time measurement units for some arbitrary test case:

match_number2: 235 -> 70
match_word2: 330 -> 108

tests/unit_tests/epee_utils.cpp

@@ -50,6 +50,7 @@
 #include "p2p/net_peerlist_boost_serialization.h"
 #include "span.h"
 #include "string_tools.h"
+#include "storages/parserse_base_utils.h"
 
 namespace
 {
@@ -833,3 +834,86 @@ TEST(net_buffer, move)
   ASSERT_TRUE(!memcmp(span.data() + 1, std::string(4000, '0').c_str(), 4000));
 }
 
+TEST(parsing, isspace)
+{
+  ASSERT_FALSE(epee::misc_utils::parse::isspace(0));
+  for (int c = 1; c < 256; ++c)
+  {
+    ASSERT_EQ(epee::misc_utils::parse::isspace(c), strchr("\r\n\t\f\v ", c) != NULL);
+  }
+}
+
+TEST(parsing, isdigit)
+{
+  ASSERT_FALSE(epee::misc_utils::parse::isdigit(0));
+  for (int c = 1; c < 256; ++c)
+  {
+    ASSERT_EQ(epee::misc_utils::parse::isdigit(c), strchr("0123456789", c) != NULL);
+  }
+}
+
+TEST(parsing, number)
+{
+  boost::string_ref val;
+  std::string s;
+  std::string::const_iterator i;
+
+  // the parser expects another character to end the number, and accepts things
+  // that aren't numbers, as it's meant as a pre-filter for strto* functions,
+  // so we just check that numbers get accepted, but don't test non numbers
+
+  s = "0 ";
+  i = s.begin();
+  epee::misc_utils::parse::match_number(i, s.end(), val);
+  ASSERT_EQ(val, "0");
+
+  s = "000 ";
+  i = s.begin();
+  epee::misc_utils::parse::match_number(i, s.end(), val);
+  ASSERT_EQ(val, "000");
+
+  s = "10x";
+  i = s.begin();
+  epee::misc_utils::parse::match_number(i, s.end(), val);
+  ASSERT_EQ(val, "10");
+
+  s = "10.09/";
+  i = s.begin();
+  epee::misc_utils::parse::match_number(i, s.end(), val);
+  ASSERT_EQ(val, "10.09");
+
+  s = "-1.r";
+  i = s.begin();
+  epee::misc_utils::parse::match_number(i, s.end(), val);
+  ASSERT_EQ(val, "-1.");
+
+  s = "-49.;";
+  i = s.begin();
+  epee::misc_utils::parse::match_number(i, s.end(), val);
+  ASSERT_EQ(val, "-49.");
+
+  s = "0.78/";
+  i = s.begin();
+  epee::misc_utils::parse::match_number(i, s.end(), val);
+  ASSERT_EQ(val, "0.78");
+
+  s = "33E9$";
+  i = s.begin();
+  epee::misc_utils::parse::match_number(i, s.end(), val);
+  ASSERT_EQ(val, "33E9");
+
+  s = ".34e2=";
+  i = s.begin();
+  epee::misc_utils::parse::match_number(i, s.end(), val);
+  ASSERT_EQ(val, ".34e2");
+
+  s = "-9.34e-2=";
+  i = s.begin();
+  epee::misc_utils::parse::match_number(i, s.end(), val);
+  ASSERT_EQ(val, "-9.34e-2");
+
+  s = "+9.34e+03=";
+  i = s.begin();
+  epee::misc_utils::parse::match_number(i, s.end(), val);
+  ASSERT_EQ(val, "+9.34e+03");
+}