Merge pull request #254 from bbbgan/fix_parse_number

Author: qicosmos

iguana/detail/charconv.h

@@ -3,27 +3,36 @@
 
 #include "dragonbox_to_chars.h"
 #include "fast_float.h"
+#include "iguana/define.h"
 #include "itoa.hpp"
 
-
 namespace iguana {
 template <typename T>
 struct is_char_type
     : std::disjunction<std::is_same<T, char>, std::is_same<T, wchar_t>,
                        std::is_same<T, char16_t>, std::is_same<T, char32_t>> {};
 
 namespace detail {
-template <typename U>
+
+// check_number==true: check if the string [first, last) is a legal number
+template <bool check_number = true, typename U>
 std::pair<const char *, std::errc> from_chars(const char *first,
-                                              const char *last,
-                                              U &value) noexcept {
+                                              const char *last, U &value) {
   using T = std::decay_t<U>;
   if constexpr (std::is_floating_point_v<T>) {
     auto [p, ec] = fast_float::from_chars(first, last, value);
+    if constexpr (check_number) {
+      if (p != last || ec != std::errc{})
+        IGUANA_UNLIKELY { throw std::runtime_error("Failed to parse number"); }
+    }
     return {p, ec};
   }
   else {
     auto [p, ec] = std::from_chars(first, last, value);
+    if constexpr (check_number) {
+      if (p != last || ec != std::errc{})
+        IGUANA_UNLIKELY { throw std::runtime_error("Failed to parse number"); }
+    }
     return {p, ec};
   }
 }

iguana/json_reader.hpp

@@ -68,8 +68,8 @@ IGUANA_INLINE void from_json_impl(U &value, It &&it, It &&end) {
     if (size == 0)
       IGUANA_UNLIKELY { throw std::runtime_error("Failed to parse number"); }
     const auto start = &*it;
-    auto [p, ec] = detail::from_chars(start, start + size, value);
-    if (ec != std::errc{} || *p == '.')
+    auto [p, ec] = detail::from_chars<false>(start, start + size, value);
+    if (ec != std::errc{} || !can_follow_number(*p))
       IGUANA_UNLIKELY { throw std::runtime_error("Failed to parse number"); }
     it += (p - &*it);
   }
@@ -82,9 +82,7 @@ IGUANA_INLINE void from_json_impl(U &value, It &&it, It &&end) {
       buffer[i] = *it++;
       ++i;
     }
-    auto [p, ec] = detail::from_chars(buffer, buffer + i, value);
-    if (ec != std::errc{})
-      IGUANA_UNLIKELY { throw std::runtime_error("Failed to parse number"); }
+    detail::from_chars(buffer, buffer + i, value);
   }
 }
 

iguana/json_util.hpp

@@ -18,10 +18,7 @@ class numeric_str {
     if (val_.empty())
       IGUANA_UNLIKELY { throw std::runtime_error("Failed to parse number"); }
     T res;
-    auto [_, ec] =
-        detail::from_chars(val_.data(), val_.data() + val_.size(), res);
-    if (ec != std::errc{})
-      IGUANA_UNLIKELY { throw std::runtime_error("Failed to parse number"); }
+    detail::from_chars(val_.data(), val_.data() + val_.size(), res);
     return res;
   }
 
@@ -214,4 +211,28 @@ IGUANA_INLINE bool is_numeric(char c) noexcept {
   return static_cast<bool>(is_num[static_cast<unsigned int>(c)]);
 }
 
+// '\t' '\r' '\n'  '"' '}' ']' ',' ' '  '\0'
+IGUANA_INLINE bool can_follow_number(char c) noexcept {
+  static constexpr int can_follow_num[256] = {
+      //  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
+      1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0,  // 0
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 1
+      1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,  // 2
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 3
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 4
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,  // 5
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 6
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0,  // 7
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 8
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 9
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // A
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // B
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // C
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // D
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // E
+      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0   // F
+  };
+  return static_cast<bool>(can_follow_num[static_cast<unsigned int>(c)]);
+}
+
 }  // namespace iguana

iguana/xml_reader.hpp

@@ -5,7 +5,6 @@
 #include "detail/utf.hpp"
 #include "xml_util.hpp"
 
-
 namespace iguana {
 namespace detail {
 
@@ -34,10 +33,7 @@ IGUANA_INLINE void parse_value(U &&value, It &&begin, It &&end) {
   else if constexpr (num_v<T>) {
     auto size = std::distance(begin, end);
     const auto start = &*begin;
-    auto [p, ec] = detail::from_chars(start, start + size, value);
-    if (ec != std::errc{})
-      IGUANA_UNLIKELY
-    throw std::runtime_error("Failed to parse number");
+    detail::from_chars(start, start + size, value);
   }
   else if constexpr (char_v<T>) {
     if (static_cast<size_t>(std::distance(begin, end)) != 1)

iguana/yaml_reader.hpp

@@ -6,7 +6,6 @@
 #include "detail/utf.hpp"
 #include "yaml_util.hpp"
 
-
 namespace iguana {
 
 template <typename T, typename It, std::enable_if_t<refletable_v<T>, int> = 0>
@@ -114,10 +113,7 @@ IGUANA_INLINE void parse_value(U &value, It &&value_begin, It &&value_end) {
     IGUANA_UNLIKELY { return; }
   auto size = std::distance(value_begin, value_end);
   const auto start = &*value_begin;
-  auto [p, ec] = detail::from_chars(start, start + size, value);
-  if (ec != std::errc{})
-    IGUANA_UNLIKELY
-  throw std::runtime_error("Failed to parse number");
+  detail::from_chars(start, start + size, value);
 }
 
 // string_view should be used  for string with ' " ?

test/test.cpp

@@ -180,23 +180,22 @@ struct nest_t {
 };
 REFLECTION(nest_t, name, value, var, var2);
 
-struct point_t1 {
-  int x;
-  int y;
-};
-REFLECTION(point_t1, x, y);
-
-TEST_CASE("test double to int") {
-  point_t p{1, 0.45};
-  std::string s;
-  iguana::to_json(p, s);
-  std::cout << s << std::endl;
-  point_t1 p2;
-  CHECK_THROWS(iguana::from_json(p2, s));
-
-  point_t p3;
-  iguana::from_json(p3, s);
-  CHECK(p.y == p3.y);
+TEST_CASE("test throw while parsing an illegal number") {
+  {
+    std::string str{"[0,1.0]"};
+    std::vector<int> test{};
+    CHECK_THROWS(iguana::from_json(test, str.begin(), str.end()));
+  }
+  {
+    std::string str{"1A"};
+    int test{};
+    CHECK_THROWS(iguana::from_json(test, str.begin(), str.end()));
+  }
+  {
+    std::string str{"1.0"};
+    int test{};
+    CHECK_THROWS(iguana::from_json(test, str.begin(), str.end()));
+  }
 }
 
 TEST_CASE("test variant") {

test/test_xml.cpp

@@ -700,6 +700,31 @@ TEST_CASE("test smart_ptr") {
   validator(cont1);
 }
 
+TEST_CASE("test throw while parsing an illegal number") {
+  {
+    std::string str = R"(
+  <Contents_t>
+    <vec>42A</vec>
+    <vec_s>15</vec_s>
+    <b>test</b>
+  </Contents_t>
+    )";
+    Contents_t cont;
+    CHECK_THROWS(iguana::from_xml(cont, str));
+  }
+  {
+    std::string str = R"(
+<Contents_t>
+	<vec>42</vec>
+	<vec_s>15.7</vec_s>
+	<b>test</b>
+</Contents_t>
+  )";
+    Contents_t cont;
+    CHECK_THROWS(iguana::from_xml(cont, str));
+  }
+}
+
 struct next_obj_t {
   int x;
   int y;

test/unit_test.cpp

@@ -206,7 +206,6 @@ TEST_CASE("test parse item seq container") {
     std::array<int, 3> test{};
     CHECK_THROWS(iguana::from_json(test, str.begin(), str.end()));
   }
-
   {
     std::string str{"[0,1,2"};
     std::list<int> test{};