From: Christian Herdtweck <christian.herdtweck@intra2net.com>
Date: Tue, 24 Jan 2017 09:54:08 +0000 (+0100)
Subject: Create string-function shorten_stl_types
X-Git-Tag: v2.9~5^2~3
X-Git-Url: http://developer.intra2net.com/git/?p=libi2ncommon;a=commitdiff_plain;h=1a0267e54c276e935408b1c45c30b02ddd822ac4

Create string-function shorten_stl_types
---

diff --git a/src/stringfunc.cpp b/src/stringfunc.cpp
index 266b34f..9ea0ff2 100644
--- a/src/stringfunc.cpp
+++ b/src/stringfunc.cpp
@@ -597,6 +597,86 @@ throw (std::runtime_error)
 } // eo convert_hex_to_binary(const std::string&)
 
 
+static list<string>& alloc_template_starts()
+{
+    static list<string> result;
+    if (result.empty())
+    {
+        result.push_back("std::list");
+        result.push_back("std::vector");
+    }
+    return result;
+}
+
+string shorten_stl_types(const string &input)
+{
+    string output = input;
+
+    // first: replace fixed string for std::string
+    replace_all(output, "std::basic_string<char, std::char_traits<char>, std::allocator<char> >",
+                        "std::string");
+
+    // loop over list/vector/... that have an allocator, e.g.
+    // std::list< some_type_here, std::allocator<some_type_here> >
+    string::size_type start, comma, end, len, start_text_len;
+    int n_open_brackets;
+    string allocator_text;
+    BOOST_FOREACH(const string &start_text, alloc_template_starts())
+    {
+        start = 0;
+        comma = 0;
+        end = 0;
+        start_text_len = start_text.length();
+        while( (start=output.find(start_text+"<", start)) != string::npos )
+        {
+            len = output.length();
+            start += start_text_len+1;   // start next iter and tests here after opening bracket
+
+            // now comes the tricky part: find matching ',' and the closing '>' even if "subtype" is template again
+            comma = start;
+            n_open_brackets = 1;    // the bracket right after start_text counts as first
+            while (comma < len && n_open_brackets > 0)
+            {
+                if (output[comma] == ',' && n_open_brackets == 1)
+                    break;
+                else if (output[comma] == '<')
+                    ++n_open_brackets;
+                else if (output[comma] == '>')
+                    --n_open_brackets;
+                ++comma;
+            }
+            end = comma+1;
+            while (end < len && n_open_brackets > 0)
+            {
+                if (output[end] == '<')
+                    ++n_open_brackets;
+                else if (output[end] == '>')
+                {
+                    --n_open_brackets;
+                    if (n_open_brackets == 0)
+                        break;  // do not increment end
+                }
+                ++end;
+            }
+
+            // check that start < comma < end < len && n_open_brackets == 0
+            if (start >= comma || comma >= end || end >= len || n_open_brackets != 0)
+                continue;   // input seems to be of unexpected form
+
+            // check that type in allocator is same as until comma
+            string type = output.substr(start, comma-start);
+            if (type[type.length()-1] == '>')
+                allocator_text = string("std::allocator<") + type + " > ";
+            else
+                allocator_text = string("std::allocator<") + type + "> ";
+            if (output.substr(comma+2, end-comma-2) == allocator_text)
+                output.replace(comma+2, end-comma-2, "_alloc_");
+        }
+    }
+
+    return output;
+}
+
 } // eo namespace I2n
 
 
diff --git a/src/stringfunc.hxx b/src/stringfunc.hxx
index 2cf7258..824df97 100644
--- a/src/stringfunc.hxx
+++ b/src/stringfunc.hxx
@@ -256,6 +256,18 @@ std::string to_string(const T& v)
 } // eo to_string(const T&)
 
 
+/**
+ * Create a string with types shortened in texts describing C++ types
+ *
+ * for example: std::list<some_long_type, std::allocator<some_long_type> >
+ * -->  std::list<some_long_type, _alloc_>
+ *
+ * and std::basic_string<char, std::char_traits<char>, std::allocator<char> >
+ * --> std::string
+ */
+std::string shorten_stl_types(const std::string &input);
+
+
 } // eo namespace I2n