1 files changed, 94 insertions, 0 deletions
diff --git a/bbot/variable.cxx b/bbot/variable.cxx
new file mode 100644
index 0000000..a25b007
--- /dev/null
+++ b/bbot/variable.cxx
@@ -0,0 +1,94 @@
+// file      : bbot/variable.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <bbot/variable>
+
+#include <utility> // move()
+
+using namespace std;
+
+namespace bbot
+{
+  variable::
+  variable (string v): string (move (v))
+  {
+    // Scan the string untill the end to check that the quoting is terminated.
+    // We will also make sure that the name doesn't contain spaces and the
+    // value is provided.
+    //
+    char quoting ('\0'); // Current quoting mode, can be used as bool.
+    bool name (true);    // True while we are parsing the variable name.
+
+    auto b (cbegin ());
+    auto i (b);
+
+    auto bad_variable = [&b, &i] (const string& d)
+    {
+      throw invalid_variable (i - b, d);
+    };
+
+    for (auto e (cend ()); i != e; ++i)
+    {
+      char c (*i);
+
+      if (!quoting)
+      {
+        if (c == '"' || c == '\'') // Begin of quoted string,
+        {
+          quoting = c;
+          continue;
+        }
+      }
+      else if (c == quoting)       // End of quoted string,
+      {
+        quoting = '\0';
+        continue;
+      }
+
+      if (name)
+      {
+        if (c == ' ' || c == '\t')
+          bad_variable ("expected variable assignment");
+        else if (c == '=')
+          name = false;
+      }
+    }
+
+    if (quoting)
+      bad_variable ("unterminated quoted string");
+
+    if (name)
+      bad_variable ("no variable value");
+  }
+
+  string variable::
+  unquoted () const
+  {
+    string r;
+    char quoting ('\0');  // Current quoting mode, can be used as bool.
+
+    for (auto i (cbegin ()), e (cend ()); i != e; ++i)
+    {
+      char c (*i);
+
+      if (!quoting)
+      {
+        if (c == '"' || c == '\'') // Begin of quoted string.
+        {
+          quoting = c;
+          continue;
+        }
+      }
+      else if (c == quoting)       // End of quoted string.
+      {
+        quoting = '\0';
+        continue;
+      }
+
+      r += c;
+    }
+
+    return r;
+  }
+}