Implement manifests and build_config

1 files changed, 121 insertions, 0 deletions

diff --git a/bbot/build-config.cxx b/bbot/build-config.cxx
new file mode 100644
index 0000000..226ead3
--- /dev/null
+++ b/bbot/build-config.cxx
@@ -0,0 +1,121 @@
+// file      : bbot/build-config.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <bbot/build-config>
+
+#include <string>
+#include <cstddef>   // size_t
+#include <utility>   // move()
+#include <stdexcept> // invalid_argument
+
+#include <butl/path>
+#include <butl/fdstream>
+#include <butl/tab-parser>
+
+using namespace std;
+using namespace butl;
+
+namespace bbot
+{
+  LIBBBOT_EXPORT build_configs
+  parse_buildtab (istream& is, const string& name)
+  {
+    build_configs r;
+    tab_parser parser (is, name);
+
+    tab_fields tl;
+    while (!(tl = parser.next ()).empty ())
+    {
+      size_t n (tl.size ()); // Fields count.
+      size_t i (0);          // The field currently being processed.
+
+      // Throw tab_parsing for the field currently being processed. If i == n
+      // then we refer to the end-of-line column (presumably reporting a missed
+      // field).
+      //
+      auto bad_line = [&name, &tl, &i, n] (const string& d, size_t offset = 0)
+      {
+        // Offset beyond the end-of-line is meaningless.
+        //
+        assert (i < n || (i == n && offset == 0));
+
+        throw tab_parsing (name,
+                           tl.line,
+                           i == n
+                           ? tl.end_column
+                           : tl[i].column + offset,
+                           d);
+      };
+
+      build_config config;
+      config.machine_pattern = move (tl[i++].value);
+
+      // Configuration name field is a required one.
+      //
+      if (i == n)
+        bad_line ("no configuration name found");
+
+      config.name = move (tl[i].value);
+
+      // Make sure the name is unique.
+      //
+      for (const auto& c: r)
+        if (c.name == config.name)
+          bad_line ("duplicate configuration name");
+
+      // If there is no target nor configuration variables then save the
+      // configuration and proceed with the next line.
+      //
+      if (++i == n)
+      {
+        r.emplace_back (move (config));
+        continue;
+      }
+
+      // If the third field doesn't contain '=' character, then we will treat
+      // it as a target.
+      //
+      if (tl[i].value.find ('=') == string::npos)
+      {
+        try
+        {
+          config.target = target_triplet (tl[i].value);
+        }
+        catch (const invalid_argument& e)
+        {
+          bad_line (e.what ());
+        }
+
+        ++i;
+      }
+
+      try
+      {
+        for (; i < n; ++i)
+          config.vars.emplace_back (variable (move (tl[i].value)));
+      }
+      catch (const invalid_variable& e)
+      {
+        bad_line (e.what (), e.pos); // Note that tl[i].value is moved from,
+                                     // but happily we don't use it
+      }
+
+      // Save the configuration.
+      //
+      r.emplace_back (move (config));
+    }
+
+    return r;
+  }
+
+  build_configs
+  parse_buildtab (const path& p)
+  {
+    ifdstream ifs (p);
+    build_configs r (parse_buildtab (ifs, p.string ()));
+
+    ifs.close (); // Throws on failure.
+    return r;
+  }
+}