From 9082aa14a8580c4344ecf8cf95bad01fd86cfbe5 Mon Sep 17 00:00:00 2001
From: Pekka Enberg <penberg@cloudius-systems.com>
Date: Mon, 12 Jan 2015 10:41:48 +0200
Subject: [PATCH] configure.py: Antlr3 code generation support

This adds Antlr3 code generation support to configure.py. We need this
to start attempting to generate code for the CQL3 grammar to see where
we're at with our AST.

To enable the CQL grammar code generation, edit configure.py as follows:

  diff --git a/configure.py b/configure.py
  index 929885a..1dd607a 100755
  --- a/configure.py
  +++ b/configure.py
  @@ -233,6 +233,7 @@ deps = {
                   'gms/version_generator.cc',
                    'dht/dht.cc',
                    ]
  +                + [Antlr3Grammar('cql3/Cql.g')]
                   + [Thrift('interface/cassandra.thrift', 'Cassandra')]
                   + core
                   ),

Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
---
 configure.py | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/configure.py b/configure.py
index cf6ca70160..d4b06bfde3 100755
--- a/configure.py
+++ b/configure.py
@@ -67,6 +67,23 @@ class Thrift(object):
     def endswith(self, end):
         return self.source.endswith(end)
 
+class Antlr3Grammar(object):
+    def __init__(self, source):
+        self.source = source
+    def generated(self, gen_dir):
+        basename = os.path.splitext(self.source)[0]
+        files = [basename + ext
+                 for ext in ['Lexer.cpp', 'Lexer.hpp', 'Parser.cpp', 'Parser.hpp']]
+        return [os.path.join(gen_dir, file) for file in files]
+    def headers(self, gen_dir):
+        return [x for x in self.generated(gen_dir) if x.endswith('.hpp')]
+    def sources(self, gen_dir):
+        return [x for x in self.generated(gen_dir) if x.endswith('.cpp')]
+    def objects(self, gen_dir):
+        return [x.replace('.cpp', '.o') for x in self.sources(gen_dir)]
+    def endswith(self, end):
+        return self.source.endswith(end)
+
 modes = {
     'debug': {
         'sanitize': '-fsanitize=address -fsanitize=leak -fsanitize=undefined',
@@ -334,12 +351,16 @@ with open(buildfile, 'w') as f:
             rule thrift.{mode}
                 command = thrift -gen cpp:cob_style -out $builddir/{mode}/gen $in
                 description = THRIFT $in
+            rule antlr3.{mode}
+                command = antlr3 $in -o $builddir/{mode}/gen
+                description = ANTLR3 $in
             ''').format(mode = mode, **modeval))
         f.write('build {mode}: phony {artifacts}\n'.format(mode = mode,
             artifacts = str.join(' ', ('$builddir/' + mode + '/' + x for x in build_artifacts))))
         compiles = {}
         ragels = {}
         thrifts = []
+        antlr3_grammars = []
         for binary in build_artifacts:
             srcs = deps[binary]
             objs = ['$builddir/' + mode + '/' + src.replace('.cc', '.o')
@@ -350,6 +371,8 @@ with open(buildfile, 'w') as f:
                 if isinstance(dep, Thrift):
                     has_thrift = True
                     objs += dep.objects('$builddir/' + mode + '/gen')
+                if isinstance(dep, Antlr3Grammar):
+                    objs += dep.objects('$builddir/' + mode + '/gen')
             f.write('build $builddir/{}/{}: link.{} {}\n'.format(mode, binary, mode, str.join(' ', objs)))
             if has_thrift:
                 f.write('   libs =  -lthrift -lboost_system $libs\n')
@@ -362,6 +385,8 @@ with open(buildfile, 'w') as f:
                     ragels[hh] = src
                 elif src.endswith('.thrift'):
                     thrifts += [src]
+                elif src.endswith('.g'):
+                    antlr3_grammars += [src]
                 else:
                     raise Exeception('No rule for ' + src)
         for obj in compiles:
@@ -369,6 +394,8 @@ with open(buildfile, 'w') as f:
             gen_headers = list(ragels.keys())
             for th in thrifts:
                 gen_headers += th.headers('$builddir/{}/gen'.format(mode))
+            for g in antlr3_grammars:
+                gen_headers += g.headers('$builddir/{}/gen'.format(mode))
             f.write('build {}: cxx.{} {} || {} \n'.format(obj, mode, src, ' '.join(gen_headers)))
         for hh in ragels:
             src = ragels[hh]
@@ -379,6 +406,12 @@ with open(buildfile, 'w') as f:
             for cc in thrift.sources('$builddir/{}/gen'.format(mode)):
                 obj = cc.replace('.cpp', '.o')
                 f.write('build {}: cxx.{} {}\n'.format(obj, mode, cc))
+        for grammar in antlr3_grammars:
+            outs = ' '.join(grammar.generated('$builddir/{}/gen'.format(mode)))
+            f.write('build {}: antlr3.{} {}\n'.format(outs, mode, grammar.source))
+            for cc in grammar.sources('$builddir/{}/gen'.format(mode)):
+                obj = cc.replace('.cpp', '.o')
+                f.write('build {}: cxx.{} {}\n'.format(obj, mode, cc))
     f.write(textwrap.dedent('''\
         rule configure
           command = python3 configure.py $configure_args