Add rule for generating lexer and implement lexer shell.

src/lexer/lexer.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 12 matching lines @@
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 {
   'variables': {
     'v8_code': 1,
     'v8_enable_i18n_support%': 1,
   },
-  'includes': ['../build/toolchain.gypi', '../build/features.gypi'],
-  'target_defaults': {
-    'type': 'executable',
-    'dependencies': [
-      '../tools/gyp/v8.gyp:v8',
-    ],
-    'include_dirs': [
-      '../include',
-    ],
-    'conditions': [
-      ['v8_enable_i18n_support==1', {
-        'dependencies': [
-          '<(icu_gyp_path):icui18n',
-          '<(icu_gyp_path):icuuc',
-        ],
-      }],
-      ['OS=="win" and v8_enable_i18n_support==1', {
-        'dependencies': [
-          '<(icu_gyp_path):icudata',
-        ],
-      }],
-    ],
-  },
+  'includes': ['../../build/toolchain.gypi', '../../build/features.gypi'],
   'targets': [
     {
-      'target_name': 'shell',
+      'target_name': 'lexer-shell',
+      'type': 'executable',
+      'dependencies': [
+        '../../tools/gyp/v8.gyp:v8',
+      ],
+      # Generated source files need this explicitly:
+      'include_dirs+': [
+        '../../src',
+      ],
       'sources': [
-        'shell.cc',
+        'lexer-shell.cc',
+# TODO: fix compiler errors and add '<(SHARED_INTERMEDIATE_DIR)/lexer.cc',
+      ],
+      'conditions': [
+        ['v8_enable_i18n_support==1', {
+          'dependencies': [
+            '<(icu_gyp_path):icui18n',
+            '<(icu_gyp_path):icuuc',
+          ],
+        }],
+      ],
+      'actions': [
+        {
+          'action_name': 're2c',
+          'inputs': [
+            '../../src/lexer/lexer.re',
+          ],
+          'outputs': [
+            '<(SHARED_INTERMEDIATE_DIR)/lexer.cc',
+          ],
+          'action': [
+            '$(RE2C)',
+            '-f',
+            '-c',
+            '--output',
+            '<(SHARED_INTERMEDIATE_DIR)/lexer.cc',
+            '../../src/lexer/lexer.re',
+          ],
+        },
       ],
     },
-    {
-      'target_name': 'process',
-      'sources': [
-        'process.cc',
-      ],
-    },
-    {
-      'target_name': 'lineprocessor',
-      'sources': [
-        'lineprocessor.cc',
-      ],
-    }
   ],
 }