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# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
# This file is meant to be included into a target to provide a rule
# to generate Java source files from templates that are processed
# through the host C pre-processor.
#
# This assumes a GNU-compatible pre-processor installed as 'cpp'.
# Only tested on Linux.
#
# To use this, create a gyp target with the following form:
# {
# 'target_name': 'android_net_java_constants',
# 'type': 'none',
# 'sources': [
# 'net/android/NetError.template',
# ],
# 'variables': {
# 'package_name': 'org.chromium.net',
# 'template_deps': ['net/base/certificate_mime_type_list.h'],
# },
# 'includes': [ '../build/android/java_constants.gypi' ],
# },
#
# The 'sources' entry should only list template file. The template file
# itself should use the 'ClassName.template' format, and will generate
# 'gen/templates/<package-name>/ClassName.java. The files which template
# dependents on and typically included by the template should be listed
# in template_deps variables. Any change to them will force a rebuild of
# the template, and hence of any source that depends on it.
#
{
# Location where all generated Java sources will be placed.
'variables': {
'output_dir': '<(SHARED_INTERMEDIATE_DIR)/templates/<(package_name)'
},
# Ensure that the output directory is used in the class path
# when building targets that depend on this one.
'direct_dependent_settings': {
'variables': {
'generated_src_dirs': [
'<(output_dir)/',
],
},
},
# Define a single rule that will be apply to each .template file
# listed in 'sources'.
'rules': [
{
'rule_name': 'generate_java_constants',
'extension': 'template',
# Set template_deps as additional dependencies.
'inputs': ['<@(template_deps)'],
'outputs': [
'<(output_dir)/<(RULE_INPUT_ROOT).java'
],
'action': [
'cpp', # invoke host pre-processor.
'-x', 'c-header', # treat sources as C header files
'-P', # disable line markers, i.e. '#line 309'
'-I', '<(DEPTH)', # Add project top-level to include path
'-o', '<@(_outputs)', # Specify output file
'<(RULE_INPUT_PATH)', # Specify input file
],
'message': 'Generating Java from cpp template <(RULE_INPUT_PATH)',
}
],
}
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