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# Copyright 2019 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import os
import sys
import collections
import re
import textwrap
from style_variable_generator import path_overrides
from style_variable_generator.color import Color
from style_variable_generator.opacity import Opacity
from style_variable_generator.model import Model, Modes, VariableType
_FILE_PATH = os.path.dirname(os.path.realpath(__file__))
_JSON5_PATH = os.path.join(_FILE_PATH, os.pardir, os.pardir, 'third_party',
'pyjson5', 'src')
sys.path.insert(1, _JSON5_PATH)
import json5
_JINJA2_PATH = os.path.join(_FILE_PATH, os.pardir, os.pardir, 'third_party')
sys.path.insert(1, _JINJA2_PATH)
import jinja2
class BaseGenerator:
'''A generic style variable generator.
Subclasses should provide format-specific generation templates, filters and
globals to render their output.
'''
@staticmethod
def GetName():
return None
def __init__(self):
self.out_file_path = None
self.model = Model()
# A map of input filepaths to their context object.
self.in_file_to_context = dict()
# If specified, only generates the given mode.
self.generate_single_mode = None
# A dictionary of options used to alter generator function. See
# ./README.md for each generators list of options.
self.generator_options = {}
# If true, will attempt to resolve all blend() colors to the RGBA values at
# compile time. Note that json5 files can specify "preblend" to override
# this setting for specific files.
def DefaultPreblend(self):
return True
def GetInputFiles(self):
return sorted(self.in_file_to_context.keys())
def AddJSONFilesToModel(self, paths):
'''Adds one or more JSON files to the model.
'''
for path in paths:
try:
with open(path, 'r') as f:
self.AddJSONToModel(f.read(), path)
except ValueError as err:
raise ValueError(f'Could not add {path}') from err
self.model.PostProcess(default_preblend=self.DefaultPreblend())
def AddJSONToModel(self, json_string, in_file=None):
'''Adds a |json_string| with variable definitions to the model.
See *test.json5 files for a defacto format reference.
|in_file| is used to populate a file-to-context map.
'''
# TODO(calamity): Add allow_duplicate_keys=False once pyjson5 is
# rolled.
data = json5.loads(json_string,
object_pairs_hook=collections.OrderedDict)
context = data.get('options', {})
context['token_namespace'] = data.get('token_namespace', '')
self.in_file_to_context[in_file] = context
# Add variables to the model.
for name, value in data.get('colors', {}).items():
self.model.Add(VariableType.COLOR, name, value, context)
for name, value in data.get('opacities', {}).items():
self.model.Add(VariableType.OPACITY, name, value, context)
for name, value in data.get('legacy_mappings', {}).items():
self.model.Add(VariableType.LEGACY_MAPPING, name, value, context)
typography = data.get('typography')
if typography:
for name, value in typography['font_families'].items():
self.model.Add(VariableType.FONT_FAMILY, name, value, context)
for name, value in typography['font_faces'].items():
self.model.Add(VariableType.FONT_FACE, name, value, context)
for name, value_obj in typography['typefaces'].items():
self.model.Add(VariableType.TYPEFACE, name, value_obj, context)
for group_name, value_obj in data.get('untyped_css', {}).items():
for var_name, value in value_obj.items():
self.model.Add(VariableType.UNTYPED_CSS, var_name, value,
context)
def ApplyTemplate(self, style_generator, path_to_template, params):
loader_root_dir = path_overrides.GetFileSystemLoaderRootDirectory()
jinja_env = jinja2.Environment(
loader=jinja2.FileSystemLoader(loader_root_dir),
keep_trailing_newline=True)
jinja_env.globals.update(style_generator.GetGlobals())
jinja_env.filters.update(style_generator.GetFilters())
template = jinja_env.get_template(
path_overrides.GetPathToTemplate(path_to_template))
return template.render(params)
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