''' Provide functions and classes to help with various JS and CSS compilation.
'''
from __future__ import absolute_import
import logging
logger = logging.getLogger(__name__)
import io
import os
import sys
import six
import json
import hashlib
from os.path import dirname, join, abspath, exists, isabs
from subprocess import Popen, PIPE
from ..model import Model
from ..settings import settings
from .string import snakify
# XXX: this is the same as bokehjs/src/js/plugin-prelude.js
_plugin_prelude = \
"""
(function outer(modules, cache, entry) {
if (Bokeh != null) {
for (var name in modules) {
Bokeh.require.modules[name] = modules[name];
}
for (var i = 0; i < entry.length; i++) {
var plugin = Bokeh.require(entry[i]);
Bokeh.Models.register_models(plugin.models);
for (var name in plugin) {
if (name !== "models") {
Bokeh[name] = plugin[name];
}
}
}
} else {
throw new Error("Cannot find Bokeh. You have to load it prior to loading plugins.");
}
})
"""
_plugin_template = \
"""
%(prelude)s
({
"custom/main": [function(require, module, exports) {
module.exports = {
models: {
%(exports)s
}
};
}, {}],
%(modules)s
}, {}, ["custom/main"]);
"""
_style_template = \
"""
(function() {
var head = document.getElementsByTagName('head')[0];
var style = document.createElement('style');
style.type = 'text/css';
var css = %(css)s;
if (style.styleSheet) {
style.styleSheet.cssText = css;
} else {
style.appendChild(document.createTextNode(css));
}
head.appendChild(style);
}());
"""
_export_template = \
""""%(name)s": require("%(module)s").%(name)s"""
_module_template = \
""""%(module)s": [function(require, module, exports) {\n%(code)s\n}, %(deps)s]"""
[docs]class AttrDict(dict):
''' Provide a dict subclass that supports access by named attributes.
'''
def __getattr__(self, key):
return self[key]
[docs]class CompilationError(RuntimeError):
''' A RuntimeError subclass for reporting JS compilation errors.
'''
def __init__(self, error):
super(CompilationError, self).__init__()
self.line = error.get("line")
self.column = error.get("column")
self.message = error.get("message")
self.text = error.get("text")
self.annotated = error.get("annotated")
def __str__(self):
return self.text
bokehjs_dir = settings.bokehjsdir()
def _detect_nodejs():
if settings.nodejs_path() is not None:
nodejs_paths = [settings.nodejs_path()]
else:
nodejs_paths = ["nodejs", "node"]
for nodejs_path in nodejs_paths:
try:
proc = Popen([nodejs_path, "--version"], stdout=PIPE, stderr=PIPE)
proc.wait()
except OSError:
pass
else:
return nodejs_path
else:
raise RuntimeError('node.js is needed to allow compilation of custom models ' +
'("conda install -c bokeh nodejs" or follow https://nodejs.org/en/download/)')
_nodejs = None
_npmjs = None
def _nodejs_path():
global _nodejs
if _nodejs is None:
_nodejs = _detect_nodejs()
return _nodejs
def _npmjs_path():
global _npmjs
if _npmjs is None:
_npmjs = join(dirname(_nodejs_path()), "npm")
return _npmjs
def _run(app, argv, input=None):
proc = Popen([app] + argv, stdout=PIPE, stderr=PIPE, stdin=PIPE)
(stdout, errout) = proc.communicate(input=None if input is None else json.dumps(input).encode())
if proc.returncode != 0:
raise RuntimeError(errout)
else:
return stdout.decode('utf-8')
def _run_nodejs(argv, input=None):
return _run(_nodejs_path(), argv, input)
def _run_npmjs(argv, input=None):
return _run(_npmjs_path(), argv, input)
def _version(run_app):
try:
version = run_app(["--version"])
except RuntimeError:
return None
else:
return version.strip()
def nodejs_version():
return _version(_run_nodejs)
def npmjs_version():
return _version(_run_npmjs)
def nodejs_compile(code, lang="javascript", file=None):
compilejs_script = join(bokehjs_dir, "js", "compile.js")
output = _run_nodejs([compilejs_script], dict(code=code, lang=lang, file=file))
return AttrDict(json.loads(output))
class Implementation(object):
file = None
class Inline(Implementation):
def __init__(self, code, file=None):
self.code = code
self.file = file
class CoffeeScript(Inline):
@property
def lang(self):
return "coffeescript"
class TypeScript(Inline):
@property
def lang(self):
return "typescript"
class JavaScript(Inline):
@property
def lang(self):
return "javascript"
class Less(Inline):
@property
def lang(self):
return "less"
class FromFile(Implementation):
def __init__(self, path):
with io.open(path, encoding="utf-8") as f:
self.code = f.read()
self.file = path
@property
def lang(self):
if self.file.endswith(".coffee"):
return "coffeescript"
if self.file.endswith((".ts", ".tsx")):
return "typescript"
if self.file.endswith(".js"):
return "javascript"
if self.file.endswith((".css", ".less")):
return "less"
#: recognized extensions that can be compiled
exts = (".coffee", ".ts", ".tsx", ".js", ".css", ".less")
class CustomModel(object):
def __init__(self, cls):
self.cls = cls
@property
def name(self):
return self.cls.__name__
@property
def full_name(self):
name = self.cls.__module__ + "." + self.name
return name.replace("__main__.", "")
@property
def file(self):
module = sys.modules[self.cls.__module__]
if hasattr(module, "__file__"):
return abspath(module.__file__)
else:
return None
@property
def path(self):
path = getattr(self.cls, "__base_path__", None)
if path is not None:
return path
elif self.file is not None:
return dirname(self.file)
else:
return os.getcwd()
@property
def implementation(self):
impl = self.cls.__implementation__
if isinstance(impl, six.string_types):
if "\n" not in impl and impl.endswith(exts):
impl = FromFile(impl if isabs(impl) else join(self.path, impl))
else:
impl = CoffeeScript(impl)
if isinstance(impl, Inline) and impl.file is None:
impl = impl.__class__(impl.code, (self.file or "<string>") + ":" + self.name)
return impl
@property
def dependencies(self):
return getattr(self.cls, "__dependencies__", {})
@property
def module(self):
return "custom/%s" % snakify(self.full_name)
[docs]def bundle_models(models):
"""Create a bundle of `models`. """
custom_models = {}
for cls in models:
impl = getattr(cls, "__implementation__", None)
if impl is not None:
model = CustomModel(cls)
custom_models[model.full_name] = model
if not custom_models:
return None
ordered_models = sorted(custom_models.values(), key=lambda model: model.full_name)
exports = []
modules = []
with io.open(join(bokehjs_dir, "js", "modules.json"), encoding="utf-8") as f:
known_modules = json.loads(f.read())
known_modules = set(known_modules["bokehjs"] + known_modules["widgets"])
custom_impls = {}
dependencies = []
for model in ordered_models:
dependencies.extend(list(model.dependencies.items()))
if dependencies:
dependencies = sorted(dependencies, key=lambda name_version: name_version[0])
_run_npmjs(["install", "--no-progress"] + [ name + "@" + version for (name, version) in dependencies ])
for model in ordered_models:
impl = model.implementation
compiled = nodejs_compile(impl.code, lang=impl.lang, file=impl.file)
if "error" in compiled:
raise CompilationError(compiled.error)
custom_impls[model.full_name] = compiled
extra_modules = {}
def resolve_modules(to_resolve, root):
resolved = {}
for module in to_resolve:
if module.startswith(("./", "../")):
def mkpath(module, ext=""):
return abspath(join(root, *module.split("/")) + ext)
if module.endswith(exts):
path = mkpath(module)
if not exists(path):
raise RuntimeError("no such module: %s" % module)
else:
for ext in exts:
path = mkpath(module, ext)
if exists(path):
break
else:
raise RuntimeError("no such module: %s" % module)
impl = FromFile(path)
compiled = nodejs_compile(impl.code, lang=impl.lang, file=impl.file)
if "error" in compiled:
raise CompilationError(compiled.error)
if impl.lang == "less":
code = _style_template % dict(css=json.dumps(compiled.code))
deps = []
else:
code = compiled.code
deps = compiled.deps
sig = hashlib.sha256(code.encode('utf-8')).hexdigest()
resolved[module] = sig
deps_map = resolve_deps(deps, dirname(path))
if sig not in extra_modules:
extra_modules[sig] = True
modules.append((sig, code, deps_map))
else:
raise RuntimeError("no such module: %s" % module)
return resolved
def resolve_deps(deps, root):
custom_modules = set([ model.module for model in custom_models.values() ])
missing = set(deps) - known_modules - custom_modules
return resolve_modules(missing, root)
for model in custom_models.values():
compiled = custom_impls[model.full_name]
deps_map = resolve_deps(compiled.deps, model.path)
exports.append((model.name, model.module))
modules.append((model.module, compiled.code, deps_map))
# sort everything by module name
exports = sorted(exports, key=lambda spec: spec[1])
modules = sorted(modules, key=lambda spec: spec[0])
sep = ",\n"
exports = sep.join([ _export_template % dict(name=name, module=module) for (name, module) in exports ])
modules = sep.join([ _module_template % dict(module=module, code=code, deps=json.dumps(deps)) for (module, code, deps) in modules ])
return _plugin_template % dict(prelude=_plugin_prelude, exports=exports, modules=modules)
def bundle_all_models():
return bundle_models(Model.model_class_reverse_map.values()) or ""
