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#!/usr/bin/env python
# Copyright (c) 2013 Google Inc. 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 with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# 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.
import re
import sys
import json
def parse_idl_file(idlFileName):
idlFile = open(idlFileName, "r")
source = idlFile.read()
idlFile.close()
source = re.sub(r"//.*\n", "", source) # Remove line comments
source = re.sub(r"\s+", " ", source) # Line breaks to spaces, collapse spaces
source = re.sub(r"/\*.*?\*/", "", source) # Remove block comments
source = re.sub(r"\[.*?\]", "", source) # Remove method parameters and array type suffixes
source = re.sub(r"\?", "", source) # Remove optional type suffixes
parsed_webgl_calls = []
# Search for method signatures
for line in source.split(";"):
match = re.match(r"^\s*(\w[\w\s]*)\s+(\w+)\s*\(([^()]*)\)", line)
if not match:
continue
return_type = match.group(1).strip()
function_name = match.group(2)
arguments_string = match.group(3)
# Search for argument signatures
argument_types = []
for argument in arguments_string.split(","):
match = re.match(r"^\s*(\w[\w\s]*)\s+(\w+)\s*$", argument)
if not match:
continue
argument_types.append(match.group(1).strip())
# Special case for texParameterf/texParameteri and getTexParameter: treat the parameter as GLenum regardless of the IDL specification:
# void texParameterf(GLenum target, GLenum pname, GLfloat param)
# void texParameteri(GLenum target, GLenum pname, GLint param)
# any getTexParameter(GLenum target, GLenum pname)
if function_name == "texParameterf" or function_name == "texParameteri":
argument_types[2] = "GLenum"
if function_name == "getTexParameter":
return_type = "GLenum"
parsed_webgl_calls.append({"function_name": function_name, "return_type": return_type, "argument_types": argument_types})
return parsed_webgl_calls
def generate_json_lines(parsed_webgl_calls):
enum_types = ["GLenum", "GLbitfield"]
hints = {
"blendFunc": ["ZERO", "ONE"],
"blendFuncSeparate": ["ZERO", "ONE"],
"stencilOp": ["ZERO", "ONE"],
"stencilOpSeparate": ["ZERO", "ONE"],
"drawArrays": ["POINTS", "LINES"],
"drawElements": ["POINTS", "LINES"],
"getError": ["NO_ERROR"],
}
json_lines = []
for call in parsed_webgl_calls:
function_name = call["function_name"]
return_type = call["return_type"]
argument_types = call["argument_types"]
if not (return_type in enum_types or set(enum_types).intersection(argument_types)):
continue
# Using "aname" instead of "name" to make it the first parameter after sorting (for readability sake).
result = {"aname": function_name}
if return_type in enum_types:
result["returnType"] = return_type[2:]
for enum_type in enum_types:
if not enum_type in argument_types:
continue
result[enum_type[2:]] = [i for i in range(len(argument_types)) if argument_types[i] == enum_type]
if function_name in hints:
result["hints"] = hints[function_name]
result_json = json.dumps(result, sort_keys=True)
if result_json in json_lines:
continue
json_lines.append(result_json)
return json_lines
def check_injected_script_js_file(jsFileName, json_lines):
jsFile = open(jsFileName, "r")
source = jsFile.read()
jsFile.close()
missing_lines = []
for line in json_lines:
if not line in source:
missing_lines.append(line)
if len(missing_lines):
print "ERROR: Injected script file is missing %d line(s) of generated code: " % len(missing_lines)
for line in missing_lines:
print " %s" % line
else:
print "OK"
def main(argv):
if len(argv) < 2:
print('Usage: %s path/to/WebGLRenderingContext.idl [path/to/InjectedScriptCanvasModuleSource.js]' % argv[0])
return 1
parsed_webgl_calls = parse_idl_file(argv[1])
json_lines = generate_json_lines(parsed_webgl_calls)
if len(json_lines) < 50:
print "WARNING: too few WebGL methods parsed: %d! Something wrong with the IDL file parsing?" % len(json_lines)
if len(argv) > 2:
check_injected_script_js_file(argv[2], json_lines)
if __name__ == '__main__':
sys.exit(main(sys.argv))
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