# -*- coding: utf-8 -*-

#-------------------------------------------------------------------------
# drawElements Quality Program utilities
# --------------------------------------
#
# Copyright 2015 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
#-------------------------------------------------------------------------

import sys
from genutil import *

# \todo [arttu 2012-12-20] Current set tests variable names only, add function names, structure names, and field selectors.

# Templates

identifierCaseTemplate = """
case ${{NAME}}
	expect compile_fail
	values {}

	both ""
		precision mediump float;

		${DECLARATIONS}

		void main()
		{
			${SETUP}
			float ${{IDENTIFIER}} = 1.0;
			${OUTPUT}
		}
	""
end
"""[1:-1]

# Classes

class IdentifierCase(ShaderCase):
	def __init__(self, name, identifier):
		self.name		= name
		self.identifier = identifier

	def __str__(self):
		params = {	"NAME"			: self.name,
					"IDENTIFIER"	: self.identifier }
		return fillTemplate(identifierCaseTemplate, params)


# Declarations

KEYWORDS = [
	"attribute", "const", "uniform", "varying",	"break", "continue", "do", "for", "while",
	"if", "else", "in", "out", "inout", "float", "int", "void", "bool", "true", "false",
	"lowp", "mediump", "highp", "precision", "invariant", "discard", "return", "mat2", "mat3",
	"mat4",	"vec2", "vec3", "vec4", "ivec2", "ivec3", "ivec4", "bvec2", "bvec3", "bvec4",
	"sampler2D", "samplerCube",	"struct"
]

RESERVED_KEYWORDS = [
	"asm", "class", "union", "enum", "typedef", "template", "this", "packed", "goto", "switch",
	"default", "inline", "noinline", "volatile", "public", "static", "extern", "external",
	"interface", "flat", "long", "short", "double", "half", "fixed", "unsigned", "superp",
	"input", "output", "hvec2", "hvec3", "hvec4", "dvec2", "dvec3", "dvec4", "fvec2", "fvec3",
	"fvec4", "sampler1D", "sampler3D", "sampler1DShadow", "sampler2DShadow", "sampler2DRect",
	"sampler3DRect", "sampler2DRectShadow", "sizeof", "cast", "namespace", "using"
]

INVALID_IDENTIFIERS = [
	("two_underscores_begin",	"__invalid"),
	("two_underscores_middle",	"in__valid"),
	("two_underscores_end",		"invalid__"),
	("gl_begin",				"gl_Invalid"),
	("digit",					"0123"),
	("digit_begin",				"0invalid")
]

# Keyword usage

keywords			= []
reservedKeywords	= []
invalidIdentifiers	= []

for keyword in KEYWORDS:
	keywords.append(IdentifierCase(keyword, keyword))			# Keywords

for keyword in RESERVED_KEYWORDS:
	reservedKeywords.append(IdentifierCase(keyword, keyword))	# Reserved keywords

for (name, identifier) in INVALID_IDENTIFIERS:
	invalidIdentifiers.append(IdentifierCase(name, identifier)) # Invalid identifiers

keywordCases = [
	CaseGroup("keywords",				"Usage of keywords as identifiers.",			keywords),
	CaseGroup("reserved_keywords",		"Usage of reserved keywords as identifiers.",	reservedKeywords),
	CaseGroup("invalid_identifiers",	"Usage of invalid identifiers.",				invalidIdentifiers)
]

# Main program

if __name__ == "__main__":
	print("Generating shader case files.")
	writeAllCases("keywords.test", keywordCases)