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# -*- coding: utf-8 -*-
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
from __future__ import division
import re
# regular expressions for parsing GLSL
re_version_pragma = r'#version\s+(\d+)(.*)?(//.*)?'
re_type = r'(?:void|int|float|vec2|vec3|vec4|mat2|mat3|mat4|\
sampler1D|sampler2D|sampler3D)'
re_identifier = r'(?:[a-zA-Z_][\w_]*)'
# variable qualifiers
re_qualifier = r'(const|uniform|attribute|varying|in|out|inout)'
# template variables like
# $func_name
re_template_var = (r"(?:(?:\$" + re_identifier + r")|(?:\$\{" +
re_identifier + r"\}))")
# function names may be either identifier or template var
re_func_name = r"(" + re_identifier + "|" + re_template_var + ")"
# type and identifier like "vec4 var_name"
re_declaration = "(?:(" + re_type + r")\s+(" + re_identifier + "))"
# qualifier, type, and identifier like "uniform vec4 var_name"
# qualifier is optional.
# may include multiple names like "attribute float x, y, z"
re_prog_var_declaration = ("(?:" + re_qualifier + r"?\s*(" + re_type +
r")\s+(" + re_identifier + r"(\s*,\s*(" +
re_identifier + "))*))")
# list of variable declarations like "vec4 var_name, float other_var_name"
re_arg_list = "(" + re_declaration + r"(?:,\s*" + re_declaration + ")*)?"
# function declaration like "vec4 function_name(float x, float y)"
re_func_decl = ("(" + re_type + r")\s+" + re_func_name + r"\s*\((void|" +
re_arg_list + r")\)")
# anonymous variable declarations may or may not include a name:
# "vec4" or "vec4 var_name"
re_anon_decl = "(?:(" + re_type + r")(?:\s+" + re_identifier + ")?)"
# list of anonymous declarations
re_anon_arg_list = "(" + re_anon_decl + r"(?:,\s*" + re_anon_decl + ")*)?"
# function prototype declaration like
# "vec4 function_name(float, float);"
re_func_prot = ("(" + re_type + r")\s+" + re_func_name + r"\((void|" +
re_anon_arg_list + r")\)\s*;")
def parse_function_signature(code):
"""
Return the name, arguments, and return type of the first function
definition found in *code*. Arguments are returned as [(type, name), ...].
"""
m = re.search(r"^\s*" + re_func_decl + r"\s*{", code, re.M)
if m is None:
print(code)
raise Exception("Failed to parse function signature. "
"Full code is printed above.")
rtype, name, args = m.groups()[:3]
if args == 'void' or args.strip() == '':
args = []
else:
args = [tuple(arg.strip().split(' ')) for arg in args.split(',')]
return name, args, rtype
def find_functions(code):
"""
Return a list of (name, arguments, return type) for all function
definition2 found in *code*. Arguments are returned as [(type, name), ...].
"""
regex = r"^\s*" + re_func_decl + r"\s*{"
funcs = []
while True:
m = re.search(regex, code, re.M)
if m is None:
return funcs
rtype, name, args = m.groups()[:3]
if args == 'void' or args.strip() == '':
args = []
else:
args = [tuple(arg.strip().split(' ')) for arg in args.split(',')]
funcs.append((name, args, rtype))
code = code[m.end():]
def find_prototypes(code):
"""
Return a list of signatures for each function prototype declared in *code*.
Format is [(name, [args], rtype), ...].
"""
prots = []
lines = code.split('\n')
for line in lines:
m = re.match(r"\s*" + re_func_prot, line)
if m is not None:
rtype, name, args = m.groups()[:3]
if args == 'void' or args.strip() == '':
args = []
else:
args = [tuple(arg.strip().split(' '))
for arg in args.split(',')]
prots.append((name, args, rtype))
return prots
def find_program_variables(code):
"""
Return a dict describing program variables::
{'var_name': ('uniform|attribute|varying', type), ...}
"""
vars = {}
lines = code.split('\n')
for line in lines:
m = re.match(r"\s*" + re_prog_var_declaration + r"\s*(=|;)", line)
if m is not None:
vtype, dtype, names = m.groups()[:3]
for name in names.split(','):
vars[name.strip()] = (vtype, dtype)
return vars
def find_template_variables(code):
"""
Return a list of template variables found in *code*.
"""
return re.findall(re_template_var, code)
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