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from mcstasscript.instr_reader.util import SectionReader
class UservarsReader(SectionReader):
"""
Reads the uservars section of a McStas instrument file and adds
the found parameters / functions / structs to the McStasScript
Instr instance. The information can also be written to a python
file for reproduction of a McStas instrument.
"""
def __init__(self, Instr, write_file, product_filename,
get_next_line, return_line):
super().__init__(Instr, write_file, product_filename,
get_next_line, return_line)
self.in_uservars_function = False
self.in_struct_definition = False
self.bracket_counter = 0
def read_uservars_line(self, line):
"""
Reads line of instrument uservars, returns bolean. If it encounters
the end of the uservars section, it returns False, otherwise True.
The contents of the uservars section is written to the McStasScript
Instr object.
"""
continue_uservars = True
# Remove comments
if "//" in line:
line = line.split("//", 1)[0]
# Remove %} and signify end if this is found
if "%}" in line:
continue_uservars = False
line = line.split("%}", 1)[0]
if "/*" in line:
line = line.split("/*", 1)[0].strip()
if self.in_uservars_function:
if "{" in line:
self.bracket_counter += 1
if "}" in line:
self.bracket_counter -= 1
if self.bracket_counter == 0:
self.in_uservars_function = False
self.Instr.append_uservars(line)
self._write_uservars_line(line)
# Check for functions
if ("(" in line and ";" not in line and " " in line.strip()
and not self.in_uservars_function):
# If in function, it will define a block
n_curly_brackets = line.count("{")
n_curly_brackets -= line.count("}")
while n_curly_brackets != 0 or ("{" not in line):
next_line = self.get_next_line()
line += next_line
n_curly_brackets = line.count("{")
n_curly_brackets -= line.count("}")
after_curly_bracket = line.split("}")[-1]
uservars_lines = line.split("\n")
for uservars_line in uservars_lines:
uservars_line = uservars_line.rstrip()
uservars_line = uservars_line.replace('\\n', "\\\\n")
uservars_line = uservars_line.replace('"', "\\\"")
self.Instr.append_uservars(uservars_line)
self._write_uservars_line(uservars_line)
line = after_curly_bracket
# Check for struct / function that returns struct
if line.strip().startswith("struct "):
# Can be a function returning struct or struct definition
# If struct definition, no parenthesis and ; after )
n_curly_brackets = line.count("{")
n_curly_brackets -= line.count("}")
# Add lines until end of block found
while n_curly_brackets != 0 or ("{" not in line):
next_line = self.get_next_line()
line += next_line
n_curly_brackets = line.count("{")
n_curly_brackets -= line.count("}")
if "{" in line:
before_curly_bracket = line.split("{", 1)[0]
if "(" in before_curly_bracket and ")" in before_curly_bracket:
# This is a function that returns a struct!
self.in_uservars_function = True
after_curly_bracket = line.split("}")[-1]
# if not in function, add until ; is found
while ";" not in after_curly_bracket and not self.in_uservars_function:
# It is surely a struct, find ;
line += self.get_next_line()
after_curly_bracket = line.split("}")[-1]
uservars_lines = line.split("\n")
for uservars_line in uservars_lines:
uservars_line = uservars_line.rstrip()
uservars_line = uservars_line.replace('\\n', "\\\\n")
uservars_line = uservars_line.replace('"', "\\\"")
self.Instr.append_uservars(uservars_line)
self._write_uservars_line(uservars_line)
if self.in_uservars_function:
line = line.split("}")[-1].strip()
else:
line = line.split(";")[-1].strip()
# if in function, stop now
self.in_uservars_function = False
# Grab defines
if line.strip().startswith("#define"):
# Include define statements as uservars append
line = line.rstrip()
line = line.replace('\\n', "\\\\n")
line = line.replace('"', "\\\"")
self.Instr.append_uservars(line)
self._write_uservars_line(line)
if "\n" in line:
line = line.strip("\n")
# Read single line parameter definitions
if ";" in line and not self.in_uservars_function:
# This line contains c statements
statements = line.split(";")
for statement in statements:
statement = statement.strip()
if (statement != "\n" and statement != " "
and len(statement) > 1):
self._read_uservars_statement(statement)
return continue_uservars
def _read_uservars_statement(self, statement):
"""
Reads single uservars statements, which can have multiple
variables.
"""
statement = statement.strip()
# Find type (same for all parameters in one statement)
this_type = statement.split(" ", 1)[0]
statement = statement.split(" ", 1)[1].strip()
if this_type == "const": # other c keywords to consider?
this_type += " " + statement.split(" ", 1)[0]
statement = statement.split(" ", 1)[1].strip()
# Check for bracket initialization of arrays
if "," in statement:
variables = statement.split(",")
fixed_variables = []
array_mode = False
for variable in variables:
if "{" not in variable and array_mode is False:
fixed_variables.append(variable)
elif "{" in variable:
temp_variable = variable + ","
array_mode = True
elif "}" not in variable:
temp_variable += variable + ","
else:
temp_variable += variable
fixed_variables.append(temp_variable)
array_mode = False
variables = fixed_variables
else:
# No commas means just one parameter
variables = [statement]
# Treat each variable independently
for variable in variables:
variable = variable.strip()
dynamic_size = False
kw_args = {}
if "=" in variable:
value = variable.split("=")[1].strip()
# remove the value part before proceeding
variable = variable.split("=")[0].strip()
if "{" in value:
# handle array as value
value = value.split("{")[1]
if "{" in value:
raise ValueError("Can not load arrays with larger"
+ "than 1 dimension yet.")
value = value.split("}")[0]
values = value.split(",")
return_value = []
for val in values:
return_value.append(float(val))
else:
try:
return_value = float(value)
except:
value = value.replace('"', "\\\"")
#return_value = '"' + value + '"'
return_value = value
kw_args["value"] = return_value
# Handle array
if "[" in variable:
array_sizes = []
array_size_strings = variable.split("[")
# remove the array size part before proceeding
variable = variable.split("[", 1)[0].strip()
for array_size_string in array_size_strings:
if "]" in array_size_string:
this_size = array_size_string.split("]")[0]
try:
# Size uservarsd normally
array_sizes.append(int(this_size))
except:
# No size uservarsd means the size is automatic
dynamic_size = True
if len(array_sizes) > 1:
raise ValueError("Can not handle arrays with larger"
+ " than 1 dimension yet")
if not dynamic_size:
kw_args["array"] = array_sizes[0]
if dynamic_size:
# McStasScript needs size of array, so it is found manually
kw_args["array"] = len(kw_args["value"])
# value, array and typeremoved, all that remians is the name
variable_name = variable
self.Instr.add_user_var(this_type, variable_name, **kw_args)
# Also write it to a file?
write_string = []
write_string.append(self.instr_name)
write_string.append(".add_user_var(")
write_string.append("\"" + this_type + "\"")
write_string.append(", ")
write_string.append("\"" + variable_name + "\"")
write_string.append(self._kw_to_string(kw_args))
write_string.append(")\n")
# Write uservars parameter to python file
self._write_to_file(write_string)
def _write_uservars_line(self, string):
string = string.rstrip()
write_string = []
write_string.append(self.instr_name)
write_string.append(".append_uservars(")
write_string.append("\"" + string + "\"")
write_string.append(")\n")
self._write_to_file(write_string)
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