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已同步 2025-08-07 23:14:03 +08:00
349 行
13 KiB
Python
349 行
13 KiB
Python
# Copyright (C) 2015-2019: The University of Edinburgh
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# Authors: Craig Warren and Antonis Giannopoulos
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#
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# This file is part of gprMax.
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#
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# gprMax is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# gprMax is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with gprMax. If not, see <http://www.gnu.org/licenses/>.
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from io import StringIO
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import logging
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import os
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import sys
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import gprMax.config as config
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from .exceptions import CmdInputError
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from .hash_cmds_geometry import process_geometrycmds
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from .hash_cmds_multiuse import process_multicmds
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from .hash_cmds_singleuse import process_singlecmds
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log = logging.getLogger(__name__)
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def process_python_include_code(inputfile, usernamespace):
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"""Looks for and processes any Python code found in the input file.
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It will ignore any lines that are comments, i.e. begin with a
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double hash (##), and any blank lines. It will also ignore any
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lines that do not begin with a hash (#) after it has processed
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Python commands. It will also process any include file commands
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and insert the contents of the included file at that location.
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Args:
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inputfile (object): File object for input file.
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usernamespace (dict): Namespace that can be accessed by user
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in any Python code blocks in input file.
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Returns:
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processedlines (list): Input commands after Python processing.
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"""
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# Strip out any newline characters and comments that must begin with double hashes
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inputlines = [line.rstrip() for line in inputfile if(not line.startswith('##') and line.rstrip('\n'))]
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# Rewind input file in preparation for any subsequent reading function
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inputfile.seek(0)
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# List to hold final processed commands
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processedlines = []
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x = 0
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while(x < len(inputlines)):
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# Process any Python code
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if(inputlines[x].startswith('#python:')):
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# String to hold Python code to be executed
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pythoncode = ''
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x += 1
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while not inputlines[x].startswith('#end_python:'):
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# Add all code in current code block to string
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pythoncode += inputlines[x] + '\n'
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x += 1
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if x == len(inputlines):
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raise CmdInputError('Cannot find the end of the Python code block, i.e. missing #end_python: command.')
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# Compile code for faster execution
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pythoncompiledcode = compile(pythoncode, '<string>', 'exec')
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# Redirect stdout to a text stream
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sys.stdout = result = StringIO()
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# Execute code block & make available only usernamespace
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exec(pythoncompiledcode, usernamespace)
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# String containing buffer of executed code
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codeout = result.getvalue().split('\n')
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result.close()
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# Reset stdio
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sys.stdout = sys.__stdout__
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# Separate commands from any other generated output
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hashcmds = []
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pythonout = []
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for line in codeout:
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if line.startswith('#'):
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hashcmds.append(line + '\n')
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elif line:
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pythonout.append(line)
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# Add commands to a list
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processedlines.extend(hashcmds)
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# Print any generated output that is not commands
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if pythonout:
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log.info(f'Python messages (from stdout/stderr): {pythonout}\n')
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# Add any other commands to list
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elif(inputlines[x].startswith('#')):
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# Add gprMax command to list
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inputlines[x] += ('\n')
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processedlines.append(inputlines[x])
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x += 1
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# Process any include file commands
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processedlines = process_include_files(processedlines, inputfile)
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return processedlines
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def process_include_files(hashcmds, inputfile):
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"""Looks for and processes any include file commands and insert
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the contents of the included file at that location.
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Args:
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hashcmds (list): Input commands.
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inputfile (object): File object for input file.
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Returns:
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processedincludecmds (list): Input commands after processing
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any include file commands.
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"""
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processedincludecmds = []
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x = 0
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while x < len(hashcmds):
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if hashcmds[x].startswith('#include_file:'):
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includefile = hashcmds[x].split()
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if len(includefile) != 2:
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raise CmdInputError('#include_file requires exactly one parameter')
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includefile = includefile[1]
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# See if file exists at specified path and if not try input file directory
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if not os.path.isfile(includefile):
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includefile = os.path.join(os.path.dirname(inputfile.name), includefile)
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with open(includefile, 'r') as f:
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# Strip out any newline characters and comments that must begin with double hashes
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includelines = [includeline.rstrip() + '\n' for includeline in f if(not includeline.startswith('##') and includeline.rstrip('\n'))]
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# Add lines from include file
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processedincludecmds.extend(includelines)
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else:
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processedincludecmds.append(hashcmds[x])
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x += 1
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return processedincludecmds
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def write_processed_file(processedlines, appendmodelnumber):
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"""Writes an input file after any Python code and include commands
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in the original input file have been processed.
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Args:
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processedlines (list): Input commands after after processing any
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Python code and include commands.
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appendmodelnumber (str): Text to append to filename.
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"""
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processedfile = (os.path.join(config.general['outputfilepath'],
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os.path.splitext(config.general['inputfilepath'])[0] +
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appendmodelnumber + '_processed.in'))
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with open(processedfile, 'w') as f:
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for item in processedlines:
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f.write('{}'.format(item))
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log.info(f'Written input commands, after processing any Python code and include commands, to file: {processedfile}\n')
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def check_cmd_names(processedlines, checkessential=True):
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"""Checks the validity of commands, i.e. are they gprMax commands,
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and that all essential commands are present.
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Args:
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processedlines (list): Input commands after Python processing.
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checkessential (boolean): Perform check to see that all essential commands are present.
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Returns:
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singlecmds (dict): Commands that can only occur once in the model.
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multiplecmds (dict): Commands that can have multiple instances in the model.
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geometry (list): Geometry commands in the model.
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"""
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# Dictionaries of available commands
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# Essential commands neccessary to run a gprMax model
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essentialcmds = ['#domain', '#dx_dy_dz', '#time_window']
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# Commands that there should only be one instance of in a model
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singlecmds = dict.fromkeys(['#domain', '#dx_dy_dz', '#time_window', '#title', '#messages', '#num_threads', '#time_step_stability_factor', '#pml_formulation', '#pml_cells', '#excitation_file', '#src_steps', '#rx_steps', '#output_dir'], None)
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# Commands that there can be multiple instances of in a model - these will be lists within the dictionary
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multiplecmds = {key: [] for key in ['#geometry_view', '#geometry_objects_write', '#material', '#soil_peplinski', '#add_dispersion_debye', '#add_dispersion_lorentz', '#add_dispersion_drude', '#waveform', '#voltage_source', '#hertzian_dipole', '#magnetic_dipole', '#transmission_line', '#rx', '#rx_array', '#snapshot', '#pml_cfs', '#include_file']}
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# Geometry object building commands that there can be multiple instances
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# of in a model - these will be lists within the dictionary
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geometrycmds = ['#geometry_objects_read', '#edge', '#plate', '#triangle', '#box', '#sphere', '#cylinder', '#cylindrical_sector', '#fractal_box', '#add_surface_roughness', '#add_surface_water', '#add_grass']
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# List to store all geometry object commands in order from input file
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geometry = []
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# Check if command names are valid, if essential commands are present, and
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# add command parameters to appropriate dictionary values or lists
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countessentialcmds = 0
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lindex = 0
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while(lindex < len(processedlines)):
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cmd = processedlines[lindex].split(':')
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cmdname = cmd[0]
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cmdparams = cmd[1]
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# Check if there is space between command name and parameters, i.e.
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# check first character of parameter string. Ignore case when there
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# are no parameters for a command, e.g. for #taguchi:
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if ' ' not in cmdparams[0] and len(cmdparams.strip('\n')) != 0:
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raise CmdInputError('There must be a space between the command name and parameters in ' + processedlines[lindex])
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# Check if command name is valid
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if cmdname not in essentialcmds and cmdname not in singlecmds and cmdname not in multiplecmds and cmdname not in geometrycmds:
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raise CmdInputError('Your input file contains an invalid command: ' + cmdname)
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# Count essential commands
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if cmdname in essentialcmds:
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countessentialcmds += 1
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# Assign command parameters as values to dictionary keys
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if cmdname in singlecmds:
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if singlecmds[cmdname] is None:
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singlecmds[cmdname] = cmd[1].strip(' \t\n')
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else:
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raise CmdInputError('You can only have a single instance of ' + cmdname + ' in your model')
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elif cmdname in multiplecmds:
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multiplecmds[cmdname].append(cmd[1].strip(' \t\n'))
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elif cmdname in geometrycmds:
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geometry.append(processedlines[lindex].strip(' \t\n'))
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lindex += 1
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if checkessential:
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if (countessentialcmds < len(essentialcmds)):
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raise CmdInputError('Your input file is missing essential commands required to run a model. Essential commands are: ' + ', '.join(essentialcmds))
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return singlecmds, multiplecmds, geometry
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def get_user_objects(processedlines, check=True):
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"""Make a list of all user objects.
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Args:
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processedlines (list): Input commands after Python processing.
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check (bool): Whether to check for essential commands or not.
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Returns:
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user_objs (list): All user objects.
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"""
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# Check validity of command names and that essential commands are present
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parsed_commands = check_cmd_names(processedlines, checkessential=check)
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# Process parameters for commands that can only occur once in the model
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single_user_objs = process_singlecmds(parsed_commands[0])
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# Process parameters for commands that can occur multiple times in
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# the model
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multiple_user_objs = process_multicmds(parsed_commands[1])
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# Process geometry commands in the order they were given
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geometry_user_objs = process_geometrycmds(parsed_commands[2])
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user_objs = single_user_objs + multiple_user_objs + geometry_user_objs
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return user_objs
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def parse_hash_commands(model_config, G, scene):
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"""Parse user hash commands and add them to the scene.
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Args:
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model_config (ModelConfig): Model level configuration object.
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G (FDTDGrid): Holds essential parameters describing a model.
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scene (Scene): Scene object.
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Returns:
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scene (Scene): Scene object.
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"""
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with open(config.sim_config.input_file_path) as inputfile:
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usernamespace = model_config.get_usernamespace()
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# Read input file and process any Python and include file commands
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processedlines = process_python_include_code(inputfile, usernamespace)
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# Print constants/variables in user-accessable namespace
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uservars = ''
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for key, value in sorted(usernamespace.items()):
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if key != '__builtins__':
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uservars += f'{key}: {value}, '
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log.info(f'Constants/variables used/available for Python scripting: {{{uservars[:-2]}}}\n')
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# Write a file containing the input commands after Python or include
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# file commands have been processed
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if config.sim_config.args.write_processed:
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write_processed_file(processedlines, model_config.appendmodelnumber, G)
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user_objs = get_user_objects(processedlines, check=True)
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for user_obj in user_objs:
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scene.add(user_obj)
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return scene
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class Capturing(list):
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"""Context manager to capture standard output stream."""
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# https://stackoverflow.com/questions/16571150/how-to-capture-stdout-output-from-a-python-function-call
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def __enter__(self):
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self._stdout = sys.stdout
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sys.stdout = self._stringio = StringIO()
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return self
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def __exit__(self, *args):
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self.extend(self._stringio.getvalue().splitlines())
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del self._stringio # free up some memory
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sys.stdout = self._stdout
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def user_libs_fn_to_scene_obj(f, *args, **kwargs):
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"""Function to convert library functions in the user_libs directory
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into geometry objects which can be added to the scene.
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"""
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with Capturing() as str_cmds:
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f(*args, **kwargs)
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user_objects = get_user_objects(str_cmds, check=False)
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return user_objects
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