1 | """ |
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2 | This is the base file reader class most file readers should inherit from. |
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3 | All generic functionality required for a file loader/reader is built into this |
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4 | class |
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5 | """ |
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6 | |
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7 | import os |
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8 | import sys |
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9 | import math |
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10 | import logging |
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11 | from abc import abstractmethod |
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12 | |
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13 | import numpy as np |
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14 | from .loader_exceptions import NoKnownLoaderException, FileContentsException,\ |
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15 | DataReaderException, DefaultReaderException |
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16 | from .data_info import Data1D, Data2D, DataInfo, plottable_1D, plottable_2D,\ |
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17 | combine_data_info_with_plottable |
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18 | from sas.sascalc.data_util.nxsunit import Converter |
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19 | |
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20 | logger = logging.getLogger(__name__) |
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21 | |
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22 | if sys.version_info[0] < 3: |
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23 | def decode(s): |
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24 | return s |
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25 | else: |
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26 | def decode(s): |
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27 | return s.decode() if isinstance(s, bytes) else s |
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28 | |
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29 | # Data 1D fields for iterative purposes |
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30 | FIELDS_1D = ('x', 'y', 'dx', 'dy', 'dxl', 'dxw') |
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31 | # Data 2D fields for iterative purposes |
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32 | FIELDS_2D = ('data', 'qx_data', 'qy_data', 'q_data', 'err_data', |
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33 | 'dqx_data', 'dqy_data', 'mask') |
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34 | DEPRECATION_MESSAGE = ("\rThe extension of this file suggests the data set migh" |
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35 | "t not be fully reduced. Support for the reader associat" |
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36 | "ed with this file type has been removed. An attempt to " |
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37 | "load the file was made, but, should it be successful, " |
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38 | "SasView cannot guarantee the accuracy of the data.") |
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39 | |
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40 | |
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41 | class FileReader(object): |
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42 | # String to describe the type of data this reader can load |
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43 | type_name = "ASCII" |
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44 | # Wildcards to display |
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45 | type = ["Text files (*.txt|*.TXT)"] |
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46 | # List of allowed extensions |
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47 | ext = ['.txt'] |
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48 | # Deprecated extensions |
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49 | deprecated_extensions = ['.asc', '.nxs'] |
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50 | # Bypass extension check and try to load anyway |
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51 | allow_all = False |
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52 | # Able to import the unit converter |
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53 | has_converter = True |
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54 | # Default value of zero |
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55 | _ZERO = 1e-16 |
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56 | |
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57 | def __init__(self): |
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58 | # List of Data1D and Data2D objects to be sent back to data_loader |
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59 | self.output = [] |
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60 | # Current plottable_(1D/2D) object being loaded in |
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61 | self.current_dataset = None |
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62 | # Current DataInfo object being loaded in |
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63 | self.current_datainfo = None |
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64 | # File path sent to reader |
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65 | self.filepath = None |
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66 | # Open file handle |
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67 | self.f_open = None |
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68 | |
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69 | def read(self, filepath): |
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70 | """ |
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71 | Basic file reader |
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72 | |
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73 | :param filepath: The full or relative path to a file to be loaded |
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74 | """ |
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75 | self.filepath = filepath |
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76 | if os.path.isfile(filepath): |
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77 | basename, extension = os.path.splitext(os.path.basename(filepath)) |
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78 | self.extension = extension.lower() |
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79 | # If the file type is not allowed, return nothing |
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80 | if self.extension in self.ext or self.allow_all: |
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81 | # Try to load the file, but raise an error if unable to. |
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82 | try: |
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83 | self.f_open = open(filepath, 'rb') |
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84 | self.get_file_contents() |
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85 | |
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86 | except DataReaderException as e: |
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87 | self.handle_error_message(e.message) |
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88 | except OSError as e: |
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89 | # If the file cannot be opened |
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90 | msg = "Unable to open file: {}\n".format(filepath) |
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91 | msg += e.message |
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92 | self.handle_error_message(msg) |
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93 | finally: |
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94 | # Close the file handle if it is open |
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95 | if not self.f_open.closed: |
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96 | self.f_open.close() |
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97 | if any(filepath.lower().endswith(ext) for ext in |
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98 | self.deprecated_extensions): |
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99 | self.handle_error_message(DEPRECATION_MESSAGE) |
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100 | if len(self.output) > 0: |
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101 | # Sort the data that's been loaded |
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102 | self.convert_data_units() |
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103 | self.sort_data() |
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104 | else: |
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105 | msg = "Unable to find file at: {}\n".format(filepath) |
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106 | msg += "Please check your file path and try again." |
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107 | self.handle_error_message(msg) |
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108 | |
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109 | # Return a list of parsed entries that data_loader can manage |
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110 | final_data = self.output |
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111 | self.reset_state() |
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112 | return final_data |
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113 | |
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114 | def reset_state(self): |
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115 | """ |
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116 | Resets the class state to a base case when loading a new data file so previous |
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117 | data files do not appear a second time |
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118 | """ |
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119 | self.current_datainfo = None |
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120 | self.current_dataset = None |
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121 | self.filepath = None |
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122 | self.ind = None |
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123 | self.output = [] |
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124 | |
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125 | def nextline(self): |
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126 | """ |
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127 | Returns the next line in the file as a string. |
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128 | """ |
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129 | #return self.f_open.readline() |
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130 | return decode(self.f_open.readline()) |
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131 | |
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132 | def nextlines(self): |
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133 | """ |
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134 | Returns the next line in the file as a string. |
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135 | """ |
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136 | for line in self.f_open: |
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137 | #yield line |
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138 | yield decode(line) |
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139 | |
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140 | def readall(self): |
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141 | """ |
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142 | Returns the entire file as a string. |
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143 | """ |
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144 | return decode(self.f_open.read()) |
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145 | |
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146 | def handle_error_message(self, msg): |
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147 | """ |
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148 | Generic error handler to add an error to the current datainfo to |
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149 | propagate the error up the error chain. |
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150 | :param msg: Error message |
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151 | """ |
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152 | if len(self.output) > 0: |
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153 | self.output[-1].errors.append(msg) |
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154 | elif isinstance(self.current_datainfo, DataInfo): |
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155 | self.current_datainfo.errors.append(msg) |
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156 | else: |
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157 | logger.warning(msg) |
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158 | raise NoKnownLoaderException(msg) |
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159 | |
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160 | def send_to_output(self): |
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161 | """ |
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162 | Helper that automatically combines the info and set and then appends it |
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163 | to output |
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164 | """ |
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165 | data_obj = combine_data_info_with_plottable(self.current_dataset, |
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166 | self.current_datainfo) |
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167 | self.output.append(data_obj) |
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168 | |
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169 | def sort_data(self): |
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170 | """ |
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171 | Sort 1D data along the X axis for consistency |
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172 | """ |
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173 | for data in self.output: |
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174 | if isinstance(data, Data1D): |
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175 | # Normalize the units for |
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176 | data.x_unit = self.format_unit(data.x_unit) |
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177 | data._xunit = data.x_unit |
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178 | data.y_unit = self.format_unit(data.y_unit) |
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179 | data._yunit = data.y_unit |
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180 | # Sort data by increasing x and remove 1st point |
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181 | ind = np.lexsort((data.y, data.x)) |
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182 | data.x = self._reorder_1d_array(data.x, ind) |
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183 | data.y = self._reorder_1d_array(data.y, ind) |
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184 | if data.dx is not None: |
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185 | if len(data.dx) == 0: |
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186 | data.dx = None |
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187 | continue |
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188 | data.dx = self._reorder_1d_array(data.dx, ind) |
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189 | if data.dxl is not None: |
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190 | data.dxl = self._reorder_1d_array(data.dxl, ind) |
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191 | if data.dxw is not None: |
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192 | data.dxw = self._reorder_1d_array(data.dxw, ind) |
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193 | if data.dy is not None: |
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194 | if len(data.dy) == 0: |
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195 | data.dy = None |
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196 | continue |
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197 | data.dy = self._reorder_1d_array(data.dy, ind) |
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198 | if data.lam is not None: |
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199 | data.lam = self._reorder_1d_array(data.lam, ind) |
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200 | if data.dlam is not None: |
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201 | data.dlam = self._reorder_1d_array(data.dlam, ind) |
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202 | data = self._remove_nans_in_data(data) |
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203 | if len(data.x) > 0: |
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204 | data.xmin = np.min(data.x) |
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205 | data.xmax = np.max(data.x) |
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206 | data.ymin = np.min(data.y) |
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207 | data.ymax = np.max(data.y) |
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208 | elif isinstance(data, Data2D): |
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209 | # Normalize the units for |
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210 | data.Q_unit = self.format_unit(data.Q_unit) |
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211 | data.I_unit = self.format_unit(data.I_unit) |
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212 | data._xunit = data.Q_unit |
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213 | data._yunit = data.Q_unit |
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214 | data._zunit = data.I_unit |
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215 | data.data = data.data.astype(np.float64) |
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216 | data.qx_data = data.qx_data.astype(np.float64) |
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217 | data.xmin = np.min(data.qx_data) |
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218 | data.xmax = np.max(data.qx_data) |
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219 | data.qy_data = data.qy_data.astype(np.float64) |
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220 | data.ymin = np.min(data.qy_data) |
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221 | data.ymax = np.max(data.qy_data) |
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222 | data.q_data = np.sqrt(data.qx_data * data.qx_data |
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223 | + data.qy_data * data.qy_data) |
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224 | if data.err_data is not None: |
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225 | data.err_data = data.err_data.astype(np.float64) |
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226 | if data.dqx_data is not None: |
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227 | data.dqx_data = data.dqx_data.astype(np.float64) |
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228 | if data.dqy_data is not None: |
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229 | data.dqy_data = data.dqy_data.astype(np.float64) |
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230 | if data.mask is not None: |
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231 | data.mask = data.mask.astype(dtype=bool) |
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232 | |
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233 | n_rows, n_cols = data.data.shape |
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234 | data.y_bins = data.qy_data[0::int(n_cols)] |
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235 | data.x_bins = data.qx_data[:int(n_cols)] |
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236 | data.data = data.data.flatten() |
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237 | data = self._remove_nans_in_data(data) |
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238 | if len(data.data) > 0: |
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239 | data.xmin = np.min(data.qx_data) |
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240 | data.xmax = np.max(data.qx_data) |
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241 | data.ymin = np.min(data.qy_data) |
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242 | data.ymax = np.max(data.qx_data) |
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243 | |
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244 | @staticmethod |
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245 | def _reorder_1d_array(array, ind): |
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246 | """ |
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247 | Reorders a 1D array based on the indices passed as ind |
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248 | :param array: Array to be reordered |
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249 | :param ind: Indices used to reorder array |
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250 | :return: reordered array |
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251 | """ |
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252 | array = np.asarray(array, dtype=np.float64) |
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253 | return array[ind] |
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254 | |
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255 | @staticmethod |
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256 | def _remove_nans_in_data(data): |
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257 | """ |
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258 | Remove data points where nan is loaded |
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259 | :param data: 1D or 2D data object |
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260 | :return: data with nan points removed |
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261 | """ |
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262 | if isinstance(data, Data1D): |
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263 | fields = FIELDS_1D |
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264 | elif isinstance(data, Data2D): |
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265 | fields = FIELDS_2D |
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266 | else: |
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267 | return data |
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268 | # Make array of good points - all others will be removed |
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269 | good = np.isfinite(getattr(data, fields[0])) |
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270 | for name in fields[1:]: |
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271 | array = getattr(data, name) |
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272 | if array is not None: |
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273 | # Update good points only if not already changed |
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274 | good &= np.isfinite(array) |
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275 | if not np.all(good): |
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276 | for name in fields: |
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277 | array = getattr(data, name) |
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278 | if array is not None: |
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279 | setattr(data, name, array[good]) |
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280 | return data |
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281 | |
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282 | @staticmethod |
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283 | def set_default_1d_units(data): |
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284 | """ |
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285 | Set the x and y axes to the default 1D units |
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286 | :param data: 1D data set |
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287 | :return: |
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288 | """ |
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289 | data.xaxis(r"\rm{Q}", '1/A') |
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290 | data.yaxis(r"\rm{Intensity}", "1/cm") |
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291 | return data |
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292 | |
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293 | @staticmethod |
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294 | def set_default_2d_units(data): |
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295 | """ |
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296 | Set the x and y axes to the default 2D units |
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297 | :param data: 2D data set |
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298 | :return: |
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299 | """ |
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300 | data.xaxis("\\rm{Q_{x}}", '1/A') |
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301 | data.yaxis("\\rm{Q_{y}}", '1/A') |
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302 | data.zaxis("\\rm{Intensity}", "1/cm") |
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303 | return data |
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304 | |
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305 | def convert_data_units(self, default_q_unit="1/A", default_i_unit="1/cm"): |
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306 | """ |
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307 | Converts al; data to the sasview default of units of A^{-1} for Q and |
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308 | cm^{-1} for I. |
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309 | :param default_q_unit: The default Q unit used by Sasview |
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310 | :param default_i_unit: The default I unit used by Sasview |
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311 | """ |
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312 | new_output = [] |
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313 | for data in self.output: |
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314 | if data.isSesans: |
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315 | new_output.append(data) |
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316 | continue |
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317 | file_x_unit = data._xunit |
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318 | data_conv_x = Converter(file_x_unit) |
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319 | file_y_unit = data._yunit |
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320 | data_conv_y = Converter(file_y_unit) |
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321 | if isinstance(data, Data1D): |
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322 | try: |
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323 | data.x = data_conv_x(data.x, units=default_q_unit) |
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324 | data._xunit = default_q_unit |
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325 | data.x_unit = default_q_unit |
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326 | if data.dx is not None: |
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327 | data.dx = data_conv_x(data.dx, units=default_q_unit) |
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328 | if data.dxl is not None: |
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329 | data.dxl = data_conv_x(data.dxl, units=default_q_unit) |
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330 | if data.dxw is not None: |
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331 | data.dxw = data_conv_x(data.dxw, units=default_q_unit) |
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332 | except KeyError: |
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333 | message = "Unable to convert Q units from {0} to 1/A." |
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334 | message.format(default_q_unit) |
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335 | data.errors.append(message) |
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336 | try: |
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337 | data.y = data_conv_y(data.y, units=default_i_unit) |
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338 | data._yunit = default_i_unit |
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339 | data.y_unit = default_i_unit |
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340 | if data.dy is not None: |
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341 | data.dy = data_conv_y(data.dy, units=default_i_unit) |
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342 | except KeyError: |
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343 | message = "Unable to convert I units from {0} to 1/cm." |
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344 | message.format(default_q_unit) |
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345 | data.errors.append(message) |
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346 | elif isinstance(data, Data2D): |
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347 | try: |
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348 | data.qx_data = data_conv_x(data.qx_data, |
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349 | units=default_q_unit) |
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350 | if data.dqx_data is not None: |
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351 | data.dqx_data = data_conv_x(data.dqx_data, |
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352 | units=default_q_unit) |
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353 | data.qy_data = data_conv_y(data.qy_data, |
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354 | units=default_q_unit) |
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355 | if data.dqy_data is not None: |
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356 | data.dqy_data = data_conv_y(data.dqy_data, |
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357 | units=default_q_unit) |
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358 | except KeyError: |
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359 | message = "Unable to convert Q units from {0} to 1/A." |
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360 | message.format(default_q_unit) |
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361 | data.errors.append(message) |
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362 | try: |
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363 | file_z_unit = data._zunit |
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364 | data_conv_z = Converter(file_z_unit) |
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365 | data.data = data_conv_z(data.data, units=default_i_unit) |
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366 | if data.err_data is not None: |
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367 | data.err_data = data_conv_z(data.err_data, |
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368 | units=default_i_unit) |
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369 | except KeyError: |
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370 | message = "Unable to convert I units from {0} to 1/cm." |
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371 | message.format(default_q_unit) |
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372 | data.errors.append(message) |
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373 | else: |
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374 | # TODO: Throw error of some sort... |
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375 | pass |
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376 | new_output.append(data) |
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377 | self.output = new_output |
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378 | |
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379 | def format_unit(self, unit=None): |
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380 | """ |
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381 | Format units a common way |
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382 | :param unit: |
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383 | :return: |
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384 | """ |
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385 | if unit: |
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386 | split = unit.split("/") |
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387 | if len(split) == 1: |
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388 | return unit |
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389 | elif split[0] == '1': |
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390 | return "{0}^".format(split[1]) + "{-1}" |
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391 | else: |
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392 | return "{0}*{1}^".format(split[0], split[1]) + "{-1}" |
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393 | |
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394 | def set_all_to_none(self): |
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395 | """ |
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396 | Set all mutable values to None for error handling purposes |
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397 | """ |
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398 | self.current_dataset = None |
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399 | self.current_datainfo = None |
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400 | self.output = [] |
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401 | |
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402 | def data_cleanup(self): |
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403 | """ |
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404 | Clean up the data sets and refresh everything |
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405 | :return: None |
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406 | """ |
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407 | self.remove_empty_q_values() |
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408 | self.send_to_output() # Combine datasets with DataInfo |
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409 | self.current_datainfo = DataInfo() # Reset DataInfo |
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410 | |
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411 | def remove_empty_q_values(self): |
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412 | """ |
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413 | Remove any point where Q == 0 |
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414 | """ |
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415 | if isinstance(self.current_dataset, plottable_1D): |
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416 | # Booleans for resolutions |
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417 | has_error_dx = self.current_dataset.dx is not None |
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418 | has_error_dxl = self.current_dataset.dxl is not None |
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419 | has_error_dxw = self.current_dataset.dxw is not None |
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420 | has_error_dy = self.current_dataset.dy is not None |
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421 | # Create arrays of zeros for non-existent resolutions |
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422 | if has_error_dxw and not has_error_dxl: |
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423 | array_size = self.current_dataset.dxw.size - 1 |
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424 | self.current_dataset.dxl = np.append(self.current_dataset.dxl, |
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425 | np.zeros([array_size])) |
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426 | has_error_dxl = True |
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427 | elif has_error_dxl and not has_error_dxw: |
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428 | array_size = self.current_dataset.dxl.size - 1 |
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429 | self.current_dataset.dxw = np.append(self.current_dataset.dxw, |
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430 | np.zeros([array_size])) |
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431 | has_error_dxw = True |
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432 | elif not has_error_dxl and not has_error_dxw and not has_error_dx: |
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433 | array_size = self.current_dataset.x.size - 1 |
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434 | self.current_dataset.dx = np.append(self.current_dataset.dx, |
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435 | np.zeros([array_size])) |
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436 | has_error_dx = True |
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437 | if not has_error_dy: |
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438 | array_size = self.current_dataset.y.size - 1 |
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439 | self.current_dataset.dy = np.append(self.current_dataset.dy, |
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440 | np.zeros([array_size])) |
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441 | has_error_dy = True |
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442 | |
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443 | # Remove points where q = 0 |
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444 | x = self.current_dataset.x |
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445 | self.current_dataset.x = self.current_dataset.x[x != 0] |
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446 | self.current_dataset.y = self.current_dataset.y[x != 0] |
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447 | if has_error_dy: |
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448 | self.current_dataset.dy = self.current_dataset.dy[x != 0] |
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449 | if has_error_dx: |
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450 | self.current_dataset.dx = self.current_dataset.dx[x != 0] |
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451 | if has_error_dxl: |
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452 | self.current_dataset.dxl = self.current_dataset.dxl[x != 0] |
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453 | if has_error_dxw: |
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454 | self.current_dataset.dxw = self.current_dataset.dxw[x != 0] |
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455 | elif isinstance(self.current_dataset, plottable_2D): |
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456 | has_error_dqx = self.current_dataset.dqx_data is not None |
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457 | has_error_dqy = self.current_dataset.dqy_data is not None |
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458 | has_error_dy = self.current_dataset.err_data is not None |
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459 | has_mask = self.current_dataset.mask is not None |
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460 | x = self.current_dataset.qx_data |
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461 | self.current_dataset.data = self.current_dataset.data[x != 0] |
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462 | self.current_dataset.qx_data = self.current_dataset.qx_data[x != 0] |
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463 | self.current_dataset.qy_data = self.current_dataset.qy_data[x != 0] |
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464 | self.current_dataset.q_data = np.sqrt( |
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465 | np.square(self.current_dataset.qx_data) + np.square( |
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466 | self.current_dataset.qy_data)) |
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467 | if has_error_dy: |
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468 | self.current_dataset.err_data = self.current_dataset.err_data[ |
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469 | x != 0] |
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470 | if has_error_dqx: |
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471 | self.current_dataset.dqx_data = self.current_dataset.dqx_data[ |
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472 | x != 0] |
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473 | if has_error_dqy: |
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474 | self.current_dataset.dqy_data = self.current_dataset.dqy_data[ |
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475 | x != 0] |
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476 | if has_mask: |
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477 | self.current_dataset.mask = self.current_dataset.mask[x != 0] |
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478 | |
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479 | def reset_data_list(self, no_lines=0): |
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480 | """ |
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481 | Reset the plottable_1D object |
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482 | """ |
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483 | # Initialize data sets with arrays the maximum possible size |
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484 | x = np.zeros(no_lines) |
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485 | y = np.zeros(no_lines) |
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486 | dx = np.zeros(no_lines) |
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487 | dy = np.zeros(no_lines) |
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488 | self.current_dataset = plottable_1D(x, y, dx, dy) |
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489 | |
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490 | @staticmethod |
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491 | def splitline(line): |
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492 | """ |
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493 | Splits a line into pieces based on common delimiters |
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494 | :param line: A single line of text |
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495 | :return: list of values |
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496 | """ |
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497 | # Initial try for CSV (split on ,) |
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498 | toks = line.split(',') |
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499 | # Now try SCSV (split on ;) |
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500 | if len(toks) < 2: |
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501 | toks = line.split(';') |
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502 | # Now go for whitespace |
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503 | if len(toks) < 2: |
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504 | toks = line.split() |
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505 | return toks |
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506 | |
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507 | @abstractmethod |
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508 | def get_file_contents(self): |
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509 | """ |
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510 | Reader specific class to access the contents of the file |
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511 | All reader classes that inherit from FileReader must implement |
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512 | """ |
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513 | pass |
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