1 | """ |
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2 | ASCII reader |
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3 | """ |
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4 | ############################################################################ |
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5 | #This software was developed by the University of Tennessee as part of the |
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6 | #Distributed Data Analysis of Neutron Scattering Experiments (DANSE) |
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7 | #project funded by the US National Science Foundation. |
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8 | #If you use DANSE applications to do scientific research that leads to |
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9 | #publication, we ask that you acknowledge the use of the software with the |
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10 | #following sentence: |
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11 | #This work benefited from DANSE software developed under NSF award DMR-0520547. |
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12 | #copyright 2008, University of Tennessee |
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13 | ############################################################################# |
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14 | |
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15 | |
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16 | import numpy |
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17 | import os |
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18 | from sas.sascalc.dataloader.data_info import Data1D |
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19 | |
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20 | # Check whether we have a converter available |
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21 | has_converter = True |
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22 | try: |
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23 | from sas.sascalc.data_util.nxsunit import Converter |
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24 | except: |
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25 | has_converter = False |
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26 | _ZERO = 1e-16 |
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27 | |
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28 | |
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29 | class Reader: |
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30 | """ |
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31 | Class to load ascii files (2, 3 or 4 columns). |
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32 | """ |
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33 | ## File type |
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34 | type_name = "ASCII" |
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35 | |
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36 | ## Wildcards |
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37 | type = ["ASCII files (*.txt)|*.txt", |
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38 | "ASCII files (*.dat)|*.dat", |
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39 | "ASCII files (*.abs)|*.abs", |
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40 | "CSV files (*.csv)|*.csv"] |
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41 | ## List of allowed extensions |
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42 | ext = ['.txt', '.TXT', '.dat', '.DAT', '.abs', '.ABS', 'csv', 'CSV'] |
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43 | |
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44 | ## Flag to bypass extension check |
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45 | allow_all = True |
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46 | |
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47 | def read(self, path): |
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48 | """ |
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49 | Load data file |
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50 | |
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51 | :param path: file path |
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52 | |
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53 | :return: Data1D object, or None |
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54 | |
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55 | :raise RuntimeError: when the file can't be opened |
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56 | :raise ValueError: when the length of the data vectors are inconsistent |
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57 | """ |
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58 | if os.path.isfile(path): |
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59 | basename = os.path.basename(path) |
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60 | _, extension = os.path.splitext(basename) |
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61 | if self.allow_all or extension.lower() in self.ext: |
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62 | try: |
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63 | # Read in binary mode since GRASP frequently has no-ascii |
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64 | # characters that brakes the open operation |
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65 | input_f = open(path,'rb') |
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66 | except: |
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67 | raise RuntimeError, "ascii_reader: cannot open %s" % path |
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68 | buff = input_f.read() |
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69 | lines = buff.splitlines() |
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70 | |
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71 | x = numpy.zeros(0) |
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72 | y = numpy.zeros(0) |
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73 | dy = numpy.zeros(0) |
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74 | dx = numpy.zeros(0) |
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75 | |
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76 | #temp. space to sort data |
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77 | tx = numpy.zeros(0) |
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78 | ty = numpy.zeros(0) |
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79 | tdy = numpy.zeros(0) |
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80 | tdx = numpy.zeros(0) |
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81 | |
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82 | output = Data1D(x, y, dy=dy, dx=dx) |
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83 | self.filename = output.filename = basename |
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84 | |
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85 | data_conv_q = None |
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86 | data_conv_i = None |
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87 | |
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88 | if has_converter == True and output.x_unit != '1/A': |
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89 | data_conv_q = Converter('1/A') |
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90 | # Test it |
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91 | data_conv_q(1.0, output.x_unit) |
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92 | |
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93 | if has_converter == True and output.y_unit != '1/cm': |
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94 | data_conv_i = Converter('1/cm') |
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95 | # Test it |
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96 | data_conv_i(1.0, output.y_unit) |
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97 | |
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98 | # The first good line of data will define whether |
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99 | # we have 2-column or 3-column ascii |
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100 | has_error_dx = None |
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101 | has_error_dy = None |
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102 | |
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103 | #Initialize counters for data lines and header lines. |
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104 | is_data = False # Has more than 5 lines |
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105 | # More than "5" lines of data is considered as actual |
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106 | # data unless that is the only data |
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107 | mum_data_lines = 5 |
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108 | # To count # of current data candidate lines |
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109 | i = -1 |
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110 | # To count total # of previous data candidate lines |
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111 | i1 = -1 |
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112 | # To count # of header lines |
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113 | j = -1 |
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114 | # Helps to count # of header lines |
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115 | j1 = -1 |
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116 | #minimum required number of columns of data; ( <= 4). |
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117 | lentoks = 2 |
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118 | for line in lines: |
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119 | # Initial try for CSV (split on ,) |
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120 | toks = line.split(',') |
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121 | # Now try SCSV (split on ;) |
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122 | if len(toks) < 2: |
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123 | toks = line.split(';') |
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124 | # Now go for whitespace |
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125 | if len(toks) < 2: |
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126 | toks = line.split() |
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127 | try: |
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128 | #Make sure that all columns are numbers. |
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129 | for colnum in range(len(toks)): |
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130 | float(toks[colnum]) |
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131 | |
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132 | _x = float(toks[0]) |
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133 | _y = float(toks[1]) |
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134 | |
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135 | #Reset the header line counters |
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136 | if j == j1: |
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137 | j = 0 |
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138 | j1 = 0 |
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139 | |
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140 | if i > 1: |
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141 | is_data = True |
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142 | |
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143 | if data_conv_q is not None: |
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144 | _x = data_conv_q(_x, units=output.x_unit) |
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145 | |
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146 | if data_conv_i is not None: |
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147 | _y = data_conv_i(_y, units=output.y_unit) |
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148 | |
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149 | # If we have an extra token, check |
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150 | # whether it can be interpreted as a |
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151 | # third column. |
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152 | _dy = None |
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153 | if len(toks) > 2: |
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154 | try: |
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155 | _dy = float(toks[2]) |
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156 | |
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157 | if data_conv_i is not None: |
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158 | _dy = data_conv_i(_dy, units=output.y_unit) |
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159 | |
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160 | except: |
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161 | # The third column is not a float, skip it. |
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162 | pass |
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163 | |
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164 | # If we haven't set the 3rd column |
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165 | # flag, set it now. |
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166 | if has_error_dy == None: |
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167 | has_error_dy = False if _dy == None else True |
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168 | |
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169 | #Check for dx |
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170 | _dx = None |
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171 | if len(toks) > 3: |
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172 | try: |
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173 | _dx = float(toks[3]) |
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174 | |
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175 | if data_conv_i is not None: |
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176 | _dx = data_conv_i(_dx, units=output.x_unit) |
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177 | |
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178 | except: |
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179 | # The 4th column is not a float, skip it. |
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180 | pass |
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181 | |
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182 | # If we haven't set the 3rd column |
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183 | # flag, set it now. |
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184 | if has_error_dx == None: |
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185 | has_error_dx = False if _dx == None else True |
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186 | |
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187 | #After talked with PB, we decided to take care of only |
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188 | # 4 columns of data for now. |
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189 | #number of columns in the current line |
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190 | #To remember the # of columns in the current |
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191 | #line of data |
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192 | new_lentoks = len(toks) |
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193 | |
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194 | #If the previous columns not equal to the current, |
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195 | #mark the previous as non-data and reset the dependents. |
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196 | if lentoks != new_lentoks: |
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197 | if is_data == True: |
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198 | break |
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199 | else: |
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200 | i = -1 |
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201 | i1 = 0 |
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202 | j = -1 |
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203 | j1 = -1 |
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204 | |
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205 | #Delete the previously stored lines of data candidates |
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206 | # if is not data. |
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207 | if i < 0 and -1 < i1 < mum_data_lines and \ |
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208 | is_data == False: |
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209 | try: |
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210 | x = numpy.zeros(0) |
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211 | y = numpy.zeros(0) |
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212 | except: |
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213 | pass |
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214 | |
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215 | x = numpy.append(x, _x) |
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216 | y = numpy.append(y, _y) |
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217 | |
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218 | if has_error_dy == True: |
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219 | #Delete the previously stored lines of |
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220 | # data candidates if is not data. |
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221 | if i < 0 and -1 < i1 < mum_data_lines and \ |
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222 | is_data == False: |
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223 | try: |
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224 | dy = numpy.zeros(0) |
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225 | except: |
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226 | pass |
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227 | dy = numpy.append(dy, _dy) |
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228 | |
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229 | if has_error_dx == True: |
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230 | #Delete the previously stored lines of |
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231 | # data candidates if is not data. |
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232 | if i < 0 and -1 < i1 < mum_data_lines and \ |
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233 | is_data == False: |
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234 | try: |
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235 | dx = numpy.zeros(0) |
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236 | except: |
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237 | pass |
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238 | dx = numpy.append(dx, _dx) |
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239 | |
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240 | #Same for temp. |
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241 | #Delete the previously stored lines of data candidates |
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242 | # if is not data. |
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243 | if i < 0 and -1 < i1 < mum_data_lines and\ |
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244 | is_data == False: |
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245 | try: |
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246 | tx = numpy.zeros(0) |
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247 | ty = numpy.zeros(0) |
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248 | except: |
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249 | pass |
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250 | |
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251 | tx = numpy.append(tx, _x) |
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252 | ty = numpy.append(ty, _y) |
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253 | |
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254 | if has_error_dy == True: |
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255 | #Delete the previously stored lines of |
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256 | # data candidates if is not data. |
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257 | if i < 0 and -1 < i1 < mum_data_lines and \ |
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258 | is_data == False: |
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259 | try: |
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260 | tdy = numpy.zeros(0) |
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261 | except: |
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262 | pass |
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263 | tdy = numpy.append(tdy, _dy) |
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264 | if has_error_dx == True: |
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265 | #Delete the previously stored lines of |
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266 | # data candidates if is not data. |
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267 | if i < 0 and -1 < i1 < mum_data_lines and \ |
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268 | is_data == False: |
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269 | try: |
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270 | tdx = numpy.zeros(0) |
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271 | except: |
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272 | pass |
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273 | tdx = numpy.append(tdx, _dx) |
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274 | |
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275 | #reset i1 and flag lentoks for the next |
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276 | if lentoks < new_lentoks: |
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277 | if is_data == False: |
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278 | i1 = -1 |
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279 | #To remember the # of columns on the current line |
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280 | # for the next line of data |
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281 | lentoks = len(toks) |
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282 | |
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283 | #Reset # of header lines and counts # |
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284 | # of data candidate lines |
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285 | if j == 0 and j1 == 0: |
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286 | i1 = i + 1 |
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287 | i += 1 |
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288 | except: |
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289 | # It is data and meet non - number, then stop reading |
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290 | if is_data == True: |
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291 | break |
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292 | lentoks = 2 |
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293 | #Counting # of header lines |
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294 | j += 1 |
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295 | if j == j1 + 1: |
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296 | j1 = j |
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297 | else: |
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298 | j = -1 |
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299 | #Reset # of lines of data candidates |
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300 | i = -1 |
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301 | |
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302 | # Couldn't parse this line, skip it |
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303 | pass |
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304 | |
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305 | input_f.close() |
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306 | # Sanity check |
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307 | if has_error_dy == True and not len(y) == len(dy): |
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308 | msg = "ascii_reader: y and dy have different length" |
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309 | raise RuntimeError, msg |
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310 | if has_error_dx == True and not len(x) == len(dx): |
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311 | msg = "ascii_reader: y and dy have different length" |
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312 | raise RuntimeError, msg |
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313 | # If the data length is zero, consider this as |
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314 | # though we were not able to read the file. |
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315 | if len(x) == 0: |
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316 | raise RuntimeError, "ascii_reader: could not load file" |
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317 | |
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318 | #Let's re-order the data to make cal. |
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319 | # curve look better some cases |
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320 | ind = numpy.lexsort((ty, tx)) |
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321 | for i in ind: |
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322 | x[i] = tx[ind[i]] |
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323 | y[i] = ty[ind[i]] |
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324 | if has_error_dy == True: |
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325 | dy[i] = tdy[ind[i]] |
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326 | if has_error_dx == True: |
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327 | dx[i] = tdx[ind[i]] |
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328 | # Zeros in dx, dy |
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329 | if has_error_dx: |
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330 | dx[dx == 0] = _ZERO |
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331 | if has_error_dy: |
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332 | dy[dy == 0] = _ZERO |
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333 | #Data |
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334 | output.x = x[x != 0] |
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335 | output.y = y[x != 0] |
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336 | output.dy = dy[x != 0] if has_error_dy == True\ |
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337 | else numpy.zeros(len(output.y)) |
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338 | output.dx = dx[x != 0] if has_error_dx == True\ |
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339 | else numpy.zeros(len(output.x)) |
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340 | |
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341 | if data_conv_q is not None: |
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342 | output.xaxis("\\rm{Q}", output.x_unit) |
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343 | else: |
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344 | output.xaxis("\\rm{Q}", 'A^{-1}') |
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345 | if data_conv_i is not None: |
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346 | output.yaxis("\\rm{Intensity}", output.y_unit) |
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347 | else: |
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348 | output.yaxis("\\rm{Intensity}", "cm^{-1}") |
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349 | |
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350 | # Store loading process information |
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351 | output.meta_data['loader'] = self.type_name |
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352 | if len(output.x) < 1: |
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353 | raise RuntimeError, "%s is empty" % path |
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354 | return output |
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355 | |
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356 | else: |
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357 | raise RuntimeError, "%s is not a file" % path |
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358 | return None |
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