| 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 re |
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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 | |
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| 19 | logger = logging.getLogger(__name__) |
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| 20 | |
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| 21 | if sys.version_info[0] < 3: |
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| 22 | def decode(s): |
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| 23 | return s |
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| 24 | else: |
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| 25 | def decode(s): |
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| 26 | return s.decode() if isinstance(s, bytes) else s |
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| 27 | |
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| 28 | class FileReader(object): |
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| 29 | # String to describe the type of data this reader can load |
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| 30 | type_name = "ASCII" |
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| 31 | # Wildcards to display |
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| 32 | type = ["Text files (*.txt|*.TXT)"] |
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| 33 | # List of allowed extensions |
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| 34 | ext = ['.txt'] |
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| 35 | # Bypass extension check and try to load anyway |
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| 36 | allow_all = False |
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| 37 | # Able to import the unit converter |
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| 38 | has_converter = True |
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| 39 | # Default value of zero |
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| 40 | _ZERO = 1e-16 |
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| 41 | |
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| 42 | def __init__(self): |
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| 43 | # List of Data1D and Data2D objects to be sent back to data_loader |
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| 44 | self.output = [] |
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| 45 | # Current plottable_(1D/2D) object being loaded in |
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| 46 | self.current_dataset = None |
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| 47 | # Current DataInfo object being loaded in |
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| 48 | self.current_datainfo = None |
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| 49 | # Open file handle |
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| 50 | self.f_open = None |
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| 51 | |
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| 52 | def read(self, filepath): |
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| 53 | """ |
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| 54 | Basic file reader |
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| 55 | |
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| 56 | :param filepath: The full or relative path to a file to be loaded |
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| 57 | """ |
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| 58 | self.filepath = filepath |
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| 59 | if os.path.isfile(filepath): |
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| 60 | basename, extension = os.path.splitext(os.path.basename(filepath)) |
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| 61 | self.extension = extension.lower() |
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| 62 | # If the file type is not allowed, return nothing |
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| 63 | if self.extension in self.ext or self.allow_all: |
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| 64 | # Try to load the file, but raise an error if unable to. |
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| 65 | try: |
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| 66 | self.f_open = open(filepath, 'rb') |
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| 67 | self.get_file_contents() |
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| 68 | |
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| 69 | except DataReaderException as e: |
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| 70 | self.handle_error_message(e.message) |
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| 71 | except OSError as e: |
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| 72 | # If the file cannot be opened |
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| 73 | msg = "Unable to open file: {}\n".format(filepath) |
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| 74 | msg += e.message |
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| 75 | self.handle_error_message(msg) |
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| 76 | finally: |
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| 77 | # Close the file handle if it is open |
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| 78 | if not self.f_open.closed: |
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| 79 | self.f_open.close() |
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| 80 | if len(self.output) > 0: |
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| 81 | # Sort the data that's been loaded |
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| 82 | self.sort_one_d_data() |
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| 83 | self.sort_two_d_data() |
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| 84 | else: |
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| 85 | msg = "Unable to find file at: {}\n".format(filepath) |
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| 86 | msg += "Please check your file path and try again." |
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| 87 | self.handle_error_message(msg) |
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| 88 | |
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| 89 | # Return a list of parsed entries that data_loader can manage |
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| 90 | final_data = self.output |
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| 91 | self.reset_state() |
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| 92 | return final_data |
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| 93 | |
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| 94 | def reset_state(self): |
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| 95 | """ |
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| 96 | Resets the class state to a base case when loading a new data file so previous |
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| 97 | data files do not appear a second time |
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| 98 | """ |
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| 99 | self.current_datainfo = None |
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| 100 | self.current_dataset = None |
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| 101 | self.output = [] |
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| 102 | |
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| 103 | def nextline(self): |
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| 104 | """ |
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| 105 | Returns the next line in the file as a string. |
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| 106 | """ |
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| 107 | #return self.f_open.readline() |
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| 108 | return decode(self.f_open.readline()) |
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| 109 | |
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| 110 | def nextlines(self): |
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| 111 | """ |
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| 112 | Returns the next line in the file as a string. |
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| 113 | """ |
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| 114 | for line in self.f_open: |
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| 115 | #yield line |
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| 116 | yield decode(line) |
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| 117 | |
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| 118 | def readall(self): |
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| 119 | """ |
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| 120 | Returns the entire file as a string. |
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| 121 | """ |
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| 122 | #return self.f_open.read() |
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| 123 | return decode(self.f_open.read()) |
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| 124 | |
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| 125 | def handle_error_message(self, msg): |
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| 126 | """ |
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| 127 | Generic error handler to add an error to the current datainfo to |
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| 128 | propagate the error up the error chain. |
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| 129 | :param msg: Error message |
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| 130 | """ |
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| 131 | if len(self.output) > 0: |
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| 132 | self.output[-1].errors.append(msg) |
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| 133 | elif isinstance(self.current_datainfo, DataInfo): |
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| 134 | self.current_datainfo.errors.append(msg) |
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| 135 | else: |
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| 136 | logger.warning(msg) |
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| 137 | |
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| 138 | def send_to_output(self): |
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| 139 | """ |
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| 140 | Helper that automatically combines the info and set and then appends it |
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| 141 | to output |
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| 142 | """ |
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| 143 | data_obj = combine_data_info_with_plottable(self.current_dataset, |
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| 144 | self.current_datainfo) |
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| 145 | self.output.append(data_obj) |
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| 146 | |
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| 147 | def sort_one_d_data(self): |
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| 148 | """ |
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| 149 | Sort 1D data along the X axis for consistency |
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| 150 | """ |
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| 151 | for data in self.output: |
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| 152 | if isinstance(data, Data1D): |
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| 153 | # Normalize the units for |
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| 154 | data.x_unit = self.format_unit(data.x_unit) |
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| 155 | data.y_unit = self.format_unit(data.y_unit) |
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| 156 | # Sort data by increasing x and remove 1st point |
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| 157 | ind = np.lexsort((data.y, data.x)) |
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| 158 | data.x = np.asarray([data.x[i] for i in ind]).astype(np.float64) |
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| 159 | data.y = np.asarray([data.y[i] for i in ind]).astype(np.float64) |
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| 160 | if data.dx is not None: |
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| 161 | if len(data.dx) == 0: |
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| 162 | data.dx = None |
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| 163 | continue |
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| 164 | data.dx = np.asarray([data.dx[i] for i in ind]).astype(np.float64) |
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| 165 | if data.dxl is not None: |
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| 166 | data.dxl = np.asarray([data.dxl[i] for i in ind]).astype(np.float64) |
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| 167 | if data.dxw is not None: |
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| 168 | data.dxw = np.asarray([data.dxw[i] for i in ind]).astype(np.float64) |
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| 169 | if data.dy is not None: |
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| 170 | if len(data.dy) == 0: |
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| 171 | data.dy = None |
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| 172 | continue |
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| 173 | data.dy = np.asarray([data.dy[i] for i in ind]).astype(np.float64) |
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| 174 | if data.lam is not None: |
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| 175 | data.lam = np.asarray([data.lam[i] for i in ind]).astype(np.float64) |
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| 176 | if data.dlam is not None: |
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| 177 | data.dlam = np.asarray([data.dlam[i] for i in ind]).astype(np.float64) |
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| 178 | if len(data.x) > 0: |
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| 179 | data.xmin = np.min(data.x) |
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| 180 | data.xmax = np.max(data.x) |
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| 181 | data.ymin = np.min(data.y) |
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| 182 | data.ymax = np.max(data.y) |
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| 183 | |
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| 184 | def sort_two_d_data(self): |
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| 185 | for dataset in self.output: |
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| 186 | if isinstance(dataset, Data2D): |
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| 187 | # Normalize the units for |
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| 188 | dataset.x_unit = self.format_unit(dataset.Q_unit) |
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| 189 | dataset.y_unit = self.format_unit(dataset.I_unit) |
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| 190 | dataset.data = dataset.data.astype(np.float64) |
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| 191 | dataset.qx_data = dataset.qx_data.astype(np.float64) |
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| 192 | dataset.xmin = np.min(dataset.qx_data) |
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| 193 | dataset.xmax = np.max(dataset.qx_data) |
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| 194 | dataset.qy_data = dataset.qy_data.astype(np.float64) |
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| 195 | dataset.ymin = np.min(dataset.qy_data) |
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| 196 | dataset.ymax = np.max(dataset.qy_data) |
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| 197 | dataset.q_data = np.sqrt(dataset.qx_data * dataset.qx_data |
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| 198 | + dataset.qy_data * dataset.qy_data) |
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| 199 | if dataset.err_data is not None: |
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| 200 | dataset.err_data = dataset.err_data.astype(np.float64) |
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| 201 | if dataset.dqx_data is not None: |
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| 202 | dataset.dqx_data = dataset.dqx_data.astype(np.float64) |
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| 203 | if dataset.dqy_data is not None: |
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| 204 | dataset.dqy_data = dataset.dqy_data.astype(np.float64) |
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| 205 | if dataset.mask is not None: |
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| 206 | dataset.mask = dataset.mask.astype(dtype=bool) |
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| 207 | |
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| 208 | if len(dataset.data.shape) == 2: |
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| 209 | n_rows, n_cols = dataset.data.shape |
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| 210 | dataset.y_bins = dataset.qy_data[0::int(n_cols)] |
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| 211 | dataset.x_bins = dataset.qx_data[:int(n_cols)] |
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| 212 | dataset.data = dataset.data.flatten() |
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| 213 | if len(dataset.data) > 0: |
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| 214 | dataset.xmin = np.min(dataset.qx_data) |
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| 215 | dataset.xmax = np.max(dataset.qx_data) |
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| 216 | dataset.ymin = np.min(dataset.qy_data) |
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| 217 | dataset.ymax = np.max(dataset.qx_data) |
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| 218 | |
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| 219 | def format_unit(self, unit=None): |
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| 220 | """ |
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| 221 | Format units a common way |
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| 222 | :param unit: |
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| 223 | :return: |
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| 224 | """ |
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| 225 | if unit: |
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| 226 | split = unit.split("/") |
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| 227 | if len(split) == 1: |
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| 228 | return unit |
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| 229 | elif split[0] == '1': |
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| 230 | return "{0}^".format(split[1]) + "{-1}" |
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| 231 | else: |
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| 232 | return "{0}*{1}^".format(split[0], split[1]) + "{-1}" |
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| 233 | |
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| 234 | def set_all_to_none(self): |
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| 235 | """ |
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| 236 | Set all mutable values to None for error handling purposes |
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| 237 | """ |
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| 238 | self.current_dataset = None |
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| 239 | self.current_datainfo = None |
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| 240 | self.output = [] |
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| 241 | |
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| 242 | def data_cleanup(self): |
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| 243 | """ |
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| 244 | Clean up the data sets and refresh everything |
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| 245 | :return: None |
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| 246 | """ |
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| 247 | self.remove_empty_q_values() |
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| 248 | self.send_to_output() # Combine datasets with DataInfo |
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| 249 | self.current_datainfo = DataInfo() # Reset DataInfo |
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| 250 | |
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| 251 | def remove_empty_q_values(self): |
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| 252 | """ |
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| 253 | Remove any point where Q == 0 |
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| 254 | """ |
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| 255 | if isinstance(self.current_dataset, plottable_1D): |
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| 256 | # Booleans for resolutions |
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| 257 | has_error_dx = self.current_dataset.dx is not None |
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| 258 | has_error_dxl = self.current_dataset.dxl is not None |
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| 259 | has_error_dxw = self.current_dataset.dxw is not None |
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| 260 | has_error_dy = self.current_dataset.dy is not None |
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| 261 | # Create arrays of zeros for non-existent resolutions |
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| 262 | if has_error_dxw and not has_error_dxl: |
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| 263 | array_size = self.current_dataset.dxw.size - 1 |
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| 264 | self.current_dataset.dxl = np.append(self.current_dataset.dxl, |
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| 265 | np.zeros([array_size])) |
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| 266 | has_error_dxl = True |
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| 267 | elif has_error_dxl and not has_error_dxw: |
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| 268 | array_size = self.current_dataset.dxl.size - 1 |
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| 269 | self.current_dataset.dxw = np.append(self.current_dataset.dxw, |
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| 270 | np.zeros([array_size])) |
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| 271 | has_error_dxw = True |
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| 272 | elif not has_error_dxl and not has_error_dxw and not has_error_dx: |
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| 273 | array_size = self.current_dataset.x.size - 1 |
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| 274 | self.current_dataset.dx = np.append(self.current_dataset.dx, |
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| 275 | np.zeros([array_size])) |
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| 276 | has_error_dx = True |
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| 277 | if not has_error_dy: |
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| 278 | array_size = self.current_dataset.y.size - 1 |
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| 279 | self.current_dataset.dy = np.append(self.current_dataset.dy, |
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| 280 | np.zeros([array_size])) |
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| 281 | has_error_dy = True |
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| 282 | |
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| 283 | # Remove points where q = 0 |
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| 284 | x = self.current_dataset.x |
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| 285 | self.current_dataset.x = self.current_dataset.x[x != 0] |
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| 286 | self.current_dataset.y = self.current_dataset.y[x != 0] |
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| 287 | if has_error_dy: |
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| 288 | self.current_dataset.dy = self.current_dataset.dy[x != 0] |
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| 289 | if has_error_dx: |
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| 290 | self.current_dataset.dx = self.current_dataset.dx[x != 0] |
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| 291 | if has_error_dxl: |
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| 292 | self.current_dataset.dxl = self.current_dataset.dxl[x != 0] |
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| 293 | if has_error_dxw: |
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| 294 | self.current_dataset.dxw = self.current_dataset.dxw[x != 0] |
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| 295 | elif isinstance(self.current_dataset, plottable_2D): |
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| 296 | has_error_dqx = self.current_dataset.dqx_data is not None |
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| 297 | has_error_dqy = self.current_dataset.dqy_data is not None |
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| 298 | has_error_dy = self.current_dataset.err_data is not None |
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| 299 | has_mask = self.current_dataset.mask is not None |
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| 300 | x = self.current_dataset.qx_data |
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| 301 | self.current_dataset.data = self.current_dataset.data[x != 0] |
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| 302 | self.current_dataset.qx_data = self.current_dataset.qx_data[x != 0] |
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| 303 | self.current_dataset.qy_data = self.current_dataset.qy_data[x != 0] |
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| 304 | self.current_dataset.q_data = np.sqrt( |
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| 305 | np.square(self.current_dataset.qx_data) + np.square( |
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| 306 | self.current_dataset.qy_data)) |
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| 307 | if has_error_dy: |
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| 308 | self.current_dataset.err_data = self.current_dataset.err_data[x != 0] |
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| 309 | if has_error_dqx: |
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| 310 | self.current_dataset.dqx_data = self.current_dataset.dqx_data[x != 0] |
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| 311 | if has_error_dqy: |
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| 312 | self.current_dataset.dqy_data = self.current_dataset.dqy_data[x != 0] |
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| 313 | if has_mask: |
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| 314 | self.current_dataset.mask = self.current_dataset.mask[x != 0] |
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| 315 | |
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| 316 | def reset_data_list(self, no_lines=0): |
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| 317 | """ |
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| 318 | Reset the plottable_1D object |
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| 319 | """ |
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| 320 | # Initialize data sets with arrays the maximum possible size |
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| 321 | x = np.zeros(no_lines) |
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| 322 | y = np.zeros(no_lines) |
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| 323 | dx = np.zeros(no_lines) |
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| 324 | dy = np.zeros(no_lines) |
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| 325 | self.current_dataset = plottable_1D(x, y, dx, dy) |
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| 326 | |
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| 327 | @staticmethod |
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| 328 | def splitline(line): |
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| 329 | """ |
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| 330 | Splits a line into pieces based on common delimiters |
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| 331 | :param line: A single line of text |
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| 332 | :return: list of values |
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| 333 | """ |
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| 334 | # Initial try for CSV (split on ,) |
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| 335 | toks = line.split(',') |
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| 336 | # Now try SCSV (split on ;) |
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| 337 | if len(toks) < 2: |
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| 338 | toks = line.split(';') |
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| 339 | # Now go for whitespace |
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| 340 | if len(toks) < 2: |
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| 341 | toks = line.split() |
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| 342 | return toks |
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| 343 | |
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| 344 | @abstractmethod |
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| 345 | def get_file_contents(self): |
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| 346 | """ |
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| 347 | Reader specific class to access the contents of the file |
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| 348 | All reader classes that inherit from FileReader must implement |
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| 349 | """ |
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| 350 | pass |
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