import os import sys import re import shlex from collections.abc import Iterable import numpy as np # ------------------------------------------------------------------ class ASCIItable(): """Read and write to ASCII tables.""" tmpext = '_tmp' # filename extension for in-place access # ------------------------------------------------------------------ def __init__(self, name = None, outname = None, buffered = False, # flush writes labeled = True, # assume table has labels readonly = False, # no reading from file ): """Read and write to ASCII tables.""" self.__IO__ = {'output': [], 'labeled': labeled, # header contains labels 'tags': [], # labels according to file info 'dataStart': 0, } self.__IO__['inPlace'] = not outname and name and not readonly if self.__IO__['inPlace']: outname = name + self.tmpext # transparently create tmp file try: self.__IO__['in'] = (open( name,'r') if os.access( name, os.R_OK) else None) if name else sys.stdin except TypeError: self.__IO__['in'] = name try: self.__IO__['out'] = (open(outname,'w') if (not os.path.isfile(outname) or os.access( outname, os.W_OK) ) and (not self.__IO__['inPlace'] or not os.path.isfile(name) or os.access( name, os.W_OK) ) else None) if outname else sys.stdout except TypeError: self.__IO__['out'] = outname self.info = [] self.tags = [] self.data = [] self.line = '' if self.__IO__['in'] is None \ or self.__IO__['out'] is None: raise IOError # complain if any required file access not possible # ------------------------------------------------------------------ def _removeCRLF(self, string): """Delete any carriage return and line feed from string.""" try: return string.replace('\n','').replace('\r','') except AttributeError: return str(string) # ------------------------------------------------------------------ def _quote(self, what): """Quote empty or white space-containing output.""" return '{quote}{content}{quote}'.format( quote = ('"' if str(what)=='' or re.search(r"\s",str(what)) else ''), content = what) # ------------------------------------------------------------------ def close(self, dismiss = False): if self.__IO__['in'] != sys.stdin: self.__IO__['in'].close() self.output_flush() if self.__IO__['out'] != sys.stdout: self.__IO__['out'].close() if dismiss and os.path.isfile(self.__IO__['out'].name): os.remove(self.__IO__['out'].name) elif self.__IO__['inPlace']: os.rename(self.__IO__['out'].name, self.__IO__['out'].name[:-len(self.tmpext)]) # ------------------------------------------------------------------ def output_write(self, what): """Aggregate a single row (string) or list of (possibly containing further lists of) rows into output.""" if isinstance(what, str): self.__IO__['output'] += [what] else: try: for item in what: self.output_write(item) except TypeError: self.__IO__['output'] += [str(what)] return self.output_flush() # ------------------------------------------------------------------ def output_flush(self, clear = True): try: self.__IO__['output'] == [] or self.__IO__['out'].write('\n'.join(self.__IO__['output']) + '\n') except IOError: return False if clear: self.__IO__['output'] = [] return True # ------------------------------------------------------------------ def head_read(self): """ Get column labels. by either reading the first row or, if keyword "head[*]" is present, the last line of the header """ try: self.__IO__['in'].seek(0) except IOError: pass firstline = self.__IO__['in'].readline().strip() m = re.search(r'(\d+)\s+head', firstline.lower()) # search for "head" keyword if m: # proper ASCIItable format if self.__IO__['labeled']: # table features labels self.info = [self.__IO__['in'].readline().strip() for i in range(1,int(m.group(1)))] self.tags = shlex.split(self.__IO__['in'].readline()) # store tags found in last line else: self.info = [self.__IO__['in'].readline().strip() for i in range(0,int(m.group(1)))] # all header is info ... else: # other table format self.__IO__['in'].seek(0) while self.data_read(advance = False, respectLabels = False): if self.line[0] in ['#','!','%','/','|','*','$']: # "typical" comment indicators self.info_append(self.line) # store comment as info self.data_read() # wind forward one line else: break # last line of comments if self.__IO__['labeled']: # table features labels self.tags = self.data # get tags from last line in "header"... self.data_read() # ...and remove from buffer if self.__IO__['labeled']: # table features tags self.__IO__['tags'] = list(self.tags) # backup tags (make COPY, not link) try: self.__IO__['dataStart'] = self.__IO__['in'].tell() # current file position is at start of data except IOError: pass # ------------------------------------------------------------------ def head_write(self, header = True): """Write current header information (info + labels).""" head = ['{}\theader'.format(len(self.info)+self.__IO__['labeled'])] if header else [] head.append(self.info) if self.__IO__['labeled']: head.append('\t'.join(map(self._quote,self.tags))) if len(self.tags) == 0: raise ValueError('no labels present.') return self.output_write(head) # ------------------------------------------------------------------ def head_getGeom(self): """Interpret geom header.""" identifiers = { 'grid': ['a','b','c'], 'size': ['x','y','z'], 'origin': ['x','y','z'], } mappings = { 'grid': lambda x: int(x), 'size': lambda x: float(x), 'origin': lambda x: float(x), 'homogenization': lambda x: int(x), 'microstructures': lambda x: int(x), } info = { 'grid': np.zeros(3,'i'), 'size': np.zeros(3,'d'), 'origin': np.zeros(3,'d'), 'homogenization': 0, 'microstructures': 0, } extra_header = [] for header in self.info: headitems = list(map(str.lower,header.split())) if len(headitems) == 0: continue # skip blank lines if headitems[0] in list(mappings.keys()): if headitems[0] in list(identifiers.keys()): for i in range(len(identifiers[headitems[0]])): info[headitems[0]][i] = \ mappings[headitems[0]](headitems[headitems.index(identifiers[headitems[0]][i])+1]) else: info[headitems[0]] = mappings[headitems[0]](headitems[1]) else: extra_header.append(header) return info,extra_header # ------------------------------------------------------------------ def labels_append(self, what, reset = False): """Add item or list to existing set of labels (and switch on labeling).""" if isinstance(what, str): self.tags += [self._removeCRLF(what)] else: try: for item in what: self.labels_append(item) except TypeError: self.tags += [self._removeCRLF(str(what))] self.__IO__['labeled'] = True # switch on processing (in particular writing) of tags if reset: self.__IO__['tags'] = list(self.tags) # subsequent data_read uses current tags as data size # ------------------------------------------------------------------ def labels_clear(self): """Delete existing labels and switch to no labeling.""" self.tags = [] self.__IO__['labeled'] = False # ------------------------------------------------------------------ def labels(self, tags = None, raw = False): """ Tell abstract labels. "x" for "1_x","2_x",... unless raw output is requested. operates on object tags or given list. """ if tags is None: tags = self.tags if isinstance(tags, Iterable) and not raw: # check whether list of tags is requested id = 0 dim = 1 labelList = [] while id < len(tags): if not tags[id].startswith('1_'): labelList.append(tags[id]) else: label = tags[id][2:] # get label while id < len(tags) and tags[id] == '{}_{}'.format(dim,label): # check successors id += 1 # next label... dim += 1 # ...should be one higher dimension labelList.append(label) # reached end --> store id -= 1 # rewind one to consider again id += 1 dim = 1 else: labelList = self.tags return labelList # ------------------------------------------------------------------ def label_index(self, labels): """ Tell index of column label(s). return numpy array if asked for list of labels. transparently deals with label positions implicitly given as numbers or their headings given as strings. """ if isinstance(labels, Iterable) and not isinstance(labels, str): # check whether list of labels is requested idx = [] for label in labels: if label is not None: try: idx.append(int(label)-1) # column given as integer number? except ValueError: label = label[1:-1] if label[0] == label[-1] and label[0] in ('"',"'") else label # remove outermost quotations try: idx.append(self.tags.index(label)) # locate string in label list except ValueError: try: idx.append(self.tags.index('1_'+label)) # locate '1_'+string in label list except ValueError: idx.append(-1) # not found... else: try: idx = int(labels)-1 # offset for python array indexing except ValueError: try: labels = labels[1:-1] if labels[0] == labels[-1] and labels[0] in ('"',"'") else labels # remove outermost quotations idx = self.tags.index(labels) except ValueError: try: idx = self.tags.index('1_'+labels) # locate '1_'+string in label list except ValueError: idx = None if labels is None else -1 return np.array(idx) if isinstance(idx,Iterable) else idx # ------------------------------------------------------------------ def label_dimension(self, labels): """ Tell dimension (length) of column label(s). return numpy array if asked for list of labels. transparently deals with label positions implicitly given as numbers or their headings given as strings. """ listOfLabels = isinstance(labels, Iterable) and not isinstance(labels, str) # check whether list of labels is requested if not listOfLabels: labels = [labels] dim = [] for label in labels: if label is not None: myDim = -1 try: # column given as number? idx = int(label)-1 myDim = 1 # if found treat as single column of dimension 1 except ValueError: # column has string label label = label[1:-1] if label[0] == label[-1] and label[0] in ('"',"'") else label # remove outermost quotations if label in self.tags: # can be directly found? myDim = 1 # scalar by definition elif '1_'+label in self.tags: # look for first entry of possible multidim object idx = self.tags.index('1_'+label) # get starting column myDim = 1 # (at least) one-dimensional while idx+myDim < len(self.tags) and self.tags[idx+myDim].startswith("%i_"%(myDim+1)): myDim += 1 # keep adding while going through object dim.append(myDim) return np.array(dim) if listOfLabels else dim[0] # ------------------------------------------------------------------ def label_indexrange(self, labels): """ Tell index range for given label(s). return numpy array if asked for list of labels. transparently deals with label positions implicitly given as numbers or their headings given as strings. """ start = self.label_index(labels) dim = self.label_dimension(labels) return np.hstack([range(s,s+d) for s,d in zip(start,dim)]).astype(int) \ if isinstance(labels, Iterable) and not isinstance(labels, str) \ else range(start,start+dim) # ------------------------------------------------------------------ def info_append(self, what): """Add item or list to existing set of infos.""" if isinstance(what, str): self.info += [self._removeCRLF(what)] else: try: for item in what: self.info_append(item) except TypeError: self.info += [self._removeCRLF(str(what))] # ------------------------------------------------------------------ def info_clear(self): """Delete any info block.""" self.info = [] # ------------------------------------------------------------------ def data_rewind(self): self.__IO__['in'].seek(self.__IO__['dataStart']) # position file to start of data section self.tags = list(self.__IO__['tags']) # restore label info found in header (as COPY, not link) self.__IO__['labeled'] = len(self.tags) > 0 # ------------------------------------------------------------------ def data_read(self, advance = True, respectLabels = True): """Read next line and parse it into data array.""" self.line = self.__IO__['in'].readline().strip() self.line = self.line.rstrip('\n') if self.__IO__['labeled'] and respectLabels: # if table has labels items = shlex.split(self.line)[:len(self.__IO__['tags'])] # use up to label count (from original file info) self.data = items if len(items) == len(self.__IO__['tags']) else [] # take entries if label count matches else: self.data = shlex.split(self.line) # otherwise take all return self.data != [] # ------------------------------------------------------------------ def data_readArray(self, labels = []): """Read whole data of all (given) labels as numpy array.""" try: self.data_rewind() # try to wind back to start of data except IOError: pass # assume/hope we are at data start already... if labels is None or labels == []: use = None # use all columns (and keep labels intact) labels_missing = [] else: if isinstance(labels, str) or not isinstance(labels, Iterable): # check whether labels are a list or single item labels = [labels] indices = self.label_index(labels) # check requested labels ... dimensions = self.label_dimension(labels) # ... and remember their dimension present = np.where(indices >= 0)[0] # positions in request list of labels that are present ... missing = np.where(indices < 0)[0] # ... and missing in table labels_missing = np.array(labels)[missing] # labels of missing data columns = [] for i,(c,d) in enumerate(zip(indices[present],dimensions[present])): # for all valid labels ... # ... transparently add all components unless column referenced by number or with explicit dimension columns += list(range(c,c + (d if str(c) != str(labels[present[i]]) else 1))) use = np.array(columns) if len(columns) > 0 else None self.tags = list(np.array(self.__IO__['tags'])[use]) # update labels with valid subset self.data = np.loadtxt(self.__IO__['in'],usecols=use,ndmin=2) return labels_missing # ------------------------------------------------------------------ def data_write(self, delimiter = '\t'): """Write current data array and report alive output back.""" if len(self.data) == 0: return True if isinstance(self.data[0],list): return self.output_write([delimiter.join(map(self._quote,items)) for items in self.data]) else: return self.output_write( delimiter.join(map(self._quote,self.data))) # ------------------------------------------------------------------ def data_writeArray(self, fmt = None, delimiter = '\t'): """Write whole numpy array data.""" for row in self.data: try: output = [fmt % value for value in row] if fmt else list(map(repr,row)) except Exception: output = [fmt % row] if fmt else [repr(row)] try: self.__IO__['out'].write(delimiter.join(output) + '\n') except Exception: pass # ------------------------------------------------------------------ def data_append(self, what): if isinstance(what, str): self.data += [what] else: try: for item in what: self.data_append(item) except TypeError: self.data += [str(what)]