source: tester/comparison.py @ 1203

import globals  # our source
import re
import sys
import os, os.path


class Comparison:
        def __init__(self, l1, l2):
                self.list2_file = '' # (last if there are many) file name with goal results (if they are stored in a file)
                self.list1 = self.prepare_fill_in_files(l1)
                self.list2 = self.prepare_fill_in_files(l2)
                self.p1 = 0  # updated position within list1
                self.p2 = 0  # updated position within list2
                self.equal = True  # the final comparison result
                self.result = ""  # details of comparing individual lines

                while not self.finished():
                        if not self.compare_element():
                                self.equal = False

        @staticmethod
        def load_platform_specific(file_name):
                name = file_name + "-" + globals.PLATFORM + ".goal"

                try:
                        fin = open(os.path.join(globals.THISDIR, name), encoding='utf8')  # first we look for the file with the specialized name (platform-dependent)...
                except IOError as e1:
                        try:
                                fin = open(os.path.join(globals.THISDIR, file_name + ".goal"), encoding='utf8')  # ...if there is no such file, we try to find the default file
                        except IOError as e2:
                                print()
                                print(e1)
                                print(e2)
                                print('Proceeding as if the missing file were empty.')
                                return []
                list_of_lines = []
                for line in fin:
                        line = globals.stripEOL(line)
                        list_of_lines.append(line)
                return list_of_lines

        def prepare_fill_in_files(self, list_of_lines):  # when finds a line with SPEC_USEPLATFORMDEPENDENTFILE, replaces it with the contents of the appropriate file
                new_list = []
                for l in list_of_lines:
                        if l.startswith(globals.SPEC_INSERTPLATFORMDEPENDENTFILE):
                                file_name = l[len(globals.SPEC_INSERTPLATFORMDEPENDENTFILE):]
                                new_list += self.load_platform_specific(file_name)
                                self.list2_file = file_name
                        else:
                                new_list.append(l)
                return new_list

        def finished(self):
                return self.p1 >= len(self.list1) and self.p2 >= len(self.list2)

        @staticmethod
        def compare_strings(s1, s2):
                if s1 == s2:
                        return True
                if not globals.WIN_SLASH_SENSITIVE and os.path.sep == '\\':  # give a chance for approximate comparison - does not distinguish /\ but only on the windows platform
                        return s1.replace('\\', '/') == s2  # and matches only the local output, assuming that the goal uses linux-standard /
                else:
                        return False

        def compare_element(self):
                e1 = "(missing)" if self.p1 >= len(self.list1) else self.list1[self.p1]
                e2 = "(missing)" if self.p2 >= len(self.list2) else self.list2[self.p2]
                e2disp = e2
                if e2.startswith(globals.SPEC_SKIPTO):
                        e2 = e2[len(globals.SPEC_SKIPTO):]
                        waiting = True
                        if self.p1 >= len(self.list1):  # exception: skipto becomes a standard comparison when the input stream ends (because then we know we will not read anything more than we have now)
                                waiting = False
                else:
                        waiting = False
                if e2.startswith(globals.SPEC_REGEXP):
                        equal = re.match(e2[len(globals.SPEC_REGEXP):], e1)
                else:
                        equal = self.compare_strings(e1, e2)  # ignoring the discrimination of /\ will work only when regexp's are not used
                self.result += repr(e1) + " "
                if equal:
                        self.p2 += 1
                else:
                        if waiting:  # handling skipto:
                                if self.p1 >= len(self.list1):
                                        self.p2 += 1
                                else:
                                        equal = True
                        else:
                                self.p2 += 1
                if equal:
                        self.result += globals.ANSI_SETGREEN + "ok" + globals.ANSI_RESET + "\n"  # if both are identical, we display only the left one
                else:
                        self.result += globals.ANSI_SETRED + "<FAIL>" + globals.ANSI_RESET + " "
                        self.result += repr(e2disp) + "\n"
                self.p1 += 1
                return equal