Nick Dubovik

final_task/mylib.py

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+
+def s(n: object) -> object:
+    return n*n

final_task/pycalc.py

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+import math
+import operator
+import importlib.util
+import argparse
+import sys
+
+OPERATORS = {'+': (2, operator.add), '-': (2, operator.sub),
+             '*': (3, operator.mul), '/': (3, operator.truediv),
+             '^': (4, operator.pow), '//': (3, operator.floordiv),
+             '%': (3, operator.mod), '<': (1, operator.lt),
+             '<=': (1, operator.le), '>': (1, operator.gt),
+             '!=': (1, operator.ne), '>=': (1, operator.ge),
+             '==': (1, operator.eq), '?': (4, operator.neg)}
+
+STLO = {'True': True, 'False': False}
+FUNCTION = {'round': round, 'abs': abs, 'pow': pow}
+STNUMBER = '1234567890.'
+STBUK = 'qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM_'
+STOP = '<+->/!=*^%'
+
+
+version = "1.2.1"
+
+
+def createparser():
+    parser = argparse.ArgumentParser(
+        prog='''pycalc''',
+        description='''A program to calculate complex mathematical expressions''',
+        epilog='''(c) Nick Dubovik 2018. The author of the program does not take any responsibility for anything.''',
+        add_help=False)
+    parent_group = parser.add_argument_group(title='Optional arguments')
+    parent_group.add_argument('--help', '-h', action='help', help='Help')
+    parser.add_argument('--mod', '-m', default='math', help='Additional modules to use',
+                        metavar='MODULE')
+    parser.add_argument('string', type=str, default='', help='Expression string to evaluate',
+                        metavar='EXPRESSION')
+    parent_group.add_argument('--version', action='version', help='Show the version number',
+                              version='%(prog)s {}'.format(version))
+    return parser
+
+
+def check_module(module_name):
+    # Checks if the module can be imported without actually importing it
+    module_spec = importlib.util.find_spec(module_name)
+    return module_spec
+
+
+def import_module_from_spec(module_spec):
+    module = importlib.util.module_from_spec(module_spec)
+    module_spec.loader.exec_module(module)
+    return module
+
+
+def result(module, sst):
+
+    # Reading and token allocation------------------------------------------------------
+
+    def parse(sst):
+
+        if len(sst) == 0:
+            raise Exception('Empty expression.')
+        pr = 0
+        lev = 0
+        last_op = ''
+        for j, s in enumerate(sst):
+            if s == ' ':
+                if sst[j - 1] in '/*%^><=' and sst[j + 1] in '/*%^><=':
+                    raise Exception('space between operators')
+                if sst[j - 1] in STNUMBER and sst[j + 1] in STNUMBER:
+                    raise Exception('space')
+        st = sst.replace(" ", "")
+        if st[0] in '+-':
+            st = "0" + st
+        n = len(st)
+        i = 0
+        while i < n:
+            if st[i] in STNUMBER:
+                last_op = ''
+                number = ''
+                # if st[i] == '.':
+                # number += '0'
+                while st[i] in STNUMBER:
+                    number += st[i]
+                    i = i + 1
+                    if i >= n:
+                        break
+                if i >= n:
+                    yield (float(number))
+                    break
+                elif i < n and (st[i] in STOP or st[i] == ')' or st[i] == ','):
+                    yield (float(number))
+                elif i < n and st[i] in STBUK or st[i] == '(':
+                    yield float(number)
+                    yield '*'
+
+            if st[i] in STOP:
+                if st[0] in '*/%^><=!':
+                    raise Exception('No arguments befor operator')
+                op = ''
+                while st[i] in STOP:
+                    op += st[i]
+                    i = i + 1
+                    if op in '-+^%*':
+                        break
+                    elif i < n and op in '-+^%*/><=' and st[i] in '+-':
+                        break
+                    if i >= n:
+                        break
+                if last_op != '':
+                    if op == '-':
+                        op = "?"
+                        yield "?"
+                        last_op = op
+                    elif op == '+':
+                        last_op = op
+                else:
+                    if i >= n:
+                        raise Exception('The operator has not got arguments.')
+                    yield op
+                    last_op = op
+
+            if st[i] in STBUK:
+                last_op = ''
+                func = ''
+                while st[i] in STBUK or st[i] in STNUMBER:
+                    func += st[i]
+                    i = i + 1
+                    if (i < n and (hasattr(math, func) or hasattr(module, func)) and (
+                            st[i] == '(' or st[i] in STBUK)) or i >= n or func in STLO:
+                        break
+                if i >= n:
+                    if hasattr(math, func) or hasattr(module, func):
+                        cc = '$' + func + '@'
+                        yield cc
+                    elif func in STLO:
+                        logic = ''
+                        logic += '$' + func + '#'
+                        yield logic
+                    else:
+                        raise Exception(func + ' is not in the library.')
+                else:
+                    if st[i] == '(' and (hasattr(math, func) or hasattr(module, func) or func in FUNCTION):
+                        f = ''
+                        # k-number of '()',z-number of ','
+                        k = 0
+                        z = 0
+                        j = i
+                        while k != 0 or j < n:
+                            if st[j] == ')':
+                                k = k - 1
+                            elif st[j] == '(':
+                                k = k + 1
+                            elif st[j] == ',' and k == 1:
+                                z = z + 1
+                            j = j + 1
+                            if j >= n or k == 0:
+                                break
+                        zz = str(z)
+                        f += '$' + zz + func + '&'  # function
+                        yield f
+
+                    elif hasattr(math, func) or hasattr(module, func):
+                        const = ''
+                        const += '$' + func + '@'  # const
+                        if st[i] in STBUK or st[i] in STNUMBER:
+                            yield const
+                            yield '*'
+                        else:
+                            yield const
+
+                    elif func in STLO:
+                        logic = ''
+                        logic += '$' + func + '#'  # const
+                        if st[i] in STBUK or st[i] in STNUMBER:
+                            yield logic
+                            yield '*'
+                        else:
+                            yield logic
+                    else:
+                        raise Exception(func + ' is not in the library.')
+                if i >= n:
+                    break
+
+            if st[i] in '()':
+                if st[i] == '(':
+                    lev = lev + 1
+                    last_op = '('
+                elif st[i] == ')':
+                    pr = pr + 1
+                    last_op = ''
+                i = i + 1
+                if i < n and st[i - 1] == ')' and (st[i] in STNUMBER or st[i] in STBUK or st[i] == '('):
+                    yield st[i - 1]
+                    yield '*'
+                else:
+                    yield st[i - 1]
+                if i >= n:
+                    break
+
+            if st[i] == ',':
+                last_op = ','
+                i = i + 1
+                yield st[i - 1]
+                if i >= n:
+                    break
+        if pr != lev:
+            raise Exception('Unequal number of brackets')
+
+    # conversion to Polish notation------------------------------------------------------------------------------
+
+    def shunting_yard(parsed_formula):
+        stack = []
+        for token in parsed_formula:
+
+            if type(token) is str and token[0] == '$' and token[-1] == '&':
+                stack.append(token)  # function
+
+            elif type(token) is str and token[0] == '$' and token[-1] == '@':
+                mcon = token.replace('$', '').replace('@', '')
+                zz = getattr(math, mcon)
+                yield float(zz)  # const
+
+            elif type(token) is str and token[0] == '$' and token[-1] == '#':
+                mlo = token.replace('$', '').replace('#', '')
+                yield STLO[mlo]  # logic
+
+            elif token in OPERATORS:
+                if token == '^' or token == '?':
+                    while stack and stack[-1] != "(" and OPERATORS[token][0] < OPERATORS[stack[-1]][0]:
+                        yield stack.pop()
+                else:
+                    while stack and stack[-1] != "(" and OPERATORS[token][0] <= OPERATORS[stack[-1]][0]:
+                        yield stack.pop()
+                stack.append(token)
+
+            elif token == ',':
+                while stack:
+                    if stack[-1] == '(':
+                        break
+                    yield stack.pop()
+
+            elif token == ")":
+                while stack:
+                    x = stack.pop()
+                    if x == "(":
+                        break
+                    yield x
+                if stack:
+                    yy = stack[-1]
+                    if type(yy) is str and yy[0] == '$' and yy[-1] == '&':
+                        yield stack.pop()
+
+            elif token == "(":
+                stack.append(token)
+
+            elif type(token) is float:
+                yield token
+
+        while stack:
+            yield stack.pop()
+
+    # calculating Polish notation------------------------------------------------------------------------------
+
+    def calculation(polish):
+        stack = []
+        for token in polish:
+            if token in OPERATORS:
+                if token == '?':
+                    x = stack.pop()
+                    stack.append(OPERATORS[token][1](x))
+                else:
+                    y, x = stack.pop(), stack.pop()
+                    stack.append(OPERATORS[token][1](x, y))
+
+            elif type(token) is str and token[0] == '$' and token[-1] == '&':
+                mfun = token.replace('$', '').replace('&', '')
+                kk = ''
+                for s in mfun:
+                    if s in STNUMBER:
+                        kk += s
+                    else:
+                        break
+                k = int(kk)
+                # k-number of ',' k+1-number of arguments for function
+                mmfun = mfun.lstrip(kk)
+                x = []  # list of arguments for function
+                for l in range(k + 1):
+                    y = stack.pop()
+                    x.append(y)
+                if hasattr(module, mmfun):
+                    z = getattr(module, mmfun)
+                    stack.append(z(*x[::-1]))
+                elif hasattr(math, mmfun):
+                    z = getattr(math, mmfun)
+                    stack.append(z(*x[::-1]))
+                elif mmfun in FUNCTION:
+                    g = FUNCTION[mmfun](*x[::-1])
+                    stack.append(g)
+                else:
+                    raise Exception('The function is not in the library.')
+            else:
+                stack.append(token)
+
+        return stack[0]
+
+    return calculation(shunting_yard(parse(sst)))
+
+
+# main------------------------------------------------------------------------------------
+
+
+def main():
+    parser = createparser()
+    namespace = parser.parse_args(sys.argv[1:])
+    # print(namespace)
+    try:
+        lib = namespace.mod
+        # lib is connected library
+        st = namespace.string
+        module_spec = check_module(lib)
+        if module_spec:
+            module = import_module_from_spec(module_spec)
+        print(result(module, st))
+        # Output result
+    except Exception as error:
+        print('ERROR: ' + repr(error))
+
+    # final

final_task/setup.py

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+from setuptools import setup, find_packages
+
+setup(name="pycalc",
+      version="1.2.1",
+      author="Nick Dubovik",
+      author_email="[email protected]",
+      description='A program to calculate complex mathematical expressions with support for custom libraries.',
+      scripts={"pycalc.py"},
+      packages=find_packages(),
+      entry_points={'console_scripts': ['pycalc = pycalc:main']}, )