87 lines
2.1 KiB
Python
87 lines
2.1 KiB
Python
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# Assignment-A2 (Pass 1 and pass 2 macro processor)
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try:
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source= open('source.txt', 'r')
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dum = source.readline()
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print("File is read successfully.")
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source.seek(0)
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except FileNotFoundError:
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print('\n\n\nsource.txt file not found.\nOpen Macroprocessor Folder in VSC[not the main folder]\n\n\n')
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except IOError:
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print('The source file has an IO error')
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MDT =[]
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MNT =[]
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def macroman(line):
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name = line.split()[1] #A concise way to get the 2nd word-> name of macro. index =1. first split and then get 2nd word
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entry = []
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entry.append(line.strip()) #append the macro definition line
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while True:
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line=source.readline().upper()
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if not line:
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print('No MEND found for: ', name)
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return
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if 'MACRO' in line:
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macroman(line)
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elif 'MEND' in line:
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global MDT, MNT
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entry.append(line.strip()) #MEND line appended too
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MNT.append([len(MNT)+1, name, len(MDT)+1]) # Eg. 1 Fibo 50
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MDT = MDT + entry
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return
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else:
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entry.append(line.strip())
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def pass1():
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global MDT, MNT
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while True:
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line = source.readline().upper()
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if not line:break
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if 'MACRO' in line:
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macroman(line)
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print('\nMNT:')
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for a in MNT:
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print(a)
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print('\n\nMDT:')
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i=0
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for a in MDT:
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i=i+1
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print (i, ' ',a)
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pass1()
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#pass 2 starts here:
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def inserter(sline, name):
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global MDT, MNT
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sline = ''
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for a in MNT:
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if a[1] == name:
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add = a[2]
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break
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while True:
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if 'MEND' in MDT[add]:
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break
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sline += MDT[add] + '\n'
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add+=1
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return sline
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def pass2():
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source.seek(0)
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output = open('output.txt', 'w')
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output.close()
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output = open('output.txt', 'a+')
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while True:
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sline= source.readline().upper()
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if not sline:break
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for a in MNT:
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if a[1] in sline and 'MACRO' not in sline:
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sline=inserter(sline, a[1])
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d = sline.strip()
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if d not in MDT:
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output.write(sline)
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print('done.')
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pass2()
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