From b65b2a794f1a235c9aa0bcfd645656e5c57027a6 Mon Sep 17 00:00:00 2001
From: Kshitij <kshitijk@tuta.io>
Date: Mon, 14 Oct 2024 11:18:56 +0530
Subject: [PATCH] Merged Code-A1 from testing branch to main branch and added
 link in README file.

---
 Codes/Group A/Assignment-A1/Code-A1.py | 109 +++++++++++++++++++++++++
 Codes/Group A/Assignment-A1/source.txt |   4 +
 README.md                              |   1 +
 3 files changed, 114 insertions(+)
 create mode 100755 Codes/Group A/Assignment-A1/Code-A1.py
 create mode 100755 Codes/Group A/Assignment-A1/source.txt

diff --git a/Codes/Group A/Assignment-A1/Code-A1.py b/Codes/Group A/Assignment-A1/Code-A1.py
new file mode 100755
index 0000000..2681c95
--- /dev/null
+++ b/Codes/Group A/Assignment-A1/Code-A1.py	
@@ -0,0 +1,109 @@
+# Assignment-A1
+
+try:
+    source = open('source.txt','r')
+    data = source.read()
+    print('File read successfully\n\n')
+    source.seek(0)
+except FileNotFoundError: #A little bit of exception handling
+    print('\n\n\nFile Not found. Create a source.txt first.\n\n\n ')
+except IOError:
+    print('There was an IO error')
+LT_index = 0 #index of LT table
+ST_index = 0 #index of ST table
+add = 0 # address in source code
+MOT = {'STOP': '00','ADD': '01','SUB': '02','MULT': '03','MOVER': '04','MOVEM': '05','COMP': '06','BC': '07','DIV': '08','READ': '09','PRINT': '10','START': '01','END': '02','ORIGIN': '03','LTORG': '05','DS': '01','DC': '02','AREG,': '01','BREG,': '02','EQ':'01'}
+ST = []
+code=[]
+LT=[]
+MC = []
+# LT, ST are lists of lists. code= intermediate code table
+
+
+def classy(text):
+    '''This function will return the class of the word to be inputted in the Intermediate table'''
+    text = text.upper()
+    if text in ['STOP','ADD','SUB', 'MULT','MOVER','MOVEM','COMP','BC','DIV','READ', 'PRINT']:
+        return 'IS'
+    elif text in ['START','END','ORIGIN','LTORG']:
+        return 'AD'
+    elif text in ['DS','DC']:
+        return 'DL'
+    elif text in ['AREG,','BREG,']: return 'RG'
+    elif text in ['EQ']: return 'CC'
+    else: return 'None'
+
+def handle_start():
+    '''This function gives you the starting address of the code'''
+    line= source.readline()
+    words=line.split()
+    if words[0].upper()=='START':
+        return int(words[1])
+    else: 
+        print("No Start Statement! Abort!\n")
+        return 0
+
+def pass1():
+    add=handle_start()
+    if not add:
+        print("Ending Pass 1 due to Above error.")
+        return
+    global ST_index, LT_index  # to modify global variables, use global keyword
+    while True:
+        line=source.readline()# handlestart function reads line 1 and we start from the second line.
+        if not line:
+            break
+        words= line.split()
+        for w in words:
+            w=w.upper()
+            if w[0]=='=':
+                entry=[LT_index,w, add]
+                LT.append(entry)
+                LT_index +=1 
+            elif classy(w)== 'None':
+                for term in ST:
+                    if w== term[1]: break # I check if the label is already present in ST.
+                else:
+                    entry=[ST_index,w, add]
+                    ST.append(entry)
+                    ST_index +=1
+        add+=1
+    print('LT:')
+    for a in LT:
+        print(a)
+    print('\n\n\nST:')
+    for a in ST:
+        print(a)
+        
+def intermediate():
+    source.seek(0)
+    while True:
+        entry=[]
+        ind = 0
+        line=source.readline()
+        if not line:
+            break
+        words=line.split()
+        for w in words:
+            w=w.upper()
+            if classy(w)!='None': #it is a directive
+                entry.append((classy(w),MOT[w]))
+            elif w[0]== '=': #it is a literal.
+                for a in LT:
+                    if a[1]==w:
+                        ind = a[0]
+                        break
+                entry.append(('L',ind))
+            else: #it is a symbol
+                for a in ST:
+                    if a[1]==w:
+                        ind = a[0]
+                        break
+                entry.append(('S',ind))
+        code.append(entry)
+    print("\nThe Intermediate code is:")
+    for entry in code:
+        print(entry)
+
+pass1()
+intermediate()
diff --git a/Codes/Group A/Assignment-A1/source.txt b/Codes/Group A/Assignment-A1/source.txt
new file mode 100755
index 0000000..0548fd2
--- /dev/null
+++ b/Codes/Group A/Assignment-A1/source.txt	
@@ -0,0 +1,4 @@
+Start 100
+Label MOVER AREG, =5
+add areg, =999
+sub breg, x
diff --git a/README.md b/README.md
index 93403f2..9226327 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@ This repository serves as a comprehensive resource for the Systems Programming a
 
 ### Codes
 ##### Group A
+1. [Code-A1 - Pass 1](https://git.kska.io/sppu-te-comp-content/SystemsProgrammingAndOperatingSystem/src/branch/main/Codes/Group%20A/Code-A1.py)
 2. [Code-A2 - Pass 1 and Pass 2 of 2-Pass Macroprocessor](https://git.kska.io/sppu-te-comp-content/SystemsProgrammingAndOperatingSystem/src/branch/main/Codes/Group%20A/Code-A2.py)
 
 ##### Group B