# Compiler Construction PA1 Worklog

## Team:
<br>Apoorva Ranade(ar6496)
<br>Sanjar Ahmadov(sa5640)
<br>Yinqi Sun(ys3540)
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## Indentation:
 - A stack is maintained by the lexer to keep track of indentations. A count is accumulated for the number of whitespace characters before the first token. If the count changes from the previous line count, a stack operation is performed. If count increases, another value is added to the stack. If count decreases, the topmost value is popped from the stack. 
   - The file: src/main/jflex/chocopy/pa1/ChocoPy.jflex, lines from 100 to 182, contain the code for the stack. 
   - Line 270 of the same file deals with additional dedents in case the input ends in an indented state.

## Challenges:
 - Shift-reduce errors while parsing the grammar. One approach to fix is to change the grammar. We chose to fix this issue by adding a precedence as in the case of expr by adding right precedence for if and else.
 - Handling errors was another challenge. This required debugging and small changes to program flow.
 - Understanding the giving code was a small challenge and took some time before we could start coding.

## Improvements: 
 - Added more tests to rigorously check program flow and indentation.
 - Support for multi-line strings.