Syntax Analyser

Feature Set

• A basic syntax and semantic analyser of C-based programs supporting following features:
  • Data types - int, char
  • Assignments to the variables can be done at the time of declaration.
  • IO get x;(taking x as input from stdin)
    put x;(printing x at stdout)
  • Conditional statement syntax: id = expression ? expression:expression;
  • Relational Operators supported: {>, <, ~}
  • Arithmetic Operators supported: {+, -, *}
  • Only main() function is supported. The function may definition may contain arguments and return statement.
  • White-spaces and new lines within statements are ignored.
  • Statements end with ;
• Steps involved in the construction of the Compiler -
  • Construction of CFG for the language.
  • Building Lexical Analyser to scan the stream of characters from a program written in above language and generate a stream of tokens to pass to the parser.
  • Building a Bottom-up parser for this language using SLR(1) parsing technique.

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File Description

CFG

• mod.txt: Map from symbols of the language to letters of CFG
• LetterCFG.txt: CFG grammar productions
• augCFG.txt: Human readable CFG grammar production

INPUT

• input.cpp: Input file to analyse
• keywords.txt: File for keywords

OUTPUT

• tokens.txt: Output from Lexical Analyser
• DFA_for_Lexical.txt: DFA states
• StatesFile.txt: Item set created
• GoToTransitions.txt: Goto (I,a) for all item set
• Parsing Table.csv: SLR parsing table

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Steps to run

• Put the file to be analysed in input.cpp
• Open a terminal and go to the project's directory
• Run command g++ -o compile driver.cpp -w
• Run command ./compile input_file

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