tanner / cs-3240-project

An LL1 Parser for a CS 3240 project at Georgia Tech.

LL1 Parser

Created by Tanner Smith and Ryan Ashcraft.

Instructions

To run the project, simply compile LL1Parser.java and run java LL1Parser [path to grammar file] [path to file to input file].

For example:

cd src/
javac LL1Parser.java
java LL1Parser ../tests/tiny_precedence/grammar.txt ../tests/tiny_precedence/test.txt

An optional -v argument is an optional runtime argument that enable verbose mode. Verbose mode prints the revised grammar, the first and follow sets, the parsing table, and the parsing operations to the the console.

Output

After successfully parsing a grammar, the program will create two files in the active directory:

• A tokenized version of the input file will be written in the current working directory with the extension of .tok.
• A text file containing the parsing table named parsing_table.txt.

Note: For some grammars, the parsing table can be rather large. In these cases, it will be difficult to read the parsing table unless word wrap is disabled. For viewing the parsing table in the terminal without word wrap, run the command less -S parsing_table.txt.

Examples

Example grammar files and programs to parse can be found in the tests/ directory.