GRL

Program translating GRL (Graphs Representation Language) into dot, with lex and yacc. GRL is an artificial language made by me. Program was made as a Text Proccessing student's project.

Contents:

• grl.l - lex tokenizer for GRL language
• grl.y - yacc parser for GRL language
• grlEx - example graph wrriten in GRL
• Makefile - Makefile that builds lexer & parser, and then translates grlEx into dot and prints graph in ps format. To run it you need to have Lex, Yacc and dot installed on your machine.

GRL Documentation

• Each line ends with a ';'.
• Comments starts with '#':

# An example comment

• To start a new graph:

BEGIN_GRAPH "GraphName";

• To start a new driected graph:

BEGIN_DIGRAPH "GraphName";

Graph name is optional.

• To draw a new node:

NODE 1 "Node label";

Node label is optional.

• To draw a new edge:

EDGE 1--3 "Edge label";  #Non directed edge
EDGE 1->3;               #Directed edge

Edge label is optional.

• To add an egde with a custom style:

EDGE 1->3 STYLE="dotted";

• To end a graph:

END_GRAPH;

• To set a node shape or style:

NODE 5 "Extra 2" STYLE="filled" SHAPE="star";

All flags are optional.

• To set a default node shape:

DEFAULT_SHAPE "circle";

• To set a default node style:

DEFAULT_STYLE "dotted";

Graph build from grlEx code: