Project for SE5002L: Compiler Principles, written w/ Python 3 & ANTLR 4.
Make sure you have Java & ANTLR installed. Target is generated using visitor mode.
java org.antlr.v4.Tool -Dlanguage=Python3 -no-listener -visitor Graph.g4
Matplotlib, Numpy & ANTLR runtime is required:
pip install matplotlib numpy antlr4-python3-runtime
Run the project via python Runner.py.
Two modes are offered by the interpreter: file input & interactive.
File input: Use -f <filename> to select a input file. For sample graph: python Runner.py -f sample_graph.txt
Interactive: Use -i to enter interactive mode.
A sample graphing program can be found at sample_graph.txt.
Note that statements should end with ";". However statements without ";" are tolerated in interactive mode.
| Statement | Description |
|---|---|
FOR T FROM <A> TO <B> STEP <C> DRAW(<X>,<Y>) |
Draw points in a loop. X & Y are expressions containing the iterated vairable T. |
SCALE IS (<X>, <Y>) |
Set the scale of X & Y axis. |
ORIGIN IS (<X>, <Y>) |
Set the origin of X & Y axis. |
ROT IS (<RAD>) |
Rotate the coordinates by its origin for RAD radian. |
COLOR IS <COLOR> or COLOR IS (<R>,<G>,<B>) |
Set the color of points to draw next. COLOR can be RED, BLACK, YELLOW, GREEN, BLUE. R ,G & B are valid between 0~255. |
--<Comment> or //<Comment> or /* <Multi-line comment> */ |
Comments! |
Expressions are where calculations are made.
- Numbers can be represented as
1,1.1or1.1E3. - Arithmetic operations
+,-,*,/,**(power) are supported. - Mathmatic functions sin, cos, tan, ln, exp, sqrt are supported.
- Constants
eandpi. - Use
()to priortize operations.