TWS is a Translator Writing System.
To install the TWS:
1. Edit pgen/Makefile. All but one of lines 12-16 should be
commented. For Linux machines, uncomment line 12. For CISE Sun
machines, uncomment line 15.
2. While in 'tws' directory, simply type 'make'.
About Tiny:
Tiny is a language implemented over TWS. Tiny runs on a stack based TWS virutal machine.
The Tiny folder contains four main files:
CodeGenerator.c: This is the source file for the code generator.
Constrainer.c: This is the source file for the contextual constrainer.
lex.tiny, parse.tiny in the parser folder inside the tiny folder. These are lexical and parsing specifications for Tiny. parse.tiny describes Tiny's syntax.
tc: This is the Tiny Compiler/Interpreter. It's nothing more than a shell script, that invokes the scanner/parser,
then the constrainer, then the code generator, and finally the interpreter. As these as executed, their effect is as
follows:
1) The parser produces a file called _TREE, in your current directory (the 'tiny' directory).
2) The constrainer reads in the _TREE file, traverses the tree, adds constraining information to it, and writes
it back out.
3) The code generator reads in the tree, traverses it to generate code, and produces a file called _CODE in your
current directory. It also updates the new (slightly) modified tree.
4) The interpreter reads in the _CODE file, and simulates the execution of the program in it.
Features of Tiny:
* Types: integer
char
bool
enum
const
* for statement
* if case
* repeat statement
* case statement
* loop statement with exit statement
* swap statement A :=: B
* succ, pred and ord for integers and characters and enumerated types
* read statement
* output statement
* Functions and Procedures
* commenting using curly braces '{' '}'
sample program:
program pr3c01:
{ This is a comment
the output should be:
1 10
2 9
3 8
4 7
5 6
6 5
7 4
8 3
9 2
10 1
}
const pi=3;
e=2;
ten=10;
var i,x,y,z: integer;
begin
for i := 1 to 10 do
if (i=pi) then
output(pi,11-pi)
else if (i=e) then
output(e,11-e)
else if (i=ten) then
output(ten,11-ten)
else
output(i,11-i);
end pr3c01.
More sample programs in : tests/test-progs/