Cc618 / Up-Lang

Up is a programming language with Python like syntax, static typing and transpiled in C.

Up-Lang

Up is a programming language with Python like syntax, static typing and is transpiled in C.

Up syntax

More details in this file

# This is an inline comment

# Import up modules (import the file ./mymodule.up)
use mymodule

# Wrapper to import libc c headers
use libc

# Create a variable with type int
int a = 42

# Create a variable with automatically deduced type (num here)
$b = 38.2

# Some operations
a++
a += 8

# Condition
a > 0 ?
    # Function call
    exit()

# Else if
or a == b ?
    fun()

# Else
or
    fun()

# Loops
for i to 618
    log(i)
for i=3 to 8
    ...
for i=10 to 1
    ..

# yes means true
while yes
    ...

# Functions
int myFunc(int a, int b)
    ...
    ret 42

# C compatibility
# cdef declares an extern C function
cdef num cosf(num)

%{
    // This code is in the global scope
    int myNb = 128;
%}

# Objects
# To declare objects, see syntax.md
$o = MyObject(618)
o.add(48)

Depedencies

Up targets linux platforms, some programs are required to compile Up :

• make
• gcc
• g++
• flex
• bison

Mechanism

There are two processes : Parsing and compiling. Parsing serves to understand program semantics, it creates components. Compiling is used to gather all those components in one string, the program.

Parsing

We use bison and flex to parse, flex is used to tokenize the text and bison to analyze semantics. The class Scanner handle this process.

Compiling

To compile multiple components are used :

• Variable : Has a type and an identifier

Usage

To compile a file :

# Display to stdout the C code
up <entry.up>
# Transpile to C
up <entry.up> <out.c>
# Compile to Bin
up <entry.up> <out>

To run the test file located at test/main.up :

make test

Example

Here is a small example :

# To have functions from stdio.h, stdlib.h and math.h
use libc

# $ means auto type
$a = 42

# num stands for floating point
num b = -618.32

# Booleans are set with yes or no
bool c = yes
$yesOrNo = no
$x = 'I am a string'

# Declare variable without initialization
$nil c

# Create function
nil func()
    a = b
    b = 3.14

# Operations
b = 8
a += --b

# Functions
printf('Result : %f\n', cosf(3.14))

Result :

// Code generated by the Up compiler

#include "stdio.h"
#include "stdlib.h"
#include "math.h"

void func() {
    a = b;
    b = 3.14f;
}

int main() {
    int a = 42;
    float b = -618.32f;
    uint8 c = true;
    uint8 yesOrNo = false;
    const char* x = "I am a string";
    void c;
    b = 8;
    a += --b;
    printf("Result : %f\n", cosf(3.14f));
}