hawk/hawk

Hawk

• Language
• Basic Modules
• Embedding Guide

Language

Hawk implements most of the AWK programming language elements with extensions.

Entry Point

You may change the entry point of your script by setting a function name with @pragma entry.

@pragma entry main

function main ()
{
	print "hello, world";
}

Value

• unitialized value
• integer
• floating-point number
• string
• byte string
• array

Module

Incompatibility with AWK

Parameter passing

In AWK, the caller can pass an uninitialized variable as a function parameter and get a changed value if the callled function sets it to an array.

function q(a) {a[1]=20; a[2]=30;}
BEGIN { q(x); for (i in x) print i, x[i]; }

In Hawk, you can prefix the pramater name with & to indicate call-by-reference for the same effect.

function q(&a) {a[1]=20; a[2]=30;}
BEGIN { q(x); for (i in x) print i, x[i]; }

Alternatively, you may form an array before passing it to a function.

function q(a) {a[1]=20; a[2]=30;}
BEGIN { x[3]=99; q(x); for (i in x) print i, x[i]; }'

Basic Modules

sys

ffi

mysql

Embedding Guide