Common Text Transformation Library: input.cpp

Rudimentary program that demonstrates concept of offset identity, the CTTL equivalent of a logical offset.

// sample program: input.cpp
// demonstrates concept of offset identities

//#define NDEBUG    // define to stop assertions from being compiled 
#include <cassert>
#include <iostream>
#include "cttl/cttl.h"

int main()
{
    using namespace cttl;

    // create input object with identity vector size == 6
    input<> inp( "one two three", 6 );

    // create nodes
    node<> n0( inp, 0 );
    node<> n1( inp, 1 );
    node<> n2( inp, 2 );
    node<> n3( inp, 3 );
    node<> n4( inp, 4 );
    node<> n5( inp, 5 );

    // create edges
    edge<> e01( n0, n1 );
    const_edge<> e23( n2, n3 );
    const_edge<> e45( n4, n5 );

    // pretend that we parsed the input:
    n0.offset( 0 );
    n1.offset( 3 );
    n2.offset( 4 );
    n3.offset( 7 );
    n4.offset( 8 );
    n5.offset( 13 );

    // verify that edges correctly point to the substrings:
    assert( e01.text() == "one" );
    assert( e23.text() == "two" );
    assert( e45.text() == "three" );

    // delete first substring:
    e01.text( "" );

    // verify new substrings:
    assert( e01.text() == "" );
    assert( e23.text() == "two" );
    assert( e45.text() == "three" );

    // verify new absolute offsets:
    assert( n0.offset() == 0 );
    assert( n1.offset() == 0 );
    assert( n2.offset() == 1 );
    assert( n3.offset() == 4 );
    assert( n4.offset() == 5 );
    assert( n5.offset() == 10 );

    // verify modified input text:
    assert( inp.text() == " two three" );
    return 0;
}

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