/xhp/code_rope.cpp

/*
  +----------------------------------------------------------------------+
  | XHP                                                                  |
  +----------------------------------------------------------------------+
  | Copyright (c) 2009 - 2010 Facebook, Inc. (http://www.facebook.com)          |
  +----------------------------------------------------------------------+
  | This source file is subject to version 3.01 of the PHP license,      |
  | that is bundled with this package in the file LICENSE.PHP, and is    |
  | available through the world-wide-web at the following url:           |
  | http://www.php.net/license/3_01.txt                                  |
  | If you did not receive a copy of the PHP license and are unable to   |
  | obtain it through the world-wide-web, please send a note to          |
  | license@php.net so we can mail you a copy immediately.               |
  +----------------------------------------------------------------------+
*/

#include "code_rope.hpp"
using namespace std;

code_rope::code_rope(const _rope_t str, const size_t no /* = 0 */, const size_t lf /* = 0 */) : str(str), lf(lf), no(no) {}

code_rope::code_rope(const code_rope& str, const size_t no /* = 0 */, const size_t lf /* = 0 */) : str(str.str), lf(lf), no(no) {
  if (str.lf || str.no) {
    if (!no && !lf) {
      this->lf = str.lf;
      this->no = str.no;
    } else {
      throw new std::exception();
    }
  } else {
    this->no = no;
    this->lf = lf;
  }
}

const char* code_rope::c_str() const {
  if (0 && this->no > 1) {
    return NULL;
    // lolololololol
    // this code is clowntown -- returns dealloced memory
    _rope_t whitespace(this->no - 1, '\n');
    whitespace += this->str;
    return whitespace.c_str();
  } else {
    return this->str.c_str();
  }
}

void code_rope::prepend(const char* str) {
  this->str = _rope_t(str) + this->str;
}

const char code_rope::back() const {
  return this->str.empty() ? 0 : this->str.back();
}

void code_rope::pop_back() {
  this->str.pop_back();
}

void code_rope::strip_lines() {
  lf = no = 0;
}

size_t code_rope::lineno() const {
  return no;
}

code_rope code_rope::operator+(const code_rope& right) const {
  size_t diff;
  size_t no, lf;
  _rope_t glue;
  if (this->no && right.no) {
    no = this->no;
    if (right.no > this->no + this->lf) {
      diff = right.no - this->no - this->lf;
      lf = this->lf + right.lf + diff;
      glue = _rope_t(diff, '\n');
    } else {
      no = this->no;
      lf = this->lf + right.lf;
    }
  } else if (right.no) {
    no = right.no;
    lf = this->lf + right.lf;
  } else {
    no = this->no;
    lf = this->lf + right.lf;
  }

  code_rope res(this->str, no, lf);
  if (!glue.empty()) res.str += glue;
  res.str += right.str;
  return res;
}

code_rope code_rope::operator+(const char* right) const {
  code_rope res(this->str, this->no, this->lf);
  res.str += right;
  return res;
}

code_rope& code_rope::operator=(const char* str) {
  this->str = str;
  this->no = this->lf = 0;
  return *this;
}

code_rope operator+(const char* left, const code_rope& right) {
  code_rope ret(code_rope::_rope_t(left), right.no, right.lf);
  ret.str += right.str;
  return ret;
}