engine_read.cpp

Go to the documentation of this file.

/*
Copyright (c) 2014, Sam Schetterer, Nathan Kutz, University of Washington
Authors: Sam Schetterer
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/
#include "engine/engineimp.h"
#include "graph.h"
#include "engine/input.h"
#include "eval_lisp.h"

//passed a string (type name params)
void engineimp::read(std::istream& fstr){
    _read(fstr);
    sort_pp();
}
void engineimp::_read(std::istream& fstr){
    const std::string delim=" ";
    const std::string comment="!";
    const char command = '#';
    std::string token;
    std::string curline;
    int line = 0;
    while(fstr.good()){
        //get current line
        std::getline(fstr, curline);
        line++;
        //remove comments
        size_t cpos = curline.find(comment);
        if(cpos != std::string::npos){
            curline.erase(cpos, std::string::npos);
        }

        //trim leading and trailing whitespace
        trim(curline);
        //skip rest of loop if entire string deleted
        if(curline.empty()){
            continue;
        }
        //if the first character is a !, then a system command is being executed
        if(curline[0] == command){
            curline.erase(0, 1);
            execute_command(curline);
            continue;
        }

        item_wrapper curit = eval_lisp(curline, std::string(), inputs, this);
        values[curit->name()] = item_wrapper(curit); 
    }
    //get the current line from the string
}

void engineimp::sort_pp(){
    std::list<item_wrapper> post_order;
    for(const auto& val : values){
        post_order.push_back(val.second);
    }
    graph gg;
    auto sorted(gg.sort(post_order));
    for(auto val:sorted){
        val->postprocess(inputs[val->name()]);
    }
}

void engineimp::execute_command(std::string inval){
    trim(inval);
    std::string command;
#include <list>
    ltoken(command, inval);
    if(command == "include"){
        //filename is the rest of the line
        std::string fname = curdir;
        fname.append(inval);
        std::ifstream fstr(fname.c_str());
        if(fstr.peek()==std::ifstream::traits_type::eof()){
            fname.append("Empty/non-existant file passed as configuration parameter");
            err(fname, "engineimp::engineimp(std::string)", "engine/engine.cpp", FATAL_ERROR);
        }
        _read(fstr);
    }
    else if(command=="cd"){
        curdir.append(inval);
        trim(curdir, "/");
        curdir.push_back('/');
    }
    else if(command=="setdir"){
        curdir=inval;
    }
}