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mlsystem.cc

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#include <stdio.h>
#include "magic/mlsystem.h"



//                                                                           //
//                |      ----                                                //
//                |     |          ___               ___                     //
//                |     | --- |/\  ___| |/|/| |/|/|  ___| |/\                //
//                |     |   \ |   (   | | | | | | | (   | |                  //
//                |____ |___/ |    \__| | | | | | |  \__| |                  //
//                                                                           //

void LGrammar::addRule (const String& left, const String& right) {
    rules.add (new LRule (left, right));
}

void LGrammar::applyTo (String& str, int times) const {
    for (int t=0; t<times; t++) {
        String nextstr = "";
        // Scan through the string
        for (uint pos=0; pos < str.length(); pos++) {
            // Try to match each rule to this position
            bool matched = false;
            for (int rule=0; rule<rules.size(); rule++) {
                const String& left = rules[rule].left;
                if (str.mid (pos, left.length()) == left) {
                    // Matched. Now replace.
                    nextstr += rules[rule].right;
                    matched = true;
                    break;
                }
            }
            
            // If no match, just copy the character
            if (!matched)
                nextstr += str.mid (pos, 1);
        }
        str = nextstr;
    }
}

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