1 | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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2 | * Copyright (C) 2001 Gerwin Klein <[email protected]> *
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3 | * Copyright (C) 2001 Bernhard Rumpe <[email protected]> *
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4 | * All rights reserved. *
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5 | * *
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6 | * This program is free software; you can redistribute it and/or modify *
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7 | * it under the terms of the GNU General Public License. See the file *
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8 | * COPYRIGHT for more information. *
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9 | * *
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10 | * This program is distributed in the hope that it will be useful, *
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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13 | * GNU General Public License for more details. *
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14 | * *
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15 | * You should have received a copy of the GNU General Public License along *
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16 | * with this program; if not, write to the Free Software Foundation, Inc., *
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17 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *
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18 | * *
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19 | * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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20 |
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21 |
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22 | /**
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23 | * AST node for an identifier
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24 | */
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25 | class Tident extends Texp implements AST {
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26 | String name;
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27 |
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28 | public Tident(String s) {
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29 | name = s;
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30 | }
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31 |
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32 | public String toString() {
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33 | return name;
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34 | }
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35 |
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36 | public void checkcontext(SymTab st) { // CoCo (DefVar)
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37 | SymtabEntry ste = st.lookup(name);
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38 |
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39 | if (ste==null)
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40 | Main.error("variable not defined: "+name);
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41 | else if (ste.kind() != SymtabEntry.VAR)
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42 | Main.error("function used as variable: "+name);
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43 | }
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44 |
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45 | int index; // number of ident in environment
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46 | boolean is_input; // is it an input variable?
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47 |
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48 | public void prepInterp(SymTab st) { // set index for environment
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49 | STEvar ste = (STEvar)st.lookup(name);
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50 | index = ste.getIndex();
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51 | is_input = ste.isInput();
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52 | }
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53 |
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54 | public int interpret(int[] in, int[] par) {
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55 | if (is_input)
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56 | return(in[index]);
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57 | else
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58 | return(par[index]);
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59 | }
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60 | }
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61 |
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62 |
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