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1 | office | 1 | /* |
2 | * LrangeCmd.java |
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3 | * |
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4 | * Copyright (c) 1997 Cornell University. |
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5 | * Copyright (c) 1997 Sun Microsystems, Inc. |
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6 | * |
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7 | * See the file "license.terms" for information on usage and |
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8 | * redistribution of this file, and for a DISCLAIMER OF ALL |
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9 | * WARRANTIES. |
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10 | * |
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11 | * Included in SQLite3 port to C# for use in testharness only; 2008 Noah B Hart |
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12 | * |
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13 | * RCS @(#) $Id: LrangeCmd.java,v 1.2 2000/03/17 23:31:30 mo Exp $ |
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14 | * |
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15 | */ |
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16 | using System; |
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17 | namespace tcl.lang |
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18 | { |
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19 | |||
20 | /// <summary> This class implements the built-in "lrange" command in Tcl.</summary> |
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21 | |||
22 | class LrangeCmd : Command |
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23 | { |
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24 | /// <summary> See Tcl user documentation for details.</summary> |
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25 | /// <exception cref=""> TclException If incorrect number of arguments. |
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26 | /// </exception> |
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27 | |||
28 | public TCL.CompletionCode cmdProc( Interp interp, TclObject[] argv ) |
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29 | { |
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30 | if ( argv.Length != 4 ) |
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31 | { |
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32 | throw new TclNumArgsException( interp, 1, argv, "list first last" ); |
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33 | } |
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34 | |||
35 | int size = TclList.getLength( interp, argv[1] ); |
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36 | int first; |
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37 | int last; |
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38 | |||
39 | first = Util.getIntForIndex( interp, argv[2], size - 1 ); |
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40 | last = Util.getIntForIndex( interp, argv[3], size - 1 ); |
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41 | |||
42 | if ( last < 0 ) |
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43 | { |
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44 | interp.resetResult(); |
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45 | return TCL.CompletionCode.RETURN; |
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46 | } |
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47 | if ( first >= size ) |
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48 | { |
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49 | interp.resetResult(); |
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50 | return TCL.CompletionCode.RETURN; |
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51 | } |
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52 | if ( first <= 0 && last >= size ) |
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53 | { |
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54 | interp.setResult( argv[1] ); |
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55 | return TCL.CompletionCode.RETURN; |
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56 | } |
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57 | |||
58 | if ( first < 0 ) |
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59 | { |
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60 | first = 0; |
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61 | } |
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62 | if ( first >= size ) |
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63 | { |
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64 | first = size - 1; |
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65 | } |
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66 | if ( last < 0 ) |
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67 | { |
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68 | last = 0; |
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69 | } |
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70 | if ( last >= size ) |
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71 | { |
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72 | last = size - 1; |
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73 | } |
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74 | if ( first > last ) |
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75 | { |
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76 | interp.resetResult(); |
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77 | return TCL.CompletionCode.RETURN; |
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78 | } |
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79 | |||
80 | TclObject list = TclList.newInstance(); |
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81 | |||
82 | list.preserve(); |
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83 | try |
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84 | { |
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85 | for ( int i = first; i <= last; i++ ) |
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86 | { |
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87 | TclList.append( interp, list, TclList.index( interp, argv[1], i ) ); |
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88 | } |
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89 | interp.setResult( list ); |
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90 | } |
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91 | finally |
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92 | { |
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93 | list.release(); |
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94 | } |
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95 | return TCL.CompletionCode.RETURN; |
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96 | } |
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97 | } |
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98 | } |