Mercurial > projects > ddmd
annotate dmd/CaseRangeStatement.d @ 187:b0d41ff5e0df
Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
| author | Abscissa |
|---|---|
| date | Tue, 07 Jun 2011 23:37:34 -0400 |
| parents | e3afd1303184 |
| children |
| rev | line source |
|---|---|
| 0 | 1 module dmd.CaseRangeStatement; |
| 2 | |
| 114 | 3 import dmd.common; |
| 0 | 4 import dmd.Statement; |
| 64 | 5 import dmd.ArrayTypes; |
| 0 | 6 import dmd.Expression; |
| 64 | 7 import dmd.ExpStatement; |
| 8 import dmd.IntegerExp; | |
| 9 import dmd.CaseStatement; | |
| 10 import dmd.CompoundStatement; | |
| 0 | 11 import dmd.Statement; |
| 12 import dmd.Loc; | |
| 13 import dmd.OutBuffer; | |
| 64 | 14 import dmd.WANT; |
| 15 import dmd.SwitchStatement; | |
| 0 | 16 import dmd.HdrGenState; |
| 17 import dmd.Scope; | |
| 18 | |
|
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b0d41ff5e0df
Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
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19 import dmd.DDMDExtensions; |
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b0d41ff5e0df
Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
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20 |
| 0 | 21 class CaseRangeStatement : Statement |
| 22 { | |
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Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
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23 mixin insertMemberExtension!(typeof(this)); |
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b0d41ff5e0df
Added expandability scheme outlined in http://www.dsource.org/forums/viewtopic.php?t=5659&sid=6f2150ff5b0bffcd47512a6a7608d218
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24 |
| 0 | 25 Expression first; |
| 26 Expression last; | |
| 27 Statement statement; | |
| 28 | |
| 29 this(Loc loc, Expression first, Expression last, Statement s) | |
| 30 { | |
| 178 | 31 register(); |
| 32 | |
| 0 | 33 super(loc); |
| 51 | 34 this.first = first; |
| 35 this.last = last; | |
| 36 this.statement = s; | |
| 0 | 37 } |
| 38 | |
| 72 | 39 override Statement syntaxCopy() |
| 0 | 40 { |
| 41 assert(false); | |
| 42 } | |
| 43 | |
| 72 | 44 override Statement semantic(Scope sc) |
| 0 | 45 { |
| 64 | 46 SwitchStatement sw = sc.sw; |
| 47 | |
| 48 //printf("CaseRangeStatement.semantic() %s\n", toChars()); | |
| 49 if (sw.isFinal) | |
| 50 error("case ranges not allowed in final switch"); | |
| 51 | |
| 52 first = first.semantic(sc); | |
| 53 first = first.implicitCastTo(sc, sw.condition.type); | |
| 54 first = first.optimize(WANTvalue | WANTinterpret); | |
| 55 long fval = first.toInteger(); | |
| 56 | |
| 57 last = last.semantic(sc); | |
| 58 last = last.implicitCastTo(sc, sw.condition.type); | |
| 59 last = last.optimize(WANTvalue | WANTinterpret); | |
| 60 long lval = last.toInteger(); | |
| 61 | |
| 62 if (lval - fval > 256) | |
| 63 { | |
| 64 error("more than 256 cases in case range"); | |
| 65 lval = fval + 256; | |
| 66 } | |
| 67 | |
| 68 /* This works by replacing the CaseRange with an array of Case's. | |
| 69 * | |
| 70 * case a: .. case b: s; | |
| 71 * => | |
| 72 * case a: | |
| 73 * [...] | |
| 74 * case b: | |
| 75 * s; | |
| 76 */ | |
| 77 | |
| 78 Statements statements = new Statements(); | |
| 79 for (long i = fval; i <= lval; i++) | |
| 80 { | |
| 81 Statement s = statement; | |
| 82 if (i != lval) | |
| 83 s = new ExpStatement(loc, null); | |
| 84 Expression e = new IntegerExp(loc, i, first.type); | |
| 85 Statement cs = new CaseStatement(loc, e, s); | |
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c77e9f4f1793
Statements -> Vector
Eldar Insafutdinov <e.insafutdinov@gmail.com>
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86 statements.push(cs); |
| 64 | 87 } |
| 88 Statement s = new CompoundStatement(loc, statements); | |
| 89 s = s.semantic(sc); | |
| 90 return s; | |
| 0 | 91 } |
| 92 | |
| 72 | 93 override void toCBuffer(OutBuffer buf, HdrGenState* hgs) |
| 0 | 94 { |
| 64 | 95 buf.writestring("case "); |
| 96 first.toCBuffer(buf, hgs); | |
| 97 buf.writestring(": .. case "); | |
| 98 last.toCBuffer(buf, hgs); | |
| 99 buf.writenl(); | |
| 100 statement.toCBuffer(buf, hgs); | |
| 0 | 101 } |
| 72 | 102 } |