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annotate ast/Expr.d @ 201:4f94b5adbc8a

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Added ast/Expr.d to contain all expressions.
author Anders Johnsen <skabet@gmail.com>
date Mon, 11 Aug 2008 18:41:45 +0200
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children 227d6a8fb574
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201
4f94b5adbc8a Added ast/Expr.d to contain all expressions.
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1 module ast.Expr;
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2
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3 /**
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4 The base class for all Expressions.
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5 */
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6 class Expr
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7 {
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8 /// Returns true if the Expr can be compile-time evaluated.
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9 bool isConstantExpr() { return false; }
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10
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11 NumberLiteral asNumberLiteral() { return null; }
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12 bool isNumberLiteral() { return false; }
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13
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14 StringLiteral asStringLiteral() { return null; }
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15 bool isStringLiteral() { return false; }
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16
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17 ArrayLiteral asArrayLiteral() { return null; }
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18 bool isArrayLiteral() { return false; }
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19 }
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20
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21 /**
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22 NumberLiteral
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23 */
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24 class NumberLiteral : Expr
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25 {
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26 override bool isConstantExpr() { return true; }
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27
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28 override NumberLiteral asNumberLiteral() { return this; }
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29 override bool isNumberLiteral() { return true; }
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30 }
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31
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32 /**
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33 StringLiteral
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34 */
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35 class StringLiteral : Expr
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36 {
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37 override bool isConstantExpr() { return true; }
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38
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39 override StringLiteral asStringLiteral() { return this; }
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40 override bool isStringLiteral() { return true; }
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41 }
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42
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43
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44 /**
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45 StringLiteral
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46 */
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47 class ArrayLiteral : Expr
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48 {
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49 override bool isConstantExpr()
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50 {
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51 foreach (arg; arguments)
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52 if (!arg.isConstantExpr())
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53 return false;
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54 return true;
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55 }
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56
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57 override ArrayLiteral asArrayLiteral() { return this; }
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58 override bool isArrayLiteral() { return true; }
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59
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60 private:
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61 Expr[] arguments;
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62 }
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63
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64
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65
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66 /**
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67 Identifier
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68 */
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69 class Identifier : Expr
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70 {
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71
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72 }