projects / OpenSPARC-T2-SAM / blame
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| 54 | ||
| 55 | <H2><A NAME="SECTION0020130000000000000000"></A><A NAME="Querying_ASTs"></A> | |
| 56 | <BR> | |
| 57 | 18.1.3 Queries on AST Objects | |
| 58 | </H2> | |
| 59 | ||
| 60 | <P> | |
| 61 | Two functions are provided which allow an application to determine if | |
| 62 | an AST was created as an expression or a suite. Neither of these | |
| 63 | functions can be used to determine if an AST was created from source | |
| 64 | code via <tt class="function">expr()</tt> or <tt class="function">suite()</tt> or from a parse tree | |
| 65 | via <tt class="function">sequence2ast()</tt>. | |
| 66 | ||
| 67 | <P> | |
| 68 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 69 | <td><nobr><b><tt id='l2h-4946' xml:id='l2h-4946' class="function">isexpr</tt></b>(</nobr></td> | |
| 70 | <td><var>ast</var>)</td></tr></table></dt> | |
| 71 | <dd> | |
| 72 | When <var>ast</var> represents an <code>'eval'</code> form, this function | |
| 73 | returns true, otherwise it returns false. This is useful, since code | |
| 74 | objects normally cannot be queried for this information using existing | |
| 75 | built-in functions. Note that the code objects created by | |
| 76 | <tt class="function">compileast()</tt> cannot be queried like this either, and are | |
| 77 | identical to those created by the built-in | |
| 78 | <tt class="function">compile()</tt><a id='l2h-4947' xml:id='l2h-4947'></a> function. | |
| 79 | </dl> | |
| 80 | ||
| 81 | <P> | |
| 82 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 83 | <td><nobr><b><tt id='l2h-4948' xml:id='l2h-4948' class="function">issuite</tt></b>(</nobr></td> | |
| 84 | <td><var>ast</var>)</td></tr></table></dt> | |
| 85 | <dd> | |
| 86 | This function mirrors <tt class="function">isexpr()</tt> in that it reports whether an | |
| 87 | AST object represents an <code>'exec'</code> form, commonly known as a | |
| 88 | ``suite.'' It is not safe to assume that this function is equivalent | |
| 89 | to "<tt class="samp">not isexpr(<var>ast</var>)</tt>", as additional syntactic fragments may | |
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