1881:. Its flavor of Eval supports only expression evaluation, where the expression may include user-defined functions and objects (but not user-defined variable names). Of note, the evaluator is different from VBS, and invocation of certain user-defined functions may work differently in VBA than the identical code in VBScript.
1842:
and use properties of the context object. However, it is still limited to only understanding the most basic types, so if you have a function that returns a
Dictionary or MySpiffyObject, RBScript will be unable to use it. You can also communicate with your RBScript through the Print and Input events.
2207:
Cmdlet serves the same purpose as the eval function in programming languages like JavaScript, PHP and Python. The Cmdlet runs any
Windows PowerShell expression that is provided as a command parameter in the form of a string and outputs the result of the specified expression. Usually, the output of
1865:
are available to developers of compiled
Windows applications (written in languages which do not support Eval) through an ActiveX control called the Microsoft Script Control, whose Eval method can be called by application code. To support calling of user-defined functions, one must first initialize
1841:
which can execute REALbasic code at runtime. RBScript is very sandboxed—only the most core language features are there, and you have to allow it access to things you want it to have. You can optionally assign an object to the context property. This allows for the code in RBScript to call functions
338:
cannot be used to evaluate arbitrary expressions. According to the Flash 8 documentation, its usage is limited to expressions which represent "the name of a variable, property, object, or movie clip to retrieve. This parameter can be either a String or a direct reference to the object instance."
1107:
operator takes an operand — if it is a simple literal it pushes it back on the stack. If one takes a string containing a PostScript expression however, one can convert the string to an executable which then can be executed by the interpreter, for example:
692:
function is something of a hybrid between an expression evaluator and a statement executor. It returns the result of the last expression evaluated (all statements are expressions in Perl programming), and allows the final semicolon to be left off.
1514:" had been written directly instead of mixed in. The argument to mixin doesn't need to be a string literal, but arbitrary expressions resulting in a string value, including function calls, that can be evaluated at compile time.
2004:
function that takes one string argument. The function is both an expression evaluator and a statement executor. In the latter role, it can also be used for error handling. The following examples and text are from the
1866:
the control with the AddCode method, which loads a string (or a string resource) containing a library of user-defined functions defined in the language of one's choice, prior to calling Eval.
1640:
may also be used to evaluate an expression within a specific class definition binding or object instance binding, allowing classes to be extended with new methods specified in strings.
91:, which executes a string (or code in other format) as if it were a statement; in some languages, such as Python, both are present, while in other languages only one of either
1938:, which executes the source code provided as an argument. Tcl represents all source code as strings, with curly braces acting as quotation marks, so that the argument to
2425:
2212:. In case the result is a single-element array, it outputs that single element. Similar to JavaScript, Windows PowerShell allows the final semicolon to be left off.
552:. Evaluation of this symbol must yield the function for addition to make the example work as intended. Thus some dialects of Lisp allow an additional parameter for
2599:
1854:
is a function evaluator that can include calls to user-defined functions. (These functions may have side-effects such as changing the values of global variables.)
1033:
function, which has been augmented to accept strings. In addition, it allows providing the function's environment directly, as environments are now
406:
function in Lisp expects a form to be evaluated as it's argument. The resulting value of the given form will be the returned value of the call to
2691:
843:
is a "language construct" rather than a function, and so cannot be used in some contexts where functions can be, like higher-order functions.
235:
is something of a hybrid between an expression evaluator and a statement executor. It returns the result of the last expression evaluated.
1893:'s compiler classes are part of the standard class library and usually present at run time, these can be used to evaluate a code string.
2280:
2696:
1877:(VBA), the programming language of Microsoft Office, is a virtual machine language where the runtime environment compiles and runs
511:
function. For example, to evaluate the content of a string, the string would first have to be converted into a Lisp form using the
544:
One major point of confusion is the question, in which context the symbols in the form will be evaluated. In the above example,
2730:
2513:
2208:
the Cmdlet is of the same type as the result of executing the expression. However, if the result is an empty array, it outputs
1909:
Because class and method definitions are also implemented by message-sends (to class objects), even code changes are possible:
1137:
which pops the string "Hello World" off the stack and displays it on the screen, to have an executable type, then is executed.
2735:
2619:
1834:
2340:
2300:
1874:
561:
116:
2648:
828:
must be a string of one or more complete statements, not just expressions; however, one can get the "expression" form of
2481:
2312:
1783:
1318:
The most general form for evaluating statements/expressions is using code objects. Those can be created by invoking the
84:
2299:. Microcoding this function was "substantially more" than five times faster compared to a program that interpreted an
1618:
1144:
operator is similar in functionality but instead the interpreter interprets PostScript expressions in a file, itself.
76:
31:
2542:
1034:
944:
63:; in others, it executes multiple lines of code as though they had been included instead of the line including the
2459:
2455:
1997:
782:
365:
2327:
is the actual call of the function with a given set of arguments. The distinction is particularly noticeable in
2443:
2323:
is understood to be the step of converting a quoted string into a callable function and its arguments, whereas
56:
2296:
111:
with data from an untrusted source may introduce security vulnerabilities. For instance, assuming that the
2725:
1431:" the string is statically compiled like ordinary code and must be known at compile time. For example:
2176:). It concatenates all the arguments with spaces, then re-parses and executes the result as a command.
1575:
It is particularly useful when you need to programmatically choose the variable you want to read from.
1243:, which allow the programmer to set up a restricted environment for the evaluation of the expression.
345:
The ActionScript 3 Eval
Library and the D.eval API were development projects to create equivalents to
389:
190:
72:
38:
177:
dictionary to set an authenticated key to be True. To remedy this, all data which will be used with
2328:
1626:
354:
813:
executes code in a string almost exactly as if it had been put in the file instead of the call to
2200:
2099:
returns the value zero if there is no file named "XXX" (instead of halting the user's program).
778:
350:
315:
88:
2675:
2024:
expression. The function is handy for converting numeric strings to numeric internal form. The
2451:
1163:
381:
198:
2559:
2179:
2447:
206:
2432:
2332:
2292:
1510:
The above example will compile to exactly the same assembly language instructions as if "
793:
blocks is interpreted at compile-time instead of run-time, so it is not the meaning of
166:
2719:
2473:
2013:
1412:
71:
is not necessarily a string; it may be structured representation of code, such as an
2517:
2028:
can also be used as a crude form of indirection, as in the following (Note that, in
556:
to specify the context of evaluation (similar to the optional arguments to Python's
181:
must be escaped, or it must be run without access to potentially harmful functions.
2710:
2493:
2291:
to perform "interpretive evaluation of expressions which are written in a modified
2173:
1630:
331:
201:, the same compiler used to compile programs may be embedded in programs using the
60:
17:
48:
605:;; A context for evaluation is called an "environment" in Scheme slang.
376:
function led to the first implementation of the language interpreter. Before the
1858:
executes one or more colon-separated statements, which can change global state.
2484:, which can be interpreted to be the morphisms of Cartesian closed categories.
2169:
1522:
1100:
228:
52:
2706:
2284:
1890:
1878:
1850:
Microsoft's VBScript, which is an interpreted language, has two constructs.
205:
function; separate interpreters are sometimes used, though this results in
1717:# (evaluates to 4, because 'a' in the context of get_binding is 3)
817:. The only exception is that errors are reported as coming from a call to
197:
is almost always implemented with the same interpreter as normal code. In
2477:
2439:
2189:
2009:
1838:
388:
function had been manually compiled it was then used as part of a simple
2546:
2185:
2091:"open(\"X\", \"XXX\", \"r\")"
1415:
is a statically compiled language and therefore does not include an "
1322:
function and by telling it what kind of input it has to compile: an "
1419:" statement in the traditional sense, but does include the related "
30:"Evaluation (computer science)" redirects here. For other uses, see
2701:
2468:
2316:
2336:
767:
685:
515:
function and then the resulting form would have to be passed to
451:; of a form by prefixing it with "'", for example:
418:; A form which calls the + function with 1,2 and 3 as arguments.
311:
380:
function was defined, Lisp functions were manually compiled to
2576:
2277:
1931:
832:
by putting the expression in a return statement, which causes
806:
2560:
1170:
function in its simplest form evaluates a single expression.
2343:. Thus, for example, in Scheme, the distinction is between
27:
Function in a programming language, which evaluates a string
1529:
function lets you evaluate a string expression at runtime.
821:, and return statements become the result of the function.
2530:
2315:, a careful distinction is commonly made between eval and
484:; Now form1 contains a form that can be used by eval, for
2424:, which is the essence of evaluating Lisp, described in
1942:
can have the same formatting as any other source code.
2571:
1625:
function similar to Python or Perl, and also allows a
442:; In Lisp any form is meant to be evaluated, therefore
392:
which formed the basis of the first Lisp interpreter.
626:;; Confuse the initial environment, so that + will be
536:"(format t \"Hello World!!!~%\")"
507:
Lisp is well known to be very flexible and so is the
2707:
Examples of runtime evaluation in several languages
2649:"Conversational Programming System Progress Report"
569:;; Define some simple form as in the above example.
1427:" interprets a string as code at runtime, with a "
1005:-- compile the expression to an anonymous function
399:function have also been implemented as compilers.
1748:"def hello; return 'hello';end"
2702:Jonathan Johnson on exposing classes to RBScript
2697:Python Library Reference: eval built-in function
2692:ANSI and GNU Common Lisp Document: eval function
759:'$ foo += 2; print "$ foo\n";'
602:;; Evaluate the form within the initial context.
448:; We can prevent Lisp from performing evaluation
2018:
2036:(underscore) is the concatenation operator.):
951:compiles Lua code into an anonymous function.
656:;; Notice that the returned value has changed.
372:function in 1958. In fact, definition of the
55:which evaluates a string as though it were an
2450:, with functions taken as morphisms, and the
2420:are the two interdependent components of the
2374:where the form (f x) is to be evaluated, and
1423:" statement. The difference is that, where "
1254:function in Python 3.x) executes statements:
1020:-- execute (and print the result '2')
318:framework. However, modern browsers provide
8:
1754:# add a method 'hello' to this class
1636:Aside from specifying a function's binding,
368:was the original language to make use of an
322:as a more secure alternative for this task.
1384:"print 'x + y = ', x + y"
973:Example to do the evaluation in two steps:
115:function gets data from the Internet, this
1934:programming language has a command called
502:; eval evaluated (+ 1 2 3) and returned 6.
965:"print('Hello World!')"
836:to return the result of that expression.
560:function - see below). An example in the
2074:preceded by the interrogation operator,
1048:"print('Hello ' .. a)"
2505:
1235:function takes two optional arguments,
824:Unlike some languages, the argument to
629:;; a name for the subtraction function.
349:in ActionScript 3. Both have ended, as
2020:The string argument is evaluated as a
785:). This differs from the above use of
342:ActionScript 3 does not support eval.
7:
2215:Example as an expression evaluator:
954:Example as an expression evaluator:
696:Example as an expression evaluator:
238:Example as an expression evaluator:
171:"session.update(authenticated=True)"
2598:"Volume 1 Commands and Utilities".
1124:converts the PostScript expression
298:'foo = foo + 2;alert(foo);'
79:forms), or of special type such as
25:
2281:Conversational Programming System
2243:Example as a statement executor:
2016:Release 3.2 Programmer's Manual.
1782:Most standard implementations of
878:'echo "$ foo";'
789:with strings in that code inside
736:Example as a statement executor:
564:dialect of Lisp (RRS and later):
275:Example as a statement executor:
83:(as in Python). The analog for a
1772:# evaluates to "hello"
334:(Flash's programming language),
173:as data, which would update the
2172:, including the original "sh" (
2082:error conditions. For example:
59:in the language, and returns a
2406:is to be called with argument
2078:, permits the user to control
2063:which increments the variable
1920:'Object subclass:#Foo'
783:Exception handling syntax#Perl
445:; the call to + was performed.
413:This is an example Lisp code:
384:statements. However, once the
1:
2607:. AT&T. 1986. p. 41.
1875:Visual Basic for Applications
1870:Visual Basic for Applications
1669:# evaluating within a context
1390:"compile-sample.py"
1340:example (interactive shell):
1260:example (interactive shell):
1176:example (interactive shell):
839:Unlike some languages, PHP's
2516:. 2006-10-10. Archived from
2482:simply typed lambda calculus
2313:theoretical computer science
314:text, perhaps as part of an
2531:ActionScript 3 Eval Library
2266:'$ foo += 2; $ foo'
1975:"$ i squared is "
889:Example returning a value:
653:;; Evaluate the form again.
395:Later versions of the Lisp
32:Evaluation (disambiguation)
2752:
2676:The Metacircular Evaluator
2446:. Thus, for example, the
2168:command is present in all
1861:Both VBScript and JScript
1837:, there is a class called
1295:"x += 1; y -= 1"
29:
2620:"Draft EVAL Microprogram"
2460:Cartesian closed category
2331:, and languages based on
2155:Command-line interpreters
2102:The following executes a
1801:Win32FORTH code example:
1619:Ruby programming language
1029:in favor of the existing
2601:UNIX Programmer's Manual
2466:(or, properly speaking,
2444:closed monoidal category
2376:
2345:
2245:
2217:
2112:
2084:
2038:
1944:
1911:
1895:
1803:
1721:
1642:
1577:
1531:
1433:
1342:
1262:
1178:
1146:
1126:
1110:
1039:
999:"return a + 1"
975:
956:
891:
848:
738:
698:
668:user-initial-environment
638:user-initial-environment
617:user-initial-environment
566:
521:
415:
306:One use of JavaScript's
277:
240:
167:could supply the program
121:
47:, short for the English
2297:IBM System/360 Model 50
1818:\ Outputs "4"
927:'return $ foo;'
915://does not work in PHP5
2731:Unix SUS2008 utilities
2647:Rochester, Nathaniel.
2442:is used to define the
2293:Polish-string notation
2152:
1621:interpreter offers an
797:used in this article.
777:, which serves as its
2736:IBM i Qshell commands
1786:have two variants of
903:"Goodbye, world!
213:Programming languages
191:interpreted languages
39:programming languages
2572:"PHP: eval - Manual"
2472:) together with its
2329:functional languages
2148:"no label"
1543:"int(1+1)"
846:Example using echo:
548:contains the symbol
390:read-eval-print loop
73:abstract syntax tree
2402:where the function
2283:(CPS) introduced a
2238:'$ foo + 2'
1666:# (evaluates to 2)
1633:, to be specified.
1025:Lua 5.2 deprecates
860:"Hello, world!
722:'$ foo + 2'
18:Evaluation operator
2678:(SICP Section 4.1)
2514:"Flash 8 LiveDocs"
2201:Windows PowerShell
2195:Windows PowerShell
2012:as appears in the
1484:"num++;"
1396:"single"
1330:" statement or a "
1250:statement (or the
1075:"World!"
779:exception handling
635:environment-define
351:Adobe Flash Player
199:compiled languages
119:code is insecure:
2452:cartesian product
2263:invoke-expression
2235:invoke-expression
2205:Invoke-Expression
2188:General Commands
2135:"goto "
1326:" statement, an "
1113:((Hello World) =)
382:assembly language
267:'foo + 2'
16:(Redirected from
2743:
2679:
2673:
2667:
2666:
2664:
2662:
2653:
2644:
2638:
2637:
2635:
2633:
2624:
2615:
2609:
2608:
2606:
2595:
2589:
2588:
2586:
2585:
2568:
2562:
2557:
2551:
2550:
2545:. Archived from
2543:"The D.eval API"
2539:
2533:
2528:
2522:
2521:
2510:
2448:category of sets
2422:eval-apply cycle
2398:
2395:
2392:
2389:
2386:
2383:
2380:
2370:
2367:
2364:
2361:
2358:
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2149:
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2119:
2116:
2110:(if it exists):
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2077:
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2059:
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2052:
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2008:
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1608:
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1599:
1596:
1595:"queryname.
1593:
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1021:
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997:
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988:
985:
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934:
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582:
579:
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570:
559:
555:
551:
547:
540:
537:
534:
533:read-from-string
531:
528:
525:
518:
514:
513:read-from-string
510:
503:
500:
497:
494:
491:
488:
485:
482:
479:
476:
473:
470:
467:
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461:
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437:
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431:
428:
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419:
409:
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398:
387:
379:
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371:
353:has reached its
348:
337:
321:
309:
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299:
296:
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287:
284:
281:
271:
268:
265:
262:
259:
256:
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247:
244:
234:
207:code duplication
204:
196:
180:
176:
172:
169:with the string
161:
158:
155:
152:
149:
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137:
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114:
110:
98:
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82:
70:
66:
45:
21:
2751:
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2716:
2715:
2688:
2683:
2682:
2674:
2670:
2660:
2658:
2651:
2646:
2645:
2641:
2631:
2629:
2622:
2618:Allen-Babcock.
2617:
2616:
2612:
2604:
2597:
2596:
2592:
2583:
2581:
2570:
2569:
2565:
2558:
2554:
2541:
2540:
2536:
2529:
2525:
2512:
2511:
2507:
2502:
2490:
2433:category theory
2400:
2399:
2396:
2393:
2390:
2387:
2384:
2381:
2378:
2372:
2371:
2368:
2365:
2362:
2359:
2356:
2353:
2350:
2347:
2333:lambda calculus
2309:
2288:
2285:microprogrammed
2274:
2269:
2268:
2265:
2262:
2259:
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1277:>>>
1265:>>>
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1138:
1129:(Hello World)
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2726:Control flow
2711:Rosetta Code
2671:
2659:. Retrieved
2655:
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2582:. Retrieved
2575:
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332:ActionScript
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310:is to parse
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165:An attacker
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2170:Unix shells
2160:Unix shells
1705:get_binding
1675:get_binding
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355:end-of-life
2720:Categories
2584:2015-09-10
2500:References
2458:, forms a
2335:, such as
2301:assignment
1742:class_eval
1523:ColdFusion
1518:ColdFusion
1402:x + y = 3
1101:PostScript
1096:PostScript
1027:loadstring
993:loadstring
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949:loadstring
487:; example:
320:JSON.parse
229:JavaScript
223:JavaScript
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2462:. Here,
2287:function
2272:Microcode
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1917:evaluate:
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1829:REALbasic
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1149:(file.ps)
770:also has
674:;Value: 3
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2488:See also
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2295:" on an
2276:In 1966
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1914:Compiler
1898:Compiler
1846:VBScript
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1792:EVALUATE
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1558:Evaluate
1527:evaluate
1035:upvalues
894:<?php
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139:get_data
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2661:Jan 17,
2632:Jan 17,
2456:product
2186:FreeBSD
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1363:=
1360:y
1354:1
1351:=
1348:x
1313:0
1310:y
1304:2
1301:x
1286:1
1283:=
1280:y
1274:1
1271:=
1268:x
1226:1
1223:)
1217:(
1208:2
1205:)
1199:(
1190:1
1187:=
1184:x
1132:=
1084:=
1078:,
1072:=
1069:a
1066:{
1063:,
1057:,
1051:,
1045:(
1014:f
1011:(
1002:)
996:(
990:=
987:f
984:1
981:=
978:a
962:(
924:(
912:;
900:=
875:(
869:;
857:=
756:(
750:;
747:2
744:=
731:;
719:(
710:;
707:2
704:=
671:)
659:(
647:)
644:-
632:(
620:)
608:(
593:2
590:5
587:+
584:(
572:(
550:+
530:(
524:(
499:)
490:(
478:3
475:2
472:1
469:+
466:(
454:(
439:)
436:3
433:2
430:1
427:+
424:(
295:(
289:;
286:2
283:=
264:(
258:(
252:;
249:2
246:=
160:)
154:(
148:=
136:=
127:=
34:.
20:)
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