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liana    音标拼音: [li'ɑnə]
n. 藤蔓植物

藤蔓植物

liana
n 1: a woody climbing usually tropical plant

Liane \Li*ane"\ (l[-i]*[=a]n"), Liana \Li*a"na\
(l[-i]*[=a]"n[.a]), n. [F. liane; prob. akin to lien a band,
fr. L. ligamen, fr. ligare to bind. Cf. {Lien}, n. ] (Bot.)
A luxuriant woody plant, climbing high trees and having
ropelike stems. The grapevine often has the habit of a liane.
Lianes are abundant in the forests of the Amazon region.
[1913 Webster]

54 Moby Thesaurus words for "liana":
algae, autophyte, bean, bracken, brown algae, climber, conferva,
confervoid, creeper, diatom, fern, fruits and vegetables, fucus,
fungus, grapevine, green algae, gulfweed, herb, heterophyte, ivy,
kelp, legume, lentil, lichen, liverwort, mold, moss, mushroom,
parasite, parasitic plant, pea, perthophyte, phytoplankton,
planktonic algae, plant families, puffball, pulse, red algae,
rockweed, rust, saprophyte, sargasso, sargassum, sea lentil,
sea moss, sea wrack, seaweed, smut, succulent, toadstool, vetch,
vine, wort, wrack

A {C}-like, interpretive, {object-oriented
programming} language, {class} library, and integrated
development environment designed specifically for development
of {application programs} for {Microsoft Windows} and {Windows
NT}. Designed by Jack Krupansky of
{Base Technology}, Liana was first released as a commercial
product in August 1991. The language is designed to be as
easy to use as {BASIC}, as concise as {C}, and as flexible as
{Smalltalk}.

The {OOP} {syntax} of {C} was chosen over the less familiar
syntax of {Smalltalk} and {Objective-C} to appeal to {C}
programmers and in recognition of C being the leading OOP
language. The syntax is a simplified subset of {C/C}. The
{semantics} are also a simplified subset of C/C, but
extended to achieve the flexibility of Smalltalk.

Liana is a typeless language (like {Lisp}, {Snobol} and
{Smalltalk}), which means that the datatypes of variables,
function parameters, and function return values are not needed
since values carry the type information. Hence, variables are
simply containers for values and function parameters are
simply pipes through which any type of value can flow.
{Single inheritance}, but not {multiple inheritance}, is
supported. {Memory management} is automatic using {reference
counting}.

The library includes over 150 {classes}, for {dynamic arrays},
{associative lookup} tables, windows, menus, dialogs,
controls, bitmaps, cursors, icons, mouse movement, keyboard
input, fonts, text and graphics display, {DDE}, and {MDI}.

Liana provides flexible OOP support for Windows programming.
For example, a {list box} automatically fills itself from an
associated {object}. That object is not some sort of special
object, but is merely any object that "behaves like" an array
(i.e., has a "size" member function that returns the number of
elements, a "get" function that returns the ith element, and
the text for each element is returned by calling the "text"
member function for the element).

A related product, C-odeScript, is an embeddable application
scripting language. It is an implementation of Liana which
can be called from C/C applications to dynamically evaluate
expressions and statement sequences. This can be used to
offer the end-user a macro/scripting capability or to allow
the C/C application to be customized without changing the
C/C source code.

Here's a complete Liana program which illustrates the
flexibility of the language semantics and the power of the
class library:

main
{
// Prompt user for a string.
// No declaration needed for "x" (becomes a global variable.)
x = ask ("Enter a String");

// Use "" operator to concatenate strings. Memory
// management for string temporaries is automatic. The
// "message" function displays a Windows message box.
message ("You entered: " x);

// Now x will take on a different type. The "ask_number"
// function will return a "real" if the user's input
// contains a decimal point or an "int" if no decimal
// point.
x = ask_number ("Enter a Number");

// The "" operator with a string operand will
// automatically convert the other operand to a string.

message ("You entered: " x);

// Prompt user for a Liana expression. Store it in a
// local variable (the type, string, is merely for
// documentation.)
string expr = ask ("Enter an Expression");

// Evaluate the expression. The return value of "eval"
// could be any type. The "source_format" member function
// converts any value to its source format (e.g., add
// quotes for a string.) The "class_name" member function
// return the name of the class of an object/value.
// Empty parens can be left off for member function calls.
x = eval (expr);
message ("The value of " expr " is " x.source_format
" its type is " x.class_name);
}

The author explained that the "Li" of Liana stands for
"Language interpreter" and liana are vines that grow up trees
in tropical forests, which seemed quite appropriate for a tool
to deal with the complexity of MS Windows! It is also a
woman's name.

["Liana for Windows", Aitken, P., PC TECHNIQUES, Dec/Jan
1993].

["Liana: A Language For Writing Windows Programs", Burk, R.,
Tech Specialist (R&D Publications), Sep 1991].

["Liana v. 1.0." Hildebrand, J.D., Computer Language, Dec
1992].

["Liana: A Windows Programming Language Based on C and C",
Krupansky, J., The C Users Journal, Jul 1992].

["Writing a Multimedia App in Liana", Krupansky, J.,
Dr. Dobb's Journal, Winter Multimedia Sourcebook 1994].

["The Liana Programming Language", R. Valdes, Dr Dobbs J Oct
1993, pp.50-52].

(1999-06-29)


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