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Integrated language processor in Java Creation Code 128B in Java Integrated language processor




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Example 1.2 using barcode maker for jar control to generate, create code 128 image in jar applications. GS1 DataBar bar codes Integrated language processor Borland JBuilder is a ful ly integrated language processor for Java, consisting of an editor, a compiler, and other facilities. The user issues commands to open, edit, compile, and run the program. These commands may be selected from pull-down menus, or from the keyboard.

The editor is tailored to Java. It assists with the program layout using indentation, and it distinguishes between Java keywords, literals and comments using color. The editor is also fully integrated with the visual interface construction facilities of JBuilder.

The compiler is integrated with the editor. When the user issues the "compile" command, and the program is found to contain a compile-time error, the erroneous phrase is highlighted, ready for immediate editing. If the program contains several errors, then the compiler will list all of them, and the user can select a particular error message and have the relevant phrase highlighted.

The object program is also integrated with the editor. If the program fails at runtime, the failing phrase is highlighted. (Of course, this phrase is not necessarily the one that contains the logical error.

But it would be unreasonable to expect the language processor to debug the program automatically !). Introduction widely understood. But co ntextual constraints and semantics are usually specified informally, because their formal specification is more difficult, and the available notations are not yet widely understood. A typical language specification, with formal syntax but otherwise informal, may be found in Appendix B.

. 1.3.1 Syntax Syntax is concerned with the form of programs. We can specify the syntax of a programming language formally by means of a context-free grammar. This consists of the following elements:.

A finite set of terminal code-128c for Java symbols (or just terminals). These are atomic symbols, the ones we actually enter at the keyboard when composing a program in the language. Typical examples of terminals in a programming language"s grammar are ">=", " w h i l e " , and "; ".

. A finite set of nontermin al symbols (or just nonteminals). A nonterminal symbol represents a particular class of phrases in the language. Typical examples of nonterminals in a programming language"s grammar are Program, Command, Expression, and Declaration.

. A start symbol, which is awt code128b one of the nonterminals. The start symbol represents the principal class of phrases in the language. Typically the start symbol in a programming language"s grammar is Program.

. A finite set of productio n rules. These define how phrases are composed from terminals and subphrases..

Grammars are usually writ Code 128B for Java ten in the notation BNF (Backus-Naur Form). In BNF, a production rule is written in the form N ::= a, where N is a nonterminal symbol, and where a is a (possibly empty) string of terminal andlor nonterminal symbols. Several production rules with a common nonterminal on their left-hand sides:.

may be grouped as:. The BNF symbol "::=" is p code 128 barcode for Java ronounced "may consist of", and tively".. is pronounced "or alterna-. Example 1.3 Mini-Triangle syntax Mini-Triangle is a toy pr ogramming language that will serve as a running example here and elsewhere. (It is a subset of Triangle, the language to be introduced in Section 1.4.

). Introduction Expression primary-Expression Expres awt code-128c sion Operator primary-Expression Integer-Literal V-name Operator primary-Expression ( Expression ). V-name Declaration ldentifier single-Declaration Declaration ;single-Declaration const ldentifier Expression var ldentifier :Type-denoter Type-denoter Operator ldentifier Integer-Literal Comment ldentifier +1-1*1/1<1>1=1\ Letter I ldentifier Letter I ldentifier Digit Digit 1 Integer-Literal Digit ! Graphic* eol Production rule (1.30 tel ls us that a single-command may consist of the terminal symbol "begin", followed by a command, followed by the terminal symbol "end". Production rule (1.

3a) tells us that a single-command may consist of a value-orvariable-name, followed by the terminal symbol " :=", followed by an expression.. A value-or-variable-name, Code 128 Code Set A for Java represented by the nonterminal symbol V-name, is the name of a declared constant or variable. Production rule (1.6) tells us that a value-orvariable-name is just an identifier.

(More complex value-or-variable-names can be written in full Triangle.). Production rules (1.2a-b) tell us that a command may consist of a single-command alone, or alternatively it may consist of a command followed by the terminal symbol " ;" followed by a single-command. In other words, a command consists of a sequence of one or more single-commands separated by semicolons.

In production rules (1.1 la-c), (1.12a-b), and (1.

13): eol stands for an end-of-line "character"; Letter stands for one of the lowercase letters " " "b",.., or a, .

Digitstandsforoneofthedigits "O", "l", ...

, or"9"; Graphic stands for a space or visible character. The nonterminals Letter, Digit, and Graphic each represents a set of single characters. Specifying them formally is simple but tedious, for example:.

"2";.
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