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<h2 title="Class Compiler" class="title">Class Compiler</h2>
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<li>java.lang.Object</li>
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<pre>public class <span class="typeNameLabel">Compiler</span>
extends <a href="../../../ch/wlkl/wsh/Top.html" title="class in ch.wlkl.wsh">Top</a></pre>
<div class="block">compiles shell or data syntax to javaCode and a temporary JavaClass, subclass of <a href="../../../ch/wlkl/wsh/Run.html" title="class in ch.wlkl.wsh"><code>Run</code></a> and loads it into the virtual machine.
<br><br><b>Attention:</b> java implements an old version of wsh, <a href="https://www.wlkl.ch/index.php/Inf/WshSyn">the rexx version</a> contains much innovation since then.
<h1>The main feature of this shell language</h1>
<ul>
<li>standard input and ouput with a unix-shell like syntax, to the file system, temporary buffers and heredata
<li>piping of statemts (using the output of one statement as input for the next)
<li>variable expansion in heredata or java
<li>integration with java, but the design is as much language independent as possible, there is a version z/OS REXX under construction
</ul>
<h1>Shell Syntax</h1>
<ul>
<li id="syData"><B>data = (spCom* | exprD) (nl exprD)* (nl spCom*)? ((stmt | input) data)*</B>
<br>data consists of literal data line interpersed with variable expansions, input from files or heredata and statements.
Partial lines are ignored, if they consist only of spaces and comments.
<li id="syShell"><B>shell = pipe ? ('$;' pipe?)*</B>
<br>Pipes separated by $;. Caution: Semicolons without $ do not terminate a pipe but are part of the underlying language.
<li id="syExpr"><B>exprD = (( notDoNl | primary ) comment* )+</B>
<br>expressions consists of notDoNl interpreted litaral constants and primaries, comments are ignored.
<li><B>exprS = spCom* exprD spCom*</B>
<br>a flavour of expression ignoring leading and trailing spaces
<li><B>exprW = spCom* (( shWord | primary ) comment* )+ spCom*</B>
<br>a flavour of expression ignoring leading and trailing spaces and text only words
<li id=syLang><B>lang = (( notDoNl | primary ) comment* )+</B>
<br> syntactically the same as <B>exprD</B>, however <B>notDoNl</B> is interpreted as language source. This may yield a java expression or java statements. Comments are replaced by a single space.
<li id=syPrimary><B>primary = vars | string | '$(' lang '$)' | '$-[' data '$]' | '$-{' shell '$}' | $-compShell | $-compData</B>
<br>the $-comp... primaries compile standard input as shell, respectively data and return the resulting instance of <a href="../../../ch/wlkl/wsh/Run.html" title="class in ch.wlkl.wsh"><code>Run</code></a>
<li><B>vars = '$' shName | '${' ('?' | '>')? exprW colCla? '}'</B>
<br>retrieves the contents of a variable from the variable pool, tests its existence or reads from std input, see <A hRef=#seVars>semantics</A>
<li><B>colCla = spCom ':' spCom shWord</B>S
<li id=syInput><b>input = '$<' ioOpts exprS | hereData</b>
<li id=syHereData><b>hereData = '$<<' ioOpts shWord sp* (nl notNl*)* nl shWord</b>
<li> <b>output = ('$>' | '$>>' | '$&') ioOpts exprS</b>
<li> <b>ioOpts = '+'? '-'? ( '?' | '#' | '&' | '[' | '{' )? </b>
<br> option characters to specify the meaning of exprS fileName see <A href=#seIoOpts>semantics</A>
<li id=syPipe><B>pipe = ((input | output) spNlCom*)* (stmts ( '$|' colCla? stmts)*)?</b>
<br>this is execution order, syntax order is free
<li id=syStmts><B>stmts = ((stmt | lang) spNlCom*)+</b>
<li id=syStmt><b>stmt = ass | '$@{' shell '$}' | '$[' data '$]'| '$$' exprS | '$?' lang |'$@for' exprW colCla? stmt | '$@run' primary</b>
<li><b>ass = '$=' exprW colCla? ( '=' exprS | '?' lang)</B>
</ul>
<h1>Lexicals</h1>
<ul>
<li><b>string = '$''' ((* notNl not '''' *) | '''''')* '''' | '$?' ((* notNl not '?' *) | '??')* '?''</b>
<br>a string enclosed in single or double quotes, prefixed by a dollar. Inside, two quotes stand for a single one.
<li><b>shName = (* starting with a letter followed by any number of digits or characters *)</b>
<li><b>shWord = (* 1 or more characters not sp, nl, {, }, =, ? or : *)</b>
<br>
<li><b>spNlCom = nl | sp | comment</b>
<li><b>spCom = sp | comment</b>
<li><b> comment = '$**' notNl* | '$*+' notNl* nl | '$*(' (comment | hereData | string | char)* '$*)'</b>
<br>
<li> notDoNl = (* one character from notNl but not '$' *)
<li> notNl = (* one character not nl *)
<li> nl = (* newLine character(s) or record switch *)
<li id="sySp"> sp = (* one space character ' ', tab etc., but not nl *)
</ul>
<h1>Semantics</h1>
The run of a program fragment has the following effects
<ul>
<li>it reads from standard input
<li>it writes to standard output
<li>it accesses and updates the variable pool
<li>runs java code either from <b>lang</b> constructs or by method calls from the accesses to the variable pool
</ul>
The semantics of the syntactical constructs
<ul>
<li><b>data</b> writes in the given sequence to standard output: expressions, the output of statements and the contents of inputs.
<li><b>shell</b> writes the output of its pipes to standard output.
<li><b>exprD, exprS, exprW</b> if it constists of a single primary returns this primary otherwise a String consisting of the concatenation of each primary and literal
<li><B>primary</B> yields a String or an instance of another java class.
<ul><li id=seVars><B>vars</B> retrieves the contents of a variable from the variable pool, tests its existence or reads from std input. Nesting is supported. The function depends on the options:
<ul>
<li> <B>?</B> returns a boolean, whether the variable named exprW is defined in the variable pool.
<li> <B>></B> reads from standard input and puts the line read into the variable named exprW. returns false at end of file.
<li> <B>neither</B> returns the contents of the variable named exprW or fails if it is undefined
<li> <B>colCla</B> returns an object of the specified class, if not specified shell infers the type
</ul>
<li><B>string</B> a string constant
<li><B>'$(' lang '$)'</B> lang must be a java expression. Yields the object (of any class) of this java expression.
<li><B>'$-[' data '$]'</B> yields a string: the concatenation of all lines of data, separated by a single space.
<li><B>$-{' shell '$}'</B> yields a string: shell is exececuted and the lines of its standard output concatenated, separated by a single space.
<li><B>$-compShell, $-compData</B> compiles standard input as shell, respectively data yields the resulting instance of <a href="../../../ch/wlkl/wsh/Run.html" title="class in ch.wlkl.wsh"><code>Run</code></a>
</ul>
<li><b>colCla</b> designates the type (class) of an expression or declares the type of a variable. see <A hRef=#Typing>Typing</A>
<li><b>input</b> in a statment copies the specified <a href="../../../ch/wlkl/wsh/Read.html" title="interface in ch.wlkl.wsh"><code>Read</code></a>, File, etc. to std output. As a io redirection of a pipe defines (std) input.
<li><b>hereData</b> the following source lines are used as input, depending on ioOpts literally or compiled.
<li><b>output</b> In a io redirection of a pipe defines (std) output.
<li id=seIoOpts><b>ioOpts</b> option characters to specify the meaning of the subsequent exprW. Which options are valid is contextdependent.
<br>general
<ul>
<li> <B>+</B> for input: concatenenate this input with the next input, for an external FD reroute the following inputOutput to this external FD
<li> <B>-</B> do not open and close an inputOutput, do not allocate and deallocate an external FD
</ul>
not for hereData see <a href="../../../ch/wlkl/wsh/Cat.html#make-java.lang.String-java.lang.Object-"><code>Cat.make(String, Object)</code></a>
<ul>
<li> <B>?</B> exprS yields a languge Object that will be transformed to an <a href="../../../ch/wlkl/wsh/OpenClose.html" title="interface in ch.wlkl.wsh"><code>OpenClose</code></a> by <a href="../../../ch/wlkl/wsh/Cat.html#make-java.lang.String-java.lang.Object-"><code>Cat.make(String, Object)</code></a>
<li> <B>&</B> exprS is a String specification of an external FD
<li> <B>#</B> exprS is a name in the variable pool. If it does not exist, a new Buf<String> is put there. If it exists the retrieved value is interpreted as with the ? option.
<li> otherwise exprS is a filename of the external file system
</ul>
only for hereData
<ul>
<li> <B>[</B> interpret this hereData as <A hRef=#syData>data</A>
<li> <B>{</B> interpret this hereData as <A hRef=#syShell>shell</A>
<li> otherwise this hereData is interpreted literally
</ul>
<li><B>pipe</B> a pipe. input get std input (which may consist of a concatenation) of the whole pipe (, output std output. Additionally external FD may be allocated for the duration of the whole pipe. $| stands for the rerouting of std output of the previous stmts with std input of the following stmts.
<li><B>stmts</B> java code interpreted as java statements possibly interpersed with stmt.
<li><B>stmt</B> a shell statement is
<ul><li><B>ass</B> assigns a variable in the variable pool.
<li><B>'$@{' shell '$}'</B> is a block simply executing the shell.
<li><B>'$@[' data '$]'</B> writes data to std output.
<li><B>'$$', '$?'</B> write the subsequent shell respectively language expression to std output.
<li><B>$@for</B> read std input until end of input. For each object execute the subsequent statement after assigning the object read to the variable name exprW.
<li><B>$@run</B> the expression must yield an instance of <a href="../../../ch/wlkl/wsh/Run.html" title="class in ch.wlkl.wsh"><code>Run</code></a> which is run.
</ul>
</ul>
<h1 id=Typing>Typing</h1>
<ul>
<li>The $| operator with the <B>colCla</B> defines the type of standard output within this pipe fragment.
<li>The of a constant variable name of the variable pool is remember when the <B>colCla</B> option is used in the assignment, or the type of the expression can be deduced. The type is remembered in the following text.
<li>the type of an expression of a single primary is the type of the primary, for all other expression it is String
</ul>
<h1>Tutorial</h1>
<h1>Plans, toDo</h1>
<ul>
<li>simple include facility and general compileTime processing and generating permanent named classes
<li> Env or EnvMan without typing?
</ul></div>
</li>
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<h3>Fields inherited from class ch.wlkl.wsh.<a href="../../../ch/wlkl/wsh/Top.html" title="class in ch.wlkl.wsh">Top</a></h3>
<code><a href="../../../ch/wlkl/wsh/Top.html#emptyStrings">emptyStrings</a>, <a href="../../../ch/wlkl/wsh/Top.html#trace">trace</a></code></li>
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<h3>Constructor Summary</h3>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../ch/wlkl/wsh/Compiler.html#Compiler-ch.wlkl.wsh.JavaCmpLoad-ch.wlkl.wsh.Read-">Compiler</a></span>(<a href="../../../ch/wlkl/wsh/JavaCmpLoad.html" title="class in ch.wlkl.wsh">JavaCmpLoad</a><?> ldr,
<a href="../../../ch/wlkl/wsh/Read.html" title="interface in ch.wlkl.wsh">Read</a><java.lang.String> src)</code> </td>
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<h3>Method Summary</h3>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>java.lang.Class<? extends <a href="../../../ch/wlkl/wsh/Run.html" title="class in ch.wlkl.wsh">Run</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../ch/wlkl/wsh/Compiler.html#compileClass-char-java.lang.String-">compileClass</a></span>(char type,
java.lang.String name)</code>
<div class="block">compile a subclass of <tt>Run</tt></div>
</td>
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<td class="colFirst"><code>java.lang.Class<? extends <a href="../../../ch/wlkl/wsh/Run.html" title="class in ch.wlkl.wsh">Run</a>></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../ch/wlkl/wsh/Compiler.html#compileClassCatch-char-java.lang.String-">compileClassCatch</a></span>(char type,
java.lang.String name)</code>
<div class="block">return <a href="../../../ch/wlkl/wsh/Compiler.html#compileClass-char-java.lang.String-"><code>compileClass(char, String)</code></a> or null if an exception is catched</div>
</td>
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<td class="colFirst"><code><a href="../../../ch/wlkl/wsh/Run.html" title="class in ch.wlkl.wsh">Run</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../ch/wlkl/wsh/Compiler.html#compileInstance-char-">compileInstance</a></span>(char type)</code>
<div class="block">return an instance of a newly compiled subclass of <a href="../../../ch/wlkl/wsh/Run.html" title="class in ch.wlkl.wsh"><code>Run</code></a></div>
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<h3>Methods inherited from class ch.wlkl.wsh.<a href="../../../ch/wlkl/wsh/Top.html" title="class in ch.wlkl.wsh">Top</a></h3>
<code><a href="../../../ch/wlkl/wsh/Top.html#fail-java.lang.String-">fail</a>, <a href="../../../ch/wlkl/wsh/Top.html#name-java.lang.Object-">name</a>, <a href="../../../ch/wlkl/wsh/Top.html#nameCnt-int-">nameCnt</a>, <a href="../../../ch/wlkl/wsh/Top.html#say-java.lang.String-">say</a>, <a href="../../../ch/wlkl/wsh/Top.html#sFail-java.lang.Object-java.lang.String-">sFail</a>, <a href="../../../ch/wlkl/wsh/Top.html#sFail-java.lang.String-">sFail</a>, <a href="../../../ch/wlkl/wsh/Top.html#sSay-java.lang.Object-java.lang.String-">sSay</a>, <a href="../../../ch/wlkl/wsh/Top.html#sSay-java.lang.String-">sSay</a>, <a href="../../../ch/wlkl/wsh/Top.html#sTrc-java.lang.Object-java.lang.String-">sTrc</a>, <a href="../../../ch/wlkl/wsh/Top.html#sTrc-java.lang.String-">sTrc</a>, <a href="../../../ch/wlkl/wsh/Top.html#toString--">toString</a>, <a href="../../../ch/wlkl/wsh/Top.html#trc-java.lang.String-">trc</a></code></li>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
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<h4>Compiler</h4>
<pre>public Compiler(<a href="../../../ch/wlkl/wsh/JavaCmpLoad.html" title="class in ch.wlkl.wsh">JavaCmpLoad</a><?> ldr,
<a href="../../../ch/wlkl/wsh/Read.html" title="interface in ch.wlkl.wsh">Read</a><java.lang.String> src)</pre>
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<h4>compileInstance</h4>
<pre>public <a href="../../../ch/wlkl/wsh/Run.html" title="class in ch.wlkl.wsh">Run</a> compileInstance(char type)</pre>
<div class="block">return an instance of a newly compiled subclass of <a href="../../../ch/wlkl/wsh/Run.html" title="class in ch.wlkl.wsh"><code>Run</code></a></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>type</code> - type for <a href="../../../ch/wlkl/wsh/Compiler.html#compileClass-char-java.lang.String-"><code>compileClass(char, String)</code></a></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the new instance of the newly compiled subclass of <a href="../../../ch/wlkl/wsh/Run.html" title="class in ch.wlkl.wsh"><code>Run</code></a></dd>
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<h4>compileClassCatch</h4>
<pre>public java.lang.Class<? extends <a href="../../../ch/wlkl/wsh/Run.html" title="class in ch.wlkl.wsh">Run</a>> compileClassCatch(char type,
java.lang.String name)</pre>
<div class="block">return <a href="../../../ch/wlkl/wsh/Compiler.html#compileClass-char-java.lang.String-"><code>compileClass(char, String)</code></a> or null if an exception is catched</div>
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<h4>compileClass</h4>
<pre>public java.lang.Class<? extends <a href="../../../ch/wlkl/wsh/Run.html" title="class in ch.wlkl.wsh">Run</a>> compileClass(char type,
java.lang.String name)</pre>
<div class="block">compile a subclass of <tt>Run</tt></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>type</code> - type for <a href="../../../ch/wlkl/wsh/Compiler.html#compileSrc-char-"><code>compileSrc(char)</code></a></dd>
<dd><code>name</code> - the name of the class (may include package), if null a unique name is generated</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the compiled class</dd>
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