yabasic.xml

Linux下VB解释器

	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_if">if</link></term>
	  <listitem>
	    evaluate a condition and execute statements or not, depending on the result
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_label">label</link></term>
	  <listitem>
	    mark a specific location within your program for <function>goto</function>, <function>gosub</function> or <function>restore</function>
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_loop">loop</link></term>
	  <listitem>
	    marks the end of an infinite loop
	  </listitem>
	</varlistentry>
	
	<varlistentry>
	  <term><link linkend="ref_next">next</link></term>
	  <listitem>
	    mark the end of a for loop
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_not">not</link></term>
	  <listitem>
	    negate an expression; can be written as <function>!</function>
	  </listitem>
	</varlistentry>


	<varlistentry>
	  <term><link linkend="ref_on_gosub">on gosub</link></term>
	  <listitem>
	    jump to one of multiple <function>gosub</function>-targets
	  </listitem>
	</varlistentry>


	<varlistentry>
	  <term><link linkend="ref_on_goto">on goto</link></term>
	  <listitem>
	    jump to one of many <function>goto</function>-targets
	  </listitem>
	</varlistentry>


	<varlistentry>
	  <term><link linkend="ref_on_interrupt">on interrupt</link></term>
	  <listitem>
	    change reaction on keyboard interrupts
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_logical_or">logical or</link></term>
	  <listitem>
	    logical or, used in conditions
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_pause">pause</link></term>
	  <listitem>
	    pause, sleep, wait for the specified number of seconds
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_repeat">repeat</link></term>
	  <listitem>
	    start a <function>repeat</function>-loop
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_return">return</link></term>
	  <listitem>
	    return from a subroutine or a gosub
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_sleep">sleep</link></term>
	  <listitem>
	    pause, sleep, wait for the specified number of seconds
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_switch">switch</link></term>
	  <listitem>
	    select one of many alternatives depending on a value
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_then">then</link></term>
	  <listitem>
	    tell the long from the short form of the <function>if</function>-statement
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_true">true</link></term>
	  <listitem>
	    a constant with the value of 1
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_until">until</link></term>
	  <listitem>
	    end a <function>repeat</function>-loop
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_wait">wait</link></term>
	  <listitem>
	    pause, sleep, wait for the specified number of seconds
	  </listitem>
	</varlistentry>


	<varlistentry>
	  <term><link linkend="ref_wend">wend</link></term>
	  <listitem>
	    end a <function><link linkend="ref_while">while</link></function>-loop
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_while">while</link></term>
	  <listitem>
	    start a <function>while</function>-loop
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_colon">:</link></term>
	  <listitem>
	    separate commands from each other
	  </listitem>
	</varlistentry>

      </variablelist>
    </sect1>

    <sect1 renderas="sect2" id="top_data">
      <title>Data keeping and processing</title>
      <variablelist>

	<varlistentry>
	  <term><link linkend="ref_arraydim">arraydim()</link></term>
	  <listitem>
	    returns the dimension of the array, which is passed as an <link linkend="ref_array_references">array reference</link>
	  </listitem>
	</varlistentry>


	<varlistentry>
	  <term><link linkend="ref_arraysize">arraysize()</link></term>
	  <listitem>
	    returns the size of a dimension of an array
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_data">data</link></term>
	  <listitem>
	    introduces a list of data-items
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_dim">dim</link></term>
	  <listitem>
	    create an array prior to its first use
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_read">read</link></term>
	  <listitem>
	    read data from <function>data</function>-statements
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_redim">redim</link></term>
	  <listitem>
	    create an array prior to its first use. A synonym for <function>dim</function>
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_restore">restore</link></term>
	  <listitem>
	    reposition the <function>data</function>-pointer
	  </listitem>
	</varlistentry>

      </variablelist>
    </sect1>

    <sect1 renderas="sect2" id="top_strings">
      <title>String processing</title>
      <variablelist>
	
	<varlistentry>
	  <term><link linkend="ref_asc">asc()</link></term>
	  <listitem>
	    accepts a string and returns the position of its first character within the <acronym>ascii</acronym> charset
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_chr">chr$()</link></term>
	  <listitem>
	    accepts a number and returns the character at this position within the <acronym>ascii</acronym> charset
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_glob">glob()</link></term>
	  <listitem>
	    check if a string matches a simple pattern
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_hex">hex$()</link></term>
	  <listitem>
	    convert a number into hexadecimal
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_instr">instr()</link></term>
	  <listitem>
	    searches its second argument within the first; returns its position if found
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_left">left$()</link></term>
	  <listitem>
	    return (<emphasis>or change</emphasis>) left end of a string
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_len">len()</link></term>
	  <listitem>
	    return the length of a string
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_lower">lower$()</link></term>
	  <listitem>
	    convert a string to lower case
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_ltrim">ltrim$()</link></term>
	  <listitem>
	    trim spaces at the left end of a string
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_mid">mid$()</link></term>
	  <listitem>
	    return (<emphasis>or change</emphasis>) characters from within a string
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_right">right$()</link></term>
	  <listitem>
	    return (<emphasis>or change</emphasis>) the right end of a string
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_split">split()</link></term>
	  <listitem>
	    split a string into many strings
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_str">str$()</link></term>
	  <listitem>
	    convert a number into a string
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_token">token()</link></term>
	  <listitem>
	    split a string into multiple strings
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_trim">trim$()</link></term>
	  <listitem>
	    remove leading and trailing spaces from its argument
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_upper">upper$()</link></term>
	  <listitem>
	    convert a string to upper case
	  </listitem>
	</varlistentry>

	<varlistentry>
	  <term><link linkend="ref_val">val()</link></term>
	  <listitem>
	    converts a string to a number
	  </listitem>
	</varlistentry>

      </variablelist>
    </sect1>