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PODefine <LINE-START> and <LINE-END> in a lexer
 

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    <p>I am trying to implement a front end which attempts to conform to a subset of <a href="http://download.microsoft.com/download/0/a/6/0a6f7755-9af5-448b-907d-13985accf53e/%5bMS-VBAL%5d.pdf">this specification</a>.</p> <p>It seems that many things are clearly defined in the reference, except <code>&lt;LINE-START&gt;</code> and <code>&lt;LINE-END&gt;</code>, which are nevertheless often used. </p> <p>Here is a citation: "For ease of specification it is convenient to be able to explicitly refer to the point that immediately precedes the beginning of a logical line and the point immediately preceding the final line-terminator of a logical line. This is accomplished using <code>&lt;LINE-START&gt;</code> and <code>&lt;LINE-END&gt;</code> as terminal symbols of the VBA grammars. A <code>&lt;LINE-START&gt;</code> is defined to immediately precede each logical line and a <code>&lt;LINE-END&gt;</code> is defined as replacing the <code>&lt;line-terminator&gt;</code> at the end of each logical line:"</p> <p>Here are some examples:</p> <pre><code>line-terminator = (%x000D %x000A) / %x000D / %x000A / %x2028 / %x2029 line-continuation = *WSC underscore *WSC line-terminator WS = 1*(WSC / line-continuation) EOL = [WS] LINE-END logical-line = LINE-START *extended-line LINE-END if-statement = LINE-START “If” boolean-expression “Then” EOL statement-block *[else-if-block] [else-block] LINE-START ((“End” “If”) / “EndIf”) else-if-block = LINE-START “ElseIf” boolean-expression “Then” EOL LINE-START statement-block else-block = LINE-START “Else” statement-block </code></pre> <p>Does anyone know where and how to define <code>&lt;LINE-START&gt;</code> and <code>&lt;LINE-END&gt;</code>?</p>
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    1. COWelcome to rolling your own lexer and parser, based on real documents. Much of the energy that goes into implementing such devices is caused by the lack of precision of specification, followed by the differences in the real implementation vs. whatever was specified, which you get to discover and fix by trial and error.
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