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POString literal recognition problem
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  1. POString literal recognition problem
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    copied!<p>I'm trying to recognize <strong>string literal</strong> by reading string <strong>per symbol</strong>. Example of my <strong>scanner skeleton</strong>: </p> <pre><code>public sealed class Scanner { // some class inner implementations /// &lt;summary&gt; /// /// &lt;/summary&gt; /// &lt;param name="Line"&gt;&lt;/param&gt; /// &lt;param name="LineNumber"&gt;&lt;/param&gt; public void Run(String Line, Int32 LineNumber) { var ChPosition = default(Int32); var ChCurrent = default(Char); var Value = new StringBuilder(); while (default(Char) != Line.ElementAtOrDefault&lt;Char&gt;(ChPosition)) { ChCurrent = Line.ElementAtOrDefault&lt;Char&gt;(ChPosition); #region [Whitespace] if (Char.IsWhiteSpace(ChCurrent)) { ChPosition++; } #endregion else { switch (ChCurrent) { #region [String Literal (")] case '"': { // skipping " sign, include only string inner value ChCurrent = Line.ElementAtOrDefault&lt;Char&gt;(++ChPosition); // ...? Problematic place!!! this.Tokens.Enqueue(new SharedEntities.Token { Class = SharedEntities.Token.TokenClass.StringLiteral, Value = Value.ToString() } ); Value.Clear(); ChPosition++; break; } #endregion { throw new ScanningException( "&lt;syntax_error#" + ChCurrent.ToString() + "&gt;\n" + "Unsupported character appeared at: {ln: " + LineNumber.ToString() + "; pos: " + (ChPosition + 1).ToString() + "}" ); } } // [switch(ChCurrent)] } // [if(Char.IsWhiteSpace(ChCurrent))...else] } // [while(default(Char) != Line.ElementAtOrDefault&lt;Char&gt;(ChPosition))] } // [public void Run(String Line, Int32 LineNumber)] } // [public sealed class Scanner] </code></pre> <p>My target is to parse pascal-like string: "{<em>everything enclosed</em>, <em>but</em> ", <em>only</em> "" <em>pair is allowed</em>}".</p>
 

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