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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>Index</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,&quot;tocview_0&quot;);">&#9660;</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x">Parser Tools:<span class="mywbr"> &nbsp;</span> <span class="stt">lex</span> and <span class="stt">yacc</span>-<wbr></wbr>style Parsing</a></td></tr></table></div><div class="tocviewsublistonly" style="display: block;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1&nbsp;</td><td><a href="Lexers.html" class="tocviewlink" data-pltdoc="x">Lexers</a></td></tr><tr><td align="right">2&nbsp;</td><td><a href="LALR_1__Parsers.html" class="tocviewlink" data-pltdoc="x">LALR(1) Parsers</a></td></tr><tr><td align="right">3&nbsp;</td><td><a href="Context-Free_Parsers.html" class="tocviewlink" data-pltdoc="x">Context-<wbr></wbr>Free Parsers</a></td></tr><tr><td align="right">4&nbsp;</td><td><a href="Converting_yacc_or_bison_Grammars.html" class="tocviewlink" data-pltdoc="x">Converting <span class="stt">yacc</span> or <span class="stt">bison</span> Grammars</a></td></tr><tr><td align="right"></td><td><a href="" class="tocviewselflink" data-pltdoc="x">Index</a></td></tr></table></div></div></div></div><div class="maincolumn"><div class="main"><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, &quot;6.1&quot;, &quot;../&quot;);" onfocus="this.style.color=&quot;black&quot;; this.style.textAlign=&quot;left&quot;; if (this.value == &quot;...search manuals...&quot;) this.value=&quot;&quot;;" onblur="if (this.value.match(/^ *$/)) { 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class="RktStxLink">*</span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex-sre..rkt%29._%2A%2A%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">**</span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex-sre..rkt%29._%2B%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">+</span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex-sre..rkt%29._-%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink"><span class="nobreak">-</span></span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex-sre..rkt%29._%2F%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">/</span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex-sre..rkt%29._~3a%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">:</span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex-sre..rkt%29._~3d%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">=</span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex-sre..rkt%29._~3e~3d%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">&gt;=</span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex-sre..rkt%29._~3f%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">?</span></span><br/></a><a name="alpha:A"></a><span><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._alphabetic%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">alphabetic</span></span><br/></a></span><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._any-char%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">any-char</span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._any-string%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">any-string</span></span><br/></a><a name="alpha:B"></a><span><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._blank%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">blank</span></span><br/></a></span><a name="alpha:C"></a><span><a href="Context-Free_Parsers.html#%28form._%28%28lib._parser-tools%2Fcfg-parser..rkt%29._cfg-parser%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">cfg-parser</span></span><br/></a></span><a href="Context-Free_Parsers.html" class="indexlink" data-pltdoc="x">cfg-parser<br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._char-set%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">char-set</span></span><br/></a><a href="Context-Free_Parsers.html" class="indexlink" data-pltdoc="x">Context-Free Parsers<br/></a><a href="Converting_yacc_or_bison_Grammars.html" class="indexlink" data-pltdoc="x">Converting <span class="stt">yacc</span> or <span class="stt">bison</span> Grammars<br/></a><a href="Lexers.html#%28part._.Creating_a_.Lexer%29" class="indexlink" data-pltdoc="x">Creating a Lexer<br/></a><a name="alpha:D"></a><span><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._define-empty-tokens%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define-empty-tokens</span></span><br/></a></span><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._define-lex-abbrev%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define-lex-abbrev</span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._define-lex-abbrevs%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define-lex-abbrevs</span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._define-lex-trans%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define-lex-trans</span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._define-tokens%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">define-tokens</span></span><br/></a><a name="alpha:E"></a><span><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._end-pos%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">end-pos</span></span><br/></a></span><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex-plt-v200..rkt%29._epsilon%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">epsilon</span></span><br/></a><a 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class="RktSym"><span class="RktStxLink">iso-control</span></span><br/></a><a name="alpha:L"></a><span><a href="LALR_1__Parsers.html" class="indexlink" data-pltdoc="x">LALR(1) Parsers<br/></a></span><a href="Lexers.html" class="indexlink" data-pltdoc="x">lex<br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._lexeme%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">lexeme</span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._lexer%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">lexer</span></span><br/></a><a href="Lexers.html#%28tech._lexer._abbreviation%29" class="indexlink" data-pltdoc="x"><span style="font-style: italic">lexer abbreviation</span><br/></a><a href="Lexers.html#%28part._.Lexer_.Abbreviations_and_.Macros%29" class="indexlink" data-pltdoc="x">Lexer Abbreviations and Macros<br/></a><a 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data-pltdoc="x"><span class="RktSym"><span class="RktValLink">make-position</span></span><br/></a></span><a href="Lexers.html#%28def._%28%28lib._parser-tools%2Flex..rkt%29._make-position-token%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">make-position-token</span></span><br/></a><a name="alpha:N"></a><span><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._nothing%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">nothing</span></span><br/></a></span><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._numeric%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">numeric</span></span><br/></a><a name="alpha:O"></a><span><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex-sre..rkt%29._or%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">or</span></span><br/></a></span><a name="alpha:P"></a><span><a href="LALR_1__Parsers.html#%28form._%28%28lib._parser-tools%2Fyacc..rkt%29._parser%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">parser</span></span><br/></a></span><a href="index.html" class="indexlink" data-pltdoc="x">Parser Tools: <span class="stt">lex</span> and <span class="stt">yacc</span>-style Parsing<br/></a><a href="Context-Free_Parsers.html" class="indexlink" data-pltdoc="x"><span class="RktModLink"><span class="RktSym">parser-tools/cfg-parser</span></span><br/></a><a href="Lexers.html" class="indexlink" data-pltdoc="x"><span class="RktModLink"><span class="RktSym">parser-tools/lex</span></span><br/></a><a href="Lexers.html#%28mod-path._parser-tools%2Flex-plt-v200%29" class="indexlink" data-pltdoc="x"><span class="RktModLink"><span class="RktSym">parser-tools/lex-plt-v200</span></span><br/></a><a href="Lexers.html#%28mod-path._parser-tools%2Flex-sre%29" class="indexlink" data-pltdoc="x"><span class="RktModLink"><span class="RktSym">parser-tools/lex-sre</span></span><br/></a><a href="LALR_1__Parsers.html" class="indexlink" data-pltdoc="x"><span class="RktModLink"><span class="RktSym">parser-tools/yacc</span></span><br/></a><a href="Converting_yacc_or_bison_Grammars.html" class="indexlink" data-pltdoc="x"><span class="RktModLink"><span class="RktSym">parser-tools/yacc-to-scheme</span></span><br/></a><a href="Lexers.html#%28def._%28%28lib._parser-tools%2Flex..rkt%29._position%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">position</span></span><br/></a><a href="Lexers.html#%28def._%28%28lib._parser-tools%2Flex..rkt%29._position-col%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">position-col</span></span><br/></a><a href="Lexers.html#%28def._%28%28lib._parser-tools%2Flex..rkt%29._position-line%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">position-line</span></span><br/></a><a href="Lexers.html#%28def._%28%28lib._parser-tools%2Flex..rkt%29._position-offset%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">position-offset</span></span><br/></a><a href="Lexers.html#%28def._%28%28lib._parser-tools%2Flex..rkt%29._position-token%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">position-token</span></span><br/></a><a href="Lexers.html#%28def._%28%28lib._parser-tools%2Flex..rkt%29._position-token-end-pos%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">position-token-end-pos</span></span><br/></a><a href="Lexers.html#%28def._%28%28lib._parser-tools%2Flex..rkt%29._position-token-start-pos%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">position-token-start-pos</span></span><br/></a><a href="Lexers.html#%28def._%28%28lib._parser-tools%2Flex..rkt%29._position-token-token%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">position-token-token</span></span><br/></a><a href="Lexers.html#%28def._%28%28lib._parser-tools%2Flex..rkt%29._position-token~3f%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">position-token?</span></span><br/></a><a href="Lexers.html#%28def._%28%28lib._parser-tools%2Flex..rkt%29._position~3f%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">position?</span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._punctuation%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">punctuation</span></span><br/></a><a name="alpha:R"></a><span><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._return-without-pos%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">return-without-pos</span></span><br/></a></span><a name="alpha:S"></a><span><a href="Lexers.html" class="indexlink" data-pltdoc="x">scanner<br/></a></span><a href="Lexers.html" class="indexlink" data-pltdoc="x">scanning<br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex-sre..rkt%29._seq%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">seq</span></span><br/></a><a href="Lexers.html#%28form._%28%28lib._parser-tools%2Flex..rkt%29._start-pos%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktStxLink">start-pos</span></span><br/></a><a href="Lexers.html#%28def._%28%28lib._parser-tools%2Flex..rkt%29._struct~3aposition%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">struct:position</span></span><br/></a><a href="Lexers.html#%28def._%28%28lib._parser-tools%2Flex..rkt%29._struct~3aposition-token%29%29" class="indexlink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">struct:position-token</span></span><br/></a><a 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