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POA space is needed to let line_terminator be recognized
 

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  1. POA space is needed to let line_terminator be recognized
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    <p>In my <code>lexer.mll</code> I have declared <code>EOS</code> as follows:</p> <pre><code>let line_feed = '\n' (* %x200A *) let carriage_return = '\r' (* %x200D *) let line_terminator = line_feed | carriage_return | carriage_return line_feed (* KO: %x2028 | %x2029 *) let LINE_END = line_terminator let tab_character = '\x09' (* CHARACTER TABULATION *) let eom_character = '\x19' (* END OF MEDIUM *) let space_character = '\x20' (* SPACE *) let underscore = '\x5F' (* LOW LINE or SPACING UNDERSCORE *) let WSC = tab_character | eom_character | space_character let line_continuation = WSC* underscore WSC* line_terminator let WS = (WSC | line_continuation)+ let EOL = WS? LINE_END let EOS = EOL* rule token = parse | WS { token lexbuf } | LINE_END { newline lexbuf; token lexbuf } | EOS { EOS } </code></pre> <p>In my <code>parser.mly</code>, I have something like this:</p> <pre><code>%token EOS ... %% nonterminal : statement EOS statement { semantic-action } </code></pre> <p>I edit my <code>test_KO.txt</code> under <code>Emacs</code> as follows, it raises an error while parsing:</p> <pre><code>a_statement b_statement </code></pre> <p>However, if I add one <code>space</code> after <code>a_statement</code> as follows, it passes the parsing:</p> <pre><code>a_statement(space) b_statement </code></pre> <p>I guess the reason is <code>line_terminator</code> cannot be recognized for <code>test_KO.txt</code>, though <code>a_statemnt</code> and <code>b_statement</code> are not in the same line; <code>line_terminator</code> can be recognized if there is one <code>space</code> between them.</p> <p>Do you think adding <a href="http://www.fileformat.info/info/unicode/char/2028/index.htm" rel="nofollow">x2028</a> and <a href="http://www.fileformat.info/info/unicode/char/2029/index.htm" rel="nofollow">x2029</a> to <code>line_terminator</code> would solve the problem? As <code>ocamllex</code> probably does not support well unicode, it would be complicated to test it...</p> <p>Otherwise, is there any other solution for the problem?</p>
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    1. USSoftTimur
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    1. CODid you get your problem solved? What are the parsing rules for a_statement and b_statement? There are plenty of possibilities.
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      1. USdidierc
 

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