[email protected] wrote:
Last time I suggested an ugly regexp definition for
javascript.lang to avoid matching /* */ comments:
http://lists.gnu.org/archive/html/help-source-highlight/2008-09/msg00000.html
On second thought (or third thought) I don't like this because it
matches cases where there are two division operators in a single
expression, such as:
document.write('<table><tr><td>25% = '+(25/100)+'</td></tr></table>');
Here is a proposed javascript.lang to fix these problems. It does the
following:
* first check if the input matches a comment
* next check if it matches a division operator, which can occur only
after a number, an identifier, or certain symbols
* finally check if it matches a regular expression
Note that it is no longer based on the java.lang because the order of
the definitions is important. (Hence, this would not work with
source-highlight 2.10, where the matching algorithm was different, but
does work with source-highlight 2.11.)
The disadvantages:
* it no longer reuses java.lang
* the division operator definitions are ugly
The advantages:
* it works in all possible cases (I hope)
* it simplifies the regexp definition
What do you think?
include "c_comment.lang"
keyword =
"abstract|break|case|catch|class|const|continue|debugger|default|delete|do|else|enum|export|extends|false|final|finally|for|function|goto|if|implements|in|instanceof|interface|native|new|null|private|protected|prototype|public|return|static|super|switch|synchronized|throw|throws|this|transient|true|try|typeof|var|volatile|while|with"
(symbol,normal,symbol) = `(\+\+|--|\)|\])(\s*)(/=?(?![*/]))`
(number,normal,symbol) =
`(0x[[:xdigit:]]+|(?:[[:digit:]]*\.)?[[:digit:]]+(?:[eE][+-]?[[:digit:]]+)?)(\s*)(/(?![*/]))`
(normal,symbol) = `([[:alpha:]$_][[:alnum:]$_]*\s*)(/=?(?![*/]))`
regexp = '/(\\.|[^*\\/])(\\.|[^\\/])*/[gim]*'
include "number.lang"
include "c_string.lang"
include "symbols.lang"
cbracket = "{|}"
include "function.lang"
Actually it works also this way, and it reuses most of java.lang (see
the attached file);
what do you think?
cheers
Lorenzo
--
Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
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http://www.gnu.org/software/src-highlite
http://www.gnu.org/software/gengetopt
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# Javascript lang definition file
# first check if the input matches a comment
include "c_comment.lang"
# next check if it matches a division operator, which can occur only
# after a number, an identifier, or certain symbols
(symbol,normal,symbol) =
`(\+\+|--|\)|\])(\s*)(/=?(?![*/]))`
(number,normal,symbol) =
`(0x[[:xdigit:]]+|(?:[[:digit:]]*\.)?[[:digit:]]+(?:[eE][+-]?[[:digit:]]+)?)(\s*)(/(?![*/]))`
(normal,symbol) =
`([[:alpha:]$_][[:alnum:]$_]*\s*)(/=?(?![*/]))`
# finally check if it matches a regular expression
regexp = '/(\\.|[^*\\/])(\\.|[^\\/])*/[gim]*'
include "java.lang"
subst keyword =
"abstract|break|case|catch|class|const|continue|debugger|default|delete|do|else|enum|export|extends|false|final|finally|for|function|goto|if|implements|in|instanceof|interface|native|new|null|private|protected|prototype|public|return|static|super|switch|synchronized|throw|throws|this|transient|true|try|typeof|var|volatile|while|with"
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