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Additional utilities for stringifying and escaping strings

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Needed for JavaScript compilation
This commit is contained in:
Jeremy Ruston 2012-01-03 11:09:26 +00:00
parent 2b5676e187
commit 0de633d28b
1 changed files with 46 additions and 1 deletions
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47
js/Utils.js
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@ -156,7 +156,11 @@ utils.getHours12 = function(date) {
// Convert & to "&amp;", < to "&lt;", > to "&gt;" and " to "&quot;"
utils.htmlEncode = function(s)
{
return s.toString().replace(/&/mg,"&amp;").replace(/</mg,"&lt;").replace(/>/mg,"&gt;").replace(/\"/mg,"&quot;");
if(s) {
return s.toString().replace(/&/mg,"&amp;").replace(/</mg,"&lt;").replace(/>/mg,"&gt;").replace(/\"/mg,"&quot;");
} else {
return "";
}
};
// Convert "&amp;" to &, "&lt;" to <, "&gt;" to > and "&quot;" to "
@ -190,4 +194,45 @@ utils.unescapeLineBreaks = function(s) {
return s.replace(/\\n/mg,"\n").replace(/\\b/mg," ").replace(/\\s/mg,"\\").replace(/\r/mg,"");
};
/*
* Returns an escape sequence for given character. Uses \x for characters <=
* 0xFF to save space, \u for the rest.
*
* The code needs to be in sync with th code template in the compilation
* function for "action" nodes.
*/
// Copied from peg.js, thanks to David Majda
utils.escape = function(ch) {
var escapeChar,
length,
charCode = ch.charCodeAt(0);
if (charCode <= 0xFF) {
escapeChar = 'x';
length = 2;
} else {
escapeChar = 'u';
length = 4;
}
return '\\' + escapeChar + utils.zeroPad(charCode.toString(16).toUpperCase(),length);
};
// Turns a string into a legal JavaScript string
// Copied from peg.js, thanks to David Majda
utils.stringify = function(s) {
/*
* ECMA-262, 5th ed., 7.8.4: All characters may appear literally in a string
* literal except for the closing quote character, backslash, carriage return,
* line separator, paragraph separator, and line feed. Any character may
* appear in the form of an escape sequence.
*
* For portability, we also escape escape all non-ASCII characters.
*/
return '"' + s
.replace(/\\/g, '\\\\') // backslash
.replace(/"/g, '\\"') // closing quote character
.replace(/\r/g, '\\r') // carriage return
.replace(/\n/g, '\\n') // line feed
.replace(/[\x80-\uFFFF]/g, utils.escape) + '"'; // non-ASCII characters
};
})();