web/data/cubicweb.python.js
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Mon, 15 Feb 2010 17:47:50 +0100
branchstable
changeset 4585 912aba7e6400
parent 3142 5c07c3b2b332
child 4830 10e8bc190695
permissions -rw-r--r--
[inlined formos] don't pop attributes from kwargs, so they end-up in cw_extra_kwargs which is then passed to the edition form
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/*
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 * This file contains extensions for standard javascript types
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 *
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 */
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ONE_DAY = 86400000; // (in milliseconds)
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// ========== DATE EXTENSIONS ========== ///
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Date.prototype.equals = function(other) {
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    /* compare with other date ignoring time differences */
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    if (this.getYear() == other.getYear() &&
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	this.getMonth() == other.getMonth() &&
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	this.getDate() == other.getDate()) {
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	return true;
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    }
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    return false;
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};
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Date.prototype.add = function(days) {
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    var res = new Date();
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    res.setTime(this.getTime() + (days * ONE_DAY));
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    return res;
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};
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Date.prototype.sub = function(days) {
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    return this.add(-days);
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};
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Date.prototype.iadd = function(days) {
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    // in-place add
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    this.setTime(this.getTime() + (days * ONE_DAY));
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    // avoid strange rounding problems !!
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    this.setHours(12);
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};
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Date.prototype.isub = function(days) {
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    // in-place sub
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    this.setTime(this.getTime() - (days * ONE_DAY));
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};
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/*
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 * returns the first day of the next month
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 */
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Date.prototype.nextMonth = function() {
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    if (this.getMonth() == 11) {
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	var d =new Date(this.getFullYear()+1, 0, 1);
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	return d;
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    } else {
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	var d2 = new Date(this.getFullYear(), this.getMonth()+1, 1);
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	return d2;
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    }
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};
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/*
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 * returns the day of week, 0 being monday, 6 being sunday
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 */
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Date.prototype.getRealDay = function() {
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    // getDay() returns 0 for Sunday ==> 6 for Saturday
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    return (this.getDay()+6) % 7;
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};
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Date.prototype.strftime = function(fmt) {
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    if (this.toLocaleFormat !== undefined) { // browser dependent
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	return this.toLocaleFormat(fmt);
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    }
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    // XXX implement at least a decent fallback implementation
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    return this.getFullYear() + '/' + (this.getMonth()+1) + '/' + this.getDate();
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};
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var _DATE_FORMAT_REGXES = {
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    'Y': new RegExp('^-?[0-9]+'),
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    'd': new RegExp('^[0-9]{1,2}'),
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    'm': new RegExp('^[0-9]{1,2}'),
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    'H': new RegExp('^[0-9]{1,2}'),
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    'M': new RegExp('^[0-9]{1,2}')
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}
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/*
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 * _parseData does the actual parsing job needed by `strptime`
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 */
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function _parseDate(datestring, format) {
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    var skip0 = new RegExp('^0*[0-9]+');
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    var parsed = {};
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    for (var i1=0,i2=0;i1<format.length;i1++,i2++) {
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	var c1 = format.charAt(i1);
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	var c2 = datestring.charAt(i2);
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	if (c1 == '%') {
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	    c1 = format.charAt(++i1);
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	    var data = _DATE_FORMAT_REGXES[c1].exec(datestring.substring(i2));
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	    if (!data.length) {
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		return null;
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	    }
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	    data = data[0];
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	    i2 += data.length-1;
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	    var value = parseInt(data, 10);
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	    if (isNaN(value)) {
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		return null;
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	    }
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	    parsed[c1] = value;
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	    continue;
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	}
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	if (c1 != c2) {
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	    return null;
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	}
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    }
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    return parsed;
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}
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/*
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 * basic implementation of strptime. The only recognized formats
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 * defined in _DATE_FORMAT_REGEXES (i.e. %Y, %d, %m, %H, %M)
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 */
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function strptime(datestring, format) {
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    var parsed = _parseDate(datestring, format);
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    if (!parsed) {
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	return null;
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    }
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    // create initial date (!!! year=0 means 1900 !!!)
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    var date = new Date(0, 0, 1, 0, 0);
0
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    date.setFullYear(0); // reset to year 0
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    if (parsed.Y) {
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	date.setFullYear(parsed.Y);
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    }
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    if (parsed.m) {
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	if (parsed.m < 1 || parsed.m > 12) {
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	    return null;
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	}
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	// !!! month indexes start at 0 in javascript !!!
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	date.setMonth(parsed.m - 1);
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    }
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    if (parsed.d) {
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	if (parsed.m < 1 || parsed.m > 31) {
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	    return null;
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	}
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	date.setDate(parsed.d);
0
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    }
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    if (parsed.H) {
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	if (parsed.H < 0 || parsed.H > 23) {
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	    return null;
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	}
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	date.setHours(parsed.H);
0
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    }
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    if (parsed.M) {
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	if (parsed.M < 0 || parsed.M > 59) {
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	    return null;
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	}
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	date.setMinutes(parsed.M);
0
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    }
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    return date;
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}
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// ========== END OF DATE EXTENSIONS ========== ///
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// ========== ARRAY EXTENSIONS ========== ///
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Array.prototype.contains = function(element) {
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    return findValue(this, element) != -1;
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};
0
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// ========== END OF ARRAY EXTENSIONS ========== ///
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// ========== STRING EXTENSIONS ========== //
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/* python-like startsWith method for js strings
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 * >>>
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 */
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String.prototype.startsWith = function(prefix) {
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    return this.indexOf(prefix) == 0;
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};
0
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/* python-like endsWith method for js strings */
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String.prototype.endsWith = function(suffix) {
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    var startPos = this.length - suffix.length;
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    if (startPos < 0) { return false; }
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    return this.lastIndexOf(suffix, startPos) == startPos;
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};
0
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/* python-like strip method for js strings */
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String.prototype.strip = function() {
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    return this.replace(/^\s*(.*?)\s*$/, "$1");
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};
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/* py-equiv: string in list */
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String.prototype.in_ = function(values) {
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    return findValue(values, this) != -1;
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};
0
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/* py-equiv: str.join(list) */
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String.prototype.join = function(args) {
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    return args.join(this);
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};
0
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/* python-like list builtin
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 * transforms an iterable in a js sequence
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 * >>> gen = ifilter(function(x) {return x%2==0}, range(10))
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 * >>> s = list(gen)
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 * [0,2,4,6,8]
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 */
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function list(iterable) {
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    var iterator = iter(iterable);
0
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    var result = [];
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    while (true) {
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	/* iterates until StopIteration occurs */
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	try {
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	    result.push(iterator.next());
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	} catch (exc) {
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	    if (exc != StopIteration) { throw exc; }
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	    return result;
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	}
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    }
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}
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/* py-equiv: getattr(obj, attrname, default=None) */
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function getattr(obj, attrname, defaultValue) {
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    // when not passed, defaultValue === undefined
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    return obj[attrname] || defaultValue;
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}
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/* py-equiv: operator.attrgetter */
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function attrgetter(attrname) {
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    return function(obj) { return getattr(obj, attrname); };
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}
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/* returns a subslice of `lst` using `start`/`stop`/`step`
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 * start, stop might be negative
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 *
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 * >>> sliceList(['a', 'b', 'c', 'd', 'e', 'f'], 2)
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 * ['c', 'd', 'e', 'f']
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 * >>> sliceList(['a', 'b', 'c', 'd', 'e', 'f'], 2, -2)
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 * ['c', 'd']
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 * >>> sliceList(['a', 'b', 'c', 'd', 'e', 'f'], -3)
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 * ['d', 'e', 'f']
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 */
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function sliceList(lst, start, stop, step) {
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    var start = start || 0;
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    var stop = stop || lst.length;
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    var step = step || 1;
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    if (stop < 0) {
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	stop = max(lst.length+stop, 0);
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    }
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    if (start < 0) {
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	start = min(lst.length+start, lst.length);
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    }
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    var result = [];
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    for (var i=start; i < stop; i+=step) {
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	result.push(lst[i]);
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    }
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    return result;
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}
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/* returns a partial func that calls a mehod on its argument
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 * py-equiv: return lambda obj: getattr(obj, methname)(*args)
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 */
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function methodcaller(methname) {
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    var args = sliceList(arguments, 1);
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    return function(obj) {
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	return obj[methname].apply(obj, args);
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    };
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}
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/* use MochiKit's listMin / listMax */
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function min() { return listMin(arguments); }
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function max() { return listMax(arguments); }
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/*
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 * >>> d = dict(["x", "y", "z"], [0, 1, 2])
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 * >>> d['y']
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 * 1
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 * >>> d.y
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 * 1
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 */
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function dict(keys, values) {
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    if (keys.length != values.length) {
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	throw "got different number of keys and values !";
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    }
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    var newobj = {};
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    for(var i=0; i<keys.length; i++) {
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	newobj[keys[i]] = values[i];
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    }
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    return newobj;
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}
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function concat() {
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    return ''.join(list(arguments));
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}
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/**** class factories ****/
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// transforms a function into an unbound method
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function makeUnboundMethod(meth) {
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    function unboundMeth(self) {
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	var newargs = sliceList(arguments, 1);
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	return meth.apply(self, newargs);
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    }
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    unboundMeth.__name__ = meth.__name__;
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    return unboundMeth;
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}
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function attachMethodToClass(cls, methname, meth) {
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    meth.__name__ = methname;
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    // XXX : this is probably bad for memory usage
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    cls.__dict__[methname] = meth;
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    cls[methname] = makeUnboundMethod(meth); // for the class itself
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    cls.prototype[methname] = meth; // for the instance
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}
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// simple internal function that tells if the attribute should
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// be copied from baseclasses or not
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function _isAttrSkipped(attrname) {
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    var skipped = ['__class__', '__dict__', '__bases__', 'prototype'];
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    for (var i=0; i < skipped.length; i++) {
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	if (skipped[i] == attrname) {
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	    return true;
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	}
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    }
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    return false;
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}
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// internal function used to build the class constructor
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function makeConstructor(userctor) {
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    return function() {
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	// this is a proxy to user's __init__
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	if (userctor) {
0
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	    userctor.apply(this, arguments);
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	}
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    };
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}
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/* this is a js class factory. objects returned by this function behave
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 * more or less like a python class. The `class` function prototype is
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 * inspired by the python `type` builtin
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 * Important notes :
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 *  -> methods are _STATICALLY_ attached when the class it created
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 *  -> multiple inheritance was never tested, which means it doesn't work ;-)
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 */
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function defclass(name, bases, classdict) {
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    var baseclasses = bases || [];
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    // this is the static inheritance approach (<=> differs from python)
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    var basemeths = {};
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    var reverseLookup = [];
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    for(var i=baseclasses.length-1; i >= 0; i--) {
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	reverseLookup.push(baseclasses[i]);
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    }
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    reverseLookup.push({'__dict__' : classdict});
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    for(var i=0; i < reverseLookup.length; i++) {
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	var cls = reverseLookup[i];
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	for (prop in cls.__dict__) {
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	    // XXX hack to avoid __init__, __bases__...
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	    if ( !_isAttrSkipped(prop) ) {
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		basemeths[prop] = cls.__dict__[prop];
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	    }
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	}
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    }
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    var userctor = basemeths['__init__'];
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    var constructor = makeConstructor(userctor);
0
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    // python-like interface
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    constructor.__name__ = name;
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    constructor.__bases__ = baseclasses;
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    constructor.__dict__ = {};
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    constructor.prototype.__class__ = constructor;
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    // make bound / unbound methods
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    for (methname in basemeths) {
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	attachMethodToClass(constructor, methname, basemeths[methname]);
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    }
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    return constructor;
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}
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// Not really python-like
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CubicWeb = {};
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// XXX backward compatibility
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Erudi = CubicWeb;
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CubicWeb.loaded = [];
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CubicWeb.require = function(module) {
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    if (!CubicWeb.loaded.contains(module)) {
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	// a CubicWeb.load_javascript(module) function would require a dependency on ajax.js
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	log(module, ' is required but not loaded');
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    }
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};
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CubicWeb.provide = function(module) {
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    if (!CubicWeb.loaded.contains(module)) {
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	CubicWeb.loaded.push(module);
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    }
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};
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CubicWeb.provide('python.js');