264 lines
8.4 KiB
Python
264 lines
8.4 KiB
Python
# -*- coding: utf-8 -*-
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"""
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werkzeug.contrib.jsrouting
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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Addon module that allows to create a JavaScript function from a map
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that generates rules.
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:copyright: (c) 2014 by the Werkzeug Team, see AUTHORS for more details.
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:license: BSD, see LICENSE for more details.
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"""
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try:
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from simplejson import dumps
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except ImportError:
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try:
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from json import dumps
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except ImportError:
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def dumps(*args):
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raise RuntimeError('simplejson required for jsrouting')
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from inspect import getmro
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from werkzeug.routing import NumberConverter
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from werkzeug._compat import iteritems
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def render_template(name_parts, rules, converters):
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result = u''
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if name_parts:
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for idx in range(0, len(name_parts) - 1):
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name = u'.'.join(name_parts[:idx + 1])
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result += u"if (typeof %s === 'undefined') %s = {}\n" % (name, name)
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result += '%s = ' % '.'.join(name_parts)
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result += """(function (server_name, script_name, subdomain, url_scheme) {
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var converters = [%(converters)s];
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var rules = %(rules)s;
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function in_array(array, value) {
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if (array.indexOf != undefined) {
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return array.indexOf(value) != -1;
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}
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for (var i = 0; i < array.length; i++) {
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if (array[i] == value) {
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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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function array_diff(array1, array2) {
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array1 = array1.slice();
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for (var i = array1.length-1; i >= 0; i--) {
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if (in_array(array2, array1[i])) {
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array1.splice(i, 1);
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}
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}
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return array1;
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}
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function split_obj(obj) {
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var names = [];
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var values = [];
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for (var name in obj) {
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if (typeof(obj[name]) != 'function') {
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names.push(name);
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values.push(obj[name]);
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}
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}
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return {names: names, values: values, original: obj};
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}
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function suitable(rule, args) {
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var default_args = split_obj(rule.defaults || {});
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var diff_arg_names = array_diff(rule.arguments, default_args.names);
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for (var i = 0; i < diff_arg_names.length; i++) {
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if (!in_array(args.names, diff_arg_names[i])) {
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return false;
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}
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}
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if (array_diff(rule.arguments, args.names).length == 0) {
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if (rule.defaults == null) {
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return true;
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}
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for (var i = 0; i < default_args.names.length; i++) {
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var key = default_args.names[i];
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var value = default_args.values[i];
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if (value != args.original[key]) {
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return false;
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}
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}
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}
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return true;
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}
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function build(rule, args) {
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var tmp = [];
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var processed = rule.arguments.slice();
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for (var i = 0; i < rule.trace.length; i++) {
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var part = rule.trace[i];
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if (part.is_dynamic) {
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var converter = converters[rule.converters[part.data]];
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var data = converter(args.original[part.data]);
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if (data == null) {
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return null;
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}
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tmp.push(data);
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processed.push(part.name);
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} else {
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tmp.push(part.data);
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}
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}
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tmp = tmp.join('');
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var pipe = tmp.indexOf('|');
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var subdomain = tmp.substring(0, pipe);
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var url = tmp.substring(pipe+1);
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var unprocessed = array_diff(args.names, processed);
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var first_query_var = true;
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for (var i = 0; i < unprocessed.length; i++) {
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if (first_query_var) {
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url += '?';
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} else {
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url += '&';
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}
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first_query_var = false;
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url += encodeURIComponent(unprocessed[i]);
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url += '=';
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url += encodeURIComponent(args.original[unprocessed[i]]);
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}
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return {subdomain: subdomain, path: url};
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}
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function lstrip(s, c) {
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while (s && s.substring(0, 1) == c) {
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s = s.substring(1);
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}
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return s;
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}
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function rstrip(s, c) {
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while (s && s.substring(s.length-1, s.length) == c) {
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s = s.substring(0, s.length-1);
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}
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return s;
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}
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return function(endpoint, args, force_external) {
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args = split_obj(args);
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var rv = null;
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for (var i = 0; i < rules.length; i++) {
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var rule = rules[i];
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if (rule.endpoint != endpoint) continue;
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if (suitable(rule, args)) {
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rv = build(rule, args);
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if (rv != null) {
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break;
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}
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}
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}
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if (rv == null) {
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return null;
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}
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if (!force_external && rv.subdomain == subdomain) {
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return rstrip(script_name, '/') + '/' + lstrip(rv.path, '/');
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} else {
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return url_scheme + '://'
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+ (rv.subdomain ? rv.subdomain + '.' : '')
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+ server_name + rstrip(script_name, '/')
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+ '/' + lstrip(rv.path, '/');
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}
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};
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})""" % {'converters': u', '.join(converters),
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'rules': rules}
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return result
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def generate_map(map, name='url_map'):
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"""
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Generates a JavaScript function containing the rules defined in
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this map, to be used with a MapAdapter's generate_javascript
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method. If you don't pass a name the returned JavaScript code is
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an expression that returns a function. Otherwise it's a standalone
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script that assigns the function with that name. Dotted names are
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resolved (so you an use a name like 'obj.url_for')
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In order to use JavaScript generation, simplejson must be installed.
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Note that using this feature will expose the rules
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defined in your map to users. If your rules contain sensitive
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information, don't use JavaScript generation!
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"""
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from warnings import warn
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warn(DeprecationWarning('This module is deprecated'))
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map.update()
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rules = []
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converters = []
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for rule in map.iter_rules():
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trace = [{
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'is_dynamic': is_dynamic,
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'data': data
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} for is_dynamic, data in rule._trace]
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rule_converters = {}
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for key, converter in iteritems(rule._converters):
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js_func = js_to_url_function(converter)
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try:
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index = converters.index(js_func)
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except ValueError:
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converters.append(js_func)
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index = len(converters) - 1
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rule_converters[key] = index
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rules.append({
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u'endpoint': rule.endpoint,
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u'arguments': list(rule.arguments),
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u'converters': rule_converters,
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u'trace': trace,
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u'defaults': rule.defaults
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})
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return render_template(name_parts=name and name.split('.') or [],
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rules=dumps(rules),
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converters=converters)
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def generate_adapter(adapter, name='url_for', map_name='url_map'):
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"""Generates the url building function for a map."""
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values = {
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u'server_name': dumps(adapter.server_name),
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u'script_name': dumps(adapter.script_name),
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u'subdomain': dumps(adapter.subdomain),
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u'url_scheme': dumps(adapter.url_scheme),
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u'name': name,
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u'map_name': map_name
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}
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return u'''\
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var %(name)s = %(map_name)s(
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%(server_name)s,
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%(script_name)s,
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%(subdomain)s,
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%(url_scheme)s
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);''' % values
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def js_to_url_function(converter):
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"""Get the JavaScript converter function from a rule."""
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if hasattr(converter, 'js_to_url_function'):
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data = converter.js_to_url_function()
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else:
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for cls in getmro(type(converter)):
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if cls in js_to_url_functions:
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data = js_to_url_functions[cls](converter)
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break
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else:
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return 'encodeURIComponent'
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return '(function(value) { %s })' % data
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def NumberConverter_js_to_url(conv):
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if conv.fixed_digits:
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return u'''\
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var result = value.toString();
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while (result.length < %s)
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result = '0' + result;
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return result;''' % conv.fixed_digits
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return u'return value.toString();'
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js_to_url_functions = {
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NumberConverter: NumberConverter_js_to_url
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}
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