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Diffstat (limited to '')
-rw-r--r-- | sandbox/sebastien/cpp/apr-2/modules/js/htdocs/util.js | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/sandbox/sebastien/cpp/apr-2/modules/js/htdocs/util.js b/sandbox/sebastien/cpp/apr-2/modules/js/htdocs/util.js new file mode 100644 index 0000000000..0f966b180e --- /dev/null +++ b/sandbox/sebastien/cpp/apr-2/modules/js/htdocs/util.js @@ -0,0 +1,208 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +/** + * Simple utility functions. + */ + +/** + * Scheme-like lists. + */ +function cons(car, cdr) { + return new Array(car).concat(cdr); +} + +function car(l) { + return l[0]; +} + +function first(l) { + return car(l); +} + +function cdr(l) { + return l.slice(1); +} + +function rest(l) { + return cdr(l); +} + +function cadr(l) { + return car(cdr(l)); +} + +function cddr(l) { + return cdr(cdr(l)); +} + +function caddr(l) { + return car(cddr(l)); +} + +function append(a, b) { + return a.concat(b); +} + +function reverse(l) { + return l.slice(0).reverse(); +} + +function isNil(v) { + if (v == null) + return true; + if ('' + v == 'undefined') + return true; + try { + if (isList(v) && v.length == 0) + return true; + } catch (e) {} + return false; +} + +function isSymbol(v) { + if (typeof v == 'string' && v.slice(0, 1) == "'") + return true; + return false; +} + +function isString(v) { + if (typeof v == 'string') + return true; + return false; +} + +function isList(v) { + try { + if (v.constructor == Array) + return true; + } catch (e) {} + return false; +} + +function isTaggedList(v, t) { + if (isList(v) && !isNil(v) && car(v) == t) + return true; + return false; +} + +function mklist() { + var a = new Array(); + for (i = 0; i < arguments.length; i++) + a[i] = arguments[i]; + return a; +} + +function length(l) { + return l.length; +} + +/** + * Scheme-like associations. + */ +function assoc(k, l) { + if (isNil(l)) + return mklist(); + if (k == car(car(l))) + return car(l); + return assoc(k, cdr(l)); +} + +/** + * Map and filter functions. + */ +function map(f, l) { + if (isNil(l)) + return l; + return cons(f(car(l)), map(f, cdr(l))); +} + +function filter(f, l) { + if (isNil(l)) + return l; + if (f(car(l))) + return cons(car(l), filter(f, cdr(l))); + return filter(f, cdr(l)); +} + +/** + * Split a path into a list of segments. + */ +function tokens(path) { + return filter(function(s) { return length(s) != 0; }, path.split("/")); +} + +/** + * Log a value. + */ +function log(v) { + try { + console.log(v); + } catch (e) {} + return true; +} + +/** + * Dump an object to the debug console. + */ +function debug(o) { + try { + for (f in o) { + try { + console.log(f + '=' + o[f]); + } catch (e) {} + } + } catch (e) {} + return true; +} + +/** + * Write a list of strings. + */ +function writeStrings(l) { + if (isNil(l)) + return ''; + return car(l) + writeStrings(cdr(l)); +} + +/** + * Write a value using a Scheme-like syntax. + */ +function writeValue(v) { + function writePrimitive(p) { + if (isSymbol(p)) + return '' + p.substring(1); + if (isString(p)) + return '"' + p + '"'; + return '' + p; + } + + function writeList(l) { + if (isNil(l)) + return ''; + return ' ' + writeValue(car(l)) + writeList(cdr(l)); + } + + if (!isList(v)) + return writePrimitive(v); + if (isNil(v)) + return '()'; + return '(' + writeValue(car(v)) + writeList(cdr(v)) + ')'; +} + |