261 lines
7.4 KiB
JavaScript
261 lines
7.4 KiB
JavaScript
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var aesprim = require('./aesprim');
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var slice = require('./slice');
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var _evaluate = require('static-eval');
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var _uniq = require('underscore').uniq;
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var Handlers = function() {
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return this.initialize.apply(this, arguments);
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}
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Handlers.prototype.initialize = function() {
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this.traverse = traverser(true);
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this.descend = traverser();
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}
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Handlers.prototype.keys = Object.keys;
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Handlers.prototype.resolve = function(component) {
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var key = [ component.operation, component.scope, component.expression.type ].join('-');
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var method = this._fns[key];
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if (!method) throw new Error("couldn't resolve key: " + key);
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return method.bind(this);
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};
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Handlers.prototype.register = function(key, handler) {
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if (!handler instanceof Function) {
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throw new Error("handler must be a function");
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}
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this._fns[key] = handler;
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};
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Handlers.prototype._fns = {
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'member-child-identifier': function(component, partial) {
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var key = component.expression.value;
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var value = partial.value;
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if (value instanceof Object && key in value) {
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return [ { value: value[key], path: partial.path.concat(key) } ]
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}
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},
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'member-descendant-identifier':
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_traverse(function(key, value, ref) { return key == ref }),
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'subscript-child-numeric_literal':
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_descend(function(key, value, ref) { return key === ref }),
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'member-child-numeric_literal':
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_descend(function(key, value, ref) { return String(key) === String(ref) }),
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'subscript-descendant-numeric_literal':
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_traverse(function(key, value, ref) { return key === ref }),
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'member-child-wildcard':
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_descend(function() { return true }),
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'member-descendant-wildcard':
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_traverse(function() { return true }),
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'subscript-descendant-wildcard':
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_traverse(function() { return true }),
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'subscript-child-wildcard':
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_descend(function() { return true }),
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'subscript-child-slice': function(component, partial) {
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if (is_array(partial.value)) {
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var args = component.expression.value.split(':').map(_parse_nullable_int);
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var values = partial.value.map(function(v, i) { return { value: v, path: partial.path.concat(i) } });
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return slice.apply(null, [values].concat(args));
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}
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},
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'subscript-child-union': function(component, partial) {
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var results = [];
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component.expression.value.forEach(function(component) {
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var _component = { operation: 'subscript', scope: 'child', expression: component.expression };
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var handler = this.resolve(_component);
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var _results = handler(_component, partial);
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if (_results) {
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results = results.concat(_results);
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}
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}, this);
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return unique(results);
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},
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'subscript-descendant-union': function(component, partial, count) {
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var jp = require('..');
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var self = this;
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var results = [];
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var nodes = jp.nodes(partial, '$..*').slice(1);
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nodes.forEach(function(node) {
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if (results.length >= count) return;
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component.expression.value.forEach(function(component) {
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var _component = { operation: 'subscript', scope: 'child', expression: component.expression };
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var handler = self.resolve(_component);
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var _results = handler(_component, node);
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results = results.concat(_results);
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});
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});
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return unique(results);
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},
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'subscript-child-filter_expression': function(component, partial, count) {
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// slice out the expression from ?(expression)
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var src = component.expression.value.slice(2, -1);
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var ast = aesprim.parse(src).body[0].expression;
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var passable = function(key, value) {
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return evaluate(ast, { '@': value });
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}
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return this.descend(partial, null, passable, count);
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},
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'subscript-descendant-filter_expression': function(component, partial, count) {
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// slice out the expression from ?(expression)
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var src = component.expression.value.slice(2, -1);
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var ast = aesprim.parse(src).body[0].expression;
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var passable = function(key, value) {
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return evaluate(ast, { '@': value });
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}
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return this.traverse(partial, null, passable, count);
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},
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'subscript-child-script_expression': function(component, partial) {
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var exp = component.expression.value.slice(1, -1);
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return eval_recurse(partial, exp, '$[{{value}}]');
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},
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'member-child-script_expression': function(component, partial) {
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var exp = component.expression.value.slice(1, -1);
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return eval_recurse(partial, exp, '$.{{value}}');
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},
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'member-descendant-script_expression': function(component, partial) {
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var exp = component.expression.value.slice(1, -1);
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return eval_recurse(partial, exp, '$..value');
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}
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};
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Handlers.prototype._fns['subscript-child-string_literal'] =
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Handlers.prototype._fns['member-child-identifier'];
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Handlers.prototype._fns['member-descendant-numeric_literal'] =
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Handlers.prototype._fns['subscript-descendant-string_literal'] =
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Handlers.prototype._fns['member-descendant-identifier'];
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function eval_recurse(partial, src, template) {
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var jp = require('./index');
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var ast = aesprim.parse(src).body[0].expression;
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var value = evaluate(ast, { '@': partial.value });
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var path = template.replace(/\{\{\s*value\s*\}\}/g, value);
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var results = jp.nodes(partial.value, path);
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results.forEach(function(r) {
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r.path = partial.path.concat(r.path.slice(1));
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});
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return results;
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}
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function is_array(val) {
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return Array.isArray(val);
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}
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function is_object(val) {
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// is this a non-array, non-null object?
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return val && !(val instanceof Array) && val instanceof Object;
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}
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function traverser(recurse) {
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return function(partial, ref, passable, count) {
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var value = partial.value;
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var path = partial.path;
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var results = [];
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var descend = function(value, path) {
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if (is_array(value)) {
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value.forEach(function(element, index) {
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if (results.length >= count) { return }
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if (passable(index, element, ref)) {
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results.push({ path: path.concat(index), value: element });
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}
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});
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value.forEach(function(element, index) {
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if (results.length >= count) { return }
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if (recurse) {
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descend(element, path.concat(index));
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}
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});
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} else if (is_object(value)) {
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this.keys(value).forEach(function(k) {
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if (results.length >= count) { return }
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if (passable(k, value[k], ref)) {
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results.push({ path: path.concat(k), value: value[k] });
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}
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})
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this.keys(value).forEach(function(k) {
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if (results.length >= count) { return }
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if (recurse) {
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descend(value[k], path.concat(k));
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}
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});
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}
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}.bind(this);
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descend(value, path);
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return results;
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}
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}
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function _descend(passable) {
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return function(component, partial, count) {
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return this.descend(partial, component.expression.value, passable, count);
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}
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}
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function _traverse(passable) {
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return function(component, partial, count) {
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return this.traverse(partial, component.expression.value, passable, count);
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}
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}
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function evaluate() {
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try { return _evaluate.apply(this, arguments) }
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catch (e) { }
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}
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function unique(results) {
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results = results.filter(function(d) { return d })
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return _uniq(
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results,
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function(r) { return r.path.map(function(c) { return String(c).replace('-', '--') }).join('-') }
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);
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}
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function _parse_nullable_int(val) {
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var sval = String(val);
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return sval.match(/^-?[0-9]+$/) ? parseInt(sval) : null;
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}
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module.exports = Handlers;
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