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refactored createRule to support collect / query features #175

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refactored createRule to support collect / query features #175

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209 changes: 138 additions & 71 deletions lib/rule.js
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Original file line number Diff line number Diff line change
Expand Up @@ -130,7 +130,17 @@ var getParamType = function getParamType(type, scope) {

return _getParamType(type);
};
//
function mergePatterns(patterns, merged, setAliases) {
var flattened = extd(patterns).flatten().value();
flattened.forEach(function (thePattern) {
setAliases.push(thePattern.alias);
merged.push([thePattern]);
});
return merged;
}

//
var parsePattern = extd
.switcher()
.containsAt("or", 0, function (condition) {
Expand Down Expand Up @@ -198,16 +208,16 @@ var parsePattern = extd
}
condition = normailizeConstraint(condition);
if (condition[4] && condition[4].from) {
return [
new FromPattern(
getParamType(condition[0], condition.scope),
condition[1] || "m",
parseConstraint(condition[2] || "true"),
condition[3] || {},
parseConstraint(condition[4].from),
{scope: condition.scope, pattern: condition[2]}
)
];
return [
new FromPattern(
getParamType(condition[0], condition.scope),
condition[1] || "m",
parseConstraint(condition[2] || "true"),
condition[3] || {},
parseConstraint(condition[4].from),
{scope: condition.scope, pattern: condition[2]}
)
];
} else {
return [
new ObjectPattern(
Expand All @@ -218,7 +228,7 @@ var parsePattern = extd
{scope: condition.scope, pattern: condition[2]}
)
];
}
}
}).switcher();

var Rule = declare({
Expand All @@ -227,6 +237,7 @@ var Rule = declare({
this.name = name;
this.pattern = pattern;
this.cb = cb;
this.noLoop = options.noLoop;
if (options.agendaGroup) {
this.agendaGroup = options.agendaGroup;
this.autoFocus = extd.isBoolean(options.autoFocus) ? options.autoFocus : false;
Expand All @@ -236,7 +247,7 @@ var Rule = declare({

fire: function (flow, match) {
var ret = new Promise(), cb = this.cb;
try {
try {
if (cb.length === 3) {
cb.call(flow, match.factHash, flow, ret.resolve);
} else {
Expand All @@ -249,67 +260,123 @@ var Rule = declare({
}
}
});
exports.Rule = Rule;

//
function _mergePatterns (patterns) {
//
return function (patt, i) {
// [pattern], [pattern], ... in arrays of length 1
// we wish to build a single array in order of lhs progression
if( isArray(patt) ) {
if( patt.length === 1 ) {
patt = patt[0];
i = 0;
}
else {
throw new Error('invalid pattern structure');
}
}
if (!patterns[i]) {
patterns[i] = i === 0 ? [] : patterns[i - 1].slice();
//remove dup
if (i !== 0) {
patterns[i].pop();
}
patterns[i].push(patt);
} else {
extd(patterns).forEach(function (p) {
p.push(patt);
});
}
};
}
//
//
function createRule(name, options, conditions, cb) {
if (isArray(options)) {
cb = conditions;
conditions = options;
} else {
options = options || {};
}
var isRules = extd.every(conditions, function (cond) {
return isArray(cond);
});
if (isRules && conditions.length === 1) {
conditions = conditions[0];
isRules = false;
}
var rules = [];
var scope = options.scope || {};
conditions.scope = scope;
if (isRules) {
var _mergePatterns = function (patt, i) {
if (!patterns[i]) {
patterns[i] = i === 0 ? [] : patterns[i - 1].slice();
//remove dup
if (i !== 0) {
patterns[i].pop();
}
patterns[i].push(patt);
} else {
extd(patterns).forEach(function (p) {
p.push(patt);
});
}

};
var l = conditions.length, patterns = [], condition;
for (var i = 0; i < l; i++) {
condition = conditions[i];
condition.scope = scope;
extd.forEach(parsePattern(condition), _mergePatterns);

}
rules = extd.map(patterns, function (patterns) {
var compPat = null;
for (var i = 0; i < patterns.length; i++) {
if (compPat === null) {
compPat = new CompositePattern(patterns[i++], patterns[i]);
} else {
compPat = new CompositePattern(compPat, patterns[i]);
}
}
return new Rule(name, options, compPat, cb);
});
} else {
rules = extd.map(parsePattern(conditions), function (cond) {
return new Rule(name, options, cond, cb);
});
}
return rules;
var rules = [], scope, patterns, isComposite;
function processConditions(conditions, scope) {
var l = conditions.length,
merged = [],
fnMerge = _mergePatterns(merged),
isRules = extd.every(conditions, function (cond) {return isArray(cond);}),
condition, rules, patterns;
//
if( isRules && conditions.length === 1 ) {
isRules = false;
conditions = conditions[0];
}
//
function isSinglePattern(patterns) {
var ret = true;
if( patterns.length > 1 ) {
if( isArray(patterns[0]) ) {
ret = false;
}
// else it's OR [ p, p,...] which we treat as a single rule which results in multiple rules
}
return ret;
}
//
function patternFromCondition(condition, scope) {
var patterns;
condition.scope = scope;
patterns = parsePattern(condition);
return patterns;
}
//
function compositePattern(patterns) {

return extd.map(merged, function (patterns) {
var compPat = null;
for (var i = 0; i < patterns.length; i++) {
if (compPat === null) {
compPat = new CompositePattern(patterns[i++], patterns[i]);
} else {
compPat = new CompositePattern(compPat, patterns[i]);
}
}
return new Rule(name, options, compPat, cb);
});
}
//
function singlePattern(pattern) {
return extd.map(patterns, function (cond) {
return new Rule(name, options, cond, cb);
});
}
//
if( isRules ) {
for (var i = 0; i < l; i++) {
condition = conditions[i];
condition.scope = scope;
patterns = patternFromCondition(condition, scope);
extd.forEach( patterns, fnMerge );
}
rules = compositePattern(merged);
}
else {
patterns = patternFromCondition(conditions, scope);
if( isSinglePattern(patterns) ) {
rules = singlePattern(patterns);
}
else {
extd.forEach( patterns, fnMerge );
rules = compositePattern(merged);
}
}
return rules;
}
//
if (isArray(options)) {
cb = conditions;
conditions = options;
options = {};
} else {
options = options || {};
}
scope = options.scope || {};
return processConditions(conditions, scope);
}

exports.createRule = createRule;