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1× | "use strict";
var hl = require("highland");
var R = require("ramda");
var hydrateString = R.curry((db, local, string) => {
const splits = R.flatten(splitStringByRef(string)
.map(createReferenceObject(local, 0)));
const refs = splits.filter(R.is(Object));
if (R.isEmpty(local)) {
local.globalDefault = refs[0].def;
}
if (refs.length === 0) return hl([splits.join("")]);
return db.getMultiple(refs.map(R.prop("key")))
.flatMap(values => {
return values.map((val, i) => {
const obj = refs[i];
if (R.isNil(val)) {
return db.listKey(obj.key, obj.before, obj.after, obj.limit)
.consume((err, list, push) => {
if (err) {
Eif (err.code === 'WRONGTYPE') push(null, R.assoc("value", obj.key, obj));
else push(err);
}
else if (R.isEmpty(list)) {
if (!R.isNil(obj.def)) push(null, R.assoc("value", obj.def, obj));
else if (!R.isNil(local.globalDefault)) {
push({
"type": "DefaultAsKeyNotFound",
"message": local.globalDefault
});
}
else {
push({
"type": "KeyNotFound",
"message": obj.key + ' not available'
});
}
}
else push(null, R.assoc("value", '[' + list.toString() + ']', obj));
push(null, hl.nil);
});
} else {
return hl([R.assoc("value", val, obj)]);
}
});
})
.sequence()
.map(hydrateProps)
.map(obj => {
const value = R.is(String, obj.value) ? obj.value : JSON.stringify(obj.value);
if (obj.key === value) return "${" + value + "}";
local[obj.key] = value;
return value;
})
.reduce(splits, populateArrayWithValues)
.flatMap(function (x) {
return hydrateString(db, local, x.join(""));
})
.consume((err, hydratedString, push) => {
if(err && err.type === "DefaultAsKeyNotFound") push(null, err.message);
else if(err) push(err);
else push(null, hydratedString);
});
});
// if the reference contained "props" (i.e. ${ref,prop1,prop2} fill these values
function hydrateProps(obj) {
if (obj.props.length) {
const getJsonValue = x => R.path(obj.props, JSON.parse(x));
var value = R.tryCatch(getJsonValue, R.always(obj.value))(obj.value);
if(R.isNil(value)) {
throw {
"type": "KeyPropNotFound",
"message": [obj.key].concat(obj.props).reverse().join(' of ') + ' not available'
};
}
else {
const retValue = R.is(String, value) ? escapeSpecialChars(value) : value;
return R.assoc("value", retValue, obj);
}
}
else {
return obj;
}
}
// stitch back the string array, replacing the references with the hydrated values
function populateArrayWithValues(acc, x) {
const index = R.findIndex(R.is(Object))(acc);
acc[index] = x;
return acc;
}
// for each reference, replaces it with an object that can be used in the refs array
const createReferenceObject = R.curry((local, i, x) => {
if (R.test(/\$\{/, x)) {
return R.pipe(removeRefTag, sanitizeKey, checkLocalStorage(local, i))(x);
}
return x;
});
// check that the value hasn't already been used in the hydration process
const checkLocalStorage = R.curry((local, i, obj) => {
if (i > 25) {
throw {
"type": "CycleDetected",
"message": "Cycle Detected in " + obj.key
};
}
else if (R.has(obj.key, local)) {
// recursive function
return splitStringByRef(local[obj.key])
.map(createReferenceObject(local, i + 1));
}
else {
return obj;
}
});
// splits a string into a array that splits references from the string.
// The list remains in order. i.e: string === splitStringByRef(string).join("");
function splitStringByRef(string) {
const newStringReplaced = string.split(/(?=[$])/)
.map(inner => {
if (inner.charAt(0) === "$" && inner.charAt(1) === "{") {
const parentheseAt = inner.indexOf('}') + 1;
return R.pair(inner.substr(0, parentheseAt), inner.substr(parentheseAt));
}
return inner;
});
return R.flatten(newStringReplaced);
}
function sanitizeKey(input) {
const $temp = input.split(';');
const xs = $temp[0].split(',');
var key = R.head(xs); // the db key to get the value from
var before = NaN;
var after = NaN;
var limit = Infinity;
const beforeAfterMatch = key.match(/\[(-?\d*)\|(-?\d*)\]/);
if (beforeAfterMatch) {
key = key.replace(beforeAfterMatch[0], '');
after = parseInt(beforeAfterMatch[1]);
before = parseInt(beforeAfterMatch[2]);
}
const limitMatch = key.match(/\^(\d+)/);
if (limitMatch) {
key = key.replace(limitMatch[0], '');
limit = parseInt(limitMatch[1]);
}
if (Number.isNaN(before) || R.isNil(before)) before = Infinity;
if (Number.isNaN(after) || R.isNil(before)) after = -Infinity;
return {
"key": key,
"def": $temp[1],
"props": R.tail(xs),
"after": after,
"before": before,
"limit": limit
};
}
function removeRefTag(input) {
const m = input.match(/\${(.*?)}/);
return m ? m[1] : input;
}
function escapeSpecialChars(str) {
return str
.replace(/\n/g, "\\\\n")
.replace(/\r/g, "\\\\r")
.replace(/\t/g, "\\\\t")
.replace(/\f/g, "\\\\f");
}
module.exports = hydrateString; |