'use strict';
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module.exports = function defFunc (ajv) {
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var transform = {
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trimLeft: function (value) {
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return value.replace(/^[\s]+/, '');
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},
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trimRight: function (value) {
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return value.replace(/[\s]+$/, '');
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},
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trim: function (value) {
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return value.trim();
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},
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toLowerCase: function (value) {
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return value.toLowerCase();
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},
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toUpperCase: function (value) {
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return value.toUpperCase();
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},
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toEnumCase: function (value, cfg) {
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return cfg.hash[makeHashTableKey(value)] || value;
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}
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};
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defFunc.definition = {
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type: 'string',
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errors: false,
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modifying: true,
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valid: true,
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compile: function (schema, parentSchema) {
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var cfg;
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if (schema.indexOf('toEnumCase') !== -1) {
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// build hash table to enum values
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cfg = {hash: {}};
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// requires `enum` in schema
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if (!parentSchema.enum)
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throw new Error('Missing enum. To use `transform:["toEnumCase"]`, `enum:[...]` is required.');
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for (var i = parentSchema.enum.length; i--; i) {
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var v = parentSchema.enum[i];
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if (typeof v !== 'string') continue;
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var k = makeHashTableKey(v);
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// requires all `enum` values have unique keys
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if (cfg.hash[k])
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throw new Error('Invalid enum uniqueness. To use `transform:["toEnumCase"]`, all values must be unique when case insensitive.');
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cfg.hash[k] = v;
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}
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}
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return function (data, dataPath, object, key) {
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// skip if value only
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if (!object) return;
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// apply transform in order provided
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for (var j = 0, l = schema.length; j < l; j++)
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data = transform[schema[j]](data, cfg);
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object[key] = data;
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};
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},
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metaSchema: {
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type: 'array',
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items: {
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type: 'string',
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enum: [
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'trimLeft', 'trimRight', 'trim',
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'toLowerCase', 'toUpperCase', 'toEnumCase'
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]
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}
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}
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};
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ajv.addKeyword('transform', defFunc.definition);
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return ajv;
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function makeHashTableKey (value) {
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return value.toLowerCase();
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}
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};
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