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143<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">const GeneratedExpression = require('./generated_expression')
144&nbsp;
145// 256 generated expressions ought to be enough for anybody
146const MAX_EXPRESSIONS = 256
147&nbsp;
148class CombinatorialGeneratedExpressionFactory {
149 constructor(expressionTemplate, parameterTypeCombinations) {
150 this._expressionTemplate = expressionTemplate
151 this._parameterTypeCombinations = parameterTypeCombinations
152 }
153&nbsp;
154 generateExpressions() {
155 const generatedExpressions = []
156 this._generatePermutations(generatedExpressions, 0, [])
157 return generatedExpressions
158 }
159&nbsp;
160 _generatePermutations(generatedExpressions, depth, currentParameterTypes) {
161 <span class="missing-if-branch" title="if path not taken" >I</span>if (generatedExpressions.length &gt;= MAX_EXPRESSIONS) {
162<span class="cstat-no" title="statement not covered" > return</span>
163 }
164&nbsp;
165 if (depth === this._parameterTypeCombinations.length) {
166 generatedExpressions.push(
167 new GeneratedExpression(this._expressionTemplate, currentParameterTypes)
168 )
169 return
170 }
171&nbsp;
172 for (let i = 0; i &lt; this._parameterTypeCombinations[depth].length; ++i) {
173 // Avoid recursion if no elements can be added.
174 if (generatedExpressions.length &gt;= MAX_EXPRESSIONS) {
175 return
176 }
177&nbsp;
178 const newCurrentParameterTypes = currentParameterTypes.slice() // clone
179 newCurrentParameterTypes.push(this._parameterTypeCombinations[depth][i])
180 this._generatePermutations(
181 generatedExpressions,
182 depth + 1,
183 newCurrentParameterTypes
184 )
185 }
186 }
187}
188&nbsp;
189module.exports = CombinatorialGeneratedExpressionFactory
190&nbsp;</pre></td></tr>
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