1 | import _ from 'lodash';
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2 | import ts from 'typescript';
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3 | import { heritage, modifier, overload, parametered } from './base';
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4 | import * as declaration from './declaration';
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5 | import * as node_ from './node';
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6 | import * as reference from './reference';
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7 | import * as symbol_ from './symbol';
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8 | import * as type_ from './type_';
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9 | import * as utils from './utils';
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10 | export function isClassProperty(node) {
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11 | return ts.isPropertyDeclaration(node) || ts.isGetAccessorDeclaration(node) || ts.isSetAccessorDeclaration(node);
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12 | }
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13 | export function isClassInstanceProperty(node) {
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14 | return (isClassProperty(node) || ts.isParameterPropertyDeclaration(node)) && !modifier.isStatic(node);
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15 | }
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16 | export function isClassInstanceMember(node) {
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17 | return (ts.isMethodDeclaration(node) || isClassInstanceProperty(node)) && !modifier.isStatic(node);
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18 | }
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19 | export function isClassStaticProperty(node) {
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20 | return (ts.isMethodDeclaration(node) || isClassProperty(node)) && modifier.isStatic(node);
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21 | }
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22 | export function isClassStaticMember(node) {
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23 | return (ts.isMethodDeclaration(node) || isClassProperty(node)) && modifier.isStatic(node);
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24 | }
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25 | export function isClassMember(node) {
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26 | return isClassInstanceMember(node) || isClassStaticMember(node);
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27 | }
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28 | export function getExtends(node) {
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29 | const extendsClause = heritage.getHeritageClauseByKind(node, ts.SyntaxKind.ExtendsKeyword);
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30 | if (extendsClause === undefined) {
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31 | return undefined;
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32 | }
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33 | const typeNodes = heritage.getTypeNodes(extendsClause);
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34 | return typeNodes.length === 0 ? undefined : typeNodes[0];
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35 | }
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36 | export function getExtendsOrThrow(node) {
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37 | return utils.throwIfNullOrUndefined(getExtends(node), 'extends expression');
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38 | }
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39 | export function getImplements(node) {
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40 | const implementsClause = heritage.getHeritageClauseByKind(node, ts.SyntaxKind.ImplementsKeyword);
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41 | if (implementsClause === undefined) {
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42 | return undefined;
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43 | }
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44 | return heritage.getTypeNodes(implementsClause);
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45 | }
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46 | export function getImplementsArray(node) {
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47 | return utils.getArray(getImplements(node));
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48 | }
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49 | export function getMembers(node) {
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50 | const members = [...node.members];
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51 | const implementationCtors = members.filter(ts.isConstructorDeclaration).filter((c) => overload.isImplementation(c));
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52 | for (const ctor of implementationCtors) {
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53 | let insertIndex = members.indexOf(ctor) + 1;
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54 | for (const param of parametered.getParameters(ctor)) {
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55 | if (ts.isParameterPropertyDeclaration(param)) {
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56 | members.splice(insertIndex, 0, param);
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57 | insertIndex += 1;
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58 | }
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59 | }
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60 | }
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61 | return members.filter(isClassMember);
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62 | }
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63 | export function getConcreteMembers(node) {
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64 | return declaration.isAmbient(node)
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65 | ? []
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66 | : getMembers(node).filter((member) => {
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67 | if (ts.isMethodDeclaration(member)) {
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68 | return overload.isImplementation(member);
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69 | }
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70 | return true;
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71 | });
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72 | }
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73 | export function getInstanceProperties(node) {
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74 | return getMembers(node).filter(isClassInstanceProperty);
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75 | }
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76 | export function getInstanceMembers(node) {
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77 | return getMembers(node).filter(isClassInstanceMember);
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78 | }
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79 | export function getInstanceMethods(node) {
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80 | return getInstanceMembers(node).filter(ts.isMethodDeclaration);
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81 | }
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82 | export function getMethods(node) {
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83 | return getMembers(node).filter(ts.isMethodDeclaration);
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84 | }
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85 | export function getSetAccessors(node) {
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86 | return getMembers(node).filter(ts.isSetAccessor);
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87 | }
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88 | export function getInstanceMethod(node, name) {
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89 | return getInstanceMethods(node).find((method) => node_.getName(method) === name);
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90 | }
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91 | export function getConcreteInstanceProperties(node) {
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92 | return getConcreteMembers(node).filter(isClassInstanceProperty);
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93 | }
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94 | export function getConcreteInstanceMembers(node) {
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95 | return getConcreteMembers(node).filter(isClassInstanceMember);
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96 | }
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97 | export function getConcreteInstanceMethods(node) {
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98 | return getConcreteInstanceMembers(node).filter(ts.isMethodDeclaration);
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99 | }
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100 | export function getStaticProperties(node) {
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101 | return getMembers(node).filter(isClassStaticProperty);
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102 | }
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103 | export function getStaticMembers(node) {
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104 | return getMembers(node).filter(isClassStaticMember);
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105 | }
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106 | export function getConcreteStaticProperties(node) {
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107 | return getConcreteMembers(node).filter(isClassStaticProperty);
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108 | }
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109 | export function getConcreteStaticMembers(node) {
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110 | return getConcreteMembers(node).filter(isClassStaticMember);
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111 | }
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112 | export function getConcreteStaticMethods(node) {
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113 | return getConcreteStaticMembers(node).filter(ts.isMethodDeclaration);
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114 | }
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115 | export function getConstructors(node) {
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116 | return node.members.filter(ts.isConstructorDeclaration);
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117 | }
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118 | export function getConcreteConstructor(node) {
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119 | return getConstructors(node).find((ctor) => overload.isImplementation(ctor));
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120 | }
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121 | export function getFirstConcreteConstructor(typeChecker, node) {
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122 | const ctor = getConcreteConstructor(node);
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123 | if (ctor !== undefined) {
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124 | return ctor;
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125 | }
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126 | const baseClass = getBaseClass(typeChecker, node);
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127 | if (baseClass === undefined) {
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128 | return undefined;
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129 | }
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130 | return getFirstConcreteConstructor(typeChecker, baseClass);
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131 | }
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132 | function getDerivedClassesWorker(program, languageService, node, seen = new Set()) {
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133 | if (seen.has(node)) {
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134 | return [];
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135 | }
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136 | return reference
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137 | .findReferencesAsNodes(program, languageService, node)
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138 | .reduce((acc, ref) => {
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139 | const parent = node_.getParent(ref);
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140 | if (parent === undefined) {
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141 | return acc;
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142 | }
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143 | const clause = node_.getParent(parent);
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144 | if (clause === undefined || !ts.isHeritageClause(clause) || !heritage.isExtends(clause)) {
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145 | return acc;
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146 | }
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147 | const derived = node_.getFirstAncestorByKindOrThrow(clause, ts.SyntaxKind.ClassDeclaration);
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148 | return acc.concat(getDerivedClassesWorker(program, languageService, derived, seen));
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149 | }, [])
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150 | .concat([node]);
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151 | }
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152 | export function getDerivedClasses(program, languageService, node) {
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153 | const result = getDerivedClassesWorker(program, languageService, node);
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154 | return result.filter((value) => value !== node);
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155 | }
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156 | function getImplementorsWorker(program, languageService, node, seen = new Set()) {
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157 | if (seen.has(node)) {
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158 | return [];
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159 | }
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160 | return reference
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161 | .findReferencesAsNodes(program, languageService, node)
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162 | .reduce((acc, ref) => {
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163 | const parent = node_.getParent(ref);
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164 | if (parent === undefined) {
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165 | return acc;
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166 | }
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167 | const clause = node_.getParent(parent);
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168 | if (clause === undefined ||
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169 | !ts.isHeritageClause(clause) ||
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170 | (!heritage.isImplements(clause) && !heritage.isExtends(clause))) {
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171 | return acc;
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172 | }
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173 | let derived = node_.getFirstAncestorByKind(clause, ts.SyntaxKind.ClassDeclaration);
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174 | if (derived === undefined) {
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175 | derived = node_.getFirstAncestorByKindOrThrow(clause, ts.SyntaxKind.InterfaceDeclaration);
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176 | }
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177 | return acc.concat(getImplementorsWorker(program, languageService, derived, seen));
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178 | }, [])
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179 | .concat(ts.isClassDeclaration(node) ? [node] : []);
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180 | }
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181 | export function getImplementors(program, languageService, node) {
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182 | return getImplementorsWorker(program, languageService, node);
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183 | }
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184 | function getExtendorsWorker(program, languageService, node, seen = new Set()) {
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185 | if (seen.has(node)) {
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186 | return [];
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187 | }
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188 | return reference
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189 | .findReferencesAsNodes(program, languageService, node)
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190 | .reduce((acc, ref) => {
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191 | const parent = node_.getParent(ref);
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192 | if (parent === undefined) {
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193 | return acc;
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194 | }
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195 | const clause = node_.getParent(parent);
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196 | if (clause === undefined || !ts.isHeritageClause(clause) || !heritage.isExtends(clause)) {
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197 | return acc;
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198 | }
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199 | const derived = node_.getFirstAncestorByTestOrThrow(clause, ts.isClassDeclaration);
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200 | return acc.concat(getImplementorsWorker(program, languageService, derived, seen));
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201 | }, [])
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202 | .concat(ts.isClassDeclaration(node) ? [node] : []);
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203 | }
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204 | export function getExtendors(program, languageService, node) {
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205 | return getExtendorsWorker(program, languageService, node);
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206 | }
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207 | export function getBaseTypes(typeChecker, node) {
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208 | return type_.getBaseTypesArray(type_.getType(typeChecker, node));
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209 | }
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210 | export function getBaseTypesFlattened(typeChecker, node) {
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211 | function getBaseTypesWorker(type) {
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212 | if (type_.isIntersection(type)) {
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213 | return _.flatten(type_.getIntersectionTypesArray(type).map(getBaseTypesWorker));
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214 | }
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215 | const baseTypes = type_.getBaseTypesArray(type);
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216 | return [type].concat(_.flatten(baseTypes.map(getBaseTypesWorker)));
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217 | }
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218 | return _.flatten(getBaseTypes(typeChecker, node).map(getBaseTypesWorker));
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219 | }
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220 | export function getBaseClasses(typeChecker, node) {
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221 | const baseTypes = getBaseTypesFlattened(typeChecker, node);
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222 | return baseTypes
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223 | .map((type) => type_.getSymbol(type))
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224 | .filter(utils.notNull)
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225 | .map((symbol) => symbol_.getDeclarations(symbol))
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226 | .reduce((a, b) => a.concat(b), [])
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227 | .filter(ts.isClassDeclaration);
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228 | }
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229 | export function getBaseClass(typeChecker, node) {
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230 | const declarations = getBaseClasses(typeChecker, node);
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231 | return declarations.length === 1 ? declarations[0] : undefined;
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232 | }
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233 |
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234 | //# 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_ from 'lodash';\nimport ts from 'typescript';\nimport { heritage, modifier, overload, parametered } from './base';\nimport * as declaration from './declaration';\nimport * as node_ from './node';\nimport * as reference from './reference';\nimport * as symbol_ from './symbol';\nimport * as type_ from './type_';\nimport * as utils from './utils';\n\nexport type ClassPropertyType = ts.PropertyDeclaration | ts.GetAccessorDeclaration | ts.SetAccessorDeclaration;\nexport function isClassProperty(node: ts.Node): node is ClassPropertyType {\n  return ts.isPropertyDeclaration(node) || ts.isGetAccessorDeclaration(node) || ts.isSetAccessorDeclaration(node);\n}\n\nexport type ClassInstancePropertyType = ClassPropertyType | ts.ParameterPropertyDeclaration;\nexport function isClassInstanceProperty(node: ts.Node): node is ClassInstancePropertyType {\n  return (isClassProperty(node) || ts.isParameterPropertyDeclaration(node)) && !modifier.isStatic(node);\n}\n\nexport type ClassInstanceMemberType = ts.MethodDeclaration | ClassInstancePropertyType;\nexport function isClassInstanceMember(node: ts.Node): node is ClassInstanceMemberType {\n  return (ts.isMethodDeclaration(node) || isClassInstanceProperty(node)) && !modifier.isStatic(node);\n}\n\nexport type ClassStaticPropertyType = ClassPropertyType;\nexport function isClassStaticProperty(node: ts.Node): node is ClassStaticPropertyType {\n  return (ts.isMethodDeclaration(node) || isClassProperty(node)) && modifier.isStatic(node);\n}\n\nexport type ClassStaticMemberType = ts.MethodDeclaration | ClassStaticPropertyType;\nexport function isClassStaticMember(node: ts.Node): node is ClassStaticMemberType {\n  return (ts.isMethodDeclaration(node) || isClassProperty(node)) && modifier.isStatic(node);\n}\n\nexport type ClassMemberType = ClassInstanceMemberType | ClassStaticMemberType;\nexport function isClassMember(node: ts.Node): node is ClassMemberType {\n  return isClassInstanceMember(node) || isClassStaticMember(node);\n}\n\nexport function getExtends(node: ts.ClassDeclaration | ts.ClassExpression): ts.ExpressionWithTypeArguments | undefined {\n  const extendsClause = heritage.getHeritageClauseByKind(node, ts.SyntaxKind.ExtendsKeyword);\n  if (extendsClause === undefined) {\n    return undefined;\n  }\n\n  const typeNodes = heritage.getTypeNodes(extendsClause);\n\n  return typeNodes.length === 0 ? undefined : typeNodes[0];\n}\n\nexport function getExtendsOrThrow(node: ts.ClassDeclaration | ts.ClassExpression): ts.ExpressionWithTypeArguments {\n  return utils.throwIfNullOrUndefined(getExtends(node), 'extends expression');\n}\n\nexport function getImplements(\n  node: ts.ClassDeclaration | ts.ClassExpression,\n): readonly ts.ExpressionWithTypeArguments[] | undefined {\n  const implementsClause = heritage.getHeritageClauseByKind(node, ts.SyntaxKind.ImplementsKeyword);\n  if (implementsClause === undefined) {\n    return undefined;\n  }\n\n  return heritage.getTypeNodes(implementsClause);\n}\n\nexport function getImplementsArray(\n  node: ts.ClassDeclaration | ts.ClassExpression,\n): readonly ts.ExpressionWithTypeArguments[] {\n  return utils.getArray(getImplements(node));\n}\n\nexport function getMembers(node: ts.ClassDeclaration | ts.ClassExpression): readonly ClassMemberType[] {\n  // tslint:disable-next-line readonly-array\n  const members: Array<ts.ClassElement | ts.ParameterPropertyDeclaration> = [...node.members];\n  const implementationCtors = members.filter(ts.isConstructorDeclaration).filter((c) => overload.isImplementation(c));\n  // tslint:disable-next-line no-loop-statement\n  for (const ctor of implementationCtors) {\n    // insert after the constructor\n    let insertIndex = members.indexOf(ctor) + 1;\n    // tslint:disable-next-line no-loop-statement\n    for (const param of parametered.getParameters(ctor)) {\n      if (ts.isParameterPropertyDeclaration(param)) {\n        // tslint:disable-next-line no-array-mutation\n        members.splice(insertIndex, 0, param);\n        insertIndex += 1;\n      }\n    }\n  }\n\n  return members.filter(isClassMember);\n}\n\nexport function getConcreteMembers(node: ts.ClassDeclaration | ts.ClassExpression): readonly ClassMemberType[] {\n  return declaration.isAmbient(node)\n    ? []\n    : getMembers(node).filter((member) => {\n        if (ts.isMethodDeclaration(member)) {\n          return overload.isImplementation(member);\n        }\n\n        return true;\n      });\n}\n\nexport function getInstanceProperties(\n  node: ts.ClassDeclaration | ts.ClassExpression,\n): readonly ClassInstancePropertyType[] {\n  return getMembers(node).filter(isClassInstanceProperty);\n}\n\nexport function getInstanceMembers(node: ts.ClassDeclaration | ts.ClassExpression): readonly ClassInstanceMemberType[] {\n  return getMembers(node).filter(isClassInstanceMember);\n}\n\nexport function getInstanceMethods(node: ts.ClassDeclaration | ts.ClassExpression): readonly ts.MethodDeclaration[] {\n  return getInstanceMembers(node).filter(ts.isMethodDeclaration);\n}\n\nexport function getMethods(node: ts.ClassDeclaration | ts.ClassExpression): readonly ts.MethodDeclaration[] {\n  return getMembers(node).filter(ts.isMethodDeclaration);\n}\n\nexport function getSetAccessors(node: ts.ClassDeclaration | ts.ClassExpression): readonly ts.SetAccessorDeclaration[] {\n  return getMembers(node).filter(ts.isSetAccessor);\n}\n\nexport function getInstanceMethod(\n  node: ts.ClassDeclaration | ts.ClassExpression,\n  name: string,\n): ts.MethodDeclaration | undefined {\n  return getInstanceMethods(node).find((method) => node_.getName(method) === name);\n}\n\nexport function getConcreteInstanceProperties(\n  node: ts.ClassDeclaration | ts.ClassExpression,\n): readonly ClassInstancePropertyType[] {\n  return getConcreteMembers(node).filter(isClassInstanceProperty);\n}\n\nexport function getConcreteInstanceMembers(\n  node: ts.ClassDeclaration | ts.ClassExpression,\n): readonly ClassInstanceMemberType[] {\n  return getConcreteMembers(node).filter(isClassInstanceMember);\n}\n\nexport function getConcreteInstanceMethods(\n  node: ts.ClassDeclaration | ts.ClassExpression,\n): readonly ts.MethodDeclaration[] {\n  return getConcreteInstanceMembers(node).filter(ts.isMethodDeclaration);\n}\n\nexport function getStaticProperties(\n  node: ts.ClassDeclaration | ts.ClassExpression,\n): readonly ClassStaticPropertyType[] {\n  return getMembers(node).filter(isClassStaticProperty);\n}\n\nexport function getStaticMembers(node: ts.ClassDeclaration | ts.ClassExpression): readonly ClassStaticMemberType[] {\n  return getMembers(node).filter(isClassStaticMember);\n}\n\nexport function getConcreteStaticProperties(\n  node: ts.ClassDeclaration | ts.ClassExpression,\n): readonly ClassStaticPropertyType[] {\n  return getConcreteMembers(node).filter(isClassStaticProperty);\n}\n\nexport function getConcreteStaticMembers(\n  node: ts.ClassDeclaration | ts.ClassExpression,\n): readonly ClassStaticMemberType[] {\n  return getConcreteMembers(node).filter(isClassStaticMember);\n}\n\nexport function getConcreteStaticMethods(\n  node: ts.ClassDeclaration | ts.ClassExpression,\n): readonly ts.MethodDeclaration[] {\n  return getConcreteStaticMembers(node).filter(ts.isMethodDeclaration);\n}\n\nexport function getConstructors(node: ts.ClassDeclaration | ts.ClassExpression): readonly ts.ConstructorDeclaration[] {\n  return node.members.filter(ts.isConstructorDeclaration);\n}\n\nexport function getConcreteConstructor(\n  node: ts.ClassDeclaration | ts.ClassExpression,\n): ts.ConstructorDeclaration | undefined {\n  return getConstructors(node).find((ctor) => overload.isImplementation(ctor));\n}\n\nexport function getFirstConcreteConstructor(\n  typeChecker: ts.TypeChecker,\n  node: ts.ClassDeclaration,\n): ts.ConstructorDeclaration | undefined {\n  const ctor = getConcreteConstructor(node);\n  if (ctor !== undefined) {\n    return ctor;\n  }\n\n  const baseClass = getBaseClass(typeChecker, node);\n  if (baseClass === undefined) {\n    return undefined;\n  }\n\n  return getFirstConcreteConstructor(typeChecker, baseClass);\n}\n\nfunction getDerivedClassesWorker(\n  program: ts.Program,\n  languageService: ts.LanguageService,\n  node: ts.ClassDeclaration,\n  seen = new Set<ts.ClassDeclaration>(),\n): readonly ts.ClassDeclaration[] {\n  if (seen.has(node)) {\n    return [];\n  }\n\n  return reference\n    .findReferencesAsNodes(program, languageService, node)\n    .reduce<readonly ts.ClassDeclaration[]>((acc, ref) => {\n      const parent = node_.getParent(ref) as ts.Node | undefined;\n      if (parent === undefined) {\n        return acc;\n      }\n\n      const clause = node_.getParent(parent) as ts.Node | undefined;\n      if (clause === undefined || !ts.isHeritageClause(clause) || !heritage.isExtends(clause)) {\n        return acc;\n      }\n\n      const derived = node_.getFirstAncestorByKindOrThrow<ts.ClassDeclaration>(clause, ts.SyntaxKind.ClassDeclaration);\n\n      return acc.concat(getDerivedClassesWorker(program, languageService, derived, seen));\n    }, [])\n    .concat([node]);\n}\n\nexport function getDerivedClasses(\n  program: ts.Program,\n  languageService: ts.LanguageService,\n  node: ts.ClassDeclaration,\n): readonly ts.ClassDeclaration[] {\n  const result = getDerivedClassesWorker(program, languageService, node);\n\n  return result.filter((value) => value !== node);\n}\n\nfunction getImplementorsWorker(\n  program: ts.Program,\n  languageService: ts.LanguageService,\n  node: ts.ClassDeclaration | ts.InterfaceDeclaration,\n  seen = new Set<ts.ClassDeclaration | ts.InterfaceDeclaration>(),\n): readonly ts.ClassDeclaration[] {\n  if (seen.has(node)) {\n    return [];\n  }\n\n  return reference\n    .findReferencesAsNodes(program, languageService, node)\n    .reduce<readonly ts.ClassDeclaration[]>((acc, ref) => {\n      const parent = node_.getParent(ref) as ts.Node | undefined;\n      if (parent === undefined) {\n        return acc;\n      }\n\n      const clause = node_.getParent(parent) as ts.Node | undefined;\n      if (\n        clause === undefined ||\n        !ts.isHeritageClause(clause) ||\n        (!heritage.isImplements(clause) && !heritage.isExtends(clause))\n      ) {\n        return acc;\n      }\n\n      let derived: ts.ClassDeclaration | ts.InterfaceDeclaration | undefined = node_.getFirstAncestorByKind<\n        ts.ClassDeclaration\n      >(clause, ts.SyntaxKind.ClassDeclaration);\n      if (derived === undefined) {\n        derived = node_.getFirstAncestorByKindOrThrow<ts.InterfaceDeclaration>(\n          clause,\n          ts.SyntaxKind.InterfaceDeclaration,\n        );\n      }\n\n      return acc.concat(getImplementorsWorker(program, languageService, derived, seen));\n    }, [])\n    .concat(ts.isClassDeclaration(node) ? [node] : []);\n}\n\nexport function getImplementors(\n  program: ts.Program,\n  languageService: ts.LanguageService,\n  node: ts.InterfaceDeclaration,\n): readonly ts.ClassDeclaration[] {\n  return getImplementorsWorker(program, languageService, node);\n}\n\nfunction getExtendorsWorker(\n  program: ts.Program,\n  languageService: ts.LanguageService,\n  node: ts.ClassDeclaration,\n  seen = new Set<ts.ClassDeclaration>(),\n): readonly ts.ClassDeclaration[] {\n  if (seen.has(node)) {\n    return [];\n  }\n\n  return reference\n    .findReferencesAsNodes(program, languageService, node)\n    .reduce<readonly ts.ClassDeclaration[]>((acc, ref) => {\n      const parent = node_.getParent(ref) as ts.Node | undefined;\n      if (parent === undefined) {\n        return acc;\n      }\n\n      const clause = node_.getParent(parent) as ts.Node | undefined;\n      if (clause === undefined || !ts.isHeritageClause(clause) || !heritage.isExtends(clause)) {\n        return acc;\n      }\n\n      const derived: ts.ClassDeclaration | undefined = node_.getFirstAncestorByTestOrThrow(\n        clause,\n        ts.isClassDeclaration,\n      );\n\n      return acc.concat(getImplementorsWorker(program, languageService, derived, seen));\n    }, [])\n    .concat(ts.isClassDeclaration(node) ? [node] : []);\n}\n\nexport function getExtendors(\n  program: ts.Program,\n  languageService: ts.LanguageService,\n  node: ts.ClassDeclaration,\n): readonly ts.ClassDeclaration[] {\n  return getExtendorsWorker(program, languageService, node);\n}\n\nexport function getBaseTypes(\n  typeChecker: ts.TypeChecker,\n  node: ts.ClassDeclaration | ts.ClassExpression | ts.InterfaceDeclaration,\n): readonly ts.Type[] {\n  return type_.getBaseTypesArray(type_.getType(typeChecker, node));\n}\n\nexport function getBaseTypesFlattened(\n  typeChecker: ts.TypeChecker,\n  node: ts.ClassDeclaration | ts.ClassExpression | ts.InterfaceDeclaration,\n): readonly ts.Type[] {\n  function getBaseTypesWorker(type: ts.Type): readonly ts.Type[] {\n    if (type_.isIntersection(type)) {\n      return _.flatten(type_.getIntersectionTypesArray(type).map(getBaseTypesWorker));\n    }\n\n    const baseTypes = type_.getBaseTypesArray(type);\n\n    return [type].concat(_.flatten(baseTypes.map(getBaseTypesWorker)));\n  }\n\n  return _.flatten(getBaseTypes(typeChecker, node).map(getBaseTypesWorker));\n}\n\nexport function getBaseClasses(\n  typeChecker: ts.TypeChecker,\n  node: ts.ClassDeclaration | ts.ClassExpression,\n): readonly ts.ClassDeclaration[] {\n  const baseTypes = getBaseTypesFlattened(typeChecker, node);\n\n  return baseTypes\n    .map((type) => type_.getSymbol(type))\n    .filter(utils.notNull)\n    .map((symbol) => symbol_.getDeclarations(symbol))\n    .reduce<readonly ts.Declaration[]>((a, b) => a.concat(b), [])\n    .filter(ts.isClassDeclaration);\n}\n\nexport function getBaseClass(\n  typeChecker: ts.TypeChecker,\n  node: ts.ClassDeclaration | ts.ClassExpression,\n): ts.ClassDeclaration | undefined {\n  const declarations = getBaseClasses(typeChecker, node);\n\n  return declarations.length === 1 ? declarations[0] : undefined;\n}\n"]}
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