Mercurial > hg > truffle
annotate graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/parser/MethodSpecParser.java @ 20940:476374f3fe9a
Truffle-DSL: generate better polymorphic execute signatures
author | Christian Humer <christian.humer@gmail.com> |
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date | Tue, 14 Apr 2015 15:12:48 +0200 |
parents | 18c0f02fa4d2 |
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1 /* |
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 package com.oracle.truffle.dsl.processor.parser; |
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24 |
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25 import static com.oracle.truffle.dsl.processor.java.ElementUtils.*; |
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26 |
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27 import java.util.*; |
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28 |
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29 import javax.lang.model.element.*; |
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30 import javax.lang.model.type.*; |
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31 |
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32 import com.oracle.truffle.dsl.processor.java.*; |
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33 import com.oracle.truffle.dsl.processor.java.model.*; |
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34 import com.oracle.truffle.dsl.processor.model.*; |
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35 |
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36 public final class MethodSpecParser { |
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37 |
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38 private boolean emitErrors = true; |
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39 private boolean useVarArgs = false; |
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40 |
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41 private final Template template; |
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42 |
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43 public MethodSpecParser(Template template) { |
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44 this.template = template; |
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45 } |
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46 |
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47 public Template getTemplate() { |
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48 return template; |
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49 } |
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50 |
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51 public boolean isEmitErrors() { |
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52 return emitErrors; |
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53 } |
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54 |
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55 public boolean isUseVarArgs() { |
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56 return useVarArgs; |
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57 } |
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58 |
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59 public void setEmitErrors(boolean emitErrors) { |
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60 this.emitErrors = emitErrors; |
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61 } |
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62 |
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63 public void setUseVarArgs(boolean useVarArgs) { |
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64 this.useVarArgs = useVarArgs; |
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65 } |
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66 |
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67 public TemplateMethod parse(MethodSpec methodSpecification, ExecutableElement method, AnnotationMirror annotation, int naturalOrder) { |
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68 if (methodSpecification == null) { |
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69 return null; |
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70 } |
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71 |
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72 methodSpecification.applyTypeDefinitions("types"); |
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73 |
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74 String id = method.getSimpleName().toString(); |
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75 TypeMirror returnType = method.getReturnType(); |
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76 return parseImpl(methodSpecification, naturalOrder, id, method, annotation, returnType, method.getParameters()); |
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77 } |
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78 |
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79 public TemplateMethod parseImpl(MethodSpec methodSpecification, int naturalOrder, String id, ExecutableElement method, AnnotationMirror annotation, TypeMirror returnType, |
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80 List<? extends VariableElement> parameterTypes) { |
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81 ParameterSpec returnTypeSpec = methodSpecification.getReturnType(); |
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82 Parameter returnTypeMirror = matchParameter(returnTypeSpec, new CodeVariableElement(returnType, "returnType"), -1, -1); |
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83 if (returnTypeMirror == null) { |
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84 if (isEmitErrors() && method != null) { |
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85 TemplateMethod invalidMethod = new TemplateMethod(id, naturalOrder, template, methodSpecification, method, annotation, returnTypeMirror, Collections.<Parameter> emptyList()); |
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86 String expectedReturnType = returnTypeSpec.toSignatureString(true); |
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87 String actualReturnType = ElementUtils.getSimpleName(returnType); |
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88 |
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89 String message = String.format("The provided return type \"%s\" does not match expected return type \"%s\".\nExpected signature: \n %s", actualReturnType, expectedReturnType, |
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90 methodSpecification.toSignatureString(method.getSimpleName().toString())); |
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91 invalidMethod.addError(message); |
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92 return invalidMethod; |
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93 } else { |
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94 return null; |
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95 } |
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96 } |
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97 |
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98 List<Parameter> parameters = parseParameters(methodSpecification, parameterTypes, isUseVarArgs() && method != null ? method.isVarArgs() : false); |
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99 if (parameters == null) { |
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100 if (isEmitErrors() && method != null) { |
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101 TemplateMethod invalidMethod = new TemplateMethod(id, naturalOrder, template, methodSpecification, method, annotation, returnTypeMirror, Collections.<Parameter> emptyList()); |
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102 String message = String.format("Method signature %s does not match to the expected signature: \n%s", createActualSignature(method), |
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103 methodSpecification.toSignatureString(method.getSimpleName().toString())); |
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104 invalidMethod.addError(message); |
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105 return invalidMethod; |
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106 } else { |
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107 return null; |
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108 } |
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109 } |
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110 |
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111 return new TemplateMethod(id, naturalOrder, template, methodSpecification, method, annotation, returnTypeMirror, parameters); |
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112 } |
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113 |
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114 private static String createActualSignature(ExecutableElement method) { |
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115 StringBuilder b = new StringBuilder("("); |
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116 String sep = ""; |
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117 if (method != null) { |
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118 for (VariableElement var : method.getParameters()) { |
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119 b.append(sep); |
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120 b.append(ElementUtils.getSimpleName(var.asType())); |
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121 sep = ", "; |
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122 } |
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123 } |
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124 b.append(")"); |
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125 return b.toString(); |
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126 } |
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127 |
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128 /* |
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129 * Parameter parsing tries to parse required arguments starting from offset 0 with increasing |
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130 * offset until it finds a signature end that matches the required specification. If there is no |
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131 * end matching the required arguments, parsing fails. Parameters prior to the parsed required |
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132 * ones are cut and used to parse the optional parameters. |
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133 */ |
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134 private static List<Parameter> parseParameters(MethodSpec spec, List<? extends VariableElement> parameterTypes, boolean varArgs) { |
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135 List<Parameter> parsedRequired = null; |
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136 int offset = 0; |
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137 for (; offset <= parameterTypes.size(); offset++) { |
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138 List<VariableElement> parameters = new ArrayList<>(); |
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139 parameters.addAll(parameterTypes.subList(offset, parameterTypes.size())); |
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140 parsedRequired = parseParametersRequired(spec, parameters, varArgs); |
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141 if (parsedRequired != null) { |
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142 break; |
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143 } |
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144 } |
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145 |
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146 if (parsedRequired == null) { |
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147 return null; |
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148 } |
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149 |
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150 if (parsedRequired.isEmpty() && offset == 0) { |
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151 offset = parameterTypes.size(); |
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152 } |
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153 List<? extends VariableElement> potentialOptionals = parameterTypes.subList(0, offset); |
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154 List<Parameter> parsedOptionals = parseParametersOptional(spec, potentialOptionals); |
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155 if (parsedOptionals == null) { |
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156 return null; |
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157 } |
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158 |
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159 List<Parameter> finalParameters = new ArrayList<>(); |
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160 finalParameters.addAll(parsedOptionals); |
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161 finalParameters.addAll(parsedRequired); |
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162 return finalParameters; |
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163 } |
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164 |
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165 private static List<Parameter> parseParametersOptional(MethodSpec spec, List<? extends VariableElement> types) { |
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166 List<Parameter> parsedParams = new ArrayList<>(); |
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167 |
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168 int typeStartIndex = 0; |
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169 List<ParameterSpec> specifications = spec.getOptional(); |
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170 outer: for (int specIndex = 0; specIndex < specifications.size(); specIndex++) { |
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171 ParameterSpec specification = specifications.get(specIndex); |
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172 for (int typeIndex = typeStartIndex; typeIndex < types.size(); typeIndex++) { |
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173 VariableElement variable = types.get(typeIndex); |
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174 Parameter optionalParam = matchParameter(specification, variable, -1, -1); |
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175 if (optionalParam != null) { |
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176 parsedParams.add(optionalParam); |
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177 typeStartIndex = typeIndex + 1; |
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178 continue outer; |
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179 } |
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180 } |
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181 } |
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182 |
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183 if (typeStartIndex < types.size()) { |
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184 // not enough types found |
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185 return null; |
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186 } |
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187 return parsedParams; |
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188 } |
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189 |
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190 private static List<Parameter> parseParametersRequired(MethodSpec spec, List<VariableElement> types, boolean typeVarArgs) { |
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191 List<Parameter> parsedParams = new ArrayList<>(); |
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192 List<ParameterSpec> specifications = spec.getRequired(); |
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193 boolean specVarArgs = spec.isVariableRequiredParameters(); |
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194 int typeIndex = 0; |
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195 int specificationIndex = 0; |
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196 |
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197 ParameterSpec specification; |
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198 while ((specification = nextSpecification(specifications, specificationIndex, specVarArgs)) != null) { |
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199 VariableElement actualType = nextActualType(types, typeIndex, typeVarArgs); |
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200 if (actualType == null) { |
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201 if (spec.isIgnoreAdditionalSpecifications()) { |
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202 break; |
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203 } |
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204 return null; |
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205 } |
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206 |
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207 int typeVarArgsIndex = typeVarArgs ? typeIndex - types.size() + 1 : -1; |
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208 int specVarArgsIndex = specVarArgs ? specificationIndex - specifications.size() + 1 : -1; |
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209 |
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210 if (typeVarArgsIndex >= 0 && specVarArgsIndex >= 0) { |
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211 // both specifications and types have a variable number of arguments |
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212 // we would get into an endless loop if we would continue |
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213 break; |
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214 } |
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215 |
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216 Parameter resolvedParameter = matchParameter(specification, actualType, specVarArgsIndex, typeVarArgsIndex); |
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217 if (resolvedParameter == null) { |
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218 return null; |
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219 } |
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220 parsedParams.add(resolvedParameter); |
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221 typeIndex++; |
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222 specificationIndex++; |
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223 } |
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224 |
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225 // consume randomly ordered annotated parameters |
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226 VariableElement variable; |
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227 while ((variable = nextActualType(types, typeIndex, typeVarArgs)) != null) { |
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228 Parameter matchedParamter = matchAnnotatedParameter(spec, variable); |
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229 if (matchedParamter == null) { |
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230 break; |
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231 } |
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232 parsedParams.add(matchedParamter); |
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233 typeIndex++; |
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234 } |
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235 |
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236 if (typeIndex < types.size()) { |
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237 if (spec.isIgnoreAdditionalParameters()) { |
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238 return parsedParams; |
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239 } else { |
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240 return null; |
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241 } |
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242 } |
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243 |
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244 return parsedParams; |
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245 } |
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246 |
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247 private static Parameter matchAnnotatedParameter(MethodSpec spec, VariableElement variable) { |
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248 for (ParameterSpec parameterSpec : spec.getAnnotations()) { |
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249 if (parameterSpec.matches(variable)) { |
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250 Parameter matchedParameter = matchParameter(parameterSpec, variable, -1, -1); |
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251 if (matchedParameter != null) { |
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252 matchedParameter.setLocalName(variable.getSimpleName().toString()); |
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253 return matchedParameter; |
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254 } |
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255 } |
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256 } |
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257 return null; |
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258 } |
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259 |
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260 private static ParameterSpec nextSpecification(List<ParameterSpec> specifications, int specIndex, boolean varArgs) { |
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261 if (varArgs && specIndex >= specifications.size() - 1 && !specifications.isEmpty()) { |
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262 return specifications.get(specifications.size() - 1); |
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263 } else if (specIndex < specifications.size()) { |
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264 return specifications.get(specIndex); |
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265 } else { |
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266 return null; |
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267 } |
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268 } |
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269 |
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270 private static VariableElement nextActualType(List<VariableElement> types, int typeIndex, boolean varArgs) { |
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271 if (varArgs && typeIndex >= types.size() - 1 && !types.isEmpty()) { |
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272 // unpack varargs array argument |
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273 VariableElement actualType = types.get(types.size() - 1); |
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274 if (actualType.asType().getKind() == TypeKind.ARRAY) { |
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275 actualType = new CodeVariableElement(((ArrayType) actualType.asType()).getComponentType(), actualType.getSimpleName().toString()); |
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276 } |
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277 return actualType; |
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278 } else if (typeIndex < types.size()) { |
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279 return types.get(typeIndex); |
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280 } else { |
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281 return null; |
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282 } |
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283 } |
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284 |
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285 private static Parameter matchParameter(ParameterSpec specification, VariableElement variable, int specificationIndex, int varArgsIndex) { |
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286 TypeMirror resolvedType = variable.asType(); |
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287 if (hasError(resolvedType)) { |
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288 return null; |
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289 } |
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290 |
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291 if (!specification.matches(variable)) { |
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292 return null; |
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293 } |
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294 |
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295 return new Parameter(specification, variable, specificationIndex, varArgsIndex); |
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296 } |
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297 } |