1 | /**
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2 | * @license
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3 | * Copyright Google LLC All Rights Reserved.
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4 | *
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5 | * Use of this source code is governed by an MIT-style license that can be
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6 | * found in the LICENSE file at https://angular.io/license
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7 | */
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8 | (function (factory) {
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9 | if (typeof module === "object" && typeof module.exports === "object") {
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10 | var v = factory(require, exports);
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11 | if (v !== undefined) module.exports = v;
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12 | }
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13 | else if (typeof define === "function" && define.amd) {
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14 | define("@angular/language-service/src/expression_type", ["require", "exports", "tslib", "@angular/compiler", "@angular/language-service/src/diagnostic_messages", "@angular/language-service/src/symbols", "@angular/language-service/src/utils"], factory);
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15 | }
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16 | })(function (require, exports) {
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17 | ;
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18 | Object.defineProperty(exports, "__esModule", { value: true });
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19 | exports.AstType = void 0;
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20 | var tslib_1 = require("tslib");
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21 | var compiler_1 = require("@angular/compiler");
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22 | var diagnostic_messages_1 = require("@angular/language-service/src/diagnostic_messages");
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23 | var symbols_1 = require("@angular/language-service/src/symbols");
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24 | var utils_1 = require("@angular/language-service/src/utils");
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25 | // AstType calculatetype of the ast given AST element.
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26 | var AstType = /** @class */ (function () {
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27 | function AstType(scope, query, context, source) {
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28 | this.scope = scope;
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29 | this.query = query;
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30 | this.context = context;
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31 | this.source = source;
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32 | this.diagnostics = [];
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33 | }
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34 | AstType.prototype.getType = function (ast) {
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35 | return ast.visit(this);
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36 | };
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37 | AstType.prototype.getDiagnostics = function (ast) {
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38 | var type = ast.visit(this);
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39 | if (this.context.inEvent && type.callable) {
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40 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.callable_expression_expected_method_call));
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41 | }
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42 | return this.diagnostics;
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43 | };
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44 | AstType.prototype.visitUnary = function (ast) {
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45 | // Visit the child to produce diagnostics.
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46 | ast.expr.visit(this);
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47 | // The unary plus and minus operator are always of type number.
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48 | // https://github.com/Microsoft/TypeScript/blob/v1.8.10/doc/spec.md#4.18
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49 | switch (ast.operator) {
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50 | case '-':
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51 | case '+':
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52 | return this.query.getBuiltinType(symbols_1.BuiltinType.Number);
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53 | }
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54 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.unrecognized_operator, ast.operator));
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55 | return this.anyType;
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56 | };
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57 | AstType.prototype.visitBinary = function (ast) {
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58 | var _this_1 = this;
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59 | var getType = function (ast, operation) {
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60 | var type = _this_1.getType(ast);
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61 | if (type.nullable) {
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62 | switch (operation) {
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63 | case '&&':
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64 | case '||':
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65 | case '==':
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66 | case '!=':
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67 | case '===':
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68 | case '!==':
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69 | // Nullable allowed.
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70 | break;
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71 | default:
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72 | _this_1.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.expression_might_be_null));
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73 | break;
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74 | }
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75 | }
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76 | return type;
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77 | };
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78 | var leftType = getType(ast.left, ast.operation);
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79 | var rightType = getType(ast.right, ast.operation);
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80 | var leftKind = this.query.getTypeKind(leftType);
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81 | var rightKind = this.query.getTypeKind(rightType);
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82 | // The following swtich implements operator typing similar to the
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83 | // type production tables in the TypeScript specification.
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84 | // https://github.com/Microsoft/TypeScript/blob/v1.8.10/doc/spec.md#4.19
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85 | var operKind = leftKind << 8 | rightKind;
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86 | switch (ast.operation) {
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87 | case '*':
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88 | case '/':
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89 | case '%':
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90 | case '-':
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91 | case '<<':
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92 | case '>>':
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93 | case '>>>':
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94 | case '&':
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95 | case '^':
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96 | case '|':
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97 | switch (operKind) {
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98 | case symbols_1.BuiltinType.Any << 8 | symbols_1.BuiltinType.Any:
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99 | case symbols_1.BuiltinType.Number << 8 | symbols_1.BuiltinType.Any:
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100 | case symbols_1.BuiltinType.Any << 8 | symbols_1.BuiltinType.Number:
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101 | case symbols_1.BuiltinType.Number << 8 | symbols_1.BuiltinType.Number:
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102 | return this.query.getBuiltinType(symbols_1.BuiltinType.Number);
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103 | default:
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104 | var errorAst = ast.left;
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105 | switch (leftKind) {
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106 | case symbols_1.BuiltinType.Any:
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107 | case symbols_1.BuiltinType.Number:
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108 | errorAst = ast.right;
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109 | break;
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110 | }
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111 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(errorAst.span, diagnostic_messages_1.Diagnostic.expected_a_number_type));
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112 | return this.anyType;
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113 | }
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114 | case '+':
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115 | switch (operKind) {
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116 | case symbols_1.BuiltinType.Any << 8 | symbols_1.BuiltinType.Any:
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117 | case symbols_1.BuiltinType.Any << 8 | symbols_1.BuiltinType.Boolean:
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118 | case symbols_1.BuiltinType.Any << 8 | symbols_1.BuiltinType.Number:
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119 | case symbols_1.BuiltinType.Any << 8 | symbols_1.BuiltinType.Other:
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120 | case symbols_1.BuiltinType.Boolean << 8 | symbols_1.BuiltinType.Any:
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121 | case symbols_1.BuiltinType.Number << 8 | symbols_1.BuiltinType.Any:
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122 | case symbols_1.BuiltinType.Other << 8 | symbols_1.BuiltinType.Any:
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123 | return this.anyType;
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124 | case symbols_1.BuiltinType.Any << 8 | symbols_1.BuiltinType.String:
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125 | case symbols_1.BuiltinType.Boolean << 8 | symbols_1.BuiltinType.String:
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126 | case symbols_1.BuiltinType.Number << 8 | symbols_1.BuiltinType.String:
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127 | case symbols_1.BuiltinType.String << 8 | symbols_1.BuiltinType.Any:
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128 | case symbols_1.BuiltinType.String << 8 | symbols_1.BuiltinType.Boolean:
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129 | case symbols_1.BuiltinType.String << 8 | symbols_1.BuiltinType.Number:
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130 | case symbols_1.BuiltinType.String << 8 | symbols_1.BuiltinType.String:
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131 | case symbols_1.BuiltinType.String << 8 | symbols_1.BuiltinType.Other:
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132 | case symbols_1.BuiltinType.Other << 8 | symbols_1.BuiltinType.String:
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133 | return this.query.getBuiltinType(symbols_1.BuiltinType.String);
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134 | case symbols_1.BuiltinType.Number << 8 | symbols_1.BuiltinType.Number:
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135 | return this.query.getBuiltinType(symbols_1.BuiltinType.Number);
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136 | case symbols_1.BuiltinType.Boolean << 8 | symbols_1.BuiltinType.Number:
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137 | case symbols_1.BuiltinType.Other << 8 | symbols_1.BuiltinType.Number:
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138 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(ast.left.span, diagnostic_messages_1.Diagnostic.expected_a_number_type));
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139 | return this.anyType;
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140 | case symbols_1.BuiltinType.Number << 8 | symbols_1.BuiltinType.Boolean:
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141 | case symbols_1.BuiltinType.Number << 8 | symbols_1.BuiltinType.Other:
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142 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(ast.right.span, diagnostic_messages_1.Diagnostic.expected_a_number_type));
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143 | return this.anyType;
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144 | default:
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145 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.expected_a_string_or_number_type));
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146 | return this.anyType;
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147 | }
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148 | case '>':
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149 | case '<':
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150 | case '<=':
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151 | case '>=':
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152 | case '==':
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153 | case '!=':
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154 | case '===':
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155 | case '!==':
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156 | if (!(leftKind & rightKind) &&
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157 | !((leftKind | rightKind) & (symbols_1.BuiltinType.Null | symbols_1.BuiltinType.Undefined))) {
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158 | // Two values are comparable only if
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159 | // - they have some type overlap, or
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160 | // - at least one is not defined
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161 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.expected_operands_of_comparable_types_or_any));
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162 | }
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163 | return this.query.getBuiltinType(symbols_1.BuiltinType.Boolean);
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164 | case '&&':
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165 | return rightType;
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166 | case '||':
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167 | return this.query.getTypeUnion(leftType, rightType);
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168 | }
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169 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.unrecognized_operator, ast.operation));
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170 | return this.anyType;
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171 | };
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172 | AstType.prototype.visitChain = function (ast) {
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173 | var e_1, _a;
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174 | try {
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175 | // If we are producing diagnostics, visit the children
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176 | for (var _b = tslib_1.__values(ast.expressions), _c = _b.next(); !_c.done; _c = _b.next()) {
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177 | var expr = _c.value;
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178 | expr.visit(this);
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179 | }
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180 | }
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181 | catch (e_1_1) { e_1 = { error: e_1_1 }; }
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182 | finally {
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183 | try {
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184 | if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
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185 | }
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186 | finally { if (e_1) throw e_1.error; }
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187 | }
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188 | // The type of a chain is always undefined.
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189 | return this.query.getBuiltinType(symbols_1.BuiltinType.Undefined);
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190 | };
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191 | AstType.prototype.visitConditional = function (ast) {
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192 | // The type of a conditional is the union of the true and false conditions.
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193 | ast.condition.visit(this);
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194 | ast.trueExp.visit(this);
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195 | ast.falseExp.visit(this);
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196 | return this.query.getTypeUnion(this.getType(ast.trueExp), this.getType(ast.falseExp));
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197 | };
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198 | AstType.prototype.visitFunctionCall = function (ast) {
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199 | var _this_1 = this;
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200 | // The type of a function call is the return type of the selected signature.
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201 | // The signature is selected based on the types of the arguments. Angular doesn't
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202 | // support contextual typing of arguments so this is simpler than TypeScript's
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203 | // version.
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204 | var args = ast.args.map(function (arg) { return _this_1.getType(arg); });
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205 | var target = this.getType(ast.target);
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206 | if (!target || !target.callable) {
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207 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.call_target_not_callable, this.sourceOf(ast.target), target.name));
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208 | return this.anyType;
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209 | }
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210 | var signature = target.selectSignature(args);
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211 | if (signature) {
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212 | return signature.result;
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213 | }
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214 | // TODO: Consider a better error message here. See `typescript_symbols#selectSignature` for more
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215 | // details.
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216 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.unable_to_resolve_compatible_call_signature));
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217 | return this.anyType;
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218 | };
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219 | AstType.prototype.visitImplicitReceiver = function (_ast) {
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220 | var _this = this;
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221 | // Return a pseudo-symbol for the implicit receiver.
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222 | // The members of the implicit receiver are what is defined by the
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223 | // scope passed into this class.
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224 | return {
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225 | name: '$implicit',
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226 | kind: 'component',
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227 | language: 'ng-template',
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228 | type: undefined,
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229 | container: undefined,
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230 | callable: false,
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231 | nullable: false,
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232 | public: true,
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233 | definition: undefined,
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234 | documentation: [],
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235 | members: function () {
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236 | return _this.scope;
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237 | },
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238 | signatures: function () {
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239 | return [];
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240 | },
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241 | selectSignature: function (_types) {
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242 | return undefined;
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243 | },
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244 | indexed: function (_argument) {
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245 | return undefined;
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246 | },
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247 | typeArguments: function () {
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248 | return undefined;
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249 | },
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250 | };
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251 | };
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252 | AstType.prototype.visitThisReceiver = function (_ast) {
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253 | return this.visitImplicitReceiver(_ast);
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254 | };
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255 | AstType.prototype.visitInterpolation = function (ast) {
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256 | var e_2, _a;
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257 | try {
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258 | // If we are producing diagnostics, visit the children.
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259 | for (var _b = tslib_1.__values(ast.expressions), _c = _b.next(); !_c.done; _c = _b.next()) {
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260 | var expr = _c.value;
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261 | expr.visit(this);
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262 | }
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263 | }
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264 | catch (e_2_1) { e_2 = { error: e_2_1 }; }
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265 | finally {
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266 | try {
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267 | if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
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268 | }
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269 | finally { if (e_2) throw e_2.error; }
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270 | }
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271 | return this.undefinedType;
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272 | };
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273 | AstType.prototype.visitKeyedRead = function (ast) {
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274 | var targetType = this.getType(ast.obj);
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275 | var keyType = this.getType(ast.key);
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276 | var result = targetType.indexed(keyType, ast.key instanceof compiler_1.LiteralPrimitive ? ast.key.value : undefined);
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277 | return result || this.anyType;
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278 | };
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279 | AstType.prototype.visitKeyedWrite = function (ast) {
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280 | // The write of a type is the type of the value being written.
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281 | return this.getType(ast.value);
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282 | };
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283 | AstType.prototype.visitLiteralArray = function (ast) {
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284 | var _a;
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285 | var _this_1 = this;
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286 | // A type literal is an array type of the union of the elements
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287 | return this.query.getArrayType((_a = this.query).getTypeUnion.apply(_a, tslib_1.__spread(ast.expressions.map(function (element) { return _this_1.getType(element); }))));
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288 | };
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289 | AstType.prototype.visitLiteralMap = function (ast) {
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290 | var e_3, _a;
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291 | try {
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292 | // If we are producing diagnostics, visit the children
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293 | for (var _b = tslib_1.__values(ast.values), _c = _b.next(); !_c.done; _c = _b.next()) {
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294 | var value = _c.value;
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295 | value.visit(this);
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296 | }
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297 | }
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298 | catch (e_3_1) { e_3 = { error: e_3_1 }; }
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299 | finally {
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300 | try {
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301 | if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
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302 | }
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303 | finally { if (e_3) throw e_3.error; }
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304 | }
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305 | // TODO: Return a composite type.
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306 | return this.anyType;
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307 | };
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308 | AstType.prototype.visitLiteralPrimitive = function (ast) {
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309 | // The type of a literal primitive depends on the value of the literal.
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310 | switch (ast.value) {
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311 | case true:
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312 | case false:
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313 | return this.query.getBuiltinType(symbols_1.BuiltinType.Boolean);
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314 | case null:
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315 | return this.query.getBuiltinType(symbols_1.BuiltinType.Null);
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316 | case undefined:
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317 | return this.query.getBuiltinType(symbols_1.BuiltinType.Undefined);
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318 | default:
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319 | switch (typeof ast.value) {
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320 | case 'string':
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321 | return this.query.getBuiltinType(symbols_1.BuiltinType.String);
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322 | case 'number':
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323 | return this.query.getBuiltinType(symbols_1.BuiltinType.Number);
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324 | default:
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325 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.unrecognized_primitive, typeof ast.value));
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326 | return this.anyType;
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327 | }
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328 | }
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329 | };
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330 | AstType.prototype.visitMethodCall = function (ast) {
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331 | return this.resolveMethodCall(this.getType(ast.receiver), ast);
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332 | };
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333 | AstType.prototype.visitPipe = function (ast) {
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334 | var _this_1 = this;
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335 | // The type of a pipe node is the return type of the pipe's transform method. The table returned
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336 | // by getPipes() is expected to contain symbols with the corresponding transform method type.
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337 | var pipe = this.query.getPipes().get(ast.name);
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338 | if (!pipe) {
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339 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.no_pipe_found, ast.name));
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340 | return this.anyType;
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341 | }
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342 | var expType = this.getType(ast.exp);
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343 | var signature = pipe.selectSignature([expType].concat(ast.args.map(function (arg) { return _this_1.getType(arg); })));
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344 | if (!signature) {
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345 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.unable_to_resolve_signature, ast.name));
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346 | return this.anyType;
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347 | }
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348 | return signature.result;
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349 | };
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350 | AstType.prototype.visitPrefixNot = function (ast) {
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351 | // If we are producing diagnostics, visit the children
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352 | ast.expression.visit(this);
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353 | // The type of a prefix ! is always boolean.
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354 | return this.query.getBuiltinType(symbols_1.BuiltinType.Boolean);
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355 | };
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356 | AstType.prototype.visitNonNullAssert = function (ast) {
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357 | var expressionType = this.getType(ast.expression);
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358 | return this.query.getNonNullableType(expressionType);
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359 | };
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360 | AstType.prototype.visitPropertyRead = function (ast) {
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361 | return this.resolvePropertyRead(this.getType(ast.receiver), ast);
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362 | };
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363 | AstType.prototype.visitPropertyWrite = function (ast) {
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364 | // The type of a write is the type of the value being written.
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365 | return this.getType(ast.value);
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366 | };
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367 | AstType.prototype.visitQuote = function (_ast) {
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368 | // The type of a quoted expression is any.
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369 | return this.query.getBuiltinType(symbols_1.BuiltinType.Any);
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370 | };
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371 | AstType.prototype.visitSafeMethodCall = function (ast) {
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372 | return this.resolveMethodCall(this.query.getNonNullableType(this.getType(ast.receiver)), ast);
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373 | };
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374 | AstType.prototype.visitSafePropertyRead = function (ast) {
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375 | return this.resolvePropertyRead(this.query.getNonNullableType(this.getType(ast.receiver)), ast);
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376 | };
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377 | /**
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378 | * Gets the source of an expession AST.
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379 | * The AST's sourceSpan is relative to the start of the template source code, which is contained
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380 | * at this.source.
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381 | */
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382 | AstType.prototype.sourceOf = function (ast) {
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383 | return this.source.substring(ast.sourceSpan.start, ast.sourceSpan.end);
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384 | };
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385 | Object.defineProperty(AstType.prototype, "anyType", {
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386 | get: function () {
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387 | var result = this._anyType;
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388 | if (!result) {
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389 | result = this._anyType = this.query.getBuiltinType(symbols_1.BuiltinType.Any);
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390 | }
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391 | return result;
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392 | },
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393 | enumerable: false,
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394 | configurable: true
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395 | });
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396 | Object.defineProperty(AstType.prototype, "undefinedType", {
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397 | get: function () {
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398 | var result = this._undefinedType;
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399 | if (!result) {
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400 | result = this._undefinedType = this.query.getBuiltinType(symbols_1.BuiltinType.Undefined);
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401 | }
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402 | return result;
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403 | },
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404 | enumerable: false,
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405 | configurable: true
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406 | });
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407 | AstType.prototype.resolveMethodCall = function (receiverType, ast) {
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408 | var _this_1 = this;
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409 | if (this.isAny(receiverType)) {
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410 | return this.anyType;
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411 | }
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412 | var methodType = this.resolvePropertyRead(receiverType, ast);
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413 | if (!methodType) {
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414 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.could_not_resolve_type, ast.name));
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415 | return this.anyType;
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416 | }
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417 | if (this.isAny(methodType)) {
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418 | return this.anyType;
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419 | }
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420 | if (!methodType.callable) {
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421 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.identifier_not_callable, ast.name));
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422 | return this.anyType;
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423 | }
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424 | var signature = methodType.selectSignature(ast.args.map(function (arg) { return _this_1.getType(arg); }));
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425 | if (!signature) {
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426 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.unable_to_resolve_signature, ast.name));
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427 | return this.anyType;
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428 | }
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429 | return signature.result;
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430 | };
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431 | AstType.prototype.resolvePropertyRead = function (receiverType, ast) {
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432 | if (this.isAny(receiverType)) {
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433 | return this.anyType;
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434 | }
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435 | // The type of a property read is the seelcted member's type.
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436 | var member = receiverType.members().get(ast.name);
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437 | if (!member) {
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438 | if (receiverType.name === '$implicit') {
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439 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.identifier_not_defined_in_app_context, ast.name));
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440 | }
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441 | else if (receiverType.nullable && ast.receiver instanceof compiler_1.PropertyRead) {
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442 | var receiver = ast.receiver.name;
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443 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.identifier_possibly_undefined, receiver, receiver + "?." + ast.name, receiver + "!." + ast.name));
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444 | }
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445 | else {
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446 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.identifier_not_defined_on_receiver, ast.name, receiverType.name));
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447 | }
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448 | return this.anyType;
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449 | }
|
450 | if (!member.public) {
|
451 | var container = receiverType.name === '$implicit' ? 'the component' : "'" + receiverType.name + "'";
|
452 | this.diagnostics.push(diagnostic_messages_1.createDiagnostic(refinedSpan(ast), diagnostic_messages_1.Diagnostic.identifier_is_private, ast.name, container));
|
453 | }
|
454 | return member.type;
|
455 | };
|
456 | AstType.prototype.isAny = function (symbol) {
|
457 | return !symbol || this.query.getTypeKind(symbol) === symbols_1.BuiltinType.Any ||
|
458 | (!!symbol.type && this.isAny(symbol.type));
|
459 | };
|
460 | return AstType;
|
461 | }());
|
462 | exports.AstType = AstType;
|
463 | function refinedSpan(ast) {
|
464 | // nameSpan is an absolute span, but the spans returned by the expression visitor are expected to
|
465 | // be relative to the start of the expression.
|
466 | // TODO: migrate to only using absolute spans
|
467 | var absoluteOffset = ast.sourceSpan.start - ast.span.start;
|
468 | if (ast instanceof compiler_1.ASTWithName) {
|
469 | return utils_1.offsetSpan(ast.nameSpan, -absoluteOffset);
|
470 | }
|
471 | return utils_1.offsetSpan(ast.sourceSpan, -absoluteOffset);
|
472 | }
|
473 | });
|
474 | //# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {AST, AstVisitor, ASTWithName, Binary, BindingPipe, Chain, Conditional, FunctionCall, ImplicitReceiver, Interpolation, KeyedRead, KeyedWrite, LiteralArray, LiteralMap, LiteralPrimitive, MethodCall, NonNullAssert, PrefixNot, PropertyRead, PropertyWrite, Quote, SafeMethodCall, SafePropertyRead, ThisReceiver, Unary} from '@angular/compiler';\n\nimport {createDiagnostic, Diagnostic} from './diagnostic_messages';\nimport {BuiltinType, Signature, Symbol, SymbolQuery, SymbolTable} from './symbols';\nimport * as ng from './types';\nimport {offsetSpan} from './utils';\n\ninterface ExpressionDiagnosticsContext {\n  inEvent?: boolean;\n}\n\n// AstType calculatetype of the ast given AST element.\nexport class AstType implements AstVisitor {\n  private readonly diagnostics: ng.Diagnostic[] = [];\n\n  constructor(\n      private scope: SymbolTable, private query: SymbolQuery,\n      private context: ExpressionDiagnosticsContext, private source: string) {}\n\n  getType(ast: AST): Symbol {\n    return ast.visit(this);\n  }\n\n  getDiagnostics(ast: AST): ng.Diagnostic[] {\n    const type: Symbol = ast.visit(this);\n    if (this.context.inEvent && type.callable) {\n      this.diagnostics.push(\n          createDiagnostic(refinedSpan(ast), Diagnostic.callable_expression_expected_method_call));\n    }\n    return this.diagnostics;\n  }\n\n  visitUnary(ast: Unary): Symbol {\n    // Visit the child to produce diagnostics.\n    ast.expr.visit(this);\n\n    // The unary plus and minus operator are always of type number.\n    // https://github.com/Microsoft/TypeScript/blob/v1.8.10/doc/spec.md#4.18\n    switch (ast.operator) {\n      case '-':\n      case '+':\n        return this.query.getBuiltinType(BuiltinType.Number);\n    }\n\n    this.diagnostics.push(\n        createDiagnostic(refinedSpan(ast), Diagnostic.unrecognized_operator, ast.operator));\n    return this.anyType;\n  }\n\n  visitBinary(ast: Binary): Symbol {\n    const getType = (ast: AST, operation: string): Symbol => {\n      const type = this.getType(ast);\n      if (type.nullable) {\n        switch (operation) {\n          case '&&':\n          case '||':\n          case '==':\n          case '!=':\n          case '===':\n          case '!==':\n            // Nullable allowed.\n            break;\n          default:\n            this.diagnostics.push(\n                createDiagnostic(refinedSpan(ast), Diagnostic.expression_might_be_null));\n            break;\n        }\n      }\n      return type;\n    };\n\n    const leftType = getType(ast.left, ast.operation);\n    const rightType = getType(ast.right, ast.operation);\n    const leftKind = this.query.getTypeKind(leftType);\n    const rightKind = this.query.getTypeKind(rightType);\n\n    // The following swtich implements operator typing similar to the\n    // type production tables in the TypeScript specification.\n    // https://github.com/Microsoft/TypeScript/blob/v1.8.10/doc/spec.md#4.19\n    const operKind = leftKind << 8 | rightKind;\n    switch (ast.operation) {\n      case '*':\n      case '/':\n      case '%':\n      case '-':\n      case '<<':\n      case '>>':\n      case '>>>':\n      case '&':\n      case '^':\n      case '|':\n        switch (operKind) {\n          case BuiltinType.Any << 8 | BuiltinType.Any:\n          case BuiltinType.Number << 8 | BuiltinType.Any:\n          case BuiltinType.Any << 8 | BuiltinType.Number:\n          case BuiltinType.Number << 8 | BuiltinType.Number:\n            return this.query.getBuiltinType(BuiltinType.Number);\n          default:\n            let errorAst = ast.left;\n            switch (leftKind) {\n              case BuiltinType.Any:\n              case BuiltinType.Number:\n                errorAst = ast.right;\n                break;\n            }\n            this.diagnostics.push(\n                createDiagnostic(errorAst.span, Diagnostic.expected_a_number_type));\n            return this.anyType;\n        }\n      case '+':\n        switch (operKind) {\n          case BuiltinType.Any << 8 | BuiltinType.Any:\n          case BuiltinType.Any << 8 | BuiltinType.Boolean:\n          case BuiltinType.Any << 8 | BuiltinType.Number:\n          case BuiltinType.Any << 8 | BuiltinType.Other:\n          case BuiltinType.Boolean << 8 | BuiltinType.Any:\n          case BuiltinType.Number << 8 | BuiltinType.Any:\n          case BuiltinType.Other << 8 | BuiltinType.Any:\n            return this.anyType;\n          case BuiltinType.Any << 8 | BuiltinType.String:\n          case BuiltinType.Boolean << 8 | BuiltinType.String:\n          case BuiltinType.Number << 8 | BuiltinType.String:\n          case BuiltinType.String << 8 | BuiltinType.Any:\n          case BuiltinType.String << 8 | BuiltinType.Boolean:\n          case BuiltinType.String << 8 | BuiltinType.Number:\n          case BuiltinType.String << 8 | BuiltinType.String:\n          case BuiltinType.String << 8 | BuiltinType.Other:\n          case BuiltinType.Other << 8 | BuiltinType.String:\n            return this.query.getBuiltinType(BuiltinType.String);\n          case BuiltinType.Number << 8 | BuiltinType.Number:\n            return this.query.getBuiltinType(BuiltinType.Number);\n          case BuiltinType.Boolean << 8 | BuiltinType.Number:\n          case BuiltinType.Other << 8 | BuiltinType.Number:\n            this.diagnostics.push(\n                createDiagnostic(ast.left.span, Diagnostic.expected_a_number_type));\n            return this.anyType;\n          case BuiltinType.Number << 8 | BuiltinType.Boolean:\n          case BuiltinType.Number << 8 | BuiltinType.Other:\n            this.diagnostics.push(\n                createDiagnostic(ast.right.span, Diagnostic.expected_a_number_type));\n            return this.anyType;\n          default:\n            this.diagnostics.push(\n                createDiagnostic(refinedSpan(ast), Diagnostic.expected_a_string_or_number_type));\n            return this.anyType;\n        }\n      case '>':\n      case '<':\n      case '<=':\n      case '>=':\n      case '==':\n      case '!=':\n      case '===':\n      case '!==':\n        if (!(leftKind & rightKind) &&\n            !((leftKind | rightKind) & (BuiltinType.Null | BuiltinType.Undefined))) {\n          // Two values are comparable only if\n          //   - they have some type overlap, or\n          //   - at least one is not defined\n          this.diagnostics.push(createDiagnostic(\n              refinedSpan(ast), Diagnostic.expected_operands_of_comparable_types_or_any));\n        }\n        return this.query.getBuiltinType(BuiltinType.Boolean);\n      case '&&':\n        return rightType;\n      case '||':\n        return this.query.getTypeUnion(leftType, rightType);\n    }\n\n    this.diagnostics.push(\n        createDiagnostic(refinedSpan(ast), Diagnostic.unrecognized_operator, ast.operation));\n    return this.anyType;\n  }\n\n  visitChain(ast: Chain) {\n    // If we are producing diagnostics, visit the children\n    for (const expr of ast.expressions) {\n      expr.visit(this);\n    }\n    // The type of a chain is always undefined.\n    return this.query.getBuiltinType(BuiltinType.Undefined);\n  }\n\n  visitConditional(ast: Conditional) {\n    // The type of a conditional is the union of the true and false conditions.\n    ast.condition.visit(this);\n    ast.trueExp.visit(this);\n    ast.falseExp.visit(this);\n    return this.query.getTypeUnion(this.getType(ast.trueExp), this.getType(ast.falseExp));\n  }\n\n  visitFunctionCall(ast: FunctionCall) {\n    // The type of a function call is the return type of the selected signature.\n    // The signature is selected based on the types of the arguments. Angular doesn't\n    // support contextual typing of arguments so this is simpler than TypeScript's\n    // version.\n    const args = ast.args.map(arg => this.getType(arg));\n    const target = this.getType(ast.target!);\n    if (!target || !target.callable) {\n      this.diagnostics.push(createDiagnostic(\n          refinedSpan(ast), Diagnostic.call_target_not_callable, this.sourceOf(ast.target!),\n          target.name));\n      return this.anyType;\n    }\n    const signature = target.selectSignature(args);\n    if (signature) {\n      return signature.result;\n    }\n    // TODO: Consider a better error message here. See `typescript_symbols#selectSignature` for more\n    // details.\n    this.diagnostics.push(\n        createDiagnostic(refinedSpan(ast), Diagnostic.unable_to_resolve_compatible_call_signature));\n    return this.anyType;\n  }\n\n  visitImplicitReceiver(_ast: ImplicitReceiver): Symbol {\n    const _this = this;\n    // Return a pseudo-symbol for the implicit receiver.\n    // The members of the implicit receiver are what is defined by the\n    // scope passed into this class.\n    return {\n      name: '$implicit',\n      kind: 'component',\n      language: 'ng-template',\n      type: undefined,\n      container: undefined,\n      callable: false,\n      nullable: false,\n      public: true,\n      definition: undefined,\n      documentation: [],\n      members(): SymbolTable {\n        return _this.scope;\n      },\n      signatures(): Signature[] {\n        return [];\n      },\n      selectSignature(_types): Signature |\n          undefined {\n            return undefined;\n          },\n      indexed(_argument): Symbol |\n          undefined {\n            return undefined;\n          },\n      typeArguments(): Symbol[] |\n          undefined {\n            return undefined;\n          },\n    };\n  }\n\n  visitThisReceiver(_ast: ThisReceiver): Symbol {\n    return this.visitImplicitReceiver(_ast);\n  }\n\n  visitInterpolation(ast: Interpolation): Symbol {\n    // If we are producing diagnostics, visit the children.\n    for (const expr of ast.expressions) {\n      expr.visit(this);\n    }\n    return this.undefinedType;\n  }\n\n  visitKeyedRead(ast: KeyedRead): Symbol {\n    const targetType = this.getType(ast.obj);\n    const keyType = this.getType(ast.key);\n    const result = targetType.indexed(\n        keyType, ast.key instanceof LiteralPrimitive ? ast.key.value : undefined);\n    return result || this.anyType;\n  }\n\n  visitKeyedWrite(ast: KeyedWrite): Symbol {\n    // The write of a type is the type of the value being written.\n    return this.getType(ast.value);\n  }\n\n  visitLiteralArray(ast: LiteralArray): Symbol {\n    // A type literal is an array type of the union of the elements\n    return this.query.getArrayType(\n        this.query.getTypeUnion(...ast.expressions.map(element => this.getType(element))));\n  }\n\n  visitLiteralMap(ast: LiteralMap): Symbol {\n    // If we are producing diagnostics, visit the children\n    for (const value of ast.values) {\n      value.visit(this);\n    }\n    // TODO: Return a composite type.\n    return this.anyType;\n  }\n\n  visitLiteralPrimitive(ast: LiteralPrimitive) {\n    // The type of a literal primitive depends on the value of the literal.\n    switch (ast.value) {\n      case true:\n      case false:\n        return this.query.getBuiltinType(BuiltinType.Boolean);\n      case null:\n        return this.query.getBuiltinType(BuiltinType.Null);\n      case undefined:\n        return this.query.getBuiltinType(BuiltinType.Undefined);\n      default:\n        switch (typeof ast.value) {\n          case 'string':\n            return this.query.getBuiltinType(BuiltinType.String);\n          case 'number':\n            return this.query.getBuiltinType(BuiltinType.Number);\n          default:\n            this.diagnostics.push(createDiagnostic(\n                refinedSpan(ast), Diagnostic.unrecognized_primitive, typeof ast.value));\n            return this.anyType;\n        }\n    }\n  }\n\n  visitMethodCall(ast: MethodCall) {\n    return this.resolveMethodCall(this.getType(ast.receiver), ast);\n  }\n\n  visitPipe(ast: BindingPipe) {\n    // The type of a pipe node is the return type of the pipe's transform method. The table returned\n    // by getPipes() is expected to contain symbols with the corresponding transform method type.\n    const pipe = this.query.getPipes().get(ast.name);\n    if (!pipe) {\n      this.diagnostics.push(createDiagnostic(refinedSpan(ast), Diagnostic.no_pipe_found, ast.name));\n      return this.anyType;\n    }\n    const expType = this.getType(ast.exp);\n    const signature =\n        pipe.selectSignature([expType].concat(ast.args.map(arg => this.getType(arg))));\n    if (!signature) {\n      this.diagnostics.push(\n          createDiagnostic(refinedSpan(ast), Diagnostic.unable_to_resolve_signature, ast.name));\n      return this.anyType;\n    }\n    return signature.result;\n  }\n\n  visitPrefixNot(ast: PrefixNot) {\n    // If we are producing diagnostics, visit the children\n    ast.expression.visit(this);\n    // The type of a prefix ! is always boolean.\n    return this.query.getBuiltinType(BuiltinType.Boolean);\n  }\n\n  visitNonNullAssert(ast: NonNullAssert) {\n    const expressionType = this.getType(ast.expression);\n    return this.query.getNonNullableType(expressionType);\n  }\n\n  visitPropertyRead(ast: PropertyRead) {\n    return this.resolvePropertyRead(this.getType(ast.receiver), ast);\n  }\n\n  visitPropertyWrite(ast: PropertyWrite) {\n    // The type of a write is the type of the value being written.\n    return this.getType(ast.value);\n  }\n\n  visitQuote(_ast: Quote) {\n    // The type of a quoted expression is any.\n    return this.query.getBuiltinType(BuiltinType.Any);\n  }\n\n  visitSafeMethodCall(ast: SafeMethodCall) {\n    return this.resolveMethodCall(this.query.getNonNullableType(this.getType(ast.receiver)), ast);\n  }\n\n  visitSafePropertyRead(ast: SafePropertyRead) {\n    return this.resolvePropertyRead(this.query.getNonNullableType(this.getType(ast.receiver)), ast);\n  }\n\n  /**\n   * Gets the source of an expession AST.\n   * The AST's sourceSpan is relative to the start of the template source code, which is contained\n   * at this.source.\n   */\n  private sourceOf(ast: AST): string {\n    return this.source.substring(ast.sourceSpan.start, ast.sourceSpan.end);\n  }\n\n  private _anyType: Symbol|undefined;\n  private get anyType(): Symbol {\n    let result = this._anyType;\n    if (!result) {\n      result = this._anyType = this.query.getBuiltinType(BuiltinType.Any);\n    }\n    return result;\n  }\n\n  private _undefinedType: Symbol|undefined;\n  private get undefinedType(): Symbol {\n    let result = this._undefinedType;\n    if (!result) {\n      result = this._undefinedType = this.query.getBuiltinType(BuiltinType.Undefined);\n    }\n    return result;\n  }\n\n  private resolveMethodCall(receiverType: Symbol, ast: SafeMethodCall|MethodCall) {\n    if (this.isAny(receiverType)) {\n      return this.anyType;\n    }\n    const methodType = this.resolvePropertyRead(receiverType, ast);\n    if (!methodType) {\n      this.diagnostics.push(\n          createDiagnostic(refinedSpan(ast), Diagnostic.could_not_resolve_type, ast.name));\n      return this.anyType;\n    }\n    if (this.isAny(methodType)) {\n      return this.anyType;\n    }\n    if (!methodType.callable) {\n      this.diagnostics.push(\n          createDiagnostic(refinedSpan(ast), Diagnostic.identifier_not_callable, ast.name));\n      return this.anyType;\n    }\n    const signature = methodType.selectSignature(ast.args.map(arg => this.getType(arg)));\n    if (!signature) {\n      this.diagnostics.push(\n          createDiagnostic(refinedSpan(ast), Diagnostic.unable_to_resolve_signature, ast.name));\n      return this.anyType;\n    }\n    return signature.result;\n  }\n\n  private resolvePropertyRead(receiverType: Symbol, ast: SafePropertyRead|PropertyRead) {\n    if (this.isAny(receiverType)) {\n      return this.anyType;\n    }\n    // The type of a property read is the seelcted member's type.\n    const member = receiverType.members().get(ast.name);\n    if (!member) {\n      if (receiverType.name === '$implicit') {\n        this.diagnostics.push(createDiagnostic(\n            refinedSpan(ast), Diagnostic.identifier_not_defined_in_app_context, ast.name));\n      } else if (receiverType.nullable && ast.receiver instanceof PropertyRead) {\n        const receiver = ast.receiver.name;\n        this.diagnostics.push(createDiagnostic(\n            refinedSpan(ast), Diagnostic.identifier_possibly_undefined, receiver,\n            `${receiver}?.${ast.name}`, `${receiver}!.${ast.name}`));\n      } else {\n        this.diagnostics.push(createDiagnostic(\n            refinedSpan(ast), Diagnostic.identifier_not_defined_on_receiver, ast.name,\n            receiverType.name));\n      }\n      return this.anyType;\n    }\n    if (!member.public) {\n      const container =\n          receiverType.name === '$implicit' ? 'the component' : `'${receiverType.name}'`;\n      this.diagnostics.push(createDiagnostic(\n          refinedSpan(ast), Diagnostic.identifier_is_private, ast.name, container));\n    }\n    return member.type;\n  }\n\n  private isAny(symbol: Symbol): boolean {\n    return !symbol || this.query.getTypeKind(symbol) === BuiltinType.Any ||\n        (!!symbol.type && this.isAny(symbol.type));\n  }\n}\n\nfunction refinedSpan(ast: AST): ng.Span {\n  // nameSpan is an absolute span, but the spans returned by the expression visitor are expected to\n  // be relative to the start of the expression.\n  // TODO: migrate to only using absolute spans\n  const absoluteOffset = ast.sourceSpan.start - ast.span.start;\n  if (ast instanceof ASTWithName) {\n    return offsetSpan(ast.nameSpan, -absoluteOffset);\n  }\n  return offsetSpan(ast.sourceSpan, -absoluteOffset);\n}\n"]} |
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