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| 1 | +import * as ts from "typescript"; |
| 2 | +import * as lua from "../../../LuaAST"; |
| 3 | +import * as extensions from "../../utils/language-extensions"; |
| 4 | +import { TransformationContext } from "../../context"; |
| 5 | +import { transformAssignmentLeftHandSideExpression } from "../binary-expression/assignments"; |
| 6 | +import { transformIdentifier } from "../identifier"; |
| 7 | +import { transformArguments } from "../call"; |
| 8 | +import { getDependenciesOfSymbol, createExportedIdentifier } from "../../utils/export"; |
| 9 | +import { createLocalOrExportedOrGlobalDeclaration } from "../../utils/lua-ast"; |
| 10 | +import { |
| 11 | + invalidMultiTypeArrayBindingPatternElementInitializer, |
| 12 | + invalidMultiTypeArrayLiteralElementInitializer, |
| 13 | + invalidMultiTypeToEmptyPatternOrArrayLiteral, |
| 14 | + invalidMultiTypeToNonArrayBindingPattern, |
| 15 | + invalidMultiTypeToNonArrayLiteral, |
| 16 | + unsupportedMultiFunctionAssignment, |
| 17 | + invalidMultiFunctionUse, |
| 18 | +} from "../../utils/diagnostics"; |
| 19 | +import { assert } from "../../../utils"; |
| 20 | + |
| 21 | +const isMultiFunctionDeclaration = (declaration: ts.Declaration): boolean => |
| 22 | + extensions.getExtensionKind(declaration) === extensions.ExtensionKind.MultiFunction; |
| 23 | + |
| 24 | +const isMultiTypeDeclaration = (declaration: ts.Declaration): boolean => |
| 25 | + extensions.getExtensionKind(declaration) === extensions.ExtensionKind.MultiType; |
| 26 | + |
| 27 | +export function isMultiFunction(context: TransformationContext, expression: ts.CallExpression): boolean { |
| 28 | + const type = context.checker.getTypeAtLocation(expression.expression); |
| 29 | + return type.symbol?.declarations?.some(isMultiFunctionDeclaration) ?? false; |
| 30 | +} |
| 31 | + |
| 32 | +export function returnsMultiType(context: TransformationContext, node: ts.CallExpression): boolean { |
| 33 | + const signature = context.checker.getResolvedSignature(node); |
| 34 | + return signature?.getReturnType().aliasSymbol?.declarations?.some(isMultiTypeDeclaration) ?? false; |
| 35 | +} |
| 36 | + |
| 37 | +export function isMultiFunctionNode(context: TransformationContext, node: ts.Node): boolean { |
| 38 | + const type = context.checker.getTypeAtLocation(node); |
| 39 | + return type.symbol?.declarations?.some(isMultiFunctionDeclaration) ?? false; |
| 40 | +} |
| 41 | + |
| 42 | +export function transformMultiCallExpressionToReturnStatement( |
| 43 | + context: TransformationContext, |
| 44 | + expression: ts.Expression |
| 45 | +): lua.Statement { |
| 46 | + assert(ts.isCallExpression(expression)); |
| 47 | + |
| 48 | + const expressions = transformArguments(context, expression.arguments); |
| 49 | + return lua.createReturnStatement(expressions, expression); |
| 50 | +} |
| 51 | + |
| 52 | +export function transformMultiReturnStatement( |
| 53 | + context: TransformationContext, |
| 54 | + statement: ts.ReturnStatement |
| 55 | +): lua.Statement { |
| 56 | + assert(statement.expression); |
| 57 | + |
| 58 | + return transformMultiCallExpressionToReturnStatement(context, statement.expression); |
| 59 | +} |
| 60 | + |
| 61 | +function transformMultiFunctionArguments( |
| 62 | + context: TransformationContext, |
| 63 | + expression: ts.CallExpression |
| 64 | +): lua.Expression[] | lua.Expression { |
| 65 | + if (!isMultiFunction(context, expression)) { |
| 66 | + return context.transformExpression(expression); |
| 67 | + } |
| 68 | + |
| 69 | + if (expression.arguments.length === 0) { |
| 70 | + return lua.createNilLiteral(expression); |
| 71 | + } |
| 72 | + |
| 73 | + return expression.arguments.map(e => context.transformExpression(e)); |
| 74 | +} |
| 75 | + |
| 76 | +export function transformMultiVariableDeclaration( |
| 77 | + context: TransformationContext, |
| 78 | + declaration: ts.VariableDeclaration |
| 79 | +): lua.Statement[] { |
| 80 | + assert(declaration.initializer); |
| 81 | + assert(ts.isCallExpression(declaration.initializer)); |
| 82 | + |
| 83 | + if (!ts.isArrayBindingPattern(declaration.name)) { |
| 84 | + context.diagnostics.push(invalidMultiTypeToNonArrayBindingPattern(declaration.name)); |
| 85 | + return []; |
| 86 | + } |
| 87 | + |
| 88 | + if (declaration.name.elements.length < 1) { |
| 89 | + context.diagnostics.push(invalidMultiTypeToEmptyPatternOrArrayLiteral(declaration.name)); |
| 90 | + return []; |
| 91 | + } |
| 92 | + |
| 93 | + if (declaration.name.elements.some(e => ts.isBindingElement(e) && e.initializer)) { |
| 94 | + context.diagnostics.push(invalidMultiTypeArrayBindingPatternElementInitializer(declaration.name)); |
| 95 | + return []; |
| 96 | + } |
| 97 | + |
| 98 | + if (isMultiFunction(context, declaration.initializer)) { |
| 99 | + context.diagnostics.push(invalidMultiFunctionUse(declaration.initializer)); |
| 100 | + return []; |
| 101 | + } |
| 102 | + |
| 103 | + const leftIdentifiers: lua.Identifier[] = []; |
| 104 | + |
| 105 | + for (const element of declaration.name.elements) { |
| 106 | + if (ts.isBindingElement(element)) { |
| 107 | + if (ts.isIdentifier(element.name)) { |
| 108 | + leftIdentifiers.push(transformIdentifier(context, element.name)); |
| 109 | + } else { |
| 110 | + context.diagnostics.push(unsupportedMultiFunctionAssignment(element)); |
| 111 | + } |
| 112 | + } else if (ts.isOmittedExpression(element)) { |
| 113 | + leftIdentifiers.push(lua.createAnonymousIdentifier(element)); |
| 114 | + } |
| 115 | + } |
| 116 | + |
| 117 | + const rightExpressions = transformMultiFunctionArguments(context, declaration.initializer); |
| 118 | + return createLocalOrExportedOrGlobalDeclaration(context, leftIdentifiers, rightExpressions, declaration); |
| 119 | +} |
| 120 | + |
| 121 | +export function transformMultiDestructuringAssignmentStatement( |
| 122 | + context: TransformationContext, |
| 123 | + statement: ts.ExpressionStatement |
| 124 | +): lua.Statement[] | undefined { |
| 125 | + assert(ts.isBinaryExpression(statement.expression)); |
| 126 | + assert(ts.isCallExpression(statement.expression.right)); |
| 127 | + |
| 128 | + if (!ts.isArrayLiteralExpression(statement.expression.left)) { |
| 129 | + context.diagnostics.push(invalidMultiTypeToNonArrayLiteral(statement.expression.left)); |
| 130 | + return []; |
| 131 | + } |
| 132 | + |
| 133 | + if (statement.expression.left.elements.some(ts.isBinaryExpression)) { |
| 134 | + context.diagnostics.push(invalidMultiTypeArrayLiteralElementInitializer(statement.expression.left)); |
| 135 | + return []; |
| 136 | + } |
| 137 | + |
| 138 | + if (statement.expression.left.elements.length < 1) { |
| 139 | + context.diagnostics.push(invalidMultiTypeToEmptyPatternOrArrayLiteral(statement.expression.left)); |
| 140 | + return []; |
| 141 | + } |
| 142 | + |
| 143 | + if (isMultiFunction(context, statement.expression.right)) { |
| 144 | + context.diagnostics.push(invalidMultiFunctionUse(statement.expression.right)); |
| 145 | + return []; |
| 146 | + } |
| 147 | + |
| 148 | + const transformLeft = (expression: ts.Expression): lua.AssignmentLeftHandSideExpression => |
| 149 | + ts.isOmittedExpression(expression) |
| 150 | + ? lua.createAnonymousIdentifier(expression) |
| 151 | + : transformAssignmentLeftHandSideExpression(context, expression); |
| 152 | + |
| 153 | + const leftIdentifiers = statement.expression.left.elements.map(transformLeft); |
| 154 | + |
| 155 | + const rightExpressions = transformMultiFunctionArguments(context, statement.expression.right); |
| 156 | + |
| 157 | + const trailingStatements = statement.expression.left.elements.flatMap(expression => { |
| 158 | + const symbol = context.checker.getSymbolAtLocation(expression); |
| 159 | + const dependentSymbols = symbol ? getDependenciesOfSymbol(context, symbol) : []; |
| 160 | + return dependentSymbols.map(symbol => { |
| 161 | + const identifierToAssign = createExportedIdentifier(context, lua.createIdentifier(symbol.name)); |
| 162 | + return lua.createAssignmentStatement(identifierToAssign, transformLeft(expression)); |
| 163 | + }); |
| 164 | + }); |
| 165 | + |
| 166 | + return [lua.createAssignmentStatement(leftIdentifiers, rightExpressions, statement), ...trailingStatements]; |
| 167 | +} |
| 168 | + |
| 169 | +export function findMultiAssignmentViolations( |
| 170 | + context: TransformationContext, |
| 171 | + node: ts.ObjectLiteralExpression |
| 172 | +): ts.Node[] { |
| 173 | + const result: ts.Node[] = []; |
| 174 | + |
| 175 | + for (const element of node.properties) { |
| 176 | + if (!ts.isShorthandPropertyAssignment(element)) continue; |
| 177 | + const valueSymbol = context.checker.getShorthandAssignmentValueSymbol(element); |
| 178 | + if (valueSymbol) { |
| 179 | + const declaration = valueSymbol.valueDeclaration; |
| 180 | + if (declaration && isMultiFunctionDeclaration(declaration)) { |
| 181 | + context.diagnostics.push(invalidMultiFunctionUse(element)); |
| 182 | + result.push(element); |
| 183 | + } |
| 184 | + } |
| 185 | + } |
| 186 | + |
| 187 | + return result; |
| 188 | +} |
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