// buildMappingLiteralExpression builds the CodeDOM for a mapping literal expression.
func (db *domBuilder) buildMappingLiteralExpression(node compilergraph.GraphNode) codedom.Expression {
mappingScope, _ := db.scopegraph.GetScope(node)
mappingType := mappingScope.ResolvedTypeRef(db.scopegraph.TypeGraph())
eit := node.StartQuery().
Out(parser.NodeMappingLiteralExpressionEntryRef).
BuildNodeIterator()
var entries = make([]codedom.ObjectLiteralEntryNode, 0)
for eit.Next() {
entryNode := eit.Node()
// The key expression must be a string when produced. We either reference it directly (if a string)
// or call .String() (if a Stringable).
keyNode := entryNode.GetNode(parser.NodeMappingLiteralExpressionEntryKey)
keyScope, _ := db.scopegraph.GetScope(keyNode)
keyType := keyScope.ResolvedTypeRef(db.scopegraph.TypeGraph())
var keyExpr = db.buildExpression(keyNode)
if !keyType.HasReferredType(db.scopegraph.TypeGraph().StringType()) {
stringMethod, _ := keyType.ResolveMember("String", typegraph.MemberResolutionInstance)
keyExpr = codedom.MemberCall(
codedom.MemberReference(db.buildExpression(keyNode), stringMethod, node),
stringMethod,
[]codedom.Expression{},
keyNode)
}
// Get the expression for the value.
valueExpr := db.getExpression(entryNode, parser.NodeMappingLiteralExpressionEntryValue)
// Build an object literal expression with the (native version of the) key string and the
// created value.
entryExpr := codedom.ObjectLiteralEntryNode{
codedom.NominalUnwrapping(keyExpr, db.scopegraph.TypeGraph().StringTypeReference(), keyNode),
valueExpr,
entryNode,
}
entries = append(entries, entryExpr)
}
if len(entries) == 0 {
// Empty mapping. Call the Empty() constructor directly.
constructor, _ := mappingType.ResolveMember("Empty", typegraph.MemberResolutionStatic)
return codedom.MemberCall(
codedom.MemberReference(codedom.TypeLiteral(mappingType, node), constructor, node),
constructor,
[]codedom.Expression{},
node)
}
constructor, _ := mappingType.ResolveMember("overObject", typegraph.MemberResolutionStatic)
return codedom.MemberCall(
codedom.MemberReference(codedom.TypeLiteral(mappingType, node), constructor, node),
constructor,
[]codedom.Expression{codedom.ObjectLiteral(entries, node)},
node)
}
// buildMapExpression builds the CodeDOM for a map expression.
func (db *domBuilder) buildMapExpression(node compilergraph.GraphNode) codedom.Expression {
mapScope, _ := db.scopegraph.GetScope(node)
mapType := mapScope.ResolvedTypeRef(db.scopegraph.TypeGraph())
eit := node.StartQuery().
Out(parser.NodeMapExpressionChildEntry).
BuildNodeIterator()
var keyExprs = make([]codedom.Expression, 0)
var valueExprs = make([]codedom.Expression, 0)
for eit.Next() {
entryNode := eit.Node()
keyExprs = append(keyExprs, db.getExpression(entryNode, parser.NodeMapExpressionEntryKey))
valueExprs = append(valueExprs, db.getExpression(entryNode, parser.NodeMapExpressionEntryValue))
}
if len(valueExprs) == 0 {
// Empty map. Call the new() constructor directly.
constructor, _ := mapType.ResolveMember("new", typegraph.MemberResolutionStatic)
return codedom.MemberCall(
codedom.MemberReference(codedom.TypeLiteral(mapType, node), constructor, node),
constructor,
[]codedom.Expression{},
node)
}
constructor, _ := mapType.ResolveMember("forArrays", typegraph.MemberResolutionStatic)
return codedom.MemberCall(
codedom.MemberReference(codedom.TypeLiteral(mapType, node), constructor, node),
constructor,
[]codedom.Expression{codedom.ArrayLiteral(keyExprs, node), codedom.ArrayLiteral(valueExprs, node)},
node)
}
// buildMappingInitializerExpression builds the CodeDOM for initializing a mapping literal expression.
func (db *domBuilder) buildMappingInitializerExpression(mappingType typegraph.TypeReference, initializers map[string]codedom.Expression, node compilergraph.GraphNode) codedom.Expression {
var entries = make([]codedom.ObjectLiteralEntryNode, 0)
for name, expr := range initializers {
entries = append(entries,
codedom.ObjectLiteralEntryNode{
codedom.LiteralValue(strconv.Quote(name), expr.BasisNode()),
expr,
expr.BasisNode(),
})
}
if len(entries) == 0 {
// Empty mapping. Call the Empty() constructor directly.
constructor, _ := mappingType.ResolveMember("Empty", typegraph.MemberResolutionStatic)
return codedom.MemberCall(
codedom.MemberReference(codedom.TypeLiteral(mappingType, node), constructor, node),
constructor,
[]codedom.Expression{},
node)
}
constructor, _ := mappingType.ResolveMember("overObject", typegraph.MemberResolutionStatic)
return codedom.MemberCall(
codedom.MemberReference(codedom.TypeLiteral(mappingType, node), constructor, node),
constructor,
[]codedom.Expression{codedom.ObjectLiteral(entries, node)},
node)
}
// buildTemplateStringCall builds the CodeDOM representing the call to a template string function.
func (db *domBuilder) buildTemplateStringCall(node compilergraph.GraphNode, funcExpr codedom.Expression, isTagged bool) codedom.Expression {
pit := node.StartQuery().
Out(parser.NodeTemplateStringPiece).
BuildNodeIterator()
var pieceExprs = make([]codedom.Expression, 0)
var valueExprs = make([]codedom.Expression, 0)
var isPiece = true
for pit.Next() {
if isPiece {
pieceExprs = append(pieceExprs, db.buildExpression(pit.Node()))
} else {
valueExprs = append(valueExprs, db.buildExpression(pit.Node()))
}
isPiece = !isPiece
}
// Handle common case: No literal string piece at all.
if len(pieceExprs) == 0 {
return codedom.NominalWrapping(codedom.LiteralValue("''", node), db.scopegraph.TypeGraph().StringType(), node)
}
// Handle common case: A single literal string piece with no values.
if len(pieceExprs) == 1 && len(valueExprs) == 0 {
return pieceExprs[0]
}
pieceSliceType := db.scopegraph.TypeGraph().SliceTypeReference(db.scopegraph.TypeGraph().StringTypeReference())
valueSliceType := db.scopegraph.TypeGraph().SliceTypeReference(db.scopegraph.TypeGraph().StringableTypeReference())
constructor, _ := pieceSliceType.ResolveMember("overArray", typegraph.MemberResolutionStatic)
pieceSliceExpr := codedom.MemberCall(
codedom.MemberReference(
codedom.TypeLiteral(pieceSliceType, node), constructor, node),
constructor,
[]codedom.Expression{codedom.ArrayLiteral(pieceExprs, node)},
node)
valueSliceExpr := codedom.MemberCall(
codedom.MemberReference(
codedom.TypeLiteral(valueSliceType, node), constructor, node),
constructor,
[]codedom.Expression{codedom.ArrayLiteral(valueExprs, node)},
node)
return codedom.AwaitPromise(codedom.FunctionCall(funcExpr, []codedom.Expression{pieceSliceExpr, valueSliceExpr}, node), node)
}
// buildStructInitializerExpression builds an initializer expression for a struct type.
func (db *domBuilder) buildStructInitializerExpression(structType typegraph.TypeReference, initializers map[string]codedom.Expression, node compilergraph.GraphNode) codedom.Expression {
staticType := structType.ReferredType()
var arguments = make([]codedom.Expression, 0)
for _, field := range staticType.RequiredFields() {
arguments = append(arguments, initializers[field.Name()])
delete(initializers, field.Name())
}
constructor, found := structType.ResolveMember("new", typegraph.MemberResolutionStatic)
if !found {
panic(fmt.Sprintf("Missing new constructor on type %v", structType))
}
newCall := codedom.MemberCall(
codedom.MemberReference(
codedom.TypeLiteral(structType, node),
constructor,
node),
constructor,
arguments,
node)
// If there are no initializers, then just return the new value directly.
if len(initializers) == 0 {
return newCall
}
return db.buildInitializationCompoundExpression(structType, initializers, newCall, node)
}
// buildMatchStatement builds the CodeDOM for a match statement.
func (db *domBuilder) buildMatchStatement(node compilergraph.GraphNode) (codedom.Statement, codedom.Statement) {
// Retrieve (or generate) the name of a variable to hold the value being matched against.
var matchExprVarName = ""
if namedValue, hasNamedValue := node.TryGetNode(parser.NodeStatementNamedValue); hasNamedValue {
matchExprVarName = namedValue.Get(parser.NodeNamedValueName)
} else {
matchExprVarName = db.generateScopeVarName(node)
}
// Set the match expression's value into the variable.
startStatement := codedom.VarDefinitionWithInit(matchExprVarName, db.getExpression(node, parser.NodeMatchStatementExpression), node)
getCheckExpression := func(caseTypeRefNode compilergraph.GraphNode) codedom.Expression {
caseTypeLiteral, _ := db.scopegraph.ResolveSRGTypeRef(
db.scopegraph.SourceGraph().GetTypeRef(caseTypeRefNode))
return codedom.NominalWrapping(
codedom.RuntimeFunctionCall(codedom.IsTypeFunction,
[]codedom.Expression{
codedom.LocalReference(matchExprVarName, caseTypeRefNode),
codedom.TypeLiteral(caseTypeLiteral, caseTypeRefNode),
},
caseTypeRefNode),
db.scopegraph.TypeGraph().BoolType(),
caseTypeRefNode)
}
return db.buildJumpingCaseStatement(node, parser.NodeMatchStatementCase,
parser.NodeMatchStatementCaseStatement, parser.NodeMatchStatementCaseTypeReference,
startStatement, getCheckExpression)
}
// buildCastExpression builds the CodeDOM for a cast expression.
func (db *domBuilder) buildCastExpression(node compilergraph.GraphNode) codedom.Expression {
childExpr := db.getExpression(node, parser.NodeCastExpressionChildExpr)
// Determine the resulting type.
scope, _ := db.scopegraph.GetScope(node)
resultingType := scope.ResolvedTypeRef(db.scopegraph.TypeGraph())
// If the resulting type is a structural subtype of the child expression's type, then
// we are accessing the automatically composited inner instance.
childScope, _ := db.scopegraph.GetScope(node.GetNode(parser.NodeCastExpressionChildExpr))
childType := childScope.ResolvedTypeRef(db.scopegraph.TypeGraph())
if childType.CheckStructuralSubtypeOf(resultingType) {
return codedom.NestedTypeAccess(childExpr, resultingType, node)
}
// Otherwise, add a cast call with the cast type.
typeLiteral := codedom.TypeLiteral(resultingType, node)
allowNull := codedom.LiteralValue("false", node)
if resultingType.NullValueAllowed() {
allowNull = codedom.LiteralValue("true", node)
}
return codedom.RuntimeFunctionCall(codedom.CastFunction, []codedom.Expression{childExpr, typeLiteral, allowNull}, node)
}
// generateNominalWrapping generates the expression source for the nominal wrapping of an instance of a base type.
func (eg *expressionGenerator) generateNominalWrapping(nominalWrapping *codedom.NominalWrappingNode, context generationContext) esbuilder.ExpressionBuilder {
// If this is a wrap is of an unwrap, then cancel both operations if we are simply rewrapping
// the unwrapped type.
if unwrapping, ok := nominalWrapping.ChildExpression.(*codedom.NominalUnwrappingNode); ok {
if unwrapping.ChildExpressionType.NominalDataType() == nominalWrapping.NominalTypeRef {
// Skip entirely.
return eg.generateExpression(unwrapping.ChildExpression, context)
}
}
// If the child expression being wrapped is non-nullable and not a nominal or struct,
// then we can use a fast-path box call without the extra unboxing.
boxFunction := codedom.BoxFunction
if !nominalWrapping.ChildExpressionType.NullValueAllowed() &&
(!nominalWrapping.ChildExpressionType.IsNominalOrStruct() || nominalWrapping.IsLiteralWrap) {
boxFunction = codedom.FastBoxFunction
}
call := codedom.RuntimeFunctionCall(
boxFunction,
[]codedom.Expression{
nominalWrapping.ChildExpression,
codedom.TypeLiteral(nominalWrapping.NominalTypeRef, nominalWrapping.BasisNode())},
nominalWrapping.BasisNode())
return eg.generateExpression(call, context)
}
// buildLoopExpression builds the CodeDOM for a loop expression.
func (db *domBuilder) buildLoopExpression(node compilergraph.GraphNode) codedom.Expression {
member, found := db.scopegraph.TypeGraph().StreamType().ParentModule().FindMember("MapStream")
if !found {
panic("Missing MapStream function under Stream's module")
}
// Retrieve the item type for the members of the stream and the mapped values.
mapExpr := node.GetNode(parser.NodeLoopExpressionMapExpression)
namedValue := node.GetNode(parser.NodeLoopExpressionNamedValue)
namedScope, _ := db.scopegraph.GetScope(namedValue)
namedItemType := namedScope.AssignableTypeRef(db.scopegraph.TypeGraph())
mapScope, _ := db.scopegraph.GetScope(mapExpr)
mappedItemType := mapScope.ResolvedTypeRef(db.scopegraph.TypeGraph())
// Build a reference to the Map function.
mapFunctionReference := codedom.FunctionCall(
codedom.StaticMemberReference(member, db.scopegraph.TypeGraph().StreamTypeReference(mappedItemType), node),
[]codedom.Expression{
codedom.TypeLiteral(namedItemType, node),
codedom.TypeLiteral(mappedItemType, node),
},
node)
// A loop expression is replaced with a call to the Map function, with the stream as the first parameter
// and a mapper function which resolves the mapped value as the second.
builtMapExpr := db.buildExpression(mapExpr)
builtStreamExpr := db.getExpression(node, parser.NodeLoopExpressionStreamExpression)
loopValueName := namedValue.Get(parser.NodeNamedValueName)
mapperFunction := codedom.FunctionDefinition(
[]string{},
[]string{loopValueName},
codedom.Resolution(builtMapExpr, builtMapExpr.BasisNode()),
false,
codedom.NormalFunction,
builtMapExpr.BasisNode())
return codedom.AwaitPromise(
codedom.FunctionCall(mapFunctionReference,
[]codedom.Expression{builtStreamExpr, mapperFunction},
node),
node)
}
// buildCollectionInitializerExpression builds a literal collection expression.
func (db *domBuilder) buildCollectionInitializerExpression(collectionType typegraph.TypeReference, valueExprs []codedom.Expression, emptyConstructorName string, arrayConstructorName string, node compilergraph.GraphNode) codedom.Expression {
if len(valueExprs) == 0 {
// Empty collection. Call the empty constructor directly.
constructor, _ := collectionType.ResolveMember(emptyConstructorName, typegraph.MemberResolutionStatic)
return codedom.MemberCall(
codedom.MemberReference(codedom.TypeLiteral(collectionType, node), constructor, node),
constructor,
[]codedom.Expression{},
node)
}
arrayExpr := codedom.ArrayLiteral(valueExprs, node)
constructor, _ := collectionType.ResolveMember(arrayConstructorName, typegraph.MemberResolutionStatic)
return codedom.MemberCall(
codedom.MemberReference(codedom.TypeLiteral(collectionType, node), constructor, node),
constructor,
[]codedom.Expression{arrayExpr},
node)
}
// buildGenericSpecifierExpression builds the CodeDOM for a generic specification of a function or type.
func (db *domBuilder) buildGenericSpecifierExpression(node compilergraph.GraphNode) codedom.Expression {
childExpr := db.getExpression(node, parser.NodeGenericSpecifierChildExpr)
// Collect the generic types being specified.
git := node.StartQuery().
Out(parser.NodeGenericSpecifierType).
BuildNodeIterator()
var genericTypes = make([]codedom.Expression, 0)
for git.Next() {
replacementType, _ := db.scopegraph.ResolveSRGTypeRef(db.scopegraph.SourceGraph().GetTypeRef(git.Node()))
genericTypes = append(genericTypes, codedom.TypeLiteral(replacementType, git.Node()))
}
return codedom.FunctionCall(childExpr, genericTypes, node)
}