func makeRecur(node *parser.CallNode) *ast.CallExpr {
bindings := makeBindings(node.Args[0].(*parser.VectorNode), token.ASSIGN)
loopUpdate := makeAssignStmt(h.E(EvalExpr(node.Args[1])), h.E(ast.NewIdent("true")), token.ASSIGN)
body := append(h.EmptyS(), bindings...)
body = append(body, loopUpdate, makeReturnStmt(h.E(ast.NewIdent("nil"))))
resultType := makeFieldList([]*ast.Field{makeField(nil, anyType)})
fnType := makeFuncType(resultType, nil)
fn := makeFuncLit(fnType, makeBlockStmt(body))
return makeFuncCall(fn, h.EmptyE())
}
func makeLoop(node *parser.CallNode) *ast.CallExpr {
returnIdent := generateIdent()
loopIdent := generateIdent()
fnBody := h.EmptyS()
bindingsVector := node.Args[0].(*parser.VectorNode)
addRecurLabelAndBindings(parser.NewIdentNode(loopIdent.String()), bindingsVector.Copy().(*parser.VectorNode), node.Args[1:])
bindings := makeBindings(bindingsVector, token.DEFINE)
returnIdentValueSpec := makeValueSpec(h.I(returnIdent), nil, anyType)
returnIdentDecl := makeDeclStmt(makeGeneralDecl(token.VAR, []ast.Spec{returnIdentValueSpec}))
fnBody = append(fnBody, bindings...)
fnBody = append(fnBody, returnIdentDecl)
init := makeAssignStmt(h.E(loopIdent), h.E(ast.NewIdent("true")), token.DEFINE)
forBody := h.EmptyS()
forBody = append(forBody, makeAssignStmt(h.E(loopIdent), h.E(ast.NewIdent("false")), token.ASSIGN))
forBody = append(forBody, wrapExprsWithStmt(EvalExprs(node.Args[1:len(node.Args)-1]))...)
forBody = append(forBody, makeAssignStmt(h.E(returnIdent), h.E(EvalExpr(node.Args[len(node.Args)-1])), token.ASSIGN))
forStmt := makeForStmt(init, nil, loopIdent, makeBlockStmt(forBody))
fnBody = append(fnBody, forStmt)
fnBody = append(fnBody, makeReturnStmt(h.E(returnIdent)))
results := makeFieldList([]*ast.Field{makeField(nil, anyType)})
fnType := makeFuncType(results, nil)
fn := makeFuncLit(fnType, makeBlockStmt(fnBody))
return makeFuncCall(fn, h.EmptyE())
}
func makeIfStmtFunc(node *parser.CallNode) ast.Expr {
var elseBody ast.Stmt
if len(node.Args) > 2 {
elseBody = makeBlockStmt(h.S(makeReturnStmt(h.E(EvalExpr(node.Args[2])))))
} else {
elseBody = makeBlockStmt(h.S(makeReturnStmt(h.E(ast.NewIdent("nil")))))
}
cond := EvalExpr(node.Args[0])
ifBody := makeBlockStmt(h.S(makeReturnStmt(h.E(EvalExpr(node.Args[1])))))
ifStmt := makeIfStmt(cond, ifBody, elseBody)
fnBody := makeBlockStmt(h.S(ifStmt))
returnList := makeFieldList([]*ast.Field{makeField(nil, anyType)})
fnType := makeFuncType(returnList, nil)
fn := makeFuncLit(fnType, fnBody)
return makeFuncCall(fn, h.EmptyE())
}
func makeLetFun(node *parser.CallNode) ast.Expr {
bindings := makeBindings(node.Args[0].(*parser.VectorNode), token.DEFINE)
body := append(bindings, wrapExprsWithStmt(EvalExprs(node.Args[1:]))...)
body[len(body)-1] = makeReturnStmt(h.E(body[len(body)-1].(*ast.ExprStmt).X))
fieldList := makeFieldList([]*ast.Field{makeField(nil, anyType)})
typ := makeFuncType(fieldList, nil)
fn := makeFuncLit(typ, makeBlockStmt(body))
return makeFuncCall(fn, h.EmptyE())
}
func makeBindings(bindings *parser.VectorNode, assignmentType token.Token) []ast.Stmt {
assignments := make([]ast.Stmt, len(bindings.Nodes))
for i, bind := range bindings.Nodes {
b := bind.(*parser.VectorNode)
idents := b.Nodes[:len(b.Nodes)-1]
vars := make([]ast.Expr, len(idents))
for j, ident := range idents {
vars[j] = makeIdomaticSelector(ident.(*parser.IdentNode).Ident)
}
assignments[i] = makeAssignStmt(vars, h.E(EvalExpr(b.Nodes[len(b.Nodes)-1])), assignmentType)
}
return assignments
}
func makeFuncBody(exprs []ast.Expr) *ast.BlockStmt {
wrapped := wrapExprsWithStmt(exprs)
wrapped[len(wrapped)-1] = makeReturnStmt(h.E(wrapped[len(wrapped)-1].(*ast.ExprStmt).X))
return makeBlockStmt(wrapped)
}