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package eval
import (
"src.elv.sh/pkg/diag"
"src.elv.sh/pkg/parse"
"src.elv.sh/pkg/parse/cmpd"
)
// Utilities for working with nodes.
func stringLiteralOrError(cp *compiler, n *parse.Compound, what string) string {
s, err := cmpd.StringLiteralOrError(n, what)
if err != nil {
if len(n.Indexings) == 0 {
cp.errorpfPartial(n, "%v", err)
} else {
cp.errorpf(n, "%v", err)
}
}
return s
}
type argsGetter struct {
cp *compiler
fn *parse.Form
ok bool
n int
}
func getArgs(cp *compiler, fn *parse.Form) *argsGetter {
return &argsGetter{cp, fn, true, 0}
}
func (ag *argsGetter) errorpf(r diag.Ranger, format string, args ...any) {
if ag.ok {
ag.cp.errorpf(r, format, args...)
ag.ok = false
}
}
func (ag *argsGetter) errorpfPartial(r diag.Ranger, format string, args ...any) {
if ag.ok {
ag.cp.errorpfPartial(r, format, args...)
ag.ok = false
}
}
func (ag *argsGetter) get(i int, what string) *argAsserter {
if ag.n < i+1 {
ag.n = i + 1
}
if i >= len(ag.fn.Args) {
ag.errorpfPartial(diag.PointRanging(ag.fn.To), "need %s", what)
return &argAsserter{ag, what, nil}
}
return &argAsserter{ag, what, ag.fn.Args[i]}
}
func (ag *argsGetter) has(i int) bool { return i < len(ag.fn.Args) }
func (ag *argsGetter) hasKeyword(i int, kw string) bool {
if i < len(ag.fn.Args) {
s, ok := cmpd.StringLiteral(ag.fn.Args[i])
return ok && s == kw
}
return false
}
func (ag *argsGetter) optionalKeywordBody(i int, kw string) *parse.Primary {
if ag.has(i+1) && ag.hasKeyword(i, kw) {
return ag.get(i+1, kw+" body").thunk()
}
return nil
}
func (ag *argsGetter) finish() bool {
if ag.n < len(ag.fn.Args) {
// In general, the "superfluous" argument may actually be incomplete
// optional keywords (like "el" in an "if" form), hence this calls
// errorpfPartial instead of errorpf.
//
// TODO: Make this more accurate. We should have all the information we
// need to say that whether this is partial or not, but in order to
// retain that information we'll probably need a more declarative API
// for parsing special forms.
ag.errorpfPartial(
diag.Ranging{From: ag.fn.Args[ag.n].Range().From, To: ag.fn.To},
"superfluous arguments")
}
return ag.ok
}
type argAsserter struct {
ag *argsGetter
what string
node *parse.Compound
}
func (aa *argAsserter) any() *parse.Compound {
return aa.node
}
func (aa *argAsserter) stringLiteral() string {
if aa.node == nil {
return ""
}
s, err := cmpd.StringLiteralOrError(aa.node, aa.what)
if err != nil {
aa.ag.errorpf(aa.node, "%v", err)
return ""
}
return s
}
func (aa *argAsserter) lambda() *parse.Primary {
if aa.node == nil {
return nil
}
lambda, ok := cmpd.Lambda(aa.node)
if !ok {
if p, ok := cmpd.Primary(aa.node); ok && p.Type == parse.Braced {
// If we have seen just a "{", the parser will parse a braced
// expression, but this could as well be the start of a lambda.
aa.ag.errorpfPartial(aa.node,
"%s must be lambda, found %s", aa.what, cmpd.Shape(aa.node))
} else {
aa.ag.errorpf(aa.node,
"%s must be lambda, found %s", aa.what, cmpd.Shape(aa.node))
}
return nil
}
return lambda
}
func (aa *argAsserter) thunk() *parse.Primary {
lambda := aa.lambda()
if lambda == nil {
return nil
}
if len(lambda.Elements) > 0 {
aa.ag.errorpf(lambda, "%s must not have arguments", aa.what)
return nil
}
if len(lambda.MapPairs) > 0 {
aa.ag.errorpf(lambda, "%s must not have options", aa.what)
return nil
}
return lambda
}
|
