Method VisitTemporalBound

parse/parse.go:816–849

VisitTemporalBound visits a parse tree produced by MangleParser#temporalBound. Returns an ast.TemporalBound.

(ctx *gen.TemporalBoundContext)

// VisitTemporalBound visits a parse tree produced by MangleParser#temporalBound.
// Returns an ast.TemporalBound.
func (p Parser) VisitTemporalBound(ctx *gen.TemporalBoundContext) any {
	if ts := ctx.TIMESTAMP(); ts != nil {
		text := ts.GetText()
		t, err := parseTimestamp(text)
		if err != nil {
			p.errors.Add(fmt.Sprintf("invalid timestamp %q: %v", text, err), ctx.GetStart().GetLine(), ctx.GetStart().GetColumn())
			return ast.TemporalBound{}
		}
		return ast.NewTimestampBound(t)
	}

	if dur := ctx.DURATION(); dur != nil {
		text := dur.GetText()
		d, err := parseDuration(text)
		if err != nil {
			p.errors.Add(fmt.Sprintf("invalid duration %q: %v", text, err), ctx.GetStart().GetLine(), ctx.GetStart().GetColumn())
			return ast.TemporalBound{}
		}
		return ast.NewDurationBound(d)
	}

	if v := ctx.VARIABLE(); v != nil {
		text := v.GetText()
		return ast.NewVariableBound(ast.Variable{Symbol: text})
	}

	// Check for 'now' keyword
	if ctx.GetText() == "now" {
		return ast.Now()
	}

	p.errors.Add("unknown temporal bound", ctx.GetStart().GetLine(), ctx.GetStart().GetColumn())
	return ast.TemporalBound{}
}

// VisitTemporalOperator visits a parse tree produced by MangleParser#temporalOperator.
// Returns an *ast.TemporalOperator.