Method parseCase

query/expr/parser.go:476–518

Assumes CASE token has been scanned.

()

// Assumes CASE token has been scanned.
func (p *Parser) parseCase() (*Case, error) {
	var kase Case
	var err error
	tok, pos, lit := p.scanIgnoreWhitespace()
	for tok == WHEN {
		var cond WhenThen

		cond.When, err = p.ParseExpr(0)
		if err != nil {
			return nil, err
		}

		tok, pos, lit = p.scanIgnoreWhitespace()
		if tok != THEN {
			return nil, newParseError(tokstr(tok, lit), []string{"THEN"}, pos)
		}

		cond.Then, err = p.ParseExpr(0)
		if err != nil {
			return nil, err
		}

		kase.WhenThens = append(kase.WhenThens, cond)
		tok, pos, lit = p.scanIgnoreWhitespace()
	}

	if len(kase.WhenThens) == 0 {
		return nil, newParseError(tokstr(tok, lit), []string{"WHEN"}, pos)
	}

	if tok == ELSE {
		kase.Else, err = p.ParseExpr(0)
		if err != nil {
			return nil, err
		}
		tok, pos, lit = p.scanIgnoreWhitespace()
	}

	if tok != END {
		return nil, newParseError(tokstr(tok, lit), []string{"END"}, pos)
	}
	return &kase, nil
}

// parseCall parses a function call.
// This function assumes the function name and LPAREN have been consumed.