Method parseUpdateCommand

parser/parser.go:623–700

parseUpdateCommand - Return ast.parseUpdateCommand created from tokens and validate the syntax Example of input parsable to the ast.parseUpdateCommand: UPDATE table SET col1 TO 'value' WHERE col2 EQUAL 10;

()

// Example of input parsable to the ast.parseUpdateCommand:
// UPDATE table SET col1 TO 'value' WHERE col2 EQUAL 10;
func (parser *Parser) parseUpdateCommand() (ast.Command, error) {
	// token.UPDATE already at current position in parser
	updateCommand := &ast.UpdateCommand{Token: parser.currentToken}

	// Ignore token.UPDATE
	parser.nextToken()

	// Get table name
	err := validateToken(parser.currentToken.Type, []token.Type{token.IDENT})
	if err != nil {
		return nil, err
	}
	updateCommand.Name = ast.Identifier{Token: parser.currentToken}

	// Ignore token.IDENT
	parser.nextToken()

	err = validateTokenAndSkip(parser, []token.Type{token.SET})
	if err != nil {
		return nil, err
	}

	err = validateToken(parser.currentToken.Type, []token.Type{token.IDENT})
	if err != nil {
		return nil, err
	}

	updateCommand.Changes = make(map[token.Token]ast.Anonymitifier)
	for parser.currentToken.Type == token.IDENT {
		// Get column name
		err := validateToken(parser.currentToken.Type, []token.Type{token.IDENT})
		if err != nil {
			return nil, err
		}
		colKey := parser.currentToken

		// skip column name
		parser.nextToken()

		err = validateToken(parser.currentToken.Type, []token.Type{token.TO})
		if err != nil {
			return nil, err
		}
		// skip token.TO
		parser.nextToken()

		startedWithApostrophe := parser.skipIfCurrentTokenIsApostrophe()
		err = validateToken(parser.currentToken.Type, []token.Type{token.IDENT, token.LITERAL, token.NULL})
		if err != nil {
			return nil, err
		}
		updateCommand.Changes[colKey] = ast.Anonymitifier{Token: parser.currentToken}

		// skip token.IDENT, token.LITERAL or token.NULL
		parser.nextToken()
		finishedWithApostrophe := parser.skipIfCurrentTokenIsApostrophe()

		err = validateApostropheWrapping(startedWithApostrophe, finishedWithApostrophe, updateCommand.Changes[colKey].GetToken())