Routines
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B694: Parser: Validate Two Direct Objects
Used by the routines at Action_Throw and Action_Play.
Parser: Validate Two Direct Objects.
Output
F The carry flag is set when the command is malformed
ParserValidateTwoDirectObjects B694 CALL ParserValidateDirectObject Call ParserValidateDirectObject to check that the command names an object.
B697 RET C Return if there is no direct object in the user input (so the command is malformed).
A now contains the count of the number of valid direct objects.
B698 CP $01 Jump to ValidateTwoDirectObjects if the number of valid direct objects in the user input is not 01.
B69A JR NZ,ValidateTwoDirectObjects
There is only one valid direct object in the user input and the command needs two...
B69C CALL Messaging_PleaseBeMoreSpecific_Newline Call Messaging_PleaseBeMoreSpecific_Newline to ask for a more specific command.
B69F SCF Set the carry flag to report that the command is malformed.
B6A0 RET Return.
There are two or more valid direct objects in the user input.
ValidateTwoDirectObjects B6A1 CP $03 Jump to ValidateTwoDirectObjects_TooMany if the number of valid direct objects in the user input is greater than or equal to 03.
B6A3 JR NC,ValidateTwoDirectObjects_TooMany
B6A5 AND A Clear the carry flag: exactly two objects were named, so the command is valid.
B6A6 RET Return.
There are more than two valid direct objects in the user input.
ValidateTwoDirectObjects_TooMany B6A7 CALL Messaging_PleaseRephraseThat_Newline Call Messaging_PleaseRephraseThat_Newline to ask the player to rephrase.
B6AA SCF Set the carry flag to report that the command is malformed.
B6AB RET Return.
View the equivalent code in;
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