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Text: ex

[BBC Micro disc version, Docked]

Name: ex [Show more] Type: Subroutine Category: Text Summary: Print a recursive token Deep dive: Printing text tokens
Context: See this subroutine in context in the source code References: This subroutine is called as follows: * qw calls ex * TT27 calls ex * TT43 calls via TT48 * TT45 calls via TT48

This routine works its way through the recursive text tokens that are stored in tokenised form in the table at QQ18, and when it finds token number A, it prints it. Tokens are null-terminated in memory and fill three pages, but there is no lookup table as that would consume too much memory, so the only way to find the correct token is to start at the beginning and look through the table byte by byte, counting tokens as we go until we are in the right place. This approach might not be terribly speed efficient, but it is certainly memory-efficient.
Arguments: A The recursive token to be printed, in the range 0-148
Other entry points: TT48 Contains an RTS
.ex TAX \ Copy the token number into X LDA #LO(QQ18) \ Set V(1 0) to point to the recursive token table at STA V \ location QQ18 LDA #HI(QQ18) STA V+1 LDY #0 \ Set a counter Y to point to the character offset \ as we scan through the table TXA \ Copy the token number back into A, so both A and X \ now contain the token number we want to print BEQ TT50 \ If the token number we want is 0, then we have \ already found the token we are looking for, so jump \ to TT50, otherwise start working our way through the \ null-terminated token table until we find the X-th \ token .TT51 LDA (V),Y \ Fetch the Y-th character from the token table page \ we are currently scanning BEQ TT49 \ If the character is null, we've reached the end of \ this token, so jump to TT49 INY \ Increment character pointer and loop back around for BNE TT51 \ the next character in this token, assuming Y hasn't \ yet wrapped around to 0 INC V+1 \ If it has wrapped round to 0, we have just crossed BNE TT51 \ into a new page, so increment V+1 so that V points \ to the start of the new page .TT49 INY \ Increment the character pointer BNE TT59 \ If Y hasn't just wrapped around to 0, skip the next \ instruction INC V+1 \ We have just crossed into a new page, so increment \ V+1 so that V points to the start of the new page .TT59 DEX \ We have just reached a new token, so decrement the \ token number we are looking for BNE TT51 \ Assuming we haven't yet reached the token number in \ X, look back up to keep fetching characters .TT50 \ We have now reached the correct token in the token \ table, with Y pointing to the start of the token as \ an offset within the page pointed to by V, so let's \ print the recursive token. Because recursive tokens \ can contain other recursive tokens, we need to store \ our current state on the stack, so we can retrieve \ it after printing each character in this token TYA \ Store the offset in Y on the stack PHA LDA V+1 \ Store the high byte of V (the page containing the PHA \ token we have found) on the stack, so the stack now \ contains the address of the start of this token LDA (V),Y \ Load the character at offset Y in the token table, \ which is the next character of this token that we \ want to print EOR #RE \ Tokens are stored in memory having been EOR'd with the \ value of RE - which is 35 for all versions of Elite \ except for NES, where RE is 62 - so we repeat the \ EOR to get the actual character to print JSR TT27 \ Print the text token in A, which could be a letter, \ number, control code, two-letter token or another \ recursive token PLA \ Restore the high byte of V (the page containing the STA V+1 \ token we have found) into V+1 PLA \ Restore the offset into Y TAY INY \ Increment Y to point to the next character in the \ token we are printing BNE P%+4 \ If Y is zero then we have just crossed into a new INC V+1 \ page, so increment V+1 so that V points to the start \ of the new page LDA (V),Y \ Load the next character we want to print into A BNE TT50 \ If this is not the null character at the end of the \ token, jump back up to TT50 to print the next \ character, otherwise we are done printing .TT48 RTS \ Return from the subroutine