Matching {

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l4m2

Joined: 15 Jan 2015
Posts: 670

l4m2 06 Aug 2016, 15:25

Code:

macro xxx [x] {
  common
  match a =\{ b, x \{
    err
  \}
}
xxx 3 { nop }

I want to split 3 { nop } into 3 and {nop} but it says Illegal instruction at {.

06 Aug 2016, 15:25

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8427
Location: Kraków, Poland

Tomasz Grysztar 06 Aug 2016, 16:21

When evaluating outer macro, the "match" line becomes:

Code:

match a ={ b, 2 { nop } {

and then the "{ nop }" becomes interpreted as the content of the "match" block, with additional "{" after the block.
You can get around this problem by defining a temporary symbolic variable to hold matched value:

Code:

macro xxx [x] {
  common local y
  y equ x
  match a =\{ b, y \{
    err
  \} 
} 
xxx 3 { nop }

On a side note, you don't have to use "=" to match "{". And instead of using repeatable argument and "common" block, you can used the new syntax with "&":

Code:

macro xxx x& {
  local y
  y equ x
  match a \{ b, y \{
    err
  \} 
} 
xxx 3 { nop }

06 Aug 2016, 16:21

l4m2

Joined: 15 Jan 2015
Posts: 670

l4m2 06 Aug 2016, 16:56

Code:

macro xxx x& {
  local y
  y equ x 
  match a \{ b, y \{
    match a, test 1
    b
  \}  
}  
xxx =test any { nop
  nop
}

makes an unexpected characters

06 Aug 2016, 16:56

l4m2

Joined: 15 Jan 2015
Posts: 670

l4m2 06 Aug 2016, 17:24

Code:

macro xxx x& {
  local y, q, t
  y equ x 
  match =q a \{ b, q y \{
    q equ
    s equ a
    t equ b
  \}
  match =q a \{  , q y \{
    q equ
    s equ a
    t equ
  \}
  match s, test 1 \{
  t
}
;This works fine
xxx =test any  {
rept 3 i:48 \{display i\}}
;But not this
xxx =test any  {rept 3 i:48 \{display i\}}

06 Aug 2016, 17:24

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