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2022-03-11 12:39:52 +01:00
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# PL/XML Syntax
Programs that do not respect this syntax may (and probably
will) still work, but with no guarantee.
## McKeeman Form
```
plxml
program
program
"<program=" tag ">" functions main functions "</program>"
tag
'"' characters '"'
characters
''
character characters
character
'0020' . '10FFFF' - '"' - '0027' - '<' - '>' - '&'
'&' escapes ';'
ws
""
'0020' ws
'000A' ws
'000D' ws
'0009' ws
escapes
"quot"
"apos"
"lt"
"gt"
"amp"
main
ws "<main>" instructions "</main>" ws
functions
""
function functions
function
ws "<function name=" tag ">" ws "<arguments>" arguments "</arguments>" ws "<body>" instructions "</body>" ws "</function>" ws
arguments
""
argument arguments
argument
ws "<argument name=" tag "/>" ws
instructions
ws "" ws
instruction instructions
instruction
ws _instruction ws
_instruction
value
assign
integer
float
string
array
add
subtract
multiply
divide
and
or
not
equal
greater
lower
call
return
if
for
each
while
value
"<value variable=" tag "/>"
assign
"<assign variable=" tag ">" instruction "</assign>"
integer
"<integer value=" tag "/>"
"<integer>" instruction "</integer>"
float
"<float value=" tag "/>"
"<float>" instruction "</float>"
string
"<string value=" tag "/>"
"<string>" instruction "</string>"
array
"<array>" instructions "</array>"
add
"<add>" instructions "</add>"
subtract
"<subtract>" instructions "</subtract>"
multiply
"<multiply>" instructions "</multiply>"
divide
"<divide>" instructions "</divide>"
and
"<and>" instructions "</and>"
or
"<or>" instructions "</or>"
not
"<not>" instruction "</not>"
equal
"<equal>" instruction instruction "</equal>"
greater
"<greater>" instruction instruction "</greater>"
lower
"<lower>" instruction instruction "</lower>"
call
"<call function=" tag ">" ws "<arguments>" instructions "</arguments>" ws "</call>"
"<call>" instruction "<arguments>" instructions "</arguments>" ws "</call>"
return
"<return>" instruction "</return>"
if
"<if>" ws instruction ws "<then>" instructions "</then>" ws "</if>"
"<if>" ws instruction ws "<then>" instructions "</then>" ws "<else>" instructions "</else>" ws "</if>"
each
"<each variable=" tag ">" instruction do "</each>"
while
"<while>" instruction do "</while>"
for
"<for variable=" tag ">" ws from to step do "</for>"
from
ws "<from>" instruction "</from>" ws
to
ws "<to>" instruction "</to>" ws
step
ws "<step>" instruction "</step>" ws
do
ws "<do>" instructions "</do>" ws
```