Flipping Code
We show how to flip large chunks of text in a transpiler, using a small change in the code.
Desired Output
Input
We’re working a code markdown to bash converter.
At this point, the input looks like:
# _containment_
## _fb pipeline_
allContains1
printAllDeepContains
printAllDirectContains
## _details_
### allContains1
load fb
load onSameDiagram
load contain1
### printAllDeepContains
load fb
load onSameDiagram
load contains2
### printAllDirectContains
load fb
load onSameDiagram
load contains3
Desired
The lines in the _fb pipeline_ are meant to be bash and the ### chunks are meant to be bash functions.
Bash requires declaration before use, so, at this stage, we want the fb pipeline lines to come last.
For example, we want and intermediate result of:
# _containment_
## _details_
### allContains1
load fb
load onSameDiagram
load contain1
### printAllDeepContains
load fb
load onSameDiagram
load contains2
### printAllDirectContains
load fb
load onSameDiagram
load contains3
## _fb pipeline_
allContains1
printAllDeepContains
printAllDirectContains
This can be done with a minor tweak in the emit code…
Grok
Pseudo {
Main = "{" id Commands Details "}"
Commands = "{" id Block+ "}"
Details = "{" id Block+ "}"
Block = "{" id (id | Block)+ "}" -- rec
| id+ -- flat
id = italicid | ident
underscore = "_"
newline = "\n"
spc = " "
notEOL = ~newline any
italicid = underscore ident underscore
ident = firstChar followChar*
firstChar = letter
followChar = alnum | " "
}
Emit
Main [lb id commands details rb] = [[# ${id}\n${commands}\n${details}]]
Commands [lb id @choices rb] = [[# ${id}\n${choices}]]
Details [lb id @choices rb] = [[# ${id}${choices}]]
Block_rec [lb id @b rb] = [[${lb}${id}${b}${rb}]]
Block_flat [@ids] = [[${ids}]]
id [name] = [[${name}\n]]
underscore [c] = [[${c}]]
newline [c] = [[${c}]]
spc [c] = [[${c}]]
notEOL [c] = [[${c}]]
italicid [u1 id u2] = [[${u1}${id}${u2}]]
ident [f @cs] = [[${f}${cs}]]
firstChar [c] = [[${c}]]
followChar [c] = [[${c}]]
The Flip
Change 1 line:
Main [lb id commands details rb] = [[# ${id}\n${commands}\n${details}]]
to
Main [lb id commands details rb] = [[# ${id}\n${details}\n${commands}]]