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## putting the environment together out of editors
def! main [
local-scope
open-console
clear-screen 0/screen # non-scrolling app
env:&:environment <- new-programming-environment 0/filesystem, 0/screen
render-all 0/screen, env, render
event-loop 0/screen, 0/console, env, 0/filesystem
]
container environment [
current-sandbox:&:editor
]
def new-programming-environment resources:&:resources, screen:&:screen, test-sandbox-editor-contents:text -> result:&:environment [
local-scope
load-inputs
width:num <- screen-width screen
result <- new environment:type
# sandbox editor
current-sandbox:&:editor <- new-editor test-sandbox-editor-contents, 0/left, width/right
*result <- put *result, current-sandbox:offset, current-sandbox
<programming-environment-initialization>
]
def event-loop screen:&:screen, console:&:console, env:&:environment, resources:&:resources -> screen:&:screen, console:&:console, env:&:environment, resources:&:resources [
local-scope
load-inputs
current-sandbox:&:editor <- get *env, current-sandbox:offset
# if we fall behind we'll stop updating the screen, but then we have to
# render the entire screen when we catch up.
# todo: test this
render-all-on-no-more-events?:bool <- copy false
{
# looping over each (keyboard or touch) event as it occurs
+next-event
e:event, found?:bool, quit?:bool, console <- read-event console
loop-unless found?
break-if quit? # only in tests
trace 10, [app], [next-event]
<handle-event>
# check for global events that will trigger regardless of which editor has focus
{
k:num, is-keycode?:bool <- maybe-convert e:event, keycode:variant
break-unless is-keycode?
<global-keypress>
}
{
c:char, is-unicode?:bool <- maybe-convert e:event, text:variant
break-unless is-unicode?
<global-type>
}
# 'touch' event
{
t:touch-event, is-touch?:bool <- maybe-convert e:event, touch:variant
break-unless is-touch?
# ignore all but 'left-click' events for now
# todo: test this
touch-type:num <- get t, type:offset
is-left-click?:bool <- equal touch-type, 65513/mouse-left
loop-unless is-left-click?, +next-event
click-row:num <- get t, row:offset
click-column:num <- get t, column:offset
# later exceptions for non-editor touches will go here
<global-touch>
move-cursor current-sandbox, screen, t
screen <- update-cursor screen, current-sandbox, env
loop +next-event
}
# 'resize' event - redraw editor
# todo: test this after supporting resize in assume-console
{
r:resize-event, is-resize?:bool <- maybe-convert e:event, resize:variant
break-unless is-resize?
env, screen <- resize screen, env
screen <- render-all screen, env, render-without-moving-cursor
loop +next-event
}
# not global and not a touch event
{
render?:bool <- handle-keyboard-event screen, current-sandbox, e:event
# try to batch up rendering if there are more events queued up
render-all-on-no-more-events? <- or render-all-on-no-more-events?, render?
more-events?:bool <- has-more-events? console
{
break-if more-events?
break-unless render-all-on-no-more-events?
render-all-on-no-more-events? <- copy false
screen <- render-all screen, env, render
}
screen <- update-cursor screen, current-sandbox, env
}
loop
}
]
def resize screen:&:screen, env:&:environment -> env:&:environment, screen:&:screen [
local-scope
load-inputs
clear-screen screen # update screen dimensions
width:num <- screen-width screen
# update sandbox editor
current-sandbox:&:editor <- get *env, current-sandbox:offset
right:num <- subtract width, 1
*current-sandbox <- put *current-sandbox right:offset, right
# reset cursor
*current-sandbox <- put *current-sandbox, cursor-row:offset, 1
*current-sandbox <- put *current-sandbox, cursor-column:offset, 0
]
# Variant of 'render' that updates cursor-row and cursor-column based on
# before-cursor (rather than the other way around). If before-cursor moves
# off-screen, it resets cursor-row and cursor-column.
def render-without-moving-cursor screen:&:screen, editor:&:editor -> last-row:num, last-column:num, screen:&:screen, editor:&:editor [
local-scope
load-inputs
return-unless editor, 1/top, 0/left
left:num <- get *editor, left:offset
screen-height:num <- screen-height screen
right:num <- get *editor, right:offset
curr:&:duplex-list:char <- get *editor, top-of-screen:offset
prev:&:duplex-list:char <- copy curr # just in case curr becomes null and we can't compute prev
curr <- next curr
color:num <- copy 7/white
row:num <- copy 1/top
column:num <- copy left
# save before-cursor
old-before-cursor:&:duplex-list:char <- get *editor, before-cursor:offset
# initialze cursor-row/cursor-column/before-cursor to the top of the screen
# by default
*editor <- put *editor, cursor-row:offset, row
*editor <- put *editor, cursor-column:offset, column
top-of-screen:&:duplex-list:char <- get *editor, top-of-screen:offset
*editor <- put *editor, before-cursor:offset, top-of-screen
screen <- move-cursor screen, row, column
{
+next-character
break-unless curr
off-screen?:bool <- greater-or-equal row, screen-height
break-if off-screen?
# if we find old-before-cursor still on the new resized screen, update
# editor.cursor-row and editor.cursor-column based on
# old-before-cursor
{
at-cursor?:bool <- equal old-before-cursor, prev
break-unless at-cursor?
*editor <- put *editor, cursor-row:offset, row
*editor <- put *editor, cursor-column:offset, column
*editor <- put *editor, before-cursor:offset, old-before-cursor
}
c:char <- get *curr, value:offset
<character-c-received>
{
# newline? move to left rather than 0
newline?:bool <- equal c, 10/newline
break-unless newline?
# clear rest of line in this window
clear-line-until screen, right
# skip to next line
row <- add row, 1
column <- copy left
screen <- move-cursor screen, row, column
curr <- next curr
prev <- next prev
loop +next-character
}
{
# at right? wrap. even if there's only one more letter left; we need
# room for clicking on the cursor after it.
at-right?:bool <- equal column, right
break-unless at-right?
# print wrap icon
wrap-icon:char <- copy 8617/loop-back-to-left
print screen, wrap-icon, 245/grey
column <- copy left
row <- add row, 1
screen <- move-cursor screen, row, column
# don't increment curr
loop +next-character
}
print screen, c, color
curr <- next curr
prev <- next prev
column <- add column, 1
loop
}
# save first character off-screen
*editor <- put *editor, bottom-of-screen:offset, curr
*editor <- put *editor, bottom:offset, row
return row, column
]
type render-recipe = (recipe (address screen) (address editor) -> number number (address screen) (address editor))
def render-all screen:&:screen, env:&:environment, render-editor:render-recipe -> screen:&:screen, env:&:environment [
local-scope
load-inputs
trace 10, [app], [render all]
# top menu
trace 11, [app], [render top menu]
width:num <- screen-width screen
draw-horizontal screen, 0, 0/left, width, 32/space, 0/black, 238/grey
button-start:num <- subtract width, 20
button-on-screen?:bool <- greater-or-equal button-start, 0
assert button-on-screen?, [screen too narrow for menu]
screen <- move-cursor screen, 0/row, button-start
print screen, [ run (F4) ], 255/white, 161/reddish
#
screen <- render-sandbox-side screen, env, render-editor
<end-render-components> # no early returns permitted
#
current-sandbox:&:editor <- get *env, current-sandbox:offset
screen <- update-cursor screen, current-sandbox, env
]
# replaced in a later layer
def render-sandbox-side screen:&:screen, env:&:environment, render-editor:render-recipe -> screen:&:screen, env:&:environment [
local-scope
load-inputs
trace 11, [app], [render sandboxes]
old-top-idx:num <- save-top-idx screen
current-sandbox:&:editor <- get *env, current-sandbox:offset
left:num <- get *current-sandbox, left:offset
right:num <- get *current-sandbox, right:offset
row:num, column:num, screen, current-sandbox <- call render-editor, screen, current-sandbox
# draw solid line after code (you'll see why in later layers)
draw-horizontal screen, row, left, right
row <- add row, 1
clear-screen-from screen, row, left, left, right
#
assert-no-scroll screen, old-top-idx
]
def update-cursor screen:&:screen, current-sandbox:&:editor, env:&:environment -> screen:&:screen [
local-scope
load-inputs
<update-cursor-special-cases>
cursor-row:num <- get *current-sandbox, cursor-row:offset
cursor-column:num <- get *current-sandbox, cursor-column:offset
screen <- move-cursor screen, cursor-row, cursor-column
]
scenario backspace-over-text [
local-scope
trace-until 100/app # trace too long
assume-screen 50/width, 15/height
# recipes.mu is empty
assume-resources [
]
# sandbox editor contains an instruction without storing outputs
env:&:environment <- new-programming-environment resources, screen, []
render-all screen, env, render
# run the code in the editors
assume-console [
type [a]
press backspace
]
run [
event-loop screen, console, env, resources
10:num/raw <- get *screen, cursor-row:offset
11:num/raw <- get *screen, cursor-column:offset
]
memory-should-contain [
10 <- 1
11 <- 0
]
]
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