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fn parse-input tokens: (addr stream token), out: (addr handle cell), trace: (addr trace) {
rewind-stream tokens
var empty?/eax: boolean <- stream-empty? tokens
compare empty?, 0/false
{
break-if-=
error trace, "nothing to parse"
return
}
var close-paren?/eax: boolean <- copy 0/false
var dot?/ecx: boolean <- copy 0/false
close-paren?, dot? <- parse-sexpression tokens, out, trace
{
compare close-paren?, 0/false
break-if-=
error trace, "')' is not a valid expression"
return
}
{
compare dot?, 0/false
break-if-=
error trace, "'.' is not a valid expression"
return
}
{
var empty?/eax: boolean <- stream-empty? tokens
compare empty?, 0/false
break-if-!=
error trace, "unexpected tokens at end; only type in a single expression at a time"
}
}
# return values:
# unmatched close-paren encountered?
# dot encountered? (only used internally by recursive calls)
fn parse-sexpression tokens: (addr stream token), _out: (addr handle cell), trace: (addr trace) -> _/eax: boolean, _/ecx: boolean {
trace-text trace, "parse", "parse"
trace-lower trace
var curr-token-storage: token
var curr-token/ecx: (addr token) <- address curr-token-storage
var empty?/eax: boolean <- stream-empty? tokens
compare empty?, 0/false
{
break-if-=
error trace, "end of stream; never found a balancing ')'"
trace-higher trace
return 1/true, 0/false
}
read-from-stream tokens, curr-token
$parse-sexpression:type-check: {
# single quote -> parse as list with a special car
var quote-token?/eax: boolean <- quote-token? curr-token
compare quote-token?, 0/false
{
break-if-=
var out/edi: (addr handle cell) <- copy _out
allocate-pair out
var out-addr/eax: (addr cell) <- lookup *out
var left-ah/edx: (addr handle cell) <- get out-addr, left
new-symbol left-ah, "'"
var right-ah/edx: (addr handle cell) <- get out-addr, right
var close-paren?/eax: boolean <- copy 0/false
var dot?/ecx: boolean <- copy 0/false
close-paren?, dot? <- parse-sexpression tokens, right-ah, trace
trace-higher trace
return close-paren?, dot?
}
# backquote quote -> parse as list with a special car
var backquote-token?/eax: boolean <- backquote-token? curr-token
compare backquote-token?, 0/false
{
break-if-=
var out/edi: (addr handle cell) <- copy _out
allocate-pair out
var out-addr/eax: (addr cell) <- lookup *out
var left-ah/edx: (addr handle cell) <- get out-addr, left
new-symbol left-ah, "`"
var right-ah/edx: (addr handle cell) <- get out-addr, right
var close-paren?/eax: boolean <- copy 0/false
var dot?/ecx: boolean <- copy 0/false
close-paren?, dot? <- parse-sexpression tokens, right-ah, trace
trace-higher trace
return close-paren?, dot?
}
# unquote -> parse as list with a special car
var unquote-token?/eax: boolean <- unquote-token? curr-token
compare unquote-token?, 0/false
{
break-if-=
var out/edi: (addr handle cell) <- copy _out
allocate-pair out
var out-addr/eax: (addr cell) <- lookup *out
var left-ah/edx: (addr handle cell) <- get out-addr, left
new-symbol left-ah, ","
var right-ah/edx: (addr handle cell) <- get out-addr, right
var close-paren?/eax: boolean <- copy 0/false
var dot?/ecx: boolean <- copy 0/false
close-paren?, dot? <- parse-sexpression tokens, right-ah, trace
trace-higher trace
return close-paren?, dot?
}
# unquote-splice -> parse as list with a special car
var unquote-splice-token?/eax: boolean <- unquote-splice-token? curr-token
compare unquote-splice-token?, 0/false
{
break-if-=
var out/edi: (addr handle cell) <- copy _out
allocate-pair out
var out-addr/eax: (addr cell) <- lookup *out
var left-ah/edx: (addr handle cell) <- get out-addr, left
new-symbol left-ah, ",@"
var right-ah/edx: (addr handle cell) <- get out-addr, right
var close-paren?/eax: boolean <- copy 0/false
var dot?/ecx: boolean <- copy 0/false
close-paren?, dot? <- parse-sexpression tokens, right-ah, trace
trace-higher trace
return close-paren?, dot?
}
# dot -> return
var dot?/eax: boolean <- dot-token? curr-token
compare dot?, 0/false
{
break-if-=
trace-higher trace
return 0/false, 1/true
}
# not bracket -> parse atom
var bracket-token?/eax: boolean <- bracket-token? curr-token
compare bracket-token?, 0/false
{
break-if-!=
parse-atom curr-token, _out, trace
break $parse-sexpression:type-check
}
# open paren -> parse list
var open-paren?/eax: boolean <- open-paren-token? curr-token
compare open-paren?, 0/false
{
break-if-=
var curr/esi: (addr handle cell) <- copy _out
allocate-pair curr
var curr-addr/eax: (addr cell) <- lookup *curr
var left/edx: (addr handle cell) <- get curr-addr, left
{
var close-paren?/eax: boolean <- copy 0/false
var dot?/ecx: boolean <- copy 0/false
close-paren?, dot? <- parse-sexpression tokens, left, trace
{
compare dot?, 0/false
break-if-=
error trace, "'.' cannot be at the start of a list"
return 1/true, dot?
}
compare close-paren?, 0/false
break-if-!=
var curr-addr/eax: (addr cell) <- lookup *curr
curr <- get curr-addr, right
var tmp-storage: (handle cell)
var tmp/edx: (addr handle cell) <- address tmp-storage
$parse-sexpression:list-loop: {
var close-paren?/eax: boolean <- copy 0/false
var dot?/ecx: boolean <- copy 0/false
close-paren?, dot? <- parse-sexpression tokens, tmp, trace
# '.' -> clean up right here and return
compare dot?, 0/false
{
break-if-=
parse-dot-tail tokens, curr, trace
return 0/false, 0/false
}
allocate-pair curr
# ')' -> return
compare close-paren?, 0/false
break-if-!=
var curr-addr/eax: (addr cell) <- lookup *curr
var left/ecx: (addr handle cell) <- get curr-addr, left
copy-object tmp, left
#
curr <- get curr-addr, right
loop
}
}
break $parse-sexpression:type-check
}
# close paren -> return
var close-paren?/eax: boolean <- close-paren-token? curr-token
compare close-paren?, 0/false
{
break-if-=
trace-higher trace
return 1/true, 0/false
}
# otherwise abort
var stream-storage: (stream byte 0x400)
var stream/edx: (addr stream byte) <- address stream-storage
write stream, "unexpected token "
var curr-token-data-ah/eax: (addr handle stream byte) <- get curr-token, text-data
var curr-token-data/eax: (addr stream byte) <- lookup *curr-token-data-ah
rewind-stream curr-token-data
write-stream stream, curr-token-data
error-stream trace, stream
}
trace-higher trace
return 0/false, 0/false
}
fn parse-atom _curr-token: (addr token), _out: (addr handle cell), trace: (addr trace) {
trace-text trace, "parse", "parse atom"
var curr-token/ecx: (addr token) <- copy _curr-token
var curr-token-data-ah/eax: (addr handle stream byte) <- get curr-token, text-data
var _curr-token-data/eax: (addr stream byte) <- lookup *curr-token-data-ah
var curr-token-data/esi: (addr stream byte) <- copy _curr-token-data
trace trace, "parse", curr-token-data
# number
var number-token?/eax: boolean <- number-token? curr-token
compare number-token?, 0/false
{
break-if-=
rewind-stream curr-token-data
var _val/eax: int <- parse-decimal-int-from-stream curr-token-data
var val/ecx: int <- copy _val
var val-float/xmm0: float <- convert val
allocate-number _out
var out/eax: (addr handle cell) <- copy _out
var out-addr/eax: (addr cell) <- lookup *out
var dest/edi: (addr float) <- get out-addr, number-data
copy-to *dest, val-float
{
{
var should-trace?/eax: boolean <- should-trace? trace
compare should-trace?, 0/false
}
break-if-=
var stream-storage: (stream byte 0x400)
var stream/ecx: (addr stream byte) <- address stream-storage
write stream, "=> number "
var nested-trace-storage: trace
var nested-trace/edi: (addr trace) <- address nested-trace-storage
initialize-trace nested-trace, 1/only-errors, 0x10/capacity, 0/visible
print-number out-addr, stream, nested-trace
trace trace, "parse", stream
}
return
}
# default: copy either to a symbol or a stream
# stream token -> literal
var stream-token?/eax: boolean <- stream-token? curr-token
compare stream-token?, 0/false
{
break-if-=
allocate-stream _out
}
compare stream-token?, 0/false
{
break-if-!=
allocate-symbol _out
}
# copy token data
var out/eax: (addr handle cell) <- copy _out
var out-addr/eax: (addr cell) <- lookup *out
var curr-token-data-ah/ecx: (addr handle stream byte) <- get curr-token, text-data
var dest-ah/edx: (addr handle stream byte) <- get out-addr, text-data
copy-object curr-token-data-ah, dest-ah
{
{
var should-trace?/eax: boolean <- should-trace? trace
compare should-trace?, 0/false
}
break-if-=
var stream-storage: (stream byte 0x40000)
var stream/ecx: (addr stream byte) <- address stream-storage
write stream, "=> symbol "
var nested-trace-storage: trace
var nested-trace/edi: (addr trace) <- address nested-trace-storage
initialize-trace nested-trace, 1/only-errors, 0x10/capacity, 0/visible
print-symbol out-addr, stream, nested-trace
trace trace, "parse", stream
}
}
fn parse-dot-tail tokens: (addr stream token), _out: (addr handle cell), trace: (addr trace) {
var out/edi: (addr handle cell) <- copy _out
var close-paren?/eax: boolean <- copy 0/false
var dot?/ecx: boolean <- copy 0/false
close-paren?, dot? <- parse-sexpression tokens, out, trace
compare close-paren?, 0/false
{
break-if-=
error trace, "'. )' makes no sense"
return
}
compare dot?, 0/false
{
break-if-=
error trace, "'. .' makes no sense"
return
}
#
var dummy: (handle cell)
var dummy-ah/edi: (addr handle cell) <- address dummy
close-paren?, dot? <- parse-sexpression tokens, dummy-ah, trace
compare close-paren?, 0/false
{
break-if-!=
error trace, "cannot have multiple expressions between '.' and ')'"
return
}
compare dot?, 0/false
{
break-if-=
error trace, "cannot have two dots in a single list"
return
}
}
|