71e4f38129
Baremetal is now the default build target and therefore has its sources at the top-level. Baremetal programs build using the phase-2 Mu toolchain that requires a Linux kernel. This phase-2 codebase which used to be at the top-level is now under the linux/ directory. Finally, the phase-2 toolchain, while self-hosting, has a way to bootstrap from a C implementation, which is now stored in linux/bootstrap. The bootstrap C implementation uses some literate programming tools that are now in linux/bootstrap/tools. So the whole thing has gotten inverted. Each directory should build one artifact and include the main sources (along with standard library). Tools used for building it are relegated to sub-directories, even though those tools are often useful in their own right, and have had lots of interesting programs written using them. A couple of things have gotten dropped in this process: - I had old ways to run on just a Linux kernel, or with a Soso kernel. No more. - I had some old tooling for running a single test at the cursor. I haven't used that lately. Maybe I'll bring it back one day. The reorg isn't done yet. Still to do: - redo documentation everywhere. All the README files, all other markdown, particularly vocabulary.md. - clean up how-to-run comments at the start of programs everywhere - rethink what to do with the html/ directory. Do we even want to keep supporting it? In spite of these shortcomings, all the scripts at the top-level, linux/ and linux/bootstrap are working. The names of the scripts also feel reasonable. This is a good milestone to take stock at.
126 lines
4.2 KiB
Forth
126 lines
4.2 KiB
Forth
# read up to 'len' graphemes after skipping the first 'start' ones
|
|
fn substring in: (addr array byte), start: int, len: int, out-ah: (addr handle array byte) {
|
|
var in-stream: (stream byte 0x100)
|
|
var in-stream-addr/esi: (addr stream byte) <- address in-stream
|
|
write in-stream-addr, in
|
|
var out-stream: (stream byte 0x100)
|
|
var out-stream-addr/edi: (addr stream byte) <- address out-stream
|
|
$substring:core: {
|
|
# skip 'start' graphemes
|
|
var i/eax: int <- copy 0
|
|
{
|
|
compare i, start
|
|
break-if->=
|
|
{
|
|
var dummy/eax: grapheme <- read-grapheme in-stream-addr
|
|
compare dummy, 0xffffffff/end-of-file
|
|
break-if-= $substring:core
|
|
}
|
|
i <- increment
|
|
loop
|
|
}
|
|
# copy 'len' graphemes
|
|
i <- copy 0
|
|
{
|
|
compare i, len
|
|
break-if->=
|
|
{
|
|
var g/eax: grapheme <- read-grapheme in-stream-addr
|
|
compare g, 0xffffffff/end-of-file
|
|
break-if-= $substring:core
|
|
write-grapheme out-stream-addr, g
|
|
}
|
|
i <- increment
|
|
loop
|
|
}
|
|
}
|
|
stream-to-array out-stream-addr, out-ah
|
|
}
|
|
|
|
fn test-substring {
|
|
var out-h: (handle array byte)
|
|
var out-ah/edi: (addr handle array byte) <- address out-h
|
|
# prefix substrings
|
|
substring 0, 0, 3, out-ah
|
|
var out/eax: (addr array byte) <- lookup *out-ah
|
|
check-strings-equal out, "", "F - test-substring/null"
|
|
substring "", 0, 3, out-ah
|
|
var out/eax: (addr array byte) <- lookup *out-ah
|
|
#? print-string-to-real-screen out
|
|
#? print-string-to-real-screen "\n"
|
|
check-strings-equal out, "", "F - test-substring/empty"
|
|
#
|
|
substring "abcde", 0, 3, out-ah
|
|
var out/eax: (addr array byte) <- lookup *out-ah
|
|
#? print-string-to-real-screen out
|
|
#? print-string-to-real-screen "\n"
|
|
check-strings-equal out, "abc", "F - test-substring/truncate"
|
|
#
|
|
substring "abcde", 0, 5, out-ah
|
|
var out/eax: (addr array byte) <- lookup *out-ah
|
|
check-strings-equal out, "abcde", "F - test-substring/all"
|
|
#
|
|
substring "abcde", 0, 7, out-ah
|
|
var out/eax: (addr array byte) <- lookup *out-ah
|
|
check-strings-equal out, "abcde", "F - test-substring/too-small"
|
|
# substrings outside string
|
|
substring "abcde", 6, 1, out-ah
|
|
var out/eax: (addr array byte) <- lookup *out-ah
|
|
check-strings-equal out, "", "F - test-substring/start-too-large"
|
|
# trim prefix
|
|
substring "", 2, 3, out-ah
|
|
var out/eax: (addr array byte) <- lookup *out-ah
|
|
check-strings-equal out, "", "F - test-substring/middle-empty"
|
|
#
|
|
substring "abcde", 1, 2, out-ah
|
|
var out/eax: (addr array byte) <- lookup *out-ah
|
|
check-strings-equal out, "bc", "F - test-substring/middle-truncate"
|
|
#
|
|
substring "abcde", 1, 4, out-ah
|
|
var out/eax: (addr array byte) <- lookup *out-ah
|
|
check-strings-equal out, "bcde", "F - test-substring/middle-all"
|
|
#
|
|
substring "abcde", 1, 5, out-ah
|
|
var out/eax: (addr array byte) <- lookup *out-ah
|
|
check-strings-equal out, "bcde", "F - test-substring/middle-too-small"
|
|
}
|
|
|
|
fn split-string in: (addr array byte), delim: grapheme, out: (addr handle array (handle array byte)) {
|
|
var in-stream: (stream byte 0x100)
|
|
var in-stream-addr/esi: (addr stream byte) <- address in-stream
|
|
write in-stream-addr, in
|
|
var tokens-stream: (stream (handle array byte) 0x100)
|
|
var tokens-stream-addr/edi: (addr stream (handle array byte)) <- address tokens-stream
|
|
var curr-stream: (stream byte 0x100)
|
|
var curr-stream-addr/ecx: (addr stream byte) <- address curr-stream
|
|
$split-string:core: {
|
|
var g/eax: grapheme <- read-grapheme in-stream-addr
|
|
compare g, 0xffffffff
|
|
break-if-=
|
|
#? print-grapheme-to-real-screen g
|
|
#? print-string-to-real-screen "\n"
|
|
compare g, delim
|
|
{
|
|
break-if-!=
|
|
# token complete; flush
|
|
var token: (handle array byte)
|
|
var token-ah/eax: (addr handle array byte) <- address token
|
|
stream-to-array curr-stream-addr, token-ah
|
|
write-to-stream tokens-stream-addr, token-ah
|
|
clear-stream curr-stream-addr
|
|
loop $split-string:core
|
|
}
|
|
write-grapheme curr-stream-addr, g
|
|
loop
|
|
}
|
|
stream-to-array tokens-stream-addr, out
|
|
}
|
|
|
|
fn test-split-string {
|
|
var out-h: (handle array (handle array byte))
|
|
var out-ah/edi: (addr handle array (handle array byte)) <- address out-h
|
|
# prefix substrings
|
|
split-string "bab", 0x61, out-ah
|
|
# no crash
|
|
}
|