126 lines
4.3 KiB
Forth
126 lines
4.3 KiB
Forth
# read up to 'len' code-point-utf8s after skipping the first 'start' ones
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fn substring in: (addr array byte), start: int, len: int, out-ah: (addr handle array byte) {
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var in-stream: (stream byte 0x100)
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var in-stream-addr/esi: (addr stream byte) <- address in-stream
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write in-stream-addr, in
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var out-stream: (stream byte 0x100)
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var out-stream-addr/edi: (addr stream byte) <- address out-stream
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$substring:core: {
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# skip 'start' code-point-utf8s
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var i/eax: int <- copy 0
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{
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compare i, start
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break-if->=
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{
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var dummy/eax: code-point-utf8 <- read-code-point-utf8 in-stream-addr
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compare dummy, 0xffffffff/end-of-file
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break-if-= $substring:core
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}
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i <- increment
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loop
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}
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# copy 'len' code-point-utf8s
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i <- copy 0
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{
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compare i, len
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break-if->=
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{
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var g/eax: code-point-utf8 <- read-code-point-utf8 in-stream-addr
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compare g, 0xffffffff/end-of-file
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break-if-= $substring:core
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write-code-point-utf8 out-stream-addr, g
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}
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i <- increment
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loop
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}
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}
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stream-to-array out-stream-addr, out-ah
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}
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fn test-substring {
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var out-h: (handle array byte)
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var out-ah/edi: (addr handle array byte) <- address out-h
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# prefix substrings
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substring 0, 0, 3, out-ah
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var out/eax: (addr array byte) <- lookup *out-ah
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check-strings-equal out, "", "F - test-substring/null"
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substring "", 0, 3, out-ah
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var out/eax: (addr array byte) <- lookup *out-ah
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#? print-string-to-real-screen out
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#? print-string-to-real-screen "\n"
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check-strings-equal out, "", "F - test-substring/empty"
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#
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substring "abcde", 0, 3, out-ah
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var out/eax: (addr array byte) <- lookup *out-ah
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#? print-string-to-real-screen out
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#? print-string-to-real-screen "\n"
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check-strings-equal out, "abc", "F - test-substring/truncate"
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#
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substring "abcde", 0, 5, out-ah
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var out/eax: (addr array byte) <- lookup *out-ah
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check-strings-equal out, "abcde", "F - test-substring/all"
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#
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substring "abcde", 0, 7, out-ah
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var out/eax: (addr array byte) <- lookup *out-ah
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check-strings-equal out, "abcde", "F - test-substring/too-small"
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# substrings outside string
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substring "abcde", 6, 1, out-ah
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var out/eax: (addr array byte) <- lookup *out-ah
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check-strings-equal out, "", "F - test-substring/start-too-large"
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# trim prefix
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substring "", 2, 3, out-ah
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var out/eax: (addr array byte) <- lookup *out-ah
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check-strings-equal out, "", "F - test-substring/middle-empty"
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#
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substring "abcde", 1, 2, out-ah
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var out/eax: (addr array byte) <- lookup *out-ah
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check-strings-equal out, "bc", "F - test-substring/middle-truncate"
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#
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substring "abcde", 1, 4, out-ah
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var out/eax: (addr array byte) <- lookup *out-ah
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check-strings-equal out, "bcde", "F - test-substring/middle-all"
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#
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substring "abcde", 1, 5, out-ah
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var out/eax: (addr array byte) <- lookup *out-ah
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check-strings-equal out, "bcde", "F - test-substring/middle-too-small"
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}
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fn split-string in: (addr array byte), delim: code-point-utf8, out: (addr handle array (handle array byte)) {
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var in-stream: (stream byte 0x100)
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var in-stream-addr/esi: (addr stream byte) <- address in-stream
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write in-stream-addr, in
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var tokens-stream: (stream (handle array byte) 0x100)
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var tokens-stream-addr/edi: (addr stream (handle array byte)) <- address tokens-stream
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var curr-stream: (stream byte 0x100)
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var curr-stream-addr/ecx: (addr stream byte) <- address curr-stream
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$split-string:core: {
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var g/eax: code-point-utf8 <- read-code-point-utf8 in-stream-addr
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compare g, 0xffffffff
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break-if-=
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#? print-code-point-utf8-to-real-screen g
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#? print-string-to-real-screen "\n"
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compare g, delim
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{
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break-if-!=
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# token complete; flush
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var token: (handle array byte)
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var token-ah/eax: (addr handle array byte) <- address token
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stream-to-array curr-stream-addr, token-ah
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write-to-stream tokens-stream-addr, token-ah
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clear-stream curr-stream-addr
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loop $split-string:core
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}
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write-code-point-utf8 curr-stream-addr, g
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loop
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}
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stream-to-array tokens-stream-addr, out
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}
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fn test-split-string {
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var out-h: (handle array (handle array byte))
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var out-ah/edi: (addr handle array (handle array byte)) <- address out-h
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# prefix substrings
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split-string "bab", 0x61, out-ah
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# no crash
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}
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