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https://github.com/janet-lang/janet
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peg replacement functions have access to captures
When peg/replace or peg/replace-all are given a function to serve as the text replacement, any captures produced by the PEG are passed as additional arguments to that function.
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@ -1738,7 +1738,7 @@ static Janet cfun_peg_replace_generic(int32_t argc, Janet *argv, int only_one) {
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trail = i;
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}
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int32_t nexti = (int32_t)(result - c.bytes.bytes);
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JanetByteView subst = janet_text_substitution(&c.subst, c.bytes.bytes + i, nexti - i);
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JanetByteView subst = janet_text_substitution(&c.subst, c.bytes.bytes + i, nexti - i, c.s.captures);
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janet_buffer_push_bytes(ret, subst.bytes, subst.len);
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trail = nexti;
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if (nexti == i) nexti++;
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@ -1758,8 +1758,8 @@ JANET_CORE_FN(cfun_peg_replace_all,
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"(peg/replace-all peg subst text &opt start & args)",
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"Replace all matches of `peg` in `text` with `subst`, returning a new buffer. "
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"The peg does not need to make captures to do replacement. "
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"If `subst` is a function, it will be called once for each match "
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"and should return the actual replacement text to use.") {
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"If `subst` is a function, it will be called with the "
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"matching text followed by any captures.") {
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return cfun_peg_replace_generic(argc, argv, 0);
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}
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@ -1767,8 +1767,8 @@ JANET_CORE_FN(cfun_peg_replace,
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"(peg/replace peg repl text &opt start & args)",
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"Replace first match of `peg` in `text` with `subst`, returning a new buffer. "
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"The peg does not need to make captures to do replacement. "
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"If `subst` is a function, it will be called with the matching text, "
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"and should return the actual replacement text to use. "
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"If `subst` is a function, it will be called with the "
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"matching text followed by any captures. "
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"If no matches are found, returns the input string in a new buffer.") {
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return cfun_peg_replace_generic(argc, argv, 1);
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}
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@ -397,7 +397,7 @@ JANET_CORE_FN(cfun_string_replace,
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kmp_deinit(&s.kmp);
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return janet_stringv(s.kmp.text, s.kmp.textlen);
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}
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JanetByteView subst = janet_text_substitution(&s.subst, s.kmp.text + result, s.kmp.patlen);
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JanetByteView subst = janet_text_substitution(&s.subst, s.kmp.text + result, s.kmp.patlen, NULL);
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buf = janet_string_begin(s.kmp.textlen - s.kmp.patlen + subst.len);
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safe_memcpy(buf, s.kmp.text, result);
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safe_memcpy(buf + result, subst.bytes, subst.len);
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@ -422,7 +422,7 @@ JANET_CORE_FN(cfun_string_replaceall,
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replacesetup(argc, argv, &s);
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janet_buffer_init(&b, s.kmp.textlen);
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while ((result = kmp_next(&s.kmp)) >= 0) {
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JanetByteView subst = janet_text_substitution(&s.subst, s.kmp.text + result, s.kmp.patlen);
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JanetByteView subst = janet_text_substitution(&s.subst, s.kmp.text + result, s.kmp.patlen, NULL);
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janet_buffer_push_bytes(&b, s.kmp.text + lastindex, result - lastindex);
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janet_buffer_push_bytes(&b, subst.bytes, subst.len);
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lastindex = result + s.kmp.patlen;
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@ -688,19 +688,32 @@ static JanetByteView to_byte_view(Janet value) {
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return result;
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}
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JanetByteView janet_text_substitution(Janet *subst, const uint8_t *bytes, uint32_t len) {
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switch (janet_type(*subst)) {
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case JANET_CFUNCTION: {
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Janet matched = janet_stringv(bytes, len);
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return to_byte_view(janet_unwrap_cfunction(*subst)(1, &matched));
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}
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case JANET_FUNCTION: {
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Janet matched = janet_stringv(bytes, len);
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return to_byte_view(janet_call(janet_unwrap_function(*subst), 1, &matched));
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}
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default:
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return memoize_byte_view(subst);
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}
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JanetByteView janet_text_substitution(
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Janet *subst,
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const uint8_t *bytes,
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uint32_t len,
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JanetArray *extra_argv) {
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int32_t extra_argc = extra_argv == NULL ? 0 : extra_argv->count;
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JanetType type = janet_type(*subst);
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switch (type) {
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case JANET_FUNCTION:
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case JANET_CFUNCTION: {
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int32_t argc = 1 + extra_argc;
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Janet *argv = janet_tuple_begin(argc);
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argv[0] = janet_stringv(bytes, len);
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for (int32_t i = 0; i < extra_argc; i++) {
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argv[i + 1] = extra_argv->data[i];
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}
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janet_tuple_end(argv);
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if (type == JANET_FUNCTION) {
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return to_byte_view(janet_call(janet_unwrap_function(*subst), argc, argv));
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} else {
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return to_byte_view(janet_unwrap_cfunction(*subst)(argc, argv));
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}
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}
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default:
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return memoize_byte_view(subst);
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}
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}
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JanetBinding janet_resolve_ext(JanetTable *env, const uint8_t *sym) {
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@ -93,7 +93,11 @@ void janet_buffer_format(
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Janet *argv);
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Janet janet_next_impl(Janet ds, Janet key, int is_interpreter);
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JanetBinding janet_binding_from_entry(Janet entry);
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JanetByteView janet_text_substitution(Janet *subst, const uint8_t *bytes, uint32_t len);
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JanetByteView janet_text_substitution(
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Janet *subst,
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const uint8_t *bytes,
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uint32_t len,
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JanetArray *extra_args);
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/* Registry functions */
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void janet_registry_put(
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@ -340,6 +340,7 @@ neldb\0\0\0\xD8\x05printG\x01\0\xDE\xDE\xDE'\x03\0marshal_tes/\x02
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(check-replacer "aba" "" "ababababababa")
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(check-replacer "aba" string/ascii-upper "ababababababa")
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(check-replacer "aba" 123 "ababababababa")
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(assert (= (string (peg/replace-all ~(set "ab") string/ascii-upper "abcaa"))
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"ABcAA")
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"peg/replace-all cfunction")
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@ -347,6 +348,23 @@ neldb\0\0\0\xD8\x05printG\x01\0\xDE\xDE\xDE'\x03\0marshal_tes/\x02
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"abcaa")
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"peg/replace-all function")
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(defn peg-test [name f peg subst text expected]
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(assert (= (string (f peg subst text)) expected) name))
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(peg-test "peg/replace has access to captures"
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peg/replace
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~(sequence "." (capture (set "ab")))
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(fn [str char] (string/format "%s -> %s, " str (string/ascii-upper char)))
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".a.b.c"
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".a -> A, .b.c")
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(peg-test "peg/replace-all has access to captures"
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peg/replace-all
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~(sequence "." (capture (set "ab")))
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(fn [str char] (string/format "%s -> %s, " str (string/ascii-upper char)))
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".a.b.c"
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".a -> A, .b -> B, .c")
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# Peg bug
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(assert (deep= @[] (peg/match '(any 1) @"")) "peg empty pattern 1")
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(assert (deep= @[] (peg/match '(any 1) (buffer))) "peg empty pattern 2")
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