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F2730580
regexp.xreate
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Created
Fri, Mar 13, 11:23 PM
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Sun, Mar 15, 11:23 PM (1 d, 16 h)
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rXR Xreate
regexp.xreate
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interface(extern-c){
xml2 = library:: pkgconfig("libxml-2.0").
include {
xml2 = ["string.h"]
}.
}
Matcher = type variant (Sequence, ZeroOrMore, Text).
matchText = function(text::string, matcher::string, posStart::i64):: i64 {
textLength = strlen(text):: i64.
matcherLength = strlen(matcher):: i64.
if(textLength >= posStart + matcherLength):: i64{
if(strncmp(text + posStart, matcher, matcherLength) == 0):: i64 {
matcherLength
} else {-1:: i64}
} else {-2:: i64}
}
matchSequence = function(text::string, pattern::undef; interpretation(force), posStart::i64):: i64; interpretation(suppress){
textLength = length(text):: i64.
loop fold(pattern-> matcher:: undef, posStart->pos):: i64{
recognizedSymbols = match(text, matcher, pos):: i64.
if (recognizedSymbols > 0):: i64{
pos+recognizedSymbols
} else {
pos:: i64; break
}
}
}
matchZeroOrMore= function(text::string, matcher::undef; interpretation(force), posStart::i64):: i64; interpretation(suppress){
textLength = length(text):: i64.
loop fold inf(posStart->pos):: i64{
recognizedSymbols = match(text, matcher, pos):: i64.
if (recognizedSymbols > 0):: i64{
pos+recognizedSymbols
} else {
pos:: i64; break
}
}
}
match = function(text::string, pattern::undef; interpretation(force), posStart::i64)::i64; interpretation(suppress){
switch (pattern[0]) :: int
case (Sequence) {matchSequence(text, pattern[1], posStart)}
case (ZeroOrMore) {matchZeroOrMore(text, pattern[1], posStart)}
case (Text) {matchText(text, pattern[1], posStart)}
case default {-1}
}
main = function:: i64; entry {
patternAB =
[Sequence,
[[ZeroOrMore, [Text, "a"]],
[Text, "b"]]] :: undef; interpretation(force).
// matchers = ["The ", "only ", "way "] :: [string]; interpretation(force).
match("aaab", patternAB, 0):: i64
}
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