diff options
Diffstat (limited to 'lualibs-lpeg.lua')
| -rw-r--r-- | lualibs-lpeg.lua | 36 |
1 files changed, 29 insertions, 7 deletions
diff --git a/lualibs-lpeg.lua b/lualibs-lpeg.lua index 323c73b..99b4bbb 100644 --- a/lualibs-lpeg.lua +++ b/lualibs-lpeg.lua @@ -137,7 +137,7 @@ patterns.nonwhitespace = nonwhitespace local stripper = spacer^0 * C((spacer^0 * nonspacer^1)^0) -- from example by roberto ------ collapser = Cs(spacer^0/"" * ((spacer^1 * P(-1) / "") + (spacer^1/" ") + P(1))^0) +----- collapser = Cs(spacer^0/"" * ((spacer^1 * endofstring / "") + (spacer^1/" ") + P(1))^0) local collapser = Cs(spacer^0/"" * nonspacer^0 * ((spacer^0/" " * nonspacer^1)^0)) patterns.stripper = stripper @@ -187,7 +187,7 @@ patterns.singlequoted = squote * patterns.nosquote * squote patterns.doublequoted = dquote * patterns.nodquote * dquote patterns.quoted = patterns.doublequoted + patterns.singlequoted -patterns.propername = R("AZ","az","__") * R("09","AZ","az", "__")^0 * P(-1) +patterns.propername = R("AZ","az","__") * R("09","AZ","az", "__")^0 * endofstring patterns.somecontent = (anything - newline - space)^1 -- (utf8char - newline - space)^1 patterns.beginline = #(1-newline) @@ -421,7 +421,7 @@ function lpeg.replacer(one,two,makefunction,isutf) -- in principle we should sor end end -function lpeg.finder(lst,makefunction) +function lpeg.finder(lst,makefunction) -- beware: slower than find with 'patternless finds' local pattern if type(lst) == "table" then pattern = P(false) @@ -456,8 +456,8 @@ local splitters_f, splitters_s = { }, { } function lpeg.firstofsplit(separator) -- always return value local splitter = splitters_f[separator] if not splitter then - separator = P(separator) - splitter = C((1 - separator)^0) + local pattern = P(separator) + splitter = C((1 - pattern)^0) splitters_f[separator] = splitter end return splitter @@ -466,13 +466,35 @@ end function lpeg.secondofsplit(separator) -- nil if not split local splitter = splitters_s[separator] if not splitter then - separator = P(separator) - splitter = (1 - separator)^0 * separator * C(anything^0) + local pattern = P(separator) + splitter = (1 - pattern)^0 * pattern * C(anything^0) splitters_s[separator] = splitter end return splitter end +local splitters_s, splitters_p = { }, { } + +function lpeg.beforesuffix(separator) -- nil if nothing but empty is ok + local splitter = splitters_s[separator] + if not splitter then + local pattern = P(separator) + splitter = C((1 - pattern)^0) * pattern * endofstring + splitters_s[separator] = splitter + end + return splitter +end + +function lpeg.afterprefix(separator) -- nil if nothing but empty is ok + local splitter = splitters_p[separator] + if not splitter then + local pattern = P(separator) + splitter = pattern * C(anything^0) + splitters_p[separator] = splitter + end + return splitter +end + function lpeg.balancer(left,right) left, right = P(left), P(right) return P { left * ((1 - left - right) + V(1))^0 * right } |