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author | Karl Berry <karl@freefriends.org> | 2010-05-14 18:32:26 +0000 |
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committer | Karl Berry <karl@freefriends.org> | 2010-05-14 18:32:26 +0000 |
commit | 1d462235e9301d809d6f8b600e52e43481d77fa4 (patch) | |
tree | 7a17cf9c877d60d159e95d7490c0283cb07d37c0 /Master/texmf-dist/tex/luatex/lualibs/lualibs-string.lua | |
parent | 6678cfe21d5566c7ddf935ab80e19e89d30c4603 (diff) |
new package lualibs (13may10)
git-svn-id: svn://tug.org/texlive/trunk@18254 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Master/texmf-dist/tex/luatex/lualibs/lualibs-string.lua')
-rw-r--r-- | Master/texmf-dist/tex/luatex/lualibs/lualibs-string.lua | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/luatex/lualibs/lualibs-string.lua b/Master/texmf-dist/tex/luatex/lualibs/lualibs-string.lua new file mode 100644 index 00000000000..25b8f8e9881 --- /dev/null +++ b/Master/texmf-dist/tex/luatex/lualibs/lualibs-string.lua @@ -0,0 +1,285 @@ +if not modules then modules = { } end modules ['l-string'] = { + version = 1.001, + comment = "companion to luat-lib.mkiv", + author = "Hans Hagen, PRAGMA-ADE, Hasselt NL", + copyright = "PRAGMA ADE / ConTeXt Development Team", + license = "see context related readme files" +} + +local sub, gsub, find, match, gmatch, format, char, byte, rep, lower = string.sub, string.gsub, string.find, string.match, string.gmatch, string.format, string.char, string.byte, string.rep, string.lower +local lpegmatch = lpeg.match + +-- some functions may disappear as they are not used anywhere + +if not string.split then + + -- this will be overloaded by a faster lpeg variant + + function string:split(pattern) + if #self > 0 then + local t = { } + for s in gmatch(self..pattern,"(.-)"..pattern) do + t[#t+1] = s + end + return t + else + return { } + end + end + +end + +local chr_to_esc = { + ["%"] = "%%", + ["."] = "%.", + ["+"] = "%+", ["-"] = "%-", ["*"] = "%*", + ["^"] = "%^", ["$"] = "%$", + ["["] = "%[", ["]"] = "%]", + ["("] = "%(", [")"] = "%)", + ["{"] = "%{", ["}"] = "%}" +} + +string.chr_to_esc = chr_to_esc + +function string:esc() -- variant 2 + return (gsub(self,"(.)",chr_to_esc)) +end + +function string:unquote() + return (gsub(self,"^([\"\'])(.*)%1$","%2")) +end + +--~ function string:unquote() +--~ if find(self,"^[\'\"]") then +--~ return sub(self,2,-2) +--~ else +--~ return self +--~ end +--~ end + +function string:quote() -- we could use format("%q") + return format("%q",self) +end + +function string:count(pattern) -- variant 3 + local n = 0 + for _ in gmatch(self,pattern) do + n = n + 1 + end + return n +end + +function string:limit(n,sentinel) + if #self > n then + sentinel = sentinel or " ..." + return sub(self,1,(n-#sentinel)) .. sentinel + else + return self + end +end + +--~ function string:strip() -- the .- is quite efficient +--~ -- return match(self,"^%s*(.-)%s*$") or "" +--~ -- return match(self,'^%s*(.*%S)') or '' -- posted on lua list +--~ return find(s,'^%s*$') and '' or match(s,'^%s*(.*%S)') +--~ end + +do -- roberto's variant: + local space = lpeg.S(" \t\v\n") + local nospace = 1 - space + local stripper = space^0 * lpeg.C((space^0 * nospace^1)^0) + function string.strip(str) + return lpegmatch(stripper,str) or "" + end +end + +function string:is_empty() + return not find(self,"%S") +end + +function string:enhance(pattern,action) + local ok, n = true, 0 + while ok do + ok = false + self = gsub(self,pattern, function(...) + ok, n = true, n + 1 + return action(...) + end) + end + return self, n +end + +local chr_to_hex, hex_to_chr = { }, { } + +for i=0,255 do + local c, h = char(i), format("%02X",i) + chr_to_hex[c], hex_to_chr[h] = h, c +end + +function string:to_hex() + return (gsub(self or "","(.)",chr_to_hex)) +end + +function string:from_hex() + return (gsub(self or "","(..)",hex_to_chr)) +end + +if not string.characters then + + local function nextchar(str, index) + index = index + 1 + return (index <= #str) and index or nil, sub(str,index,index) + end + function string:characters() + return nextchar, self, 0 + end + local function nextbyte(str, index) + index = index + 1 + return (index <= #str) and index or nil, byte(sub(str,index,index)) + end + function string:bytes() + return nextbyte, self, 0 + end + +end + +-- we can use format for this (neg n) + +function string:rpadd(n,chr) + local m = n-#self + if m > 0 then + return self .. rep(chr or " ",m) + else + return self + end +end + +function string:lpadd(n,chr) + local m = n-#self + if m > 0 then + return rep(chr or " ",m) .. self + else + return self + end +end + +string.padd = string.rpadd + +function is_number(str) -- tonumber + return find(str,"^[%-%+]?[%d]-%.?[%d+]$") == 1 +end + +--~ print(is_number("1")) +--~ print(is_number("1.1")) +--~ print(is_number(".1")) +--~ print(is_number("-0.1")) +--~ print(is_number("+0.1")) +--~ print(is_number("-.1")) +--~ print(is_number("+.1")) + +function string:split_settings() -- no {} handling, see l-aux for lpeg variant + if find(self,"=") then + local t = { } + for k,v in gmatch(self,"(%a+)=([^%,]*)") do + t[k] = v + end + return t + else + return nil + end +end + +local patterns_escapes = { + ["-"] = "%-", + ["."] = "%.", + ["+"] = "%+", + ["*"] = "%*", + ["%"] = "%%", + ["("] = "%)", + [")"] = "%)", + ["["] = "%[", + ["]"] = "%]", +} + +function string:pattesc() + return (gsub(self,".",patterns_escapes)) +end + +local simple_escapes = { + ["-"] = "%-", + ["."] = "%.", + ["?"] = ".", + ["*"] = ".*", +} + +function string:simpleesc() + return (gsub(self,".",simple_escapes)) +end + +function string:tohash() + local t = { } + for s in gmatch(self,"([^, ]+)") do -- lpeg + t[s] = true + end + return t +end + +local pattern = lpeg.Ct(lpeg.C(1)^0) + +function string:totable() + return lpegmatch(pattern,self) +end + +--~ for _, str in ipairs { +--~ "1234567123456712345671234567", +--~ "a\tb\tc", +--~ "aa\tbb\tcc", +--~ "aaa\tbbb\tccc", +--~ "aaaa\tbbbb\tcccc", +--~ "aaaaa\tbbbbb\tccccc", +--~ "aaaaaa\tbbbbbb\tcccccc", +--~ } do print(string.tabtospace(str)) end + +function string.tabtospace(str,tab) + -- we don't handle embedded newlines + while true do + local s = find(str,"\t") + if s then + if not tab then tab = 7 end -- only when found + local d = tab-(s-1) % tab + if d > 0 then + str = gsub(str,"\t",rep(" ",d),1) + else + str = gsub(str,"\t","",1) + end + else + break + end + end + return str +end + +function string:compactlong() -- strips newlines and leading spaces + self = gsub(self,"[\n\r]+ *","") + self = gsub(self,"^ *","") + return self +end + +function string:striplong() -- strips newlines and leading spaces + self = gsub(self,"^%s*","") + self = gsub(self,"[\n\r]+ *","\n") + return self +end + +function string:topattern(lowercase,strict) + if lowercase then + self = lower(self) + end + self = gsub(self,".",simple_escapes) + if self == "" then + self = ".*" + elseif strict then + self = "^" .. self .. "$" + end + return self +end |