From 5684a0743e65ecb5ee3bd60a085df45479b0d39e Mon Sep 17 00:00:00 2001
From: Philipp Gesang <phg42.2a@gmail.com>
Date: Thu, 11 Apr 2013 15:14:11 +0200
Subject: add util-prs
---
lualibs-util-prs.lua | 562 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 562 insertions(+)
create mode 100644 lualibs-util-prs.lua
diff --git a/lualibs-util-prs.lua b/lualibs-util-prs.lua
new file mode 100644
index 0000000..31e7ffa
--- /dev/null
+++ b/lualibs-util-prs.lua
@@ -0,0 +1,562 @@
+if not modules then modules = { } end modules ['util-prs'] = {
+ 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 lpeg, table, string = lpeg, table, string
+local P, R, V, S, C, Ct, Cs, Carg, Cc, Cg, Cf, Cp = lpeg.P, lpeg.R, lpeg.V, lpeg.S, lpeg.C, lpeg.Ct, lpeg.Cs, lpeg.Carg, lpeg.Cc, lpeg.Cg, lpeg.Cf, lpeg.Cp
+local lpegmatch, lpegpatterns = lpeg.match, lpeg.patterns
+local concat, format, gmatch, find = table.concat, string.format, string.gmatch, string.find
+local tostring, type, next, rawset = tostring, type, next, rawset
+
+utilities = utilities or {}
+local parsers = utilities.parsers or { }
+utilities.parsers = parsers
+local patterns = parsers.patterns or { }
+parsers.patterns = patterns
+
+local setmetatableindex = table.setmetatableindex
+local sortedhash = table.sortedhash
+
+-- we share some patterns
+
+local digit = R("09")
+local space = P(' ')
+local equal = P("=")
+local comma = P(",")
+local lbrace = P("{")
+local rbrace = P("}")
+local lparent = P("(")
+local rparent = P(")")
+local period = S(".")
+local punctuation = S(".,:;")
+local spacer = lpegpatterns.spacer
+local whitespace = lpegpatterns.whitespace
+local newline = lpegpatterns.newline
+local anything = lpegpatterns.anything
+local endofstring = lpegpatterns.endofstring
+
+local nobrace = 1 - ( lbrace + rbrace )
+local noparent = 1 - ( lparent + rparent)
+
+-- we could use a Cf Cg construct
+
+local escape, left, right = P("\\"), P('{'), P('}')
+
+lpegpatterns.balanced = P {
+ [1] = ((escape * (left+right)) + (1 - (left+right)) + V(2))^0,
+ [2] = left * V(1) * right
+}
+
+local nestedbraces = P { lbrace * (nobrace + V(1))^0 * rbrace }
+local nestedparents = P { lparent * (noparent + V(1))^0 * rparent }
+local spaces = space^0
+local argument = Cs((lbrace/"") * ((nobrace + nestedbraces)^0) * (rbrace/""))
+local content = (1-endofstring)^0
+
+lpegpatterns.nestedbraces = nestedbraces -- no capture
+lpegpatterns.nestedparents = nestedparents -- no capture
+lpegpatterns.nested = nestedbraces -- no capture
+lpegpatterns.argument = argument -- argument after e.g. =
+lpegpatterns.content = content -- rest after e.g =
+
+local value = P(lbrace * C((nobrace + nestedbraces)^0) * rbrace) + C((nestedbraces + (1-comma))^0)
+
+local key = C((1-equal-comma)^1)
+local pattern_a = (space+comma)^0 * (key * equal * value + key * C(""))
+local pattern_c = (space+comma)^0 * (key * equal * value)
+
+local key = C((1-space-equal-comma)^1)
+local pattern_b = spaces * comma^0 * spaces * (key * ((spaces * equal * spaces * value) + C("")))
+
+-- "a=1, b=2, c=3, d={a{b,c}d}, e=12345, f=xx{a{b,c}d}xx, g={}" : outer {} removes, leading spaces ignored
+
+-- todo: rewrite to fold etc
+--
+-- parse = lpeg.Cf(lpeg.Carg(1) * lpeg.Cg(key * equal * value) * separator^0,rawset)^0 -- lpeg.match(parse,"...",1,hash)
+
+local hash = { }
+
+local function set(key,value)
+ hash[key] = value
+end
+
+local pattern_a_s = (pattern_a/set)^1
+local pattern_b_s = (pattern_b/set)^1
+local pattern_c_s = (pattern_c/set)^1
+
+patterns.settings_to_hash_a = pattern_a_s
+patterns.settings_to_hash_b = pattern_b_s
+patterns.settings_to_hash_c = pattern_c_s
+
+function parsers.make_settings_to_hash_pattern(set,how)
+ if how == "strict" then
+ return (pattern_c/set)^1
+ elseif how == "tolerant" then
+ return (pattern_b/set)^1
+ else
+ return (pattern_a/set)^1
+ end
+end
+
+function parsers.settings_to_hash(str,existing)
+ if str and str ~= "" then
+ hash = existing or { }
+ lpegmatch(pattern_a_s,str)
+ return hash
+ else
+ return { }
+ end
+end
+
+function parsers.settings_to_hash_tolerant(str,existing)
+ if str and str ~= "" then
+ hash = existing or { }
+ lpegmatch(pattern_b_s,str)
+ return hash
+ else
+ return { }
+ end
+end
+
+function parsers.settings_to_hash_strict(str,existing)
+ if str and str ~= "" then
+ hash = existing or { }
+ lpegmatch(pattern_c_s,str)
+ return next(hash) and hash
+ else
+ return nil
+ end
+end
+
+local separator = comma * space^0
+local value = P(lbrace * C((nobrace + nestedbraces)^0) * rbrace)
+ + C((nestedbraces + (1-comma))^0)
+local pattern = spaces * Ct(value*(separator*value)^0)
+
+-- "aap, {noot}, mies" : outer {} removes, leading spaces ignored
+
+patterns.settings_to_array = pattern
+
+-- we could use a weak table as cache
+
+function parsers.settings_to_array(str,strict)
+ if not str or str == "" then
+ return { }
+ elseif strict then
+ if find(str,"{") then
+ return lpegmatch(pattern,str)
+ else
+ return { str }
+ end
+ else
+ return lpegmatch(pattern,str)
+ end
+end
+
+local function set(t,v)
+ t[#t+1] = v
+end
+
+local value = P(Carg(1)*value) / set
+local pattern = value*(separator*value)^0 * Carg(1)
+
+function parsers.add_settings_to_array(t,str)
+ return lpegmatch(pattern,str,nil,t)
+end
+
+function parsers.hash_to_string(h,separator,yes,no,strict,omit)
+ if h then
+ local t, tn, s = { }, 0, table.sortedkeys(h)
+ omit = omit and table.tohash(omit)
+ for i=1,#s do
+ local key = s[i]
+ if not omit or not omit[key] then
+ local value = h[key]
+ if type(value) == "boolean" then
+ if yes and no then
+ if value then
+ tn = tn + 1
+ t[tn] = key .. '=' .. yes
+ elseif not strict then
+ tn = tn + 1
+ t[tn] = key .. '=' .. no
+ end
+ elseif value or not strict then
+ tn = tn + 1
+ t[tn] = key .. '=' .. tostring(value)
+ end
+ else
+ tn = tn + 1
+ t[tn] = key .. '=' .. value
+ end
+ end
+ end
+ return concat(t,separator or ",")
+ else
+ return ""
+ end
+end
+
+function parsers.array_to_string(a,separator)
+ if a then
+ return concat(a,separator or ",")
+ else
+ return ""
+ end
+end
+
+function parsers.settings_to_set(str,t) -- tohash? -- todo: lpeg -- duplicate anyway
+ t = t or { }
+-- for s in gmatch(str,"%s*([^, ]+)") do -- space added
+ for s in gmatch(str,"[^, ]+") do -- space added
+ t[s] = true
+ end
+ return t
+end
+
+function parsers.simple_hash_to_string(h, separator)
+ local t, tn = { }, 0
+ for k, v in sortedhash(h) do
+ if v then
+ tn = tn + 1
+ t[tn] = k
+ end
+ end
+ return concat(t,separator or ",")
+end
+
+-- for chem (currently one level)
+
+local value = P(lbrace * C((nobrace + nestedbraces)^0) * rbrace)
+ + C(digit^1 * lparent * (noparent + nestedparents)^1 * rparent)
+ + C((nestedbraces + (1-comma))^1)
+local pattern_a = spaces * Ct(value*(separator*value)^0)
+
+local function repeater(n,str)
+ if not n then
+ return str
+ else
+ local s = lpegmatch(pattern_a,str)
+ if n == 1 then
+ return unpack(s)
+ else
+ local t, tn = { }, 0
+ for i=1,n do
+ for j=1,#s do
+ tn = tn + 1
+ t[tn] = s[j]
+ end
+ end
+ return unpack(t)
+ end
+ end
+end
+
+local value = P(lbrace * C((nobrace + nestedbraces)^0) * rbrace)
+ + (C(digit^1)/tonumber * lparent * Cs((noparent + nestedparents)^1) * rparent) / repeater
+ + C((nestedbraces + (1-comma))^1)
+local pattern_b = spaces * Ct(value*(separator*value)^0)
+
+function parsers.settings_to_array_with_repeat(str,expand) -- beware: "" => { }
+ if expand then
+ return lpegmatch(pattern_b,str) or { }
+ else
+ return lpegmatch(pattern_a,str) or { }
+ end
+end
+
+--
+
+local value = lbrace * C((nobrace + nestedbraces)^0) * rbrace
+local pattern = Ct((space + value)^0)
+
+function parsers.arguments_to_table(str)
+ return lpegmatch(pattern,str)
+end
+
+-- temporary here (unoptimized)
+
+function parsers.getparameters(self,class,parentclass,settings)
+ local sc = self[class]
+ if not sc then
+ sc = { }
+ self[class] = sc
+ if parentclass then
+ local sp = self[parentclass]
+ if not sp then
+ sp = { }
+ self[parentclass] = sp
+ end
+ setmetatableindex(sc,sp)
+ end
+ end
+ parsers.settings_to_hash(settings,sc)
+end
+
+function parsers.listitem(str)
+ return gmatch(str,"[^, ]+")
+end
+
+--
+
+local pattern = Cs { "start",
+ start = V("one") + V("two") + V("three"),
+ rest = (Cc(",") * V("thousand"))^0 * (P(".") + endofstring) * anything^0,
+ thousand = digit * digit * digit,
+ one = digit * V("rest"),
+ two = digit * digit * V("rest"),
+ three = V("thousand") * V("rest"),
+}
+
+lpegpatterns.splitthousands = pattern -- maybe better in the parsers namespace ?
+
+function parsers.splitthousands(str)
+ return lpegmatch(pattern,str) or str
+end
+
+-- print(parsers.splitthousands("11111111111.11"))
+
+local optionalwhitespace = whitespace^0
+
+lpegpatterns.words = Ct((Cs((1-punctuation-whitespace)^1) + anything)^1)
+lpegpatterns.sentences = Ct((optionalwhitespace * Cs((1-period)^0 * period))^1)
+lpegpatterns.paragraphs = Ct((optionalwhitespace * Cs((whitespace^1*endofstring/"" + 1 - (spacer^0*newline*newline))^1))^1)
+
+-- local str = " Word1 word2. \n Word3 word4. \n\n Word5 word6.\n "
+-- inspect(lpegmatch(lpegpatterns.paragraphs,str))
+-- inspect(lpegmatch(lpegpatterns.sentences,str))
+-- inspect(lpegmatch(lpegpatterns.words,str))
+
+-- handy for k="v" [, ] k="v"
+
+local dquote = P('"')
+local equal = P('=')
+local escape = P('\\')
+local separator = S(' ,')
+
+local key = C((1-equal)^1)
+local value = dquote * C((1-dquote-escape*dquote)^0) * dquote
+
+local pattern = Cf(Ct("") * Cg(key * equal * value) * separator^0,rawset)^0 * P(-1)
+
+patterns.keq_to_hash_c = pattern
+
+function parsers.keq_to_hash(str)
+ if str and str ~= "" then
+ return lpegmatch(pattern,str)
+ else
+ return { }
+ end
+end
+
+-- inspect(lpeg.match(pattern,[[key="value"]]))
+
+local defaultspecification = { separator = ",", quote = '"' }
+
+-- this version accepts multiple separators and quotes as used in the
+-- database module
+
+function parsers.csvsplitter(specification)
+ specification = specification and table.setmetatableindex(specification,defaultspecification) or defaultspecification
+ local separator = specification.separator
+ local quotechar = specification.quote
+ local separator = S(separator ~= "" and separator or ",")
+ local whatever = C((1 - separator - newline)^0)
+ if quotechar and quotechar ~= "" then
+ local quotedata = nil
+ for chr in gmatch(quotechar,".") do
+ local quotechar = P(chr)
+ local quoteword = quotechar * C((1 - quotechar)^0) * quotechar
+ if quotedata then
+ quotedata = quotedata + quoteword
+ else
+ quotedata = quoteword
+ end
+ end
+ whatever = quotedata + whatever
+ end
+ local parser = Ct((Ct(whatever * (separator * whatever)^0) * S("\n\r"))^0 )
+ return function(data)
+ return lpegmatch(parser,data)
+ end
+end
+
+-- and this is a slightly patched version of a version posted by Philipp Gesang
+
+-- local mycsvsplitter = utilities.parsers.rfc4180splitter()
+--
+-- local crap = [[
+-- first,second,third,fourth
+-- "1","2","3","4"
+-- "a","b","c","d"
+-- "foo","bar""baz","boogie","xyzzy"
+-- ]]
+--
+-- local list, names = mycsvsplitter(crap,true) inspect(list) inspect(names)
+-- local list, names = mycsvsplitter(crap) inspect(list) inspect(names)
+
+function parsers.rfc4180splitter(specification)
+ specification = specification and table.setmetatableindex(specification,defaultspecification) or defaultspecification
+ local separator = specification.separator --> rfc: COMMA
+ local quotechar = P(specification.quote) --> DQUOTE
+ local dquotechar = quotechar * quotechar --> 2DQUOTE
+ / specification.quote
+ local separator = S(separator ~= "" and separator or ",")
+ local escaped = quotechar
+ * Cs((dquotechar + (1 - quotechar))^0)
+ * quotechar
+ local non_escaped = C((1 - quotechar - newline - separator)^1)
+ local field = escaped + non_escaped
+ local record = Ct((field * separator^-1)^1)
+ local headerline = record * Cp()
+ local wholeblob = Ct((newline^-1 * record)^0)
+ return function(data,getheader)
+ if getheader then
+ local header, position = lpegmatch(headerline,data)
+ local data = lpegmatch(wholeblob,data,position)
+ return data, header
+ else
+ return lpegmatch(wholeblob,data)
+ end
+ end
+end
+
+-- utilities.parsers.stepper("1,7-",9,function(i) print(">>>",i) end)
+-- utilities.parsers.stepper("1-3,7,8,9")
+-- utilities.parsers.stepper("1-3,6,7",function(i) print(">>>",i) end)
+-- utilities.parsers.stepper(" 1 : 3, ,7 ")
+-- utilities.parsers.stepper("1:4,9:13,24:*",30)
+
+local function ranger(first,last,n,action)
+ if not first then
+ -- forget about it
+ elseif last == true then
+ for i=first,n or first do
+ action(i)
+ end
+ elseif last then
+ for i=first,last do
+ action(i)
+ end
+ else
+ action(first)
+ end
+end
+
+local cardinal = lpegpatterns.cardinal / tonumber
+local spacers = lpegpatterns.spacer^0
+local endofstring = lpegpatterns.endofstring
+
+local stepper = spacers * ( C(cardinal) * ( spacers * S(":-") * spacers * ( C(cardinal) + Cc(true) ) + Cc(false) )
+ * Carg(1) * Carg(2) / ranger * S(", ")^0 )^1
+
+local stepper = spacers * ( C(cardinal) * ( spacers * S(":-") * spacers * ( C(cardinal) + (P("*") + endofstring) * Cc(true) ) + Cc(false) )
+ * Carg(1) * Carg(2) / ranger * S(", ")^0 )^1 * endofstring -- we're sort of strict (could do without endofstring)
+
+function parsers.stepper(str,n,action)
+ if type(n) == "function" then
+ lpegmatch(stepper,str,1,false,n or print)
+ else
+ lpegmatch(stepper,str,1,n,action or print)
+ end
+end
+
+--
+
+local pattern_math = Cs((P("%")/"\\percent " + P("^") * Cc("{") * lpegpatterns.integer * Cc("}") + P(1))^0)
+local pattern_text = Cs((P("%")/"\\percent " + (P("^")/"\\high") * Cc("{") * lpegpatterns.integer * Cc("}") + P(1))^0)
+
+patterns.unittotex = pattern
+
+function parsers.unittotex(str,textmode)
+ return lpegmatch(textmode and pattern_text or pattern_math,str)
+end
+
+local pattern = Cs((P("^") / "<sup>" * lpegpatterns.integer * Cc("</sup>") + P(1))^0)
+
+function parsers.unittoxml(str)
+ return lpegmatch(pattern,str)
+end
+
+-- print(utilities.parsers.unittotex("10^-32 %"),utilities.parsers.unittoxml("10^32 %"))
+
+local cache = { }
+local spaces = lpeg.patterns.space^0
+local dummy = function() end
+
+table.setmetatableindex(cache,function(t,k)
+ local separator = P(k)
+ local value = (1-separator)^0
+ local pattern = spaces * C(value) * separator^0 * Cp()
+ t[k] = pattern
+ return pattern
+end)
+
+local commalistiterator = cache[","]
+
+function utilities.parsers.iterator(str,separator)
+ local n = #str
+ if n == 0 then
+ return dummy
+ else
+ local pattern = separator and cache[separator] or commalistiterator
+ local p = 1
+ return function()
+ if p <= n then
+ local s, e = lpegmatch(pattern,str,p)
+ if e then
+ p = e
+ return s
+ end
+ end
+ end
+ end
+end
+
+-- for s in utilities.parsers.iterator("a b c,b,c") do
+-- print(s)
+-- end
+
+local function initialize(t,name)
+ local source = t[name]
+ if source then
+ local result = { }
+ for k, v in next, t[name] do
+ result[k] = v
+ end
+ return result
+ else
+ return { }
+ end
+end
+
+local function fetch(t,name)
+ return t[name] or { }
+end
+
+function process(result,more)
+ for k, v in next, more do
+ result[k] = v
+ end
+ return result
+end
+
+local name = C((1-S(", "))^1)
+local parser = (Carg(1) * name / initialize) * (S(", ")^1 * (Carg(1) * name / fetch))^0
+local merge = Cf(parser,process)
+
+function utilities.parsers.mergehashes(hash,list)
+ return lpegmatch(merge,list,1,hash)
+end
+
+-- local t = {
+-- aa = { alpha = 1, beta = 2, gamma = 3, },
+-- bb = { alpha = 4, beta = 5, delta = 6, },
+-- cc = { epsilon = 3 },
+-- }
+--
+-- inspect(utilities.parsers.mergehashes(t,"aa, bb, cc"))
--
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