minetest_x_bows/bin/lua-language-server-3.5.6-l.../script/parser/relabel.lua

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2022-11-03 10:37:33 -05:00
-- $Id: re.lua,v 1.44 2013/03/26 20:11:40 roberto Exp $
-- imported functions and modules
local tonumber, type, print, error = tonumber, type, print, error
local pcall = pcall
local setmetatable = setmetatable
local tinsert, concat = table.insert, table.concat
local rep = string.rep
local m = require"lpeglabel"
-- 'm' will be used to parse expressions, and 'mm' will be used to
-- create expressions; that is, 're' runs on 'm', creating patterns
-- on 'mm'
local mm = m
-- pattern's metatable
local mt = getmetatable(mm.P(0))
-- No more global accesses after this point
_ENV = nil
local any = m.P(1)
local dummy = mm.P(false)
local errinfo = {
NoPatt = "no pattern found",
ExtraChars = "unexpected characters after the pattern",
ExpPatt1 = "expected a pattern after '/'",
ExpPatt2 = "expected a pattern after '&'",
ExpPatt3 = "expected a pattern after '!'",
ExpPatt4 = "expected a pattern after '('",
ExpPatt5 = "expected a pattern after ':'",
ExpPatt6 = "expected a pattern after '{~'",
ExpPatt7 = "expected a pattern after '{|'",
ExpPatt8 = "expected a pattern after '<-'",
ExpPattOrClose = "expected a pattern or closing '}' after '{'",
ExpNumName = "expected a number, '+', '-' or a name (no space) after '^'",
ExpCap = "expected a string, number, '{}' or name after '->'",
ExpName1 = "expected the name of a rule after '=>'",
ExpName2 = "expected the name of a rule after '=' (no space)",
ExpName3 = "expected the name of a rule after '<' (no space)",
ExpLab1 = "expected a label after '{'",
ExpNameOrLab = "expected a name or label after '%' (no space)",
ExpItem = "expected at least one item after '[' or '^'",
MisClose1 = "missing closing ')'",
MisClose2 = "missing closing ':}'",
MisClose3 = "missing closing '~}'",
MisClose4 = "missing closing '|}'",
MisClose5 = "missing closing '}'", -- for the captures
MisClose6 = "missing closing '>'",
MisClose7 = "missing closing '}'", -- for the labels
MisClose8 = "missing closing ']'",
MisTerm1 = "missing terminating single quote",
MisTerm2 = "missing terminating double quote",
}
local function expect (pattern, label)
return pattern + m.T(label)
end
-- Pre-defined names
local Predef = { nl = m.P"\n" }
local mem
local fmem
local gmem
local function updatelocale ()
mm.locale(Predef)
Predef.a = Predef.alpha
Predef.c = Predef.cntrl
Predef.d = Predef.digit
Predef.g = Predef.graph
Predef.l = Predef.lower
Predef.p = Predef.punct
Predef.s = Predef.space
Predef.u = Predef.upper
Predef.w = Predef.alnum
Predef.x = Predef.xdigit
Predef.A = any - Predef.a
Predef.C = any - Predef.c
Predef.D = any - Predef.d
Predef.G = any - Predef.g
Predef.L = any - Predef.l
Predef.P = any - Predef.p
Predef.S = any - Predef.s
Predef.U = any - Predef.u
Predef.W = any - Predef.w
Predef.X = any - Predef.x
mem = {} -- restart memoization
fmem = {}
gmem = {}
local mt = {__mode = "v"}
setmetatable(mem, mt)
setmetatable(fmem, mt)
setmetatable(gmem, mt)
end
updatelocale()
local I = m.P(function (s,i) print(i, s:sub(1, i-1)); return i end)
local function getdef (id, defs)
local c = defs and defs[id]
if not c then
error("undefined name: " .. id)
end
return c
end
local function mult (p, n)
local np = mm.P(true)
while n >= 1 do
if n%2 >= 1 then np = np * p end
p = p * p
n = n/2
end
return np
end
local function equalcap (s, i, c)
if type(c) ~= "string" then return nil end
local e = #c + i
if s:sub(i, e - 1) == c then return e else return nil end
end
local S = (Predef.space + "--" * (any - Predef.nl)^0)^0
local name = m.C(m.R("AZ", "az", "__") * m.R("AZ", "az", "__", "09")^0)
local arrow = S * "<-"
-- a defined name only have meaning in a given environment
local Def = name * m.Carg(1)
local num = m.C(m.R"09"^1) * S / tonumber
local String = "'" * m.C((any - "'" - m.P"\n")^0) * expect("'", "MisTerm1")
+ '"' * m.C((any - '"' - m.P"\n")^0) * expect('"', "MisTerm2")
local defined = "%" * Def / function (c,Defs)
local cat = Defs and Defs[c] or Predef[c]
if not cat then
error("name '" .. c .. "' undefined")
end
return cat
end
local Range = m.Cs(any * (m.P"-"/"") * (any - "]")) / mm.R
local item = defined + Range + m.C(any - m.P"\n")
local Class =
"["
* (m.C(m.P"^"^-1)) -- optional complement symbol
* m.Cf(expect(item, "ExpItem") * (item - "]")^0, mt.__add)
/ function (c, p) return c == "^" and any - p or p end
* expect("]", "MisClose8")
local function adddef (t, k, exp)
if t[k] then
-- TODO 改了一下这里的代码,重复定义不会抛错
--error("'"..k.."' already defined as a rule")
else
t[k] = exp
end
return t
end
local function firstdef (n, r) return adddef({n}, n, r) end
local function NT (n, b)
if not b then
error("rule '"..n.."' used outside a grammar")
else return mm.V(n)
end
end
local exp = m.P{ "Exp",
Exp = S * ( m.V"Grammar"
+ m.Cf(m.V"Seq" * (S * "/" * expect(S * m.V"Seq", "ExpPatt1"))^0, mt.__add) );
Seq = m.Cf(m.Cc(m.P"") * m.V"Prefix" * (S * m.V"Prefix")^0, mt.__mul);
Prefix = "&" * expect(S * m.V"Prefix", "ExpPatt2") / mt.__len
+ "!" * expect(S * m.V"Prefix", "ExpPatt3") / mt.__unm
+ m.V"Suffix";
Suffix = m.Cf(m.V"Primary" *
( S * ( m.P"+" * m.Cc(1, mt.__pow)
+ m.P"*" * m.Cc(0, mt.__pow)
+ m.P"?" * m.Cc(-1, mt.__pow)
+ "^" * expect( m.Cg(num * m.Cc(mult))
+ m.Cg(m.C(m.S"+-" * m.R"09"^1) * m.Cc(mt.__pow)
+ name * m.Cc"lab"
),
"ExpNumName")
+ "->" * expect(S * ( m.Cg((String + num) * m.Cc(mt.__div))
+ m.P"{}" * m.Cc(nil, m.Ct)
+ m.Cg(Def / getdef * m.Cc(mt.__div))
),
"ExpCap")
+ "=>" * expect(S * m.Cg(Def / getdef * m.Cc(m.Cmt)),
"ExpName1")
)
)^0, function (a,b,f) if f == "lab" then return a + mm.T(b) else return f(a,b) end end );
Primary = "(" * expect(m.V"Exp", "ExpPatt4") * expect(S * ")", "MisClose1")
+ String / mm.P
+ Class
+ defined
+ "%" * expect(m.P"{", "ExpNameOrLab")
* expect(S * m.V"Label", "ExpLab1")
* expect(S * "}", "MisClose7") / mm.T
+ "{:" * (name * ":" + m.Cc(nil)) * expect(m.V"Exp", "ExpPatt5")
* expect(S * ":}", "MisClose2")
/ function (n, p) return mm.Cg(p, n) end
+ "=" * expect(name, "ExpName2")
/ function (n) return mm.Cmt(mm.Cb(n), equalcap) end
+ m.P"{}" / mm.Cp
+ "{~" * expect(m.V"Exp", "ExpPatt6")
* expect(S * "~}", "MisClose3") / mm.Cs
+ "{|" * expect(m.V"Exp", "ExpPatt7")
* expect(S * "|}", "MisClose4") / mm.Ct
+ "{" * expect(m.V"Exp", "ExpPattOrClose")
* expect(S * "}", "MisClose5") / mm.C
+ m.P"." * m.Cc(any)
+ (name * -arrow + "<" * expect(name, "ExpName3")
* expect(">", "MisClose6")) * m.Cb("G") / NT;
Label = num + name;
Definition = name * arrow * expect(m.V"Exp", "ExpPatt8");
Grammar = m.Cg(m.Cc(true), "G")
* m.Cf(m.V"Definition" / firstdef * (S * m.Cg(m.V"Definition"))^0,
adddef) / mm.P;
}
local pattern = S * m.Cg(m.Cc(false), "G") * expect(exp, "NoPatt") / mm.P
* S * expect(-any, "ExtraChars")
local function lineno (s, i)
if i == 1 then return 1, 1 end
local adjustment = 0
-- report the current line if at end of line, not the next
if s:sub(i,i) == '\n' then
i = i-1
adjustment = 1
end
local rest, num = s:sub(1,i):gsub("[^\n]*\n", "")
local r = #rest
return 1 + num, (r ~= 0 and r or 1) + adjustment
end
local function calcline (s, i)
if i == 1 then return 1, 1 end
local rest, line = s:sub(1,i):gsub("[^\n]*\n", "")
local col = #rest
return 1 + line, col ~= 0 and col or 1
end
local function splitlines(str)
local t = {}
local function helper(line) tinsert(t, line) return "" end
helper((str:gsub("(.-)\r?\n", helper)))
return t
end
local function compile (p, defs)
if mm.type(p) == "pattern" then return p end -- already compiled
p = p .. " " -- for better reporting of column numbers in errors when at EOF
local ok, cp, label, poserr = pcall(function() return pattern:match(p, 1, defs) end)
if not ok and cp then
if type(cp) == "string" then
cp = cp:gsub("^[^:]+:[^:]+: ", "")
end
error(cp, 3)
end
if not cp then
local lines = splitlines(p)
local line, col = lineno(p, poserr)
local err = {}
tinsert(err, "L" .. line .. ":C" .. col .. ": " .. errinfo[label])
tinsert(err, lines[line])
tinsert(err, rep(" ", col-1) .. "^")
error("syntax error(s) in pattern\n" .. concat(err, "\n"), 3)
end
return cp
end
local function match (s, p, i)
local cp = mem[p]
if not cp then
cp = compile(p)
mem[p] = cp
end
return cp:match(s, i or 1)
end
local function find (s, p, i)
local cp = fmem[p]
if not cp then
cp = compile(p) / 0
cp = mm.P{ mm.Cp() * cp * mm.Cp() + 1 * mm.V(1) }
fmem[p] = cp
end
local i, e = cp:match(s, i or 1)
if i then return i, e - 1
else return i
end
end
local function gsub (s, p, rep)
local g = gmem[p] or {} -- ensure gmem[p] is not collected while here
gmem[p] = g
local cp = g[rep]
if not cp then
cp = compile(p)
cp = mm.Cs((cp / rep + 1)^0)
g[rep] = cp
end
return cp:match(s)
end
-- exported names
local re = {
compile = compile,
match = match,
find = find,
gsub = gsub,
updatelocale = updatelocale,
calcline = calcline
}
return re