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pp.lua
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327 lines (307 loc) · 8.98 KB
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--[[
This module impements a pretty printer to the AST
]]
local pp = {}
local block2str, stm2str, exp2str, var2str
local explist2str, varlist2str, parlist2str, fieldlist2str
local function iscntrl (x)
if (x >= 0 and x <= 31) or (x == 127) then return true end
return false
end
local function isprint (x)
return not iscntrl(x)
end
local function fixed_string (str)
local new_str = ""
for i=1,string.len(str) do
char = string.byte(str, i)
if char == 34 then new_str = new_str .. string.format("\\\"")
elseif char == 92 then new_str = new_str .. string.format("\\\\")
elseif char == 7 then new_str = new_str .. string.format("\\a")
elseif char == 8 then new_str = new_str .. string.format("\\b")
elseif char == 12 then new_str = new_str .. string.format("\\f")
elseif char == 10 then new_str = new_str .. string.format("\\n")
elseif char == 13 then new_str = new_str .. string.format("\\r")
elseif char == 9 then new_str = new_str .. string.format("\\t")
elseif char == 11 then new_str = new_str .. string.format("\\v")
else
if isprint(char) then
new_str = new_str .. string.format("%c", char)
else
new_str = new_str .. string.format("\\%03d", char)
end
end
end
return new_str
end
local function name2str (name)
return string.format('"%s"', name)
end
local function boolean2str (b)
return string.format('"%s"', tostring(b))
end
local function number2str (n)
return string.format('"%s"', tostring(n))
end
local function string2str (s)
return string.format('"%s"', fixed_string(s))
end
function var2str (var)
local tag = var.tag
local str = "`" .. tag
if tag == "Id" then -- `Id{ <string> }
str = str .. " " .. name2str(var[1])
elseif tag == "Index" then -- `Index{ expr expr }
str = str .. "{ "
str = str .. exp2str(var[1]) .. ", "
str = str .. exp2str(var[2])
str = str .. " }"
else
error("expecting a variable, but got a " .. tag)
end
return str
end
function varlist2str (varlist)
local l = {}
for k, v in ipairs(varlist) do
l[k] = var2str(v)
end
return "{ " .. table.concat(l, ", ") .. " }"
end
function parlist2str (parlist)
local l = {}
local len = #parlist
local is_vararg = false
if len > 0 and parlist[len].tag == "Dots" then
is_vararg = true
len = len - 1
end
local i = 1
while i <= len do
l[i] = var2str(parlist[i])
i = i + 1
end
if is_vararg then
l[i] = "`" .. parlist[i].tag
end
return "{ " .. table.concat(l, ", ") .. " }"
end
function fieldlist2str (fieldlist)
local l = {}
for k, v in ipairs(fieldlist) do
local tag = v.tag
if tag == "Pair" then -- `Pair{ expr expr }
l[k] = "`" .. tag .. "{ "
l[k] = l[k] .. exp2str(v[1]) .. ", " .. exp2str(v[2])
l[k] = l[k] .. " }"
else -- expr
l[k] = exp2str(v)
end
end
if #l > 0 then
return "{ " .. table.concat(l, ", ") .. " }"
else
return ""
end
end
function exp2str (exp)
local tag = exp.tag
local str = "`" .. tag
if tag == "Nil" or
tag == "Dots" then
elseif tag == "Boolean" then -- `Boolean{ <boolean> }
str = str .. " " .. boolean2str(exp[1])
elseif tag == "Number" then -- `Number{ <number> }
str = str .. " " .. number2str(exp[1])
elseif tag == "String" then -- `String{ <string> }
str = str .. " " .. string2str(exp[1])
elseif tag == "Function" then -- `Function{ { `Id{ <string> }* `Dots? } block }
str = str .. "{ "
str = str .. parlist2str(exp[1]) .. ", "
str = str .. block2str(exp[2])
str = str .. " }"
elseif tag == "Table" then -- `Table{ ( `Pair{ expr expr } | expr )* }
str = str .. fieldlist2str(exp)
elseif tag == "Op" then -- `Op{ opid expr expr? }
str = str .. "{ "
str = str .. name2str(exp[1]) .. ", "
str = str .. exp2str(exp[2])
if exp[3] then
str = str .. ", " .. exp2str(exp[3])
end
str = str .. " }"
elseif tag == "Paren" then -- `Paren{ expr }
str = str .. "{ " .. exp2str(exp[1]) .. " }"
elseif tag == "Call" then -- `Call{ expr expr* }
str = str .. "{ "
str = str .. exp2str(exp[1])
if exp[2] then
for i=2, #exp do
str = str .. ", " .. exp2str(exp[i])
end
end
str = str .. " }"
elseif tag == "Invoke" then -- `Invoke{ expr `String{ <string> } expr* }
str = str .. "{ "
str = str .. exp2str(exp[1]) .. ", "
str = str .. exp2str(exp[2])
if exp[3] then
for i=3, #exp do
str = str .. ", " .. exp2str(exp[i])
end
end
str = str .. " }"
elseif tag == "Id" or -- `Id{ <string> }
tag == "Index" then -- `Index{ expr expr }
str = var2str(exp)
else
error("expecting an expression, but got a " .. tag)
end
return str
end
function explist2str (explist)
local l = {}
for k, v in ipairs(explist) do
l[k] = exp2str(v)
end
if #l > 0 then
return "{ " .. table.concat(l, ", ") .. " }"
else
return ""
end
end
function stm2str (stm)
local tag = stm.tag
local str = "`" .. tag
if tag == "Do" then -- `Do{ stat* }
local l = {}
for k, v in ipairs(stm) do
l[k] = stm2str(v)
end
str = str .. "{ " .. table.concat(l, ", ") .. " }"
elseif tag == "Set" then -- `Set{ {lhs+} {expr+} }
str = str .. "{ "
str = str .. varlist2str(stm[1]) .. ", "
str = str .. explist2str(stm[2])
str = str .. " }"
elseif tag == "While" then -- `While{ expr block }
str = str .. "{ "
str = str .. exp2str(stm[1]) .. ", "
str = str .. block2str(stm[2])
str = str .. " }"
elseif tag == "Repeat" then -- `Repeat{ block expr }
str = str .. "{ "
str = str .. block2str(stm[1]) .. ", "
str = str .. exp2str(stm[2])
str = str .. " }"
elseif tag == "If" then -- `If{ (expr block)+ block? }
str = str .. "{ "
local len = #stm
if len % 2 == 0 then
local l = {}
for i=1,len-2,2 do
str = str .. exp2str(stm[i]) .. ", " .. block2str(stm[i+1]) .. ", "
end
str = str .. exp2str(stm[len-1]) .. ", " .. block2str(stm[len])
else
local l = {}
for i=1,len-3,2 do
str = str .. exp2str(stm[i]) .. ", " .. block2str(stm[i+1]) .. ", "
end
str = str .. exp2str(stm[len-2]) .. ", " .. block2str(stm[len-1]) .. ", "
str = str .. block2str(stm[len])
end
str = str .. " }"
elseif tag == "Fornum" then -- `Fornum{ ident expr expr expr? block }
str = str .. "{ "
str = str .. var2str(stm[1]) .. ", "
str = str .. exp2str(stm[2]) .. ", "
str = str .. exp2str(stm[3]) .. ", "
if stm[5] then
str = str .. exp2str(stm[4]) .. ", "
str = str .. block2str(stm[5])
else
str = str .. block2str(stm[4])
end
str = str .. " }"
elseif tag == "Forin" then -- `Forin{ {ident+} {expr+} block }
str = str .. "{ "
str = str .. varlist2str(stm[1]) .. ", "
str = str .. explist2str(stm[2]) .. ", "
str = str .. block2str(stm[3])
str = str .. " }"
elseif tag == "Local" then -- `Local{ {ident+} {expr+}? }
str = str .. "{ "
str = str .. varlist2str(stm[1])
if #stm[2] > 0 then
str = str .. ", " .. explist2str(stm[2])
else
str = str .. ", " .. "{ }"
end
str = str .. " }"
elseif tag == "Localrec" then -- `Localrec{ ident expr }
str = str .. "{ "
str = str .. "{ " .. var2str(stm[1][1]) .. " }, "
str = str .. "{ " .. exp2str(stm[2][1]) .. " }"
str = str .. " }"
elseif tag == "Goto" or -- `Goto{ <string> }
tag == "Label" then -- `Label{ <string> }
str = str .. "{ " .. name2str(stm[1]) .. " }"
elseif tag == "Return" then -- `Return{ <expr>* }
str = str .. explist2str(stm)
elseif tag == "Break" then
elseif tag == "Call" then -- `Call{ expr expr* }
str = str .. "{ "
str = str .. exp2str(stm[1])
if stm[2] then
for i=2, #stm do
str = str .. ", " .. exp2str(stm[i])
end
end
str = str .. " }"
elseif tag == "Invoke" then -- `Invoke{ expr `String{ <string> } expr* }
str = str .. "{ "
str = str .. exp2str(stm[1]) .. ", "
str = str .. exp2str(stm[2])
if stm[3] then
for i=3, #stm do
str = str .. ", " .. exp2str(stm[i])
end
end
str = str .. " }"
else
error("expecting a statement, but got a " .. tag)
end
return str
end
function block2str (block)
local l = {}
for k, v in ipairs(block) do
l[k] = stm2str(v)
end
return "{ " .. table.concat(l, ", ") .. " }"
end
function pp.tostring (t)
assert(type(t) == "table")
return block2str(t)
end
function pp.print (t)
assert(type(t) == "table")
print(pp.tostring(t))
end
function pp.dump (t, i)
if i == nil then i = 0 end
io.write(string.format("{\n"))
io.write(string.format("%s[tag] = %s\n", string.rep(" ", i+2), t.tag or "nil"))
io.write(string.format("%s[pos] = %s\n", string.rep(" ", i+2), t.pos or "nil"))
for k,v in ipairs(t) do
io.write(string.format("%s[%s] = ", string.rep(" ", i+2), tostring(k)))
if type(v) == "table" then
pp.dump(v,i+2)
else
io.write(string.format("%s\n", tostring(v)))
end
end
io.write(string.format("%s}\n", string.rep(" ", i)))
end
return pp