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l7801.lua
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#!/usr/bin/env lua
local function lookupify(tb, dst, not_val)
if not dst then dst = tb end
local val = not not_val
for _, v in pairs(tb) do
dst[v] = val
end
return tb
end
local WhiteChars = lookupify{' ', '\n', '\t', '\r'}
local Spaces = lookupify{' ', '\t'}
local EscapeLookup = {['\r'] = '\\r', ['\n'] = '\\n', ['\t'] = '\\t', ['"'] = '\\"', ["'"] = "\\'"}
local LowerChars = lookupify{'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r',
's', 't', 'u', 'v', 'w', 'x', 'y', 'z'}
local UpperChars = lookupify{'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',
'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'}
local Digits = lookupify{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'}
local HexDigits = lookupify{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'a', 'B', 'b', 'C', 'c', 'D', 'd', 'E', 'e', 'F', 'f'}
local BinDigits = lookupify{'0', '1'}
local Symbols = lookupify{'+', '-', '*', '/', '^', '%', ',', '{', '}', '[', ']', '(', ')', ';', '#', '&', '|', '!'}
local Keywords = lookupify{
'and', 'break', 'do', 'else', 'elseif',
'end', 'false', 'for', 'function', 'goto', 'if',
'in', 'local', 'nil', 'not', 'or', 'repeat',
'return', 'then', 'true', 'until', 'while',
};
local Keywords_control = {
}
local Keywords_data = {
'dc',
}
local Keywords_7801 = {
'aci','adi','adinc','ani','bit0','bit1','bit2','bit3',
'bit4','bit5','bit6','bit7','block','calb','calf','call',
'calt','clc','ei','eqi','eqiw','daa','di','dcr',
'dcrw','dcx','ex','exx','gti','halt','in','inr','inrw',
'inx','jb','jmp','jr','jre','ldaw','ldax','ldaxd',
'ldaxi','lti','lxi','mov','mvi','mviw','mvix','nei',
'nop','offi','oni','ori','out','pen','per','pex','pop','push','ret',
'reti','rets','rld','rll','rlr','rrd','sbi','sio','skc',
'skit','sknit','skz','sknc','sknz','sll','slr','softi',
'staw','stax','staxd','staxi','stc','stm','sui','suinb',
'table','xri',
'ana','xra','ora','addnc','gta','subnb','lta','add','adc','sub','nea','sbb','eqa',
'ona','offa',
'anaw','xraw','oraw','addncw','gtaw','subnbw','ltaw','addw','onaw','adcw','offaw','subw','neaw','sbbw','eqaw',
'sspd','lspd','sbcd','lbcd','sded','lded','shld','lhld',
'anax','xrax','orax','addncx','gtax','subnbx','ltax','addx','onax','adcx','offax','subx','neax','sbbx','eqax',
'anaxi','xraxi','oraxi','addncxi','gtaxi','subnbxi','ltaxi','addxi','onaxi','adcxi','offaxi','subxi','neaxi','sbbxi','eqaxi',
'anaxd','xraxd','oraxd','addncxd','gtaxd','subnbxd','ltaxd','addxd','onaxd','adcxd','offaxd','subxd','neaxd','sbbxd','eqaxd',
}
local Registers_7801 = {
a=8,b=8,c=8,d=8,e=8,h=8,l=8,v=8,
bc=16,de=16,hl=16,sp=16,va=16,
pa=8,pb=8,pc=8,mk=8,mb=8,mc=8,tm0=8,tm1=8,s=8,
}
local Interrupts_7801 = lookupify{
'f0','ft','f1','f2','fs'
}
local function syntax7801(on)
syntax7801_on = on
lookupify(Keywords_control, Keywords, not on)
lookupify(Keywords_data, Keywords, not on)
lookupify(Keywords_7801, Keywords, not on)
end
syntax7801(true)
local opcode_arg_encapsulate_on
local function opcode_arg_encapsulate(on)
opcode_arg_encapsulate_on = not opcode_arg_encapsulate_on
end
opcode_arg_encapsulate(true)
local opcode_encapsulate = {} -- additionnal opcode, to have basic encapsulation (function(a) return a end)
local opcode_alias = {} -- alternate user names for opcodes
local opcode_implied = lookupify{
'block','calb','clc','ei','daa','dcr','di','ex','exx','halt','inr','jb','nop','pen',
'per','pex','ret','reti','rets','rld','rrd','sio','skc','skz','sknc','sknz','softi',
'stc','stm','table'
}
local opcode_immediate = lookupify{
'calf','calt','call','in','jmp','out',
}
local opcode_wa = lookupify{
'inrw','ldaw','dcrw','staw',
'bit0','bit1','bit2','bit3','bit4','bit5','bit6','bit7',
'anaw','xraw','oraw','addncw','gtaw','subnbw','ltaw','addw','onaw','adcw','offaw','subw','neaw','sbbw','eqaw',
}
local opcode_wab = lookupify{
'mviw','eqiw'
}
local opcode_relative = lookupify{
'jr','jre'
}
local opcode_reg = lookupify{
'dcr','dcx','inr','inx','pop','push','rll','rlr','sll','slr',
}
local opcode_mov = lookupify{
'mov'
}
local opcode_reg_reg = lookupify{
'ana','xra','ora','addnc','gta','subnb','lta','add','adc','sub','nea','sbb','eqa','ona','offa'
}
local opcode_regb = lookupify{
'aci','adi','adinc','ani','eqi','gti','lti','mvi','nei','offi','oni','ori','sbi','sui','suinb','xri',
}
local opcode_reg_ind = lookupify{
'ldax','ldaxd','ldaxi',
'stax','staxd','staxi',
'anax','xrax','orax','addncx','gtax','subnbx','ltax','addx','onax','adcx','offax','subx','neax','sbbx','eqax',
'anaxi','xraxi','oraxi','addncxi','gtaxi','subnbxi','ltaxi','addxi','onaxi','adcxi','offaxi','subxi','neaxi','sbbxi','eqaxi',
'anaxd','xraxd','oraxd','addncxd','gtaxd','subnbxd','ltaxd','addxd','onaxd','adcxd','offaxd','subxd','neaxd','sbbxd','eqaxd',
}
local opcode_reg_ind_ex = lookupify{
'mvix'
}
local opcode_regw = lookupify{
'lxi'
}
local opcode_timer = lookupify{
'skit','sknit',
}
local opcode_ind = lookupify{
'sspd','lspd','sbcd','lbcd','sded','lded','shld','lhld',
}
local opcode_reg_list = {
a = lookupify{'aci','adi','adinc','ani','dcr','inr','eqi','gti','lti','mvi','nei','offi','oni','ori','rll','rlr','sbi','sll','slr','sui','suinb','xri'},
b = lookupify{'ani','xri','ori','adinc','gti','suinb','lti','adi','oni','aci','offi','sui','nei','sbi','eqi','dcr','inr','mvi'},
c = lookupify{'ani','xri','ori','adinc','gti','suinb','lti','adi','oni','aci','offi','sui','nei','sbi','eqi','dcr','inr','mvi','rll','rlr','sll','slr'},
d = lookupify{'ani','xri','ori','adinc','gti','suinb','lti','adi','oni','aci','offi','sui','nei','sbi','eqi','mvi'},
e = lookupify{'ani','xri','ori','adinc','gti','suinb','lti','adi','oni','aci','offi','sui','nei','sbi','eqi','mvi'},
h = lookupify{'ani','xri','ori','adinc','gti','suinb','lti','adi','oni','aci','offi','sui','nei','sbi','eqi','mvi'},
l = lookupify{'ani','xri','ori','adinc','gti','suinb','lti','adi','oni','aci','offi','sui','nei','sbi','eqi','mvi'},
v = lookupify{'ani','xri','ori','adinc','gti','suinb','lti','adi','oni','aci','offi','sui','nei','sbi','eqi',
'inrw','ldaw','dcrw','eqiw','mvi','mviw','staw',
'bit0','bit1','bit2','bit3','bit4','bit5','bit6','bit7',
'anaw','xraw','oraw','addncw','gtaw','subnbw','ltaw','addw','onaw','adcw','offaw','subw','neaw','sbbw','eqaw',
},
bc = lookupify{
'ldax','lxi','mvix','pop','push','stax',
'anax','xrax','orax','addncx','gtax','subnbx','ltax','addx','onax','adcx','offax','subx','neax','sbbx','eqax',
},
de = lookupify{
'ldax','ldaxd','ldaxi','lxi','mvix','pop','push','stax','staxd','staxi',
'anax','xrax','orax','addncx','gtax','subnbx','ltax','addx','onax','adcx','offax','subx','neax','sbbx','eqax',
'anaxi','xraxi','oraxi','addncxi','gtaxi','subnbxi','ltaxi','addxi','onaxi','adcxi','offaxi','subxi','neaxi','sbbxi','eqaxi',
'anaxd','xraxd','oraxd','addncxd','gtaxd','subnbxd','ltaxd','addxd','onaxd','adcxd','offaxd','subxd','neaxd','sbbxd','eqaxd',
},
hl = lookupify{
'dcx','inx','ldax','ldaxd','ldaxi','lxi','mvix','pop','push','stax','staxd','staxi',
'anax','xrax','orax','addncx','gtax','subnbx','ltax','addx','onax','adcx','offax','subx','neax','sbbx','eqax',
'anaxi','xraxi','oraxi','addncxi','gtaxi','subnbxi','ltaxi','addxi','onaxi','adcxi','offaxi','subxi','neaxi','sbbxi','eqaxi',
'anaxd','xraxd','oraxd','addncxd','gtaxd','subnbxd','ltaxd','addxd','onaxd','adcxd','offaxd','subxd','neaxd','sbbxd','eqaxd',
},
sp = lookupify{'dcx','inx','lxi'},
va = lookupify{'pop','push'},
pa = lookupify{'ani','xri','ori','adinc','gti','suinb','lti','adi','oni','aci','offi','sui','nei','sbi','eqi'},
pb = lookupify{'ani','xri','ori','adinc','gti','suinb','lti','adi','oni','aci','offi','sui','nei','sbi','eqi'},
pc = lookupify{'ani','xri','ori','adinc','gti','suinb','lti','adi','oni','aci','offi','sui','nei','sbi','eqi'},
mk = lookupify{'ani','xri','ori','adinc','gti','suinb','lti','adi','oni','aci','offi','sui','nei','sbi','eqi'},
}
local opcode_reg_reg_list = {
a = {
a = lookupify{'ana','xra','ora','addnc','gta','subnb','lta','add','adc','sub','nea','sbb','eqa','ona','offa'},
b = lookupify{'mov','ana','xra','ora','addnc','gta','subnb','lta','add','','adc','','sub','nea','sbb','eqa','ona','offa'},
c = lookupify{'mov','ana','xra','ora','addnc','gta','subnb','lta','add','','adc','','sub','nea','sbb','eqa','ona','offa'},
d = lookupify{'mov','ana','xra','ora','addnc','gta','subnb','lta','add','','adc','','sub','nea','sbb','eqa','ona','offa'},
e = lookupify{'mov','ana','xra','ora','addnc','gta','subnb','lta','add','','adc','','sub','nea','sbb','eqa','ona','offa'},
h = lookupify{'mov','ana','xra','ora','addnc','gta','subnb','lta','add','','adc','','sub','nea','sbb','eqa','ona','offa'},
l = lookupify{'mov','ana','xra','ora','addnc','gta','subnb','lta','add','','adc','','sub','nea','sbb','eqa','ona','offa'},
v = lookupify{'ana','xra','ora','addnc','gta','subnb','lta','add','','adc','','sub','nea','sbb','eqa','ona','offa'},
pa = lookupify{'mov'},
pb = lookupify{'mov'},
pc = lookupify{'mov'},
mk = lookupify{'mov'},
mb = lookupify{'mov'},
mc = lookupify{'mov'},
tm0 = lookupify{'mov'},
tm1 = lookupify{'mov'},
s = lookupify{'mov'},
},
v = { a = lookupify{'ana','xra','ora','addnc','gta','subnb','lta','add','adc','sub','nea','sbb','eqa'} },
b = { a = lookupify{'mov','ana','xra','ora','addnc','gta','subnb','lta','add','adc','sub','nea','sbb','eqa'} },
c = { a = lookupify{'mov','ana','xra','ora','addnc','gta','subnb','lta','add','adc','sub','nea','sbb','eqa'} },
d = { a = lookupify{'mov','ana','xra','ora','addnc','gta','subnb','lta','add','adc','sub','nea','sbb','eqa'} },
e = { a = lookupify{'mov','ana','xra','ora','addnc','gta','subnb','lta','add','adc','sub','nea','sbb','eqa'} },
h = { a = lookupify{'mov','ana','xra','ora','addnc','gta','subnb','lta','add','adc','sub','nea','sbb','eqa'} },
l = { a = lookupify{'mov','ana','xra','ora','addnc','gta','subnb','lta','add','adc','sub','nea','sbb','eqa'} },
pa = { a = lookupify{'mov'} },
pb = { a = lookupify{'mov'} },
pc = { a = lookupify{'mov'} },
mk = { a = lookupify{'mov'} },
mb = { a = lookupify{'mov'} },
mc = { a = lookupify{'mov'} },
tm0 = { a = lookupify{'mov'} },
tm1 = { a = lookupify{'mov'} },
s = { a = lookupify{'mov'} },
}
local registers_8 = lookupify {'v','a','b','c','d','e','h','l'}
local register_names = {'v','a','b','c','d','e','h','l'}
local addressing_map = {
imp = opcode_implied,
wa = opcode_wa,
wab = opcode_wab,
imm = opcode_immediate,
rel = opcode_relative,
reg = opcode_reg,
regb = opcode_regb,
regw = opcode_regw,
reg_ind = opcode_reg_ind,
reg_ind_ex = opcode_reg_ind_ex,
timer=opcode_timer,
}
local Scope = {
new = function(self, parent)
local s = {
Parent = parent,
Locals = { },
Globals = { },
Children = { },
}
if parent then
table.insert(parent.Children, s)
end
return setmetatable(s, { __index = self })
end,
AddLocal = function(self, v)
table.insert(self.Locals, v)
end,
AddGlobal = function(self, v)
table.insert(self.Globals, v)
end,
CreateLocal = function(self, name)
local v
v = self:GetLocal(name)
if v then return v end
v = { }
v.Scope = self
v.Name = name
v.IsGlobal = false
self:AddLocal(v)
return v
end,
GetLocal = function(self, name)
for k, var in pairs(self.Locals) do
if var.Name == name then return var end
end
if self.Parent then
return self.Parent:GetLocal(name)
end
end,
CreateGlobal = function(self, name)
local v
v = self:GetGlobal(name)
if v then return v end
v = { }
v.Scope = self
v.Name = name
v.IsGlobal = true
self:AddGlobal(v)
return v
end,
GetGlobal = function(self, name)
for k, v in pairs(self.Globals) do
if v.Name == name then return v end
end
if self.Parent then
return self.Parent:GetGlobal(name)
end
end,
}
local function LexLua(src)
--token dump
local tokens = {}
local st, err = pcall(function()
--line / char / pointer tracking
local p = 1
local line = 1
local char = 1
--get / peek functions
local function get()
local c = src:sub(p,p)
if c == '\n' then
char = 1
line = line + 1
else
char = char + 1
end
p = p + 1
return c
end
local function get_n(count) for i=1,count do get() end end
local function peek(n)
n = n or 0
return src:sub(p+n,p+n)
end
local function peek_n(sz) return src:sub(p, p+sz-1) end
local function consume(chars)
local c = peek()
for i = 1, #chars do
if c == chars:sub(i,i) then return get() end
end
end
local function get_word(spaces)
if not spaces then spaces = Spaces end
local c
repeat get() c = peek() until not spaces[c]
local start = p
repeat get() c = peek() until not (UpperChars[c] or LowerChars[c] or Digits[c] or c == '_')
return src:sub(start, p-1)
end
local function peek_ident(i, spaces)
if not spaces then spaces = Spaces end
local c
while true do c=peek(i) if not spaces[c] then break end i=i+1 end
if not (UpperChars[c] or LowerChars[c] or c == '_') then return end
local start = p+i
repeat i=i+1 c = peek(i) until not (UpperChars[c] or LowerChars[c] or Digits[c] or c == '_')
return src:sub(start, p+i-1),i,c
end
--shared stuff
local function generateError(err)
return error(">> :"..line..":"..char..": "..err, 0)
end
local function tryGetLongString()
local start = p
if peek() == '[' then
local equalsCount = 0
local depth = 1
while peek(equalsCount+1) == '=' do
equalsCount = equalsCount + 1
end
if peek(equalsCount+1) == '[' then
--start parsing the string. Strip the starting bit
for _ = 0, equalsCount+1 do get() end
--get the contents
local contentStart = p
while true do
--check for eof
if peek() == '' then
generateError("Expected ']"..string.rep('=', equalsCount).."]' near <eof>.", 3)
end
--check for the end
local foundEnd = true
if peek() == ']' then
for i = 1, equalsCount do
if peek(i) ~= '=' then foundEnd = false end
end
if peek(equalsCount+1) ~= ']' then
foundEnd = false
end
else
--[[
if peek() == '[' then
-- is there an embedded long string?
local embedded = true
for i = 1, equalsCount do
if peek(i) ~= '=' then
embedded = false
break
end
end
if peek(equalsCount + 1) == '[' and embedded then
-- oh look, there was
depth = depth + 1
for i = 1, (equalsCount + 2) do
get()
end
end
end
]]
foundEnd = false
end
--
if foundEnd then
depth = depth - 1
if depth == 0 then
break
else
for i = 1, equalsCount + 2 do
get()
end
end
else
get()
end
end
--get the interior string
local contentString = src:sub(contentStart, p-1)
--found the end. Get rid of the trailing bit
for i = 0, equalsCount+1 do get() end
--get the exterior string
local longString = src:sub(start, p-1)
--return the stuff
return contentString, longString
else
return nil
end
else
return nil
end
end
--main token emitting loop
while true do
--get leading whitespace. The leading whitespace will include any comments
--preceding the token. This prevents the parser needing to deal with comments
--separately.
local leading = { }
local leadingWhite = ''
local longStr = false
while true do
local c = peek()
if c == '#' and peek(1) == '!' and line == 1 then
-- #! shebang for linux scripts
get()
get()
leadingWhite = "#!"
while peek() ~= '\n' and peek() ~= '' do
leadingWhite = leadingWhite .. get()
end
local token = {
Type = 'Comment',
CommentType = 'Shebang',
Data = leadingWhite,
Line = line,
Char = char
}
token.Print = function()
return "<"..(token.Type .. string.rep(' ', 7-#token.Type)).." "..(token.Data or '').." >"
end
leadingWhite = ""
table.insert(leading, token)
end
if c == ' ' or c == '\t' then
--whitespace
--leadingWhite = leadingWhite..get()
local c2 = get() -- ignore whitespace
table.insert(leading, { Type = 'Whitespace', Line = line, Char = char, Data = c2 })
elseif c == '\n' or c == '\r' then
local nl = get()
if leadingWhite ~= "" then
local token = {
Type = 'Comment',
CommentType = longStr and 'LongComment' or 'Comment',
Data = leadingWhite,
Line = line,
Char = char,
}
token.Print = function()
return "<"..(token.Type .. string.rep(' ', 7-#token.Type)).." "..(token.Data or '').." >"
end
table.insert(leading, token)
leadingWhite = ""
end
table.insert(leading, { Type = 'Whitespace', Line = line, Char = char, Data = nl })
elseif c == '-' and peek(1) == '-' then
--comment
get()
get()
leadingWhite = leadingWhite .. '--'
local _, wholeText = tryGetLongString()
if wholeText then
leadingWhite = leadingWhite..wholeText
longStr = true
else
while peek() ~= '\n' and peek() ~= '' do
leadingWhite = leadingWhite..get()
end
end
else
break
end
end
if leadingWhite ~= "" then
local token = {
Type = 'Comment',
CommentType = longStr and 'LongComment' or 'Comment',
Data = leadingWhite,
Line = line,
Char = char,
}
token.Print = function()
return "<"..(token.Type .. string.rep(' ', 7-#token.Type)).." "..(token.Data or '').." >"
end
table.insert(leading, token)
end
--get the initial char
local thisLine = line
local thisChar = char
local errorAt = ":"..line..":"..char..":> "
local c = peek()
--symbol to emit
local toEmit = nil
--pragma
if char == 1 and peek_n(7) == '#pragma' then
get_n(7)
local dat,opt = get_word()
local onoff = function(f, noerr)
opt = get_word()
if opt == 'on' then f(true)
elseif opt == 'off' then f(false)
elseif not noerr then generateError("invalid option for pragma " .. dat .. ", expected: [on,off]")
end
return opt
end
if dat == 'encapsulate' then
local opcode = onoff(function() end, true)
if opcode then
opcode_encapsulate[opcode] = get_word()
table.insert(Keywords_7801, opcode)
Keywords[opcode] = syntax7801_on
toEmit = {Type = 'Symbol', Data = ';'}
else
toEmit = {Type = 'Keyword', Data = 'encapsulate_' .. opt}
end
elseif dat == 'add_opcode' then
local opcode,addressing = get_word(),get_word()
local map = addressing_map[addressing]
if not map then generateError("invalid addressing for pragma add_opcode: " .. addressing .. " (opcode: " .. opcode .. ")") end
map[opcode] = true
table.insert(Keywords_7801, opcode)
Keywords[opcode] = syntax7801_on
toEmit = {Type = 'Symbol', Data = ';'}
elseif dat == 'alias' then
local org,new = get_word(),get_word()
opcode_alias[new] = org
table.insert(Keywords_7801, new)
Keywords[new] = syntax7801_on
toEmit = {Type = 'Symbol', Data = ';'}
else generateError("unknown pragma: " .. dat)
end
--branch on type
elseif c == '' then
--eof
toEmit = { Type = 'Eof' }
elseif UpperChars[c] or LowerChars[c] or c == '_' then
--ident or keyword
local start = p
repeat
get()
c = peek()
until not (UpperChars[c] or LowerChars[c] or Digits[c] or c == '_')
local dat = src:sub(start, p-1)
if Keywords[dat] then
toEmit = {Type = 'Keyword', Data = dat}
else
toEmit = {Type = 'Ident', Data = dat}
end
elseif Digits[c] or (peek() == '.' and Digits[peek(1)]) then
--number const
local start = p
local data_override
if c == '0' and peek(1) == 'x' then
get();get()
while HexDigits[peek()] do get() end
if consume('Pp') then
consume('+-')
while Digits[peek()] do get() end
end
elseif c == '0' and peek(1) == 'b' then
get();get()
while BinDigits[peek()] do get() end
local pstart, val_s, val = p, src:sub(start+2, p-1), 0
for i=1,#val_s do
if val_s:sub(i,i) == '1' then val = val + (1<<(#val_s-i)) end
end
if consume('Pp') then
consume('+-')
while Digits[peek()] do get() end
end
data_override = val .. src:sub(pstart, p-1)
else
while Digits[peek()] do get() end
if consume('.') then
while Digits[peek()] do get() end
end
if consume('Ee') then
consume('+-')
while Digits[peek()] do get() end
end
end
toEmit = {Type = 'Number', Data = data_override or src:sub(start, p-1)}
elseif c == '\'' or c == '\"' then
local start = p
--string const
local delim = get()
local contentStart = p
while true do
local c = get()
if c == '\\' then
get() --get the escape char
elseif c == delim then
break
elseif c == '' then
generateError("Unfinished string near <eof>")
end
end
local content = src:sub(contentStart, p-2)
local constant = src:sub(start, p-1)
toEmit = {Type = 'String', Data = constant, Constant = content}
elseif c == '[' then
local content, wholetext = tryGetLongString()
if wholetext then
toEmit = {Type = 'String', Data = wholetext, Constant = content}
else
get()
toEmit = {Type = 'Symbol', Data = '['}
end
elseif c == '<' and peek(1) == c then
get() get()
toEmit = {Type = 'Symbol', Data = '<<'}
elseif c == '>' and peek(1) == c then
get() get()
toEmit = {Type = 'Symbol', Data = '>>'}
elseif consume('>=<') then
toEmit = {Type = 'Symbol', Data = consume('=') and c..'=' or c}
elseif consume('~') then
toEmit = {Type = 'Symbol', Data = consume('=') and '~=' or '~'}
elseif consume('.') then
if consume('.') then
if consume('.') then
toEmit = {Type = 'Symbol', Data = '...'}
else
toEmit = {Type = 'Symbol', Data = '..'}
end
else
toEmit = {Type = 'Symbol', Data = '.'}
end
elseif consume(':') then
toEmit = {Type = 'Symbol', Data = consume(':') and '::' or ':'}
elseif consume('/') then
toEmit = {Type = 'Symbol', Data = consume('/') and '//' or '/'}
elseif syntax7801_on and consume('@') then
if consume('@') then
toEmit = {Type = 'Symbol', Data = '@@'}
else
toEmit = {Type = 'Symbol', Data = '@'}
end
elseif syntax7801_on and consume('\\') then
toEmit = {Type = 'Symbol', Data = '\\'}
elseif Symbols[c] then
get()
toEmit = {Type = 'Symbol', Data = c}
else
local contents, all = tryGetLongString()
if contents then
toEmit = {Type = 'String', Data = all, Constant = contents}
else
generateError("Unexpected Symbol '"..c.."' in source.", 2)
end
end
if toEmit[1] then
toEmit[1].LeadingWhite = leading
for k,v in ipairs(toEmit) do
v.Line = thisLine
v.Char = thisChar
v.Print = function()
return "<"..(v.Type..string.rep(' ', 7-#v.Type)).." "..(v.Data or '').." >"
end
tokens[#tokens+1] = v
end
else
--add the emitted symbol, after adding some common data
toEmit.LeadingWhite = leading -- table of leading whitespace/comments
--for k, tok in pairs(leading) do
-- tokens[#tokens + 1] = tok
--end
toEmit.Line = thisLine
toEmit.Char = thisChar
toEmit.Print = function()
return "<"..(toEmit.Type..string.rep(' ', 7-#toEmit.Type)).." "..(toEmit.Data or '').." >"
end
tokens[#tokens+1] = toEmit
--halt after eof has been emitted
if toEmit.Type == 'Eof' then break end
end
end
end)
if not st then
return false, err
end
--public interface:
local tok = {}
local savedP = {}
local p = 1
function tok:getp()
return p
end
function tok:setp(n)
p = n
end
function tok:getTokenList()
return tokens
end
--getters
function tok:Peek(n)
n = n or 0
return tokens[math.min(#tokens, p+n)]
end
function tok:Get(tokenList)
local t = tokens[p]
p = math.min(p + 1, #tokens)
if tokenList then
table.insert(tokenList, t)
end
return t
end
function tok:Is(t)
return tok:Peek().Type == t
end
--save / restore points in the stream
function tok:Save()
savedP[#savedP+1] = p
end
function tok:Commit()
savedP[#savedP] = nil
end
function tok:Restore()
p = savedP[#savedP]
savedP[#savedP] = nil
end
--either return a symbol if there is one, or return true if the requested
--symbol was gotten.
function tok:ConsumeSymbol(symb, tokenList)
local t = self:Peek()
if t.Type == 'Symbol' then
if symb then
if t.Data == symb then
self:Get(tokenList)
return true
else
return nil
end
else
self:Get(tokenList)
return t
end
else
return nil
end
end
function tok:ConsumeKeyword(kw, tokenList)
local t = self:Peek()
if t.Type == 'Keyword' and t.Data == kw then
self:Get(tokenList)
return true
else
return nil
end
end
function tok:IsKeyword(kw)
local t = tok:Peek()
return t.Type == 'Keyword' and t.Data == kw
end
function tok:IsSymbol(s)
local t = tok:Peek()
return t.Type == 'Symbol' and t.Data == s
end
function tok:IsEof()
return tok:Peek().Type == 'Eof'
end
return true, tok
end
local function ParseLua(src, src_name)
local st, tok
if type(src) ~= 'table' then
st, tok = LexLua(src)
else
st, tok = true, src
end
if not st then
return false, tok
end
--
local function GenerateError(msg)
local err = (src_name or '=(string)') .. ":"..tok:Peek().Line..":"..tok:Peek().Char..": "..msg.."\n "
--find the line
local lineNum = 0
if type(src) == 'string' then
for line in src:gmatch("[^\n]*\n?") do
if line:sub(-1,-1) == '\n' then line = line:sub(1,-2) end
lineNum = lineNum+1
if lineNum == tok:Peek().Line then
err = err..line:gsub('\t',' ').."\n"
for i = 1, tok:Peek().Char do
local c = line:sub(i,i)
if c == '\t' then
err = err..' '
else
err = err..' '
end
end
err = err.."^^^^"
break
end
end
end
return err
end
--
local VarUid = 0
local function CreateScope(parent)
local scope = Scope:new(parent)
scope.Print = function() return "<Scope>" end
return scope
end
local ParseExpr
local ParseStatementList
local ParseSimpleExpr,
ParseSubExpr,
ParsePrimaryExpr,
ParseSuffixedExpr
local function ParseFunctionArgsAndBody(scope, tokenList)
local funcScope = CreateScope(scope)
if not tok:ConsumeSymbol('(', tokenList) then
return false, GenerateError("'(' expected")
end
--arg list
local argList = {}
local isVarArg = false
while not tok:ConsumeSymbol(')', tokenList) do
if tok:Is('Ident') then
local arg = funcScope:CreateLocal(tok:Get(tokenList).Data)
argList[#argList+1] = arg
if not tok:ConsumeSymbol(',', tokenList) then
if tok:ConsumeSymbol(')', tokenList) then
break
else
return false, GenerateError("')' expected")
end
end
elseif tok:ConsumeSymbol('...', tokenList) then
isVarArg = true
if not tok:ConsumeSymbol(')', tokenList) then
return false, GenerateError("'...' must be the last argument of a function")
end
break
else
return false, GenerateError("Argument name or '...' expected")
end
end
--body
local st, body = ParseStatementList(funcScope)
if not st then return false, body end
--end
if not tok:ConsumeKeyword('end', tokenList) then
return false, GenerateError("'end' expected after function body")
end
local nodeFunc = {}
nodeFunc.AstType = 'Function'
nodeFunc.Scope = funcScope
nodeFunc.Arguments = argList
nodeFunc.Body = body
nodeFunc.VarArg = isVarArg
nodeFunc.Tokens = tokenList
--
return true, nodeFunc
end
function ParsePrimaryExpr(scope)
local tokenList = {}
if tok:ConsumeSymbol('(', tokenList) then
local st, ex = ParseExpr(scope)
if not st then return false, ex end
if not tok:ConsumeSymbol(')', tokenList) then
return false, GenerateError("')' expected")
end
if false then
--save the information about parenthesized expressions somewhere
ex.ParenCount = (ex.ParenCount or 0) + 1
return true, ex
else
local parensExp = {}
parensExp.AstType = 'Parentheses'
parensExp.Inner = ex
parensExp.Tokens = tokenList
return true, parensExp
end
elseif tok:Is('Ident') then
local id = tok:Get(tokenList)
local var = scope:GetLocal(id.Data)
if not var then
var = scope:GetGlobal(id.Data)
if not var then
var = scope:CreateGlobal(id.Data)
end
end
--
local nodePrimExp = {}
nodePrimExp.AstType = 'VarExpr'
nodePrimExp.Name = id.Data
nodePrimExp.Variable = var
nodePrimExp.Tokens = tokenList
--
return true, nodePrimExp
else
return false, GenerateError("Primary expression expected")
end
end
function ParseSuffixedExpr(scope, onlyDotColon)
--base primary expression
local st, prim = ParsePrimaryExpr(scope)
if not st then return false, prim end
--
while true do
local tokenList = {}
if tok:IsSymbol('.') or tok:IsSymbol(':') then
local symb = tok:Get(tokenList).Data
if not tok:Is('Ident') then
return false, GenerateError("Identifier expected")
end
local id = tok:Get(tokenList)
local nodeIndex = {}
nodeIndex.AstType = 'MemberExpr'
nodeIndex.Base = prim
nodeIndex.Indexer = symb
nodeIndex.Ident = id
nodeIndex.Tokens = tokenList
--
prim = nodeIndex