286 lines
6.2 KiB
Lua
286 lines
6.2 KiB
Lua
--[[
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ast.lua - Generates a structure for use in preprocessing.
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]]
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-- This Source Code Form is subject to the terms of the Mozilla Public
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-- License, v. 2.0. If a copy of the MPL was not distributed with this
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-- file, You can obtain one at https://mozilla.org/MPL/2.0/.
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local function nextc(f, c)
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c = c or 1
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return f:read(c)
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end
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local function peek(f, c)
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c = c or 1
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local z = f:read(c)
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f:seek("cur", -c)
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return z
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end
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local function skip(f, c)
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c = c or 1
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return f:seek("cur", c)
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end
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local ws = {
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["\t"] = true,
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[" "] = true
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}
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local function parse_hex(f)
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local lc = " "
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local hex = ""
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while (48 <= lc:byte() and lc:byte() <= 57) or (97 <= lc:byte() and lc:byte() <= 102) or (65 <= lc:byte() and lc:byte() <= 70) and lc do
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lc = nextc(f)
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if (48 <= lc:byte() and lc:byte()) <= 57 or (97 <= lc:byte() and lc:byte() <= 102) or (65 <= lc:byte() and lc:byte() <= 70) and lc then
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hex = hex .. lc
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end
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end
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return tonumber(hex, 16)
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end
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local function parse_number(f, c)
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local lc = " "
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local num = c
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while 48 <= lc:byte() and lc:byte() <= 57 and lc do
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lc = nextc(f)
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if (48 <= lc:byte() and lc:byte() <= 57) and lc then
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num = num .. lc
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end
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end
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return tonumber(hex, 10)
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end
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local esct = {
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["t"] = "\t",
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["n"] = "\n",
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["r"] = "\r",
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["\\"] = "\\\\"
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}
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for i=0, 9 do
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esct[tostring(i)] = string.char(i)
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end
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local function parse_dblquote(f)
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local val = ""
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while peek(f) ~= "\"" do
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local c = nextc(f)
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if (peek(f) == "\n" or peek(f) == "\r") then
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return nil, "Unexpected end of line"
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elseif (not peek(f)) then
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return nil, "Unexpected end of file"
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end
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if (c == "\\") then
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if (esct[peek(f)]) then
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c = esct[peek(f)]
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skip(f)
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else
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c = nextc(f)
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end
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end
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val = val .. c
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end
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skip(f)
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return val
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end
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local function parse_snglquote(f)
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local val = ""
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while peek(f) ~= "\'" do
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local c = nextc(f)
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if (peek(f) == "\n" or peek(f) == "\r") then
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return nil, "Unexpected end of line"
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elseif (not peek(f)) then
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return nil, "Unexpected end of file"
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end
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if (c == "\\") then
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if (esct[peek(f)]) then
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c = esct[peek(f)]
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skip(f)
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else
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c = nextc(f)
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end
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end
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val = val .. c
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end
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skip(f)
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return val
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end
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local function parse_envarg(f)
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local val = ""
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while peek(f) ~= ")" do
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if (peek(f) == "\n" or peek(f) == "\r") then
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return nil, "Unexpected end of line"
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elseif (not peek(f)) then
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return nil, "Unexpected end of file"
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end
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val = val .. nextc(f)
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end
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skip(f)
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return val
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end
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local function parse_directive(f)
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local lc = "_"
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local name = ""
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local args = {}
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local carg = ""
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while not ws[lc] do
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lc = nextc(f)
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if (lc == "\n" or lc == "\r") then
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if (lc == "\r" and peek(f) == "\n") then skip(f) end
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return {type="directive", name=name}
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elseif not ws[lc] then
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name = name .. lc
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end
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end
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while true do
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lc = nextc(f)
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if (lc == "\n" or lc == "\r") then
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if (lc == "\r" and peek(f) == "\n") then skip(f) end
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return {type="directive", name=name, args=args}
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elseif lc == "0" and peek(f) == "x" then
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skip(f)
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local val = parse_hex(f)
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args[#args+1] = val
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elseif 48 <= lc:byte() and lc:byte() <= 57 then
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local val = parse_number(f, lc)
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args[#args+1] = val
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elseif lc == "\"" then
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local val, e = parse_dblquote(f)
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if not val then return val, e end
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args[#args+1] = val
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elseif lc == "\'" then
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local val, e = parse_snglquote(f)
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if not val then return val, e end
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args[#args+1] = val
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elseif lc == "$" and peek(f) == "(" then
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skip(f)
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local val = parse_envarg(f)
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if not os.getenv(val) then return nil, "Enviroment variable `"..val.."' does not exist." end
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args[#args+1] = os.getenv(val)
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elseif lc == "@" and peek(f, 2) == "[{" then
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skip(f, 2)
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local val = ""
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while peek(f, 2) ~= "}]" do
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val = val .. nextc(f)
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end
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args[#args+1] = {type="lua_var", val}
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skip(f, 2)
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elseif not ws[lc] then
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return nil, "Syntax error"
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end
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end
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end
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local function mkast(f, n)
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io.stderr:write("PROC\t",n,"\n")
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local lc = " "
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local lpos = 1
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local ilpos = 1
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local tree = {}
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local code = ""
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local branches = {}
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local function add_code()
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tree[#tree+1] = {type="code", data=code, file=n, line=lpos}
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code = ""
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end
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local function parse_error(e)
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io.stderr:write("ERROR:"..n..":"..lpos..": "..e.."\n")
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os.exit(1)
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end
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while lc and lc ~= "" do
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lc = nextc(f)
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if (lc == "-" and ilpos == 1) then
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if (peek(f, 2) == "-#") then --Directive
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add_code()
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skip(f, 2)
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local d, r = parse_directive(f)
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if not d then
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parse_error(r)
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end
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d.line = lpos
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d.file = n
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lpos = lpos+1
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tree[#tree+1] = d
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else
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code = code .. lc
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ilpos = ilpos+1
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end
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elseif (lc == "/" and ilpos == 1) then
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if (peek(f, 2) == "/#") then --Directive
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add_code()
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skip(f, 2)
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local d, r = parse_directive(f)
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if not d then
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parse_error(r)
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end
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d.line = lpos
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d.file = n
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lpos = lpos+1
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tree[#tree+1] = d
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else
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code = code .. lc
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ilpos = ilpos+1
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end
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elseif (lc == "$" and peek(f) == "(") then
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add_code()
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skip(f)
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local val, e = parse_envarg(f)
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if not val then
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parse_error(e)
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end
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tree[#tree+1] = {type="envvar", var=val, file=n, line=lpos}
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elseif (lc == "@" and peek(f, 2) == "[[") then
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add_code()
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skip(f, 2)
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local val = ""
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while peek(f, 2) ~= "]]" do
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val = val .. nextc(f)
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end
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tree[#tree+1] = {type="lua", code=val, file=n, line=lpos}
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skip(f, 2)
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elseif (lc == "@" and peek(f, 2) == "[{") then
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add_code()
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skip(f, 2)
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local val = ""
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while peek(f, 2) ~= "}]" do
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val = val .. nextc(f)
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end
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tree[#tree+1] = {type="lua_r", code=val, file=n, line=lpos}
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skip(f, 2)
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elseif (lc == "$" and peek(f, 2) == "[[") then
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add_code()
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skip(f, 2)
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local val = ""
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while peek(f, 2) ~= "]]" do
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val = val .. nextc(f)
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end
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tree[#tree+1] = {type="shell", code=val, file=n, line=lpos}
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skip(f, 2)
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elseif (lc == "$" and peek(f, 2) == "[{") then
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add_code()
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skip(f, 2)
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local val = ""
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while peek(f, 2) ~= "}]" do
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val = val .. nextc(f)
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end
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tree[#tree+1] = {type="shell_r", code=val, file=n, line=lpos}
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skip(f, 2)
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elseif (lc == "\r" or lc == "\n") then
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if (lc == "\r" and peek(f) == "\n") then
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skip(f)
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end
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lpos = lpos+1
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ilpos = 1
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code = code .. "\n"
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else
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code = code .. (lc or "")
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ilpos = ilpos+1
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end
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end
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add_code()
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return tree
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end |