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July 16, 2018 19:46
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Prefix all global identifiers in your Lua script with backslash
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| #!/usr/bin/env lua | |
| --------------------------------------------------------------------------------------------------------------------------------------- | |
| -- Converter from "source text" to "globals-backslashed source text" | |
| --------------------------------------------------------------------------------------------------------------------------------------- | |
| -- Reads Lua program from STDIN | |
| -- Writes converted program to STDOUT (if the program is syntactically correct) | |
| -- Writes parsing error to STDERR (if the program is not syntactically correct) | |
| -- Usage (both Windows and Linux): | |
| -- lua make_globals_backslashed.lua < your_program.lua > your_program_in_globals_backslashed_style.lua | |
| local parser | |
| do | |
| local | |
| byte, sub, find, char, rep, match, gsub, upper, reverse, pairs, ipairs, tonumber, tostring, type, unpack, table_concat, math_min, huge | |
| = | |
| string.byte, string.sub, string.find, string.char, string.rep, string.match, string.gsub, string.upper, string.reverse, | |
| pairs, ipairs, tonumber, tostring, type, table.unpack or unpack, table.concat, math.min, math.huge | |
| local scanner | |
| do | |
| local keyword_types = { | |
| ["nil"] = "literal value", | |
| ["false"] = "literal value", | |
| ["true"] = "literal value", | |
| ["not"] = "operator", | |
| ["and"] = "operator", | |
| ["or"] = "operator", | |
| ["repeat"] = "operator", | |
| ["until"] = "operator", | |
| ["while"] = "operator", | |
| ["do"] = "operator", | |
| ["end"] = "operator", | |
| ["if"] = "operator", | |
| ["then"] = "operator", | |
| ["elseif"] = "operator", | |
| ["else"] = "operator", | |
| ["for"] = "operator", | |
| ["in"] = "operator", | |
| ["local"] = "operator", | |
| ["break"] = "operator", | |
| ["return"] = "operator", | |
| ["function"] = "operator", | |
| } | |
| local keyword_values = { ["false"] = false, ["true"] = true } -- ["nil"] = nil | |
| local escapes = { a = "\a", b = "\b", f = "\f", n = "\n", r = "\r", t = "\t", v = "\v", ["\\"] = "\\", ['"'] = '"', ["'"] = "'", ["\n"] = "\n" } | |
| local type_of_characters = { -- some characters are omitted intentionally | |
| [" "] = "lexem delimiter", | |
| ["\n"] = "lexem delimiter", | |
| ["\t"] = "lexem delimiter", | |
| ["\f"] = "lexem delimiter", | |
| ["\v"] = "lexem delimiter", | |
| ["#"] = "operator", | |
| ["("] = "operator", [")"] = "operator", ["{"] = "operator", ["}"] = "operator", ["]"] = "operator", | |
| ["+"] = "operator", ["*"] = "operator", ["%"] = "operator", ["^"] = "operator", | |
| [","] = "operator", [";"] = "operator", | |
| ["&"] = "bitwise operator", | |
| ["|"] = "bitwise operator", | |
| ["'"] = "quote", ['"'] = "quote", | |
| ["<"] = "comparison", [">"] = "comparison", ["="] = "comparison", ["~"] = "comparison", | |
| _ = "alpha", | |
| } | |
| for j = 1, 26 do | |
| type_of_characters[char(64 + j)] = "alpha" -- A-Z | |
| type_of_characters[char(96 + j)] = "alpha" -- a-z | |
| end | |
| for j = 0, 9 do | |
| type_of_characters[char(48 + j)] = "digit" -- 0-9 | |
| end | |
| local all_scanners = {} | |
| local all_supported_versions = { ["51"] = true, ["52"] = true, ["53"] = true, ["54"] = true } | |
| function scanner(version) | |
| version = gsub(version, "%D", "") | |
| local scanner_for_version = all_scanners[version] | |
| if not scanner_for_version then | |
| if not all_supported_versions[version] then | |
| error("There is no scanner for this version available", 2) | |
| end | |
| local version_53_plus = version == "53" or version == "54" | |
| local version_52_plus = version_53_plus or version == "52" | |
| local feature_floating_point_hex_numbers = version_52_plus | |
| local feature_goto_is_keyword = version_52_plus | |
| local feature_prohibit_unknown_escapes = version_52_plus | |
| local feature_backslash_z = version_52_plus | |
| local feature_backslash_x = version_52_plus | |
| local feature_backslash_u = version_53_plus | |
| local feature_int64 = version_53_plus | |
| function scanner_for_version(lua_code) | |
| local pos = 1 -- position of first unread character | |
| local current_line_no = 1 | |
| local current_line_start_pos = 1 | |
| local function get_current_line_col() | |
| return | |
| current_line_no, | |
| pos - current_line_start_pos + 1, | |
| pos | |
| end | |
| local function read_character() | |
| -- returns next_character (any variant of newline is converted to "\n") | |
| -- returns nil (when EOF) | |
| local character = sub(lua_code, pos, pos) | |
| if pos == 1 and character == "#" then | |
| repeat -- skip shebang | |
| pos = pos + 1 | |
| character = sub(lua_code, pos, pos) | |
| until character == "\n" or character == "\r" or character == "" | |
| end | |
| if character ~= "" then | |
| pos = pos + 1 | |
| if character == "\n" or character == "\r" then | |
| local newline = character | |
| character = sub(lua_code, pos, pos) | |
| if (character == "\n" or character == "\r") and newline ~= character then | |
| pos = pos + 1 | |
| end | |
| current_line_no = current_line_no + 1 | |
| current_line_start_pos = pos | |
| character = "\n" | |
| end | |
| return character | |
| end | |
| end | |
| local function read_string_literal(line_no, col_no, quote, is_comment) | |
| -- current position is just after opening quote | |
| -- returns true | |
| -- returns nil, error_message (in case of error) | |
| if quote == '"' or quote == "'" then | |
| local unfinished | |
| while true do | |
| local character = read_character() | |
| if not character or character == "\n" then | |
| unfinished = true | |
| break | |
| end | |
| if character == quote then | |
| break | |
| end | |
| if character == "\\" then | |
| character = read_character() | |
| local line_no, col_no = get_current_line_col() | |
| col_no = col_no - 2 | |
| if not character then | |
| unfinished = true | |
| break | |
| end | |
| local code = byte(character) | |
| if code >= 48 and code <= 57 then | |
| character = code - 48 | |
| for _ = 1, 2 do | |
| code = byte(lua_code, pos) | |
| if not code or code < 48 or code > 57 then | |
| break | |
| end | |
| read_character() | |
| character = character * 10 + code - 48 | |
| end | |
| if character > 255 then | |
| return nil, "Syntax error: decimal escape too large at line "..line_no.." col "..col_no | |
| end | |
| else | |
| local unescaped = escapes[character] | |
| if character == "z" and feature_backslash_z then | |
| while find(lua_code, "^%s", pos) do | |
| read_character() | |
| end | |
| unescaped = true | |
| elseif character == "x" and feature_backslash_x then | |
| local character = match(lua_code, "^%x%x", pos) | |
| if not character then | |
| return nil, "Syntax error: two hexadecimal digits expected after '\\x' at line "..line_no.." col "..col_no | |
| end | |
| unescaped = true | |
| read_character() | |
| read_character() | |
| elseif character == "u" and feature_backslash_u then | |
| if read_character() ~= "{" then | |
| return nil, "Syntax error: '{' is expected after '\\u' at line "..line_no.." col "..col_no | |
| end | |
| local digit_code | |
| unescaped = 0 | |
| repeat | |
| character = read_character() | |
| if character ~= "}" then | |
| digit_code = character and byte(upper(character)) or 0 | |
| if digit_code < 48 or digit_code > 90 or digit_code > 57 and digit_code < 65 then | |
| return nil, "Syntax error: '{XXX}' is expected after '\\u' at line "..line_no.." col "..col_no | |
| end | |
| unescaped = unescaped * 16 + tonumber(character, 16) | |
| if unescaped > 0x10FFFF then | |
| return nil, "Syntax error: UTF-8 value too large at line "..line_no.." col "..col_no | |
| end | |
| end | |
| until character == "}" | |
| if not digit_code then | |
| return nil, "Syntax error: hexadecimal digit is expected after '\\u{' at line "..line_no.." col "..col_no | |
| end | |
| end | |
| if feature_prohibit_unknown_escapes and not unescaped then | |
| return nil, "Syntax error: invalid escape sequence at line "..line_no.." col "..col_no | |
| end | |
| end | |
| end | |
| end | |
| if unfinished then | |
| return nil, "Syntax error: unfinished string literal at line "..line_no.." col "..col_no | |
| end | |
| else | |
| quote = "]"..rep("=", #quote - 2).."]" | |
| local next_character = sub(lua_code, pos, pos) | |
| if next_character == "\n" or next_character == "\r" then | |
| read_character() | |
| end | |
| local quote_start_pos, quote_end_pos = find(lua_code, quote, pos, true) | |
| if not quote_start_pos then | |
| return nil, "Syntax error: unfinished long "..(is_comment and "comment" or "string literal").." at line "..line_no.." col "..col_no | |
| end | |
| while pos < quote_start_pos do | |
| read_character() | |
| end | |
| pos = quote_end_pos + 1 | |
| end | |
| return true | |
| end | |
| local function scan_next_lexem() | |
| -- returns {lexem.type == "EOF"} (in case of EOF) | |
| -- returns nil, error_message (in case of error) | |
| -- returns lexem record consisting of the following fields: | |
| -- type subtype additional fields | |
| -- ---------------------------- --------------------------------- ----------------- | |
| -- "identifier" line col pos | |
| -- "literal value" "boolean"/"nil"/"string"/"number" line col pos | |
| -- "comment" "short"/"long" line col pos | |
| -- (all operators and keywords) line col pos | |
| -- "EOF" line col pos | |
| local line_no, col_no, lexem_start_pos, character, character_type | |
| repeat | |
| line_no, col_no, lexem_start_pos = get_current_line_col() | |
| character = read_character() | |
| character_type = type_of_characters[character] | |
| until character_type ~= "lexem delimiter" | |
| if character then | |
| local next_character = sub(lua_code, pos, pos) | |
| local next_next_character = sub(lua_code, pos + 1, pos + 1) | |
| local code = byte(character) | |
| if character_type == "alpha" then -- A-Za-z_ | |
| character, pos = match(lua_code, "^([A-Za-z_%d]+)()", pos - 1) | |
| local keyword_type = keyword_types[character] | |
| if keyword_type == "literal value" then | |
| -- constants of types "boolean"/"nil" | |
| local value = keyword_values[character] | |
| return { type = keyword_type, subtype = type(value), line = line_no, col = col_no, pos = lexem_start_pos } | |
| elseif keyword_type or character == "goto" and feature_goto_is_keyword then | |
| -- keywords | |
| return { type = character, line = line_no, col = col_no, pos = lexem_start_pos } | |
| else | |
| -- identifiers | |
| return { type = "identifier", value = character, line = line_no, col = col_no, pos = lexem_start_pos } | |
| end | |
| elseif character_type == "operator" or character_type == "bitwise operator" and feature_int64 then | |
| -- punctuation | |
| return { type = character, line = line_no, col = col_no, pos = lexem_start_pos } | |
| elseif character_type == "quote" then | |
| local ok, error_message = read_string_literal(line_no, col_no, character) | |
| if ok then | |
| return { type = "literal value", subtype = "string", line = line_no, col = col_no, pos = lexem_start_pos } | |
| else | |
| return nil, error_message | |
| end | |
| elseif character_type == "comparison" then | |
| if next_character == "=" or character == next_character and character ~= "~" and feature_int64 then | |
| character = character..next_character | |
| pos = pos + 1 | |
| end | |
| if character == "~" and not feature_int64 then | |
| return nil, "Syntax error at line "..line_no.." col "..col_no | |
| end | |
| return { type = character, line = line_no, col = col_no, pos = lexem_start_pos } | |
| elseif character == "0" and (next_character == "x" or next_character == "X") then | |
| local hex_pos = pos + 1 | |
| if feature_floating_point_hex_numbers then | |
| character, pos = match(lua_code, "^([%.%x]*)()", hex_pos) | |
| local ok = find(character, "^%x*%.?%x*$") and character ~= "." and character ~= "" | |
| if upper(sub(lua_code, pos, pos)) == "P" then | |
| pos = match(lua_code, "^[%+%-]?%d+()", pos + 1) | |
| end | |
| if not (ok and pos) then | |
| return nil, "Syntax error: malformed hexadecimal number at line "..line_no.." col "..col_no | |
| end | |
| return { type = "literal value", subtype = "number", line = line_no, col = col_no, pos = lexem_start_pos } | |
| else | |
| pos = match(lua_code, "^%x+()", hex_pos) | |
| if not pos then | |
| return nil, "Syntax error: malformed hexadecimal number at line "..line_no.." col "..col_no | |
| end | |
| return { type = "literal value", subtype = "number", line = line_no, col = col_no, pos = lexem_start_pos } | |
| end | |
| elseif character == "." and next_character == "." then | |
| if next_next_character == "." then | |
| pos = pos + 2 | |
| return { type = "...", line = line_no, col = col_no, pos = lexem_start_pos } | |
| else | |
| pos = pos + 1 | |
| return { type = "..", line = line_no, col = col_no, pos = lexem_start_pos } | |
| end | |
| elseif character == "." or character_type == "digit" then | |
| local starting_pos = pos - 1 | |
| character, pos = match(lua_code, "^([%.%d]+)()", starting_pos) | |
| if character == "." then | |
| return { type = character, line = line_no, col = col_no, pos = lexem_start_pos } | |
| else | |
| local ok = match(character, "^%d*%.?%d*$") | |
| if upper(sub(lua_code, pos, pos)) == "E" then | |
| pos = match(lua_code, "^[%+%-]?%d+()", pos + 1) | |
| end | |
| if not (ok and pos) then | |
| return nil, "Syntax error: malformed number at line "..line_no.." col "..col_no | |
| end | |
| return { type = "literal value", subtype = "number", line = line_no, col = col_no, pos = lexem_start_pos } | |
| end | |
| elseif character == "[" then | |
| if next_character == "[" or next_character == "=" then | |
| local equal_ctr = -1 | |
| repeat | |
| equal_ctr = equal_ctr + 1 | |
| character = read_character() | |
| if character ~= "[" and character ~= "=" then | |
| return nil, "Syntax error at line "..line_no.." col "..col_no | |
| end | |
| until character == "[" | |
| local ok, error_message = read_string_literal(line_no, col_no, "["..rep("=", equal_ctr).."[") | |
| if ok then | |
| return { type = "literal value", subtype = "string", line = line_no, col = col_no, pos = lexem_start_pos } | |
| else | |
| return nil, error_message | |
| end | |
| else | |
| return { type = character, line = line_no, col = col_no, pos = lexem_start_pos } | |
| end | |
| elseif character == "-" then | |
| if next_character == "-" then | |
| pos = pos + 1 | |
| local equal_ctr | |
| if next_next_character == "[" then | |
| equal_ctr = -1 | |
| repeat | |
| equal_ctr = equal_ctr + 1 | |
| local next_pos = pos + 1 + equal_ctr | |
| character = sub(lua_code, next_pos, next_pos) | |
| if character ~= "[" and character ~= "=" then | |
| equal_ctr = nil | |
| end | |
| until not equal_ctr or character == "[" | |
| end | |
| if equal_ctr then | |
| pos = pos + 2 + equal_ctr | |
| local ok, error_message = read_string_literal(line_no, col_no, rep("=", equal_ctr + 2), true) | |
| if ok then | |
| return { type = "comment", subtype = "long", line = line_no, col = col_no, pos = lexem_start_pos } | |
| else | |
| return nil, error_message | |
| end | |
| else | |
| pos = pos + #match(lua_code, "[^\r\n]*", pos) | |
| return { type = "comment", subtype = "short", line = line_no, col = col_no, pos = lexem_start_pos } | |
| end | |
| end | |
| return { type = character, line = line_no, col = col_no, pos = lexem_start_pos } | |
| elseif character == "/" then | |
| if next_character == "/" and feature_int64 then | |
| pos = pos + 1 | |
| character = "//" | |
| end | |
| return { type = character, line = line_no, col = col_no, pos = lexem_start_pos } | |
| elseif character == ":" then | |
| if next_character == ":" and feature_goto_is_keyword then | |
| pos = pos + 1 | |
| character = "::" | |
| end | |
| return { type = character, line = line_no, col = col_no, pos = lexem_start_pos } | |
| else | |
| return nil, "Syntax error at line "..line_no.." col "..col_no | |
| end | |
| else | |
| return { type = "EOF", line = line_no, col = col_no, pos = lexem_start_pos } | |
| end | |
| end | |
| return scan_next_lexem | |
| end | |
| all_scanners[version] = scanner_for_version | |
| end | |
| return scanner_for_version | |
| end | |
| end | |
| local function find_def(vars, name) | |
| -- returns subtype("local"/"upvalue"/"global"), def(only for "local"/"upvalue") | |
| -- vars[1] = parent_vars/nil, vars[2] = is_function_body, vars[name] = def | |
| local subtype = "local" | |
| repeat | |
| local def = vars[name] | |
| if def then | |
| return subtype, def | |
| end | |
| if vars[2] then | |
| subtype = "upvalue" | |
| end | |
| vars = vars[1] | |
| until not vars | |
| return "global" | |
| end | |
| local binary_operator_predecessors = { | |
| -- binary operators are preceded in Lua grammar only by the following lexems (ignoring comments): | |
| ["identifier"] = true, | |
| ["literal value"] = true, | |
| ["..."] = true, | |
| ["end"] = true, | |
| [")"] = true, | |
| ["}"] = true, | |
| ["]"] = true, | |
| } | |
| -- Priorities are positive numbers | |
| -- The same priority level must not be shared between unary and binary operators | |
| -- The same priority level must not be shared between left-associative and right-associative binary operators | |
| local binary_operators = { | |
| -- priorities of binary operators | |
| ["or"] = 1, | |
| ["and"] = 2, | |
| ["<"] = 3, [">"] = 3, ["<="] = 3, [">="] = 3, ["~="] = 3, ["=="] = 3, | |
| ["|"] = 4, | |
| ["~"] = 5, | |
| ["&"] = 6, | |
| ["<<"] = 7, [">>"] = 7, | |
| [".."] = 8, | |
| ["+"] = 9, ["-"] = 9, | |
| ["*"] = 10, ["/"] = 10, ["//"] = 10, ["%"] = 10, | |
| ["^"] = 12 | |
| } | |
| local unary_operators = { | |
| -- priorities of unary operators | |
| ["not"] = 11, ["#"] = 11, ["unary -"] = 11, ["unary ~"] = 11 | |
| } | |
| local right_associative_priorities = { | |
| -- precedences of right associative binary operators: | |
| [8] = true, -- .. concatenation | |
| [12] = true, -- ^ exponentiation | |
| } | |
| local all_parsers = {} | |
| local all_supported_versions = { ["51"] = true, ["52"] = true, ["53"] = true, ["54"] = true } | |
| function parser(version) | |
| version = gsub(version, "%D", "") | |
| local parser_for_version = all_parsers[version] | |
| if not parser_for_version then | |
| if not all_supported_versions[version] then | |
| error("There is no parser for this version available", 2) | |
| end | |
| local version_52_plus = version == "52" or version == "53" or version == "54" | |
| local feature_break_is_last_statement = version == "51" | |
| local feature_empty_statement = version_52_plus | |
| local feature_ENV = version_52_plus | |
| local lua_scanner = scanner(version) | |
| function parser_for_version(lua_code, global_catcher) | |
| -- returns true | |
| -- returns nil, error_message (in case of parsing error) | |
| local get_next_lexem_from_scanner = lua_scanner(lua_code) | |
| local error_message | |
| local next_lexem, next_next_lexem | |
| local last_lexem, before_last_lexem | |
| local prev_non_comment_lexem_type | |
| local function read_lexem() | |
| -- returns nil in case of error (error_message is set) | |
| -- lexem.type == "EOF" (when EOF) | |
| local lexem | |
| if next_lexem then | |
| lexem, next_lexem, next_next_lexem = next_lexem, next_next_lexem | |
| else | |
| repeat | |
| lexem, error_message = get_next_lexem_from_scanner() | |
| if not lexem then | |
| return | |
| end | |
| local lexem_type = lexem.type | |
| local is_comment = lexem_type == "comment" | |
| if not is_comment then | |
| if (lexem_type == "-" or lexem_type == "~") and not binary_operator_predecessors[prev_non_comment_lexem_type] then | |
| lexem_type = "unary "..lexem_type | |
| lexem.type = lexem_type | |
| end | |
| prev_non_comment_lexem_type = lexem_type | |
| end | |
| until not is_comment | |
| end | |
| before_last_lexem, last_lexem = last_lexem, lexem | |
| return lexem | |
| end | |
| local function unread_last_lexem() | |
| last_lexem, next_lexem, next_next_lexem = before_last_lexem, last_lexem, next_lexem | |
| end | |
| local function get_lexem_coordinates_as_text(lexem) | |
| if lexem.type == "EOF" then | |
| return "EOF" | |
| else | |
| return "line "..lexem.line.." col "..lexem.col | |
| end | |
| end | |
| local read_chunk, read_exp, read_explist | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| local function read_table_constructor(vars) | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| -- opening curly brace is already read | |
| unread_last_lexem() | |
| local result = read_lexem() -- this is the opening curly brace | |
| result.type = "table constructor" | |
| local array_of_table_items = {} | |
| result.items = array_of_table_items | |
| local lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| local lexem_type = lexem.type | |
| while lexem_type ~= "}" do | |
| local index_exp, field_exp, value_exp | |
| if lexem_type == "[" then | |
| index_exp = read_exp(vars) | |
| if not index_exp then | |
| return | |
| end | |
| lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| if lexem.type ~= "]" then | |
| error_message = "Syntax error: ']' is expected at "..get_lexem_coordinates_as_text(lexem) | |
| return | |
| end | |
| lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| if lexem.type ~= "=" then | |
| error_message = "Syntax error: '=' is expected at "..get_lexem_coordinates_as_text(lexem) | |
| return | |
| end | |
| value_exp = read_exp(vars) | |
| if not value_exp then | |
| return | |
| end | |
| else | |
| if lexem_type == "identifier" then | |
| local next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type == "=" then | |
| field_exp = lexem | |
| field_exp.subtype = "field" | |
| else | |
| unread_last_lexem() | |
| end | |
| end | |
| if not field_exp then | |
| unread_last_lexem() | |
| end | |
| value_exp = read_exp(vars) | |
| if not value_exp then | |
| return | |
| end | |
| end | |
| array_of_table_items[#array_of_table_items + 1] = { index = index_exp, field = field_exp, value = value_exp } | |
| lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| lexem_type = lexem.type | |
| if lexem_type == "," or lexem_type == ";" then | |
| lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| lexem_type = lexem.type | |
| elseif lexem_type ~= "}" then | |
| error_message = "Syntax error: ',' or ';' or '}' is expected at "..get_lexem_coordinates_as_text(lexem) | |
| return | |
| end | |
| end | |
| return result | |
| end | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| local function read_funcbody(vars, invisible_self_argument) | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| local result = read_lexem() | |
| if not result then | |
| return | |
| end | |
| if result.type ~= "(" then | |
| error_message = "Syntax error: '(' is expected at "..get_lexem_coordinates_as_text(result) | |
| return | |
| end | |
| result.type = "function definition" | |
| local arguments = {} | |
| if invisible_self_argument then | |
| arguments[1] = { type = "identifier", subtype = "definition", value = "self", line = result.line, col = result.col, pos = result.pos } | |
| end | |
| result.arguments = arguments | |
| local is_vararg = false | |
| local after_separator = true | |
| local visible_argument | |
| while true do | |
| local lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| local lexem_type = lexem.type | |
| if lexem_type == ")" and not (after_separator and visible_argument) then | |
| local body = read_chunk(vars, false, arguments, true) | |
| if not body then | |
| return | |
| end | |
| result.body = body | |
| local closing_lexem = read_lexem() | |
| if not closing_lexem then | |
| return | |
| end | |
| if closing_lexem.type ~= "end" then | |
| error_message = "Syntax error: 'end' is expected at "..get_lexem_coordinates_as_text(closing_lexem) | |
| return | |
| end | |
| result.is_vararg = is_vararg | |
| return result | |
| elseif lexem_type == "," and not after_separator and not is_vararg then | |
| after_separator = true | |
| elseif (lexem_type == "identifier" or lexem_type == "...") and after_separator then | |
| arguments[#arguments + 1] = lexem | |
| visible_argument = true | |
| after_separator = false | |
| is_vararg = lexem_type == "..." | |
| else | |
| error_message = "Syntax error in function argument list at "..get_lexem_coordinates_as_text(lexem) | |
| return | |
| end | |
| end | |
| end | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| local function read_prefixexp(vars) | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| -- returns prefixexp_subtree, exp_type, first_lexem_of_prefixexp | |
| -- exp_type: 1 = rvalue (neither lvalue nor funccall) | |
| -- 3 = funccall | |
| -- 5 = lvalue | |
| local exp_type | |
| local first_lexem = read_lexem() | |
| if not first_lexem then | |
| return | |
| end | |
| local lexem_type = first_lexem.type | |
| if lexem_type == "(" then | |
| exp_type = 1 | |
| first_lexem.type = "(expression)" | |
| local expression = read_exp(vars) | |
| if not expression then | |
| return | |
| end | |
| first_lexem.expression = expression | |
| local lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| if lexem.type ~= ")" then | |
| error_message = "Syntax error: ')' is expected at "..get_lexem_coordinates_as_text(lexem) | |
| return | |
| end | |
| elseif lexem_type == "identifier" then | |
| exp_type = 5 | |
| first_lexem.subtype, first_lexem.def = find_def(vars, first_lexem.value) | |
| if global_catcher and first_lexem.subtype == "global" then | |
| global_catcher(first_lexem) | |
| end | |
| else | |
| error_message = "Syntax error at "..get_lexem_coordinates_as_text(first_lexem) | |
| return | |
| end | |
| local result = first_lexem | |
| while true do | |
| local lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| lexem_type = lexem.type | |
| if lexem_type == "[" then | |
| -- [index] | |
| exp_type = 5 | |
| lexem.type = "table[index]" | |
| lexem.table = result | |
| local exp = read_exp(vars) | |
| if not exp then | |
| return | |
| end | |
| lexem.index = exp | |
| local next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type ~= "]" then | |
| error_message = "Syntax error: ']' is expected at "..get_lexem_coordinates_as_text(next_lexem) | |
| end | |
| result = lexem | |
| elseif lexem_type == "." then | |
| -- .field | |
| exp_type = 5 | |
| lexem.type = "object.field" | |
| lexem.object = result | |
| local next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type ~= "identifier" then | |
| error_message = "Syntax error: an identifier is expected at"..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| next_lexem.subtype = "field" | |
| lexem.field = next_lexem | |
| result = lexem | |
| elseif lexem_type == ":" or lexem_type == "(" or lexem_type == "{" or lexem_type == "literal value" and lexem.subtype == "string" then | |
| -- function call | |
| exp_type = 3 | |
| if lexem_type == ":" then | |
| lexem.object = result | |
| result = lexem | |
| lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| if lexem.type ~= "identifier" then | |
| error_message = "Syntax error: an identifier is expected after ':' at "..get_lexem_coordinates_as_text(lexem) | |
| return | |
| end | |
| lexem.subtype = "field" | |
| result.method = lexem | |
| lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| lexem_type = lexem.type | |
| if not (lexem_type == "(" or lexem_type == "{" or lexem_type == "literal value" and lexem.subtype == "string") then | |
| error_message = "Syntax error: '(' is expected at "..get_lexem_coordinates_as_text(lexem) | |
| return | |
| end | |
| else | |
| if lexem_type == "(" then | |
| lexem.object = result | |
| result = lexem | |
| else | |
| result = { object = result, line = lexem.line, col = lexem.col } | |
| end | |
| end | |
| result.type = "funccall" | |
| if lexem_type == "(" then | |
| lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| if lexem.type == ")" then | |
| result.arguments = {} | |
| else | |
| unread_last_lexem() | |
| local arguments = read_explist(vars) | |
| if not arguments then | |
| return | |
| end | |
| result.arguments = arguments | |
| lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| if lexem.type ~= ")" then | |
| error_message = "Syntax error: ')' is expected at "..get_lexem_coordinates_as_text(lexem) | |
| return | |
| end | |
| end | |
| elseif lexem_type == "{" then | |
| -- read table constructor | |
| local table_constructor_exp = read_table_constructor(vars) | |
| if not table_constructor_exp then | |
| return | |
| end | |
| result.arguments = { table_constructor_exp } | |
| else -- literal string as single argument | |
| result.arguments = { lexem } | |
| end | |
| else | |
| unread_last_lexem() | |
| return result, exp_type, first_lexem | |
| end | |
| end | |
| end | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| local function read_term(vars) | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| -- term is an expression having root operator (last operator to be executed) different from "exp ::= exp binop exp" | |
| local lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| local lexem_type = lexem.type | |
| if lexem_type == "literal value" then | |
| return lexem | |
| elseif lexem_type == "..." then | |
| lexem.subtype, lexem.def = find_def(vars, lexem_type) | |
| return lexem | |
| elseif lexem_type == "{" then | |
| return read_table_constructor(vars) | |
| elseif lexem_type == "function" then | |
| return read_funcbody(vars) | |
| else | |
| local unary_oper_priority = unary_operators[lexem_type] | |
| if unary_oper_priority then | |
| local argument, ends_with_prefixexp = read_exp(vars, unary_oper_priority) | |
| if not argument then | |
| return | |
| end | |
| lexem.argument = argument | |
| return lexem, ends_with_prefixexp | |
| else | |
| unread_last_lexem() | |
| return read_prefixexp(vars) -- second returned value is always truthy | |
| end | |
| end | |
| end | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| local function read_chain_of_binary_operators_with_specified_priority(vars, first_term, first_binary_operator, chain_priority) | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| -- parse expression consisting of binary operators with specified priority | |
| first_binary_operator.left_argument = first_term | |
| local is_right_associative = right_associative_priorities[chain_priority] | |
| local term, ends_with_prefixexp = read_term(vars) | |
| if not term then | |
| return | |
| end | |
| first_binary_operator.right_argument = term | |
| local last_binary_operator = first_binary_operator | |
| while true do | |
| local binary_operator = read_lexem() | |
| if not binary_operator then | |
| return | |
| end | |
| local priority = binary_operators[binary_operator.type] | |
| if not priority or priority < chain_priority then | |
| unread_last_lexem() | |
| return is_right_associative and first_binary_operator or last_binary_operator, ends_with_prefixexp | |
| elseif priority > chain_priority then | |
| term, ends_with_prefixexp = read_chain_of_binary_operators_with_specified_priority(vars, last_binary_operator.right_argument, binary_operator, priority) | |
| if not term then | |
| return | |
| end | |
| last_binary_operator.right_argument = term | |
| else | |
| term, ends_with_prefixexp = read_term(vars) | |
| if not term then | |
| return | |
| end | |
| binary_operator.right_argument = term | |
| if is_right_associative then | |
| binary_operator.left_argument = last_binary_operator.right_argument | |
| last_binary_operator.right_argument = binary_operator | |
| else | |
| binary_operator.left_argument = last_binary_operator | |
| end | |
| last_binary_operator = binary_operator | |
| end | |
| end | |
| end | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| function read_exp(vars, outer_priority) | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| local fake_operator, ends_with_prefixexp = read_chain_of_binary_operators_with_specified_priority(vars, nil, {}, outer_priority or 0) | |
| if not fake_operator then | |
| return | |
| end | |
| return fake_operator.right_argument, ends_with_prefixexp | |
| end | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| function read_explist(vars, min_qty, max_qty) | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| min_qty, max_qty = min_qty or 1, max_qty or huge | |
| local rvalues = { } | |
| local exp, ends_with_prefixexp | |
| repeat | |
| exp, ends_with_prefixexp = read_exp(vars) | |
| if not exp then | |
| return | |
| end | |
| rvalues[#rvalues + 1] = exp | |
| local qty = #rvalues | |
| local lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| local is_comma = qty < max_qty and lexem.type == "," | |
| if qty < min_qty and not is_comma then | |
| error_message = "Syntax error: ',' is expected at "..get_lexem_coordinates_as_text(lexem) | |
| return | |
| end | |
| until not is_comma | |
| unread_last_lexem() | |
| return rvalues, ends_with_prefixexp | |
| end | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| local function read_namelist(vars, name_separator) | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| name_separator = name_separator or "," | |
| local identifiers = {} | |
| repeat | |
| local lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| if lexem.type ~= "identifier" then | |
| error_message = "Syntax error: an identifier is expected at "..get_lexem_coordinates_as_text(lexem) | |
| return | |
| end | |
| if name_separator == "," then | |
| if vars then | |
| vars[lexem.value] = lexem | |
| end | |
| lexem.subtype = "definition" | |
| elseif identifiers[1] then | |
| lexem.subtype = "field" | |
| else | |
| lexem.subtype, lexem.def = find_def(vars, lexem.value) | |
| if global_catcher and lexem.subtype == "global" then | |
| global_catcher(lexem) | |
| end | |
| end | |
| identifiers[#identifiers + 1] = lexem | |
| lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| until lexem.type ~= name_separator | |
| unread_last_lexem() | |
| return identifiers | |
| end | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| local function read_statement(vars, inside_loop) | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| local lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| local lexem_type = lexem.type | |
| if lexem_type == "break" then | |
| if not inside_loop then | |
| error_message = "Syntax error: 'break' must be inside loop at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| return lexem, feature_break_is_last_statement and "Syntax error: statement after 'break' at " | |
| elseif lexem_type == "do" then | |
| local chunk = read_chunk(vars, inside_loop) | |
| if not chunk then | |
| return | |
| end | |
| lexem.body = chunk | |
| local next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type ~= "end" then | |
| error_message = "Syntax error: 'end' is expected at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| return lexem | |
| elseif lexem_type == "for" then | |
| local names = read_namelist() | |
| if not names then | |
| return | |
| end | |
| local next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| lexem_type = next_lexem.type | |
| if lexem_type == "in" or lexem_type == "=" and not names[2] then | |
| -- for namelist in explist do chunk end | |
| -- for Name `=` exp `,` exp [`,` exp] do chunk end | |
| lexem.variables = names | |
| local numeric_for = lexem_type == "=" | |
| lexem.subtype = numeric_for and "numeric" or "generic" | |
| local expressions = read_explist(vars, numeric_for and 2, 3) | |
| if not expressions then | |
| return | |
| end | |
| lexem.expressions = expressions | |
| next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type ~= "do" then | |
| error_message = "Syntax error: 'do' is expected at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| local body = read_chunk(vars, true, names) | |
| if not body then | |
| return | |
| end | |
| lexem.body = body | |
| next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type ~= "end" then | |
| error_message = "Syntax error: 'end' is expected at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| return lexem | |
| end | |
| error_message = "Syntax error in 'for' loop at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| elseif lexem_type == "if" then | |
| -- if exp then chunk {elseif exp then chunk} [else chunk] end | |
| local conditions = {} | |
| lexem.conditions = conditions | |
| local chunks = {} -- chunks array is one element longer than conditions array when "else" clause is present | |
| lexem.chunks = chunks | |
| while true do | |
| local exp = read_exp(vars) | |
| if not exp then | |
| return | |
| end | |
| conditions[#conditions + 1] = exp | |
| local next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type ~= "then" then | |
| error_message = "Syntax error: 'then' is expected at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| local chunk = read_chunk(vars, inside_loop) | |
| if not chunk then | |
| return | |
| end | |
| chunks[#conditions] = chunk | |
| next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| local lexem_type = next_lexem.type | |
| if lexem_type == "end" or lexem_type == "else" then | |
| if lexem_type == "else" then | |
| chunk = read_chunk(vars, inside_loop) | |
| if not chunk then | |
| return | |
| end | |
| chunks[#chunks + 1] = chunk | |
| next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type ~= "end" then | |
| error_message = "Syntax error: 'end' is expected at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| end | |
| return lexem | |
| elseif lexem_type ~= "elseif" then | |
| error_message = "Syntax error: 'end' or 'else' or 'elseif' is expected at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| end | |
| elseif lexem_type == "local" then | |
| local next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type == "function" then | |
| -- local function Name funcbody | |
| lexem.type = "local function" | |
| next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type ~= "identifier" then | |
| error_message = "Syntax error: an identifier is expected at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| next_lexem.subtype = "definition" | |
| vars[next_lexem.value] = next_lexem | |
| lexem.variable = next_lexem | |
| local func_def = read_funcbody(vars) | |
| if not func_def then | |
| return | |
| end | |
| lexem.func_def = func_def | |
| return lexem | |
| else | |
| unread_last_lexem() | |
| -- local namelist [`=` explist] | |
| local new_vars = {} | |
| local names = read_namelist(new_vars) | |
| if not names then | |
| return | |
| end | |
| lexem.variables = names | |
| next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| local expressions, ends_with_prefixexp | |
| if next_lexem.type == "=" then | |
| expressions, ends_with_prefixexp = read_explist(vars) | |
| if not expressions then | |
| return | |
| end | |
| else | |
| unread_last_lexem() | |
| end | |
| for k, v in pairs(new_vars) do | |
| vars[k] = v | |
| end | |
| lexem.expressions = expressions -- lexem.expressions may be nil for local variables without initialization | |
| lexem.ends_with_prefixexp = ends_with_prefixexp | |
| return lexem | |
| end | |
| elseif lexem_type == "repeat" then | |
| -- repeat chunk until exp | |
| local body, chunk_vars = read_chunk(vars, true) | |
| if not body then | |
| return | |
| end | |
| lexem.body = body | |
| local next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type ~= "until" then | |
| error_message = "Syntax error: 'until' is expected at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| local expression, ends_with_prefixexp = read_exp(chunk_vars) | |
| if not expression then | |
| return | |
| end | |
| lexem.expression = expression | |
| lexem.ends_with_prefixexp = ends_with_prefixexp | |
| return lexem | |
| elseif lexem_type == "return" then | |
| local next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| lexem_type = next_lexem.type | |
| unread_last_lexem() | |
| if lexem_type == "EOF" or lexem_type == "end" or lexem_type == "until" or lexem_type == "elseif" or lexem_type == "else" then | |
| lexem.expressions = {} | |
| else | |
| local expressions = read_explist(vars) | |
| if not expressions then | |
| return | |
| end | |
| lexem.expressions = expressions | |
| end | |
| return lexem, "Syntax error: statement after 'return' at " | |
| elseif lexem_type == "while" then | |
| -- while exp do chunk end | |
| local expression = read_exp(vars) | |
| if not expression then | |
| return | |
| end | |
| lexem.expression = expression | |
| local next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type ~= "do" then | |
| error_message = "Syntax error: 'do' is expected at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| local body = read_chunk(vars, true) | |
| if not body then | |
| return | |
| end | |
| lexem.body = body | |
| next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type ~= "end" then | |
| error_message = "Syntax error: 'end' is expected at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| return lexem | |
| elseif lexem_type == "function" then | |
| -- function Name {`.` Name} [`:` Name] funcbody | |
| local invisible_self_argument | |
| local names = read_namelist(vars, ".") | |
| if not names then | |
| return | |
| end | |
| lexem.name_chain = names | |
| local next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type == ":" then | |
| local method = read_lexem() | |
| if not method then | |
| return | |
| end | |
| if method.type ~= "identifier" then | |
| error_message = "Syntax error: an identifier is expected at "..get_lexem_coordinates_as_text(method) | |
| return | |
| end | |
| method.subtype = "field" | |
| lexem.method = method | |
| invisible_self_argument = true | |
| else | |
| unread_last_lexem() | |
| end | |
| local func_def = read_funcbody(vars, invisible_self_argument) | |
| if not func_def then | |
| return | |
| end | |
| lexem.func_def = func_def | |
| return lexem | |
| elseif lexem_type == "::" then | |
| local next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type ~= "identifier" then | |
| error_message = "Syntax error: label name is expected after '::' at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| lexem.label_identifier = next_lexem | |
| next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type ~= "::" then | |
| error_message = "Syntax error: '::' is expected after label name at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| return lexem | |
| elseif lexem_type == "goto" then | |
| local next_lexem = read_lexem() | |
| if not next_lexem then | |
| return | |
| end | |
| if next_lexem.type ~= "identifier" then | |
| error_message = "Syntax error: label name is expected after 'goto' at "..get_lexem_coordinates_as_text(next_lexem) | |
| return | |
| end | |
| lexem.label_identifier = next_lexem | |
| return lexem | |
| elseif lexem_type == ";" and feature_empty_statement then | |
| return lexem | |
| else | |
| local starts_with_parenthesis = lexem_type == "(" | |
| unread_last_lexem() | |
| local prefixexp, exp_type, first_lexem = read_prefixexp(vars) -- either lvalue or funccall | |
| if not prefixexp then | |
| return | |
| end | |
| if exp_type > 4 then | |
| -- lvalue found | |
| local lvalues = { prefixexp } | |
| while true do | |
| lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| lexem_type = lexem.type | |
| if lexem_type == "=" then | |
| local rvalues, ends_with_prefixexp = read_explist(vars) | |
| if not rvalues then | |
| return | |
| end | |
| lexem.lvalues = lvalues | |
| lexem.rvalues = rvalues | |
| lexem.starts_with_parenthesis = starts_with_parenthesis | |
| lexem.ends_with_prefixexp = ends_with_prefixexp | |
| return lexem | |
| elseif lexem_type == "," then | |
| prefixexp, exp_type, first_lexem = read_prefixexp(vars) | |
| if not prefixexp then | |
| return | |
| end | |
| if exp_type < 4 then | |
| error_message = "Syntax error: L-value is expected at "..get_lexem_coordinates_as_text(first_lexem) | |
| return | |
| end | |
| lvalues[#lvalues + 1] = prefixexp | |
| else | |
| error_message = "Syntax error: '=' or ',' is expected at "..get_lexem_coordinates_as_text(lexem) | |
| return | |
| end | |
| end | |
| elseif exp_type > 2 then | |
| -- funccall found | |
| prefixexp.starts_with_parenthesis = starts_with_parenthesis | |
| prefixexp.ends_with_prefixexp = true | |
| return prefixexp | |
| end | |
| error_message = "Syntax error: L-value or function call is expected at "..get_lexem_coordinates_as_text(first_lexem) | |
| return | |
| end | |
| end | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| function read_chunk(vars, inside_loop, additional_variables, is_function) | |
| -------------------------------------------------------------------------------------------------------------------------------------------- | |
| vars = { vars, is_function } | |
| if additional_variables then | |
| for _, def in ipairs(additional_variables) do | |
| vars[def.value or "..."] = def | |
| end | |
| end | |
| local statements = {} | |
| local after_last_statement | |
| while true do | |
| local lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| unread_last_lexem() | |
| local lexem_type = lexem.type | |
| if lexem_type == "EOF" or lexem_type == "end" or lexem_type == "until" or lexem_type == "elseif" or lexem_type == "else" then | |
| return statements, vars | |
| end | |
| if after_last_statement then | |
| error_message = after_last_statement..get_lexem_coordinates_as_text(lexem) | |
| return | |
| end | |
| lexem, after_last_statement = read_statement(vars, inside_loop) | |
| if not lexem then | |
| return | |
| end | |
| if lexem.type ~= ";" then | |
| statements[#statements + 1] = lexem | |
| end | |
| lexem = read_lexem() | |
| if not lexem then | |
| return | |
| end | |
| if lexem.type ~= ";" then | |
| unread_last_lexem() | |
| end | |
| end | |
| end | |
| local vars = | |
| feature_ENV | |
| and { _ENV = { type = "identifier", subtype = "definition", value = "_ENV", line = 1, col = 1, pos = 1 } } | |
| or nil | |
| local array_of_statements = read_chunk(vars, false, {{ type = "...", subtype = "definition", line = 1, col = 1, pos = 1 }}, true) | |
| if not array_of_statements then | |
| return nil, error_message | |
| end | |
| local lexem = read_lexem() | |
| if not lexem then | |
| return nil, error_message | |
| end | |
| if lexem.type ~= "EOF" then | |
| return nil, "EOF is expected at "..get_lexem_coordinates_as_text(lexem) | |
| end | |
| return true | |
| end | |
| all_parsers[version] = parser_for_version | |
| end | |
| return parser_for_version | |
| end | |
| end | |
| local program = io.read"*a" | |
| local global_positions = {} | |
| local function global_catcher(lexem) | |
| global_positions[lexem.pos] = "\\" -- "$" | |
| end | |
| assert(parser("Lua 5.3")(program, global_catcher)) | |
| program = program:gsub("()", global_positions) | |
| print(program) |
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