/
c_tokenise.lua
160 lines (132 loc) · 5.82 KB
/
c_tokenise.lua
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--[[ Copyright (c) 2009 Peter "Corsix" Cawley
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE. --]]
local lpeg = require("lpeg")
local C, P, R, S, V = lpeg.C, lpeg.P, lpeg.R, lpeg.S, lpeg.V
local Carg, Cc, Cp, Ct = lpeg.Carg, lpeg.Cc, lpeg.Cp, lpeg.Ct
local tokens = P { "tokens";
-- Comment of form /* ... */
comment = Ct(P"/*" * C((V"newline" + (1 - P"*/"))^0) * P"*/" * Cc"comment"),
-- Single line comment
line_comment = Ct(P"//" * C((1 - V"newline")^0) * Cc"comment_line"),
-- Single platform independent line break which increments line number
newline = (P"\r\n" + P"\n\r" + S"\r\n") * (Cp() * Carg(1)) / function(pos, state)
state.line = state.line + 1
state.line_start = pos
end,
-- Line continuation
line_extend = Ct(C(P[[\]] * V"newline") * Cc"line_extend"),
-- Whitespace of any length (includes newlines)
whitespace = Ct(C((S" \t" + V"newline")^1) * Cc"whitespace"),
-- Special form of #include with filename followed in angled brackets (matches 3 tokens)
include = Ct(C(P"#include") * Cc"preprocessor") *
Ct(C(S" \t"^1) * Cc"whitespace") *
Ct(C(P"<" * (1 - P">")^1 * P">") * Cc"string"),
-- Preprocessor instruction
preprocessor = V"include" +
Ct(C(P"#" * P" "^0 * ( P"define" + P"elif" + P"else" + P"endif" + P"#" +
P"error" + P"ifdef" + P"ifndef" + P"if" + P"import" +
P"include" + P"line" + P"pragma" + P"undef" + P"using"
) * #S" \r\n\t") * Cc"preprocessor"),
-- Identifier of form [a-zA-Z_][a-zA-Z0-9_]*
identifier = Ct(C(R("az","AZ","__") * R("09","az","AZ","__")^0) * Cc"identifier"),
-- Single character in a string
string_char = R("az","AZ","09") + S"$%^&*()_-+={[}]:;@~#<,>.!?/ \t" + (P"\\" * S[[ntvbrfa\?'"0x]]),
-- String literal
string = Ct(C(P"'" * (V"string_char" + P'"')^0 * P"'" +
P'"' * (V"string_char" + P"'")^0 * P'"') * Cc"string"),
-- Operator
operator = Ct(C(P">>=" + P"<<=" + P"..." +
P"::" + P"<<" + P">>" + P"<=" + P">=" + P"==" + P"!=" +
P"||" + P"&&" + P"++" + P"--" + P"->" + P"+=" + P"-=" +
P"*=" + P"/=" + P"|=" + P"&=" + P"^=" + S"+-*/=<>%^|&.?:!~,") * Cc"operator"),
-- Misc. char (token type is the character itself)
char = Ct(C(S"[]{}();") / function(x) return x, x end),
-- Hex, octal or decimal number
int = Ct(C((P"0x" * R("09","af","AF")^1) + (P"0" * R"07"^0) + R"09"^1) * Cc"integer"),
-- Floating point number
f_exponent = S"eE" + S"+-"^-1 * R"09"^1,
f_terminator = S"fFlL",
float = Ct(C(
R"09"^1 * V"f_exponent" * V"f_terminator"^-1 +
R"09"^0 * P"." * R"09"^1 * V"f_exponent"^-1 * V"f_terminator"^-1 +
R"09"^1 * P"." * R"09"^0 * V"f_exponent"^-1 * V"f_terminator"^-1
) * Cc"float"),
-- Any token
token = V"comment" +
V"line_comment" +
V"identifier" +
V"whitespace" +
V"line_extend" +
V"preprocessor" +
V"string" +
V"char" +
V"operator" +
V"float" +
V"int",
-- Error for when nothing else matches
error = (Cp() * C(P(1) ^ -8) * Carg(1)) / function(pos, where, state)
error(("Tokenising error on line %i, position %i, near '%s'")
:format(state.line, pos - state.line_start + 1, where))
end,
-- Match end of input or throw error
finish = -P(1) + V"error",
-- Match stream of tokens into a table
tokens = Ct(V"token" ^ 0) * V"finish",
}
function TokeniseC(str)
return tokens:match(str, 1, {line = 1, line_start = 1})
end
local escape_replacements = {
["<"] = "<",
[">"] = ">",
["&"] = "&",
}
local function escape(str)
return str:gsub("[<>&]", escape_replacements)
end
local C_keywords = set {
"break", "case", "char", "const", "continue", "default", "do", "double",
"else", "enum", "extern", "float", "for", "goto", "if", "int", "long",
"register", "return", "short", "signed", "sizeof", "static", "struct",
"switch", "typedef", "union", "unsigned", "void", "volatile", "while",
}
local C_to_HTML_handlers = {
comment = function(tok) return '<span class="c">' .. escape(tok[1]) .. '</span>' end,
identifier = function(tok)
if C_keywords[tok[1]] then
return '<span class="k k_' .. tok[1] .. '">' .. tok[1] .. '</span>'
else
return '<span class="i">' .. escape(tok[1]) .. '</span>'
end
end,
preprocessor = function(tok) return '<span class="p">' .. escape(tok[1]) .. '</span>' end,
string = function(tok) return '<span class="s">' .. escape(tok[1]) .. '</span>' end,
}
function C_to_HTML(str)
local tokens = TokeniseC(str)
local result = {}
for i, token in ipairs(tokens) do
local handler = C_to_HTML_handlers[token[2]]
if handler then
token = handler(token)
else
token = escape(token[1])
end
result[#result + 1] = token
end
return table.concat(result)
end