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effect_lexer.cpp
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/*
* Copyright (C) 2014 Patrick Mours
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "effect_lexer.hpp"
#include <cassert>
#include <string_view>
#include <unordered_map> // Used for static lookup tables
using namespace reshadefx;
enum token_type
{
DIGIT = '0',
IDENT = 'A',
SPACE = ' ',
};
// Lookup table which translates a given char to a token type
static const unsigned type_lookup[256] = {
0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, SPACE,
'\n', SPACE, SPACE, SPACE, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, SPACE, '!', '"', '#', '$', '%', '&', '\'',
'(', ')', '*', '+', ',', '-', '.', '/', DIGIT, DIGIT,
DIGIT, DIGIT, DIGIT, DIGIT, DIGIT, DIGIT, DIGIT, DIGIT, ':', ';',
'<', '=', '>', '?', '@', IDENT, IDENT, IDENT, IDENT, IDENT,
IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT,
IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT,
IDENT, '[', '\\', ']', '^', IDENT, 0x00, IDENT, IDENT, IDENT,
IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT,
IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT, IDENT,
IDENT, IDENT, IDENT, '{', '|', '}', '~', 0x00, 0x00, 0x00,
};
// Lookup tables which translate a given string literal to a token and backwards
static const std::unordered_map<tokenid, std::string_view> token_lookup = {
{ tokenid::end_of_file, "end of file" },
{ tokenid::exclaim, "!" },
{ tokenid::hash, "#" },
{ tokenid::dollar, "$" },
{ tokenid::percent, "%" },
{ tokenid::ampersand, "&" },
{ tokenid::parenthesis_open, "(" },
{ tokenid::parenthesis_close, ")" },
{ tokenid::star, "*" },
{ tokenid::plus, "+" },
{ tokenid::comma, "," },
{ tokenid::minus, "-" },
{ tokenid::dot, "." },
{ tokenid::slash, "/" },
{ tokenid::colon, ":" },
{ tokenid::semicolon, ";" },
{ tokenid::less, "<" },
{ tokenid::equal, "=" },
{ tokenid::greater, ">" },
{ tokenid::question, "?" },
{ tokenid::at, "@" },
{ tokenid::bracket_open, "[" },
{ tokenid::backslash, "\\" },
{ tokenid::bracket_close, "]" },
{ tokenid::caret, "^" },
{ tokenid::brace_open, "{" },
{ tokenid::pipe, "|" },
{ tokenid::brace_close, "}" },
{ tokenid::tilde, "~" },
{ tokenid::exclaim_equal, "!=" },
{ tokenid::percent_equal, "%=" },
{ tokenid::ampersand_ampersand, "&&" },
{ tokenid::ampersand_equal, "&=" },
{ tokenid::star_equal, "*=" },
{ tokenid::plus_plus, "++" },
{ tokenid::plus_equal, "+=" },
{ tokenid::minus_minus, "--" },
{ tokenid::minus_equal, "-=" },
{ tokenid::arrow, "->" },
{ tokenid::ellipsis, "..." },
{ tokenid::slash_equal, "|=" },
{ tokenid::colon_colon, "::" },
{ tokenid::less_less_equal, "<<=" },
{ tokenid::less_less, "<<" },
{ tokenid::less_equal, "<=" },
{ tokenid::equal_equal, "==" },
{ tokenid::greater_greater_equal, ">>=" },
{ tokenid::greater_greater, ">>" },
{ tokenid::greater_equal, ">=" },
{ tokenid::caret_equal, "^=" },
{ tokenid::pipe_equal, "|=" },
{ tokenid::pipe_pipe, "||" },
{ tokenid::identifier, "identifier" },
{ tokenid::reserved, "reserved word" },
{ tokenid::true_literal, "true" },
{ tokenid::false_literal, "false" },
{ tokenid::int_literal, "integral literal" },
{ tokenid::uint_literal, "integral literal" },
{ tokenid::float_literal, "floating point literal" },
{ tokenid::double_literal, "floating point literal" },
{ tokenid::string_literal, "string literal" },
{ tokenid::namespace_, "namespace" },
{ tokenid::struct_, "struct" },
{ tokenid::technique, "technique" },
{ tokenid::pass, "pass" },
{ tokenid::for_, "for" },
{ tokenid::while_, "while" },
{ tokenid::do_, "do" },
{ tokenid::if_, "if" },
{ tokenid::else_, "else" },
{ tokenid::switch_, "switch" },
{ tokenid::case_, "case" },
{ tokenid::default_, "default" },
{ tokenid::break_, "break" },
{ tokenid::continue_, "continue" },
{ tokenid::return_, "return" },
{ tokenid::discard_, "discard" },
{ tokenid::extern_, "extern" },
{ tokenid::static_, "static" },
{ tokenid::uniform_, "uniform" },
{ tokenid::volatile_, "volatile" },
{ tokenid::precise, "precise" },
{ tokenid::groupshared, "groupshared" },
{ tokenid::in, "in" },
{ tokenid::out, "out" },
{ tokenid::inout, "inout" },
{ tokenid::const_, "const" },
{ tokenid::linear, "linear" },
{ tokenid::noperspective, "noperspective" },
{ tokenid::centroid, "centroid" },
{ tokenid::nointerpolation, "nointerpolation" },
{ tokenid::void_, "void" },
{ tokenid::bool_, "bool" },
{ tokenid::bool2, "bool2" },
{ tokenid::bool3, "bool3" },
{ tokenid::bool4, "bool4" },
{ tokenid::bool2x2, "bool2x2" },
{ tokenid::bool2x3, "bool2x3" },
{ tokenid::bool2x4, "bool2x4" },
{ tokenid::bool3x2, "bool3x2" },
{ tokenid::bool3x3, "bool3x3" },
{ tokenid::bool3x4, "bool3x4" },
{ tokenid::bool4x2, "bool4x2" },
{ tokenid::bool4x3, "bool4x3" },
{ tokenid::bool4x4, "bool4x4" },
{ tokenid::int_, "int" },
{ tokenid::int2, "int2" },
{ tokenid::int3, "int3" },
{ tokenid::int4, "int4" },
{ tokenid::int2x2, "int2x2" },
{ tokenid::int2x3, "int2x3" },
{ tokenid::int2x4, "int2x4" },
{ tokenid::int3x2, "int3x2" },
{ tokenid::int3x3, "int3x3" },
{ tokenid::int3x4, "int3x4" },
{ tokenid::int4x2, "int4x2" },
{ tokenid::int4x3, "int4x3" },
{ tokenid::int4x4, "int4x4" },
{ tokenid::min16int, "min16int" },
{ tokenid::min16int2, "min16int2" },
{ tokenid::min16int3, "min16int3" },
{ tokenid::min16int4, "min16int4" },
{ tokenid::uint_, "uint" },
{ tokenid::uint2, "uint2" },
{ tokenid::uint3, "uint3" },
{ tokenid::uint4, "uint4" },
{ tokenid::uint2x2, "uint2x2" },
{ tokenid::uint2x3, "uint2x3" },
{ tokenid::uint2x4, "uint2x4" },
{ tokenid::uint3x2, "uint3x2" },
{ tokenid::uint3x3, "uint3x3" },
{ tokenid::uint3x4, "uint3x4" },
{ tokenid::uint4x2, "uint4x2" },
{ tokenid::uint4x3, "uint4x3" },
{ tokenid::uint4x4, "uint4x4" },
{ tokenid::min16uint, "min16uint" },
{ tokenid::min16uint2, "min16uint2" },
{ tokenid::min16uint3, "min16uint3" },
{ tokenid::min16uint4, "min16uint4" },
{ tokenid::float_, "float" },
{ tokenid::float2, "float2" },
{ tokenid::float3, "float3" },
{ tokenid::float4, "float4" },
{ tokenid::float2x2, "float2x2" },
{ tokenid::float2x3, "float2x3" },
{ tokenid::float2x4, "float2x4" },
{ tokenid::float3x2, "float3x2" },
{ tokenid::float3x3, "float3x3" },
{ tokenid::float3x4, "float3x4" },
{ tokenid::float4x2, "float4x2" },
{ tokenid::float4x3, "float4x3" },
{ tokenid::float4x4, "float4x4" },
{ tokenid::min16float, "min16float" },
{ tokenid::min16float2, "min16float2" },
{ tokenid::min16float3, "min16float3" },
{ tokenid::min16float4, "min16float4" },
{ tokenid::vector, "vector" },
{ tokenid::matrix, "matrix" },
{ tokenid::string_, "string" },
{ tokenid::texture1d, "texture1D" },
{ tokenid::texture2d, "texture2D" },
{ tokenid::texture3d, "texture3D" },
{ tokenid::sampler1d, "sampler1D" },
{ tokenid::sampler2d, "sampler2D" },
{ tokenid::sampler3d, "sampler3D" },
{ tokenid::storage1d, "storage1D" },
{ tokenid::storage2d, "storage2D" },
{ tokenid::storage3d, "storage3D" },
};
static const std::unordered_map<std::string_view, tokenid> keyword_lookup = {
{ "asm", tokenid::reserved },
{ "asm_fragment", tokenid::reserved },
{ "auto", tokenid::reserved },
{ "bool", tokenid::bool_ },
{ "bool2", tokenid::bool2 },
{ "bool2x1", tokenid::bool2 },
{ "bool2x2", tokenid::bool2x2 },
{ "bool2x3", tokenid::bool2x3 },
{ "bool2x4", tokenid::bool2x4 },
{ "bool3", tokenid::bool3 },
{ "bool3x1", tokenid::bool3 },
{ "bool3x2", tokenid::bool3x2 },
{ "bool3x3", tokenid::bool3x3 },
{ "bool3x4", tokenid::bool3x4 },
{ "bool4", tokenid::bool4 },
{ "bool4x1", tokenid::bool4 },
{ "bool4x2", tokenid::bool4x2 },
{ "bool4x3", tokenid::bool4x3 },
{ "bool4x4", tokenid::bool4x4 },
{ "break", tokenid::break_ },
{ "case", tokenid::case_ },
{ "cast", tokenid::reserved },
{ "catch", tokenid::reserved },
{ "centroid", tokenid::reserved },
{ "char", tokenid::reserved },
{ "class", tokenid::reserved },
{ "column_major", tokenid::reserved },
{ "compile", tokenid::reserved },
{ "const", tokenid::const_ },
{ "const_cast", tokenid::reserved },
{ "continue", tokenid::continue_ },
{ "default", tokenid::default_ },
{ "delete", tokenid::reserved },
{ "discard", tokenid::discard_ },
{ "do", tokenid::do_ },
{ "double", tokenid::reserved },
{ "dword", tokenid::uint_ },
{ "dword2", tokenid::uint2 },
{ "dword2x1", tokenid::uint2 },
{ "dword2x2", tokenid::uint2x2 },
{ "dword2x3", tokenid::uint2x3 },
{ "dword2x4", tokenid::uint2x4 },
{ "dword3", tokenid::uint3, },
{ "dword3x1", tokenid::uint3 },
{ "dword3x2", tokenid::uint3x2 },
{ "dword3x3", tokenid::uint3x3 },
{ "dword3x4", tokenid::uint3x4 },
{ "dword4", tokenid::uint4 },
{ "dword4x1", tokenid::uint4 },
{ "dword4x2", tokenid::uint4x2 },
{ "dword4x3", tokenid::uint4x3 },
{ "dword4x4", tokenid::uint4x4 },
{ "dynamic_cast", tokenid::reserved },
{ "else", tokenid::else_ },
{ "enum", tokenid::reserved },
{ "explicit", tokenid::reserved },
{ "extern", tokenid::extern_ },
{ "external", tokenid::reserved },
{ "false", tokenid::false_literal },
{ "FALSE", tokenid::false_literal },
{ "float", tokenid::float_ },
{ "float2", tokenid::float2 },
{ "float2x1", tokenid::float2 },
{ "float2x2", tokenid::float2x2 },
{ "float2x3", tokenid::float2x3 },
{ "float2x4", tokenid::float2x4 },
{ "float3", tokenid::float3 },
{ "float3x1", tokenid::float3 },
{ "float3x2", tokenid::float3x2 },
{ "float3x3", tokenid::float3x3 },
{ "float3x4", tokenid::float3x4 },
{ "float4", tokenid::float4 },
{ "float4x1", tokenid::float4 },
{ "float4x2", tokenid::float4x2 },
{ "float4x3", tokenid::float4x3 },
{ "float4x4", tokenid::float4x4 },
{ "for", tokenid::for_ },
{ "foreach", tokenid::reserved },
{ "friend", tokenid::reserved },
{ "globallycoherent", tokenid::reserved },
{ "goto", tokenid::reserved },
{ "groupshared", tokenid::groupshared },
{ "half", tokenid::reserved },
{ "half2", tokenid::reserved },
{ "half2x1", tokenid::reserved },
{ "half2x2", tokenid::reserved },
{ "half2x3", tokenid::reserved },
{ "half2x4", tokenid::reserved },
{ "half3", tokenid::reserved },
{ "half3x1", tokenid::reserved },
{ "half3x2", tokenid::reserved },
{ "half3x3", tokenid::reserved },
{ "half3x4", tokenid::reserved },
{ "half4", tokenid::reserved },
{ "half4x1", tokenid::reserved },
{ "half4x2", tokenid::reserved },
{ "half4x3", tokenid::reserved },
{ "half4x4", tokenid::reserved },
{ "if", tokenid::if_ },
{ "in", tokenid::in },
{ "inline", tokenid::reserved },
{ "inout", tokenid::inout },
{ "int", tokenid::int_ },
{ "int2", tokenid::int2 },
{ "int2x1", tokenid::int2 },
{ "int2x2", tokenid::int2x2 },
{ "int2x3", tokenid::int2x3 },
{ "int2x4", tokenid::int2x4 },
{ "int3", tokenid::int3 },
{ "int3x1", tokenid::int3 },
{ "int3x2", tokenid::int3x2 },
{ "int3x3", tokenid::int3x3 },
{ "int3x4", tokenid::int3x4 },
{ "int4", tokenid::int4 },
{ "int4x1", tokenid::int4 },
{ "int4x2", tokenid::int4x2 },
{ "int4x3", tokenid::int4x3 },
{ "int4x4", tokenid::int4x4 },
{ "interface", tokenid::reserved },
{ "linear", tokenid::linear },
{ "long", tokenid::reserved },
{ "matrix", tokenid::matrix },
{ "min16float", tokenid::min16float },
{ "min16float2", tokenid::min16float2 },
{ "min16float3", tokenid::min16float3 },
{ "min16float4", tokenid::min16float4 },
{ "min16int", tokenid::min16int },
{ "min16int2", tokenid::min16int2 },
{ "min16int3", tokenid::min16int3 },
{ "min16int4", tokenid::min16int4 },
{ "min16uint", tokenid::min16uint },
{ "min16uint2", tokenid::min16uint2 },
{ "min16uint3", tokenid::min16uint3 },
{ "min16uint4", tokenid::min16uint4 },
{ "mutable", tokenid::reserved },
{ "namespace", tokenid::namespace_ },
{ "new", tokenid::reserved },
{ "noinline", tokenid::reserved },
{ "nointerpolation", tokenid::nointerpolation },
{ "noperspective", tokenid::noperspective },
{ "operator", tokenid::reserved },
{ "out", tokenid::out },
{ "packed", tokenid::reserved },
{ "packoffset", tokenid::reserved },
{ "pass", tokenid::pass },
{ "precise", tokenid::precise },
{ "private", tokenid::reserved },
{ "protected", tokenid::reserved },
{ "public", tokenid::reserved },
{ "register", tokenid::reserved },
{ "reinterpret_cast", tokenid::reserved },
{ "restrict", tokenid::reserved },
{ "return", tokenid::return_ },
{ "row_major", tokenid::reserved },
{ "sample", tokenid::reserved },
{ "sampler", tokenid::sampler2d },
{ "sampler1D", tokenid::sampler1d },
{ "sampler1DArray", tokenid::reserved },
{ "sampler2D", tokenid::sampler2d },
{ "sampler2DArray", tokenid::reserved },
{ "sampler2DMS", tokenid::reserved },
{ "sampler2DMSArray", tokenid::reserved },
{ "sampler3D", tokenid::sampler3d },
{ "sampler_state", tokenid::reserved },
{ "samplerCube", tokenid::reserved },
{ "samplerCubeArray", tokenid::reserved },
{ "samplerCUBE", tokenid::reserved },
{ "samplerRect", tokenid::reserved },
{ "samplerRECT", tokenid::reserved },
{ "SamplerState", tokenid::reserved },
{ "storage", tokenid::storage2d },
{ "storage1D", tokenid::storage1d },
{ "storage2D", tokenid::storage2d },
{ "storage3D", tokenid::storage3d },
{ "shared", tokenid::reserved },
{ "short", tokenid::reserved },
{ "signed", tokenid::reserved },
{ "sizeof", tokenid::reserved },
{ "snorm", tokenid::reserved },
{ "static", tokenid::static_ },
{ "static_cast", tokenid::reserved },
{ "string", tokenid::string_ },
{ "struct", tokenid::struct_ },
{ "switch", tokenid::switch_ },
{ "technique", tokenid::technique },
{ "template", tokenid::reserved },
{ "texture", tokenid::texture2d },
{ "Texture1D", tokenid::reserved },
{ "texture1D", tokenid::texture1d },
{ "Texture1DArray", tokenid::reserved },
{ "Texture2D", tokenid::reserved },
{ "texture2D", tokenid::texture2d },
{ "Texture2DArray", tokenid::reserved },
{ "Texture2DMS", tokenid::reserved },
{ "Texture2DMSArray", tokenid::reserved },
{ "Texture3D", tokenid::reserved },
{ "texture3D", tokenid::texture3d },
{ "textureCUBE", tokenid::reserved },
{ "TextureCube", tokenid::reserved },
{ "TextureCubeArray", tokenid::reserved },
{ "textureRECT", tokenid::reserved },
{ "this", tokenid::reserved },
{ "true", tokenid::true_literal },
{ "TRUE", tokenid::true_literal },
{ "try", tokenid::reserved },
{ "typedef", tokenid::reserved },
{ "uint", tokenid::uint_ },
{ "uint2", tokenid::uint2 },
{ "uint2x1", tokenid::uint2 },
{ "uint2x2", tokenid::uint2x2 },
{ "uint2x3", tokenid::uint2x3 },
{ "uint2x4", tokenid::uint2x4 },
{ "uint3", tokenid::uint3 },
{ "uint3x1", tokenid::uint3 },
{ "uint3x2", tokenid::uint3x2 },
{ "uint3x3", tokenid::uint3x3 },
{ "uint3x4", tokenid::uint3x4 },
{ "uint4", tokenid::uint4 },
{ "uint4x1", tokenid::uint4 },
{ "uint4x2", tokenid::uint4x2 },
{ "uint4x3", tokenid::uint4x3 },
{ "uint4x4", tokenid::uint4x4 },
{ "uniform", tokenid::uniform_ },
{ "union", tokenid::reserved },
{ "unorm", tokenid::reserved },
{ "unsigned", tokenid::reserved },
{ "using", tokenid::reserved },
{ "vector", tokenid::vector },
{ "virtual", tokenid::reserved },
{ "void", tokenid::void_ },
{ "volatile", tokenid::volatile_ },
{ "while", tokenid::while_ }
};
static const std::unordered_map<std::string_view, tokenid> pp_directive_lookup = {
{ "define", tokenid::hash_def },
{ "undef", tokenid::hash_undef },
{ "if", tokenid::hash_if },
{ "ifdef", tokenid::hash_ifdef },
{ "ifndef", tokenid::hash_ifndef },
{ "else", tokenid::hash_else },
{ "elif", tokenid::hash_elif },
{ "endif", tokenid::hash_endif },
{ "error", tokenid::hash_error },
{ "warning", tokenid::hash_warning },
{ "pragma", tokenid::hash_pragma },
{ "include", tokenid::hash_include },
};
static inline bool is_octal_digit(char c)
{
return static_cast<unsigned>(c - '0') < 8;
}
static inline bool is_decimal_digit(char c)
{
return static_cast<unsigned>(c - '0') < 10;
}
static inline bool is_hexadecimal_digit(char c)
{
return is_decimal_digit(c) || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
}
static bool is_digit(char c, int radix)
{
switch (radix)
{
case 8:
return is_octal_digit(c);
case 10:
return is_decimal_digit(c);
case 16:
return is_hexadecimal_digit(c);
}
return false;
}
static long long octal_to_decimal(long long n)
{
long long m = 0;
while (n != 0)
{
m *= 8;
m += n & 7;
n >>= 3;
}
while (m != 0)
{
n *= 10;
n += m & 7;
m >>= 3;
}
return n;
}
std::string reshadefx::token::id_to_name(tokenid id)
{
const auto it = token_lookup.find(id);
if (it != token_lookup.end())
return std::string(it->second);
return "unknown";
}
reshadefx::token reshadefx::lexer::lex()
{
bool is_at_line_begin = _cur_location.column <= 1;
token tok;
next_token:
// Reset token data
tok.location = _cur_location;
tok.offset = input_offset();
tok.length = 1;
tok.literal_as_double = 0;
tok.literal_as_string.clear();
assert(_cur <= _end);
// Do a character type lookup for the current character
switch (type_lookup[uint8_t(*_cur)])
{
case 0xFF: // EOF
tok.id = tokenid::end_of_file;
return tok;
case SPACE:
skip_space();
if (_ignore_whitespace || is_at_line_begin || *_cur == '\n')
goto next_token;
tok.id = tokenid::space;
tok.length = input_offset() - tok.offset;
return tok;
case '\n':
_cur++;
_cur_location.line++;
_cur_location.column = 1;
is_at_line_begin = true;
if (_ignore_whitespace)
goto next_token;
tok.id = tokenid::end_of_line;
return tok;
case DIGIT:
parse_numeric_literal(tok);
break;
case IDENT:
parse_identifier(tok);
break;
case '!':
if (_cur[1] == '=')
tok.id = tokenid::exclaim_equal,
tok.length = 2;
else
tok.id = tokenid::exclaim;
break;
case '"':
parse_string_literal(tok, _escape_string_literals);
break;
case '#':
if (is_at_line_begin)
{
if (!parse_pp_directive(tok) || _ignore_pp_directives)
{
skip_to_next_line();
goto next_token;
}
} // These braces are important so the 'else' is matched to the right 'if' statement
else
tok.id = tokenid::hash;
break;
case '$':
tok.id = tokenid::dollar;
break;
case '%':
if (_cur[1] == '=')
tok.id = tokenid::percent_equal,
tok.length = 2;
else
tok.id = tokenid::percent;
break;
case '&':
if (_cur[1] == '&')
tok.id = tokenid::ampersand_ampersand,
tok.length = 2;
else if (_cur[1] == '=')
tok.id = tokenid::ampersand_equal,
tok.length = 2;
else
tok.id = tokenid::ampersand;
break;
case '(':
tok.id = tokenid::parenthesis_open;
break;
case ')':
tok.id = tokenid::parenthesis_close;
break;
case '*':
if (_cur[1] == '=')
tok.id = tokenid::star_equal,
tok.length = 2;
else
tok.id = tokenid::star;
break;
case '+':
if (_cur[1] == '+')
tok.id = tokenid::plus_plus,
tok.length = 2;
else if (_cur[1] == '=')
tok.id = tokenid::plus_equal,
tok.length = 2;
else
tok.id = tokenid::plus;
break;
case ',':
tok.id = tokenid::comma;
break;
case '-':
if (_cur[1] == '-')
tok.id = tokenid::minus_minus,
tok.length = 2;
else if (_cur[1] == '=')
tok.id = tokenid::minus_equal,
tok.length = 2;
else if (_cur[1] == '>')
tok.id = tokenid::arrow,
tok.length = 2;
else
tok.id = tokenid::minus;
break;
case '.':
if (type_lookup[uint8_t(_cur[1])] == DIGIT)
parse_numeric_literal(tok);
else if (_cur[1] == '.' && _cur[2] == '.')
tok.id = tokenid::ellipsis,
tok.length = 3;
else
tok.id = tokenid::dot;
break;
case '/':
if (_cur[1] == '/')
{
skip_to_next_line();
if (_ignore_comments)
goto next_token;
tok.id = tokenid::single_line_comment;
tok.length = input_offset() - tok.offset;
return tok;
}
else if (_cur[1] == '*')
{
while (_cur < _end)
{
if (*_cur == '\n')
{
_cur_location.line++;
_cur_location.column = 1;
}
else if (_cur[0] == '*' && _cur[1] == '/')
{
skip(2);
break;
}
skip(1);
}
if (_ignore_comments)
goto next_token;
tok.id = tokenid::multi_line_comment;
tok.length = input_offset() - tok.offset;
return tok;
}
else if (_cur[1] == '=')
tok.id = tokenid::slash_equal,
tok.length = 2;
else
tok.id = tokenid::slash;
break;
case ':':
if (_cur[1] == ':')
tok.id = tokenid::colon_colon,
tok.length = 2;
else
tok.id = tokenid::colon;
break;
case ';':
tok.id = tokenid::semicolon;
break;
case '<':
if (_cur[1] == '<')
if (_cur[2] == '=')
tok.id = tokenid::less_less_equal,
tok.length = 3;
else
tok.id = tokenid::less_less,
tok.length = 2;
else if (_cur[1] == '=')
tok.id = tokenid::less_equal,
tok.length = 2;
else
tok.id = tokenid::less;
break;
case '=':
if (_cur[1] == '=')
tok.id = tokenid::equal_equal,
tok.length = 2;
else
tok.id = tokenid::equal;
break;
case '>':
if (_cur[1] == '>')
if (_cur[2] == '=')
tok.id = tokenid::greater_greater_equal,
tok.length = 3;
else
tok.id = tokenid::greater_greater,
tok.length = 2;
else if (_cur[1] == '=')
tok.id = tokenid::greater_equal,
tok.length = 2;
else
tok.id = tokenid::greater;
break;
case '?':
tok.id = tokenid::question;
break;
case '@':
tok.id = tokenid::at;
break;
case '[':
tok.id = tokenid::bracket_open;
break;
case '\\':
if (_cur[1] == '\n' || (_cur[1] == '\r' && _cur[2] == '\n'))
{
// Skip to next line if current line ends with a backslash
skip_space();
if (_ignore_whitespace)
goto next_token;
tok.id = tokenid::space;
tok.length = input_offset() - tok.offset;
return tok;
}
tok.id = tokenid::backslash;
break;
case ']':
tok.id = tokenid::bracket_close;
break;
case '^':
if (_cur[1] == '=')
tok.id = tokenid::caret_equal,
tok.length = 2;
else
tok.id = tokenid::caret;
break;
case '{':
tok.id = tokenid::brace_open;
break;
case '|':
if (_cur[1] == '=')
tok.id = tokenid::pipe_equal,
tok.length = 2;
else if (_cur[1] == '|')
tok.id = tokenid::pipe_pipe,
tok.length = 2;
else
tok.id = tokenid::pipe;
break;
case '}':
tok.id = tokenid::brace_close;
break;
case '~':
tok.id = tokenid::tilde;
break;
default:
tok.id = tokenid::unknown;
break;
}
skip(tok.length);
return tok;
}
void reshadefx::lexer::skip(size_t length)
{
_cur += length;
_cur_location.column += static_cast<unsigned int>(length);
}
void reshadefx::lexer::skip_space()
{
// Skip each character until a space is found
while (_cur < _end)
{
if (_cur[0] == '\\' && (_cur[1] == '\n' || (_cur[1] == '\r' && _cur[2] == '\n')))
{
skip(_cur[1] == '\r' ? 3 : 2);
_cur_location.line++;
_cur_location.column = 1;
continue;
}
if (type_lookup[uint8_t(*_cur)] == SPACE)
skip(1);
else
break;
}
}
void reshadefx::lexer::skip_to_next_line()
{
// Skip each character until a new line feed is found
while (*_cur != '\n' && _cur < _end)
{
#if 0
if (_cur[0] == '\\' && (_cur[1] == '\n' || (_cur[1] == '\r' && _cur[2] == '\n')))
{
skip(_cur[1] == '\r' ? 3 : 2);
_cur_location.line++;
_cur_location.column = 1;
continue;
}
#endif
skip(1);
}
}
void reshadefx::lexer::reset_to_offset(size_t offset)
{
assert(offset < _input.size());
_cur = _input.data() + offset;
}
void reshadefx::lexer::parse_identifier(token &tok) const
{
auto *const begin = _cur, *end = begin;
// Skip to the end of the identifier sequence
while (type_lookup[uint8_t(*end)] == IDENT || type_lookup[uint8_t(*end)] == DIGIT)
end++;
tok.id = tokenid::identifier;
tok.offset = input_offset();
tok.length = end - begin;
tok.literal_as_string.assign(begin, end);
if (_ignore_keywords)
return;
if (const auto it = keyword_lookup.find(tok.literal_as_string);
it != keyword_lookup.end())
tok.id = it->second;
}
bool reshadefx::lexer::parse_pp_directive(token &tok)
{
skip(1); // Skip the '#'
skip_space(); // Skip any space between the '#' and directive
parse_identifier(tok);
if (const auto it = pp_directive_lookup.find(tok.literal_as_string);
it != pp_directive_lookup.end())
{
tok.id = it->second;
return true;
}
else if (!_ignore_line_directives && tok.literal_as_string == "line") // The #line directive needs special handling
{
skip(tok.length); // The 'parse_identifier' does not update the pointer to the current character, so do that now
skip_space();
parse_numeric_literal(tok);
skip(tok.length);
_cur_location.line = tok.literal_as_int;
// Need to subtract one since the line containing #line does not count into the statistics
if (_cur_location.line != 0)
_cur_location.line--;
skip_space();
// Check if this #line directive has an file name attached to it
if (_cur[0] == '"')
{
token temptok;
parse_string_literal(temptok, false);
_cur_location.source = std::move(temptok.literal_as_string);
}
// Do not return the #line directive as token to the caller
return false;
}
tok.id = tokenid::hash_unknown;
return true;
}
void reshadefx::lexer::parse_string_literal(token &tok, bool escape)
{
auto *const begin = _cur, *end = begin + 1; // Skip first quote character right away
for (auto c = *end; c != '"'; c = *++end)
{
if (c == '\n' || end >= _end)
{
// Line feed reached, the string literal is done (technically this should be an error, but the lexer does not report errors, so ignore it)
end--;
if (end[0] == '\r') end--;
break;
}
if (c == '\r')
{
// Silently ignore carriage return characters
continue;
}
if (unsigned int n = (end[1] == '\r' && end + 2 < _end) ? 2 : 1;
c == '\\' && end[n] == '\n')
{
// Escape character found at end of line, the string literal continues on to the next line
end += n;
_cur_location.line++;
continue;
}
// Handle escape sequences
if (c == '\\' && escape)
{
unsigned int n = 0;
// Any character following the '\' is not parsed as usual, so increment pointer here (this makes sure '\"' does not abort the outer loop as well)
switch (c = *++end)
{
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
for (unsigned int i = 0; i < 3 && is_octal_digit(*end) && end < _end; i++)
{
c = *end++;
n = (n << 3) | (c - '0');
}
// For simplicity the number is limited to what fits in a single character
c = n & 0xFF;
// The octal parsing loop above incremented one pass the escape sequence, so step back
end--;
break;
case 'a':
c = '\a';
break;
case 'b':
c = '\b';
break;
case 'f':
c = '\f';
break;
case 'n':
c = '\n';
break;
case 'r':
c = '\r';
break;
case 't':
c = '\t';
break;
case 'v':
c = '\v';
break;
case 'x':
if (is_hexadecimal_digit(*++end))
{
while (is_hexadecimal_digit(*end) && end < _end)
{
c = *end++;
n = (n << 4) | (is_decimal_digit(c) ? (c - '0') : (c - 55 - 32 * (c & 0x20)));
}
// For simplicity the number is limited to what fits in a single character
c = n & 0xFF;
}
// The hexadecimal parsing loop and check above incremented one pass the escape sequence, so step back
end--;
break;
}
}
tok.literal_as_string += c;
}
tok.id = tokenid::string_literal;