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|
%{
#include "ast_types.hpp"
#include "lex.hpp"
#include <stdio.h>
%}
%option yylineno
%option noyywrap batch
%{
int rustbnf_forcetoken = 0;
//#define YY_DECL yy::parser::symbol_type yylex_inner()
#define YY_DECL int yylex_inner(YYSTYPE* lvalp, ParserContext& context)
YY_DECL;
// Wrap the real yylex with one that can yeild a pushbacked token
int yylex(YYSTYPE* lvalp, ParserContext& context) {
int rv = context.popback();
if(rv > 0) {
printf("--return %i\n", rv);
return rv;
}
else {
return yylex_inner(lvalp, context);
}
}
void handle_block_comment();
::std::string parse_escaped_string(const char* s);
::std::string handle_raw_string(const char* s);
%}
dec_digit [0-9_]
ident_c [a-zA-Z_]
int_suffix ([ui](size|8|16|32|64))?
%%
"//".*\n { if(yytext[2] == '/' && yytext[3] != '/') { lvalp->DOC_COMMENT = new ::std::string(yytext+1, strlen(yytext)-2); return DOC_COMMENT; } }
"//!".*\n { lvalp->SUPER_DOC_COMMENT = new ::std::string(yytext+1, strlen(yytext)-2); return SUPER_DOC_COMMENT; }
"/*" { handle_block_comment(); /* TODO: Handle doc comments */ }
\n /* */
\r /* */
[ \t] /* */
"mod" { return RWD_mod; }
"impl" { return RWD_impl; }
"use" { return RWD_use; }
"type" { return RWD_type; }
"static" { return RWD_static; }
"const" { return RWD_const; }
"struct" { return RWD_struct; }
"trait" { return RWD_trait; }
"enum" { return RWD_enum; }
"fn" { return RWD_fn; }
"as" { return RWD_as; }
"in" { return RWD_in; }
"mut" { return RWD_mut; }
"pub" { return RWD_pub; }
"where" { return RWD_where; }
"extern" { return RWD_extern; }
"crate" { return RWD_crate; }
"let" { return RWD_let; }
"ref" { return RWD_ref; }
"move" { return RWD_move; }
"box" { return RWD_box; }
"self" { return RWD_self; }
"super" { return RWD_super; }
"match" { return RWD_match; }
"if" { return RWD_if; }
"else" { return RWD_else; }
"loop" { return RWD_loop; }
"while" { return RWD_while; }
"for" { return RWD_for; }
"unsafe" { return RWD_unsafe; }
"return" { return RWD_return; }
"break" { return RWD_break; }
"continue" { return RWD_continue; }
"::" { return DOUBLECOLON; }
"->" { return THINARROW; }
"=>" { return FATARROW; }
"==" { return DOUBLEEQUAL; }
"!=" { return EXCLAMEQUAL; }
">=" { return GTEQUAL; }
"<=" { return LTEQUAL; }
"+=" { return PLUSEQUAL; }
"-=" { return MINUSEQUAL; }
"*=" { return STAREQUAL; }
"/=" { return SLASHEQUAL; }
"%=" { return PERCENTEQUAL; }
"|=" { return PIPEEQUAL; }
"&=" { return AMPEQUAL; }
"^=" { return CARETEQUAL; }
"&&" { return DOUBLEAMP; }
"||" { return DOUBLEPIPE; }
"<<" { return DOUBLELT; }
">>" { return DOUBLEGT; }
"<<=" { return DOUBLELTEQUAL; }
">>=" { return DOUBLEGTEQUAL; }
".." { return DOUBLEDOT; }
"..." { return TRIPLEDOT; }
"#!" { return HASHBANG; }
"?" { return *yytext; }
"#" { return *yytext; }
"@" { return *yytext; }
"$" { return *yytext; }
"&" { return *yytext; }
"|" { return *yytext; }
"^" { return *yytext; }
"!" { return *yytext; }
"." { return *yytext; }
":" { return *yytext; }
";" { return *yytext; }
"=" { return *yytext; }
"{"|"}" { return *yytext; }
"("|")" { return *yytext; }
"["|"]" { return *yytext; }
"<" { return *yytext; }
">" { return *yytext; }
"," { return *yytext; }
"/" { return *yytext; }
"%" { return *yytext; }
"*" { return *yytext; }
"+" { return *yytext; }
"-" { return *yytext; }
{ident_c}({ident_c}|[0-9])* {
if(*yytext == '_' && yytext[1] == 0)
return '_';
else {
lvalp->IDENT = new ::std::string( yytext );
return IDENT;
}
}
[0-9]{dec_digit}*"."{dec_digit}+(e[+\-]?{dec_digit}+)?(f32|f64)? { lvalp->FLOAT = strtod(yytext, NULL); return FLOAT; }
[0-9]{dec_digit}*(f32|f64) { lvalp->FLOAT = strtod(yytext, NULL); return FLOAT; }
[0-9]{dec_digit}*{int_suffix} { lvalp->INTEGER = strtoull(yytext, NULL, 0); return INTEGER; }
0x[0-9a-fA-F_]+{int_suffix} { lvalp->INTEGER = strtoull(yytext, NULL, 0); return INTEGER; }
0o[0-7]+{int_suffix} { lvalp->INTEGER = strtoull(yytext, NULL, 0); return INTEGER; }
0b[01_]+{int_suffix} { lvalp->INTEGER = strtoull(yytext, NULL, 0); return INTEGER; }
{ident_c}({ident_c}|[0-9])*"!" { lvalp->MACRO = new ::std::string(yytext, 0, strlen(yytext)-1); return MACRO; }
'{ident_c}{ident_c}* { lvalp->LIFETIME = new ::std::string(yytext, 1); return LIFETIME; }
b?'(.|\\'|\\[^']+|[\x80-\xFF]*)' { lvalp->CHARLIT = yytext[0]; return CHARLIT; }
b?\"(\\.|[^\\"]|\\\n)*\" { lvalp->STRING = new ::std::string( parse_escaped_string(yytext) ); return STRING; }
b?r#*\" { auto rs = handle_raw_string( (*yytext=='b' ? yytext+2 : yytext+1) ); lvalp->STRING = new ::std::string(rs); return STRING; }
. { fprintf(stderr, "\x1b[31m" "ERROR: %s:%d: Invalid character '%c'\x1b[0m\n", context.filename.c_str(), yylineno, *yytext); exit(1); }
%%
uint32_t parse_char_literal(const char *_s) {
const uint8_t* s = (const uint8_t*)_s;
assert(*s++ == '\'');
uint32_t rv = 0;
if( *s == '\\' ) {
s ++;
switch(*s)
{
case 'n': rv = '\0'; break;
case 'r': rv = '\0'; break;
case 'x':
rv = strtoul((const char*)(s+1), NULL, 16);
s += 2;
break;
//case 'u':
// rv = strtoul((const char*)(s+1), NULL, 16);
// s += 2;
// break;
default:
return 0;
}
}
else if( *s < 0x80 ) {
rv = *s;
}
else {
fprintf(stderr, "TODO: UTF-8 char literals");
exit(1);
}
s ++;
if( *s != '\'' ) {
exit(1);
}
assert(*s == '\0');
return rv;
}
::std::string parse_escaped_string(const char* s) {
printf("parse_escaped_string(%s)\n", s);
if( *s == 'b' ) {
s ++;
}
assert(*s++ == '"');
::std::string rv;
for( ; *s != '"'; s ++ )
{
if( *s == '\\' )
{
s ++;
switch(*s)
{
case 'n': rv += '\n'; break;
case 'r': rv += '\r'; break;
case 't': rv += '\t'; break;
case '"': rv += '"'; break;
case '0': rv += '\0'; break;
case '\\': rv += '\\'; break;
case '\'': rv += '\''; break;
case '\n':
while( isblank(*s) )
s ++;
s --;
break;
case 'x':
rv += (char)strtoul((const char*)(s+1), NULL, 16);
s += 2;
break;
case 'u': {
char *out;
assert(s[1] == '{');
rv += (char)strtoul((const char*)(s+2), &out, 16);
s = out;
assert(*s == '}');
break; }
default:
fprintf(stderr, "Unknown escape code '\\%c' in string\n", *s);
exit(1);
}
}
else if( *s == '\0' ) {
// wut?
fprintf(stderr, "Unexpected EOS\n");
exit(1);
}
else {
rv += *s;
}
}
assert(*s++ == '"');
assert(*s == '\0');
return rv;
}
// Thanks stackoverflow: http://www.lysator.liu.se/c/ANSI-C-grammar-l.html
void handle_block_comment() {
char c, c1;
loop:
while ((c = yyinput()) != '*' && c != 0) {
// putchar(c);
}
if ((c1 = yyinput()) != '/' && c != 0) {
unput(c1);
goto loop;
}
//if (c != 0)
// putchar(c1);
}
::std::string handle_raw_string(const char* s) {
int num_hash = 0;
for(; *s == '#'; s++)
num_hash ++;
assert(*s == '"');
printf("handle_raw_string - num_hash=%i\n", num_hash);
::std::string rv;
for(;;)
{
char c;
if( (c = yyinput()) == '"' ) {
if( num_hash == 0 )
break;
int i;
for(i = 0; i < num_hash; i ++) {
if( (c = yyinput()) != '#' )
break;
}
// Found `num_hash` '#' characters in a row, break out
if( i == num_hash ) {
break;
}
unput(c);
// Didn't find enough, append to output
rv += '"';
while(i--) rv += '#';
}
else if( c <= 0 ) {
break;
}
else {
rv += c;
}
}
return rv;
}
|
