Finished parser

1 files changed, 98 insertions, 0 deletions

diff --git a/c_compiler/src/c_lexer.flex b/c_compiler/src/c_lexer.flex
new file mode 100644
index 0000000..c8ca90a
--- /dev/null
+++ b/c_compiler/src/c_lexer.flex
@@ -0,0 +1,98 @@
+%option noyywrap
+
+%{
+// Avoid error "error: fileno was not declared in this scope"
+extern "C" int fileno(FILE *stream);
+
+#include "c_parser.tab.hpp"
+
+%}
+
+KEYWORD auto|double|int|struct|break|else|long|switch|case|enum|register|typedef|char|extern|return|union|const|float|short|unsigned|continue|for|signed|void|default|goto|sizeof|volatile|do|if|static|while
+
+IDENTIFIER [_a-zA-Z][_a-zA-Z0-9]*
+
+OPERATOR [.][.][.]|[<>][<>][=]|[-][-]|[+][+]|[|][|]|[#][#]|[&][&]|[+\-*\/<>=!%^|&][=]|[<][<]|[->][>]|[<>&=+\/\-*(){}\[\]\.,%~!?:|^;]
+
+ASSIGNMENT_OPERATOR (([<>][<>]|[*\/%+\-&^|])[=]|[=])
+
+FRACTIONALCONSTANT (([0-9]*\.[0-9]+)|([0-9]+\.))
+EXPONENTPART ([eE][+-]?[0-9]+)
+
+FLOATINGSUFFI X ([flFL])
+INTEGERSUFFIX ([uU][lL]|[lL][uU]|[uUlL])
+
+DECIMALCONSTANT ([1-9][0-9]*)
+OCTALCONSTANT ([0][0-7]*)
+HEXCONSTANT ([0][xX][0-9A-Fa-f]+)
+
+CHARCONSTANT ('(([\\]['])|([^']))+')
+
+STRINGLITERAL ["](([\\]["])|([^"]))*["]
+
+WHITESPACE [ \t\r\n]+
+
+PREPROC [#][ ][0-9]+[ ]{STRINGLITERAL}[ 0-9]*
+
+ALL .
+
+%%
+
+typedef|extern|static|auto|register	{ return T_STRG_SPEC; }
+void|char|short|int|long|float|double|signed|unsigned	      { return T_TYPE_SPEC; }
+const|volatile						      { return T_TYPE_QUAL; }
+
+[;]		{ return T_SC; }
+[,]		{ return T_CMA; }
+[(]		{ return T_LRB; }
+[)]		{ return T_RRB; }
+[{]             { return T_LCB; }
+[}]             { return T_RCB; }
+[[]		{ return T_LSB; }
+[]]		{ return T_RSB; }
+[?]		{ return T_QU; }
+[:]		{ return T_COL; }
+[|][|]		{ return T_LOG_OR; }
+[&][&]		{ return T_LOG_AND; }
+[|]		{ return T_OR; }
+[\^]		{ return T_XOR; }
+[&]		{ return T_AND; }
+[=][=]		{ return T_EQUALITY_OP; }
+[!][=]		{ return T_EQUALITY_OP; }
+([<>][=])|[<>]	{ return T_REL_OP; }
+[<>][<>]	{ return T_SHIFT_OP; }
+[*] 		{ return T_MULT; }
+[\/]		{ return T_DIV; }
+[%]		{ return T_REM; }
+[~]		{ return T_TILDE; }
+[!]		{ return T_NOT; }
+[.]		{ return T_DOT; }
+[-][>]		{ return T_ARROW; }
+[+-][+-]	{ return T_INCDEC; }
+[+-]		{ return T_ADDSUB_OP; }
+[=]		{ yylval.string = new std::string(yytext); return T_EQ; }
+
+{ASSIGNMENT_OPERATOR} { yylval.string = new std::string(yytext); return T_ASSIGN_OPER; }
+
+if		{ return T_IF; }
+else		{ return T_ELSE; }
+return		{ return T_RETURN; }
+while		{ return T_WHILE; }
+do		{ return T_DO; }
+for		{ return T_FOR; }
+sizeof		{ return T_SIZEOF; }
+
+{IDENTIFIER}	{ yylval.string = new std::string(yytext); return T_IDENTIFIER; }
+
+({HEXCONSTANT}|{OCTALCONSTANT}|{DECIMALCONSTANT}){INTEGERSUFFIX}?	{ yylval.number = strtol(yytext, NULL, 0); return T_INT_CONST; }
+
+{WHITESPACE}		{ ; }
+
+.                   { fprintf(stderr, "Invalid token\n"); exit(1); }
+
+%%
+
+void yyerror(char const *s) {
+     fprintf (stderr, "Parse error : %s\n", s);
+     exit(1);
+}