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/*===-- Lexer.l - Scanner for Stacker language -----------------*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Reid Spencer and donated to the LLVM research
// group and is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the flex scanner for Stacker languages files.
//
//===----------------------------------------------------------------------===*/
%option prefix="Stacker"
%option yylineno
%option nostdinit
%option never-interactive
%option batch
%option noyywrap
%option nodefault
%option 8bit
%option outfile="Lexer.cpp"
%option ecs
%option noreject
%option noyymore
%{
#include "StackerCompiler.h"
#include "StackerParser.h"
/* Conversion of text ints to binary */
static int64_t IntToVal(const char *Buffer) {
int64_t Result = 0;
for (; *Buffer; Buffer++) {
int64_t OldRes = Result;
Result *= 10;
Result += *Buffer-'0';
if (Result < OldRes) // Uh, oh, overflow detected!!!
StackerCompiler::ThrowException("constant bigger than 64 bits detected!");
}
return Result;
}
/* Conversion of text hexadecimal ints to binary */
static int64_t HexIntToVal(const char *Buffer) {
int64_t Result = 0;
for (; *Buffer; ++Buffer) {
int64_t OldRes = Result;
Result *= 16;
char C = *Buffer;
if (C >= '0' && C <= '9')
Result += C-'0';
else if (C >= 'A' && C <= 'F')
Result += C-'A'+10;
else if (C >= 'a' && C <= 'f')
Result += C-'a'+10;
if (Result < OldRes) // Uh, oh, overflow detected!!!
StackerCompiler::ThrowException("constant bigger than 64 bits detected!");
}
return Result;
}
#define YY_NEVER_INTERACTIVE 1
%}
/* Comments start with a ; and go till end of line */
Comment1 [#].*$
/* You can also embed them in ( ... ) */
Comment2 \(.*\)
/* We ignore white space */
White [ \t\r\n]
/* jdentifiers start with a % sign */
Identifier [A-Za-z][-A-Za-z0-9_]*
/* Strings can contain any character except " and \ */
String \"[^\"]*\"
/* Positive and negative integer constants*/
PInteger [+]?[0-9]+
NInteger -[0-9]+
HexInteger 0x[0-9A-Fa-f]+
/* Special Characters - name them to avoid flex confusion */
Semi [;]
Colon [:]
Less \<
More \>
LessEq \<\=
MoreEq \>\=
NotEq \<\>
Equal \=
Plus \+
Minus \-
Incr \+\+
Decr \-\-
Mult \*
Div \/
StarSlash \*\/
LShift \<\<
RShift \>\>
InStr \<s
InNum \<d
InChar \<c
OutStr \>s
OutNum \>d
OutChar \>c
%%
{Comment1} { /* Ignore comments */ }
{Comment2} { /* Ignore comments */ }
{Colon} { return COLON; }
{Semi} { return SEMI; }
TRUE { return TRUETOK; }
FALSE { return FALSETOK; }
ON { return TRUETOK; }
OFF { return FALSETOK; }
{Less} { return LESS; }
LT { return LESS; }
{More} { return MORE; }
GT { return MORE; }
{LessEq} { return LESS_EQUAL; }
LE { return LESS_EQUAL; }
{MoreEq} { return MORE_EQUAL; }
GE { return MORE_EQUAL; }
{NotEq} { return NOT_EQUAL; }
NE { return NOT_EQUAL; }
{Equal} { return EQUAL; }
EQ { return EQUAL; }
{Plus} { return PLUS; }
{Minus} { return MINUS; }
{Incr} { return INCR; }
{Decr} { return DECR; }
{Mult} { return MULT; }
{Div} { return DIV; }
MOD { return MODULUS; }
NEG { return NEGATE; }
ABS { return ABS; }
MIN { return MIN; }
MAX { return MAX; }
{StarSlash} { return STAR_SLASH; }
AND { return AND; }
OR { return OR; }
XOR { return XOR; }
{LShift} { return LSHIFT; }
{RShift} { return RSHIFT; }
DROP { return DROP; }
NIP { return NIP; }
DUP { return DUP; }
SWAP { return SWAP; }
OVER { return OVER; }
PICK { return PICK; }
SELECT { return SELECT; }
ROT { return ROT; }
RROT { return RROT; }
ROLL { return ROLL; }
TUCK { return TUCK; }
DROP2 { return DROP2; }
NIP2 { return NIP2; }
DUP2 { return DUP2; }
SWAP2 { return SWAP2; }
OVER2 { return OVER2; }
TUCK2 { return TUCK2; }
ROT2 { return ROT2; }
RROT2 { return RROT2; }
MALLOC { return MALLOC; }
FREE { return FREE; }
GET { return GET; }
PUT { return PUT; }
IF { return IF; }
ELSE { return ELSE; }
ENDIF { return ENDIF; }
WHILE { return WHILE; }
END { return END; }
RECURSE { return RECURSE; }
RETURN { return RETURN; }
EXIT { return EXIT; }
FORWARD { return FORWARD; }
TAB { return TAB; }
SPACE { return SPACE; }
CR { return CR; }
{InStr} { return IN_STR; }
{InNum} { return IN_NUM; }
{InChar} { return IN_CHAR; }
{OutStr} { return OUT_STR; }
{OutNum} { return OUT_NUM; }
{OutChar} { return OUT_CHAR; }
MAIN { return MAIN; }
DUMP { return DUMP; }
!= { StackerCompiler::ThrowException(
"You probably meant to use a <> instead of !=" ); }
== { StackerCompiler::ThrowException(
"You probably meant to use a single = .. this isn't C"); }
{PInteger} { Stackerlval.IntegerVal = IntToVal(yytext); return INTEGER; }
{NInteger} { uint64_t Val = IntToVal(yytext+1);
// +1: we have bigger negative range
if (Val > (uint64_t)INT64_MAX+1)
StackerCompiler::ThrowException(
"Constant too large for signed 64 bits!");
Stackerlval.IntegerVal = -Val;
return INTEGER;
}
{HexInteger} { Stackerlval.IntegerVal = HexIntToVal(yytext+3);
return INTEGER;
}
{String} { yytext[strlen(yytext)-1] = 0; // nuke end quote
Stackerlval.StringVal = strdup(yytext+1); // Nuke start quote
return STRING;
}
{Identifier} { Stackerlval.StringVal = strdup(yytext); return IDENTIFIER; }
{White} { /* Ignore whitespace */ }
%%
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