lex.yy.c

一个面向对像语言的编译器

 */
#line 8 "scanner.l"

#include "scanner.h"
#include "utility.h" // for PrintDebug()
#include "errors.h"
#include <string.h>
#include "parser.h"

#define TAB_SIZE 8

/* Global variables
 * ----------------
 * (For shame!) But we need a few to keep track of things that are
 * preserved between calls to yylex or used outside the scanner.
 */
static int curLineNum, curColNum;
static char curLine[512];

static void DoBeforeEachAction(); 
#define YY_USER_ACTION DoBeforeEachAction();

/* States
 * ------
 * Our strategy for handling nested comments uses two lex states (N & C)
 * N = Normal (not inside a comment, we start in this state)
 * C = Comment (currently inside a comment)
 * Both are inclusive states (i.e. apply when explicitly named or none named)
 * Most rules will trigger when in normal mode, e.g. processing keywords
 * and identifiers only happens outside a comment. A few rules apply
 * when inside a comment (end-comment, EOF), and a few rules are used
 * in both states (ignoring whitespace, counting newlines, starting
 * another comment).  To track nesting depth, we turn on the stack option
 * so we can use lex's state stack. Each time we find a comment start,
 * we push a comment state, each time we find an end-comment, we pop.
 * Eventually this will return to the normal state in which we started.
 * (We could have also have tracked this with our own integer counter).
 * Another little wrinkle on states is the COPY exclusive state which
 * I added to first match each line and copy it to a saved buffer
 * before re-processing it. This allows us to print the entire line
 * to provide context on errors.
 */
#define YY_STACK_USED 1
#define N 1
#define C 2

#define COPY 3

/* Definitions
 * -----------
 * To make our rules more readable, we establish some definitions here.
 */
#line 547 "lex.yy.c"

/* Macros after this point can all be overridden by user definitions in
 * section 1.
 */

#ifndef YY_SKIP_YYWRAP
#ifdef __cplusplus
extern "C" int yywrap YY_PROTO(( void ));
#else
extern int yywrap YY_PROTO(( void ));
#endif
#endif

#ifndef YY_NO_UNPUT
static void yyunput YY_PROTO(( int c, char *buf_ptr ));
#endif

#ifndef yytext_ptr
static void yy_flex_strncpy YY_PROTO(( char *, yyconst char *, int ));
#endif

#ifndef YY_NO_INPUT
#ifdef __cplusplus
static int yyinput YY_PROTO(( void ));
#else
static int input YY_PROTO(( void ));
#endif
#endif

#if YY_STACK_USED
static int yy_start_stack_ptr = 0;
static int yy_start_stack_depth = 0;
static int *yy_start_stack = 0;
#ifndef YY_NO_PUSH_STATE
static void yy_push_state YY_PROTO(( int new_state ));
#endif
#ifndef YY_NO_POP_STATE
static void yy_pop_state YY_PROTO(( void ));
#endif
#ifndef YY_NO_TOP_STATE
static int yy_top_state YY_PROTO(( void ));
#endif

#else
#define YY_NO_PUSH_STATE 1
#define YY_NO_POP_STATE 1
#define YY_NO_TOP_STATE 1
#endif

#ifdef YY_MALLOC_DECL
YY_MALLOC_DECL
#else
#if __STDC__
#ifndef __cplusplus
#include <stdlib.h>
#endif
#else
/* Just try to get by without declaring the routines.  This will fail
 * miserably on non-ANSI systems for which sizeof(size_t) != sizeof(int)
 * or sizeof(void*) != sizeof(int).
 */
#endif
#endif

/* Amount of stuff to slurp up with each read. */
#ifndef YY_READ_BUF_SIZE
#define YY_READ_BUF_SIZE 8192
#endif

/* Copy whatever the last rule matched to the standard output. */

#ifndef ECHO
/* This used to be an fputs(), but since the string might contain NUL's,
 * we now use fwrite().
 */
#define ECHO (void) fwrite( yytext, yyleng, 1, yyout )
#endif

/* Gets input and stuffs it into "buf".  number of characters read, or YY_NULL,
 * is returned in "result".
 */
#ifndef YY_INPUT
#define YY_INPUT(buf,result,max_size) \
	if ( yy_current_buffer->yy_is_interactive ) \
		{ \
		int c = '*', n; \
		for ( n = 0; n < max_size && \
			     (c = getc( yyin )) != EOF && c != '\n'; ++n ) \
			buf[n] = (char) c; \
		if ( c == '\n' ) \
			buf[n++] = (char) c; \
		if ( c == EOF && ferror( yyin ) ) \
			YY_FATAL_ERROR( "input in flex scanner failed" ); \
		result = n; \
		} \
	else if ( ((result = fread( buf, 1, max_size, yyin )) == 0) \
		  && ferror( yyin ) ) \
		YY_FATAL_ERROR( "input in flex scanner failed" );
#endif

/* No semi-colon after return; correct usage is to write "yyterminate();" -
 * we don't want an extra ';' after the "return" because that will cause
 * some compilers to complain about unreachable statements.
 */
#ifndef yyterminate
#define yyterminate() return YY_NULL
#endif

/* Number of entries by which start-condition stack grows. */
#ifndef YY_START_STACK_INCR
#define YY_START_STACK_INCR 25
#endif

/* Report a fatal error. */
#ifndef YY_FATAL_ERROR
#define YY_FATAL_ERROR(msg) yy_fatal_error( msg )
#endif

/* Default declaration of generated scanner - a define so the user can
 * easily add parameters.
 */
#ifndef YY_DECL
#define YY_DECL int yylex YY_PROTO(( void ))
#endif

/* Code executed at the beginning of each rule, after yytext and yyleng
 * have been set up.
 */
#ifndef YY_USER_ACTION
#define YY_USER_ACTION
#endif

/* Code executed at the end of each rule. */
#ifndef YY_BREAK
#define YY_BREAK break;
#endif

#define YY_RULE_SETUP \
	YY_USER_ACTION

YY_DECL
	{
	register yy_state_type yy_current_state;
	register char *yy_cp, *yy_bp;
	register int yy_act;

#line 72 "scanner.l"


#line 697 "lex.yy.c"

	if ( yy_init )
		{
		yy_init = 0;

#ifdef YY_USER_INIT
		YY_USER_INIT;
#endif

		if ( ! yy_start )
			yy_start = 1;	/* first start state */

		if ( ! yyin )
			yyin = stdin;

		if ( ! yyout )
			yyout = stdout;

		if ( ! yy_current_buffer )
			yy_current_buffer =
				yy_create_buffer( yyin, YY_BUF_SIZE );

		yy_load_buffer_state();
		}

	while ( 1 )		/* loops until end-of-file is reached */
		{
		yy_cp = yy_c_buf_p;

		/* Support of yytext. */
		*yy_cp = yy_hold_char;

		/* yy_bp points to the position in yy_ch_buf of the start of
		 * the current run.
		 */
		yy_bp = yy_cp;

		yy_current_state = yy_start;
yy_match:
		do
			{
			register YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*yy_cp)];
			if ( yy_accept[yy_current_state] )
				{
				yy_last_accepting_state = yy_current_state;
				yy_last_accepting_cpos = yy_cp;
				}
			while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
				{
				yy_current_state = (int) yy_def[yy_current_state];
				if ( yy_current_state >= 161 )
					yy_c = yy_meta[(unsigned int) yy_c];
				}
			yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
			++yy_cp;
			}
		while ( yy_base[yy_current_state] != 238 );

yy_find_action:
		yy_act = yy_accept[yy_current_state];
		if ( yy_act == 0 )
			{ /* have to back up */
			yy_cp = yy_last_accepting_cpos;
			yy_current_state = yy_last_accepting_state;
			yy_act = yy_accept[yy_current_state];
			}

		YY_DO_BEFORE_ACTION;


do_action:	/* This label is used only to access EOF actions. */

		if ( yy_flex_debug )
			{
			if ( yy_act == 0 )
				fprintf( stderr, "--scanner backing up\n" );
			else if ( yy_act < 45 )
				fprintf( stderr, "--accepting rule at line %d (\"%s\")\n",
				         yy_rule_linenum[yy_act], yytext );
			else if ( yy_act == 45 )
				fprintf( stderr, "--accepting default rule (\"%s\")\n",
				         yytext );
			else if ( yy_act == 46 )
				fprintf( stderr, "--(end of buffer or a NUL)\n" );
			else
				fprintf( stderr, "--EOF (start condition %d)\n", YY_START );
			}

		switch ( yy_act )
	{ /* beginning of action switch */
			case 0: /* must back up */
			/* undo the effects of YY_DO_BEFORE_ACTION */
			*yy_cp = yy_hold_char;
			yy_cp = yy_last_accepting_cpos;
			yy_current_state = yy_last_accepting_state;
			goto yy_find_action;

case 1:
YY_RULE_SETUP
#line 74 "scanner.l"
{ strncpy(curLine, yytext, sizeof(curLine));
                         curColNum = 1;
                         yy_pop_state(); yyless(0); }
	YY_BREAK
case YY_STATE_EOF(COPY):
#line 77 "scanner.l"
{ yy_pop_state();}
	YY_BREAK
case 2:
YY_RULE_SETUP
#line 78 "scanner.l"
{ curLineNum++; curColNum = 1;
                         if (YYSTATE != COPY) yy_push_state(COPY); }
	YY_BREAK
case 3:
YY_RULE_SETUP
#line 81 "scanner.l"
{ /* ignore all spaces in normal or comment */  }
	YY_BREAK
case 4:
YY_RULE_SETUP
#line 82 "scanner.l"
{ curColNum += TAB_SIZE - curColNum%TAB_SIZE + 1; }
	YY_BREAK
/* -------------------- Comments ----------------------------- */
case 5:
YY_RULE_SETUP
#line 88 "scanner.l"
{ yy_push_state(C); }
	YY_BREAK
case 6:
YY_RULE_SETUP
#line 89 "scanner.l"
{ yy_pop_state(); }
	YY_BREAK
case YY_STATE_EOF(C):
#line 90 "scanner.l"
{ ReportError(&yylloc, err_unterm_comment);
                         return 0; }
	YY_BREAK
case 7:
YY_RULE_SETUP
#line 92 "scanner.l"
{ /* grab all non-star, non-slash, non-newline */}
	YY_BREAK
case 8:
YY_RULE_SETUP
#line 93 "scanner.l"
{ /* ignore everything else that doesn't match */ }
	YY_BREAK
case 9:
YY_RULE_SETUP
#line 94 "scanner.l"
{ /* skip to end of line for // comment */ } 
	YY_BREAK
/* --------------------- Keywords ------------------------------- */
case 10:
YY_RULE_SETUP
#line 98 "scanner.l"
{ return T_Void;        }
	YY_BREAK
case 11:
YY_RULE_SETUP
#line 99 "scanner.l"
{ return T_Int;         }
	YY_BREAK
case 12:
YY_RULE_SETUP
#line 100 "scanner.l"
{ return T_Double;      }
	YY_BREAK
case 13:
YY_RULE_SETUP
#line 101 "scanner.l"
{ return T_Bool;        }
	YY_BREAK
case 14:
YY_RULE_SETUP
#line 102 "scanner.l"
{ return T_String;      }
	YY_BREAK
case 15:
YY_RULE_SETUP
#line 103 "scanner.l"
{ return T_Null;        }
	YY_BREAK
case 16:
YY_RULE_SETUP
#line 104 "scanner.l"
{ return T_Class;       }
	YY_BREAK
case 17:
YY_RULE_SETUP
#line 105 "scanner.l"
{ return T_Extends;     }
	YY_BREAK
case 18:
YY_RULE_SETUP
#line 106 "scanner.l"
{ return T_This;        }
	YY_BREAK
case 19:
YY_RULE_SETUP
#line 107 "scanner.l"
{ return T_While;       }
	YY_BREAK
case 20:
YY_RULE_SETUP
#line 108 "scanner.l"
{ return T_For;         }
	YY_BREAK
case 21:
YY_RULE_SETUP
#line 109 "scanner.l"
{ return T_If;          }
	YY_BREAK
case 22:
YY_RULE_SETUP
#line 110 "scanner.l"
{ return T_Else;        }
	YY_BREAK
case 23:
YY_RULE_SETUP
#line 111 "scanner.l"
{ return T_Return;      }
	YY_BREAK
case 24:
YY_RULE_SETUP
#line 112 "scanner.l"
{ return T_Break;       }
	YY_BREAK
case 25:
YY_RULE_SETUP
#line 113 "scanner.l"
{ return T_New;         }
	YY_BREAK
case 26:
YY_RULE_SETUP
#line 114 "scanner.l"
{ return T_NewArray;    }
	YY_BREAK
case 27:
YY_RULE_SETUP
#line 115 "scanner.l"
{ return T_Print;       }
	YY_BREAK
case 28:
YY_RULE_SETUP
#line 116 "scanner.l"
{ return T_ReadInteger; }
	YY_BREAK
case 29:
YY_RULE_SETUP
#line 117 "scanner.l"
{ return T_ReadLine;    }
	YY_BREAK
/* -------------------- Operators ----------------------------- */
case 30:
YY_RULE_SETUP
#line 122 "scanner.l"
{ return T_LessEqual;   }
	YY_BREAK
case 31:
YY_RULE_SETUP
#line 123 "scanner.l"
{ return T_GreaterEqual;}
	YY_BREAK
case 32:
YY_RULE_SETUP
#line 124 "scanner.l"
{ return T_Equal;       }
	YY_BREAK
case 33:
YY_RULE_SETUP
#line 125 "scanner.l"
{ return T_NotEqual;    }
	YY_BREAK
case 34:
YY_RULE_SETUP
#line 126 "scanner.l"
{ return T_And;         }
	YY_BREAK
case 35:
YY_RULE_SETUP
#line 127 "scanner.l"
{ return T_Or;          }
	YY_BREAK
case 36:
YY_RULE_SETUP
#line 128 "scanner.l"