import java.io.*; class Calc3Scanner { private final int YY_BUFFER_SIZE = 512; private final int YY_F = -1; private final int YY_NO_STATE = -1; private final int YY_NOT_ACCEPT = 0; private final int YY_START = 1; private final int YY_END = 2; private final int YY_NO_ANCHOR = 4; private final int YY_BOL = 128; private final int YY_EOF = 129; static Calc3Scanner foo; public static void init(InputStream is) { foo = new Calc3Scanner(is); } public static Symbol next_token() throws java.io.IOException { Symbol s= foo.yylex(); String prompt=""; if (s.value !=null && s.value instanceof String){ prompt=prompt+" "+ s.value; } System.out.print(prompt); return s; } private java.io.BufferedReader yy_reader; private int yy_buffer_index; private int yy_buffer_read; private int yy_buffer_start; private int yy_buffer_end; private char yy_buffer[]; private boolean yy_at_bol; private int yy_lexical_state; Calc3Scanner (java.io.Reader reader) { this (); if (null == reader) { throw (new Error("Error: Bad input stream initializer.")); } yy_reader = new java.io.BufferedReader(reader); } Calc3Scanner (java.io.InputStream instream) { this (); if (null == instream) { throw (new Error("Error: Bad input stream initializer.")); } yy_reader = new java.io.BufferedReader(new java.io.InputStreamReader(instream)); } private Calc3Scanner () { yy_buffer = new char[YY_BUFFER_SIZE]; yy_buffer_read = 0; yy_buffer_index = 0; yy_buffer_start = 0; yy_buffer_end = 0; yy_at_bol = true; yy_lexical_state = YYINITIAL; } private boolean yy_eof_done = false; private final int YYINITIAL = 0; private final int yy_state_dtrans[] = { 0 }; private void yybegin (int state) { yy_lexical_state = state; } private int yy_advance () throws java.io.IOException { int next_read; int i; int j; if (yy_buffer_index < yy_buffer_read) { return yy_buffer[yy_buffer_index++]; } if (0 != yy_buffer_start) { i = yy_buffer_start; j = 0; while (i < yy_buffer_read) { yy_buffer[j] = yy_buffer[i]; ++i; ++j; } yy_buffer_end = yy_buffer_end - yy_buffer_start; yy_buffer_start = 0; yy_buffer_read = j; yy_buffer_index = j; next_read = yy_reader.read(yy_buffer, yy_buffer_read, yy_buffer.length - yy_buffer_read); if (-1 == next_read) { return YY_EOF; } yy_buffer_read = yy_buffer_read + next_read; } while (yy_buffer_index >= yy_buffer_read) { if (yy_buffer_index >= yy_buffer.length) { yy_buffer = yy_double(yy_buffer); } next_read = yy_reader.read(yy_buffer, yy_buffer_read, yy_buffer.length - yy_buffer_read); if (-1 == next_read) { return YY_EOF; } yy_buffer_read = yy_buffer_read + next_read; } return yy_buffer[yy_buffer_index++]; } private void yy_move_end () { if (yy_buffer_end > yy_buffer_start && '\n' == yy_buffer[yy_buffer_end-1]) yy_buffer_end--; if (yy_buffer_end > yy_buffer_start && '\r' == yy_buffer[yy_buffer_end-1]) yy_buffer_end--; } private boolean yy_last_was_cr=false; private void yy_mark_start () { yy_buffer_start = yy_buffer_index; } private void yy_mark_end () { yy_buffer_end = yy_buffer_index; } private void yy_to_mark () { yy_buffer_index = yy_buffer_end; yy_at_bol = (yy_buffer_end > yy_buffer_start) && ('\r' == yy_buffer[yy_buffer_end-1] || '\n' == yy_buffer[yy_buffer_end-1] || 2028/*LS*/ == yy_buffer[yy_buffer_end-1] || 2029/*PS*/ == yy_buffer[yy_buffer_end-1]); } private java.lang.String yytext () { return (new java.lang.String(yy_buffer, yy_buffer_start, yy_buffer_end - yy_buffer_start)); } private int yylength () { return yy_buffer_end - yy_buffer_start; } private char[] yy_double (char buf[]) { int i; char newbuf[]; newbuf = new char[2*buf.length]; for (i = 0; i < buf.length; ++i) { newbuf[i] = buf[i]; } return newbuf; } private final int YY_E_INTERNAL = 0; private final int YY_E_MATCH = 1; private java.lang.String yy_error_string[] = { "Error: Internal error.\n", "Error: Unmatched input.\n" }; private void yy_error (int code,boolean fatal) { java.lang.System.out.print(yy_error_string[code]); java.lang.System.out.flush(); if (fatal) { throw new Error("Fatal Error.\n"); } } private int[][] unpackFromString(int size1, int size2, String st) { int colonIndex = -1; String lengthString; int sequenceLength = 0; int sequenceInteger = 0; int commaIndex; String workString; int res[][] = new int[size1][size2]; for (int i= 0; i < size1; i++) { for (int j= 0; j < size2; j++) { if (sequenceLength != 0) { res[i][j] = sequenceInteger; sequenceLength--; continue; } commaIndex = st.indexOf(','); workString = (commaIndex==-1) ? st : st.substring(0, commaIndex); st = st.substring(commaIndex+1); colonIndex = workString.indexOf(':'); if (colonIndex == -1) { res[i][j]=Integer.parseInt(workString); continue; } lengthString = workString.substring(colonIndex+1); sequenceLength=Integer.parseInt(lengthString); workString=workString.substring(0,colonIndex); sequenceInteger=Integer.parseInt(workString); res[i][j] = sequenceInteger; sequenceLength--; } } return res; } private int yy_acpt[] = { /* 0 */ YY_NOT_ACCEPT, /* 1 */ YY_NO_ANCHOR, /* 2 */ YY_NO_ANCHOR, /* 3 */ YY_NO_ANCHOR, /* 4 */ YY_NO_ANCHOR, /* 5 */ YY_NO_ANCHOR, /* 6 */ YY_NO_ANCHOR, /* 7 */ YY_NO_ANCHOR, /* 8 */ YY_NO_ANCHOR, /* 9 */ YY_NO_ANCHOR, /* 10 */ YY_NO_ANCHOR, /* 11 */ YY_NO_ANCHOR }; private int yy_cmap[] = unpackFromString(1,130, "11:10,10,11:2,0,11:26,5,6,2,1,11:4,8:10,11,4,11,3,11:3,9:26,7:4,9,7,9:26,11" + ":5,12:2")[0]; private int yy_rmap[] = unpackFromString(1,12, "0,1:6,2,3,1:3")[0]; private int yy_nxt[][] = unpackFromString(4,13, "-1,1,2,3,4,5,6,7,8,7,9,10,11,-1:21,7:2,-1:11,8,-1:4"); public Symbol yylex () throws java.io.IOException { int yy_lookahead; int yy_anchor = YY_NO_ANCHOR; int yy_state = yy_state_dtrans[yy_lexical_state]; int yy_next_state = YY_NO_STATE; int yy_last_accept_state = YY_NO_STATE; boolean yy_initial = true; int yy_this_accept; yy_mark_start(); yy_this_accept = yy_acpt[yy_state]; if (YY_NOT_ACCEPT != yy_this_accept) { yy_last_accept_state = yy_state; yy_mark_end(); } while (true) { if (yy_initial && yy_at_bol) yy_lookahead = YY_BOL; else yy_lookahead = yy_advance(); yy_next_state = YY_F; yy_next_state = yy_nxt[yy_rmap[yy_state]][yy_cmap[yy_lookahead]]; if (YY_EOF == yy_lookahead && true == yy_initial) { return new Symbol(Calc2Symbol.EOF); } if (YY_F != yy_next_state) { yy_state = yy_next_state; yy_initial = false; yy_this_accept = yy_acpt[yy_state]; if (YY_NOT_ACCEPT != yy_this_accept) { yy_last_accept_state = yy_state; yy_mark_end(); } } else { if (YY_NO_STATE == yy_last_accept_state) { throw (new Error("Lexical Error: Unmatched Input.")); } else { yy_anchor = yy_acpt[yy_last_accept_state]; if (0 != (YY_END & yy_anchor)) { yy_move_end(); } yy_to_mark(); switch (yy_last_accept_state) { case 1: { return new Symbol(Calc2Symbol.PLUS, yytext()); } case -2: break; case 2: { return new Symbol(Calc2Symbol.MULTI, yytext()); } case -3: break; case 3: { return new Symbol(Calc2Symbol.EQUAL, yytext()); } case -4: break; case 4: { return new Symbol(Calc2Symbol.SEMI, yytext()); } case -5: break; case 5: { return new Symbol(Calc2Symbol.LPAREN, yytext()); } case -6: break; case 6: { return new Symbol(Calc2Symbol.RPAREN, yytext()); } case -7: break; case 7: {return new Symbol(Calc2Symbol.ID, yytext()); } case -8: break; case 8: { return new Symbol(Calc2Symbol.NUMBER, new Integer(yytext()));} case -9: break; case 9: {System.out.println("newline" + yytext()); } case -10: break; case 10: {System.out.println("illegal input" + yytext()); } case -11: break; case 11: case -12: break; default: yy_error(YY_E_INTERNAL,false); case -1: } yy_initial = true; yy_state = yy_state_dtrans[yy_lexical_state]; yy_next_state = YY_NO_STATE; yy_last_accept_state = YY_NO_STATE; yy_mark_start(); yy_this_accept = yy_acpt[yy_state]; if (YY_NOT_ACCEPT != yy_this_accept) { yy_last_accept_state = yy_state; yy_mark_end(); } } } } } }