📄 rgram.c
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/* @(#)rgram.c 1.3 96/07/24 *//* * ==================================================== * Copyright (C) 1995 by Sun Microsystems, Inc. All rights reserved. * * Developed at SunSoft, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this * software is freely granted, provided that this notice * is preserved. * ==================================================== */#include "fpp.h"#include "rgram.h"extern int f77fl; /* 1 - F77, 0 - F90 */extern int fixedformfl; /* 1 - fixed form, 0 - free form */typedef struct _node { int token; struct _node *next; struct _node *alt;} Node;static Node st0;/****************************** F77 reduced grammar **************************//* here we wait for a preprocessor directive */static Node stFPP = { TK_DUMMY, &st0, &st0 };/* ASSIGN lab TO ... possible name splitting */static Node stASGNex= { TK_DUMMY, &st0, &st0 };static Node stASGN = { TK_NUM, &stASGNex, &st0 };/* DO lab I= ... possible name splitting */static Node stDO = { TK_DUMMY, &st0, &st0 };/* READ(10'3) syntax exception */static Node stRDWRex= { TK_DUMMY, &st0, &st0 };static Node stRDWR2 = { TK_NAME, &stRDWRex, &st0}; /* READ(UNIT ... */static Node stRDWR1 = { TK_NUM, &stRDWRex, &stRDWR2}; /* READ(10 ... */static Node stRDWR = { TK_LPAR, &stRDWR1, &st0}; /* READ( ... *//* format exceptions of macro substitution */static Node stFMTex = { TK_DUMMY, &st0, &st0}; static Node stFMT = { TK_LPAR, &stFMTex, &st0}; /* FORMAT( ... *//* CHARACTER*8H12 mustn't produce hollerith constant */static Node stTYPEex1 = {TK_DUMMY, &st0, &st0};static Node stTYPEex = {TK_NUM, &stTYPEex1, &st0}; /* TYPE*8 ... */static Node stTYPE = {TK_STAR, &stTYPEex, &st0 }; /* TYPE* ... *//* being in stBOS means to be at the beginning of a statement */static Node st90IMPL;static Node st90IMPLa;static Node stBOS6 = {TK_DO, &stDO, &st0 };static Node stBOS5 = {TK_ASGN, &stASGN, &stBOS6 };static Node stBOS4 = {TK_RDWR, &stRDWR, &stBOS5 };static Node stBOS3 = {TK_IMPLICIT, &st90IMPL, &stBOS4 };static Node stBOS2 = {TK_FORMAT, &stFMT, &stBOS3 };static Node stBOS1 = {TK_TYPE, &stTYPE, &stBOS2 };static Node stBOS = {TK_KEY, &st0, &stBOS1 };/* being in stNL means to be at the beginning of a line */static Node stNL3 = { TK_BOS, &stBOS , &st0 };static Node stNL2 = { TK_NUM, &stNL3 , &stNL3 };static Node stNL1 = { TK_DUMMY, &stNL2, &st0 };static Node stNL = { TK_FPP, &stFPP, &stNL1 };/* here we wait only for newline & implicit tokens*/static Node st0_2 = { TK_IMPLICIT, &st90IMPL, 0 };static Node st0_1 = { TK_IMPLICIT1, &st90IMPLa, &st0_2 };static Node st0 = { TK_NL, &stNL, &st0_1 };/****************************** F90 fixed form reduced grammar ***************/static Node st90TYPEex1= {TK_DUMMY, &st0, &st0};static Node st90TYPEex = {TK_NUM, &stTYPEex1, &st0}; /* TYPE*8 ... */static Node st90TYPE3 = {TK_STAR, &stTYPEex, &st0 }; /* TYPE* ... */static Node st90TYPE2 = {TK_RPAR, &st90TYPEex1, &st0 };static Node st90TYPE1 = {TK_NAME, &st90TYPE2, &st0 };static Node st90TYPE = {TK_LPAR, &st90TYPE1, &st0 };static Node st90REC1 = {TK_TYPE, &st90TYPE3, &st0 };static Node st90REC = {TK_TYPE0, &st90TYPE, &st90REC1 };static Node stx90BOS8 = {TK_RECUR,&st90REC, &st0 };static Node stx90BOS7 = {TK_DO, &stDO, &stx90BOS8 };static Node stx90BOS6 = {TK_TYPE0,&st90TYPE, &stx90BOS7 };static Node stx90BOS5 = {TK_ASGN, &stASGN, &stx90BOS6 };static Node stx90BOS4 = {TK_RDWR, &stRDWR, &stx90BOS5 };static Node stx90BOS3 = {TK_IMPLICIT, &st90IMPL, &stx90BOS4 };static Node stx90BOS2 = {TK_FORMAT,&stFMT, &stx90BOS3 };static Node stx90BOS1 = {TK_TYPE, &st90TYPE3, &stx90BOS2 };static Node stx90BOS = {TK_KEY, &st0, &stx90BOS1 };static Node stx90NL3 = { TK_BOS, &stx90BOS , &st0 };static Node stx90NL2 = { TK_NUM, &stx90NL3 , &stx90NL3 };static Node stx90NL1 = { TK_DUMMY, &stx90NL2 , &st0 };static Node stx90NL = { TK_FPP, &stFPP, &stx90NL1 };static Node stx90_3= { TK_IMPLICIT, &st90IMPL, 0 };static Node stx90_2= { TK_IMPLICIT1, &st90IMPLa, &stx90_3 };static Node stx90_1= { TK_SCLN, &stx90BOS, &stx90_2 };static Node stx90 = { TK_NL, &stx90NL, &stx90_1 };/****************************** F90 free form reduced grammar ****************/static Node st90;static Node st90IMPLa;static Node st90IMPLa2 = { TK_MINUS, &st90IMPLa, &st0 };static Node st90IMPLa1 = { TK_COMMA, &st90IMPLa, &st90IMPLa2 };static Node st90IMPLa = { TK_NAME0, &st90IMPLa1, &st0 };static Node st90IMPLno = { TK_DUMMY, &st0, &st0 }; static Node st90IMPL3 = { TK_LPAR, &st90IMPLno, &st0 }; static Node st90IMPL2 = { TK_STAR, &st90IMPL3, &st0 };static Node st90IMPL1 = { TK_TYPE, &st90IMPL2, &st0 };static Node st90IMPL = { TK_TYPE0, &st90IMPL3, &st90IMPL1 };static Node st90BOS2= { TK_IMPLICIT, &st90IMPL, &st0 };static Node st90BOS1= { TK_FORMAT, &stFMT, &st90BOS2 };static Node st90BOS = { TK_NUM, &st90BOS1, &st90BOS1 };static Node st90NL1 = { TK_DUMMY, &st90BOS, &st0 };static Node st90NL = { TK_FPP, &stFPP, &st90NL1 };static Node st90_3= { TK_IMPLICIT, &st90IMPL, 0 };static Node st90_2= { TK_IMPLICIT1, &st90IMPLa, &st90_3 };static Node st90_1= { TK_SCLN, &st90BOS, &st90_2 };static Node st90 = { TK_NL, &st90NL, &st90_1 };static Node *curst = &st0;/**************************************************************** Functions **/voidst_init( int n ) { CHECK(n>=0 && n<=2); switch (n) { case 0: break; /* f77 fixed form */ case 1: st0 = stx90; /* f90 fixed form */ break; case 2: st0 = st90; /* f90 free form */ break; } st_move(TK_NL);}voidst_move( int tk) { if (tk == TK_SKIP) { curst = &st0; return; } for (;;) { if (curst->token == tk) { curst = curst->next; break; } if (!curst->alt) { curst = &st0; break; } curst = curst->alt; }}intst_is(int st) { if (f77fl) { switch (st) { case ST_FPP: if(curst == &stFPP) return 1; break; case ST_NL: if(curst == &stNL) return 1; break; case ST_BOS: if(curst == &stBOS) return 1; break; case ST_DO: if(curst == &stDO) return 1; break; case ST_ASSIGN: if(curst == &stASGN) return 1; break; case ST_ASSIGNUM: if(curst == &stASGNex) return 1; break; case ST_EXCEPT: if(curst == &stFMTex) return 1; break; case ST_TYPE: if(curst == &stTYPEex) return 1; break; case ST_TYPE1: if(curst == &stTYPE || curst == &stTYPEex1) return 1; break; case ST_RDWR: if(curst == &stRDWRex) return 1; break; case ST_IMPL: if (curst == &st90IMPLa) return 1; break; case ST_IMPL0: if (curst == &st90IMPL) return 1; break; case ST_NOIMPL: if (curst == &st90IMPLno) return 1; break; default: break; } return 0; } else if (fixedformfl) { switch (st) { case ST_FPP: if(curst == &stFPP) return 1; break; case ST_NL: if(curst == &stx90NL) return 1; break; case ST_BOS: if(curst == &stx90BOS || curst == &st90REC) return 1; break; case ST_DO: if(curst == &stDO) return 1; break; case ST_ASSIGN: if(curst == &stASGN) return 1; break; case ST_ASSIGNUM: if(curst == &stASGNex) return 1; break; case ST_EXCEPT: if(curst == &stFMTex) return 1; break; case ST_TYPE: if(curst == &stTYPEex) return 1; break; case ST_TYPE1: if(curst == &stTYPE || curst == &stTYPEex1) return 1; break; case ST_RDWR: if(curst == &stRDWRex) return 1; break; case ST_IMPL: if (curst == &st90IMPLa) return 1; break; case ST_IMPL0: if (curst == &st90IMPL) return 1; break; case ST_NOIMPL: if (curst == &st90IMPLno) return 1; break; default: break; } return 0; } else { switch (st) { case ST_FPP: if(curst == &stFPP) return 1; break; case ST_NL: if(curst == &st90NL) return 1; break; case ST_BOS: if(curst == &st90BOS || curst == &st90BOS1) return 1; break; case ST_EXCEPT: if(curst == &stFMTex) return 1; break; case ST_IMPL: if (curst == &st90IMPLa) return 1; break; case ST_IMPL0: if (curst == &st90IMPL) return 1; break; case ST_NOIMPL: if (curst == &st90IMPLno) return 1; break; default: break; } return 0; }}⌨️ 快捷键说明
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