1 | /* -*-c++-*- */ |
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2 | /**************************************** |
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3 | * Computer Algebra System SINGULAR * |
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4 | ****************************************/ |
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5 | /* $Id: febase.inc,v 1.33 2001-08-27 14:46:58 Singular Exp $ */ |
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6 | /* |
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7 | * ABSTRACT: handling of 'voices' |
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8 | */ |
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9 | #include <ctype.h> |
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10 | #include "sdb.h" |
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11 | |
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12 | extern int blocknest; /* scaner.l internal */ |
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13 | |
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14 | int yy_noeof=0; // the scanner "state" |
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15 | int yy_blocklineno; // to get the lineno of the block start from scanner |
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16 | Voice *currentVoice = NULL; |
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17 | FILE *feFilePending; /*temp. storage for grammar.y */ |
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18 | |
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19 | static char * BT_name[]={"BT_none","BT_break","BT_proc","BT_example", |
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20 | "BT_file","BT_execute","BT_if","BT_else"}; |
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21 | /*2 |
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22 | * the name of the current 'Voice': the procname (or filename) |
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23 | */ |
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24 | const char * VoiceName() |
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25 | { |
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26 | if ((currentVoice!=NULL) |
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27 | && (currentVoice->filename!=NULL)) |
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28 | return currentVoice->filename; |
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29 | return sNoName; |
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30 | } |
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31 | |
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32 | /*2 |
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33 | * the calling chain of Voices |
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34 | */ |
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35 | void VoiceBackTrack() |
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36 | { |
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37 | Voice *p=currentVoice; |
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38 | while (p->prev!=NULL) |
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39 | { |
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40 | p=p->prev; |
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41 | char *s=p->filename; |
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42 | if (s==NULL) |
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43 | PrintS("-- called from ? --\n"); |
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44 | else |
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45 | Print("-- called from %s --\n",s); |
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46 | } |
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47 | } |
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48 | |
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49 | /*2 |
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50 | * init a new voice similiar to the current |
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51 | */ |
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52 | void Voice::Next() |
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53 | { |
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54 | Voice *p=new Voice; |
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55 | // OB: ??? |
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56 | // Hmm... when Singular is used as batch file |
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57 | // then this voice is never freed |
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58 | omMarkAsStaticAddr(p); |
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59 | if (currentVoice != NULL) |
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60 | { |
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61 | currentVoice->curr_lineno=yylineno; |
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62 | currentVoice->next=p; |
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63 | } |
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64 | p->prev=currentVoice; |
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65 | currentVoice=p; |
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66 | //Print("Next:"); |
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67 | } |
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68 | |
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69 | feBufferTypes Voice::Typ() |
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70 | { |
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71 | switch(typ) |
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72 | { |
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73 | case BT_proc: |
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74 | case BT_example: |
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75 | case BT_file: |
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76 | return typ; |
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77 | default: |
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78 | if (prev==NULL) return (feBufferTypes)0; |
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79 | return prev->Typ(); |
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80 | } |
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81 | } |
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82 | |
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83 | /*2 |
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84 | * start the file 'fname' (STDIN is stdin) as a new voice (cf.VFile) |
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85 | * return FALSE on success, TRUE if an error occurs (file cannot be opened) |
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86 | */ |
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87 | BOOLEAN newFile(char *fname,FILE* f) |
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88 | { |
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89 | currentVoice->Next(); |
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90 | //Print(":File%d(%s):%s(%x)\n", |
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91 | // currentVoice->typ,BT_name[currentVoice->typ],fname,currentVoice); |
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92 | currentVoice->filename = omStrDup(fname); |
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93 | omMarkAsStaticAddr(currentVoice->filename); |
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94 | if (strcmp(fname,"STDIN") == 0) |
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95 | { |
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96 | currentVoice->files = stdin; |
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97 | currentVoice->sw = BI_stdin; |
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98 | currentVoice->start_lineno = 1; |
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99 | } |
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100 | else |
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101 | { |
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102 | currentVoice->sw = BI_file; /* needed by exitVoice below */ |
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103 | if (f!=NULL) |
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104 | currentVoice->files = f; |
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105 | else |
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106 | { |
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107 | currentVoice->files = feFopen(fname,"r",NULL,TRUE); |
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108 | if (currentVoice->files==NULL) |
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109 | { |
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110 | exitVoice(); |
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111 | return TRUE; |
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112 | } |
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113 | } |
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114 | currentVoice->start_lineno = 0; |
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115 | } |
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116 | yylineno=currentVoice->start_lineno; |
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117 | //Voice *p=currentVoice; |
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118 | //Print("-----------------\ncurr:"); |
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119 | //do |
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120 | //{ |
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121 | //Print("voice fn:%s\n",p->filename); |
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122 | //p=p->prev; |
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123 | //} |
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124 | //while (p!=NULL); |
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125 | //Print("----------------\n"); |
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126 | return FALSE; |
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127 | } |
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128 | |
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129 | void newBuffer(char* s, feBufferTypes t, procinfo* pi, int lineno) |
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130 | { |
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131 | currentVoice->Next(); |
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132 | //Print(":Buffer%d(%s):%s(%x)\n", |
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133 | // t,BT_name[t],pname,currentVoice); |
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134 | if (pi!=NULL) |
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135 | { |
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136 | int l=strlen(pi->procname); |
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137 | if (pi->libname!=NULL) l+=strlen(pi->libname); |
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138 | currentVoice->filename = (char *)omAlloc(l+3); |
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139 | *currentVoice->filename='\0'; |
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140 | if (pi->libname!=NULL) strcat(currentVoice->filename,pi->libname); |
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141 | strcat(currentVoice->filename,"::"); |
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142 | strcat(currentVoice->filename,pi->procname); |
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143 | currentVoice->pi = pi; |
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144 | } |
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145 | else |
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146 | { |
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147 | currentVoice->filename = omStrDup(currentVoice->prev->filename); |
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148 | currentVoice->pi = currentVoice->prev->pi; |
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149 | } |
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150 | currentVoice->buffer = s; |
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151 | currentVoice->sw = BI_buffer; |
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152 | currentVoice->typ = t; |
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153 | switch (t) |
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154 | { |
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155 | case BT_execute: |
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156 | yylineno-=2; |
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157 | break; |
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158 | case BT_proc: |
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159 | case BT_example: |
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160 | currentVoice->oldb=myynewbuffer(); |
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161 | yylineno = lineno+1; |
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162 | break; |
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163 | case BT_if: |
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164 | case BT_else: |
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165 | case BT_break: |
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166 | yylineno = yy_blocklineno-1; |
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167 | break; |
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168 | //case BT_file: |
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169 | default: |
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170 | yylineno = 1; |
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171 | break; |
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172 | } |
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173 | //Print("start body (%s) at line %d\n",BT_name[t],yylineno); |
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174 | currentVoice->start_lineno = yylineno; |
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175 | //printf("start buffer typ %d\n",t); |
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176 | //Voice *p=currentVoice; |
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177 | //Print("-----------------\ncurr:"); |
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178 | //do |
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179 | //{ |
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180 | //Print("voice fn:%s\n",p->filename); |
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181 | //p=p->prev; |
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182 | //} |
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183 | //while (p!=NULL); |
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184 | //Print("----------------\n"); |
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185 | } |
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186 | |
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187 | /*2 |
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188 | * exit Buffer of type 'typ': |
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189 | * returns 1 if buffer type could not be found |
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190 | */ |
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191 | BOOLEAN exitBuffer(feBufferTypes typ) |
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192 | { |
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193 | //printf("exitBuffer: %d(%s),(%x)\n", |
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194 | // typ,BT_name[typ], currentVoice); |
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195 | //Voice *p=currentVoice; |
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196 | //Print("-----------------\ncurr:"); |
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197 | //do |
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198 | //{ |
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199 | //Print("voice fn:%s\n",p->filename); |
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200 | //p=p->prev; |
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201 | //} |
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202 | //while (p!=NULL); |
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203 | //Print("----------------\n"); |
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204 | if (typ == BT_break) // valid inside for, while. may skip if, else |
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205 | { |
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206 | /*4 first check for valid buffer type, skip if/else*/ |
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207 | Voice *p=currentVoice; |
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208 | loop |
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209 | { |
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210 | if ((p->typ != BT_if) |
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211 | &&(p->typ != BT_else)) |
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212 | { |
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213 | if (p->typ == BT_break /*typ*/) |
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214 | { |
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215 | while (p != currentVoice) |
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216 | { |
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217 | exitVoice(); |
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218 | } |
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219 | exitVoice(); |
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220 | return FALSE; |
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221 | } |
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222 | else return TRUE; |
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223 | } |
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224 | if (p->prev==NULL) break; |
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225 | p=p->prev; |
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226 | } |
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227 | /*4 break not inside a for/while: return an error*/ |
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228 | if (/*typ*/ BT_break != currentVoice->typ) return 1; |
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229 | return exitVoice(); |
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230 | } |
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231 | |
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232 | if ((typ == BT_proc) |
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233 | || (typ == BT_example)) |
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234 | { |
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235 | Voice *p=currentVoice; |
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236 | loop |
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237 | { |
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238 | if ((p->typ == BT_proc) |
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239 | || (p->typ == BT_example)) |
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240 | { |
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241 | while (p != currentVoice) |
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242 | { |
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243 | exitVoice(); |
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244 | } |
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245 | exitVoice(); |
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246 | return FALSE; |
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247 | } |
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248 | if (p->prev==NULL) break; |
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249 | p=p->prev; |
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250 | } |
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251 | } |
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252 | /*4 return not inside a proc: return an error*/ |
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253 | return TRUE; |
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254 | } |
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255 | |
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256 | /*2 |
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257 | * jump to the beginning of a buffer |
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258 | */ |
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259 | BOOLEAN contBuffer(feBufferTypes typ) |
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260 | { |
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261 | //printf("contBuffer: %d(%s),(%x)\n", |
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262 | // typ,BT_name[typ], currentVoice); |
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263 | if (typ == BT_break) // valid inside for, while. may skip if, else |
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264 | { |
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265 | // first check for valid buffer type |
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266 | Voice *p=currentVoice; |
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267 | loop |
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268 | { |
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269 | if ((p->typ != BT_if) |
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270 | &&(p->typ != BT_else)) |
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271 | { |
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272 | if (p->typ == BT_break /*typ*/) |
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273 | { |
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274 | while (p != currentVoice) |
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275 | { |
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276 | exitVoice(); |
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277 | } |
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278 | yylineno = currentVoice->start_lineno; |
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279 | currentVoice->fptr=0; |
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280 | return FALSE; |
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281 | } |
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282 | else return TRUE; |
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283 | } |
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284 | if (p->prev==NULL) break; |
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285 | p=p->prev; |
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286 | } |
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287 | } |
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288 | return TRUE; |
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289 | } |
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290 | |
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291 | /*2 |
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292 | * leave a voice: kill local variables |
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293 | * setup everything from the previous level |
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294 | * return 1 if leaving the top level, 0 otherwise |
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295 | */ |
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296 | BOOLEAN exitVoice() |
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297 | { |
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298 | //printf("exitVoice: %d(%s),(%x)\n", |
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299 | // currentVoice->typ,BT_name[currentVoice->typ], currentVoice); |
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300 | //{ |
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301 | //Voice *p=currentVoice; |
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302 | //Print("-----------------\ncurr:"); |
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303 | //do |
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304 | //{ |
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305 | //Print("voice fn:%s\n",p->filename); |
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306 | //p=p->prev; |
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307 | //} |
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308 | //while (p!=NULL); |
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309 | //Print("----------------\n"); |
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310 | //} |
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311 | if (currentVoice!=NULL) |
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312 | { |
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313 | if (currentVoice->oldb!=NULL) |
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314 | { |
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315 | myyoldbuffer(currentVoice->oldb); |
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316 | currentVoice->oldb=NULL; |
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317 | } |
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318 | if ((currentVoice->prev==NULL)&&(currentVoice->sw==BI_file)) |
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319 | { |
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320 | currentVoice->prev=feInitStdin(); |
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321 | } |
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322 | if (currentVoice->prev!=NULL) |
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323 | { |
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324 | //printf("exitVoice typ %d(%s)\n", |
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325 | // currentVoice->typ,BT_name[currentVoice->typ]); |
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326 | if (currentVoice->typ==BT_if) |
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327 | { |
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328 | currentVoice->prev->ifsw=2; |
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329 | } |
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330 | else |
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331 | { |
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332 | currentVoice->prev->ifsw=0; |
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333 | } |
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334 | if ((currentVoice->sw == BI_file) |
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335 | && (currentVoice->files!=NULL)) |
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336 | { |
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337 | fclose(currentVoice->files); |
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338 | } |
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339 | if (currentVoice->filename!=NULL) |
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340 | { |
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341 | omFree((ADDRESS)currentVoice->filename); |
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342 | currentVoice->filename=NULL; |
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343 | } |
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344 | if (currentVoice->buffer!=NULL) |
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345 | { |
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346 | omFree((ADDRESS)currentVoice->buffer); |
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347 | currentVoice->buffer=NULL; |
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348 | } |
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349 | yylineno=currentVoice->prev->curr_lineno; |
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350 | currentVoice->prev->next=NULL; |
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351 | } |
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352 | Voice *p=currentVoice->prev; |
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353 | delete currentVoice; |
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354 | currentVoice=p; |
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355 | } |
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356 | return currentVoice==NULL; |
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357 | } |
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358 | |
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359 | /*2 |
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360 | * set prompt_char |
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361 | * only called with currentVoice->sw == BI_stdin |
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362 | */ |
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363 | static void feShowPrompt(void) |
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364 | { |
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365 | fe_promptstr[0]=prompt_char; |
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366 | #ifdef macintosh |
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367 | cols = 0; |
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368 | printf(fe_promptstr);mflush(); |
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369 | #endif |
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370 | } |
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371 | |
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372 | /*2 |
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373 | * print echo (si_echo or TRACE), set my_yylinebuf |
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374 | */ |
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375 | static int fePrintEcho(char *anf, char *b) |
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376 | { |
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377 | char *ss=strrchr(anf,'\n'); |
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378 | int len_s; |
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379 | if (ss==NULL) |
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380 | { |
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381 | len_s=strlen(anf); |
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382 | } |
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383 | else |
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384 | { |
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385 | len_s=ss-anf+1; |
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386 | } |
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387 | // my_yylinebuf: |
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388 | int mrc=min(len_s,79)-1; |
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389 | strcpy(my_yylinebuf,anf+(len_s-1)-mrc); |
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390 | if (my_yylinebuf[mrc] == '\n') my_yylinebuf[mrc] = '\0'; |
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391 | mrc--; |
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392 | // handle echo: |
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393 | if (((si_echo>myynest) |
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394 | && ((currentVoice->typ==BT_proc) |
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395 | || (currentVoice->typ==BT_example) |
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396 | || (currentVoice->typ==BT_file) |
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397 | || (currentVoice->typ==BT_none) |
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398 | ) |
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399 | && (strncmp(anf,";return();",10)!=0) |
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400 | ) |
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401 | || (traceit&TRACE_SHOW_LINE) |
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402 | || (traceit&TRACE_SHOW_LINE1)) |
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403 | { |
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404 | if (currentVoice->typ!=BT_example) |
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405 | { |
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406 | if (currentVoice->filename==NULL) |
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407 | Print("(none) %3d%c ",yylineno,prompt_char); |
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408 | else |
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409 | Print("%s %3d%c ",currentVoice->filename,yylineno,prompt_char); |
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410 | } |
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411 | #ifdef HAVE_TCL |
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412 | if(tclmode) |
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413 | { |
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414 | PrintTCL('N',len_s,anf); |
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415 | } |
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416 | else |
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417 | #endif |
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418 | { |
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419 | fwrite(anf,1,len_s,stdout); |
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420 | mflush(); |
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421 | } |
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422 | if (traceit&TRACE_SHOW_LINE) |
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423 | { |
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424 | #ifdef HAVE_TCL |
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425 | if(!tclmode) |
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426 | #endif |
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427 | while(fgetc(stdin)!='\n'); |
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428 | } |
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429 | } |
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430 | else if (traceit&TRACE_SHOW_LINENO) |
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431 | { |
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432 | Print("{%d}",yylineno); |
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433 | mflush(); |
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434 | } |
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435 | #ifdef HAVE_SDB |
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436 | if ((blocknest==0) |
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437 | && (currentVoice->pi!=NULL) |
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438 | && (currentVoice->pi->trace_flag!=0)) |
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439 | { |
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440 | sdb(currentVoice, anf, len_s); |
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441 | } |
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442 | #endif |
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443 | prompt_char = '.'; |
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444 | return len_s; |
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445 | } |
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446 | |
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447 | int feReadLine(char* b, int l) |
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448 | { |
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449 | char *s=NULL; |
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450 | int offset = 0; /* will not be used if s==NULL*/ |
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451 | // try to read from the buffer into b, max l chars |
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452 | if (currentVoice!=NULL) |
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453 | { |
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454 | if((currentVoice->buffer!=NULL) |
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455 | && (currentVoice->buffer[currentVoice->fptr]!='\0')) |
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456 | { |
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457 | NewBuff: |
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458 | register int i=0; |
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459 | long startfptr=currentVoice->fptr; |
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460 | long tmp_ptr=currentVoice->fptr; |
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461 | l--; |
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462 | loop |
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463 | { |
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464 | register char c= |
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465 | b[i]=currentVoice->buffer[tmp_ptr/*currentVoice->fptr*/]; |
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466 | i++; |
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467 | if (yy_noeof==noeof_block) |
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468 | { |
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469 | if (c<' ') yylineno++; |
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470 | else if (c=='}') break; |
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471 | } |
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472 | else |
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473 | { |
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474 | if ((c<' ') || |
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475 | (c==';') || |
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476 | (c==')') |
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477 | ) |
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478 | break; |
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479 | } |
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480 | if (i>=l) break; |
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481 | tmp_ptr++;/*currentVoice->fptr++;*/ |
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482 | if(currentVoice->buffer[tmp_ptr/*currentVoice->fptr*/]=='\0') break; |
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483 | } |
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484 | currentVoice->fptr=tmp_ptr; |
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485 | b[i]='\0'; |
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486 | if (currentVoice->sw==BI_buffer) |
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487 | { |
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488 | if (startfptr==0) |
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489 | { |
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490 | char *anf=currentVoice->buffer; |
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491 | char *ss=strchr(anf,'\n'); |
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492 | int len; |
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493 | if (ss==NULL) len=strlen(anf); |
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494 | else len=ss-anf; |
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495 | char *s=(char *)omAlloc(len+2); |
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496 | strncpy(s,anf,len+2); |
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497 | s[len+1]='\0'; |
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498 | fePrintEcho(s,b); |
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499 | omFree((ADDRESS)s); |
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500 | } |
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501 | else if (/*(startfptr>0) &&*/ |
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502 | (currentVoice->buffer[startfptr-1]=='\n')) |
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503 | { |
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504 | char *anf=currentVoice->buffer+startfptr; |
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505 | char *ss=strchr(anf,'\n'); |
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506 | int len; |
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507 | if (ss==NULL) len=strlen(anf); |
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508 | else len=ss-anf; |
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509 | char *s=(char *)omAlloc(len+2); |
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510 | strncpy(s,anf,len+2); |
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511 | s[len+1]='\0'; |
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512 | yylineno++; |
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513 | fePrintEcho(s,b); |
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514 | omFree((ADDRESS)s); |
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515 | } |
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516 | } |
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517 | currentVoice->fptr++; |
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518 | return i; |
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519 | } |
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520 | // no buffer there or e-o-buffer or eoln: |
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521 | if (currentVoice->sw!=BI_buffer) |
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522 | { |
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523 | currentVoice->fptr=0; |
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524 | if (currentVoice->buffer==NULL) |
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525 | { |
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526 | currentVoice->buffer=(char *)omAlloc(4096-sizeof(ADDRESS)); |
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527 | omMarkAsStaticAddr(currentVoice->buffer); |
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528 | } |
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529 | } |
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530 | offset=0; |
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531 | NewRead: |
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532 | yylineno++; |
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533 | if (currentVoice->sw==BI_stdin) |
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534 | { |
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535 | feShowPrompt(); |
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536 | s=fe_fgets_stdin(fe_promptstr, |
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537 | &(currentVoice->buffer[offset]), |
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538 | (4096-1-sizeof(ADDRESS))-offset); |
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539 | int i=0; |
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540 | if (s!=NULL) |
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541 | while((s[i]!='\0') && (i<4096)) {s[i] &= (char)127;i++;} |
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542 | } |
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543 | else if (currentVoice->sw==BI_file) |
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544 | { |
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545 | s=fgets(currentVoice->buffer+offset,(4096-1-sizeof(ADDRESS))-offset, |
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546 | currentVoice->files); |
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547 | } |
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548 | //else /* BI_buffer */ s==NULL => return 0 |
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549 | // done by the default return |
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550 | } |
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551 | if (s!=NULL) |
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552 | { |
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553 | // handle prot: |
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554 | if (feProt&PROT_I) |
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555 | { |
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556 | fputs(s,feProtFile); |
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557 | } |
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558 | int rc=fePrintEcho(s,b)+1; |
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559 | //s[strlen(s)+1]='\0'; add an second \0 at the end of the string |
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560 | s[rc]='\0'; |
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561 | // handel \\ : |
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562 | rc-=3; |
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563 | if ((s[rc]=='\\')&&(currentVoice->sw!=BI_buffer)) |
---|
564 | { |
---|
565 | s[rc]='\0'; |
---|
566 | offset+=rc; |
---|
567 | if (offset<(int)omSizeOfAddr(currentVoice->buffer)) goto NewRead; |
---|
568 | } |
---|
569 | goto NewBuff; |
---|
570 | } |
---|
571 | /* else if (s==NULL) */ |
---|
572 | { |
---|
573 | char *err; |
---|
574 | switch(yy_noeof) |
---|
575 | { |
---|
576 | case noeof_brace: |
---|
577 | case noeof_block: |
---|
578 | err="{...}"; |
---|
579 | break; |
---|
580 | case noeof_asstring: |
---|
581 | err="till `.`"; |
---|
582 | break; |
---|
583 | case noeof_string: |
---|
584 | err="string"; |
---|
585 | break; |
---|
586 | case noeof_bracket: |
---|
587 | err="(...)"; |
---|
588 | break; |
---|
589 | case noeof_procname: |
---|
590 | err="proc"; |
---|
591 | break; |
---|
592 | case noeof_comment: |
---|
593 | err="/*...*/"; |
---|
594 | break; |
---|
595 | default: |
---|
596 | return 0; |
---|
597 | } |
---|
598 | Werror("premature end of file while reading %s",err); |
---|
599 | return 0; |
---|
600 | } |
---|
601 | } |
---|
602 | |
---|
603 | #ifdef __MWERKS__ |
---|
604 | #ifdef __cplusplus |
---|
605 | extern "C" { |
---|
606 | #endif |
---|
607 | #ifdef macintosh |
---|
608 | int isatty(int filedes); |
---|
609 | #else |
---|
610 | int _isatty(int filedes); |
---|
611 | #define isatty _isatty |
---|
612 | #endif /* macintosh */ |
---|
613 | #ifdef __cplusplus |
---|
614 | } |
---|
615 | #endif |
---|
616 | #endif |
---|
617 | /*2 |
---|
618 | * init all data structures |
---|
619 | */ |
---|
620 | #ifndef STDIN_FILENO |
---|
621 | #define STDIN_FILENO 0 |
---|
622 | #endif |
---|
623 | Voice * feInitStdin() |
---|
624 | { |
---|
625 | Voice *p = new Voice; |
---|
626 | p->files = stdin; |
---|
627 | #ifdef HAVE_TCL |
---|
628 | p->sw = (tclmode || isatty(STDIN_FILENO)) ? BI_stdin : BI_file; |
---|
629 | #else |
---|
630 | p->sw = (isatty(STDIN_FILENO)) ? BI_stdin : BI_file; |
---|
631 | #endif |
---|
632 | p->filename = omStrDup("STDIN"); |
---|
633 | p->start_lineno = 1; |
---|
634 | omMarkAsStaticAddr(p); |
---|
635 | omMarkAsStaticAddr(p->filename); |
---|
636 | return p; |
---|
637 | } |
---|