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7597 | akron1 | 1 | (* |
2 | BSD 2-Clause License |
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3 | |||
4 | Copyright (c) 2018, Anton Krotov |
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5 | All rights reserved. |
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6 | *) |
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7 | |||
8 | MODULE TEXTDRV; |
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9 | |||
10 | IMPORT FILES, C := COLLECTIONS; |
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11 | |||
12 | |||
13 | CONST |
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14 | |||
15 | CR = 0DX; LF = 0AX; |
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16 | |||
17 | CHUNK = 1024 * 256; |
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18 | |||
19 | |||
20 | TYPE |
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21 | |||
22 | TEXT* = POINTER TO RECORD (C.ITEM) |
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23 | |||
24 | chunk: ARRAY CHUNK OF BYTE; |
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25 | pos, size: INTEGER; |
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26 | file: FILES.FILE; |
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27 | utf8: BOOLEAN; |
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28 | CR: BOOLEAN; |
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29 | |||
30 | line*, col*: INTEGER; |
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31 | eof*: BOOLEAN; |
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32 | eol*: BOOLEAN; |
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33 | |||
34 | open*: PROCEDURE (text: TEXT; name: ARRAY OF CHAR): BOOLEAN; |
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35 | peak*: PROCEDURE (text: TEXT): CHAR; |
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36 | nextc*: PROCEDURE (text: TEXT) |
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37 | |||
38 | END; |
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39 | |||
40 | |||
41 | VAR |
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42 | |||
43 | texts: C.COLLECTION; |
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44 | |||
45 | |||
46 | PROCEDURE reset (text: TEXT); |
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47 | BEGIN |
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48 | text.chunk[0] := 0; |
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49 | text.pos := 0; |
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50 | text.size := 0; |
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51 | text.file := NIL; |
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52 | text.utf8 := FALSE; |
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53 | text.CR := FALSE; |
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54 | text.line := 1; |
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55 | text.col := 1; |
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56 | text.eof := FALSE; |
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57 | text.eol := FALSE |
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58 | END reset; |
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59 | |||
60 | |||
61 | PROCEDURE peak (text: TEXT): CHAR; |
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62 | RETURN CHR(text.chunk[text.pos]) |
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63 | END peak; |
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64 | |||
65 | |||
66 | PROCEDURE load (text: TEXT); |
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67 | BEGIN |
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68 | IF ~text.eof THEN |
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69 | text.size := FILES.read(text.file, text.chunk, LEN(text.chunk)); |
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70 | text.pos := 0; |
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71 | IF text.size = 0 THEN |
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72 | text.eof := TRUE; |
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73 | text.chunk[0] := 0 |
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74 | END |
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75 | END |
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76 | END load; |
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77 | |||
78 | |||
79 | PROCEDURE next (text: TEXT); |
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80 | VAR |
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81 | c: CHAR; |
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82 | BEGIN |
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83 | IF text.pos < text.size - 1 THEN |
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84 | INC(text.pos) |
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85 | ELSE |
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86 | load(text) |
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87 | END; |
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88 | |||
89 | IF ~text.eof THEN |
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90 | |||
91 | c := peak(text); |
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92 | |||
93 | IF c = CR THEN |
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94 | INC(text.line); |
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95 | text.col := 0; |
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96 | text.eol := TRUE; |
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97 | text.CR := TRUE |
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98 | ELSIF c = LF THEN |
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99 | IF ~text.CR THEN |
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100 | INC(text.line); |
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101 | text.col := 0; |
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102 | text.eol := TRUE |
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103 | ELSE |
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104 | text.eol := FALSE |
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105 | END; |
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106 | text.CR := FALSE |
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107 | ELSE |
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108 | text.eol := FALSE; |
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109 | IF text.utf8 THEN |
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110 | IF (c < 80X) OR (c > 0BFX) THEN |
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111 | INC(text.col) |
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112 | END |
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113 | ELSE |
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114 | INC(text.col) |
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115 | END; |
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116 | text.CR := FALSE |
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117 | END |
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118 | |||
119 | END |
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120 | |||
121 | END next; |
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122 | |||
123 | |||
124 | PROCEDURE init (text: TEXT); |
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125 | BEGIN |
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126 | |||
127 | IF (text.pos = 0) & (text.size >= 3) THEN |
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128 | IF (text.chunk[0] = 0EFH) & |
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129 | (text.chunk[1] = 0BBH) & |
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130 | (text.chunk[2] = 0BFH) THEN |
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131 | text.pos := 3; |
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132 | text.utf8 := TRUE |
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133 | END |
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134 | END; |
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135 | |||
136 | IF text.size = 0 THEN |
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137 | text.chunk[0] := 0; |
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138 | text.size := 1; |
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139 | text.eof := FALSE |
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140 | END; |
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141 | |||
142 | text.line := 1; |
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143 | text.col := 1 |
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144 | |||
145 | END init; |
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146 | |||
147 | |||
148 | PROCEDURE open (text: TEXT; name: ARRAY OF CHAR): BOOLEAN; |
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149 | BEGIN |
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150 | ASSERT(text # NIL); |
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151 | |||
152 | reset(text); |
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153 | text.file := FILES.open(name); |
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154 | IF text.file # NIL THEN |
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155 | load(text); |
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156 | init(text) |
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157 | END |
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158 | |||
159 | RETURN text.file # NIL |
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160 | END open; |
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161 | |||
162 | |||
163 | PROCEDURE NewText (): TEXT; |
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164 | VAR |
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165 | text: TEXT; |
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166 | citem: C.ITEM; |
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167 | |||
168 | BEGIN |
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169 | citem := C.pop(texts); |
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170 | IF citem = NIL THEN |
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171 | NEW(text) |
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172 | ELSE |
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173 | text := citem(TEXT) |
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174 | END |
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175 | |||
176 | RETURN text |
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177 | END NewText; |
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178 | |||
179 | |||
180 | PROCEDURE create* (): TEXT; |
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181 | VAR |
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182 | text: TEXT; |
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183 | BEGIN |
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184 | text := NewText(); |
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185 | reset(text); |
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186 | text.open := open; |
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187 | text.peak := peak; |
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188 | text.nextc := next |
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189 | |||
190 | RETURN text |
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191 | END create; |
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192 | |||
193 | |||
194 | PROCEDURE destroy* (VAR text: TEXT); |
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195 | BEGIN |
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196 | IF text # NIL THEN |
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197 | IF text.file # NIL THEN |
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198 | FILES.close(text.file) |
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199 | END; |
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200 | |||
201 | C.push(texts, text); |
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202 | text := NIL |
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203 | END |
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204 | END destroy; |
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205 | |||
206 | |||
207 | BEGIN |
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208 | texts := C.create() |
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209 | END TEXTDRV.>> |