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annotate src/buildkeywordtab.c @ 123:5681cdada362

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Redo keyword table handling to handle keywords differing in length Some keywords differ only due to length. That is, the shorter keyword matches the leading characters of the longer one. Make the keyword table builder and processor handle these cases. Also re-implement the handler based on evolved understanding of its requirements.
author William Astle <lost@l-w.ca>
date Mon, 01 Jan 2024 15:15:45 -0700
parents 5d5472b11ccd
children 8770e6f977c3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 Build the keyword parse table for lwbasic
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3 */
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4
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5 #define _POSIX_C_SOURCE 200809L // for getline()
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6
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10
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11 struct treenode
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12 {
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13 int ccode;
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14 char *toksym;
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15 struct treenode *nextsibling;
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16 struct treenode *firstchild;
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17 };
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18
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19 /*
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20 lookaheaddepth will start at 255 and count down which gives an appropriate
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21 two's complement negative number.
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22 */
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23
121
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24 int treedepth = 0;
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25 void print_tree(FILE *fp, struct treenode *tn, char *lookahead, int lookaheaddepth)
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26 {
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27 struct treenode *tn1;
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28 int depth = ++treedepth;
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29
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30 fprintf(fp, "parse_wt%d fdb parse_wt%de-parse_wt%d-2\n", depth, depth, depth);
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31
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32 for (tn1 = tn -> firstchild; tn1; tn1 = tn1 -> nextsibling)
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33 {
123
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34 // if there are child nodes, insert the sub tree
121
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35 if (tn1 -> firstchild)
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36 {
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37 fprintf(fp, " fcb 0x%02x,token_eot\n", tn1 -> ccode);
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38 if (tn1 -> toksym)
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39 {
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40 print_tree(fp, tn1, tn1 -> toksym, 255);
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41 }
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42 else
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43 {
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44 if (lookahead)
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45 {
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46 print_tree(fp, tn1, lookahead, lookaheaddepth - 1);
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47 }
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48 else
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49 {
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50 print_tree(fp, tn1, NULL, 0);
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51 }
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52 }
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53 }
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54 // if there is also a terminal symbol here
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55 if (tn1 -> toksym)
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56 {
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57 fprintf(fp, " fcb 0x%02x,%s\n", tn1 -> ccode, tn1 -> toksym);
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58 }
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59 }
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60 // handle lookahead failure
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61 if (lookahead)
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62 {
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63 fprintf(fp, " fcb 0x%02x,%s\n", lookaheaddepth, lookahead);
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64 }
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65
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66 fprintf(fp, "parse_wt%de\n", depth);
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67 }
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68
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69 int main(int argc, char **argv)
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70 {
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71 FILE *infile, *outfile;
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72 struct treenode *treeroot;
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73 struct treenode *tnp, *tn, *tnprev;
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74 char *linebuf = NULL;
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75 size_t bufsize = 0;
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76 ssize_t rval;
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77 char *ptr, *ptr2;
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78
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79 if (argc != 3)
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80 {
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81 fprintf(stderr, "Usage: %s <source> <output>\n", argv[0]);
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82 exit(1);
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83 }
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84
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85 infile = fopen(argv[1], "rb");
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86 if (!infile)
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87 {
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88 perror("Opening input file");
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89 exit(1);
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90 }
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91
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92 treeroot = calloc(1, sizeof(struct treenode));
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93 while (1)
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94 {
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95 rval = getline(&linebuf, &bufsize, infile);
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96 if (rval == -1)
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97 {
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98 if (feof(infile))
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99 break;
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100 perror("Reading keyword list line");
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101 fclose(infile);
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102 if (linebuf) free(linebuf);
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103 exit(1);
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104 }
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105 ptr = linebuf + rval - 1;
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106 // lose any line terminators
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107 while (*ptr == '\r' || *ptr == '\n')
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108 *ptr-- = '\0';
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109 ptr = strchr(linebuf, ',');
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110 if (!ptr)
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111 {
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112 fprintf(stderr, "WARNING: malformed input line\n");
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113 continue;
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114 }
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115 *ptr++ = '\0'; // put a NUL break in
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116 tnp = treeroot;
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117 for (ptr2 = linebuf; *ptr2; ptr2++)
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118 {
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119 for (tn = tnp -> firstchild, tnprev = NULL; tn; tn = tn -> nextsibling)
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120 {
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121 if (tn -> ccode == *ptr2)
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122 break;
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123 tnprev = tn;
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124 }
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125 if (!tn)
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126 {
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127 tn = calloc(1, sizeof(struct treenode));
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128 tn -> ccode = *ptr2;
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129 if (!*(ptr2 + 1))
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130 tn -> toksym = strdup(ptr);
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131 if (tnprev)
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132 tnprev -> nextsibling = tn;
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133 else
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134 tnp -> firstchild = tn;
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135 fprintf(stderr, "Create entry: %c, %s\n", tn -> ccode, tn -> toksym);
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136 }
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137 tnp = tn;
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138 }
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139 }
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140 fclose(infile);
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141
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142 outfile = fopen(argv[2], "wb");
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143 if (!outfile)
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144 {
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145 perror("Opening output file");
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146 exit(1);
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147 }
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148 fprintf(outfile, "; This file is automatically generated. Edit %s and rebuild to make changes.\n", argv[1]);
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149 fprintf(outfile, " *pragmapush list\n *pragma list\n");
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150 fprintf(outfile, "parse_wordtab\n");
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151 print_tree(outfile, treeroot, NULL, 0);
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152 fprintf(outfile, " *pragmapop list\n");
121
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William Astle <lost@l-w.ca>
parents:
diff changeset
153 fclose(outfile);
5d5472b11ccd Initital skeleton of separation of separate parsing scheme
William Astle <lost@l-w.ca>
parents:
diff changeset
154 exit(0);
5d5472b11ccd Initital skeleton of separation of separate parsing scheme
William Astle <lost@l-w.ca>
parents:
diff changeset
155 }