Mercurial > baum

annotate baum.c @ 34:e986c6abed2b

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eliminated generic blackhole node at root
author meillo@marmaro.de
date Sat, 01 Mar 2008 17:45:55 +0100
parents 2e564bf8599c
children 29172b6e802a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * baum - an esoteric programming language
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3 *
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4 * (c) markus schnalke <meillo@marmaro.de>
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5 * and julian forster
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6 *
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7 */
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8
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9
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13
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14 #include "baum.h"
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15 #include "actions.h"
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16
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17 #define VERSION "0.2"
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19
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20 int option_verbose = 0;
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21
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22 struct Node* root = 0;
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23 struct Stackitem* stack = NULL;
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26 void printNode(struct Node* node, int level);
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27 void printTree(struct Node* root, int level);
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28 struct Node* lastNode(struct Node* node);
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29 void delete(struct Node* node);
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32
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33 void logit(char* text) {
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34 if (option_verbose) {
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35 fprintf(stderr, "[%s]\n", text);
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36 }
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37 }
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40 /* new */
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41 struct Node* newNode(char* name, unsigned char value) {
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42 struct Node* node;
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43 node = (struct Node*) malloc(sizeof(struct Node));
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44 strcpy(node->name, name);
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45 node->value = value;
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46 node->right = 0;
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47 node->down = 0;
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48 return node;
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49 }
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50
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51
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52
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53 struct Node* lastNode(struct Node* node) {
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54 while (node->right != NULL) {
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55 node = node->right;
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56 }
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57 return node;
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58 }
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59
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60 struct Node* insertLast(struct Node* node, struct Node* insert) {
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61 node = lastNode(node);
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62 node->right = insert;
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63 return insert;
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64 }
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66
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67 /* delete */
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68 void delete(struct Node* node) {
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69 if (node == NULL) {
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70 return;
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71 }
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72 delete(node->down);
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73 delete(node->right);
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74 free(node); node=0;
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75 }
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78 /* print */
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79 void printNode(struct Node* node, int level) {
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80 if (node != NULL) {
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81 while (level-- > 0) {
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82 fprintf(stderr, "\t");
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83 }
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84 fprintf(stderr, "%s (%d|%c)\n", node->name, node->value, node->value);
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85 }
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86 }
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87
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88 void printTree(struct Node* root, int level) {
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89 if (root == NULL) {
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90 return;
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91 }
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92 printNode(root, level);
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93 printTree(root->down, level+1);
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94 printTree(root->right, level);
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95 }
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100
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101 /* stack for read_input */
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102 void push(struct Node* node) {
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103 struct Stackitem* tmp;
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104 struct Stackitem* new;
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105 new = (struct Stackitem*) malloc(sizeof(struct Stackitem));
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106 new->node = node;
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107 tmp = stack;
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108 stack = new;
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109 stack->next = tmp;
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110 }
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111 struct Node* pull() {
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112 if (stack == NULL) {
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113 return NULL;
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114 }
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115 struct Stackitem* tmp;
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116 struct Node* node;
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117 tmp = stack;
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118 stack = stack->next;
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119 node = tmp->node;
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120 free(tmp); tmp=0;
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121 return node;
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122 }
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123
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125
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126 /* read input */
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127 void read_input(char* filename) {
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128 int c;
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129 int indent;
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130 char name[256];
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131 int value;
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132 int last_indent;
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133 struct Node* last_node;
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134 struct Node* node;
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135 FILE* file;
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136
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137 indent = 0;
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138 strcpy(name, "");
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139 value = 0;
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140 last_indent = -1;
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141 last_node = NULL;
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142 file = fopen(filename, "r");
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143
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144 while ((c = getc(file)) != EOF) {
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145 if (c == '#') { /* comment */
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146 while ((c = getc(file)) != '\n') {
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147 }
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148 }
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149
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150 if (c == ' ' || c == '\t') { /* indent if at start of line */
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151 if (strlen(name) == 0) {
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152 indent++;
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153 }
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154 }
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155
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156 if (c == '\n') { /* end of line: create node */
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157 if (strlen(name) > 0) {
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158 if (option_verbose) {
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159 fprintf(stderr, " %d - %s - %d\n", indent, name, value);
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160 }
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161 /* create node */
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162 node = newNode((char*) name, value);
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163 if (indent > last_indent) { /* down */
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164 /* if it goes more than one level down -> error */
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165 if (indent > last_indent + 1) {
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166 fprintf(stderr, "error: Indention over more than one level. Only indent by one!\n");
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167 exit(5);
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168 }
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169 if (last_node == NULL) {
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170 root = node;
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171 last_node = root;
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172 } else {
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173 last_node->down = node;
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174 }
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175 push(last_node);
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176 } else if (indent == last_indent) { /* right */
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177 last_node->right = node;
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178 } else if (indent < last_indent) { /* up */
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179 /* handle if it goes more than one level up */
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180 while (indent < last_indent) {
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181 last_node = pull();
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182 last_indent--;
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183 }
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184 last_node->right = node;
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185 }
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186 last_indent = indent;
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187 last_node = node;
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188 }
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189 indent = 0;
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190 strcpy(name, "");
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191 value = 0;
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192 }
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193
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194 if (c >= 'a' && c <= 'z') { /* name */
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195 int i = 1;
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196 name[0] = (char) c;
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197 while ((c = getc(file)) != '(') {
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198 name[i] = (char) c;
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199 i++;
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200 if (i > 255) {
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201 fprintf(stderr, "error: node name too long, or no value given\n");
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202 exit(6);
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203 }
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204 }
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205 name[i] = '\0';
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206 }
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207
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208 if (c == '(') { /* value */
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209 fscanf(file, "%d)", &value);
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210 }
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211
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212 }
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213
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214 /* clear stack */
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215 while (stack != NULL) {
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216 pull();
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217 }
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218
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219 fclose(file);
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220 }
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221
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222
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223
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224 /* main */
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225 int main(int argc, char* argv[]) {
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226 unsigned char shell_return = 0;
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227
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228 while (--argc > 0 && (*++argv)[0] == '-') {
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229 if (strcmp(argv[0], "--version") == 0) {
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230 printf("\
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231 baum %s\n\
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232 an esoteric programming language\n\
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233 by markus schnalke and julian forster\n\
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234 http://prog.marmaro.de/baum\n\
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235 ", VERSION);
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236 exit(0);
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237 } else if (strcmp(argv[0], "--help") == 0) {
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238 printf("\
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239 baum --version print version information and exit\n\
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240 baum --help print this output\n\
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241 baum [-v] <file> (verbosly) run file\n\
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242 ");
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243 exit(0);
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244 } else if (strcmp(argv[0], "-v") == 0) {
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245 option_verbose = 1;
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246 /*
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247 } else if (strcmp(argv[0], "-W") == 0) {
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248 / * TODO: catch if no value given * /
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249 iDWarn = atoi((++argv)[0]);
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250 argc--;
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251 */
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252 } else {
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253 fprintf(stderr, "unknown option: %s\n", argv[0]);
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254 exit(127);
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255 }
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256 }
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257
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258 if (argc != 1) {
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259 fprintf(stderr, "%d source files given, please specify one.\n", argc);
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260 exit(3);
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261 }
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262
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263 read_input(argv[0]);
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264
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265 if (option_verbose) {
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266 printTree(root, 0);
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267 }
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268
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269 shell_return = action(root);
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270 fflush(stdout);
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271
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272 if (option_verbose) {
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273 printTree(root, 0);
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274 }
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275
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276 delete(root);
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277 exit(shell_return);
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278 }