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annotate actions.c @ 30:cd979b979610

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fixed multiple (un)indentions in read_input; some better comments
author meillo@marmaro.de
date Fri, 22 Feb 2008 14:47:47 +0100
parents f0856c177403
children 4e60d96265f0
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include "baum.h"
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5 #include "actions.h"
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6
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7 unsigned char action_print(struct Node* node);
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8 unsigned char action_sum(struct Node* node);
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9 unsigned char action_number(struct Node* node);
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10 unsigned char action_input(struct Node* node);
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11 unsigned char action_times(struct Node* node);
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12 unsigned char action_blackhole(struct Node* node);
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16 unsigned char action(struct Node* node) {
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17 if (node == NULL) {
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18 fprintf(stderr, "action of non existing node\n");
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19 return 0;
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20 }
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22 logit(node->name);
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24 if (strcmp(node->name, "print") == 0) {
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25 return action_print(node);
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27 } else if (strcmp(node->name, "sum") == 0) {
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28 return action_sum(node);
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30 } else if (strcmp(node->name, "number") == 0) {
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31 return action_number(node);
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33 } else if (strcmp(node->name, "input") == 0) {
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34 return action_input(node);
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36 } else if (strcmp(node->name, "times") == 0) {
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37 return action_times(node);
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39 } else if (strcmp(node->name, "blackhole") == 0) {
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40 return action_blackhole(node);
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42 } else {
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43 fprintf(stderr, "unknown kind of node");
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44 exit(4);
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45 }
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46 }
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50 unsigned char action_print(struct Node* node) {
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51 unsigned char result;
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52 result = action(node->down);
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53 if (node->value == 'c') {
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54 printf("%c", result);
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55 } else {
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56 printf("%d", result);
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57 }
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58 return result;
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59 }
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61
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62 unsigned char action_sum(struct Node* node) {
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63 struct Node* tp;
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64 tp = node->down;
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65 while (tp != NULL) {
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66 node->value += action(tp);
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67 tp = tp->right;
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68 }
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69 return node->value;
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70 }
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73 unsigned char action_number(struct Node* node) {
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74 return node->value;
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75 }
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78 unsigned char action_input(struct Node* node) {
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79 /* reads a number which is treated as ASCII value */
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80 int input;
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81 printf("input: ");
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82 scanf("%d", &input);
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83 input = input % 256;
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84 insertLast(node, newNode("number", (char) input));
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86 return 0;
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87 }
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90 unsigned char action_times(struct Node* node) {
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91 struct Node* tp;
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92 struct Node* last;
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93 unsigned char i;
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94 tp = node->down;
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95 for (i = 0; i < node->value; i++) {
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96 /* FIXME deep copy */
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97 last = insertLast(node, newNode(tp->name, tp->value));
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98 if (tp->down != NULL) {
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99 last->down = newNode(tp->down->name, tp->down->value);
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100 }
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101
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102 }
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103 return 0;
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104 }
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107 unsigned char action_blackhole(struct Node* node) {
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108 action(node->down);
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109 return 0;
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110 }
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111
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112