74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
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#include <stdlib.h>
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#include "syntax.h"
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struct SyntaxElement* se_create(void) {
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struct SyntaxElement* syntaxelement = malloc(sizeof(struct SyntaxElement));
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syntaxelement->type = NONE;
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syntaxelement->content = NULL;
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syntaxelement->next = NULL;
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syntaxelement->top = NULL;
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return syntaxelement;
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}
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struct SyntaxElement* se_bottom(struct SyntaxElement* syntaxelement) {
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syntaxelement->content = se_create();
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((struct SyntaxElement*)syntaxelement->content)->top = syntaxelement;
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return ((struct SyntaxElement*)syntaxelement->content);
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}
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struct SyntaxElement* se_next(struct SyntaxElement* syntaxelement) {
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syntaxelement->next = se_create();
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syntaxelement->next->top = syntaxelement->top;
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return syntaxelement->next;
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}
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void se_free(struct SyntaxElement* syntaxtree) {
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switch (syntaxtree->type) {
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case NONE:
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free(syntaxtree);
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return;
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case TREE:
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case TOPTREE:
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if (syntaxtree->content != NULL) {
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se_free((struct SyntaxElement*)syntaxtree->content);
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}
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break;
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default:
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free(syntaxtree->content);
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break;
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}
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if (syntaxtree->next != NULL) {
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se_free(syntaxtree->next);
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}
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free(syntaxtree);
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}
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// Remove NONEs from the syntax tree.
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void se_clean(struct SyntaxElement* syntaxtree) {
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if (syntaxtree->next != NULL) {
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switch (syntaxtree->next->type) {
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case NONE:
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free(syntaxtree->next);
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syntaxtree->next = NULL;
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break;
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default:
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se_clean(syntaxtree->next);
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break;
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}
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}
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if (syntaxtree->content != NULL && (syntaxtree->type == TOPTREE || syntaxtree->type == TREE)) {
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switch (((struct SyntaxElement*)syntaxtree->content)->type) {
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case NONE:
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free(syntaxtree->content);
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syntaxtree->content = NULL;
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break;
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default:
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se_clean((struct SyntaxElement*)syntaxtree->content);
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break;
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}
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}
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}
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