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259 lines
4.7 KiB
259 lines
4.7 KiB
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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typedef struct Node Node;
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typedef struct Exploration Exploration;
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enum opcode {
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STRING,
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AND,
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OR,
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STAR,
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PLUS,
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CLASS,
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QUESTION_MARK,
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EXCLAMATION_MARK,
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DOT
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};
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struct Exploration
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{
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int position;
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char *text;
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};
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Exploration *mkExploration(char *text)
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{
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Exploration *exploration = calloc(1,sizeof(Exploration*)); //sizeof du type pointeur
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exploration->position= 0;
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exploration->text= text;
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return exploration;
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}
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void advance(Exploration *exploration, int add)
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{
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exploration->position+= add;
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}
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int atEnd(Exploration *exploration) {
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return exploration->text[exploration->position] == 0;
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}
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void setPosition(Exploration *exploration, int position)
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{
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exploration->position= position;
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}
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int getPosition(Exploration *exploration) {
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return exploration->position;
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}
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int currentChar(Exploration *exploration)
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{
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return exploration->text[exploration->position];
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}
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char *currentText(Exploration *exploration)
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{
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return exploration->text + exploration->position;
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}
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struct Node
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{
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enum opcode type;
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union {
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char *stringValue;
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Node *children[2];
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};
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};
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Node *mkNode(enum opcode type)
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{
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Node *node= calloc(1, sizeof(Node));
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node->type= type;
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return node;
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}
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Node *mkString(char *value)
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{
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Node *node= mkNode(STRING);
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node->stringValue= value;
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return node;
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}
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Node *mkAnd(Node *node1, Node *node2)
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{
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Node *node= mkNode(AND);
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node->children[0]= node1;
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node->children[1]= node2;
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return node;
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}
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Node *mkStar(Node *child)
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{
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Node *node= mkNode(STAR);
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node->children[0]= child;
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return node;
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}
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Node *mkPlus(Node *child)
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{
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Node *node= mkNode(PLUS);
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node->children[0]= child;
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return node;
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}
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Node *mkOr(Node *node1, Node *node2)
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{
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Node *node= mkNode(OR);
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node->children[0]= node1;
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node->children[1]= node2;
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return node;
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}
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Node *mkClass(char* str)
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{
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Node *node= mkNode(CLASS);
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node->stringValue= str;
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return node;
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}
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Node *mkQuestionMark(Node *child)
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{
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Node *node= mkNode(QUESTION_MARK);
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node->children[0]= child;
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return node;
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}
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Node *mkExclamationMark(Node *child)
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{
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Node *node= mkNode(EXCLAMATION_MARK);
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node->children[0]= child;
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return node;
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}
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Node *mkDot()
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{
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Node *node= mkNode(DOT);
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return node;
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}
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int execute(Node *node, Exploration *in)
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{
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switch (node->type) {
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case STRING: {
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int length= strlen(node->stringValue);
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if (strncmp(currentText(in), node->stringValue, length)) {
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return 0;
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}
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advance(in, length);
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return 1;
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}
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case AND: {
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int pos= getPosition(in);
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if (!execute(node->children[0], in)) //si il y a eu une erreur
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{
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return 0;
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} //si ça s'est bien passé
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if (!execute(node->children[1], in)) {
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setPosition(in, pos);
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return 0;
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}
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return 1;
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}
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case OR: {
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if (execute(node->children[0], in)) {
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return 1;
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}
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return execute(node->children[1], in);
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}
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case STAR: {
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while (execute(node->children[0], in));
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return 1;
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}
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case PLUS: {
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if (!execute(node->children[0], in)) {
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return 0;
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}
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while (execute(node->children[0], in));
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return 1;
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}
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case CLASS: {
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if (!currentChar(in)) {
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return 0;
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}
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if (strchr(node->stringValue, currentChar(in))) {
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advance(in, 1);
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return 1;
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}
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return 0;
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}
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case QUESTION_MARK: {
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execute(node->children[0], in);
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return 1;
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}
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case EXCLAMATION_MARK: {
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int pos= getPosition(in);
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if (!execute(node->children[0], in)) {
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return 1;
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}
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setPosition(in, pos);
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return 0;
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}
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case DOT: {
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if (atEnd(in)) {
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return 0;
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}
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advance(in, 1);
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return 1;
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}
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}
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printf("this cannot happen\n");
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abort();
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}
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int main(int argc, char **argv)
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{
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Exploration *in= mkExploration("aabbcc");
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/*Node *program=
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mkString("aabbcc");
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Node *program=
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mkAnd(mkString("aab"),
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mkString("bcc"));*/
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/*Node *program=
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mkAnd(mkString("aa"),
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mkAnd(mkString("bb"),
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mkString("cc")));*/
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/*Node *program=
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mkOr(mkPlus(mkString("a")), // "a"*"b"*"c"*
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mkAnd(mkStar(mkString("b")),
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mkStar(mkString("c"))));*/
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Node *program= mkStar(mkClass("abc"));
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if (!execute(program, in) || !atEnd(in))
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{
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printf("no match, current position : %i\n", getPosition(in));
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} else
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{
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printf("match, current position : %i\n", getPosition(in));
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}// 0 => no match, 1 => match
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return 0;
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}
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