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194 lignes
3.6 KiB
194 lignes
3.6 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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STAR,
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PLUS
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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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char advance(Exploration *exploration)
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{
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return exploration->text[exploration->position++];
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}
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int endExploration(Exploration *exploration)
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{
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if (exploration->position >= strlen(exploration->text))
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{
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return 1;
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} else
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{
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return -1;
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}
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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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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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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 pos= in->position;
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for (int i=0; i < strlen(node->stringValue);i++)
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{
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if (advance(in) != node->stringValue[i])
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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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}
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return endExploration(in);
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}
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case AND: {
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int pos= in->position;
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if (execute(node->children[0], in) == 0) //si il y a eu une erreur
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{
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setPosition(in, pos);
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return 0;
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} else //si ça s'est bien passé
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{
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int result= execute(node->children[1], in);
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if (result == 0) {
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setPosition(in, pos);
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}
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return result;
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}
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}
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case STAR: {
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int pos= in->position;
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int result;
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while ((result= execute(node->children[0], in)) == -1){
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pos= in->position;;
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}
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if (result == 0) {
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setPosition(in, pos);
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}
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return endExploration(in);
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}
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case PLUS: {
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Node *newNode= mkAnd(node->children[0], mkStar(node->children[0]));
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return execute(newNode,in);
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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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mkAnd(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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if (execute(program, in)<=0)
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{
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printf("no match\n");
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} else
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{
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printf("match\n");
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}// 0 => no match, 1 => match
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/*Input *in1= mkInput("hello");
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Input *in2= mkInput("world");
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Input *in3= mkInput("hello world");
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Node *program=
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mkOr(mkString("hello"), // "hello" | "world"
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mkString("world"));
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printf("%i\n", execute(program, in)); // 0 => no match, 1 => match*/
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return 0;
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}
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