* Strips the whitespaces from the end of s.
* By default (when char_list=NULL), these characters get stripped:
*
- * - " " (ASCII 32 (0x20)) space.
- * - "\t" (ASCII 9 (0x09)) tab.
- * - "\n" (ASCII 10 (0x0A)) line feed.
- * - "\r" (ASCII 13 (0x0D)) carriage return.
- * - "\0" (ASCII 0 (0x00)) NULL.
- * - "\x0B" (ASCII 11 (0x0B)) vertical tab.
+ * - " " (ASCII 32 (0x20)) space.
+ * - "\t" (ASCII 9 (0x09)) tab.
+ * - "\n" (ASCII 10 (0x0A)) line feed.
+ * - "\r" (ASCII 13 (0x0D)) carriage return.
+ * - "\0" (ASCII 0 (0x00)) NULL.
+ * - "\x0B" (ASCII 11 (0x0B)) vertical tab.
*
* @param s The string to strip. Modified in place.
* @param char_list A string which contains the characters you want to strip.
* Strips the whitespaces from the begining of s.
* By default (when char_list=NULL), these characters get stripped:
*
- * - " " (ASCII 32 (0x20)) space.
- * - "\t" (ASCII 9 (0x09)) tab.
- * - "\n" (ASCII 10 (0x0A)) line feed.
- * - "\r" (ASCII 13 (0x0D)) carriage return.
- * - "\0" (ASCII 0 (0x00)) NULL.
- * - "\x0B" (ASCII 11 (0x0B)) vertical tab.
+ * - " " (ASCII 32 (0x20)) space.
+ * - "\t" (ASCII 9 (0x09)) tab.
+ * - "\n" (ASCII 10 (0x0A)) line feed.
+ * - "\r" (ASCII 13 (0x0D)) carriage return.
+ * - "\0" (ASCII 0 (0x00)) NULL.
+ * - "\x0B" (ASCII 11 (0x0B)) vertical tab.
*
* @param s The string to strip. Modified in place.
* @param char_list A string which contains the characters you want to strip.
* Strips the whitespaces from both the beginning and the end of s.
* By default (when char_list=NULL), these characters get stripped:
*
- * - " " (ASCII 32 (0x20)) space.
- * - "\t" (ASCII 9 (0x09)) tab.
- * - "\n" (ASCII 10 (0x0A)) line feed.
- * - "\r" (ASCII 13 (0x0D)) carriage return.
- * - "\0" (ASCII 0 (0x00)) NULL.
- * - "\x0B" (ASCII 11 (0x0B)) vertical tab.
+ * - " " (ASCII 32 (0x20)) space.
+ * - "\t" (ASCII 9 (0x09)) tab.
+ * - "\n" (ASCII 10 (0x0A)) line feed.
+ * - "\r" (ASCII 13 (0x0D)) carriage return.
+ * - "\0" (ASCII 0 (0x00)) NULL.
+ * - "\x0B" (ASCII 11 (0x0B)) vertical tab.
*
* @param s The string to strip.
* @param char_list A string which contains the characters you want to strip.
/** @brief Replaces a set of variables by their values
*
- * @param str where to apply the change
- * @param patterns what to change
+ * @param str The input of the replacement process
+ * @param patterns The changes to apply
* @return The string modified
*
- * Check xbt_strbuff_varsubst() for more details, and remember that the string may be reallocated (moved) in the process.
+ * Both '$toto' and '${toto}' are valid (and the two writing are equivalent).
+ *
+ * If the variable name contains spaces, use the brace version (ie, ${toto tutu})
+ *
+ * You can provide a default value to use if the variable is not set in the dict by using
+ * '${var:=default}' or '${var:-default}'. These two forms are equivalent, even if they
+ * shouldn't to respect the shell standard (:= form should set the value in the dict,
+ * but does not) (BUG).
*/
-char *xbt_str_varsubst(char *str, xbt_dict_t patterns)
+char *xbt_str_varsubst(const char *str, xbt_dict_t patterns)
{
xbt_strbuff_t buff = xbt_strbuff_new_from(str);
char *res;
*
* By default (with sep=NULL), these characters are used as separator:
*
- * - " " (ASCII 32 (0x20)) space.
- * - "\t" (ASCII 9 (0x09)) tab.
- * - "\n" (ASCII 10 (0x0A)) line feed.
- * - "\r" (ASCII 13 (0x0D)) carriage return.
- * - "\0" (ASCII 0 (0x00)) NULL.
- * - "\x0B" (ASCII 11 (0x0B)) vertical tab.
+ * - " " (ASCII 32 (0x20)) space.
+ * - "\t" (ASCII 9 (0x09)) tab.
+ * - "\n" (ASCII 10 (0x0A)) line feed.
+ * - "\r" (ASCII 13 (0x0D)) carriage return.
+ * - "\0" (ASCII 0 (0x00)) NULL.
+ * - "\x0B" (ASCII 11 (0x0B)) vertical tab.
*/
xbt_dynar_t xbt_str_split(const char *s, const char *sep)
/*
* Diff related functions
+ *
+ * Implementation of the algorithm described in "An O(NP) Sequence Comparison
+ * Algorithm", by Sun Wu, Udi Manber, Gene Myers, and Webb Miller (Information
+ * Processing Letters 35(6):317-323, 1990), with the linear-space
+ * divide-and-conquer strategy described in "An O(ND) Difference Algorithm and
+ * Its Variations", by Eugene W. Myers (Algorithmica 1:251-266, 1986).
+ */
+
+struct subsequence {
+ int x, y; /* starting coordinates */
+ int len; /* length */
+};
+
+static XBT_INLINE
+void diff_snake(const char *vec_a[], int a0, int len_a,
+ const char *vec_b[], int b0, int len_b,
+ struct subsequence *seqs, int *fp, int k, int limit)
+{
+ int record_seq;
+ int x, y;
+ int fp_left = fp[k - 1] + 1;
+ int fp_right = fp[k + 1];
+ if (fp_left > fp_right) {
+ x = fp_left;
+ record_seq = k - 1;
+ } else {
+ x = fp_right;
+ record_seq = k + 1;
+ }
+ y = x - k;
+ if (x + y <= limit) {
+ seqs[k].x = x;
+ seqs[k].y = y;
+ record_seq = k;
+ } else {
+ seqs[k] = seqs[record_seq];
+ }
+ while (x < len_a && y < len_b && !strcmp(vec_a[a0 + x], vec_b[b0 + y]))
+ ++x, ++y;
+ fp[k] = x;
+ if (record_seq == k)
+ seqs[k].len = x - seqs[k].x;
+}
+
+/* Returns the length of a shortest edit script, and a common
+ * subsequence from the middle.
*/
-static XBT_INLINE int diff_get(xbt_matrix_t C, int i, int j)
+static int diff_middle_subsequence(const char *vec_a[], int a0, int len_a,
+ const char *vec_b[], int b0, int len_b,
+ struct subsequence *subseq,
+ struct subsequence *seqs, int *fp)
{
- return (i == -1 || j == -1) ? 0 : xbt_matrix_get_as(C, i, j, int);
+ const int delta = len_a - len_b;
+ const int limit = (len_a + len_b) / 2;
+ int kmin;
+ int kmax;
+ int k;
+ int p = -1;
+
+ if (delta >= 0) {
+ kmin = 0;
+ kmax = delta;
+ } else {
+ kmin = delta;
+ kmax = 0;
+ }
+ for (k = kmin; k <= kmax; k++)
+ fp[k] = -1;
+ do {
+ p++;
+ fp[kmin - p - 1] = fp[kmax + p + 1] = -1;
+ for (k = kmax + p; k > delta; k--)
+ diff_snake(vec_a, a0, len_a, vec_b, b0, len_b, seqs, fp, k, limit);
+ for (k = kmin - p; k <= delta; k++)
+ diff_snake(vec_a, a0, len_a, vec_b, b0, len_b, seqs, fp, k, limit);
+ } while (fp[delta] != len_a);
+
+ subseq->x = a0 + seqs[delta].x;
+ subseq->y = b0 + seqs[delta].y;
+ subseq->len = seqs[delta].len;
+ return abs(delta) + 2 * p;;
}
-static xbt_matrix_t diff_build_LCS(xbt_dynar_t da, xbt_dynar_t db)
+/* Finds a longest common subsequence.
+ * Returns its length.
+ */
+static int diff_compute_lcs(const char *vec_a[], int a0, int len_a,
+ const char *vec_b[], int b0, int len_b,
+ xbt_dynar_t common_sequence,
+ struct subsequence *seqs, int *fp)
{
- xbt_matrix_t C =
- xbt_matrix_new(xbt_dynar_length(da), xbt_dynar_length(db),
- sizeof(int), NULL);
- int i, j;
-
- /* Compute the LCS */
- /*
- function LCSLength(X[1..m], Y[1..n])
- C = array(0..m, 0..n)
- for i := 0..m
- C[i,0] = 0
- for j := 1..n
- C[0,j] = 0
- for i := 1..m
- for j := 1..n
- if X[i] = Y[j]
- C[i,j] := C[i-1,j-1] + 1
- else:
- C[i,j] := max(C[i,j-1], C[i-1,j])
- return C[m,n]
- */
- for (i = 0; i < (int)xbt_dynar_length(da); i++)
- for (j = 0; j < (int)xbt_dynar_length(db); j++) {
-
- if (!strcmp(xbt_dynar_get_as(da, i, char *),
- xbt_dynar_get_as(db, j, char *)))
- *((int *) xbt_matrix_get_ptr(C, i, j)) = diff_get(C, i - 1, j - 1) + 1;
- else
- *((int *) xbt_matrix_get_ptr(C, i, j)) = max(diff_get(C, i, j - 1),
- diff_get(C, i - 1, j));
+ if (len_a > 0 && len_b > 0) {
+ struct subsequence subseq;
+ int ses_len = diff_middle_subsequence(vec_a, a0, len_a, vec_b, b0, len_b,
+ &subseq, seqs, fp);
+ int lcs_len = (len_a + len_b - ses_len) / 2;
+ if (lcs_len == 0) {
+ return 0;
+ } else if (ses_len > 1) {
+ int lcs_len1 = subseq.len;
+ if (lcs_len1 < lcs_len)
+ lcs_len1 += diff_compute_lcs(vec_a, a0, subseq.x - a0,
+ vec_b, b0, subseq.y - b0,
+ common_sequence, seqs, fp);
+ if (subseq.len > 0)
+ xbt_dynar_push(common_sequence, &subseq);
+ if (lcs_len1 < lcs_len) {
+ int u = subseq.x + subseq.len;
+ int v = subseq.y + subseq.len;
+ diff_compute_lcs(vec_a, u, a0 + len_a - u, vec_b, v, b0 + len_b - v,
+ common_sequence, seqs, fp);
+ }
+ } else {
+ int len = MIN(len_a, len_b) - subseq.len;
+ if (subseq.x == a0 && subseq.y == b0) {
+ if (subseq.len > 0)
+ xbt_dynar_push(common_sequence, &subseq);
+ if (len > 0) {
+ struct subsequence subseq0 = {a0 + len_a - len,
+ b0 + len_b - len, len};
+ xbt_dynar_push(common_sequence, &subseq0);
+ }
+ } else {
+ if (len > 0) {
+ struct subsequence subseq0 = {a0, b0, len};
+ xbt_dynar_push(common_sequence, &subseq0);
+ }
+ if (subseq.len > 0)
+ xbt_dynar_push(common_sequence, &subseq);
+ }
}
- return C;
+ return lcs_len;
+ } else {
+ return 0;
+ }
}
-static void diff_build_diff(xbt_dynar_t res,
- xbt_matrix_t C,
- xbt_dynar_t da, xbt_dynar_t db, int i, int j)
+static int diff_member(const char *s, const char *vec[], int from, int to)
{
- char *topush;
- /* Construct the diff
- function printDiff(C[0..m,0..n], X[1..m], Y[1..n], i, j)
- if i > 0 and j > 0 and X[i] = Y[j]
- printDiff(C, X, Y, i-1, j-1)
- print " " + X[i]
- else
- if j > 0 and (i = 0 or C[i,j-1] >= C[i-1,j])
- printDiff(C, X, Y, i, j-1)
- print "+ " + Y[j]
- else if i > 0 and (j = 0 or C[i,j-1] < C[i-1,j])
- printDiff(C, X, Y, i-1, j)
- print "- " + X[i]
- */
-
- if (i >= 0 && j >= 0 && !strcmp(xbt_dynar_get_as(da, i, char *),
- xbt_dynar_get_as(db, j, char *))) {
- diff_build_diff(res, C, da, db, i - 1, j - 1);
- topush = bprintf(" %s", xbt_dynar_get_as(da, i, char *));
- xbt_dynar_push(res, &topush);
- } else if (j >= 0 &&
- (i == -1 || diff_get(C, i, j - 1) >= diff_get(C, i - 1, j))) {
- diff_build_diff(res, C, da, db, i, j - 1);
- topush = bprintf("+ %s", xbt_dynar_get_as(db, j, char *));
- xbt_dynar_push(res, &topush);
- } else if (i >= 0 &&
- (j == -1 || diff_get(C, i, j - 1) < diff_get(C, i - 1, j))) {
- diff_build_diff(res, C, da, db, i - 1, j);
- topush = bprintf("- %s", xbt_dynar_get_as(da, i, char *));
- xbt_dynar_push(res, &topush);
+ for ( ; from < to ; from++)
+ if (!strcmp(s, vec[from]))
+ return 1;
+ return 0;
+}
+
+/* Extract common prefix.
+ */
+static void diff_easy_prefix(const char *vec_a[], int *a0_p, int *len_a_p,
+ const char *vec_b[], int *b0_p, int *len_b_p,
+ xbt_dynar_t common_sequence)
+{
+ int a0 = *a0_p;
+ int b0 = *b0_p;
+ int len_a = *len_a_p;
+ int len_b = *len_b_p;
+
+ while (len_a > 0 && len_b > 0) {
+ struct subsequence subseq = {a0, b0, 0};
+ while (len_a > 0 && len_b > 0 && !strcmp(vec_a[a0], vec_b[b0])) {
+ a0++, len_a--;
+ b0++, len_b--;
+ subseq.len++;
+ }
+ if (subseq.len > 0)
+ xbt_dynar_push(common_sequence, &subseq);
+ if (len_a > 0 && len_b > 0 &&
+ !diff_member(vec_a[a0], vec_b, b0 + 1, b0 + len_b)) {
+ a0++, len_a--;
+ } else {
+ break;
+ }
+ }
+
+ *a0_p = a0;
+ *b0_p = b0;
+ *len_a_p = len_a;
+ *len_b_p = len_b;
+}
+
+/* Extract common suffix.
+ */
+static void diff_easy_suffix(const char *vec_a[], int *a0_p, int *len_a_p,
+ const char *vec_b[], int *b0_p, int *len_b_p,
+ xbt_dynar_t common_suffix)
+{
+ int a0 = *a0_p;
+ int b0 = *b0_p;
+ int len_a = *len_a_p;
+ int len_b = *len_b_p;
+
+ while (len_a > 0 && len_b > 0){
+ struct subsequence subseq;
+ subseq.len = 0;
+ while (len_a > 0 && len_b > 0 &&
+ !strcmp(vec_a[a0 + len_a - 1], vec_b[b0 + len_b - 1])) {
+ len_a--;
+ len_b--;
+ subseq.len++;
+ }
+ if (subseq.len > 0) {
+ subseq.x = a0 + len_a;
+ subseq.y = b0 + len_b;
+ xbt_dynar_push(common_suffix, &subseq);
+ }
+ if (len_a > 0 && len_b > 0 &&
+ !diff_member(vec_b[b0 + len_b - 1], vec_a, a0, a0 + len_a - 1)) {
+ len_b--;
+ } else {
+ break;
+ }
}
+
+ *a0_p = a0;
+ *b0_p = b0;
+ *len_a_p = len_a;
+ *len_b_p = len_b;
}
/** @brief Compute the unified diff of two strings */
{
xbt_dynar_t da = xbt_str_split(a, "\n");
xbt_dynar_t db = xbt_str_split(b, "\n");
- xbt_matrix_t C;
+ xbt_dynar_t common_sequence, common_suffix;
+ size_t len;
+ const char **vec_a, **vec_b;
+ int a0, b0;
+ int len_a, len_b;
+ int max;
+ int *fp_base, *fp;
+ struct subsequence *seqs_base, *seqs;
+ struct subsequence subseq;
xbt_dynar_t diff;
char *res;
- size_t len;
+ int x, y;
+ unsigned s;
/* Clean empty lines at the end of da and db */
len = strlen(a);
- if (len > 0 && a[len - 1] == '\n') {
- char *str;
- xbt_dynar_pop(da, &str);
- free(str);
- }
+ if (len > 0 && a[len - 1] == '\n')
+ xbt_dynar_pop(da, NULL);
len = strlen(b);
- if (len > 0 && b[len - 1] == '\n') {
- char *str;
- xbt_dynar_pop(db, &str);
- free(str);
+ if (len > 0 && b[len - 1] == '\n')
+ xbt_dynar_pop(db, NULL);
+
+ /* Various initializations */
+ /* Assume that dynar's content is contiguous */
+ a0 = 0;
+ len_a = xbt_dynar_length(da);
+ vec_a = len_a ? xbt_dynar_get_ptr(da, 0) : NULL;
+ b0 = 0;
+ len_b = xbt_dynar_length(db);
+ vec_b = len_b ? xbt_dynar_get_ptr(db, 0) : NULL;
+ max = MAX(len_a, len_b) + 1;
+ fp_base = xbt_new(int, 2 * max + 1);
+ fp = fp_base + max; /* indexes in [-max..max] */
+ seqs_base = xbt_new(struct subsequence, 2 * max + 1);
+ seqs = seqs_base + max; /* indexes in [-max..max] */
+ common_sequence = xbt_dynar_new(sizeof(struct subsequence), NULL);
+ common_suffix = xbt_dynar_new(sizeof(struct subsequence), NULL);
+
+ /* Add a sentinel a the end of the sequence */
+ subseq.x = len_a;
+ subseq.y = len_b;
+ subseq.len = 0;
+ xbt_dynar_push(common_suffix, &subseq);
+
+ /* Compute the Longest Common Subsequence */
+ diff_easy_prefix(vec_a, &a0, &len_a, vec_b, &b0, &len_b, common_sequence);
+ diff_easy_suffix(vec_a, &a0, &len_a, vec_b, &b0, &len_b, common_suffix);
+ diff_compute_lcs(vec_a, a0, len_a, vec_b, b0, len_b, common_sequence, seqs, fp);
+ while (!xbt_dynar_is_empty(common_suffix)) {
+ xbt_dynar_pop(common_suffix, &subseq);
+ xbt_dynar_push(common_sequence, &subseq);
}
- C = diff_build_LCS(da, db);
+ /* Build a Shortest Edit Script, and the final result */
diff = xbt_dynar_new(sizeof(char *), &xbt_free_ref);
-
- diff_build_diff(diff, C, da, db, xbt_dynar_length(da) - 1,
- xbt_dynar_length(db) - 1);
+ x = 0;
+ y = 0;
+ xbt_dynar_foreach(common_sequence, s, subseq) {
+ while (x < subseq.x) {
+ char *topush = bprintf("- %s", vec_a[x++]);
+ xbt_dynar_push_as(diff, char*, topush);
+ }
+ while (y < subseq.y) {
+ char *topush = bprintf("+ %s", vec_b[y++]);
+ xbt_dynar_push_as(diff, char*, topush);
+ }
+ while (x < subseq.x + subseq.len) {
+ char *topush = bprintf(" %s", vec_a[x++]);
+ xbt_dynar_push_as(diff, char*, topush);
+ y++;
+ }
+ }
res = xbt_str_join(diff, "\n");
- xbt_dynar_free(&da);
+ xbt_free(fp_base);
+ xbt_free(seqs_base);
xbt_dynar_free(&db);
+ xbt_dynar_free(&da);
+ xbt_dynar_free(&common_sequence);
+ xbt_dynar_free(&common_suffix);
xbt_dynar_free(&diff);
- xbt_matrix_free(C);
return res;
}
return res;
}
+/* @brief Retrun 1 if string 'str' starts with string 'start'
+ *
+ * \param str a string
+ * \param start the string to search in str
+ *
+ * \return 1 if 'str' starts with 'start'
+ */
+int xbt_str_start_with(const char* str, const char* start)
+{
+ int i;
+ size_t l_str = strlen(str);
+ size_t l_start = strlen(start);
+
+ if(l_start > l_str) return 0;
+
+ for(i = 0; i< l_start; i++){
+ if(str[i] != start[i]) return 0;
+ }
+
+ return 1;
+}
+
#ifdef SIMGRID_TEST
#include "xbt/str.h"