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-rw-r--r--src/semver/semver.c640
1 files changed, 640 insertions, 0 deletions
diff --git a/src/semver/semver.c b/src/semver/semver.c
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+/*
+ * semver.c
+ *
+ * Copyright (c) 2015-2017 Tomas Aparicio
+ * MIT licensed
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "semver.h"
+
+#define SLICE_SIZE 50
+#define DELIMITER "."
+#define PR_DELIMITER "-"
+#define MT_DELIMITER "+"
+#define NUMBERS "0123456789"
+#define ALPHA "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+#define DELIMITERS DELIMITER PR_DELIMITER MT_DELIMITER
+#define VALID_CHARS NUMBERS ALPHA DELIMITERS
+
+static const size_t MAX_SIZE = sizeof(char) * 255;
+static const int MAX_SAFE_INT = (unsigned int) -1 >> 1;
+
+/**
+ * Define comparison operators, storing the
+ * ASCII code per each symbol in hexadecimal notation.
+ */
+
+enum operators {
+ SYMBOL_GT = 0x3e,
+ SYMBOL_LT = 0x3c,
+ SYMBOL_EQ = 0x3d,
+ SYMBOL_TF = 0x7e,
+ SYMBOL_CF = 0x5e
+};
+
+/**
+ * Private helpers
+ */
+
+/*
+ * Remove [begin:len-begin] from str by moving len data from begin+len to begin.
+ * If len is negative cut out to the end of the string.
+ */
+static int
+strcut (char *str, int begin, int len) {
+ size_t l;
+ l = strlen(str);
+
+ if((int)l < 0 || (int)l > MAX_SAFE_INT) return -1;
+
+ if (len < 0) len = l - begin + 1;
+ if (begin + len > (int)l) len = l - begin;
+ memmove(str + begin, str + begin + len, l - len + 1 - begin);
+
+ return len;
+}
+
+static int
+contains (const char c, const char *matrix, size_t len) {
+ size_t x;
+ for (x = 0; x < len; x++)
+ if ((char) matrix[x] == c) return 1;
+ return 0;
+}
+
+static int
+has_valid_chars (const char *str, const char *matrix) {
+ size_t i, len, mlen;
+ len = strlen(str);
+ mlen = strlen(matrix);
+
+ for (i = 0; i < len; i++)
+ if (contains(str[i], matrix, mlen) == 0)
+ return 0;
+
+ return 1;
+}
+
+static int
+binary_comparison (int x, int y) {
+ if (x == y) return 0;
+ if (x > y) return 1;
+ return -1;
+}
+
+static int
+parse_int (const char *s) {
+ int valid, num;
+ valid = has_valid_chars(s, NUMBERS);
+ if (valid == 0) return -1;
+
+ num = strtol(s, NULL, 10);
+ if (num > MAX_SAFE_INT) return -1;
+
+ return num;
+}
+
+/*
+ * Return a string allocated on the heap with the content from sep to end and
+ * terminate buf at sep.
+ */
+static char *
+parse_slice (char *buf, char sep) {
+ char *pr, *part;
+ int plen;
+
+ /* Find separator in buf */
+ pr = strchr(buf, sep);
+ if (pr == NULL) return NULL;
+ /* Length from separator to end of buf */
+ plen = strlen(pr);
+
+ /* Copy from buf into new string */
+ part = calloc(plen + 1, sizeof(*part));
+ if (part == NULL) return NULL;
+ memcpy(part, pr + 1, plen);
+ /* Null terminate new string */
+ part[plen] = '\0';
+
+ /* Terminate buf where separator was */
+ *pr = '\0';
+
+ return part;
+}
+
+/**
+ * Parses a string as semver expression.
+ *
+ * Returns:
+ *
+ * `0` - Parsed successfully
+ * `-1` - In case of error
+ */
+
+int
+semver_parse (const char *str, semver_t *ver) {
+ int valid, res;
+ size_t len;
+ char *buf;
+ valid = semver_is_valid(str);
+ if (!valid) return -1;
+
+ len = strlen(str);
+ buf = calloc(len + 1, sizeof(*buf));
+ if (buf == NULL) return -1;
+ strcpy(buf, str);
+
+ ver->metadata = parse_slice(buf, MT_DELIMITER[0]);
+ ver->prerelease = parse_slice(buf, PR_DELIMITER[0]);
+
+ res = semver_parse_version(buf, ver);
+ free(buf);
+#if DEBUG > 0
+ printf("[debug] semver.c %s = %d.%d.%d, %s %s\n", str, ver->major, ver->minor, ver->patch, ver->prerelease, ver->metadata);
+#endif
+ return res;
+}
+
+/**
+ * Parses a given string as semver expression.
+ *
+ * Returns:
+ *
+ * `0` - Parsed successfully
+ * `-1` - Parse error or invalid
+ */
+
+int
+semver_parse_version (const char *str, semver_t *ver) {
+ size_t len;
+ int index, value;
+ char *slice, *next, *endptr;
+ slice = (char *) str;
+ index = 0;
+
+ // non mandatory
+ ver->patch = 0;
+
+ while (slice != NULL && index++ < 4) {
+ next = strchr(slice, DELIMITER[0]);
+ if (next == NULL)
+ len = strlen(slice);
+ else
+ len = next - slice;
+ if (len > SLICE_SIZE) return -1;
+
+ /* Cast to integer and store */
+ value = strtol(slice, &endptr, 10);
+ if (endptr != next && *endptr != '\0') return -1;
+
+ switch (index) {
+ case 1: ver->major = value; break;
+ case 2: ver->minor = value; break;
+ case 3: ver->patch = value; break;
+ }
+
+ /* Continue with the next slice */
+ if (next == NULL)
+ slice = NULL;
+ else
+ slice = next + 1;
+ }
+
+ // Major and minor versions are mandatory, patch version is not mandatory.
+ return (index == 2 || index == 3) ? 0 : -1;
+}
+
+static int
+compare_prerelease (char *x, char *y) {
+ char *lastx, *lasty, *xptr, *yptr, *endptr;
+ int xlen, ylen, xisnum, yisnum, xnum, ynum;
+ int xn, yn, min, res;
+ if (x == NULL && y == NULL) return 0;
+ if (y == NULL && x) return -1;
+ if (x == NULL && y) return 1;
+
+ lastx = x;
+ lasty = y;
+ xlen = strlen(x);
+ ylen = strlen(y);
+
+ while (1) {
+ if ((xptr = strchr(lastx, DELIMITER[0])) == NULL)
+ xptr = x + xlen;
+ if ((yptr = strchr(lasty, DELIMITER[0])) == NULL)
+ yptr = y + ylen;
+
+ xnum = strtol(lastx, &endptr, 10);
+ xisnum = endptr == xptr ? 1 : 0;
+ ynum = strtol(lasty, &endptr, 10);
+ yisnum = endptr == yptr ? 1 : 0;
+
+ if (xisnum && !yisnum) return -1;
+ if (!xisnum && yisnum) return 1;
+
+ if (xisnum && yisnum) {
+ /* Numerical comparison */
+ if (xnum != ynum) return xnum < ynum ? -1 : 1;
+ } else {
+ /* String comparison */
+ xn = xptr - lastx;
+ yn = yptr - lasty;
+ min = xn < yn ? xn : yn;
+ if ((res = strncmp(lastx, lasty, min))) return res < 0 ? -1 : 1;
+ if (xn != yn) return xn < yn ? -1 : 1;
+ }
+
+ lastx = xptr + 1;
+ lasty = yptr + 1;
+ if (lastx == x + xlen + 1 && lasty == y + ylen + 1) break;
+ if (lastx == x + xlen + 1) return -1;
+ if (lasty == y + ylen + 1) return 1;
+ }
+
+ return 0;
+}
+
+int
+semver_compare_prerelease (semver_t x, semver_t y) {
+ return compare_prerelease(x.prerelease, y.prerelease);
+}
+
+/**
+ * Performs a major, minor and patch binary comparison (x, y).
+ * This function is mostly used internally
+ *
+ * Returns:
+ *
+ * `0` - If versiona are equal
+ * `1` - If x is higher than y
+ * `-1` - If x is lower than y
+ */
+
+int
+semver_compare_version (semver_t x, semver_t y) {
+ int res;
+
+ if ((res = binary_comparison(x.major, y.major)) == 0) {
+ if ((res = binary_comparison(x.minor, y.minor)) == 0) {
+ return binary_comparison(x.patch, y.patch);
+ }
+ }
+
+ return res;
+}
+
+/**
+ * Compare two semantic versions (x, y).
+ *
+ * Returns:
+ * - `1` if x is higher than y
+ * - `0` if x is equal to y
+ * - `-1` if x is lower than y
+ */
+
+int
+semver_compare (semver_t x, semver_t y) {
+ int res;
+
+ if ((res = semver_compare_version(x, y)) == 0) {
+ return semver_compare_prerelease(x, y);
+ }
+
+ return res;
+}
+
+/**
+ * Performs a `greater than` comparison
+ */
+
+int
+semver_gt (semver_t x, semver_t y) {
+ return semver_compare(x, y) == 1;
+}
+
+/**
+ * Performs a `lower than` comparison
+ */
+
+int
+semver_lt (semver_t x, semver_t y) {
+ return semver_compare(x, y) == -1;
+}
+
+/**
+ * Performs a `equality` comparison
+ */
+
+int
+semver_eq (semver_t x, semver_t y) {
+ return semver_compare(x, y) == 0;
+}
+
+/**
+ * Performs a `non equal to` comparison
+ */
+
+int
+semver_neq (semver_t x, semver_t y) {
+ return semver_compare(x, y) != 0;
+}
+
+/**
+ * Performs a `greater than or equal` comparison
+ */
+
+int
+semver_gte (semver_t x, semver_t y) {
+ return semver_compare(x, y) >= 0;
+}
+
+/**
+ * Performs a `lower than or equal` comparison
+ */
+
+int
+semver_lte (semver_t x, semver_t y) {
+ return semver_compare(x, y) <= 0;
+}
+
+/**
+ * Checks if version `x` can be satisfied by `y`
+ * performing a comparison with caret operator.
+ *
+ * See: https://docs.npmjs.com/misc/semver#caret-ranges-1-2-3-0-2-5-0-0-4
+ *
+ * Returns:
+ *
+ * `1` - Can be satisfied
+ * `0` - Cannot be satisfied
+ */
+
+int
+semver_satisfies_caret (semver_t x, semver_t y) {
+ if (x.major == y.major) {
+ if (x.major == 0) {
+ return x.minor >= y.minor;
+ }
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * Checks if version `x` can be satisfied by `y`
+ * performing a comparison with tilde operator.
+ *
+ * See: https://docs.npmjs.com/misc/semver#tilde-ranges-1-2-3-1-2-1
+ *
+ * Returns:
+ *
+ * `1` - Can be satisfied
+ * `0` - Cannot be satisfied
+ */
+
+int
+semver_satisfies_patch (semver_t x, semver_t y) {
+ return x.major == y.major
+ && x.minor == y.minor;
+}
+
+/**
+ * Checks if both versions can be satisfied
+ * based on the given comparison operator.
+ *
+ * Allowed operators:
+ *
+ * - `=` - Equality
+ * - `>=` - Higher or equal to
+ * - `<=` - Lower or equal to
+ * - `<` - Lower than
+ * - `>` - Higher than
+ * - `^` - Caret comparison (see https://docs.npmjs.com/misc/semver#caret-ranges-1-2-3-0-2-5-0-0-4)
+ * - `~` - Tilde comparison (see https://docs.npmjs.com/misc/semver#tilde-ranges-1-2-3-1-2-1)
+ *
+ * Returns:
+ *
+ * `1` - Can be satisfied
+ * `0` - Cannot be satisfied
+ */
+
+int
+semver_satisfies (semver_t x, semver_t y, const char *op) {
+ int first, second;
+ /* Extract the comparison operator */
+ first = op[0];
+ second = op[1];
+
+ /* Caret operator */
+ if (first == SYMBOL_CF)
+ return semver_satisfies_caret(x, y);
+
+ /* Tilde operator */
+ if (first == SYMBOL_TF)
+ return semver_satisfies_patch(x, y);
+
+ /* Strict equality */
+ if (first == SYMBOL_EQ)
+ return semver_eq(x, y);
+
+ /* Greater than or equal comparison */
+ if (first == SYMBOL_GT) {
+ if (second == SYMBOL_EQ) {
+ return semver_gte(x, y);
+ }
+ return semver_gt(x, y);
+ }
+
+ /* Lower than or equal comparison */
+ if (first == SYMBOL_LT) {
+ if (second == SYMBOL_EQ) {
+ return semver_lte(x, y);
+ }
+ return semver_lt(x, y);
+ }
+
+ return 0;
+}
+
+/**
+ * Free heep allocated memory of a given semver.
+ * This is just a convenient function that you
+ * should call when you're done.
+ */
+
+void
+semver_free (semver_t *x) {
+ if (x->metadata) {
+ free(x->metadata);
+ x->metadata = NULL;
+ }
+ if (x->prerelease) {
+ free(x->prerelease);
+ x->prerelease = NULL;
+ }
+}
+
+/**
+ * Renders
+ */
+
+static void
+concat_num (char * str, int x, char * sep) {
+ char buf[SLICE_SIZE] = {0};
+ if (sep == NULL) sprintf(buf, "%d", x);
+ else sprintf(buf, "%s%d", sep, x);
+ strcat(str, buf);
+}
+
+static void
+concat_char (char * str, char * x, char * sep) {
+ char buf[SLICE_SIZE] = {0};
+ sprintf(buf, "%s%s", sep, x);
+ strcat(str, buf);
+}
+
+/**
+ * Render a given semver as string
+ */
+
+void
+semver_render (semver_t *x, char *dest) {
+ if (x->major) concat_num(dest, x->major, NULL);
+ if (x->minor) concat_num(dest, x->minor, DELIMITER);
+ if (x->patch) concat_num(dest, x->patch, DELIMITER);
+ if (x->prerelease) concat_char(dest, x->prerelease, PR_DELIMITER);
+ if (x->metadata) concat_char(dest, x->metadata, MT_DELIMITER);
+}
+
+/**
+ * Version bump helpers
+ */
+
+void
+semver_bump (semver_t *x) {
+ x->major++;
+}
+
+void
+semver_bump_minor (semver_t *x) {
+ x->minor++;
+}
+
+void
+semver_bump_patch (semver_t *x) {
+ x->patch++;
+}
+
+/**
+ * Helpers
+ */
+
+static int
+has_valid_length (const char *s) {
+ return strlen(s) <= MAX_SIZE;
+}
+
+/**
+ * Checks if a given semver string is valid
+ *
+ * Returns:
+ *
+ * `1` - Valid expression
+ * `0` - Invalid
+ */
+
+int
+semver_is_valid (const char *s) {
+ return has_valid_length(s)
+ && has_valid_chars(s, VALID_CHARS);
+}
+
+/**
+ * Removes non-valid characters in the given string.
+ *
+ * Returns:
+ *
+ * `0` - Valid
+ * `-1` - Invalid input
+ */
+
+int
+semver_clean (char *s) {
+ size_t i, len, mlen;
+ int res;
+ if (has_valid_length(s) == 0) return -1;
+
+ len = strlen(s);
+ mlen = strlen(VALID_CHARS);
+
+ for (i = 0; i < len; i++) {
+ if (contains(s[i], VALID_CHARS, mlen) == 0) {
+ res = strcut(s, i, 1);
+ if(res == -1) return -1;
+ --len; --i;
+ }
+ }
+
+ return 0;
+}
+
+static int
+char_to_int (const char * str) {
+ int buf;
+ size_t i,len, mlen;
+ buf = 0;
+ len = strlen(str);
+ mlen = strlen(VALID_CHARS);
+
+ for (i = 0; i < len; i++)
+ if (contains(str[i], VALID_CHARS, mlen))
+ buf += (int) str[i];
+
+ return buf;
+}
+
+/**
+ * Render a given semver as numeric value.
+ * Useful for ordering and filtering.
+ */
+
+int
+semver_numeric (semver_t *x) {
+ int num;
+ char buf[SLICE_SIZE * 3];
+ memset(&buf, 0, SLICE_SIZE * 3);
+
+ if (x->major) concat_num(buf, x->major, NULL);
+ if (x->minor) concat_num(buf, x->minor, NULL);
+ if (x->patch) concat_num(buf, x->patch, NULL);
+
+ num = parse_int(buf);
+ if(num == -1) return -1;
+
+ if (x->prerelease) num += char_to_int(x->prerelease);
+ if (x->metadata) num += char_to_int(x->metadata);
+
+ return num;
+}
+
+char *semver_strdup(const char *src) {
+ if (src == NULL) return NULL;
+ size_t len = strlen(src) + 1;
+ char *res = malloc(len);
+ return res != NULL ? (char *) memcpy(res, src, len) : NULL;
+}
+
+semver_t
+semver_copy(const semver_t *ver) {
+ semver_t res = *ver;
+ if (ver->metadata != NULL) {
+ res.metadata = strdup(ver->metadata);
+ }
+ if (ver->prerelease != NULL) {
+ res.prerelease = strdup(ver->prerelease);
+ }
+ return res;
+}
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