Match() uses 'matchString()' and 'matchWildcards()' and now works as expected
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xdrm-brackets
parent
d6a9411bb1
commit
c6112c9c74
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@ -1,6 +1,7 @@
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package parser
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import (
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"strings"
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"fmt"
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)
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@ -100,4 +101,115 @@ func (s Scheme) optimise() (Scheme, error) {
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return rshift, nil
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}
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// matchString checks the STRING matchers from an URI
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// it returns a boolean : false when not matching, true eitherway
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// it returns a cleared uri, without STRING data
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func (s Scheme) matchString(uri string) (string, bool) {
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/* (1) Initialise variables */
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clr := uri // contains cleared input string
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minOff := 0 // minimum offset
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/* (2) Iterate over strings */
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for _, m := range s {
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ls := len(m.pat)
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// {1} If not STRING matcher -> ignore //
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if ls == 0 { continue }
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// {2} Get offset in URI (else -1) //
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off := strings.Index(clr, m.pat)
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if off < 0 { return "", false }
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// {3} Fail on invalid offset range //
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if off < minOff { return "", false }
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// {4} Check for trailing '/' //
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hasSlash := 0
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if off+ls < len(clr) && clr[off+ls] == '/' {
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hasSlash = 1
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}
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// {5} Remove the current string (+trailing slash) from the URI //
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beg, end := clr[:off], clr[off+ls+hasSlash:]
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clr = fmt.Sprintf("%s\a/%s", beg, end) // separate matches by '\a' character
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// {6} Update offset range //
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minOff = len(beg) + 2 - 1 // +2 slash separators
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// -1 because strings begin with 1 slash already
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}
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/* (3) If exists, remove trailing '/' */
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if clr[len(clr)-1] == '/' {
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clr = clr[:len(clr)-1]
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}
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/* (4) If exists, remove trailing '\a' */
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if clr[len(clr)-1] == '\a' {
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clr = clr[:len(clr)-1]
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}
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return clr, true
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}
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// matchWildcards check the WILCARDS (non-string) matchers from
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// a cleared URI. it returns if the string matches
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// + it sets the matchers buffers for later extraction
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func (s Scheme) matchWildcards(clear string) bool {
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/* (1) Extract wildcards (ref) */
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wildcards := make(Scheme, 0, maxMatch)
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for _, m := range s {
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if len(m.pat) == 0 {
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m.buf = nil // flush buffers
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wildcards = append(wildcards, m)
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}
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}
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/* (2) If no wildcards -> match */
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if len(wildcards) == 0 {
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return true
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}
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/* (3) Break uri by '\a' characters */
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matches := strings.Split(clear, "\a")[1:]
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/* (4) Iterate over matches */
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for n, match := range matches {
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// {1} If no more matcher //
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if n >= len(wildcards) {
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return false
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}
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// {2} Split by '/' //
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data := strings.Split(match, "/")[1:] // from index 1 because it begins with '/'
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// {3} If required and missing //
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if wildcards[n].req && len(data) < 1 {
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return false
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}
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// {4} If not multi but got multi //
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if !wildcards[n].mul && len(data) > 1 {
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return false
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}
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// {5} Store data into matcher //
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wildcards[n].buf = data
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}
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/* (5) Match */
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return true
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}
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@ -47,94 +47,18 @@ func (s Scheme) Match(str string) bool {
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/* (1) Nothing -> match all */
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if len(s) == 0 { return true }
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/* (2) Init variables */
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wc := make(Scheme, 0, maxMatch) // conrains wildcards
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clr := str // contains cleared input string
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minOff := 0 // minimum offset
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/* (3) Iterate over strings */
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for _, m := range s {
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ls := len(m.pat)
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// if not string -> ignore
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if ls == 0 {
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wc = append(wc, m)
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continue
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}
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// get offset if contained, else -1
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off := strings.Index(clr, m.pat)
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if off < 0 { return false }
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// if invalid offset range -> fail
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if off < minOff { return false }
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// check if trailing '/'
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slash := 0
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if off+ls < len(clr) && clr[off+ls] == '/' {
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slash = 1
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}
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// exclude this string (+trailing slash if set)
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// fmt.Printf("remove: '%s'\n", clr[off:off+ls+slash])
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beg, end := clr[:off], clr[off+ls+slash:]
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clr = fmt.Sprintf("%s//%s", beg, end)
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// fmt.Printf("clr: '%s'\n", clr)
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// update offset range
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minOff = len(beg) + 2 - 1 // +2 slash separators
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// -1 because strings begin with 1 slash already
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}
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/* (4) If no wildcard -> match */
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if len(wc) == 0 {
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return true
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}
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// flush wildcard buffers
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for _, w := range wc { w.buf = nil }
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/* (5) Break the clear string apart */
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matches := strings.Split(clr, "//")[1:]
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// fail if missing matches
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if len(matches) < len(wc) {
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/* (2) Check for string match */
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clearURI, match := s.matchString(str)
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if !match {
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return false
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}
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nwc := 0
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for _, m := range matches {
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// ignore empty
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if len(m) == 0 { continue }
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// no matcher for this match
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if nwc >= len(wc){ return false }
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// split by '/'
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parts := strings.Split(m, "/")
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// if required and missing -> does not match
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if wc[nwc].req && len(parts) < 1 {
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return false
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}
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// if not multi but multi -> does not match
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if !wc[nwc].mul && len(parts) > 1 {
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return false
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}
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// store into wilcard matcher
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wc[nwc].buf = parts
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// increment wildcard count
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nwc++
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/* (3) Check for non-string match (wildcards) */
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match = s.matchWildcards(clearURI)
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if !match {
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return false
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}
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return true
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}
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