forked from mirror/gjson
Support subqueries
It's now possible to do a query like
topology.instances.#(service_roles.#(=="one"))#.service_version
On a JSON document such as
{
"topology": {
"instances": [{
"service_version": "1.2.3",
"service_roles": ["one", "two"]
},{
"service_version": "1.2.4",
"service_roles": ["three", "four"]
},{
"service_version": "1.2.2",
"service_roles": ["one"]
}]
}
}
Resulting in
["1.2.3","1.2.2"]
This commit is contained in:
tidwall
parent
90ca17622f
commit
1e964df7d9
138
gjson.go
138
gjson.go
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@ -736,14 +736,28 @@ func parseArrayPath(path string) (r arrayPathResult) {
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r.alogkey = path[2:]
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r.path = path[:1]
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} else if path[1] == '[' || path[1] == '(' {
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// query
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r.query.on = true
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if true {
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qpath, op, value, _, fi, ok := parseQuery(path[i:])
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if !ok {
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// bad query, end now
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break
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}
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r.query.path = qpath
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r.query.op = op
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r.query.value = value
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i = fi - 1
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if i+1 < len(path) && path[i+1] == '#' {
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r.query.all = true
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}
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} else {
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var end byte
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if path[1] == '[' {
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end = ']'
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} else {
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end = ')'
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}
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r.query.on = true
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// query
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i += 2
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// whitespace
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for ; i < len(path); i++ {
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@ -839,6 +853,7 @@ func parseArrayPath(path string) (r arrayPathResult) {
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}
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}
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}
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}
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continue
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}
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}
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@ -847,6 +862,115 @@ func parseArrayPath(path string) (r arrayPathResult) {
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return
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}
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// splitQuery takes a query and splits it into three parts:
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// path, op, middle, and right.
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// So for this query:
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// #(first_name=="Murphy").last
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// Becomes
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// first_name # path
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// =="Murphy" # middle
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// .last # right
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// Or,
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// #(service_roles.#(=="one")).cap
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// Becomes
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// service_roles.#(=="one") # path
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// # middle
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// .cap # right
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func parseQuery(query string) (
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path, op, value, remain string, i int, ok bool,
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) {
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if len(query) < 2 || query[0] != '#' ||
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(query[1] != '(' && query[1] != '[') {
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return "", "", "", "", i, false
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}
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i = 2
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j := 0 // start of value part
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depth := 1
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for ; i < len(query); i++ {
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if depth == 1 && j == 0 {
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switch query[i] {
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case '!', '=', '<', '>', '%':
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// start of the value part
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j = i
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continue
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}
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}
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if query[i] == '\\' {
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i++
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} else if query[i] == '[' || query[i] == '(' {
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depth++
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} else if query[i] == ']' || query[i] == ')' {
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depth--
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if depth == 0 {
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break
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}
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} else if query[i] == '"' {
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// inside selector string, balance quotes
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i++
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for ; i < len(query); i++ {
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if query[i] == '\\' {
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i++
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} else if query[i] == '"' {
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break
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}
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}
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}
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}
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if depth > 0 {
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return "", "", "", "", i, false
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}
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if j > 0 {
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path = trim(query[2:j])
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value = trim(query[j:i])
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remain = query[i+1:]
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// parse the compare op from the value
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var opsz int
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switch {
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case len(value) == 1:
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opsz = 1
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case value[0] == '!' && value[1] == '=':
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opsz = 2
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case value[0] == '!' && value[1] == '%':
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opsz = 2
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case value[0] == '<' && value[1] == '=':
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opsz = 2
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case value[0] == '>' && value[1] == '=':
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opsz = 2
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case value[0] == '=' && value[1] == '=':
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value = value[1:]
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opsz = 1
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case value[0] == '<':
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opsz = 1
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case value[0] == '>':
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opsz = 1
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case value[0] == '=':
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opsz = 1
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case value[0] == '%':
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opsz = 1
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}
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op = value[:opsz]
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value = trim(value[opsz:])
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} else {
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path = trim(query[2:i])
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remain = query[i+1:]
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}
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return path, op, value, remain, i + 1, true
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}
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func trim(s string) string {
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left:
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if len(s) > 0 && s[0] <= ' ' {
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s = s[1:]
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goto left
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}
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right:
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if len(s) > 0 && s[len(s)-1] <= ' ' {
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s = s[:len(s)-1]
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goto right
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}
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return s
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}
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type objectPathResult struct {
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part string
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path string
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@ -1135,6 +1259,16 @@ func queryMatches(rp *arrayPathResult, value Result) bool {
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if len(rpv) > 2 && rpv[0] == '"' && rpv[len(rpv)-1] == '"' {
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rpv = rpv[1 : len(rpv)-1]
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}
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if !value.Exists() {
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return false
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}
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if rp.query.op == "" {
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// the query is only looking for existence, such as:
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// friends.#(name)
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// which makes sure that the array "friends" has an element of
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// "name" that exists
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return true
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}
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switch value.Type {
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case String:
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switch rp.query.op {
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@ -1915,3 +1915,72 @@ func TestSubSelectors(t *testing.T) {
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func TestArrayCountRawOutput(t *testing.T) {
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assert(t, Get(`[1,2,3,4]`, "#").Raw == "4")
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}
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func TestParseQuery(t *testing.T) {
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var path, op, value, remain string
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var ok bool
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path, op, value, remain, _, ok =
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parseQuery(`#(service_roles.#(=="one").()==asdf).cap`)
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assert(t, ok &&
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path == `service_roles.#(=="one").()` &&
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op == "=" &&
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value == `asdf` &&
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remain == `.cap`)
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path, op, value, remain, _, ok = parseQuery(`#(first_name%"Murphy").last`)
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assert(t, ok &&
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path == `first_name` &&
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op == `%` &&
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value == `"Murphy"` &&
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remain == `.last`)
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path, op, value, remain, _, ok = parseQuery(`#( first_name !% "Murphy" ).last`)
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assert(t, ok &&
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path == `first_name` &&
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op == `!%` &&
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value == `"Murphy"` &&
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remain == `.last`)
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path, op, value, remain, _, ok = parseQuery(`#(service_roles.#(=="one"))`)
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assert(t, ok &&
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path == `service_roles.#(=="one")` &&
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op == `` &&
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value == `` &&
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remain == ``)
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path, op, value, remain, _, ok =
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parseQuery(`#(a\("\"(".#(=="o\"(ne")%"ab\")").remain`)
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assert(t, ok &&
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path == `a\("\"(".#(=="o\"(ne")` &&
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op == "%" &&
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value == `"ab\")"` &&
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remain == `.remain`)
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}
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func TestParentSubQuery(t *testing.T) {
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var json = `{
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"topology": {
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"instances": [
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{
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"service_version": "1.2.3",
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"service_locale": {"lang": "en"},
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"service_roles": ["one", "two"]
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},
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{
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"service_version": "1.2.4",
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"service_locale": {"lang": "th"},
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"service_roles": ["three", "four"]
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},
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{
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"service_version": "1.2.2",
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"service_locale": {"lang": "en"},
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"service_roles": ["one"]
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}
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]
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}
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}`
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res := Get(json, `topology.instances.#( service_roles.#(=="one"))#.service_version`)
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// should return two instances
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assert(t, res.String() == `["1.2.3","1.2.2"]`)
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}
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