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- Added the `jp.PathMatch` function that compares a normalized JSONPath with a target JSONPath. - Added `jp.MatchHandler` a TokenHandler that can be used to build a path and data while processing a JSON document. - Added `oj.Match` and `sen.Match` functions.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| // Copyright (c) 2024, Peter Ohler, All rights reserved. | ||
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| package jp | ||
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| // PathMatch returns true if the provided path would match the target | ||
| // expression. The path argument is expected to be a normalized path with only | ||
| // elements of Root ($), At (@), Child (string), or Nth (int). A Filter | ||
| // fragment in the target expression will match any value in path since it | ||
| // requires data from a JSON document to be evaluated. Slice fragments always | ||
| // return true as long as the path element is an Nth. | ||
| func PathMatch(target, path Expr) bool { | ||
| if 0 < len(target) { | ||
| switch target[0].(type) { | ||
| case Root, At: | ||
| target = target[1:] | ||
| } | ||
| } | ||
| if 0 < len(path) { | ||
| switch path[0].(type) { | ||
| case Root, At: | ||
| path = path[1:] | ||
| } | ||
| } | ||
| for i, f := range target { | ||
| if len(path) == 0 { | ||
| return false | ||
| } | ||
| switch path[0].(type) { | ||
| case Child, Nth: | ||
| default: | ||
| return false | ||
| } | ||
| switch tf := f.(type) { | ||
| case Child, Nth: | ||
| if tf != path[0] { | ||
| return false | ||
| } | ||
| path = path[1:] | ||
| case Bracket: | ||
| // ignore and don't advance path | ||
| case Wildcard: | ||
| path = path[1:] | ||
| case Union: | ||
| var ok bool | ||
| for _, u := range tf { | ||
| check: | ||
| switch tu := u.(type) { | ||
| case string: | ||
| if Child(tu) == path[0] { | ||
| ok = true | ||
| break check | ||
| } | ||
| case int64: | ||
| if Nth(tu) == path[0] { | ||
| ok = true | ||
| break check | ||
| } | ||
| } | ||
| } | ||
| if !ok { | ||
| return false | ||
| } | ||
| path = path[1:] | ||
| case Slice: | ||
| if _, ok := path[0].(Nth); !ok { | ||
| return false | ||
| } | ||
| path = path[1:] | ||
| case *Filter: | ||
| // Assume a match since there is no data for comparison. | ||
| path = path[1:] | ||
| case Descent: | ||
| rest := target[i+1:] | ||
| for 0 < len(path) { | ||
| if PathMatch(rest, path) { | ||
| return true | ||
| } | ||
| path = path[1:] | ||
| } | ||
| return false | ||
| default: | ||
| return false | ||
| } | ||
| } | ||
| return true | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,56 @@ | ||
| // copyright (c) 2024, Peter Ohler, All rights reserved. | ||
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| package jp_test | ||
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| import ( | ||
| "testing" | ||
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| "github.com/ohler55/ojg/jp" | ||
| "github.com/ohler55/ojg/tt" | ||
| ) | ||
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| type matchData struct { | ||
| target string | ||
| path string | ||
| expect bool | ||
| } | ||
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| func TestPathMatchCheck(t *testing.T) { | ||
| for i, md := range []*matchData{ | ||
| {target: "$.a", path: "a", expect: true}, | ||
| {target: "@.a", path: "a", expect: true}, | ||
| {target: "a", path: "a", expect: true}, | ||
| {target: "a", path: "$.a", expect: true}, | ||
| {target: "a", path: "@.a", expect: true}, | ||
| {target: "[1]", path: "[1]", expect: true}, | ||
| {target: "[1]", path: "[0]", expect: false}, | ||
| {target: "*", path: "[1]", expect: true}, | ||
| {target: "[*]", path: "[1]", expect: true}, | ||
| {target: "*", path: "a", expect: true}, | ||
| {target: "[1,'a']", path: "a", expect: true}, | ||
| {target: "[1,'a']", path: "[1]", expect: true}, | ||
| {target: "[1,'a']", path: "b", expect: false}, | ||
| {target: "[1,'a']", path: "[0]", expect: false}, | ||
| {target: "$.x[1,'a']", path: "x[1]", expect: true}, | ||
| {target: "..x", path: "a.b.x", expect: true}, | ||
| {target: "..x", path: "a.b.c", expect: false}, | ||
| {target: "x[1:5:2]", path: "x[2]", expect: true}, | ||
| {target: "x[1:5:2]", path: "x.y", expect: false}, | ||
| {target: "x[[email protected] == 2]", path: "x[2]", expect: true}, | ||
| {target: "x.y.z", path: "x.y", expect: false}, | ||
| } { | ||
| tt.Equal(t, md.expect, jp.PathMatch(jp.MustParseString(md.target), jp.MustParseString(md.path)), | ||
| "%d: %s %s", i, md.target, md.path) | ||
| } | ||
| } | ||
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| func TestPathMatchDoubleRoot(t *testing.T) { | ||
| tt.Equal(t, false, jp.PathMatch(jp.R().R().C("a"), jp.C("a"))) | ||
| tt.Equal(t, false, jp.PathMatch(jp.A().A().C("a"), jp.C("a"))) | ||
| tt.Equal(t, false, jp.PathMatch(jp.C("a"), jp.R().R().C("a"))) | ||
| tt.Equal(t, false, jp.PathMatch(jp.C("a"), jp.A().A().C("a"))) | ||
| } | ||
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| func TestPathMatchSkipBracket(t *testing.T) { | ||
| tt.Equal(t, true, jp.PathMatch(jp.B().C("a"), jp.C("a"))) | ||
| } |
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