query_test.go

Documentation: cuelang.org/go/cue

     1  // Copyright 2021 CUE Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package cue_test
    16  
    17  import (
    18  	"bytes"
    19  	"testing"
    20  
    21  	"cuelang.org/go/cue"
    22  	"cuelang.org/go/cue/cuecontext"
    23  	"cuelang.org/go/internal/cuetxtar"
    24  	"cuelang.org/go/internal/diff"
    25  	"golang.org/x/tools/txtar"
    26  )
    27  
    28  func TestLookupPath(t *testing.T) {
    29  	r := &cue.Runtime{}
    30  
    31  	testCases := []struct {
    32  		in   string
    33  		path cue.Path
    34  		out  string `test:"update"` // :nerdSnipe:
    35  		err  string `test:"update"` // :nerdSnipe:
    36  	}{{
    37  		in: `
    38  		#V: {
    39  			x: int
    40  		}
    41  		#X: {
    42  			[string]: int64
    43  		} & #V
    44  		v: #X
    45  		`,
    46  		path: cue.ParsePath("v.x"),
    47  		out:  `int64`,
    48  	}, {
    49  		in:   `#foo: 3`,
    50  		path: cue.ParsePath("#foo"),
    51  		out:  `3`,
    52  	}, {
    53  		in:   `_foo: 3`,
    54  		path: cue.MakePath(cue.Def("_foo")),
    55  		err:  `field not found: #_foo`,
    56  	}, {
    57  		in:   `_#foo: 3`,
    58  		path: cue.MakePath(cue.Def("_#foo")),
    59  		err:  `field not found: _#foo`,
    60  	}, {
    61  		in:   `"foo", #foo: 3`,
    62  		path: cue.ParsePath("#foo"),
    63  		out:  `3`,
    64  	}, {
    65  		in: `
    66  		a: [...int]
    67  		`,
    68  		path: cue.MakePath(cue.Str("a"), cue.AnyIndex),
    69  		out:  `int`,
    70  	}, {
    71  		in: `
    72  		[Name=string]: { a: Name }
    73  		`,
    74  		path: cue.MakePath(cue.AnyString, cue.Str("a")),
    75  		out:  `string`,
    76  	}, {
    77  		in: `
    78  		[Name=string]: { a: Name }
    79  		`,
    80  		path: cue.MakePath(cue.Str("b").Optional(), cue.Str("a")),
    81  		out:  `"b"`,
    82  	}, {
    83  		in: `
    84  		[Name=string]: { a: Name }
    85  		`,
    86  		path: cue.MakePath(cue.AnyString),
    87  		out:  `{a: string}`,
    88  	}, {
    89  		in: `
    90  		a: [Foo=string]: [Bar=string]: { b: Foo+Bar }
    91  		`,
    92  		path: cue.MakePath(cue.Str("a"), cue.Str("b"), cue.Str("c")).Optional(),
    93  		out:  `{b: "bc"}`,
    94  	}, {
    95  		in: `
    96  		a: [Foo=string]: b: [Bar=string]: { c: Foo }
    97  		a: foo: b: [Bar=string]: { d: Bar }
    98  		`,
    99  		path: cue.MakePath(cue.Str("a"), cue.Str("foo"), cue.Str("b"), cue.AnyString),
   100  		out:  `{c: "foo", d: string}`,
   101  	}, {
   102  		in: `
   103  		[Name=string]: { a: Name }
   104  		`,
   105  		path: cue.MakePath(cue.Str("a")),
   106  		err:  `field not found: a`,
   107  	}}
   108  	for _, tc := range testCases {
   109  		t.Run(tc.path.String(), func(t *testing.T) {
   110  			v := compileT(t, r, tc.in)
   111  
   112  			v = v.LookupPath(tc.path)
   113  
   114  			if err := v.Err(); err != nil || tc.err != "" {
   115  				if got := err.Error(); got != tc.err {
   116  					t.Errorf("error: got %v; want %v", got, tc.err)
   117  				}
   118  			}
   119  
   120  			if exists := v.Exists(); exists != (tc.err == "") {
   121  				t.Fatalf("exists: got %v; want: %v", exists, tc.err == "")
   122  			} else if !exists {
   123  				return
   124  			}
   125  
   126  			w := compileT(t, r, tc.out)
   127  
   128  			if k, d := diff.Diff(v, w); k != diff.Identity {
   129  				b := &bytes.Buffer{}
   130  				diff.Print(b, d)
   131  				t.Error(b)
   132  			}
   133  		})
   134  	}
   135  }
   136  
   137  func compileT(t *testing.T, r *cue.Runtime, s string) cue.Value {
   138  	t.Helper()
   139  	inst, err := r.Compile("", s)
   140  	if err != nil {
   141  		t.Fatal(err)
   142  	}
   143  	return inst.Value()
   144  }
   145  
   146  func TestHidden(t *testing.T) {
   147  	in := `
   148  -- cue.mod/module.cue --
   149  module: "mod.test"
   150  
   151  -- in.cue --
   152  import "mod.test/foo"
   153  
   154  a: foo.C
   155  b: _c
   156  _c: 2
   157  -- foo/foo.cue --
   158  package foo
   159  
   160  C: _d
   161  _d: 3
   162  		`
   163  
   164  	a := txtar.Parse([]byte(in))
   165  	instance := cuetxtar.Load(a, t.TempDir())[0]
   166  	if instance.Err != nil {
   167  		t.Fatal(instance.Err)
   168  	}
   169  
   170  	v := cuecontext.New().BuildInstance(instance)
   171  
   172  	testCases := []struct {
   173  		path cue.Path
   174  		pkg  string
   175  	}{{
   176  		path: cue.ParsePath("a"),
   177  		pkg:  "mod.test/foo",
   178  	}, {
   179  		path: cue.ParsePath("b"),
   180  		pkg:  "_",
   181  	}}
   182  	for _, tc := range testCases {
   183  		t.Run(tc.path.String(), func(t *testing.T) {
   184  			v := v.LookupPath(tc.path)
   185  			p := cue.Dereference(cue.Dereference(v)).Path().Selectors()
   186  			if got := p[len(p)-1].PkgPath(); got != tc.pkg {
   187  				t.Errorf("got %v; want %v", got, tc.pkg)
   188  			}
   189  		})
   190  	}
   191  }
   192
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