build.go

Documentation: cuelang.org/go/internal/core/runtime

     1  // Copyright 2020 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 runtime
    16  
    17  import (
    18  	"strings"
    19  
    20  	"cuelang.org/go/cue/ast"
    21  	"cuelang.org/go/cue/ast/astutil"
    22  	"cuelang.org/go/cue/build"
    23  	"cuelang.org/go/cue/errors"
    24  	"cuelang.org/go/cue/stats"
    25  	"cuelang.org/go/cue/token"
    26  	"cuelang.org/go/internal"
    27  	"cuelang.org/go/internal/core/adt"
    28  	"cuelang.org/go/internal/core/compile"
    29  )
    30  
    31  type Config struct {
    32  	Runtime    *Runtime
    33  	Filename   string
    34  	ImportPath string
    35  
    36  	Counts *stats.Counts
    37  
    38  	compile.Config
    39  }
    40  
    41  // Build builds b and all its transitive dependencies, insofar they have not
    42  // been build yet.
    43  func (x *Runtime) Build(cfg *Config, b *build.Instance) (v *adt.Vertex, errs errors.Error) {
    44  	if err := b.Complete(); err != nil {
    45  		return nil, b.Err
    46  	}
    47  	if v := x.getNodeFromInstance(b); v != nil {
    48  		return v, b.Err
    49  	}
    50  	// TODO: clear cache of old implementation.
    51  	// if s := b.ImportPath; s != "" {
    52  	// 	// Use cached result, if available.
    53  	// 	if v, err := x.LoadImport(s); v != nil || err != nil {
    54  	// 		return v, err
    55  	// 	}
    56  	// }
    57  
    58  	errs = b.Err
    59  
    60  	// Build transitive dependencies.
    61  	for _, file := range b.Files {
    62  		file.VisitImports(func(d *ast.ImportDecl) {
    63  			for _, s := range d.Specs {
    64  				errs = errors.Append(errs, x.buildSpec(cfg, b, s))
    65  			}
    66  		})
    67  	}
    68  
    69  	err := x.ResolveFiles(b)
    70  	errs = errors.Append(errs, err)
    71  
    72  	var cc *compile.Config
    73  	if cfg != nil {
    74  		cc = &cfg.Config
    75  	}
    76  	if cfg != nil && cfg.ImportPath != "" {
    77  		b.ImportPath = cfg.ImportPath
    78  		b.PkgName = astutil.ImportPathName(b.ImportPath)
    79  	}
    80  	v, err = compile.Files(cc, x, b.ID(), b.Files...)
    81  	errs = errors.Append(errs, err)
    82  
    83  	errs = errors.Append(errs, x.injectImplementations(b, v))
    84  
    85  	if errs != nil {
    86  		v = adt.ToVertex(&adt.Bottom{Err: errs})
    87  		b.Err = errs
    88  	}
    89  
    90  	x.AddInst(b.ImportPath, v, b)
    91  
    92  	return v, errs
    93  }
    94  
    95  func dummyLoad(token.Pos, string) *build.Instance { return nil }
    96  
    97  func (r *Runtime) Compile(cfg *Config, source interface{}) (*adt.Vertex, *build.Instance) {
    98  	ctx := build.NewContext()
    99  	var filename string
   100  	if cfg != nil && cfg.Filename != "" {
   101  		filename = cfg.Filename
   102  	}
   103  	p := ctx.NewInstance(filename, dummyLoad)
   104  	if err := p.AddFile(filename, source); err != nil {
   105  		return nil, p
   106  	}
   107  	v, _ := r.Build(cfg, p)
   108  	return v, p
   109  }
   110  
   111  func (r *Runtime) CompileFile(cfg *Config, file *ast.File) (*adt.Vertex, *build.Instance) {
   112  	ctx := build.NewContext()
   113  	filename := file.Filename
   114  	if cfg != nil && cfg.Filename != "" {
   115  		filename = cfg.Filename
   116  	}
   117  	p := ctx.NewInstance(filename, dummyLoad)
   118  	err := p.AddSyntax(file)
   119  	if err != nil {
   120  		return nil, p
   121  	}
   122  	_, p.PkgName, _ = internal.PackageInfo(file)
   123  	v, _ := r.Build(cfg, p)
   124  	return v, p
   125  }
   126  
   127  func (x *Runtime) buildSpec(cfg *Config, b *build.Instance, spec *ast.ImportSpec) (errs errors.Error) {
   128  	info, err := astutil.ParseImportSpec(spec)
   129  	if err != nil {
   130  		return errors.Promote(err, "invalid import path")
   131  	}
   132  
   133  	pkg := b.LookupImport(info.ID)
   134  	if pkg == nil {
   135  		if strings.Contains(info.ID, ".") {
   136  			return errors.Newf(spec.Pos(),
   137  				"package %q imported but not defined in %s",
   138  				info.ID, b.ImportPath)
   139  		} else if x.index.builtinPaths[info.ID] == nil {
   140  			return errors.Newf(spec.Pos(),
   141  				"builtin package %q undefined", info.ID)
   142  		}
   143  		return nil
   144  	}
   145  
   146  	if v := x.getNodeFromInstance(pkg); v != nil {
   147  		return pkg.Err
   148  	}
   149  
   150  	if _, err := x.Build(cfg, pkg); err != nil {
   151  		return err
   152  	}
   153  
   154  	return nil
   155  }
   156
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