github.com/cockroachdb/cockroachdb-parser@v0.23.3-0.20240213214944-911057d40c9a/pkg/sql/colexec/execgen/execgen.go (about)

     1  // Copyright 2020 The Cockroach Authors.
     2  //
     3  // Use of this software is governed by the Business Source License
     4  // included in the file licenses/BSL.txt.
     5  //
     6  // As of the Change Date specified in that file, in accordance with
     7  // the Business Source License, use of this software will be governed
     8  // by the Apache License, Version 2.0, included in the file
     9  // licenses/APL.txt.
    10  
    11  package execgen
    12  
    13  import (
    14  	"go/parser"
    15  	"go/token"
    16  	"strings"
    17  
    18  	"github.com/dave/dst/decorator"
    19  )
    20  
    21  // Generate transforms the string contents of an input execgen template by
    22  // processing all supported // execgen annotations.
    23  func Generate(inputFileContents string) (string, error) {
    24  	f, err := decorator.ParseFile(token.NewFileSet(), "", inputFileContents, parser.ParseComments)
    25  	if err != nil {
    26  		return "", err
    27  	}
    28  
    29  	// Generate template variants: // execgen:template
    30  	expandTemplates(f)
    31  
    32  	// Inline functions: // execgen:inline
    33  	inlineFuncs(f)
    34  
    35  	// Produce output string.
    36  	var sb strings.Builder
    37  	if err := decorator.Fprint(&sb, f); err != nil {
    38  		panic(err)
    39  	}
    40  	return sb.String(), nil
    41  }