src/pkg/go/doc/filter.go - The Go Programming Language

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Source file src/pkg/go/doc/filter.go

     1	// Copyright 2009 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	package doc
     6	
     7	import "go/ast"
     8	
     9	type Filter func(string) bool
    10	
    11	func matchFields(fields *ast.FieldList, f Filter) bool {
    12		if fields != nil {
    13			for _, field := range fields.List {
    14				for _, name := range field.Names {
    15					if f(name.Name) {
    16						return true
    17					}
    18				}
    19			}
    20		}
    21		return false
    22	}
    23	
    24	func matchDecl(d *ast.GenDecl, f Filter) bool {
    25		for _, d := range d.Specs {
    26			switch v := d.(type) {
    27			case *ast.ValueSpec:
    28				for _, name := range v.Names {
    29					if f(name.Name) {
    30						return true
    31					}
    32				}
    33			case *ast.TypeSpec:
    34				if f(v.Name.Name) {
    35					return true
    36				}
    37				switch t := v.Type.(type) {
    38				case *ast.StructType:
    39					if matchFields(t.Fields, f) {
    40						return true
    41					}
    42				case *ast.InterfaceType:
    43					if matchFields(t.Methods, f) {
    44						return true
    45					}
    46				}
    47			}
    48		}
    49		return false
    50	}
    51	
    52	func filterValues(a []*Value, f Filter) []*Value {
    53		w := 0
    54		for _, vd := range a {
    55			if matchDecl(vd.Decl, f) {
    56				a[w] = vd
    57				w++
    58			}
    59		}
    60		return a[0:w]
    61	}
    62	
    63	func filterFuncs(a []*Func, f Filter) []*Func {
    64		w := 0
    65		for _, fd := range a {
    66			if f(fd.Name) {
    67				a[w] = fd
    68				w++
    69			}
    70		}
    71		return a[0:w]
    72	}
    73	
    74	func filterTypes(a []*Type, f Filter) []*Type {
    75		w := 0
    76		for _, td := range a {
    77			n := 0 // number of matches
    78			if matchDecl(td.Decl, f) {
    79				n = 1
    80			} else {
    81				// type name doesn't match, but we may have matching consts, vars, factories or methods
    82				td.Consts = filterValues(td.Consts, f)
    83				td.Vars = filterValues(td.Vars, f)
    84				td.Funcs = filterFuncs(td.Funcs, f)
    85				td.Methods = filterFuncs(td.Methods, f)
    86				n += len(td.Consts) + len(td.Vars) + len(td.Funcs) + len(td.Methods)
    87			}
    88			if n > 0 {
    89				a[w] = td
    90				w++
    91			}
    92		}
    93		return a[0:w]
    94	}
    95	
    96	// Filter eliminates documentation for names that don't pass through the filter f.
    97	// TODO: Recognize "Type.Method" as a name.
    98	//
    99	func (p *Package) Filter(f Filter) {
   100		p.Consts = filterValues(p.Consts, f)
   101		p.Vars = filterValues(p.Vars, f)
   102		p.Types = filterTypes(p.Types, f)
   103		p.Funcs = filterFuncs(p.Funcs, f)
   104		p.Doc = "" // don't show top-level package doc
   105	}
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