/usr/share/gocode/src/github.com/alecthomas/chroma/remap.go is in golang-github-alecthomas-chroma-dev 0.4.0+git20180402.51d250f-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 | package chroma
type remappingLexer struct {
lexer Lexer
mapper func(*Token) []*Token
}
// RemappingLexer remaps a token to a set of, potentially empty, tokens.
func RemappingLexer(lexer Lexer, mapper func(*Token) []*Token) Lexer {
return &remappingLexer{lexer, mapper}
}
func (r *remappingLexer) Config() *Config {
return r.lexer.Config()
}
func (r *remappingLexer) Tokenise(options *TokeniseOptions, text string) (Iterator, error) {
it, err := r.lexer.Tokenise(options, text)
if err != nil {
return nil, err
}
buffer := []*Token{}
return func() *Token {
for {
if len(buffer) > 0 {
t := buffer[0]
buffer = buffer[1:]
return t
}
t := it()
if t == nil {
return t
}
buffer = r.mapper(t)
}
}, nil
}
type TypeMapping []struct {
From, To TokenType
Words []string
}
// TypeRemappingLexer remaps types of tokens coming from a parent Lexer.
//
// eg. Map "defvaralias" tokens of type NameVariable to NameFunction:
//
// mapping := TypeMapping{
// {NameVariable, NameFunction, []string{"defvaralias"},
// }
// lexer = TypeRemappingLexer(lexer, mapping)
func TypeRemappingLexer(lexer Lexer, mapping TypeMapping) Lexer {
// Lookup table for fast remapping.
lut := map[TokenType]map[string]TokenType{}
for _, rt := range mapping {
km, ok := lut[rt.From]
if !ok {
km = map[string]TokenType{}
lut[rt.From] = km
}
if len(rt.Words) == 0 {
km[""] = rt.To
} else {
for _, k := range rt.Words {
km[k] = rt.To
}
}
}
return RemappingLexer(lexer, func(t *Token) []*Token {
if k, ok := lut[t.Type]; ok {
if tt, ok := k[t.Value]; ok {
t.Type = tt
} else if tt, ok := k[""]; ok {
t.Type = tt
}
}
return []*Token{t}
})
}
|