File: consumer.go

package info (click to toggle)
golang-gopkg-sourcemap.v1 1.0.5-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 128 kB
  • sloc: makefile: 6
file content (134 lines) | stat: -rw-r--r-- 2,396 bytes parent folder | download
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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
package sourcemap

import (
	"encoding/json"
	"fmt"
	"net/url"
	"path"
	"sort"
	"strconv"
)

type Consumer struct {
	sourceRootURL *url.URL
	smap          *sourceMap
	mappings      []mapping
}

func Parse(mapURL string, b []byte) (*Consumer, error) {
	smap := new(sourceMap)
	err := json.Unmarshal(b, smap)
	if err != nil {
		return nil, err
	}

	if smap.Version != 3 {
		return nil, fmt.Errorf(
			"sourcemap: got version=%d, but only 3rd version is supported",
			smap.Version,
		)
	}

	var sourceRootURL *url.URL
	if smap.SourceRoot != "" {
		u, err := url.Parse(smap.SourceRoot)
		if err != nil {
			return nil, err
		}
		if u.IsAbs() {
			sourceRootURL = u
		}
	} else if mapURL != "" {
		u, err := url.Parse(mapURL)
		if err != nil {
			return nil, err
		}
		if u.IsAbs() {
			u.Path = path.Dir(u.Path)
			sourceRootURL = u
		}
	}

	mappings, err := parseMappings(smap.Mappings)
	if err != nil {
		return nil, err
	}
	// Free memory.
	smap.Mappings = ""

	return &Consumer{
		sourceRootURL: sourceRootURL,
		smap:          smap,
		mappings:      mappings,
	}, nil
}

func (c *Consumer) File() string {
	return c.smap.File
}

func (c *Consumer) Source(genLine, genCol int) (source, name string, line, col int, ok bool) {
	i := sort.Search(len(c.mappings), func(i int) bool {
		m := &c.mappings[i]
		if m.genLine == genLine {
			return m.genCol >= genCol
		}
		return m.genLine >= genLine
	})

	// Mapping not found.
	if i == len(c.mappings) {
		return
	}

	match := &c.mappings[i]

	// Fuzzy match.
	if match.genLine > genLine || match.genCol > genCol {
		if i == 0 {
			return
		}
		match = &c.mappings[i-1]
	}

	if match.sourcesInd >= 0 {
		source = c.absSource(c.smap.Sources[match.sourcesInd])
	}
	if match.namesInd >= 0 {
		v := c.smap.Names[match.namesInd]
		switch v := v.(type) {
		case string:
			name = v
		case float64:
			name = strconv.FormatFloat(v, 'f', -1, 64)
		default:
			name = fmt.Sprint(v)
		}
	}
	line = match.sourceLine
	col = match.sourceCol
	ok = true
	return
}

func (c *Consumer) absSource(source string) string {
	if path.IsAbs(source) {
		return source
	}

	if u, err := url.Parse(source); err == nil && u.IsAbs() {
		return source
	}

	if c.sourceRootURL != nil {
		u := *c.sourceRootURL
		u.Path = path.Join(c.sourceRootURL.Path, source)
		return u.String()
	}

	if c.smap.SourceRoot != "" {
		return path.Join(c.smap.SourceRoot, source)
	}

	return source
}