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|
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
}
|
