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|
package sourcemap // import "gopkg.in/sourcemap.v1"
import (
"io"
"strings"
"gopkg.in/sourcemap.v1/base64vlq"
)
type fn func(m *mappings) (fn, error)
type sourceMap struct {
Version int `json:"version"`
File string `json:"file"`
SourceRoot string `json:"sourceRoot"`
Sources []string `json:"sources"`
Names []interface{} `json:"names"`
Mappings string `json:"mappings"`
}
type mapping struct {
genLine int
genCol int
sourcesInd int
sourceLine int
sourceCol int
namesInd int
}
type mappings struct {
rd *strings.Reader
dec *base64vlq.Decoder
hasName bool
value mapping
values []mapping
}
func parseMappings(s string) ([]mapping, error) {
rd := strings.NewReader(s)
m := &mappings{
rd: rd,
dec: base64vlq.NewDecoder(rd),
}
m.value.genLine = 1
m.value.sourceLine = 1
err := m.parse()
if err != nil {
return nil, err
}
return m.values, nil
}
func (m *mappings) parse() error {
next := parseGenCol
for {
c, err := m.rd.ReadByte()
if err == io.EOF {
m.pushValue()
return nil
}
if err != nil {
return err
}
switch c {
case ',':
m.pushValue()
next = parseGenCol
case ';':
m.pushValue()
m.value.genLine++
m.value.genCol = 0
next = parseGenCol
default:
err := m.rd.UnreadByte()
if err != nil {
return err
}
next, err = next(m)
if err != nil {
return err
}
}
}
}
func parseGenCol(m *mappings) (fn, error) {
n, err := m.dec.Decode()
if err != nil {
return nil, err
}
m.value.genCol += n
return parseSourcesInd, nil
}
func parseSourcesInd(m *mappings) (fn, error) {
n, err := m.dec.Decode()
if err != nil {
return nil, err
}
m.value.sourcesInd += n
return parseSourceLine, nil
}
func parseSourceLine(m *mappings) (fn, error) {
n, err := m.dec.Decode()
if err != nil {
return nil, err
}
m.value.sourceLine += n
return parseSourceCol, nil
}
func parseSourceCol(m *mappings) (fn, error) {
n, err := m.dec.Decode()
if err != nil {
return nil, err
}
m.value.sourceCol += n
return parseNamesInd, nil
}
func parseNamesInd(m *mappings) (fn, error) {
n, err := m.dec.Decode()
if err != nil {
return nil, err
}
m.hasName = true
m.value.namesInd += n
return parseGenCol, nil
}
func (m *mappings) pushValue() {
if m.value.sourceLine == 1 && m.value.sourceCol == 0 {
return
}
if m.hasName {
m.values = append(m.values, m.value)
m.hasName = false
} else {
m.values = append(m.values, mapping{
genLine: m.value.genLine,
genCol: m.value.genCol,
sourcesInd: m.value.sourcesInd,
sourceLine: m.value.sourceLine,
sourceCol: m.value.sourceCol,
namesInd: -1,
})
}
}
|
