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|
package sourcemap
import (
"errors"
"io"
"strings"
"github.com/go-sourcemap/sourcemap/internal/base64vlq"
)
type fn func(m *mappings) (fn, error)
type mapping struct {
genLine int32
genColumn int32
sourcesInd int32
sourceLine int32
sourceColumn int32
namesInd int32
}
type mappings struct {
rd *strings.Reader
dec base64vlq.Decoder
hasName bool
value mapping
values []mapping
}
func parseMappings(s string) ([]mapping, error) {
if s == "" {
return nil, errors.New("sourcemap: mappings are empty")
}
rd := strings.NewReader(s)
m := &mappings{
rd: rd,
dec: base64vlq.NewDecoder(rd),
values: make([]mapping, 0, mappingsNumber(s)),
}
m.value.genLine = 1
m.value.sourceLine = 1
err := m.parse()
if err != nil {
return nil, err
}
values := m.values
m.values = nil
return values, nil
}
func mappingsNumber(s string) int {
return strings.Count(s, ",") + strings.Count(s, ";")
}
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.genColumn = 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.genColumn += 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.sourceColumn += 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.sourceColumn == 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,
genColumn: m.value.genColumn,
sourcesInd: m.value.sourcesInd,
sourceLine: m.value.sourceLine,
sourceColumn: m.value.sourceColumn,
namesInd: -1,
})
}
}
|
