go mod vendor

vendor/gopkg.in/sourcemap.v1/sourcemap.go

@@ -0,0 +1,157 @@
+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,
+		})
+	}
+}