forked from Shiloh/githaven
9fe4437bda
* Use vendored go-swagger * vendor go-swagger * revert un wanteed change * remove un-needed GO111MODULE * Update Makefile Co-Authored-By: techknowlogick <matti@mdranta.net>
1183 lines
23 KiB
Go
Vendored
1183 lines
23 KiB
Go
Vendored
// Package jlexer contains a JSON lexer implementation.
|
|
//
|
|
// It is expected that it is mostly used with generated parser code, so the interface is tuned
|
|
// for a parser that knows what kind of data is expected.
|
|
package jlexer
|
|
|
|
import (
|
|
"encoding/base64"
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"strconv"
|
|
"unicode"
|
|
"unicode/utf16"
|
|
"unicode/utf8"
|
|
)
|
|
|
|
// tokenKind determines type of a token.
|
|
type tokenKind byte
|
|
|
|
const (
|
|
tokenUndef tokenKind = iota // No token.
|
|
tokenDelim // Delimiter: one of '{', '}', '[' or ']'.
|
|
tokenString // A string literal, e.g. "abc\u1234"
|
|
tokenNumber // Number literal, e.g. 1.5e5
|
|
tokenBool // Boolean literal: true or false.
|
|
tokenNull // null keyword.
|
|
)
|
|
|
|
// token describes a single token: type, position in the input and value.
|
|
type token struct {
|
|
kind tokenKind // Type of a token.
|
|
|
|
boolValue bool // Value if a boolean literal token.
|
|
byteValue []byte // Raw value of a token.
|
|
delimValue byte
|
|
}
|
|
|
|
// Lexer is a JSON lexer: it iterates over JSON tokens in a byte slice.
|
|
type Lexer struct {
|
|
Data []byte // Input data given to the lexer.
|
|
|
|
start int // Start of the current token.
|
|
pos int // Current unscanned position in the input stream.
|
|
token token // Last scanned token, if token.kind != tokenUndef.
|
|
|
|
firstElement bool // Whether current element is the first in array or an object.
|
|
wantSep byte // A comma or a colon character, which need to occur before a token.
|
|
|
|
UseMultipleErrors bool // If we want to use multiple errors.
|
|
fatalError error // Fatal error occurred during lexing. It is usually a syntax error.
|
|
multipleErrors []*LexerError // Semantic errors occurred during lexing. Marshalling will be continued after finding this errors.
|
|
}
|
|
|
|
// FetchToken scans the input for the next token.
|
|
func (r *Lexer) FetchToken() {
|
|
r.token.kind = tokenUndef
|
|
r.start = r.pos
|
|
|
|
// Check if r.Data has r.pos element
|
|
// If it doesn't, it mean corrupted input data
|
|
if len(r.Data) < r.pos {
|
|
r.errParse("Unexpected end of data")
|
|
return
|
|
}
|
|
// Determine the type of a token by skipping whitespace and reading the
|
|
// first character.
|
|
for _, c := range r.Data[r.pos:] {
|
|
switch c {
|
|
case ':', ',':
|
|
if r.wantSep == c {
|
|
r.pos++
|
|
r.start++
|
|
r.wantSep = 0
|
|
} else {
|
|
r.errSyntax()
|
|
}
|
|
|
|
case ' ', '\t', '\r', '\n':
|
|
r.pos++
|
|
r.start++
|
|
|
|
case '"':
|
|
if r.wantSep != 0 {
|
|
r.errSyntax()
|
|
}
|
|
|
|
r.token.kind = tokenString
|
|
r.fetchString()
|
|
return
|
|
|
|
case '{', '[':
|
|
if r.wantSep != 0 {
|
|
r.errSyntax()
|
|
}
|
|
r.firstElement = true
|
|
r.token.kind = tokenDelim
|
|
r.token.delimValue = r.Data[r.pos]
|
|
r.pos++
|
|
return
|
|
|
|
case '}', ']':
|
|
if !r.firstElement && (r.wantSep != ',') {
|
|
r.errSyntax()
|
|
}
|
|
r.wantSep = 0
|
|
r.token.kind = tokenDelim
|
|
r.token.delimValue = r.Data[r.pos]
|
|
r.pos++
|
|
return
|
|
|
|
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-':
|
|
if r.wantSep != 0 {
|
|
r.errSyntax()
|
|
}
|
|
r.token.kind = tokenNumber
|
|
r.fetchNumber()
|
|
return
|
|
|
|
case 'n':
|
|
if r.wantSep != 0 {
|
|
r.errSyntax()
|
|
}
|
|
|
|
r.token.kind = tokenNull
|
|
r.fetchNull()
|
|
return
|
|
|
|
case 't':
|
|
if r.wantSep != 0 {
|
|
r.errSyntax()
|
|
}
|
|
|
|
r.token.kind = tokenBool
|
|
r.token.boolValue = true
|
|
r.fetchTrue()
|
|
return
|
|
|
|
case 'f':
|
|
if r.wantSep != 0 {
|
|
r.errSyntax()
|
|
}
|
|
|
|
r.token.kind = tokenBool
|
|
r.token.boolValue = false
|
|
r.fetchFalse()
|
|
return
|
|
|
|
default:
|
|
r.errSyntax()
|
|
return
|
|
}
|
|
}
|
|
r.fatalError = io.EOF
|
|
return
|
|
}
|
|
|
|
// isTokenEnd returns true if the char can follow a non-delimiter token
|
|
func isTokenEnd(c byte) bool {
|
|
return c == ' ' || c == '\t' || c == '\r' || c == '\n' || c == '[' || c == ']' || c == '{' || c == '}' || c == ',' || c == ':'
|
|
}
|
|
|
|
// fetchNull fetches and checks remaining bytes of null keyword.
|
|
func (r *Lexer) fetchNull() {
|
|
r.pos += 4
|
|
if r.pos > len(r.Data) ||
|
|
r.Data[r.pos-3] != 'u' ||
|
|
r.Data[r.pos-2] != 'l' ||
|
|
r.Data[r.pos-1] != 'l' ||
|
|
(r.pos != len(r.Data) && !isTokenEnd(r.Data[r.pos])) {
|
|
|
|
r.pos -= 4
|
|
r.errSyntax()
|
|
}
|
|
}
|
|
|
|
// fetchTrue fetches and checks remaining bytes of true keyword.
|
|
func (r *Lexer) fetchTrue() {
|
|
r.pos += 4
|
|
if r.pos > len(r.Data) ||
|
|
r.Data[r.pos-3] != 'r' ||
|
|
r.Data[r.pos-2] != 'u' ||
|
|
r.Data[r.pos-1] != 'e' ||
|
|
(r.pos != len(r.Data) && !isTokenEnd(r.Data[r.pos])) {
|
|
|
|
r.pos -= 4
|
|
r.errSyntax()
|
|
}
|
|
}
|
|
|
|
// fetchFalse fetches and checks remaining bytes of false keyword.
|
|
func (r *Lexer) fetchFalse() {
|
|
r.pos += 5
|
|
if r.pos > len(r.Data) ||
|
|
r.Data[r.pos-4] != 'a' ||
|
|
r.Data[r.pos-3] != 'l' ||
|
|
r.Data[r.pos-2] != 's' ||
|
|
r.Data[r.pos-1] != 'e' ||
|
|
(r.pos != len(r.Data) && !isTokenEnd(r.Data[r.pos])) {
|
|
|
|
r.pos -= 5
|
|
r.errSyntax()
|
|
}
|
|
}
|
|
|
|
// fetchNumber scans a number literal token.
|
|
func (r *Lexer) fetchNumber() {
|
|
hasE := false
|
|
afterE := false
|
|
hasDot := false
|
|
|
|
r.pos++
|
|
for i, c := range r.Data[r.pos:] {
|
|
switch {
|
|
case c >= '0' && c <= '9':
|
|
afterE = false
|
|
case c == '.' && !hasDot:
|
|
hasDot = true
|
|
case (c == 'e' || c == 'E') && !hasE:
|
|
hasE = true
|
|
hasDot = true
|
|
afterE = true
|
|
case (c == '+' || c == '-') && afterE:
|
|
afterE = false
|
|
default:
|
|
r.pos += i
|
|
if !isTokenEnd(c) {
|
|
r.errSyntax()
|
|
} else {
|
|
r.token.byteValue = r.Data[r.start:r.pos]
|
|
}
|
|
return
|
|
}
|
|
}
|
|
|
|
r.pos = len(r.Data)
|
|
r.token.byteValue = r.Data[r.start:]
|
|
}
|
|
|
|
// findStringLen tries to scan into the string literal for ending quote char to determine required size.
|
|
// The size will be exact if no escapes are present and may be inexact if there are escaped chars.
|
|
func findStringLen(data []byte) (isValid, hasEscapes bool, length int) {
|
|
delta := 0
|
|
|
|
for i := 0; i < len(data); i++ {
|
|
switch data[i] {
|
|
case '\\':
|
|
i++
|
|
delta++
|
|
if i < len(data) && data[i] == 'u' {
|
|
delta++
|
|
}
|
|
case '"':
|
|
return true, (delta > 0), (i - delta)
|
|
}
|
|
}
|
|
|
|
return false, false, len(data)
|
|
}
|
|
|
|
// getu4 decodes \uXXXX from the beginning of s, returning the hex value,
|
|
// or it returns -1.
|
|
func getu4(s []byte) rune {
|
|
if len(s) < 6 || s[0] != '\\' || s[1] != 'u' {
|
|
return -1
|
|
}
|
|
var val rune
|
|
for i := 2; i < len(s) && i < 6; i++ {
|
|
var v byte
|
|
c := s[i]
|
|
switch c {
|
|
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
|
|
v = c - '0'
|
|
case 'a', 'b', 'c', 'd', 'e', 'f':
|
|
v = c - 'a' + 10
|
|
case 'A', 'B', 'C', 'D', 'E', 'F':
|
|
v = c - 'A' + 10
|
|
default:
|
|
return -1
|
|
}
|
|
|
|
val <<= 4
|
|
val |= rune(v)
|
|
}
|
|
return val
|
|
}
|
|
|
|
// processEscape processes a single escape sequence and returns number of bytes processed.
|
|
func (r *Lexer) processEscape(data []byte) (int, error) {
|
|
if len(data) < 2 {
|
|
return 0, fmt.Errorf("syntax error at %v", string(data))
|
|
}
|
|
|
|
c := data[1]
|
|
switch c {
|
|
case '"', '/', '\\':
|
|
r.token.byteValue = append(r.token.byteValue, c)
|
|
return 2, nil
|
|
case 'b':
|
|
r.token.byteValue = append(r.token.byteValue, '\b')
|
|
return 2, nil
|
|
case 'f':
|
|
r.token.byteValue = append(r.token.byteValue, '\f')
|
|
return 2, nil
|
|
case 'n':
|
|
r.token.byteValue = append(r.token.byteValue, '\n')
|
|
return 2, nil
|
|
case 'r':
|
|
r.token.byteValue = append(r.token.byteValue, '\r')
|
|
return 2, nil
|
|
case 't':
|
|
r.token.byteValue = append(r.token.byteValue, '\t')
|
|
return 2, nil
|
|
case 'u':
|
|
rr := getu4(data)
|
|
if rr < 0 {
|
|
return 0, errors.New("syntax error")
|
|
}
|
|
|
|
read := 6
|
|
if utf16.IsSurrogate(rr) {
|
|
rr1 := getu4(data[read:])
|
|
if dec := utf16.DecodeRune(rr, rr1); dec != unicode.ReplacementChar {
|
|
read += 6
|
|
rr = dec
|
|
} else {
|
|
rr = unicode.ReplacementChar
|
|
}
|
|
}
|
|
var d [4]byte
|
|
s := utf8.EncodeRune(d[:], rr)
|
|
r.token.byteValue = append(r.token.byteValue, d[:s]...)
|
|
return read, nil
|
|
}
|
|
|
|
return 0, errors.New("syntax error")
|
|
}
|
|
|
|
// fetchString scans a string literal token.
|
|
func (r *Lexer) fetchString() {
|
|
r.pos++
|
|
data := r.Data[r.pos:]
|
|
|
|
isValid, hasEscapes, length := findStringLen(data)
|
|
if !isValid {
|
|
r.pos += length
|
|
r.errParse("unterminated string literal")
|
|
return
|
|
}
|
|
if !hasEscapes {
|
|
r.token.byteValue = data[:length]
|
|
r.pos += length + 1
|
|
return
|
|
}
|
|
|
|
r.token.byteValue = make([]byte, 0, length)
|
|
p := 0
|
|
for i := 0; i < len(data); {
|
|
switch data[i] {
|
|
case '"':
|
|
r.pos += i + 1
|
|
r.token.byteValue = append(r.token.byteValue, data[p:i]...)
|
|
i++
|
|
return
|
|
|
|
case '\\':
|
|
r.token.byteValue = append(r.token.byteValue, data[p:i]...)
|
|
off, err := r.processEscape(data[i:])
|
|
if err != nil {
|
|
r.errParse(err.Error())
|
|
return
|
|
}
|
|
i += off
|
|
p = i
|
|
|
|
default:
|
|
i++
|
|
}
|
|
}
|
|
r.errParse("unterminated string literal")
|
|
}
|
|
|
|
// scanToken scans the next token if no token is currently available in the lexer.
|
|
func (r *Lexer) scanToken() {
|
|
if r.token.kind != tokenUndef || r.fatalError != nil {
|
|
return
|
|
}
|
|
|
|
r.FetchToken()
|
|
}
|
|
|
|
// consume resets the current token to allow scanning the next one.
|
|
func (r *Lexer) consume() {
|
|
r.token.kind = tokenUndef
|
|
r.token.delimValue = 0
|
|
}
|
|
|
|
// Ok returns true if no error (including io.EOF) was encountered during scanning.
|
|
func (r *Lexer) Ok() bool {
|
|
return r.fatalError == nil
|
|
}
|
|
|
|
const maxErrorContextLen = 13
|
|
|
|
func (r *Lexer) errParse(what string) {
|
|
if r.fatalError == nil {
|
|
var str string
|
|
if len(r.Data)-r.pos <= maxErrorContextLen {
|
|
str = string(r.Data)
|
|
} else {
|
|
str = string(r.Data[r.pos:r.pos+maxErrorContextLen-3]) + "..."
|
|
}
|
|
r.fatalError = &LexerError{
|
|
Reason: what,
|
|
Offset: r.pos,
|
|
Data: str,
|
|
}
|
|
}
|
|
}
|
|
|
|
func (r *Lexer) errSyntax() {
|
|
r.errParse("syntax error")
|
|
}
|
|
|
|
func (r *Lexer) errInvalidToken(expected string) {
|
|
if r.fatalError != nil {
|
|
return
|
|
}
|
|
if r.UseMultipleErrors {
|
|
r.pos = r.start
|
|
r.consume()
|
|
r.SkipRecursive()
|
|
switch expected {
|
|
case "[":
|
|
r.token.delimValue = ']'
|
|
r.token.kind = tokenDelim
|
|
case "{":
|
|
r.token.delimValue = '}'
|
|
r.token.kind = tokenDelim
|
|
}
|
|
r.addNonfatalError(&LexerError{
|
|
Reason: fmt.Sprintf("expected %s", expected),
|
|
Offset: r.start,
|
|
Data: string(r.Data[r.start:r.pos]),
|
|
})
|
|
return
|
|
}
|
|
|
|
var str string
|
|
if len(r.token.byteValue) <= maxErrorContextLen {
|
|
str = string(r.token.byteValue)
|
|
} else {
|
|
str = string(r.token.byteValue[:maxErrorContextLen-3]) + "..."
|
|
}
|
|
r.fatalError = &LexerError{
|
|
Reason: fmt.Sprintf("expected %s", expected),
|
|
Offset: r.pos,
|
|
Data: str,
|
|
}
|
|
}
|
|
|
|
func (r *Lexer) GetPos() int {
|
|
return r.pos
|
|
}
|
|
|
|
// Delim consumes a token and verifies that it is the given delimiter.
|
|
func (r *Lexer) Delim(c byte) {
|
|
if r.token.kind == tokenUndef && r.Ok() {
|
|
r.FetchToken()
|
|
}
|
|
|
|
if !r.Ok() || r.token.delimValue != c {
|
|
r.consume() // errInvalidToken can change token if UseMultipleErrors is enabled.
|
|
r.errInvalidToken(string([]byte{c}))
|
|
} else {
|
|
r.consume()
|
|
}
|
|
}
|
|
|
|
// IsDelim returns true if there was no scanning error and next token is the given delimiter.
|
|
func (r *Lexer) IsDelim(c byte) bool {
|
|
if r.token.kind == tokenUndef && r.Ok() {
|
|
r.FetchToken()
|
|
}
|
|
return !r.Ok() || r.token.delimValue == c
|
|
}
|
|
|
|
// Null verifies that the next token is null and consumes it.
|
|
func (r *Lexer) Null() {
|
|
if r.token.kind == tokenUndef && r.Ok() {
|
|
r.FetchToken()
|
|
}
|
|
if !r.Ok() || r.token.kind != tokenNull {
|
|
r.errInvalidToken("null")
|
|
}
|
|
r.consume()
|
|
}
|
|
|
|
// IsNull returns true if the next token is a null keyword.
|
|
func (r *Lexer) IsNull() bool {
|
|
if r.token.kind == tokenUndef && r.Ok() {
|
|
r.FetchToken()
|
|
}
|
|
return r.Ok() && r.token.kind == tokenNull
|
|
}
|
|
|
|
// Skip skips a single token.
|
|
func (r *Lexer) Skip() {
|
|
if r.token.kind == tokenUndef && r.Ok() {
|
|
r.FetchToken()
|
|
}
|
|
r.consume()
|
|
}
|
|
|
|
// SkipRecursive skips next array or object completely, or just skips a single token if not
|
|
// an array/object.
|
|
//
|
|
// Note: no syntax validation is performed on the skipped data.
|
|
func (r *Lexer) SkipRecursive() {
|
|
r.scanToken()
|
|
var start, end byte
|
|
|
|
switch r.token.delimValue {
|
|
case '{':
|
|
start, end = '{', '}'
|
|
case '[':
|
|
start, end = '[', ']'
|
|
default:
|
|
r.consume()
|
|
return
|
|
}
|
|
|
|
r.consume()
|
|
|
|
level := 1
|
|
inQuotes := false
|
|
wasEscape := false
|
|
|
|
for i, c := range r.Data[r.pos:] {
|
|
switch {
|
|
case c == start && !inQuotes:
|
|
level++
|
|
case c == end && !inQuotes:
|
|
level--
|
|
if level == 0 {
|
|
r.pos += i + 1
|
|
return
|
|
}
|
|
case c == '\\' && inQuotes:
|
|
wasEscape = !wasEscape
|
|
continue
|
|
case c == '"' && inQuotes:
|
|
inQuotes = wasEscape
|
|
case c == '"':
|
|
inQuotes = true
|
|
}
|
|
wasEscape = false
|
|
}
|
|
r.pos = len(r.Data)
|
|
r.fatalError = &LexerError{
|
|
Reason: "EOF reached while skipping array/object or token",
|
|
Offset: r.pos,
|
|
Data: string(r.Data[r.pos:]),
|
|
}
|
|
}
|
|
|
|
// Raw fetches the next item recursively as a data slice
|
|
func (r *Lexer) Raw() []byte {
|
|
r.SkipRecursive()
|
|
if !r.Ok() {
|
|
return nil
|
|
}
|
|
return r.Data[r.start:r.pos]
|
|
}
|
|
|
|
// IsStart returns whether the lexer is positioned at the start
|
|
// of an input string.
|
|
func (r *Lexer) IsStart() bool {
|
|
return r.pos == 0
|
|
}
|
|
|
|
// Consumed reads all remaining bytes from the input, publishing an error if
|
|
// there is anything but whitespace remaining.
|
|
func (r *Lexer) Consumed() {
|
|
if r.pos > len(r.Data) || !r.Ok() {
|
|
return
|
|
}
|
|
|
|
for _, c := range r.Data[r.pos:] {
|
|
if c != ' ' && c != '\t' && c != '\r' && c != '\n' {
|
|
r.AddError(&LexerError{
|
|
Reason: "invalid character '" + string(c) + "' after top-level value",
|
|
Offset: r.pos,
|
|
Data: string(r.Data[r.pos:]),
|
|
})
|
|
return
|
|
}
|
|
|
|
r.pos++
|
|
r.start++
|
|
}
|
|
}
|
|
|
|
func (r *Lexer) unsafeString() (string, []byte) {
|
|
if r.token.kind == tokenUndef && r.Ok() {
|
|
r.FetchToken()
|
|
}
|
|
if !r.Ok() || r.token.kind != tokenString {
|
|
r.errInvalidToken("string")
|
|
return "", nil
|
|
}
|
|
bytes := r.token.byteValue
|
|
ret := bytesToStr(r.token.byteValue)
|
|
r.consume()
|
|
return ret, bytes
|
|
}
|
|
|
|
// UnsafeString returns the string value if the token is a string literal.
|
|
//
|
|
// Warning: returned string may point to the input buffer, so the string should not outlive
|
|
// the input buffer. Intended pattern of usage is as an argument to a switch statement.
|
|
func (r *Lexer) UnsafeString() string {
|
|
ret, _ := r.unsafeString()
|
|
return ret
|
|
}
|
|
|
|
// UnsafeBytes returns the byte slice if the token is a string literal.
|
|
func (r *Lexer) UnsafeBytes() []byte {
|
|
_, ret := r.unsafeString()
|
|
return ret
|
|
}
|
|
|
|
// String reads a string literal.
|
|
func (r *Lexer) String() string {
|
|
if r.token.kind == tokenUndef && r.Ok() {
|
|
r.FetchToken()
|
|
}
|
|
if !r.Ok() || r.token.kind != tokenString {
|
|
r.errInvalidToken("string")
|
|
return ""
|
|
}
|
|
ret := string(r.token.byteValue)
|
|
r.consume()
|
|
return ret
|
|
}
|
|
|
|
// Bytes reads a string literal and base64 decodes it into a byte slice.
|
|
func (r *Lexer) Bytes() []byte {
|
|
if r.token.kind == tokenUndef && r.Ok() {
|
|
r.FetchToken()
|
|
}
|
|
if !r.Ok() || r.token.kind != tokenString {
|
|
r.errInvalidToken("string")
|
|
return nil
|
|
}
|
|
ret := make([]byte, base64.StdEncoding.DecodedLen(len(r.token.byteValue)))
|
|
n, err := base64.StdEncoding.Decode(ret, r.token.byteValue)
|
|
if err != nil {
|
|
r.fatalError = &LexerError{
|
|
Reason: err.Error(),
|
|
}
|
|
return nil
|
|
}
|
|
|
|
r.consume()
|
|
return ret[:n]
|
|
}
|
|
|
|
// Bool reads a true or false boolean keyword.
|
|
func (r *Lexer) Bool() bool {
|
|
if r.token.kind == tokenUndef && r.Ok() {
|
|
r.FetchToken()
|
|
}
|
|
if !r.Ok() || r.token.kind != tokenBool {
|
|
r.errInvalidToken("bool")
|
|
return false
|
|
}
|
|
ret := r.token.boolValue
|
|
r.consume()
|
|
return ret
|
|
}
|
|
|
|
func (r *Lexer) number() string {
|
|
if r.token.kind == tokenUndef && r.Ok() {
|
|
r.FetchToken()
|
|
}
|
|
if !r.Ok() || r.token.kind != tokenNumber {
|
|
r.errInvalidToken("number")
|
|
return ""
|
|
}
|
|
ret := bytesToStr(r.token.byteValue)
|
|
r.consume()
|
|
return ret
|
|
}
|
|
|
|
func (r *Lexer) Uint8() uint8 {
|
|
s := r.number()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseUint(s, 10, 8)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: s,
|
|
})
|
|
}
|
|
return uint8(n)
|
|
}
|
|
|
|
func (r *Lexer) Uint16() uint16 {
|
|
s := r.number()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseUint(s, 10, 16)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: s,
|
|
})
|
|
}
|
|
return uint16(n)
|
|
}
|
|
|
|
func (r *Lexer) Uint32() uint32 {
|
|
s := r.number()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseUint(s, 10, 32)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: s,
|
|
})
|
|
}
|
|
return uint32(n)
|
|
}
|
|
|
|
func (r *Lexer) Uint64() uint64 {
|
|
s := r.number()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseUint(s, 10, 64)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: s,
|
|
})
|
|
}
|
|
return n
|
|
}
|
|
|
|
func (r *Lexer) Uint() uint {
|
|
return uint(r.Uint64())
|
|
}
|
|
|
|
func (r *Lexer) Int8() int8 {
|
|
s := r.number()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseInt(s, 10, 8)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: s,
|
|
})
|
|
}
|
|
return int8(n)
|
|
}
|
|
|
|
func (r *Lexer) Int16() int16 {
|
|
s := r.number()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseInt(s, 10, 16)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: s,
|
|
})
|
|
}
|
|
return int16(n)
|
|
}
|
|
|
|
func (r *Lexer) Int32() int32 {
|
|
s := r.number()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseInt(s, 10, 32)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: s,
|
|
})
|
|
}
|
|
return int32(n)
|
|
}
|
|
|
|
func (r *Lexer) Int64() int64 {
|
|
s := r.number()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseInt(s, 10, 64)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: s,
|
|
})
|
|
}
|
|
return n
|
|
}
|
|
|
|
func (r *Lexer) Int() int {
|
|
return int(r.Int64())
|
|
}
|
|
|
|
func (r *Lexer) Uint8Str() uint8 {
|
|
s, b := r.unsafeString()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseUint(s, 10, 8)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: string(b),
|
|
})
|
|
}
|
|
return uint8(n)
|
|
}
|
|
|
|
func (r *Lexer) Uint16Str() uint16 {
|
|
s, b := r.unsafeString()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseUint(s, 10, 16)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: string(b),
|
|
})
|
|
}
|
|
return uint16(n)
|
|
}
|
|
|
|
func (r *Lexer) Uint32Str() uint32 {
|
|
s, b := r.unsafeString()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseUint(s, 10, 32)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: string(b),
|
|
})
|
|
}
|
|
return uint32(n)
|
|
}
|
|
|
|
func (r *Lexer) Uint64Str() uint64 {
|
|
s, b := r.unsafeString()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseUint(s, 10, 64)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: string(b),
|
|
})
|
|
}
|
|
return n
|
|
}
|
|
|
|
func (r *Lexer) UintStr() uint {
|
|
return uint(r.Uint64Str())
|
|
}
|
|
|
|
func (r *Lexer) UintptrStr() uintptr {
|
|
return uintptr(r.Uint64Str())
|
|
}
|
|
|
|
func (r *Lexer) Int8Str() int8 {
|
|
s, b := r.unsafeString()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseInt(s, 10, 8)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: string(b),
|
|
})
|
|
}
|
|
return int8(n)
|
|
}
|
|
|
|
func (r *Lexer) Int16Str() int16 {
|
|
s, b := r.unsafeString()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseInt(s, 10, 16)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: string(b),
|
|
})
|
|
}
|
|
return int16(n)
|
|
}
|
|
|
|
func (r *Lexer) Int32Str() int32 {
|
|
s, b := r.unsafeString()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseInt(s, 10, 32)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: string(b),
|
|
})
|
|
}
|
|
return int32(n)
|
|
}
|
|
|
|
func (r *Lexer) Int64Str() int64 {
|
|
s, b := r.unsafeString()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseInt(s, 10, 64)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: string(b),
|
|
})
|
|
}
|
|
return n
|
|
}
|
|
|
|
func (r *Lexer) IntStr() int {
|
|
return int(r.Int64Str())
|
|
}
|
|
|
|
func (r *Lexer) Float32() float32 {
|
|
s := r.number()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseFloat(s, 32)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: s,
|
|
})
|
|
}
|
|
return float32(n)
|
|
}
|
|
|
|
func (r *Lexer) Float32Str() float32 {
|
|
s, b := r.unsafeString()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
n, err := strconv.ParseFloat(s, 32)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: string(b),
|
|
})
|
|
}
|
|
return float32(n)
|
|
}
|
|
|
|
func (r *Lexer) Float64() float64 {
|
|
s := r.number()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
|
|
n, err := strconv.ParseFloat(s, 64)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: s,
|
|
})
|
|
}
|
|
return n
|
|
}
|
|
|
|
func (r *Lexer) Float64Str() float64 {
|
|
s, b := r.unsafeString()
|
|
if !r.Ok() {
|
|
return 0
|
|
}
|
|
n, err := strconv.ParseFloat(s, 64)
|
|
if err != nil {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Reason: err.Error(),
|
|
Data: string(b),
|
|
})
|
|
}
|
|
return n
|
|
}
|
|
|
|
func (r *Lexer) Error() error {
|
|
return r.fatalError
|
|
}
|
|
|
|
func (r *Lexer) AddError(e error) {
|
|
if r.fatalError == nil {
|
|
r.fatalError = e
|
|
}
|
|
}
|
|
|
|
func (r *Lexer) AddNonFatalError(e error) {
|
|
r.addNonfatalError(&LexerError{
|
|
Offset: r.start,
|
|
Data: string(r.Data[r.start:r.pos]),
|
|
Reason: e.Error(),
|
|
})
|
|
}
|
|
|
|
func (r *Lexer) addNonfatalError(err *LexerError) {
|
|
if r.UseMultipleErrors {
|
|
// We don't want to add errors with the same offset.
|
|
if len(r.multipleErrors) != 0 && r.multipleErrors[len(r.multipleErrors)-1].Offset == err.Offset {
|
|
return
|
|
}
|
|
r.multipleErrors = append(r.multipleErrors, err)
|
|
return
|
|
}
|
|
r.fatalError = err
|
|
}
|
|
|
|
func (r *Lexer) GetNonFatalErrors() []*LexerError {
|
|
return r.multipleErrors
|
|
}
|
|
|
|
// JsonNumber fetches and json.Number from 'encoding/json' package.
|
|
// Both int, float or string, contains them are valid values
|
|
func (r *Lexer) JsonNumber() json.Number {
|
|
if r.token.kind == tokenUndef && r.Ok() {
|
|
r.FetchToken()
|
|
}
|
|
if !r.Ok() {
|
|
r.errInvalidToken("json.Number")
|
|
return json.Number("")
|
|
}
|
|
|
|
switch r.token.kind {
|
|
case tokenString:
|
|
return json.Number(r.String())
|
|
case tokenNumber:
|
|
return json.Number(r.Raw())
|
|
case tokenNull:
|
|
r.Null()
|
|
return json.Number("")
|
|
default:
|
|
r.errSyntax()
|
|
return json.Number("")
|
|
}
|
|
}
|
|
|
|
// Interface fetches an interface{} analogous to the 'encoding/json' package.
|
|
func (r *Lexer) Interface() interface{} {
|
|
if r.token.kind == tokenUndef && r.Ok() {
|
|
r.FetchToken()
|
|
}
|
|
|
|
if !r.Ok() {
|
|
return nil
|
|
}
|
|
switch r.token.kind {
|
|
case tokenString:
|
|
return r.String()
|
|
case tokenNumber:
|
|
return r.Float64()
|
|
case tokenBool:
|
|
return r.Bool()
|
|
case tokenNull:
|
|
r.Null()
|
|
return nil
|
|
}
|
|
|
|
if r.token.delimValue == '{' {
|
|
r.consume()
|
|
|
|
ret := map[string]interface{}{}
|
|
for !r.IsDelim('}') {
|
|
key := r.String()
|
|
r.WantColon()
|
|
ret[key] = r.Interface()
|
|
r.WantComma()
|
|
}
|
|
r.Delim('}')
|
|
|
|
if r.Ok() {
|
|
return ret
|
|
} else {
|
|
return nil
|
|
}
|
|
} else if r.token.delimValue == '[' {
|
|
r.consume()
|
|
|
|
ret := []interface{}{}
|
|
for !r.IsDelim(']') {
|
|
ret = append(ret, r.Interface())
|
|
r.WantComma()
|
|
}
|
|
r.Delim(']')
|
|
|
|
if r.Ok() {
|
|
return ret
|
|
} else {
|
|
return nil
|
|
}
|
|
}
|
|
r.errSyntax()
|
|
return nil
|
|
}
|
|
|
|
// WantComma requires a comma to be present before fetching next token.
|
|
func (r *Lexer) WantComma() {
|
|
r.wantSep = ','
|
|
r.firstElement = false
|
|
}
|
|
|
|
// WantColon requires a colon to be present before fetching next token.
|
|
func (r *Lexer) WantColon() {
|
|
r.wantSep = ':'
|
|
r.firstElement = false
|
|
}
|