forked from cerc-io/plugeth
289b30715d
This commit converts the dependency management from Godeps to the vendor folder, also switching the tool from godep to trash. Since the upstream tool lacks a few features proposed via a few PRs, until those PRs are merged in (if), use github.com/karalabe/trash. You can update dependencies via trash --update. All dependencies have been updated to their latest version. Parts of the build system are reworked to drop old notions of Godeps and invocation of the go vet command so that it doesn't run against the vendor folder, as that will just blow up during vetting. The conversion drops OpenCL (and hence GPU mining support) from ethash and our codebase. The short reasoning is that there's noone to maintain and having opencl libs in our deps messes up builds as go install ./... tries to build them, failing with unsatisfied link errors for the C OpenCL deps. golang.org/x/net/context is not vendored in. We expect it to be fetched by the user (i.e. using go get). To keep ci.go builds reproducible the package is "vendored" in build/_vendor.
867 lines
18 KiB
Go
867 lines
18 KiB
Go
package parser
|
|
|
|
import (
|
|
"bytes"
|
|
"errors"
|
|
"fmt"
|
|
"regexp"
|
|
"strconv"
|
|
"strings"
|
|
"unicode"
|
|
"unicode/utf8"
|
|
|
|
"github.com/robertkrimen/otto/ast"
|
|
"github.com/robertkrimen/otto/file"
|
|
"github.com/robertkrimen/otto/token"
|
|
)
|
|
|
|
type _chr struct {
|
|
value rune
|
|
width int
|
|
}
|
|
|
|
var matchIdentifier = regexp.MustCompile(`^[$_\p{L}][$_\p{L}\d}]*$`)
|
|
|
|
func isDecimalDigit(chr rune) bool {
|
|
return '0' <= chr && chr <= '9'
|
|
}
|
|
|
|
func digitValue(chr rune) int {
|
|
switch {
|
|
case '0' <= chr && chr <= '9':
|
|
return int(chr - '0')
|
|
case 'a' <= chr && chr <= 'f':
|
|
return int(chr - 'a' + 10)
|
|
case 'A' <= chr && chr <= 'F':
|
|
return int(chr - 'A' + 10)
|
|
}
|
|
return 16 // Larger than any legal digit value
|
|
}
|
|
|
|
func isDigit(chr rune, base int) bool {
|
|
return digitValue(chr) < base
|
|
}
|
|
|
|
func isIdentifierStart(chr rune) bool {
|
|
return chr == '$' || chr == '_' || chr == '\\' ||
|
|
'a' <= chr && chr <= 'z' || 'A' <= chr && chr <= 'Z' ||
|
|
chr >= utf8.RuneSelf && unicode.IsLetter(chr)
|
|
}
|
|
|
|
func isIdentifierPart(chr rune) bool {
|
|
return chr == '$' || chr == '_' || chr == '\\' ||
|
|
'a' <= chr && chr <= 'z' || 'A' <= chr && chr <= 'Z' ||
|
|
'0' <= chr && chr <= '9' ||
|
|
chr >= utf8.RuneSelf && (unicode.IsLetter(chr) || unicode.IsDigit(chr))
|
|
}
|
|
|
|
func (self *_parser) scanIdentifier() (string, error) {
|
|
offset := self.chrOffset
|
|
parse := false
|
|
for isIdentifierPart(self.chr) {
|
|
if self.chr == '\\' {
|
|
distance := self.chrOffset - offset
|
|
self.read()
|
|
if self.chr != 'u' {
|
|
return "", fmt.Errorf("Invalid identifier escape character: %c (%s)", self.chr, string(self.chr))
|
|
}
|
|
parse = true
|
|
var value rune
|
|
for j := 0; j < 4; j++ {
|
|
self.read()
|
|
decimal, ok := hex2decimal(byte(self.chr))
|
|
if !ok {
|
|
return "", fmt.Errorf("Invalid identifier escape character: %c (%s)", self.chr, string(self.chr))
|
|
}
|
|
value = value<<4 | decimal
|
|
}
|
|
if value == '\\' {
|
|
return "", fmt.Errorf("Invalid identifier escape value: %c (%s)", value, string(value))
|
|
} else if distance == 0 {
|
|
if !isIdentifierStart(value) {
|
|
return "", fmt.Errorf("Invalid identifier escape value: %c (%s)", value, string(value))
|
|
}
|
|
} else if distance > 0 {
|
|
if !isIdentifierPart(value) {
|
|
return "", fmt.Errorf("Invalid identifier escape value: %c (%s)", value, string(value))
|
|
}
|
|
}
|
|
}
|
|
self.read()
|
|
}
|
|
literal := string(self.str[offset:self.chrOffset])
|
|
if parse {
|
|
return parseStringLiteral(literal)
|
|
}
|
|
return literal, nil
|
|
}
|
|
|
|
// 7.2
|
|
func isLineWhiteSpace(chr rune) bool {
|
|
switch chr {
|
|
case '\u0009', '\u000b', '\u000c', '\u0020', '\u00a0', '\ufeff':
|
|
return true
|
|
case '\u000a', '\u000d', '\u2028', '\u2029':
|
|
return false
|
|
case '\u0085':
|
|
return false
|
|
}
|
|
return unicode.IsSpace(chr)
|
|
}
|
|
|
|
// 7.3
|
|
func isLineTerminator(chr rune) bool {
|
|
switch chr {
|
|
case '\u000a', '\u000d', '\u2028', '\u2029':
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (self *_parser) scan() (tkn token.Token, literal string, idx file.Idx) {
|
|
|
|
self.implicitSemicolon = false
|
|
|
|
for {
|
|
self.skipWhiteSpace()
|
|
|
|
idx = self.idxOf(self.chrOffset)
|
|
insertSemicolon := false
|
|
|
|
switch chr := self.chr; {
|
|
case isIdentifierStart(chr):
|
|
var err error
|
|
literal, err = self.scanIdentifier()
|
|
if err != nil {
|
|
tkn = token.ILLEGAL
|
|
break
|
|
}
|
|
if len(literal) > 1 {
|
|
// Keywords are longer than 1 character, avoid lookup otherwise
|
|
var strict bool
|
|
tkn, strict = token.IsKeyword(literal)
|
|
|
|
switch tkn {
|
|
|
|
case 0: // Not a keyword
|
|
if literal == "true" || literal == "false" {
|
|
self.insertSemicolon = true
|
|
tkn = token.BOOLEAN
|
|
return
|
|
} else if literal == "null" {
|
|
self.insertSemicolon = true
|
|
tkn = token.NULL
|
|
return
|
|
}
|
|
|
|
case token.KEYWORD:
|
|
tkn = token.KEYWORD
|
|
if strict {
|
|
// TODO If strict and in strict mode, then this is not a break
|
|
break
|
|
}
|
|
return
|
|
|
|
case
|
|
token.THIS,
|
|
token.BREAK,
|
|
token.THROW, // A newline after a throw is not allowed, but we need to detect it
|
|
token.RETURN,
|
|
token.CONTINUE,
|
|
token.DEBUGGER:
|
|
self.insertSemicolon = true
|
|
return
|
|
|
|
default:
|
|
return
|
|
|
|
}
|
|
}
|
|
self.insertSemicolon = true
|
|
tkn = token.IDENTIFIER
|
|
return
|
|
case '0' <= chr && chr <= '9':
|
|
self.insertSemicolon = true
|
|
tkn, literal = self.scanNumericLiteral(false)
|
|
return
|
|
default:
|
|
self.read()
|
|
switch chr {
|
|
case -1:
|
|
if self.insertSemicolon {
|
|
self.insertSemicolon = false
|
|
self.implicitSemicolon = true
|
|
}
|
|
tkn = token.EOF
|
|
case '\r', '\n', '\u2028', '\u2029':
|
|
self.insertSemicolon = false
|
|
self.implicitSemicolon = true
|
|
self.comments.AtLineBreak()
|
|
continue
|
|
case ':':
|
|
tkn = token.COLON
|
|
case '.':
|
|
if digitValue(self.chr) < 10 {
|
|
insertSemicolon = true
|
|
tkn, literal = self.scanNumericLiteral(true)
|
|
} else {
|
|
tkn = token.PERIOD
|
|
}
|
|
case ',':
|
|
tkn = token.COMMA
|
|
case ';':
|
|
tkn = token.SEMICOLON
|
|
case '(':
|
|
tkn = token.LEFT_PARENTHESIS
|
|
case ')':
|
|
tkn = token.RIGHT_PARENTHESIS
|
|
insertSemicolon = true
|
|
case '[':
|
|
tkn = token.LEFT_BRACKET
|
|
case ']':
|
|
tkn = token.RIGHT_BRACKET
|
|
insertSemicolon = true
|
|
case '{':
|
|
tkn = token.LEFT_BRACE
|
|
case '}':
|
|
tkn = token.RIGHT_BRACE
|
|
insertSemicolon = true
|
|
case '+':
|
|
tkn = self.switch3(token.PLUS, token.ADD_ASSIGN, '+', token.INCREMENT)
|
|
if tkn == token.INCREMENT {
|
|
insertSemicolon = true
|
|
}
|
|
case '-':
|
|
tkn = self.switch3(token.MINUS, token.SUBTRACT_ASSIGN, '-', token.DECREMENT)
|
|
if tkn == token.DECREMENT {
|
|
insertSemicolon = true
|
|
}
|
|
case '*':
|
|
tkn = self.switch2(token.MULTIPLY, token.MULTIPLY_ASSIGN)
|
|
case '/':
|
|
if self.chr == '/' {
|
|
if self.mode&StoreComments != 0 {
|
|
literal := string(self.readSingleLineComment())
|
|
self.comments.AddComment(ast.NewComment(literal, self.idx))
|
|
continue
|
|
}
|
|
self.skipSingleLineComment()
|
|
continue
|
|
} else if self.chr == '*' {
|
|
if self.mode&StoreComments != 0 {
|
|
literal = string(self.readMultiLineComment())
|
|
self.comments.AddComment(ast.NewComment(literal, self.idx))
|
|
continue
|
|
}
|
|
self.skipMultiLineComment()
|
|
continue
|
|
} else {
|
|
// Could be division, could be RegExp literal
|
|
tkn = self.switch2(token.SLASH, token.QUOTIENT_ASSIGN)
|
|
insertSemicolon = true
|
|
}
|
|
case '%':
|
|
tkn = self.switch2(token.REMAINDER, token.REMAINDER_ASSIGN)
|
|
case '^':
|
|
tkn = self.switch2(token.EXCLUSIVE_OR, token.EXCLUSIVE_OR_ASSIGN)
|
|
case '<':
|
|
tkn = self.switch4(token.LESS, token.LESS_OR_EQUAL, '<', token.SHIFT_LEFT, token.SHIFT_LEFT_ASSIGN)
|
|
case '>':
|
|
tkn = self.switch6(token.GREATER, token.GREATER_OR_EQUAL, '>', token.SHIFT_RIGHT, token.SHIFT_RIGHT_ASSIGN, '>', token.UNSIGNED_SHIFT_RIGHT, token.UNSIGNED_SHIFT_RIGHT_ASSIGN)
|
|
case '=':
|
|
tkn = self.switch2(token.ASSIGN, token.EQUAL)
|
|
if tkn == token.EQUAL && self.chr == '=' {
|
|
self.read()
|
|
tkn = token.STRICT_EQUAL
|
|
}
|
|
case '!':
|
|
tkn = self.switch2(token.NOT, token.NOT_EQUAL)
|
|
if tkn == token.NOT_EQUAL && self.chr == '=' {
|
|
self.read()
|
|
tkn = token.STRICT_NOT_EQUAL
|
|
}
|
|
case '&':
|
|
if self.chr == '^' {
|
|
self.read()
|
|
tkn = self.switch2(token.AND_NOT, token.AND_NOT_ASSIGN)
|
|
} else {
|
|
tkn = self.switch3(token.AND, token.AND_ASSIGN, '&', token.LOGICAL_AND)
|
|
}
|
|
case '|':
|
|
tkn = self.switch3(token.OR, token.OR_ASSIGN, '|', token.LOGICAL_OR)
|
|
case '~':
|
|
tkn = token.BITWISE_NOT
|
|
case '?':
|
|
tkn = token.QUESTION_MARK
|
|
case '"', '\'':
|
|
insertSemicolon = true
|
|
tkn = token.STRING
|
|
var err error
|
|
literal, err = self.scanString(self.chrOffset - 1)
|
|
if err != nil {
|
|
tkn = token.ILLEGAL
|
|
}
|
|
default:
|
|
self.errorUnexpected(idx, chr)
|
|
tkn = token.ILLEGAL
|
|
}
|
|
}
|
|
self.insertSemicolon = insertSemicolon
|
|
return
|
|
}
|
|
}
|
|
|
|
func (self *_parser) switch2(tkn0, tkn1 token.Token) token.Token {
|
|
if self.chr == '=' {
|
|
self.read()
|
|
return tkn1
|
|
}
|
|
return tkn0
|
|
}
|
|
|
|
func (self *_parser) switch3(tkn0, tkn1 token.Token, chr2 rune, tkn2 token.Token) token.Token {
|
|
if self.chr == '=' {
|
|
self.read()
|
|
return tkn1
|
|
}
|
|
if self.chr == chr2 {
|
|
self.read()
|
|
return tkn2
|
|
}
|
|
return tkn0
|
|
}
|
|
|
|
func (self *_parser) switch4(tkn0, tkn1 token.Token, chr2 rune, tkn2, tkn3 token.Token) token.Token {
|
|
if self.chr == '=' {
|
|
self.read()
|
|
return tkn1
|
|
}
|
|
if self.chr == chr2 {
|
|
self.read()
|
|
if self.chr == '=' {
|
|
self.read()
|
|
return tkn3
|
|
}
|
|
return tkn2
|
|
}
|
|
return tkn0
|
|
}
|
|
|
|
func (self *_parser) switch6(tkn0, tkn1 token.Token, chr2 rune, tkn2, tkn3 token.Token, chr3 rune, tkn4, tkn5 token.Token) token.Token {
|
|
if self.chr == '=' {
|
|
self.read()
|
|
return tkn1
|
|
}
|
|
if self.chr == chr2 {
|
|
self.read()
|
|
if self.chr == '=' {
|
|
self.read()
|
|
return tkn3
|
|
}
|
|
if self.chr == chr3 {
|
|
self.read()
|
|
if self.chr == '=' {
|
|
self.read()
|
|
return tkn5
|
|
}
|
|
return tkn4
|
|
}
|
|
return tkn2
|
|
}
|
|
return tkn0
|
|
}
|
|
|
|
func (self *_parser) chrAt(index int) _chr {
|
|
value, width := utf8.DecodeRuneInString(self.str[index:])
|
|
return _chr{
|
|
value: value,
|
|
width: width,
|
|
}
|
|
}
|
|
|
|
func (self *_parser) _peek() rune {
|
|
if self.offset+1 < self.length {
|
|
return rune(self.str[self.offset+1])
|
|
}
|
|
return -1
|
|
}
|
|
|
|
func (self *_parser) read() {
|
|
if self.offset < self.length {
|
|
self.chrOffset = self.offset
|
|
chr, width := rune(self.str[self.offset]), 1
|
|
if chr >= utf8.RuneSelf { // !ASCII
|
|
chr, width = utf8.DecodeRuneInString(self.str[self.offset:])
|
|
if chr == utf8.RuneError && width == 1 {
|
|
self.error(self.chrOffset, "Invalid UTF-8 character")
|
|
}
|
|
}
|
|
self.offset += width
|
|
self.chr = chr
|
|
} else {
|
|
self.chrOffset = self.length
|
|
self.chr = -1 // EOF
|
|
}
|
|
}
|
|
|
|
// This is here since the functions are so similar
|
|
func (self *_RegExp_parser) read() {
|
|
if self.offset < self.length {
|
|
self.chrOffset = self.offset
|
|
chr, width := rune(self.str[self.offset]), 1
|
|
if chr >= utf8.RuneSelf { // !ASCII
|
|
chr, width = utf8.DecodeRuneInString(self.str[self.offset:])
|
|
if chr == utf8.RuneError && width == 1 {
|
|
self.error(self.chrOffset, "Invalid UTF-8 character")
|
|
}
|
|
}
|
|
self.offset += width
|
|
self.chr = chr
|
|
} else {
|
|
self.chrOffset = self.length
|
|
self.chr = -1 // EOF
|
|
}
|
|
}
|
|
|
|
func (self *_parser) readSingleLineComment() (result []rune) {
|
|
for self.chr != -1 {
|
|
self.read()
|
|
if isLineTerminator(self.chr) {
|
|
return
|
|
}
|
|
result = append(result, self.chr)
|
|
}
|
|
|
|
// Get rid of the trailing -1
|
|
result = result[:len(result)-1]
|
|
|
|
return
|
|
}
|
|
|
|
func (self *_parser) readMultiLineComment() (result []rune) {
|
|
self.read()
|
|
for self.chr >= 0 {
|
|
chr := self.chr
|
|
self.read()
|
|
if chr == '*' && self.chr == '/' {
|
|
self.read()
|
|
return
|
|
}
|
|
|
|
result = append(result, chr)
|
|
}
|
|
|
|
self.errorUnexpected(0, self.chr)
|
|
|
|
return
|
|
}
|
|
|
|
func (self *_parser) skipSingleLineComment() {
|
|
for self.chr != -1 {
|
|
self.read()
|
|
if isLineTerminator(self.chr) {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (self *_parser) skipMultiLineComment() {
|
|
self.read()
|
|
for self.chr >= 0 {
|
|
chr := self.chr
|
|
self.read()
|
|
if chr == '*' && self.chr == '/' {
|
|
self.read()
|
|
return
|
|
}
|
|
}
|
|
|
|
self.errorUnexpected(0, self.chr)
|
|
}
|
|
|
|
func (self *_parser) skipWhiteSpace() {
|
|
for {
|
|
switch self.chr {
|
|
case ' ', '\t', '\f', '\v', '\u00a0', '\ufeff':
|
|
self.read()
|
|
continue
|
|
case '\r':
|
|
if self._peek() == '\n' {
|
|
self.comments.AtLineBreak()
|
|
self.read()
|
|
}
|
|
fallthrough
|
|
case '\u2028', '\u2029', '\n':
|
|
if self.insertSemicolon {
|
|
return
|
|
}
|
|
self.comments.AtLineBreak()
|
|
self.read()
|
|
continue
|
|
}
|
|
if self.chr >= utf8.RuneSelf {
|
|
if unicode.IsSpace(self.chr) {
|
|
self.read()
|
|
continue
|
|
}
|
|
}
|
|
break
|
|
}
|
|
}
|
|
|
|
func (self *_parser) skipLineWhiteSpace() {
|
|
for isLineWhiteSpace(self.chr) {
|
|
self.read()
|
|
}
|
|
}
|
|
|
|
func (self *_parser) scanMantissa(base int) {
|
|
for digitValue(self.chr) < base {
|
|
self.read()
|
|
}
|
|
}
|
|
|
|
func (self *_parser) scanEscape(quote rune) {
|
|
|
|
var length, base uint32
|
|
switch self.chr {
|
|
//case '0', '1', '2', '3', '4', '5', '6', '7':
|
|
// Octal:
|
|
// length, base, limit = 3, 8, 255
|
|
case 'a', 'b', 'f', 'n', 'r', 't', 'v', '\\', '"', '\'', '0':
|
|
self.read()
|
|
return
|
|
case '\r', '\n', '\u2028', '\u2029':
|
|
self.scanNewline()
|
|
return
|
|
case 'x':
|
|
self.read()
|
|
length, base = 2, 16
|
|
case 'u':
|
|
self.read()
|
|
length, base = 4, 16
|
|
default:
|
|
self.read() // Always make progress
|
|
return
|
|
}
|
|
|
|
var value uint32
|
|
for ; length > 0 && self.chr != quote && self.chr >= 0; length-- {
|
|
digit := uint32(digitValue(self.chr))
|
|
if digit >= base {
|
|
break
|
|
}
|
|
value = value*base + digit
|
|
self.read()
|
|
}
|
|
}
|
|
|
|
func (self *_parser) scanString(offset int) (string, error) {
|
|
// " ' /
|
|
quote := rune(self.str[offset])
|
|
|
|
for self.chr != quote {
|
|
chr := self.chr
|
|
if chr == '\n' || chr == '\r' || chr == '\u2028' || chr == '\u2029' || chr < 0 {
|
|
goto newline
|
|
}
|
|
self.read()
|
|
if chr == '\\' {
|
|
if quote == '/' {
|
|
if self.chr == '\n' || self.chr == '\r' || self.chr == '\u2028' || self.chr == '\u2029' || self.chr < 0 {
|
|
goto newline
|
|
}
|
|
self.read()
|
|
} else {
|
|
self.scanEscape(quote)
|
|
}
|
|
} else if chr == '[' && quote == '/' {
|
|
// Allow a slash (/) in a bracket character class ([...])
|
|
// TODO Fix this, this is hacky...
|
|
quote = -1
|
|
} else if chr == ']' && quote == -1 {
|
|
quote = '/'
|
|
}
|
|
}
|
|
|
|
// " ' /
|
|
self.read()
|
|
|
|
return string(self.str[offset:self.chrOffset]), nil
|
|
|
|
newline:
|
|
self.scanNewline()
|
|
err := "String not terminated"
|
|
if quote == '/' {
|
|
err = "Invalid regular expression: missing /"
|
|
self.error(self.idxOf(offset), err)
|
|
}
|
|
return "", errors.New(err)
|
|
}
|
|
|
|
func (self *_parser) scanNewline() {
|
|
if self.chr == '\r' {
|
|
self.read()
|
|
if self.chr != '\n' {
|
|
return
|
|
}
|
|
}
|
|
self.read()
|
|
}
|
|
|
|
func hex2decimal(chr byte) (value rune, ok bool) {
|
|
{
|
|
chr := rune(chr)
|
|
switch {
|
|
case '0' <= chr && chr <= '9':
|
|
return chr - '0', true
|
|
case 'a' <= chr && chr <= 'f':
|
|
return chr - 'a' + 10, true
|
|
case 'A' <= chr && chr <= 'F':
|
|
return chr - 'A' + 10, true
|
|
}
|
|
return
|
|
}
|
|
}
|
|
|
|
func parseNumberLiteral(literal string) (value interface{}, err error) {
|
|
// TODO Is Uint okay? What about -MAX_UINT
|
|
value, err = strconv.ParseInt(literal, 0, 64)
|
|
if err == nil {
|
|
return
|
|
}
|
|
|
|
parseIntErr := err // Save this first error, just in case
|
|
|
|
value, err = strconv.ParseFloat(literal, 64)
|
|
if err == nil {
|
|
return
|
|
} else if err.(*strconv.NumError).Err == strconv.ErrRange {
|
|
// Infinity, etc.
|
|
return value, nil
|
|
}
|
|
|
|
err = parseIntErr
|
|
|
|
if err.(*strconv.NumError).Err == strconv.ErrRange {
|
|
if len(literal) > 2 && literal[0] == '0' && (literal[1] == 'X' || literal[1] == 'x') {
|
|
// Could just be a very large number (e.g. 0x8000000000000000)
|
|
var value float64
|
|
literal = literal[2:]
|
|
for _, chr := range literal {
|
|
digit := digitValue(chr)
|
|
if digit >= 16 {
|
|
goto error
|
|
}
|
|
value = value*16 + float64(digit)
|
|
}
|
|
return value, nil
|
|
}
|
|
}
|
|
|
|
error:
|
|
return nil, errors.New("Illegal numeric literal")
|
|
}
|
|
|
|
func parseStringLiteral(literal string) (string, error) {
|
|
// Best case scenario...
|
|
if literal == "" {
|
|
return "", nil
|
|
}
|
|
|
|
// Slightly less-best case scenario...
|
|
if !strings.ContainsRune(literal, '\\') {
|
|
return literal, nil
|
|
}
|
|
|
|
str := literal
|
|
buffer := bytes.NewBuffer(make([]byte, 0, 3*len(literal)/2))
|
|
|
|
for len(str) > 0 {
|
|
switch chr := str[0]; {
|
|
// We do not explicitly handle the case of the quote
|
|
// value, which can be: " ' /
|
|
// This assumes we're already passed a partially well-formed literal
|
|
case chr >= utf8.RuneSelf:
|
|
chr, size := utf8.DecodeRuneInString(str)
|
|
buffer.WriteRune(chr)
|
|
str = str[size:]
|
|
continue
|
|
case chr != '\\':
|
|
buffer.WriteByte(chr)
|
|
str = str[1:]
|
|
continue
|
|
}
|
|
|
|
if len(str) <= 1 {
|
|
panic("len(str) <= 1")
|
|
}
|
|
chr := str[1]
|
|
var value rune
|
|
if chr >= utf8.RuneSelf {
|
|
str = str[1:]
|
|
var size int
|
|
value, size = utf8.DecodeRuneInString(str)
|
|
str = str[size:] // \ + <character>
|
|
} else {
|
|
str = str[2:] // \<character>
|
|
switch chr {
|
|
case 'b':
|
|
value = '\b'
|
|
case 'f':
|
|
value = '\f'
|
|
case 'n':
|
|
value = '\n'
|
|
case 'r':
|
|
value = '\r'
|
|
case 't':
|
|
value = '\t'
|
|
case 'v':
|
|
value = '\v'
|
|
case 'x', 'u':
|
|
size := 0
|
|
switch chr {
|
|
case 'x':
|
|
size = 2
|
|
case 'u':
|
|
size = 4
|
|
}
|
|
if len(str) < size {
|
|
return "", fmt.Errorf("invalid escape: \\%s: len(%q) != %d", string(chr), str, size)
|
|
}
|
|
for j := 0; j < size; j++ {
|
|
decimal, ok := hex2decimal(str[j])
|
|
if !ok {
|
|
return "", fmt.Errorf("invalid escape: \\%s: %q", string(chr), str[:size])
|
|
}
|
|
value = value<<4 | decimal
|
|
}
|
|
str = str[size:]
|
|
if chr == 'x' {
|
|
break
|
|
}
|
|
if value > utf8.MaxRune {
|
|
panic("value > utf8.MaxRune")
|
|
}
|
|
case '0':
|
|
if len(str) == 0 || '0' > str[0] || str[0] > '7' {
|
|
value = 0
|
|
break
|
|
}
|
|
fallthrough
|
|
case '1', '2', '3', '4', '5', '6', '7':
|
|
// TODO strict
|
|
value = rune(chr) - '0'
|
|
j := 0
|
|
for ; j < 2; j++ {
|
|
if len(str) < j+1 {
|
|
break
|
|
}
|
|
chr := str[j]
|
|
if '0' > chr || chr > '7' {
|
|
break
|
|
}
|
|
decimal := rune(str[j]) - '0'
|
|
value = (value << 3) | decimal
|
|
}
|
|
str = str[j:]
|
|
case '\\':
|
|
value = '\\'
|
|
case '\'', '"':
|
|
value = rune(chr)
|
|
case '\r':
|
|
if len(str) > 0 {
|
|
if str[0] == '\n' {
|
|
str = str[1:]
|
|
}
|
|
}
|
|
fallthrough
|
|
case '\n':
|
|
continue
|
|
default:
|
|
value = rune(chr)
|
|
}
|
|
}
|
|
buffer.WriteRune(value)
|
|
}
|
|
|
|
return buffer.String(), nil
|
|
}
|
|
|
|
func (self *_parser) scanNumericLiteral(decimalPoint bool) (token.Token, string) {
|
|
|
|
offset := self.chrOffset
|
|
tkn := token.NUMBER
|
|
|
|
if decimalPoint {
|
|
offset--
|
|
self.scanMantissa(10)
|
|
goto exponent
|
|
}
|
|
|
|
if self.chr == '0' {
|
|
offset := self.chrOffset
|
|
self.read()
|
|
if self.chr == 'x' || self.chr == 'X' {
|
|
// Hexadecimal
|
|
self.read()
|
|
if isDigit(self.chr, 16) {
|
|
self.read()
|
|
} else {
|
|
return token.ILLEGAL, self.str[offset:self.chrOffset]
|
|
}
|
|
self.scanMantissa(16)
|
|
|
|
if self.chrOffset-offset <= 2 {
|
|
// Only "0x" or "0X"
|
|
self.error(0, "Illegal hexadecimal number")
|
|
}
|
|
|
|
goto hexadecimal
|
|
} else if self.chr == '.' {
|
|
// Float
|
|
goto float
|
|
} else {
|
|
// Octal, Float
|
|
if self.chr == 'e' || self.chr == 'E' {
|
|
goto exponent
|
|
}
|
|
self.scanMantissa(8)
|
|
if self.chr == '8' || self.chr == '9' {
|
|
return token.ILLEGAL, self.str[offset:self.chrOffset]
|
|
}
|
|
goto octal
|
|
}
|
|
}
|
|
|
|
self.scanMantissa(10)
|
|
|
|
float:
|
|
if self.chr == '.' {
|
|
self.read()
|
|
self.scanMantissa(10)
|
|
}
|
|
|
|
exponent:
|
|
if self.chr == 'e' || self.chr == 'E' {
|
|
self.read()
|
|
if self.chr == '-' || self.chr == '+' {
|
|
self.read()
|
|
}
|
|
if isDecimalDigit(self.chr) {
|
|
self.read()
|
|
self.scanMantissa(10)
|
|
} else {
|
|
return token.ILLEGAL, self.str[offset:self.chrOffset]
|
|
}
|
|
}
|
|
|
|
hexadecimal:
|
|
octal:
|
|
if isIdentifierStart(self.chr) || isDecimalDigit(self.chr) {
|
|
return token.ILLEGAL, self.str[offset:self.chrOffset]
|
|
}
|
|
|
|
return tkn, self.str[offset:self.chrOffset]
|
|
}
|