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toml: fix unicode and escape value decoding (#12534)
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Larpon
GitHub
parent
13a2d547b4
commit
3f0e532660
@ -9,6 +9,11 @@ import toml.token
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import toml.scanner
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import strconv
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const (
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// utf8_max is the largest inclusive value of the Unicodes scalar value ranges.
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utf8_max = 0x10FFFF
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)
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// Decoder decode special sequences in a tree of TOML `ast.Value`'s.
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pub struct Decoder {
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scanner &scanner.Scanner
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@ -36,7 +41,7 @@ fn (d Decoder) excerpt(tp token.Position) string {
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// decode_quoted returns an error if `q` is not a valid quoted TOML string.
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fn (d Decoder) decode_quoted(mut q ast.Quoted) ? {
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d.decode_quoted_escapes(mut q) ?
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decode_quoted_escapes(mut q) ?
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}
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// decode_quoted_escapes returns an error for any disallowed escape sequences.
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@ -53,12 +58,9 @@ fn (d Decoder) decode_quoted(mut q ast.Quoted) ? {
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// \\ - backslash (U+005C)
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// \uXXXX - Unicode (U+XXXX)
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// \UXXXXXXXX - Unicode (U+XXXXXXXX)
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fn (d Decoder) decode_quoted_escapes(mut q ast.Quoted) ? {
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pub fn decode_quoted_escapes(mut q ast.Quoted) ? {
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// Setup a scanner in stack memory for easier navigation.
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mut s := scanner.new_simple(q.text) ?
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q.text = q.text.replace('\\"', '"')
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mut eat_whitespace := false
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// TODO use string builder
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mut decoded_s := ''
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// See https://toml.io/en/v1.0.0#string for more info on string types.
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@ -66,6 +68,10 @@ fn (d Decoder) decode_quoted_escapes(mut q ast.Quoted) ? {
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if !is_basic {
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return
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}
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mut s := scanner.new_simple(q.text) ?
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q.text = q.text.replace('\\"', '"')
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for {
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ch := s.next()
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if ch == scanner.end_of_text {
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@ -73,15 +79,28 @@ fn (d Decoder) decode_quoted_escapes(mut q ast.Quoted) ? {
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}
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ch_byte := byte(ch)
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if eat_whitespace && ch_byte.is_space() {
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continue
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}
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eat_whitespace = false
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if ch == `\\` {
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ch_next := byte(s.at())
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ch_next := s.at()
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ch_next_byte := byte(ch_next)
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if ch_next == `\\` {
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decoded_s += ch_next.ascii_str()
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decoded_s += ch_next_byte.ascii_str()
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s.next()
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continue
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}
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if q.is_multiline {
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if ch_next_byte.is_space() {
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eat_whitespace = true
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continue
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}
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}
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if ch_next == `"` {
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decoded_s += '"'
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s.next()
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@ -94,29 +113,74 @@ fn (d Decoder) decode_quoted_escapes(mut q ast.Quoted) ? {
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continue
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}
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escape := ch_byte.ascii_str() + ch_next.ascii_str()
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if ch_next == `t` {
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decoded_s += '\t'
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s.next()
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continue
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}
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if ch_next == `b` {
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decoded_s += '\b'
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s.next()
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continue
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}
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if ch_next == `r` {
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decoded_s += '\r'
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s.next()
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continue
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}
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if ch_next == `f` {
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decoded_s += '\f'
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s.next()
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continue
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}
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escape := ch_byte.ascii_str() + ch_next_byte.ascii_str()
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// Decode unicode escapes
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if escape.to_lower() == '\\u' {
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is_valid_short := byte(s.peek(1)).is_hex_digit() && byte(s.peek(2)).is_hex_digit()
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&& byte(s.peek(3)).is_hex_digit() && byte(s.peek(4)).is_hex_digit()
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if is_valid_short {
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// is_valid_long := byte(s.peek(5)).is_hex_digit() && byte(s.peek(6)).is_hex_digit() && byte(s.peek(7)).is_hex_digit() && byte(s.peek(8)).is_hex_digit()
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// Long type Unicode (\UXXXXXXXX) is a maximum of 10 chars: '\' + 'U' + 8 hex characters
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// we pass in 10 characters from the `u`/`U` which is the longest possible sequence
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// of 9 chars plus one extra.
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mut decoded := ''
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mut sequence_length := 0
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mut unicode_val := 0
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if s.remaining() >= 10 {
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pos := s.state().pos
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decoded = d.decode_unicode_escape(s.text[pos..pos + 11]) or {
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st := s.state()
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' escaped Unicode is invalid. $err.msg.capitalize() ($st.line_nr,$st.col) in ...${d.excerpt(q.pos)}...')
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sequence := s.text[pos..pos + 11]
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decoded, unicode_val, sequence_length = decode_unicode_escape(sequence) or {
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decoded_s += escape
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continue
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}
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if unicode_val > decoder.utf8_max || unicode_val < 0 {
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decoded_s += escape
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continue
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}
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// Check if the Unicode value is actually in the valid Unicode scalar value ranges.
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if !((unicode_val >= 0x0000 && unicode_val <= 0xD7FF)
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|| (unicode_val >= 0xE000 && unicode_val <= decoder.utf8_max)) {
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decoded_s += escape
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continue
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}
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if unicode_val in [0x7F, 0x1F, 0x5C, 0x75] {
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sequence_length -= 2
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}
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decoded_s += decoded
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s.skip_n(s.text[pos..pos + 11].len)
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s.skip_n(s.text[pos..pos + 2 + sequence_length + 1].len)
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continue
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} else {
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pos := s.state().pos
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decoded = d.decode_unicode_escape(s.text[pos..]) or {
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st := s.state()
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' escaped Unicode is invalid. $err.msg.capitalize() ($st.line_nr,$st.col) in ...${d.excerpt(q.pos)}...')
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sequence := s.text[pos..]
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decoded, _, _ = decode_unicode_escape(sequence) or {
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decoded_s += escape
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continue
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}
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decoded_s += decoded
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s.skip_n(s.text[pos..].len)
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@ -124,6 +188,7 @@ fn (d Decoder) decode_quoted_escapes(mut q ast.Quoted) ? {
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}
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}
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}
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}
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decoded_s += ch_byte.ascii_str()
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}
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q.text = decoded_s
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@ -132,10 +197,11 @@ fn (d Decoder) decode_quoted_escapes(mut q ast.Quoted) ? {
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// decode_unicode_escape returns an error if `esc_unicode` is not
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// a valid Unicode escape sequence. `esc_unicode` is expected to be
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// prefixed with either `u` or `U`.
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fn (d Decoder) decode_unicode_escape(esc_unicode string) ?string {
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fn decode_unicode_escape(esc_unicode string) ?(string, int, int) {
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is_long_esc_type := esc_unicode.starts_with('U')
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mut sequence := esc_unicode[1..]
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hex_digits_len := if is_long_esc_type { 8 } else { 4 }
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mut sequence_len := hex_digits_len
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sequence = sequence[..hex_digits_len]
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@ -143,6 +209,7 @@ fn (d Decoder) decode_unicode_escape(esc_unicode string) ?string {
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if unicode_point.len < 8 {
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unicode_point = '0'.repeat(8 - unicode_point.len) + unicode_point
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}
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rn := rune(strconv.parse_int(unicode_point, 16, 0) ?)
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return '$rn'
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i64_val := strconv.parse_int(unicode_point, 16, 0) ?
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rn := rune(i64_val)
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return '$rn', int(i64_val), sequence_len
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}
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@ -1,9 +1,7 @@
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import os
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import toml
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import toml.ast
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import toml.scanner
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import x.json2
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import strconv
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// Instructions for developers:
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// The actual tests and data can be obtained by doing:
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@ -17,22 +15,14 @@ const (
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invalid_exceptions = []string{}
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valid_value_exceptions = [
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// String
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'string/escapes.toml',
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'string/multiline.toml',
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// Integer
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'integer/long.toml',
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// Float
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'float/inf-and-nan.toml',
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// Comment
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'comment/tricky.toml',
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// Table
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'table/array-implicit.toml',
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'table/names.toml',
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// Date-time
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'datetime/milliseconds.toml',
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// Inline-table
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'inline-table/multiline.toml',
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// Key
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'key/escapes.toml',
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]
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