567 lines
19 KiB
V
567 lines
19 KiB
V
// Copyright (c) 2021 Lars Pontoppidan. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module checker
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import toml.ast
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import toml.ast.walker
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import toml.util
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import toml.token
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import toml.scanner
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import encoding.utf8
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import time
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import strconv
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pub const allowed_basic_escape_chars = [`u`, `U`, `b`, `t`, `n`, `f`, `r`, `"`, `\\`]
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// utf8_max is the largest inclusive value of the Unicodes scalar value ranges.
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const utf8_max = 0x10FFFF
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// Checker checks a tree of TOML `ast.Value`'s for common errors.
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pub struct Checker {
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scanner &scanner.Scanner
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}
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// check checks the `ast.Value` and all it's children
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// for common errors.
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pub fn (c Checker) check(n &ast.Value) ? {
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walker.walk(c, n) ?
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}
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fn (c Checker) visit(value &ast.Value) ? {
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match value {
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ast.Bool {
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c.check_boolean(value) ?
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}
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ast.Number {
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c.check_number(value) ?
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}
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ast.Quoted {
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c.check_quoted(value) ?
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}
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ast.DateTime {
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c.check_date_time(value) ?
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}
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ast.Date {
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c.check_date(value) ?
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}
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ast.Time {
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c.check_time(value) ?
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}
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else {}
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}
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}
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// excerpt returns a string of the token's surroundings
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fn (c Checker) excerpt(tp token.Position) string {
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return c.scanner.excerpt(tp.pos, 10)
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}
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// is_hex_bin_oct_prefixed returns true if `hbo` has either
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// of: `0x`, `0o` or `0b` - as a prefix.
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// Example: assert is_hex_bin_oct_prefixed('0xAF') == true
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// Example: assert is_hex_bin_oct_prefixed('xAF') == false
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fn is_hex_bin_oct_prefixed(hbo string) bool {
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return hbo.len > 2 && (hbo.starts_with('0x') || hbo.starts_with('0o') || hbo.starts_with('0b'))
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}
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// has_repeating returns true if `str` has one or more repeating
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// `rune` characters provided in `repeats`.
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// Example: assert has_repeating('hello__v.', [`.`,`_`]) == true
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// Example: assert has_repeating('hello_v.', [`.`,`_`]) == false
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fn has_repeating(str string, repeats []rune) bool {
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for i, r in str {
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if r in repeats && i + 1 < str.len {
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if r == str[i + 1] {
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return true
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}
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}
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}
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return false
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}
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// check_number returns an error if `num` is not a valid TOML number.
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fn (c Checker) check_number(num ast.Number) ? {
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lit := num.text
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lit_lower_case := lit.to_lower()
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if lit in ['0', '0.0', '+0', '-0', '+0.0', '-0.0', '0e0', '+0e0', '-0e0', '0e00'] {
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return
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}
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if lit.contains('_') {
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if lit.starts_with('_') || lit.ends_with('_') {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" can not start or end with `_` in ...${c.excerpt(num.pos)}...')
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}
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if lit.contains('__') {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" can not have more than one underscore (`_`) in ...${c.excerpt(num.pos)}...')
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}
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}
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mut hex_bin_oct := is_hex_bin_oct_prefixed(lit)
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mut is_bin, mut is_oct, mut is_hex := false, false, false
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is_float := lit_lower_case.all_before('e').contains('.')
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has_exponent_notation := lit_lower_case.contains('e')
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float_decimal_index := lit.index('.') or { -1 }
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// mut is_first_digit := byte(lit[0]).is_digit()
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mut ascii := byte(lit[0]).ascii_str()
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is_sign_prefixed := lit[0] in [`+`, `-`]
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mut lit_sans_sign := lit
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if is_sign_prefixed { // +/- ...
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lit_sans_sign = lit[1..]
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hex_bin_oct = is_hex_bin_oct_prefixed(lit_sans_sign)
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if hex_bin_oct {
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ascii = byte(lit[0]).ascii_str()
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" (hex, octal and binary) can not start with `$ascii` in ...${c.excerpt(num.pos)}...')
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}
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if lit.len > 1 && lit_sans_sign.starts_with('0') && !lit_sans_sign.starts_with('0.') {
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ascii = byte(lit_sans_sign[0]).ascii_str()
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" can not start with `$ascii` in ...${c.excerpt(num.pos)}...')
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}
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} else {
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if !hex_bin_oct {
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if !is_float && lit[0] == `0` {
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if lit[1] in [`B`, `O`, `X`] {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" only lowercase notation in ...${c.excerpt(num.pos)}...')
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}
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" can not start with a zero in ...${c.excerpt(num.pos)}...')
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}
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if is_float && lit[0] == `0` && float_decimal_index > 1 {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" can not start with a zero in ...${c.excerpt(num.pos)}...')
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}
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}
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}
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if has_repeating(lit, [`_`, `.`, `b`, `o`, `x`]) {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" can not have $scanner.digit_extras as repeating characters in ...${c.excerpt(num.pos)}...')
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}
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if hex_bin_oct {
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is_bin = lit_sans_sign.starts_with('0b')
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is_oct = lit_sans_sign.starts_with('0o')
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is_hex = lit_sans_sign.starts_with('0x')
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lit_sans_sign_and_type_prefix := lit_sans_sign[2..]
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if lit_sans_sign_and_type_prefix.starts_with('_')
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|| lit_sans_sign_and_type_prefix.ends_with('_') {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" can not start or end with `_` in ...${c.excerpt(num.pos)}...')
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}
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if is_bin {
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if !c.is_valid_binary_literal(lit_sans_sign_and_type_prefix) {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' "$lit" is not a valid binary number in ...${c.excerpt(num.pos)}...')
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}
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} else if is_oct {
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if !c.is_valid_octal_literal(lit_sans_sign_and_type_prefix) {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' "$lit" is not a valid octal number in ...${c.excerpt(num.pos)}...')
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}
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} else {
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if !c.is_valid_hex_literal(lit_sans_sign_and_type_prefix) {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' "$lit" is not a valid hexadecimal number in ...${c.excerpt(num.pos)}...')
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}
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}
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}
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if has_exponent_notation {
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if lit_lower_case.all_after('e').starts_with('_')
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|| lit_lower_case.all_before('e').ends_with('_') {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' the exponent in "$lit" can not start nor end with an underscore in ...${c.excerpt(num.pos)}...')
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}
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if lit_lower_case.all_after('e').contains('.') {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" (with exponent) can not have a decimal point in ...${c.excerpt(num.pos)}...')
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}
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if !is_hex && lit_lower_case.count('e') > 1 {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" (with exponent) can only have one exponent in ...${c.excerpt(num.pos)}...')
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}
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}
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if is_float {
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if lit.count('.') > 1 {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" (float) can only have one decimal point in ...${c.excerpt(num.pos)}...')
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}
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last := lit[lit.len - 1]
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if last in scanner.digit_extras {
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ascii = byte(last).ascii_str()
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" (float) can not end with `$ascii` in ...${c.excerpt(num.pos)}...')
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}
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if lit.contains('_.') || lit.contains('._') {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" (float) can not have underscores before or after the decimal point in ...${c.excerpt(num.pos)}...')
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}
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if lit_lower_case.contains('e.') || lit.contains('.e') {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" (float) can not have decimal points on either side of the exponent notation in ...${c.excerpt(num.pos)}...')
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}
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} else {
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if lit.len > 1 && lit.starts_with('0') && lit[1] !in [`b`, `o`, `x`] {
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ascii = byte(lit[0]).ascii_str()
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" can not start with `$ascii` in ...${c.excerpt(num.pos)}...')
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}
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}
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}
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// is_valid_binary_literal returns true if `num` is valid TOML binary literal.
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fn (c Checker) is_valid_binary_literal(num string) bool {
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for ch in num {
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if ch == `_` {
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continue
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}
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if !(ch >= `0` && ch <= `1`) {
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return false
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}
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}
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return true
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}
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// is_valid_octal_literal returns true if `num` is valid TOML octal literal.
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fn (c Checker) is_valid_octal_literal(num string) bool {
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for ch in num {
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if ch == `_` {
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continue
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}
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if !(ch >= `0` && ch <= `7`) {
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return false
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}
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}
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return true
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}
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// is_valid_hex_literal returns true if `num` is valid TOML hexadecimal literal.
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fn (c Checker) is_valid_hex_literal(num string) bool {
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for ch in num {
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if ch == `_` {
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continue
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}
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if !ch.is_hex_digit() {
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return false
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}
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}
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return true
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}
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// check_boolean returns an error if `b` is not a valid TOML boolean.
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fn (c Checker) check_boolean(b ast.Bool) ? {
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lit := b.text
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if lit in ['true', 'false'] {
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return
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}
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' boolean values like "$lit" can only be `true` or `false` literals, not `$lit` in ...${c.excerpt(b.pos)}...')
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}
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// check_date_time returns an error if `dt` is not a valid TOML date-time string (RFC 3339).
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// See also https://ijmacd.github.io/rfc3339-iso8601 for a more
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// visual representation of the RFC 3339 format.
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fn (c Checker) check_date_time(dt ast.DateTime) ? {
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lit := dt.text
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mut split := []string{}
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// RFC 3339 Date-Times can be split via 4 separators (` `, `_`, `T` and `t`).
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if lit.to_lower().contains_any(' _t') {
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if lit.contains(' ') {
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split = lit.split(' ')
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} else if lit.contains('_') {
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split = lit.split('_')
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} else if lit.contains('T') {
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split = lit.split('T')
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} else if lit.contains('t') {
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split = lit.split('t')
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}
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// Validate the split into date and time parts.
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if split.len != 2 {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' "$lit" contains too many date/time separators in ...${c.excerpt(dt.pos)}...')
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}
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// Re-use date and time validation code for detailed testing of each part
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c.check_date(ast.Date{
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text: split[0]
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pos: token.Position{
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len: split[0].len
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line_nr: dt.pos.line_nr
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pos: dt.pos.pos
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col: dt.pos.col
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}
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}) ?
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c.check_time(ast.Time{
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text: split[1]
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pos: token.Position{
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len: split[1].len
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line_nr: dt.pos.line_nr
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pos: dt.pos.pos + split[0].len
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col: dt.pos.col + split[0].len
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}
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}) ?
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// Use V's builtin functionality to validate the string
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time.parse_rfc3339(lit) or {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' "$lit" is not a valid RFC 3339 Date-Time format string "$err". In ...${c.excerpt(dt.pos)}...')
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}
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} else {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' "$lit" is not a valid RFC 3339 Date-Time format string in ...${c.excerpt(dt.pos)}...')
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}
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}
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// check_time returns an error if `date` is not a valid TOML date string (RFC 3339).
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fn (c Checker) check_date(date ast.Date) ? {
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lit := date.text
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parts := lit.split('-')
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if parts.len != 3 {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' "$lit" is not a valid RFC 3339 Date format string in ...${c.excerpt(date.pos)}...')
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}
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yyyy := parts[0]
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if yyyy.len != 4 {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' "$lit" does not have a valid RFC 3339 year indication in ...${c.excerpt(date.pos)}...')
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}
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mm := parts[1]
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if mm.len != 2 {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' "$lit" does not have a valid RFC 3339 month indication in ...${c.excerpt(date.pos)}...')
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}
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dd := parts[2]
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if dd.len != 2 {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' "$lit" does not have a valid RFC 3339 day indication in ...${c.excerpt(date.pos)}...')
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}
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// Use V's builtin functionality to validate the string
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time.parse_rfc3339(lit) or {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' "$lit" is not a valid RFC 3339 Date format string "$err". In ...${c.excerpt(date.pos)}...')
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}
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}
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// check_time returns an error if `t` is not a valid TOML time string (RFC 3339).
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fn (c Checker) check_time(t ast.Time) ? {
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lit := t.text
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// Split any offsets from the time
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mut offset_splitter := if lit.contains('+') { '+' } else { '-' }
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parts := lit.split(offset_splitter)
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mut hhmmss := parts[0].all_before('.')
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// Check for 2 digits in all fields
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mut check_length := 8
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if hhmmss.to_upper().ends_with('Z') {
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check_length++
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}
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if hhmmss.len != check_length {
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starts_with_zero := hhmmss.starts_with('0')
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if !starts_with_zero {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' "$lit" must be zero prefixed in ...${c.excerpt(t.pos)}...')
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}
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' "$lit" is not a valid RFC 3339 Time format string in ...${c.excerpt(t.pos)}...')
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}
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// Use V's builtin functionality to validate the time string
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time.parse_rfc3339(parts[0]) or {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' "$lit" is not a valid RFC 3339 Time format string "$err". In ...${c.excerpt(t.pos)}...')
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}
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}
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// check_quoted returns an error if `q` is not a valid quoted TOML string.
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pub fn (c Checker) check_quoted(q ast.Quoted) ? {
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lit := q.text
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quote := q.quote.ascii_str()
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triple_quote := quote + quote + quote
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if q.is_multiline && lit.ends_with(triple_quote) {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' string values like "$lit" has unbalanced quote literals `q.quote` in ...${c.excerpt(q.pos)}...')
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}
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c.check_quoted_escapes(q) ?
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c.check_utf8_validity(q) ?
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}
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// check_quoted_escapes returns an error for any disallowed escape sequences.
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// Delimiters in TOML has significant meaning:
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// '/''' delimits *literal* strings (WYSIWYG / What-you-see-is-what-you-get)
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// "/""" delimits *basic* strings
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// Allowed escapes in *basic* strings are:
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// \b - backspace (U+0008)
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// \t - tab (U+0009)
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// \n - linefeed (U+000A)
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// \f - form feed (U+000C)
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// \r - carriage return (U+000D)
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// \" - quote (U+0022)
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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 (c Checker) check_quoted_escapes(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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// See https://toml.io/en/v1.0.0#string for more info on string types.
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is_basic := q.quote == `\"`
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contains_newlines := q.text.contains('\n')
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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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break
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}
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ch_byte := byte(ch)
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if ch == `\\` {
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next_ch := byte(s.at())
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if next_ch == `\\` {
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s.next()
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continue
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}
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escape := ch_byte.ascii_str() + next_ch.ascii_str()
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if is_basic {
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if q.is_multiline {
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if next_ch == byte(32) {
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if s.peek(1) == byte(92) {
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st := s.state()
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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|
' can not escape whitespaces before escapes in multi-line strings (`\\ \\`) at `$escape` ($st.line_nr,$st.col) in ...${c.excerpt(q.pos)}...')
|
|
}
|
|
if !contains_newlines {
|
|
st := s.state()
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' can not escape whitespaces in multi-line strings (`\\ `) at `$escape` ($st.line_nr,$st.col) in ...${c.excerpt(q.pos)}...')
|
|
}
|
|
}
|
|
if next_ch in [`\t`, `\n`, ` `] {
|
|
s.next()
|
|
continue
|
|
}
|
|
}
|
|
if next_ch !in checker.allowed_basic_escape_chars {
|
|
st := s.state()
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' unknown basic string escape character `$next_ch.ascii_str()` in `$escape` ($st.line_nr,$st.col) in ...${c.excerpt(q.pos)}...')
|
|
}
|
|
}
|
|
// Check Unicode escapes
|
|
if is_basic && escape.to_lower() == '\\u' {
|
|
// Long type Unicode (\UXXXXXXXX) is a maximum of 10 chars: '\' + 'U' + 8 hex characters
|
|
// we pass in 10 characters from the `u`/`U` which is the longest possible sequence
|
|
// of 9 chars plus one extra.
|
|
if s.remaining() >= 10 {
|
|
pos := s.state().pos
|
|
c.check_unicode_escape(s.text[pos..pos + 11]) or {
|
|
st := s.state()
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' escaped Unicode is invalid. $err.msg.capitalize() ($st.line_nr,$st.col) in ...${c.excerpt(q.pos)}...')
|
|
}
|
|
} else {
|
|
pos := s.state().pos
|
|
c.check_unicode_escape(s.text[pos..]) or {
|
|
st := s.state()
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' escaped Unicode is invalid. $err.msg.capitalize() ($st.line_nr,$st.col) in ...${c.excerpt(q.pos)}...')
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// check_utf8_string returns an error if `str` is not valid UTF-8.
|
|
fn (c Checker) check_utf8_validity(q ast.Quoted) ? {
|
|
lit := q.text
|
|
if !utf8.validate_str(lit) {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' the string value "$lit" is not valid UTF-8 in ...${c.excerpt(q.pos)}...')
|
|
}
|
|
}
|
|
|
|
// validate_utf8_codepoint_string returns an error if `str` is not a valid Unicode code point.
|
|
// `str` is expected to be a `string` containing *only* hex values.
|
|
// Any preludes or prefixes like `0x` could pontentially yield wrong results.
|
|
fn validate_utf8_codepoint_string(str string) ? {
|
|
int_val := strconv.parse_int(str, 16, 64) or { i64(-1) }
|
|
if int_val > checker.utf8_max || int_val < 0 {
|
|
return error('Unicode code point `$str` is outside the valid Unicode scalar value ranges.')
|
|
}
|
|
// Check if the Unicode value is actually in the valid Unicode scalar value ranges.
|
|
// TODO should probably be transferred / implemented in `utf8.validate(...)` also?
|
|
if !((int_val >= 0x0000 && int_val <= 0xD7FF) || (int_val >= 0xE000 && int_val <= 0x10FFFF)) {
|
|
return error('Unicode code point `$str` is not a valid Unicode scalar value.')
|
|
}
|
|
bytes := str.bytes()
|
|
if !utf8.validate(bytes.data, bytes.len) {
|
|
return error('Unicode code point `$str` is not a valid UTF-8 code point.')
|
|
}
|
|
}
|
|
|
|
// check_unicode_escape returns an error if `esc_unicode` is not
|
|
// a valid Unicode escape sequence. `esc_unicode` is expected to be
|
|
// prefixed with either `u` or `U`.
|
|
fn (c Checker) check_unicode_escape(esc_unicode string) ? {
|
|
if esc_unicode.len < 5 || !esc_unicode.to_lower().starts_with('u') {
|
|
// Makes sure the input to this function is actually valid.
|
|
return error('`$esc_unicode` is not a valid escaped Unicode sequence.')
|
|
}
|
|
is_long_esc_type := esc_unicode.starts_with('U')
|
|
mut sequence := esc_unicode[1..]
|
|
hex_digits_len := if is_long_esc_type { 8 } else { 4 }
|
|
if sequence.len < hex_digits_len {
|
|
return error('Unicode escape sequence `$esc_unicode` should be at least $hex_digits_len in length.')
|
|
}
|
|
sequence = sequence[..hex_digits_len]
|
|
// TODO not enforced in BurnSushi testsuite??
|
|
// if !sequence.is_upper() {
|
|
// return error('Unicode escape sequence `$esc_unicode` is not in all uppercase.')
|
|
//}
|
|
validate_utf8_codepoint_string(sequence.to_upper()) ?
|
|
if is_long_esc_type {
|
|
// Long escape type checks
|
|
} else {
|
|
// Short escape type checks
|
|
}
|
|
}
|
|
|
|
// check_comment returns an error if the contents of `comment` isn't
|
|
// a valid TOML comment.
|
|
pub fn (c Checker) check_comment(comment ast.Comment) ? {
|
|
lit := comment.text
|
|
// Setup a scanner in stack memory for easier navigation.
|
|
mut s := scanner.new_simple(lit) ?
|
|
for {
|
|
ch := s.next()
|
|
if ch == scanner.end_of_text {
|
|
break
|
|
}
|
|
ch_byte := byte(ch)
|
|
// Check for carrige return
|
|
if ch_byte == 0x0D {
|
|
st := s.state()
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' carrige return character `$ch_byte.hex()` is not allowed ($st.line_nr,$st.col) "${byte(s.at()).ascii_str()}" near ...${s.excerpt(st.pos, 10)}...')
|
|
}
|
|
// Check for control characters (allow TAB)
|
|
if util.is_illegal_ascii_control_character(ch_byte) {
|
|
st := s.state()
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' control character `$ch_byte.hex()` is not allowed ($st.line_nr,$st.col) "${byte(s.at()).ascii_str()}" near ...${s.excerpt(st.pos, 10)}...')
|
|
}
|
|
}
|
|
|
|
// Check for bad UTF-8 encoding
|
|
if !utf8.validate_str(lit) {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' comment "$lit" is not valid UTF-8 in ...${c.excerpt(comment.pos)}...')
|
|
}
|
|
}
|