242 lines
7.7 KiB
V
242 lines
7.7 KiB
V
// Copyright (c) 2021 Lars Pontoppidan. All rights reserved.
|
|
// Use of this source code is governed by an MIT license
|
|
// that can be found in the LICENSE file.
|
|
module checker
|
|
|
|
import toml.ast
|
|
import toml.ast.walker
|
|
// import toml.util
|
|
import toml.token
|
|
import toml.scanner
|
|
|
|
pub const allowed_basic_escape_chars = [`u`, `U`, `b`, `t`, `n`, `f`, `r`, `"`, `\\`]
|
|
|
|
// Checker checks a tree of TOML `ast.Value`'s for common errors.
|
|
pub struct Checker {
|
|
scanner &scanner.Scanner
|
|
}
|
|
|
|
// check checks the `ast.Value` and all it's children
|
|
// for common errors.
|
|
pub fn (c Checker) check(n &ast.Value) ? {
|
|
walker.walk(c, n) ?
|
|
}
|
|
|
|
fn (c Checker) visit(value &ast.Value) ? {
|
|
match value {
|
|
ast.Bool {
|
|
c.check_boolean(value) ?
|
|
}
|
|
ast.Number {
|
|
c.check_number(value) ?
|
|
}
|
|
ast.Quoted {
|
|
c.check_quoted(value) ?
|
|
}
|
|
else {
|
|
// TODO add more checks to make BurntSushi/toml-test invalid TOML pass
|
|
}
|
|
}
|
|
}
|
|
|
|
// excerpt returns a string of the characters surrounding`
|
|
fn (c Checker) excerpt(tp token.Position) string {
|
|
return c.scanner.excerpt(tp.pos, 10)
|
|
}
|
|
|
|
fn is_hex_bin_oct(hbo string) bool {
|
|
return hbo.len > 2 && (hbo.starts_with('0x') || hbo.starts_with('0o') || hbo.starts_with('0b'))
|
|
}
|
|
|
|
fn has_repeating(str string, repeats []rune) bool {
|
|
for i, r in str {
|
|
if r in repeats && i + 1 < str.len {
|
|
if r == str[i + 1] {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
fn (c Checker) check_number(num ast.Number) ? {
|
|
lit := num.text
|
|
if lit in ['0', '0.0', '+0', '-0', '+0.0', '-0.0', '0e0', '+0e0', '-0e0', '0e00'] {
|
|
return
|
|
}
|
|
|
|
if lit.contains('_') {
|
|
if lit.starts_with('_') || lit.ends_with('_') {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" can not start or end with `_` in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
if lit.contains('__') {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" can not have more than one underscore (`_`) in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
}
|
|
|
|
mut hex_bin_oct := is_hex_bin_oct(lit)
|
|
is_hex := lit.contains('0x')
|
|
is_float := lit.to_lower().all_before('e').contains('.')
|
|
has_exponent_notation := lit.to_lower().contains('e')
|
|
float_decimal_index := lit.index('.') or { -1 }
|
|
// mut is_first_digit := byte(lit[0]).is_digit()
|
|
mut ascii := byte(lit[0]).ascii_str()
|
|
is_sign_prefixed := lit[0] in [`+`, `-`]
|
|
if is_sign_prefixed { // +/- ...
|
|
n := lit[1..]
|
|
hex_bin_oct = is_hex_bin_oct(n)
|
|
if hex_bin_oct {
|
|
ascii = byte(lit[0]).ascii_str()
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" (hex, octal and binary) can not start with `$ascii` in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
// is_first_digit = byte(n[0]).is_digit()
|
|
if lit.len > 1 && n.starts_with('0') {
|
|
ascii = byte(n[0]).ascii_str()
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" can not start with `$ascii` in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
} else {
|
|
if !hex_bin_oct {
|
|
if !is_float && lit[0] == `0` {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" can not start with a zero in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
|
|
if is_float && lit[0] == `0` && float_decimal_index > 1 {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" can not start with a zero in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
}
|
|
}
|
|
|
|
if has_repeating(lit, [`_`, `.`, `x`, `o`, `b`]) {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" can not have $scanner.digit_extras as repeating characters in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
|
|
if hex_bin_oct {
|
|
third := lit[2]
|
|
if third in scanner.digit_extras {
|
|
ascii = byte(third).ascii_str()
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" (hex, octal and binary) can not have `$ascii` in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
}
|
|
|
|
if has_exponent_notation {
|
|
if lit.to_lower().all_after('e').contains('.') {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" (with exponent) can not have a decimal point in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
if !is_hex && lit.to_lower().count('e') > 1 {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" (with exponent) can only have one exponent in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
}
|
|
|
|
if is_float {
|
|
if lit.count('.') > 1 {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" (float) can only have one decimal point in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
last := lit[lit.len - 1]
|
|
if last in scanner.digit_extras {
|
|
ascii = byte(last).ascii_str()
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" (float) can not start with `$ascii` in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
if lit.contains('_.') || lit.contains('._') {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" (float) can not have underscores before or after the decimal point in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
if lit.contains('e.') || lit.contains('.e') || lit.contains('E.') || lit.contains('.E') {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" (float) can not have underscores before or after the decimal point in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
} else {
|
|
if lit.len > 1 && lit.starts_with('0') && lit[1] !in [`x`, `o`, `b`] {
|
|
ascii = byte(lit[0]).ascii_str()
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' numbers like "$lit" can not start with `$ascii` in ...${c.excerpt(num.pos)}...')
|
|
}
|
|
}
|
|
}
|
|
|
|
fn (c Checker) check_boolean(b ast.Bool) ? {
|
|
lit := b.text
|
|
if lit in ['true', 'false'] {
|
|
return
|
|
}
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' boolean values like "$lit" can only be `true` or `false` literals, not `$lit` in ...${c.excerpt(b.pos)}...')
|
|
}
|
|
|
|
fn (c Checker) check_quoted(q ast.Quoted) ? {
|
|
lit := q.text
|
|
quote := q.quote.ascii_str()
|
|
triple_quote := quote + quote + quote
|
|
if q.is_multiline && lit.ends_with(triple_quote) {
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' string values like "$lit" is has unbalanced quote literals `q.quote` in ...${c.excerpt(q.pos)}...')
|
|
}
|
|
c.check_quoted_escapes(q) ?
|
|
}
|
|
|
|
// check_quoted_escapes returns an error for any disallowed escape sequences.
|
|
// Delimiters in TOML has significant meaning:
|
|
// '/''' delimits *literal* strings (WYSIWYG / What-you-see-is-what-you-get)
|
|
// "/""" delimits *basic* strings
|
|
// Allowed escapes in *basic* strings are:
|
|
// \b - backspace (U+0008)
|
|
// \t - tab (U+0009)
|
|
// \n - linefeed (U+000A)
|
|
// \f - form feed (U+000C)
|
|
// \r - carriage return (U+000D)
|
|
// \" - quote (U+0022)
|
|
// \\ - backslash (U+005C)
|
|
// \uXXXX - unicode (U+XXXX)
|
|
// \UXXXXXXXX - unicode (U+XXXXXXXX)
|
|
fn (c Checker) check_quoted_escapes(q ast.Quoted) ? {
|
|
// Setup a scanner in stack memory for easier navigation.
|
|
mut s := scanner.new_simple(q.text) ?
|
|
|
|
is_basic := q.quote == `\"`
|
|
for {
|
|
ch := s.next()
|
|
if ch == -1 {
|
|
break
|
|
}
|
|
ch_byte := byte(ch)
|
|
if ch == `\\` {
|
|
next_ch := byte(s.at())
|
|
|
|
if next_ch == `\\` {
|
|
s.next()
|
|
continue
|
|
}
|
|
escape := ch_byte.ascii_str() + next_ch.ascii_str()
|
|
if is_basic {
|
|
if q.is_multiline {
|
|
if next_ch == byte(32) && s.peek(1) == byte(92) {
|
|
st := s.state()
|
|
return error(@MOD + '.' + @STRUCT + '.' + @FN +
|
|
' can not escape whitespaces before escapes 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)}...')
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|