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242 lines
7.7 KiB
V
242 lines
7.7 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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pub const allowed_basic_escape_chars = [`u`, `U`, `b`, `t`, `n`, `f`, `r`, `"`, `\\`]
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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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else {
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// TODO add more checks to make BurntSushi/toml-test invalid TOML pass
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}
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}
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}
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// excerpt returns a string of the characters surrounding`
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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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fn is_hex_bin_oct(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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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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fn (c Checker) check_number(num ast.Number) ? {
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lit := num.text
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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(lit)
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is_hex := lit.contains('0x')
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is_float := lit.to_lower().all_before('e').contains('.')
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has_exponent_notation := lit.to_lower().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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if is_sign_prefixed { // +/- ...
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n := lit[1..]
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hex_bin_oct = is_hex_bin_oct(n)
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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 ...${c.excerpt(num.pos)}...')
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}
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// is_first_digit = byte(n[0]).is_digit()
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if lit.len > 1 && n.starts_with('0') {
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ascii = byte(n[0]).ascii_str()
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$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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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, [`_`, `.`, `x`, `o`, `b`]) {
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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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third := lit[2]
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if third in scanner.digit_extras {
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ascii = byte(third).ascii_str()
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" (hex, octal and binary) can not have `$ascii` in ...${c.excerpt(num.pos)}...')
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}
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}
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if has_exponent_notation {
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if lit.to_lower().all_after('e').contains('.') {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" (with exponent) can not have a decimal point in ...${c.excerpt(num.pos)}...')
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}
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if !is_hex && lit.to_lower().count('e') > 1 {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$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 start 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.contains('e.') || lit.contains('.e') || lit.contains('E.') || lit.contains('.E') {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' numbers like "$lit" (float) can not have underscores before or after the decimal point in ...${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 [`x`, `o`, `b`] {
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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 ...${c.excerpt(num.pos)}...')
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}
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}
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}
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fn (c Checker) check_boolean(b ast.Bool) ? {
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lit := b.text
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if lit in ['true', 'false'] {
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return
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}
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' boolean values like "$lit" can only be `true` or `false` literals, not `$lit` in ...${c.excerpt(b.pos)}...')
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}
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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 "$lit" is has unbalanced quote literals `q.quote` in ...${c.excerpt(q.pos)}...')
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}
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c.check_quoted_escapes(q) ?
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}
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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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is_basic := q.quote == `\"`
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for {
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ch := s.next()
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if ch == -1 {
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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) && 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)}...')
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}
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if next_ch in [`\t`, `\n`, ` `] {
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s.next()
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continue
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}
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}
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if next_ch !in checker.allowed_basic_escape_chars {
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st := s.state()
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' unknown basic string escape character `$next_ch.ascii_str()` in `$escape` ($st.line_nr,$st.col) in ...${c.excerpt(q.pos)}...')
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}
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}
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}
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}
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}
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