71 lines
1.5 KiB
Rust
71 lines
1.5 KiB
Rust
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use super::types::ParseResult;
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pub(super) fn digit(chr : u8) -> bool {
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let zero = b'0' as u8;
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let nine = b'9' as u8;
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let between_zero_and_nine = (chr >= zero) && (nine >= chr);
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return between_zero_and_nine
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}
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pub(super) fn take_until<'a>(word : &'a str, pattern : u8) -> ParseResult<'a> {
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let mut new_start = 0;
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for chr in word.as_bytes() {
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if (*chr == pattern) {
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break
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}
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else {
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new_start += 1;
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}
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}
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return
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ParseResult{
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matched : &word[0..new_start],
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residual : &word[new_start..]
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};
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}
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pub(super) fn take_while<'a>(word : &'a str, cond : fn(u8) -> bool) -> ParseResult<'a> {
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let mut new_start = 0;
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for chr in word.as_bytes() {
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if (cond(*chr)) {
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new_start += 1;
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}
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else {
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break
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}
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}
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return
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ParseResult{
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matched : &word[0..new_start],
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residual : &word[new_start..]
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};
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}
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pub(super) fn tag<'a>(word : &'a str, pattern : &'a str) -> ParseResult<'a> {
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let lhs = word.as_bytes().iter();
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let rhs = pattern.as_bytes();
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let iter = lhs.zip(rhs);
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let mut new_start = 0;
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let mut res = true;
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for (c_lhs, c_rhs) in iter {
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res = res && (c_lhs == c_rhs);
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if !res {break}
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new_start += 1;
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}
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return
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ParseResult{
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matched : &word[0..new_start],
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residual : &word[new_start..]
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};
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}
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