54 lines
1.8 KiB
V
54 lines
1.8 KiB
V
module regex
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import strings
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// compile_opt compile RE pattern string
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pub fn (mut re RE) compile_opt(pattern string) ? {
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re_err, err_pos := re.impl_compile(pattern)
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if re_err != compile_ok {
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mut err_msg := strings.new_builder(300)
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err_msg.write_string('\nquery: $pattern\n')
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line := '-'.repeat(err_pos)
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err_msg.write_string('err : $line^\n')
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err_str := re.get_parse_error_string(re_err)
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err_msg.write_string('ERROR: $err_str\n')
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return error_with_code(err_msg.str(), re_err)
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}
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}
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// new_regex create a RE of small size, usually sufficient for ordinary use
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pub fn new() RE {
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// init regex
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mut re := RE{}
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re.prog = []Token{len: max_code_len + 1} // max program length, can not be longer then the pattern
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re.cc = []CharClass{len: max_code_len} // can not be more char class the the length of the pattern
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re.group_csave_flag = false // enable continuos group saving
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re.group_max_nested = 128 // set max 128 group nested
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re.group_max = max_code_len >> 1 // we can't have more groups than the half of the pattern legth
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re.group_stack = []int{len: re.group_max, init: -1}
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re.group_data = []int{len: re.group_max, init: -1}
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return re
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}
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// regex_opt create new RE object from RE pattern string
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pub fn regex_opt(pattern string) ?RE {
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// init regex
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mut re := RE{}
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re.prog = []Token{len: pattern.len + 1} // max program length, can not be longer then the pattern
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re.cc = []CharClass{len: pattern.len} // can not be more char class the the length of the pattern
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re.group_csave_flag = false // enable continuos group saving
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re.group_max_nested = pattern.len >> 1 // set max 128 group nested
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re.group_max = pattern.len >> 1 // we can't have more groups than the half of the pattern legth
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re.group_stack = []int{len: re.group_max, init: -1}
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re.group_data = []int{len: re.group_max, init: -1}
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// compile the pattern
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re.compile_opt(pattern)?
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return re
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}
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