v/vlib/regex/regex.v

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/**********************************************************************
*
* regex 0.9e
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*
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* Copyright (c) 2019-2020 Dario Deledda. All rights reserved.
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* Use of this source code is governed by an MIT license
* that can be found in the LICENSE file.
*
* This file contains regex module
*
* Know limitation:
* - find is implemented in a trivial way
* - not full compliant PCRE
* - not compliant POSIX ERE
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*
*
**********************************************************************/
module regex
import strings
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pub const(
v_regex_version = "0.9e" // regex module version
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max_code_len = 256 // default small base code len for the regex programs
max_quantifier = 1073741824 // default max repetitions allowed for the quantifiers = 2^30
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// spaces chars (here only westerns!!) TODO: manage all the spaces from unicode
spaces = [` `, `\t`, `\n`, `\r`, `\v`, `\f`]
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// new line chars for now only '\n'
new_line_list = [`\n`,`\r`]
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// Results
no_match_found = -1
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// Errors
compile_ok = 0 // the regex string compiled, all ok
err_char_unknown = -2 // the char used is unknow to the system
err_undefined = -3 // the compiler symbol is undefined
err_internal_error = -4 // Bug in the regex system!!
err_cc_alloc_overflow = -5 // memory for char class full!!
err_syntax_error = -6 // syntax error in regex compiling
err_groups_overflow = -7 // max number of groups reached
err_groups_max_nested = -8 // max number of nested group reached
err_group_not_balanced = -9 // group not balanced
err_group_qm_notation = -10 // group invalid notation
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)
const(
//*************************************
// regex program instructions
//*************************************
ist_simple_char = u32(0x7FFFFFFF) // single char instruction, 31 bit available to char
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// char class 11 0100 AA xxxxxxxx
// AA = 00 regular class
// AA = 01 Negated class ^ char
ist_char_class = 0xD1000000 // MASK
ist_char_class_pos = 0xD0000000 // char class normal [abc]
ist_char_class_neg = 0xD1000000 // char class negate [^abc]
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// dot char 10 0110 xx xxxxxxxx
ist_dot_char = 0x98000000 // match any char except \n
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// backslash chars 10 0100 xx xxxxxxxx
ist_bsls_char = 0x90000000 // backslash char
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// OR | 10 010Y xx xxxxxxxx
ist_or_branch = 0x91000000 // OR case
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// groups 10 010Y xx xxxxxxxx
ist_group_start = 0x92000000 // group start (
ist_group_end = 0x94000000 // group end )
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// control instructions
ist_prog_end = u32(0x88000000) //10 0010 xx xxxxxxxx
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//*************************************
)
/******************************************************************************
*
* General Utilities
*
******************************************************************************/
// utf8util_char_len calculate the length in bytes of a utf8 char
[inline]
fn utf8util_char_len(b byte) int {
return (( 0xe5000000 >> (( b >> 3 ) & 0x1e )) & 3 ) + 1
}
// get_char get a char from position i and return an u32 with the unicode code
[inline]
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fn (re RE) get_char(in_txt string, i int) (u32,int) {
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// ascii 8 bit
if (re.flag & f_bin) !=0 ||
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in_txt.str[i] & 0x80 == 0
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{
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return u32(in_txt.str[i]), 1
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}
// unicode char
char_len := utf8util_char_len(in_txt.str[i])
mut tmp := 0
mut ch := u32(0)
for tmp < char_len {
ch = (ch << 8) | in_txt.str[i+tmp]
tmp++
}
return ch,char_len
}
// get_charb get a char from position i and return an u32 with the unicode code
[inline]
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fn (re RE) get_charb(in_txt byteptr, i int) (u32,int) {
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// ascii 8 bit
if (re.flag & f_bin) !=0 ||
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in_txt[i] & 0x80 == 0
{
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return u32(in_txt[i]), 1
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}
// unicode char
char_len := utf8util_char_len(in_txt[i])
mut tmp := 0
mut ch := u32(0)
for tmp < char_len {
ch = (ch << 8) | in_txt[i+tmp]
tmp++
}
return ch,char_len
}
[inline]
fn is_alnum(in_char byte) bool {
mut tmp := in_char - `A`
if tmp >= 0x00 && tmp <= 25 { return true }
tmp = in_char - `a`
if tmp >= 0x00 && tmp <= 25 { return true }
tmp = in_char - `0`
if tmp >= 0x00 && tmp <= 9 { return true }
if tmp == `_` { return true }
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return false
}
[inline]
fn is_not_alnum(in_char byte) bool {
return !is_alnum(in_char)
}
[inline]
fn is_space(in_char byte) bool {
return in_char in spaces
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}
[inline]
fn is_not_space(in_char byte) bool {
return !is_space(in_char)
}
[inline]
fn is_digit(in_char byte) bool {
tmp := in_char - `0`
return tmp <= 0x09 && tmp >= 0
}
[inline]
fn is_not_digit(in_char byte) bool {
return !is_digit(in_char)
}
[inline]
fn is_wordchar(in_char byte) bool {
return is_alnum(in_char) || in_char == `_`
}
[inline]
fn is_not_wordchar(in_char byte) bool {
return !is_alnum(in_char)
}
[inline]
fn is_lower(in_char byte) bool {
tmp := in_char - `a`
return tmp >= 0x00 && tmp <= 25
}
[inline]
fn is_upper(in_char byte) bool {
tmp := in_char - `A`
return tmp >= 0x00 && tmp <= 25
}
pub fn (re RE) get_parse_error_string(err int) string {
match err {
compile_ok { return "compile_ok" }
no_match_found { return "no_match_found" }
err_char_unknown { return "err_char_unknown" }
err_undefined { return "err_undefined" }
err_internal_error { return "err_internal_error" }
err_cc_alloc_overflow { return "err_cc_alloc_overflow" }
err_syntax_error { return "err_syntax_error" }
err_groups_overflow { return "err_groups_overflow" }
err_groups_max_nested { return "err_groups_max_nested" }
err_group_not_balanced { return "err_group_not_balanced" }
err_group_qm_notation { return "err_group_qm_notation" }
else { return "err_unknown" }
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}
}
// utf8_str convert and utf8 sequence to a printable string
[inline]
fn utf8_str(ch u32) string {
mut i := 4
mut res := ""
for i > 0 {
v := byte((ch >> ((i-1)*8)) & 0xFF)
if v != 0{
res += "${v:1c}"
}
i--
}
return res
}
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// simple_log default log function
fn simple_log(txt string) {
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print(txt)
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}
/******************************************************************************
*
* Token Structs
*
******************************************************************************/
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pub type FnValidator fn (byte) bool
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struct Token{
mut:
ist u32 = u32(0)
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// char
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ch u32 = u32(0) // char of the token if any
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ch_len byte = byte(0) // char len
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// Quantifiers / branch
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rep_min int = 0 // used also for jump next in the OR branch [no match] pc jump
rep_max int = 0 // used also for jump next in the OR branch [ match] pc jump
greedy bool = false // greedy quantifier flag
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// Char class
cc_index int = -1
// counters for quantifier check (repetitions)
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rep int = 0
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// validator function pointer
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validator FnValidator
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// groups variables
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group_rep int = 0 // repetition of the group
group_id int = -1 // id of the group
goto_pc int = -1 // jump to this PC if is needed
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// OR flag for the token
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next_is_or bool = false // true if the next token is an OR
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}
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[inline]
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fn (mut tok Token) reset() {
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tok.rep = 0
}
/******************************************************************************
*
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* Regex struct
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*
******************************************************************************/
pub const (
f_nl = 0x00000001 // end the match when find a new line symbol
f_ms = 0x00000002 // match true only if the match is at the start of the string
f_me = 0x00000004 // match true only if the match is at the end of the string
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f_efm = 0x00000100 // exit on first token matched, used by search
f_bin = 0x00000200 // work only on bytes, ignore utf-8
// behaviour modifier flags
//f_or = 0x00010000 // the OR work with concatenation like PCRE
f_src = 0x00020000 // search mode enabled
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)
struct StateDotObj{
mut:
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i int = -1 // char index in the input buffer
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pc int = -1 // program counter saved
mi int = -1 // match_index saved
group_stack_index int = -1 // continuous save on capturing groups
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}
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pub type FnLog fn (string)
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pub
struct RE {
pub mut:
prog []Token
// char classes storage
cc []CharClass // char class list
cc_index int = 0 // index
// state index
state_stack_index int= -1
state_stack []StateDotObj
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// groups
group_count int = 0 // number of groups in this regex struct
groups []int // groups index results
group_max_nested int = 3 // max nested group
group_max int = 8 // max allowed number of different groups
group_csave []int = []int{} // groups continuous save array
group_csave_index int= -1 // groups continuous save index
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group_map map[string]int // groups names map
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// flags
flag int = 0 // flag for optional parameters
// Debug/log
debug int = 0 // enable in order to have the unroll of the code 0 = NO_DEBUG, 1 = LIGHT 2 = VERBOSE
log_func FnLog = simple_log // log function, can be customized by the user
query string = "" // query string
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}
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// Reset RE object
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//[inline]
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fn (mut re RE) reset(){
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re.cc_index = 0
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mut i := 0
for i < re.prog.len {
re.prog[i].group_rep = 0 // clear repetition of the group
re.prog[i].rep = 0 // clear repetition of the token
i++
}
re.groups = [-1].repeat(re.group_count*2)
re.state_stack_index = -1
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// reset group_csave
if re.group_csave.len > 0 {
re.group_csave_index = 1
re.group_csave[0] = 0 // reset the capture count
}
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}
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// reset for search mode fail
// gcc bug, dont use [inline] or go 5 time slower
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fn (mut re RE) reset_src(){
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mut i := 0
for i < re.prog.len {
re.prog[i].group_rep = 0 // clear repetition of the group
re.prog[i].rep = 0 // clear repetition of the token
i++
}
re.state_stack_index = -1
}
// get_group get a group boundaries by its name
pub fn (re RE) get_group(group_name string) (int, int) {
if group_name in re.group_map {
tmp_index := re.group_map[group_name]-1
start := re.groups[tmp_index*2]
end := re.groups[tmp_index*2+1]
return start,end
}
return -1, -1
}
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/******************************************************************************
*
* Backslashes chars
*
******************************************************************************/
struct BslsStruct {
ch u32 // meta char
validator FnValidator // validator function pointer
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}
const(
bsls_validator_array = [
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BslsStruct{`w`, is_alnum},
BslsStruct{`W`, is_not_alnum},
BslsStruct{`s`, is_space},
BslsStruct{`S`, is_not_space},
BslsStruct{`d`, is_digit},
BslsStruct{`D`, is_not_digit},
BslsStruct{`a`, is_lower},
BslsStruct{`A`, is_upper},
]
// these chars are escape if preceded by a \
bsls_escape_list = [ `\\`,`|`,`.`,`*`,`+`,`-`,`{`,`}`,`[`,`]` ]
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)
enum BSLS_parse_state {
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start
bsls_found
bsls_char
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normal_char
}
// parse_bsls return (index, str_len) bsls_validator_array index, len of the backslash sequence if present
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fn (re RE) parse_bsls(in_txt string, in_i int) (int,int){
mut status := BSLS_parse_state.start
mut i := in_i
for i < in_txt.len {
// get our char
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char_tmp,char_len := re.get_char(in_txt,i)
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ch := byte(char_tmp)
if status == .start && ch == `\\` {
status = .bsls_found
i += char_len
continue
}
// check if is our bsls char, for now only one length sequence
if status == .bsls_found {
for c,x in bsls_validator_array {
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if x.ch == ch {
return c,i-in_i+1
}
}
status = .normal_char
continue
}
// no BSLS validator, manage as normal escape char char
if status == .normal_char {
if ch in bsls_escape_list {
return no_match_found,i-in_i+1
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}
return err_syntax_error,i-in_i+1
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}
// at the present time we manage only one char after the \
break
}
// not our bsls return KO
return err_syntax_error, i
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}
/******************************************************************************
*
* Char class
*
******************************************************************************/
const(
cc_null = 0 // empty cc token
cc_char = 1 // simple char: a
cc_int = 2 // char interval: a-z
cc_bsls = 3 // backslash char
cc_end = 4 // cc sequence terminator
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)
struct CharClass {
mut:
cc_type int = cc_null // type of cc token
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ch0 u32 = u32(0) // first char of the interval a-b a in this case
ch1 u32 = u32(0) // second char of the interval a-b b in this case
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validator FnValidator // validator function pointer
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}
enum CharClass_parse_state {
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start
in_char
in_bsls
separator
finish
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}
fn (re RE) get_char_class(pc int) string {
buf := [byte(0)].repeat(re.cc.len)
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mut buf_ptr := &byte(&buf)
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mut cc_i := re.prog[pc].cc_index
mut i := 0
mut tmp := 0
for cc_i >= 0 && cc_i < re.cc.len && re.cc[cc_i].cc_type != cc_end {
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if re.cc[cc_i].cc_type == cc_bsls {
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buf_ptr[i++] = `\\`
buf_ptr[i++] = byte(re.cc[cc_i].ch0)
}
else if re.cc[cc_i].ch0 == re.cc[cc_i].ch1 {
tmp = 3
for tmp >= 0 {
x := byte((re.cc[cc_i].ch0 >> (tmp*8)) & 0xFF)
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if x != 0 {
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buf_ptr[i++] = x
}
tmp--
}
}
else {
tmp = 3
for tmp >= 0 {
x := byte((re.cc[cc_i].ch0 >> (tmp*8)) & 0xFF)
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if x != 0 {
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buf_ptr[i++] = x
}
tmp--
}
buf_ptr[i++] = `-`
tmp = 3
for tmp >= 0 {
x := byte((re.cc[cc_i].ch1 >> (tmp*8)) & 0xFF)
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if x != 0 {
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buf_ptr[i++] = x
}
tmp--
}
}
cc_i++
}
buf_ptr[i] = byte(0)
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return tos_clone( buf_ptr )
}
fn (re RE) check_char_class(pc int, ch u32) bool {
mut cc_i := re.prog[pc].cc_index
for cc_i >= 0 && cc_i < re.cc.len && re.cc[cc_i].cc_type != cc_end {
if re.cc[cc_i].cc_type == cc_bsls {
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if re.cc[cc_i].validator(byte(ch)) {
return true
}
}
else if ch >= re.cc[cc_i].ch0 && ch <= re.cc[cc_i].ch1 {
return true
}
cc_i++
}
return false
}
// parse_char_class return (index, str_len, cc_type) of a char class [abcm-p], char class start after the [ char
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fn (mut re RE) parse_char_class(in_txt string, in_i int) (int, int, u32) {
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mut status := CharClass_parse_state.start
mut i := in_i
mut tmp_index := re.cc_index
res_index := re.cc_index
mut cc_type := u32(ist_char_class_pos)
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for i < in_txt.len {
// check if we are out of memory for char classes
if tmp_index >= re.cc.len {
return err_cc_alloc_overflow,0,u32(0)
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}
// get our char
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char_tmp,char_len := re.get_char(in_txt,i)
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ch := byte(char_tmp)
//println("CC #${i:3d} ch: ${ch:c}")
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// negation
if status == .start && ch == `^` {
cc_type = u32(ist_char_class_neg)
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i += char_len
continue
}
// minus symbol
if status == .start && ch == `-` {
re.cc[tmp_index].cc_type = cc_char
re.cc[tmp_index].ch0 = char_tmp
re.cc[tmp_index].ch1 = char_tmp
i += char_len
tmp_index++
continue
}
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// bsls
if (status == .start || status == .in_char) && ch == `\\` {
//println("CC bsls.")
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status = .in_bsls
i += char_len
continue
}
if status == .in_bsls {
//println("CC bsls validation.")
for c,x in bsls_validator_array {
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if x.ch == ch {
//println("CC bsls found [${ch:c}]")
re.cc[tmp_index].cc_type = cc_bsls
re.cc[tmp_index].ch0 = bsls_validator_array[c].ch
re.cc[tmp_index].ch1 = bsls_validator_array[c].ch
re.cc[tmp_index].validator = bsls_validator_array[c].validator
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i += char_len
tmp_index++
status = .in_char
break
}
}
if status == .in_bsls {
println("CC bsls not found [${ch:c}]")
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status = .in_char
}else {
continue
}
}
// simple char
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if (status == .start || status == .in_char) &&
ch != `-` && ch != `]`
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{
status = .in_char
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re.cc[tmp_index].cc_type = cc_char
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re.cc[tmp_index].ch0 = char_tmp
re.cc[tmp_index].ch1 = char_tmp
i += char_len
tmp_index++
continue
}
// check range separator
if status == .in_char && ch == `-` {
status = .separator
i += char_len
continue
}
// check range end
if status == .separator && ch != `]` && ch != `-` {
status = .in_char
re.cc[tmp_index-1].cc_type = cc_int
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re.cc[tmp_index-1].ch1 = char_tmp
i += char_len
continue
}
// char class end
if status == .in_char && ch == `]` {
re.cc[tmp_index].cc_type = cc_end
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re.cc[tmp_index].ch0 = 0
re.cc[tmp_index].ch1 = 0
re.cc_index = tmp_index+1
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return res_index, i-in_i+2, cc_type
}
i++
}
return err_syntax_error,0,u32(0)
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}
/******************************************************************************
*
* Re Compiler
*
******************************************************************************/
//
// Quantifier
//
enum Quant_parse_state {
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start
min_parse
comma_checked
max_parse
greedy
gredy_parse
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finish
}
// parse_quantifier return (min, max, str_len, greedy_flag) of a {min,max}? quantifier starting after the { char
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fn (re RE) parse_quantifier(in_txt string, in_i int) (int, int, int, bool) {
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mut status := Quant_parse_state.start
mut i := in_i
mut q_min := 0 // default min in a {} quantifier is 1
mut q_max := 0 // deafult max in a {} quantifier is max_quantifier
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mut ch := byte(0)
for i < in_txt.len {
ch = in_txt.str[i]
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//println("${ch:c} status: $status")
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// exit on no compatible char with {} quantifier
if utf8util_char_len(ch) != 1 {
return err_syntax_error,i,0,false
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}
// min parsing skip if comma present
if status == .start && ch == `,` {
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q_min = 0 // default min in a {} quantifier is 0
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status = .comma_checked
i++
continue
}
if status == .start && is_digit( ch ) {
status = .min_parse
q_min *= 10
q_min += int(ch - `0`)
i++
continue
}
if status == .min_parse && is_digit( ch ) {
q_min *= 10
q_min += int(ch - `0`)
i++
continue
}
// we have parsed the min, now check the max
if status == .min_parse && ch == `,` {
status = .comma_checked
i++
continue
}
// single value {4}
if status == .min_parse && ch == `}` {
q_max = q_min
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status = .greedy
continue
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}
// end without max
if status == .comma_checked && ch == `}` {
q_max = max_quantifier
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status = .greedy
continue
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}
// start max parsing
if status == .comma_checked && is_digit( ch ) {
status = .max_parse
q_max *= 10
q_max += int(ch - `0`)
i++
continue
}
// parse the max
if status == .max_parse && is_digit( ch ) {
q_max *= 10
q_max += int(ch - `0`)
i++
continue
}
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// finished the quantifier
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if status == .max_parse && ch == `}` {
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status = .greedy
continue
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}
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// check if greedy flag char ? is present
if status == .greedy {
if i+1 < in_txt.len {
i++
status = .gredy_parse
continue
}
return q_min, q_max, i-in_i+2, false
}
// check the greedy flag
if status == .gredy_parse {
if ch == `?` {
return q_min, q_max, i-in_i+2, true
} else {
i--
return q_min, q_max, i-in_i+2, false
}
}
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// not a {} quantifier, exit
return err_syntax_error, i, 0, false
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}
// not a conform {} quantifier
return err_syntax_error, i, 0, false
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}
//
// Groups
//
enum Group_parse_state {
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start
q_mark // (?
q_mark1 // (?:|P checking
p_status // (?P
p_start // (?P<
p_end // (?P<...>
p_in_name // (?P<...
finish
}
// parse_groups parse a group for ? (question mark) syntax, if found, return (error, capture_flag, name_of_the_group, next_index)
fn (re RE) parse_groups(in_txt string, in_i int) (int, bool, string, int) {
mut status := Group_parse_state.start
mut i := in_i
mut name := ''
for i < in_txt.len && status != .finish {
// get our char
char_tmp,char_len := re.get_char(in_txt,i)
ch := byte(char_tmp)
// start
if status == .start && ch == `(` {
status = .q_mark
i += char_len
continue
}
// check for question marks
if status == .q_mark && ch == `?` {
status = .q_mark1
i += char_len
continue
}
// non capturing group
if status == .q_mark1 && ch == `:` {
i += char_len
return 0, false, name, i
}
// enter in P section
if status == .q_mark1 && ch == `P` {
status = .p_status
i += char_len
continue
}
// not a valid q mark found
if status == .q_mark1 {
//println("NO VALID Q MARK")
return -2 , true, name, i
}
if status == .p_status && ch == `<` {
status = .p_start
i += char_len
continue
}
if status == .p_start && ch != `>` {
status = .p_in_name
name += "${ch:1c}" // TODO: manage utf8 chars
i += char_len
continue
}
// colect name
if status == .p_in_name && ch != `>` && is_alnum(ch) {
name += "${ch:1c}" // TODO: manage utf8 chars
i += char_len
continue
}
// end name
if status == .p_in_name && ch == `>` {
i += char_len
return 0, true, name, i
}
// error on name group
if status == .p_in_name {
return -2 , true, name, i
}
// normal group, nothig to do, exit
return 0 , true, name, i
}
/* UNREACHABLE */
//println("ERROR!! NOT MEANT TO BE HERE!!1")
return -2 , true, name, i
}
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//
// main compiler
//
// compile return (return code, index) where index is the index of the error in the query string if return code is an error code
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pub fn (mut re RE) compile(in_txt string) (int,int) {
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mut i := 0 // input string index
mut pc := 0 // program counter
mut tmp_code := u32(0)
// group management variables
mut group_count := -1
mut group_stack := [0 ].repeat(re.group_max_nested)
mut group_stack_txt_index := [-1].repeat(re.group_max_nested)
mut group_stack_index := -1
re.query = in_txt // save the query string
i = 0
for i < in_txt.len {
tmp_code = u32(0)
mut char_tmp := u32(0)
mut char_len := 0
//println("i: ${i:3d} ch: ${in_txt.str[i]:c}")
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char_tmp,char_len = re.get_char(in_txt,i)
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//
// check special cases: $ ^
//
if char_len == 1 && i == 0 && byte(char_tmp) == `^` {
re.flag = f_ms
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i = i + char_len
continue
}
if char_len == 1 && i == (in_txt.len-1) && byte(char_tmp) == `$` {
re.flag = f_me
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i = i + char_len
continue
}
// ist_group_start
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if char_len == 1 && pc >= 0 && byte(char_tmp) == `(` {
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//check max groups allowed
if group_count > re.group_max {
return err_groups_overflow,i+1
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}
group_stack_index++
// check max nested groups allowed
if group_stack_index > re.group_max_nested {
return err_groups_max_nested,i+1
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}
tmp_res, cgroup_flag, cgroup_name, next_i := re.parse_groups(in_txt,i)
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// manage question mark format error
if tmp_res < -1 {
return err_group_qm_notation,next_i
}
//println("Parse group: [$tmp_res, $cgroup_flag, ($i,$next_i), '${in_txt[i..next_i]}' ]")
i = next_i
if cgroup_flag == true {
group_count++
}
// calculate the group id
// if it is a named group, recycle the group id
// NOTE: **** the group index is +1 because map return 0 when not found!! ****
mut group_id := group_count
if cgroup_name.len > 0 {
//println("GROUP NAME: ${cgroup_name}")
if cgroup_name in re.group_map{
group_id = re.group_map[cgroup_name]-1
group_count--
} else {
re.group_map[cgroup_name] = group_id+1
}
}
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group_stack_txt_index[group_stack_index] = i
group_stack[group_stack_index] = pc
re.prog[pc].ist = u32(0) | ist_group_start
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re.prog[pc].rep_min = 1
re.prog[pc].rep_max = 1
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// set the group id
if cgroup_flag == false {
//println("NO CAPTURE GROUP")
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re.prog[pc].group_id = -1
} else {
re.prog[pc].group_id = group_id
}
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pc = pc + 1
continue
}
// ist_group_end
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if char_len==1 && pc > 0 && byte(char_tmp) == `)` {
if group_stack_index < 0 {
return err_group_not_balanced,i+1
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}
goto_pc := group_stack[group_stack_index]
group_stack_index--
re.prog[pc].ist = u32(0) | ist_group_end
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re.prog[pc].rep_min = 1
re.prog[pc].rep_max = 1
re.prog[pc].goto_pc = goto_pc // PC where to jump if a group need
re.prog[pc].group_id = re.prog[goto_pc].group_id // id of this group, used for storing data
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re.prog[goto_pc].goto_pc = pc // start goto point to the end group pc
//re.prog[goto_pc].group_id = group_count // id of this group, used for storing data
pc = pc + 1
i = i + char_len
continue
}
// ist_dot_char match any char except the following token
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if char_len==1 && pc >= 0 && byte(char_tmp) == `.` {
re.prog[pc].ist = u32(0) | ist_dot_char
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re.prog[pc].rep_min = 1
re.prog[pc].rep_max = 1
pc = pc + 1
i = i + char_len
continue
}
// OR branch
if char_len==1 && pc > 0 && byte(char_tmp) == `|` {
// two consecutive ist_dot_char are an error
if pc > 0 && re.prog[pc-1].ist == ist_or_branch {
return err_syntax_error,i
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}
re.prog[pc].ist = u32(0) | ist_or_branch
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pc = pc + 1
i = i + char_len
continue
}
// Quantifiers
if char_len==1 && pc > 0{
mut quant_flag := true
match byte(char_tmp) {
`?` {
//println("q: ${char_tmp:c}")
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re.prog[pc-1].rep_min = 0
re.prog[pc-1].rep_max = 1
}
`+` {
//println("q: ${char_tmp:c}")
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re.prog[pc-1].rep_min = 1
re.prog[pc-1].rep_max = max_quantifier
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}
`*` {
//println("q: ${char_tmp:c}")
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re.prog[pc-1].rep_min = 0
re.prog[pc-1].rep_max = max_quantifier
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}
`{` {
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min, max, tmp, greedy := re.parse_quantifier(in_txt, i+1)
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// it is a quantifier
if min >= 0 {
//println("{$min,$max}\n str:[${in_txt[i..i+tmp]}] greedy:$greedy")
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i = i + tmp
re.prog[pc-1].rep_min = min
re.prog[pc-1].rep_max = max
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re.prog[pc-1].greedy = greedy
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continue
}
else {
return min,i
}
// TODO: decide if the open bracket can be conform without the close bracket
/*
// no conform, parse as normal char
else {
quant_flag = false
}
*/
}
else{
quant_flag = false
}
}
if quant_flag {
i = i + char_len
continue
}
}
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// IST_CHAR_CLASS_*
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if char_len==1 && pc >= 0{
if byte(char_tmp) == `[` {
cc_index,tmp,cc_type := re.parse_char_class(in_txt, i+1)
if cc_index >= 0 {
//println("index: $cc_index str:${in_txt[i..i+tmp]}")
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i = i + tmp
re.prog[pc].ist = u32(0) | cc_type
re.prog[pc].cc_index = cc_index
re.prog[pc].rep_min = 1
re.prog[pc].rep_max = 1
pc = pc + 1
continue
}
// cc_class vector memory full
else if cc_index < 0 {
return cc_index, i
}
}
}
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// ist_bsls_char
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if char_len==1 && pc >= 0{
if byte(char_tmp) == `\\` {
bsls_index,tmp := re.parse_bsls(in_txt,i)
//println("index: $bsls_index str:${in_txt[i..i+tmp]}")
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if bsls_index >= 0 {
i = i + tmp
re.prog[pc].ist = u32(0) | ist_bsls_char
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re.prog[pc].rep_min = 1
re.prog[pc].rep_max = 1
re.prog[pc].validator = bsls_validator_array[bsls_index].validator
re.prog[pc].ch = bsls_validator_array[bsls_index].ch
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pc = pc + 1
continue
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}
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// this is an escape char, skip the bsls and continue as a normal char
else if bsls_index == no_match_found {
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i += char_len
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char_tmp,char_len = re.get_char(in_txt,i)
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// continue as simple char
}
// if not an escape or a bsls char then it is an error (at least for now!)
else {
return bsls_index,i+tmp
}
}
}
// ist_simple_char
re.prog[pc].ist = ist_simple_char
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re.prog[pc].ch = char_tmp
re.prog[pc].ch_len = char_len
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re.prog[pc].rep_min = 1
re.prog[pc].rep_max = 1
//println("char: ${char_tmp:c}")
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pc = pc +1
i+=char_len
}
// add end of the program
re.prog[pc].ist = ist_prog_end
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// check for unbalanced groups
if group_stack_index != -1 {
return err_group_not_balanced, group_stack_txt_index[group_stack_index]+1
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}
// check for OR at the end of the program
if pc > 0 && re.prog[pc-1].ist == ist_or_branch {
return err_syntax_error,in_txt.len
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}
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// store the number of groups in the query
re.group_count = group_count+1
//******************************************
// Post processing
//******************************************
// count ist_dot_char to set the size of the state stack
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mut pc1 := 0
mut tmp_count := 0
for pc1 < pc {
if re.prog[pc1].ist == ist_dot_char {
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tmp_count++
}
pc1++
}
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// init the state stack
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re.state_stack = [StateDotObj{}].repeat(tmp_count+1)
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// OR branch
// a|b|cd
// d exit point
// a,b,c branches
// set the jump in the right places
pc1 = 0
for pc1 < pc-2 {
// two consecutive OR are a syntax error
if re.prog[pc1+1].ist == ist_or_branch && re.prog[pc1+2].ist == ist_or_branch {
return err_syntax_error, i
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}
// manange a|b chains like a|(b)|c|d...
// standard solution
if re.prog[pc1].ist != ist_or_branch &&
re.prog[pc1+1].ist == ist_or_branch &&
re.prog[pc1+2].ist != ist_or_branch
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{
re.prog[pc1].next_is_or = true // set that the next token is an OR
re.prog[pc1+1].rep_min = pc1+2 // failed match jump
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// match jump, if an OR chain the next token will be an OR token
mut pc2 := pc1+2
for pc2 < pc-1 {
ist := re.prog[pc2].ist
if ist == ist_group_start {
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re.prog[pc1+1].rep_max = re.prog[pc2].goto_pc + 1
break
}
if ist != ist_or_branch {
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re.prog[pc1+1].rep_max = pc2 + 1
break
}
pc2++
}
//println("Compile OR postproc. [$pc1,OR ${pc1+1},$pc2]")
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pc1 = pc2
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continue
}
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pc1++
}
//******************************************
// DEBUG PRINT REGEX GENERATED CODE
//******************************************
if re.debug > 0 {
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gc := re.get_code()
re.log_func( gc )
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}
//******************************************
return compile_ok, 0
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}
// get_code return the compiled code as regex string, note: may be different from the source!
pub fn (re RE) get_code() string {
mut pc1 := 0
mut res := strings.new_builder(re.cc.len*2*re.prog.len)
res.write("========================================\nv RegEx compiler v $v_regex_version output:\n")
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mut stop_flag := false
for pc1 <= re.prog.len {
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tk := re.prog[pc1]
res.write("PC:${pc1:3d}")
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res.write(" ist: ")
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res.write("${tk.ist:8x}".replace(" ","0") )
res.write(" ")
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ist :=tk.ist
if ist == ist_bsls_char {
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res.write("[\\${tk.ch:1c}] BSLS")
} else if ist == ist_prog_end {
res.write("PROG_END")
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stop_flag = true
} else if ist == ist_or_branch {
res.write("OR ")
} else if ist == ist_char_class_pos {
res.write("[${re.get_char_class(pc1)}] CHAR_CLASS_POS")
} else if ist == ist_char_class_neg {
res.write("[^${re.get_char_class(pc1)}] CHAR_CLASS_NEG")
} else if ist == ist_dot_char {
res.write(". DOT_CHAR")
} else if ist == ist_group_start {
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res.write("( GROUP_START #:${tk.group_id}")
if tk.group_id == -1 {
res.write(" ?:")
} else {
for x in re.group_map.keys() {
if re.group_map[x] == (tk.group_id+1) {
res.write(" ?P<${x}>")
break
}
}
}
} else if ist == ist_group_end {
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res.write(") GROUP_END #:${tk.group_id}")
} else if ist == ist_simple_char {
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res.write("[${tk.ch:1c}] query_ch")
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}
if tk.rep_max == max_quantifier {
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res.write(" {${tk.rep_min:3d},MAX}")
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}else{
if ist == ist_or_branch {
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res.write(" if false go: ${tk.rep_min:3d} if true go: ${tk.rep_max:3d}")
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} else {
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res.write(" {${tk.rep_min:3d},${tk.rep_max:3d}}")
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}
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if tk.greedy == true {
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res.write("?")
}
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}
res.write("\n")
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if stop_flag {
break
}
pc1++
}
res.write("========================================\n")
return res.str()
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}
// get_query return a string with a reconstruction of the query starting from the regex program code
pub fn (re RE) get_query() string {
mut res := strings.new_builder(re.query.len*2)
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if (re.flag & f_ms) != 0 {
res.write("^")
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}
mut i := 0
for i < re.prog.len && re.prog[i].ist != ist_prog_end && re.prog[i].ist != 0{
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tk := &re.prog[i]
ch := tk.ist
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// GROUP start
if ch == ist_group_start {
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if re.debug == 0 {
res.write("(")
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} else {
if tk.group_id == -1 {
res.write("(?:") // non capturing group
} else {
res.write("#${tk.group_id}(")
}
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}
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for x in re.group_map.keys() {
if re.group_map[x] == (tk.group_id+1) {
res.write("?P<${x}>")
break
}
}
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i++
continue
}
// GROUP end
if ch == ist_group_end {
res.write(")")
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}
// OR branch
if ch == ist_or_branch {
res.write("|")
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if re.debug > 0 {
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res.write("{${tk.rep_min},${tk.rep_max}}")
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}
i++
continue
}
// char class
if ch == ist_char_class_neg || ch == ist_char_class_pos {
res.write("[")
if ch == ist_char_class_neg {
res.write("^")
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}
res.write("${re.get_char_class(i)}")
res.write("]")
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}
// bsls char
if ch == ist_bsls_char {
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res.write("\\${tk.ch:1c}")
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}
// ist_dot_char
if ch == ist_dot_char {
res.write(".")
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}
// char alone
if ch == ist_simple_char {
if byte(ch) in bsls_escape_list {
res.write("\\")
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}
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res.write("${tk.ch:c}")
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}
// quantifier
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if !(tk.rep_min == 1 && tk.rep_max == 1) {
if tk.rep_min == 0 && tk.rep_max == 1 {
res.write("?")
} else if tk.rep_min == 1 && tk.rep_max == max_quantifier {
res.write("+")
} else if tk.rep_min == 0 && tk.rep_max == max_quantifier {
res.write("*")
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} else {
if tk.rep_max == max_quantifier {
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res.write("{${tk.rep_min},MAX}")
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} else {
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res.write("{${tk.rep_min},${tk.rep_max}}")
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}
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if tk.greedy == true {
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res.write("?")
}
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}
}
i++
}
if (re.flag & f_me) != 0 {
res.write("$")
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}
return res.str()
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}
/******************************************************************************
*
* Matching
*
******************************************************************************/
enum Match_state{
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start = 0
stop
end
new_line
ist_load // load and execute instruction
ist_next // go to next instruction
ist_next_ks // go to next instruction without clenaning the state
ist_quant_p // match positive ,quantifier check
ist_quant_n // match negative, quantifier check
ist_quant_pg // match positive ,group quantifier check
ist_quant_ng // match negative ,group quantifier check
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}
fn state_str(s Match_state) string {
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match s{
.start { return "start" }
.stop { return "stop" }
.end { return "end" }
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.new_line { return "new line" }
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.ist_load { return "ist_load" }
.ist_next { return "ist_next" }
.ist_next_ks { return "ist_next_ks" }
.ist_quant_p { return "ist_quant_p" }
.ist_quant_n { return "ist_quant_n" }
.ist_quant_pg { return "ist_quant_pg" }
.ist_quant_ng { return "ist_quant_ng" }
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}
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}
struct StateObj {
pub mut:
match_flag bool = false
match_index int = -1
match_first int = -1
}
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pub fn (mut re RE) match_base(in_txt byteptr, in_txt_len int ) (int,int) {
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// result status
mut result := no_match_found // function return
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mut first_match := -1 //index of the first match
mut i := 0 // source string index
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mut ch := u32(0) // examinated char
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mut char_len := 0 // utf8 examinated char len
mut m_state := Match_state.start // start point for the matcher FSM
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mut pc := -1 // program counter
mut state := StateObj{} // actual state
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mut ist := u32(0) // actual instruction
mut l_ist := u32(0) // last matched instruction
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mut group_stack := [-1].repeat(re.group_max)
mut group_data := [-1].repeat(re.group_max)
mut group_index := -1 // group id used to know how many groups are open
mut step_count := 0 // stats for debug
mut dbg_line := 0 // count debug line printed
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re.reset()
if re.debug>0 {
// print header
mut h_buf := strings.new_builder(32)
h_buf.write("flags: ")
h_buf.write("${re.flag:8x}".replace(" ","0"))
h_buf.write("\n")
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sss := h_buf.str()
re.log_func(sss)
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}
for m_state != .end {
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if pc >= 0 && pc < re.prog.len {
ist = re.prog[pc].ist
}else if pc >= re.prog.len {
//println("ERROR!! PC overflow!!")
return err_internal_error, i
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}
//******************************************
// DEBUG LOG
//******************************************
if re.debug>0 {
mut buf2 := strings.new_builder(re.cc.len+128)
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// print all the instructions
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// end of the input text
if i >= in_txt_len {
buf2.write("# ${step_count:3d} END OF INPUT TEXT\n")
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sss := buf2.str()
re.log_func(sss)
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}else{
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// print only the exe instruction
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if (re.debug == 1 && m_state == .ist_load) ||
re.debug == 2
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{
if ist == ist_prog_end {
buf2.write("# ${step_count:3d} PROG_END\n")
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}
else if ist == 0 || m_state in [.start,.ist_next,.stop] {
buf2.write("# ${step_count:3d} s: ${state_str(m_state):12s} PC: NA\n")
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}else{
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ch, char_len = re.get_charb(in_txt,i)
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buf2.write("# ${step_count:3d} s: ${state_str(m_state):12s} PC: ${pc:3d}=>")
buf2.write("${ist:8x}".replace(" ","0"))
buf2.write(" i,ch,len:[${i:3d},'${utf8_str(ch)}',${char_len}] f.m:[${first_match:3d},${state.match_index:3d}] ")
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if ist == ist_simple_char {
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buf2.write("query_ch: [${re.prog[pc].ch:1c}]")
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} else {
if ist == ist_bsls_char {
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buf2.write("BSLS [\\${re.prog[pc].ch:1c}]")
} else if ist == ist_prog_end {
buf2.write("PROG_END")
} else if ist == ist_or_branch {
buf2.write("OR")
} else if ist == ist_char_class_pos {
buf2.write("CHAR_CLASS_POS[${re.get_char_class(pc)}]")
} else if ist == ist_char_class_neg {
buf2.write("CHAR_CLASS_NEG[${re.get_char_class(pc)}]")
} else if ist == ist_dot_char {
buf2.write("DOT_CHAR")
} else if ist == ist_group_start {
tmp_gi :=re.prog[pc].group_id
tmp_gr := re.prog[re.prog[pc].goto_pc].group_rep
buf2.write("GROUP_START #:${tmp_gi} rep:${tmp_gr} ")
} else if ist == ist_group_end {
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buf2.write("GROUP_END #:${re.prog[pc].group_id} deep:${group_index}")
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}
}
if re.prog[pc].rep_max == max_quantifier {
buf2.write("{${re.prog[pc].rep_min},MAX}:${re.prog[pc].rep}")
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} else {
buf2.write("{${re.prog[pc].rep_min},${re.prog[pc].rep_max}}:${re.prog[pc].rep}")
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}
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if re.prog[pc].greedy == true {
buf2.write("?")
}
buf2.write(" (#${group_index})\n")
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}
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sss2 := buf2.str()
re.log_func( sss2 )
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}
}
step_count++
dbg_line++
}
//******************************************
// we're out of text, manage it
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if i >= in_txt_len || m_state == .new_line {
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// manage groups
if group_index >= 0 && state.match_index >= 0 {
//println("End text with open groups!")
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// close the groups
for group_index >= 0 {
tmp_pc := group_data[group_index]
re.prog[tmp_pc].group_rep++
//println("Closing group $group_index {${re.prog[tmp_pc].rep_min},${re.prog[tmp_pc].rep_max}}:${re.prog[tmp_pc].group_rep}")
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if re.prog[tmp_pc].group_rep >= re.prog[tmp_pc].rep_min && re.prog[tmp_pc].group_id >= 0{
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start_i := group_stack[group_index]
group_stack[group_index]=-1
// save group results
g_index := re.prog[tmp_pc].group_id*2
if start_i >= 0 {
re.groups[g_index] = start_i
} else {
re.groups[g_index] = 0
}
re.groups[g_index+1] = i
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// continuous save, save until we have space
if re.group_csave_index > 0 {
// check if we have space to save the record
if (re.group_csave_index + 3) < re.group_csave.len {
// incrment counter
re.group_csave[0]++
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// save the record
re.group_csave[re.group_csave_index++] = g_index >> 1 // group id
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re.group_csave[re.group_csave_index++] = re.groups[g_index] // start
re.group_csave[re.group_csave_index++] = re.groups[g_index+1] // end
}
}
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}
group_index--
}
}
// manage ist_dot_char
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m_state == .end
break
//return no_match_found,0
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}
// starting and init
if m_state == .start {
pc = -1
i = 0
m_state = .ist_next
continue
}
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// ist_next, next instruction reseting its state
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if m_state == .ist_next {
pc = pc + 1
re.prog[pc].reset()
// check if we are in the program bounds
if pc < 0 || pc > re.prog.len {
//println("ERROR!! PC overflow!!")
return err_internal_error, i
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}
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m_state = .ist_load
continue
}
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// ist_next_ks, next instruction keeping its state
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if m_state == .ist_next_ks {
pc = pc + 1
// check if we are in the program bounds
if pc < 0 || pc > re.prog.len {
//println("ERROR!! PC overflow!!")
return err_internal_error, i
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}
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m_state = .ist_load
continue
}
// load the char
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ch, char_len = re.get_charb(in_txt,i)
// check new line if flag f_nl enabled
if (re.flag & f_nl) != 0 && char_len == 1 && byte(ch) in new_line_list {
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m_state = .new_line
continue
}
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// check if stop
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if m_state == .stop {
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// we are in search mode, don't exit until the end
if re.flag & f_src != 0 && ist != ist_prog_end {
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pc = -1
i += char_len
m_state = .ist_next
re.reset_src()
state.match_index = -1
first_match = -1
continue
}
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// if we are in restore state ,do it and restart
//println("re.state_stack_index ${re.state_stack_index}")
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if re.state_stack_index >=0 && re.state_stack[re.state_stack_index].pc >= 0 {
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i = re.state_stack[re.state_stack_index].i
pc = re.state_stack[re.state_stack_index].pc
state.match_index = re.state_stack[re.state_stack_index].mi
group_index = re.state_stack[re.state_stack_index].group_stack_index
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m_state = .ist_load
continue
}
if ist == ist_prog_end {
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return first_match,i
}
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// exit on no match
return result,0
}
// ist_load
if m_state == .ist_load {
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// program end
if ist == ist_prog_end {
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// if we are in match exit well
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if group_index >= 0 && state.match_index >= 0 {
group_index = -1
}
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// we have a DOT MATCH on going
//println("ist_prog_end l_ist: ${l_ist:08x}", l_ist)
if re.state_stack_index>=0 && l_ist == ist_dot_char {
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m_state = .stop
continue
}
re.state_stack_index = -1
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m_state = .stop
continue
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}
// check GROUP start, no quantifier is checkd for this token!!
else if ist == ist_group_start {
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group_index++
group_data[group_index] = re.prog[pc].goto_pc // save where is ist_group_end, we will use it for escape
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group_stack[group_index]=i // index where we start to manage
//println("group_index $group_index rep ${re.prog[re.prog[pc].goto_pc].group_rep}")
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m_state = .ist_next
continue
}
// check GROUP end
else if ist == ist_group_end {
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// we are in matching streak
if state.match_index >= 0 {
// restore txt index stack and save the group data
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//println("g.id: ${re.prog[pc].group_id} group_index: ${group_index}")
if group_index >= 0 && re.prog[pc].group_id >= 0 {
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start_i := group_stack[group_index]
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//group_stack[group_index]=-1
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// save group results
g_index := re.prog[pc].group_id*2
if start_i >= 0 {
re.groups[g_index] = start_i
} else {
re.groups[g_index] = 0
}
re.groups[g_index+1] = i
//println("GROUP ${re.prog[pc].group_id} END [${re.groups[g_index]}, ${re.groups[g_index+1]}]")
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// continuous save, save until we have space
if re.group_csave_index > 0 {
// check if we have space to save the record
if (re.group_csave_index + 3) < re.group_csave.len {
// incrment counter
re.group_csave[0]++
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// save the record
re.group_csave[re.group_csave_index++] = g_index >> 1 // group id
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re.group_csave[re.group_csave_index++] = re.groups[g_index] // start
re.group_csave[re.group_csave_index++] = re.groups[g_index+1] // end
}
}
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}
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re.prog[pc].group_rep++ // increase repetitions
//println("GROUP $group_index END ${re.prog[pc].group_rep}")
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m_state = .ist_quant_pg
continue
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}
m_state = .ist_quant_ng
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continue
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}
// check OR
else if ist == ist_or_branch {
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if state.match_index >= 0 {
pc = re.prog[pc].rep_max
//println("ist_or_branch True pc: $pc")
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}else{
pc = re.prog[pc].rep_min
//println("ist_or_branch False pc: $pc")
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}
re.prog[pc].reset()
m_state == .ist_load
continue
}
// check ist_dot_char
else if ist == ist_dot_char {
//println("ist_dot_char rep: ${re.prog[pc].rep}")
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state.match_flag = true
l_ist = u32(ist_dot_char)
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if first_match < 0 {
first_match = i
}
state.match_index = i
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re.prog[pc].rep++
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//if re.prog[pc].rep >= re.prog[pc].rep_min && re.prog[pc].rep <= re.prog[pc].rep_max {
if re.prog[pc].rep >= 0 && re.prog[pc].rep <= re.prog[pc].rep_max {
//println("DOT CHAR save state : ${re.state_stack_index}")
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// save the state
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// manage first dot char
if re.state_stack_index < 0 {
re.state_stack_index++
}
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re.state_stack[re.state_stack_index].pc = pc
re.state_stack[re.state_stack_index].mi = state.match_index
re.state_stack[re.state_stack_index].group_stack_index = group_index
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} else {
re.state_stack[re.state_stack_index].pc = -1
re.state_stack[re.state_stack_index].mi = -1
re.state_stack[re.state_stack_index].group_stack_index = -1
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}
if re.prog[pc].rep >= 1 && re.state_stack_index >= 0 {
re.state_stack[re.state_stack_index].i = i + char_len
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}
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// manage * and {0,} quantifier
if re.prog[pc].rep_min > 0 {
i += char_len // next char
l_ist = u32(ist_dot_char)
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}
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m_state = .ist_next
continue
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}
// char class IST
else if ist == ist_char_class_pos || ist == ist_char_class_neg {
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state.match_flag = false
mut cc_neg := false
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if ist == ist_char_class_neg {
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cc_neg = true
}
mut cc_res := re.check_char_class(pc,ch)
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if cc_neg {
cc_res = !cc_res
}
if cc_res {
state.match_flag = true
l_ist = u32(ist_char_class_pos)
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if first_match < 0 {
first_match = i
}
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state.match_index = i
re.prog[pc].rep++ // increase repetitions
i += char_len // next char
m_state = .ist_quant_p
continue
}
m_state = .ist_quant_n
continue
}
// check bsls
else if ist == ist_bsls_char {
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state.match_flag = false
tmp_res := re.prog[pc].validator(byte(ch))
//println("BSLS in_ch: ${ch:c} res: $tmp_res")
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if tmp_res {
state.match_flag = true
l_ist = u32(ist_bsls_char)
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if first_match < 0 {
first_match = i
}
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state.match_index = i
re.prog[pc].rep++ // increase repetitions
i += char_len // next char
m_state = .ist_quant_p
continue
}
m_state = .ist_quant_n
continue
}
// simple char IST
else if ist == ist_simple_char {
//println("ist_simple_char")
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state.match_flag = false
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if re.prog[pc].ch == ch
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{
state.match_flag = true
l_ist = ist_simple_char
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if first_match < 0 {
first_match = i
}
//println("state.match_index: ${state.match_index}")
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state.match_index = i
re.prog[pc].rep++ // increase repetitions
i += char_len // next char
m_state = .ist_quant_p
continue
}
m_state = .ist_quant_n
continue
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}
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/* UNREACHABLE */
//println("PANIC2!! state: $m_state")
return err_internal_error, i
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}
/***********************************
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* Quantifier management
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***********************************/
// ist_quant_ng
if m_state == .ist_quant_ng {
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// we are finished here
if group_index < 0 {
//println("Early stop!")
result = no_match_found
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m_state = .stop
continue
}
tmp_pc := group_data[group_index] // PC to the end of the group token
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rep := re.prog[tmp_pc].group_rep // use a temp variable
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re.prog[tmp_pc].group_rep = 0 // clear the repetitions
//println(".ist_quant_ng group_pc_end: $tmp_pc rep: $rep")
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if rep >= re.prog[tmp_pc].rep_min {
//println("ist_quant_ng GROUP CLOSED OK group_index: $group_index")
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i = group_stack[group_index]
pc = tmp_pc
group_index--
m_state = .ist_next
continue
}
else if re.prog[tmp_pc].next_is_or {
//println("ist_quant_ng OR Negative branch")
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i = group_stack[group_index]
pc = re.prog[tmp_pc+1].rep_min -1
group_index--
m_state = .ist_next
continue
}
else if rep>0 && rep < re.prog[tmp_pc].rep_min {
//println("ist_quant_ng UNDER THE MINIMUM g.i: $group_index")
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// check if we are inside a group, if yes exit from the nested groups
if group_index > 0{
group_index--
pc = tmp_pc
m_state = .ist_quant_ng //.ist_next
continue
}
if group_index == 0 {
group_index--
pc = tmp_pc // TEST
m_state = .ist_next
continue
}
result = no_match_found
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m_state = .stop
continue
}
else if rep==0 && rep < re.prog[tmp_pc].rep_min {
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//println("ist_quant_ng c_zero UNDER THE MINIMUM g.i: $group_index")
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if group_index > 0{
group_index--
pc = tmp_pc
m_state = .ist_quant_ng //.ist_next
continue
}
result = no_match_found
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m_state = .stop
continue
}
//println("DO NOT STAY HERE!! {${re.prog[tmp_pc].rep_min},${re.prog[tmp_pc].rep_max}}:$rep")
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/* UNREACHABLE */
return err_internal_error, i
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}
// ist_quant_pg
else if m_state == .ist_quant_pg {
//println(".ist_quant_pg")
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mut tmp_pc := pc
if group_index >= 0 {
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tmp_pc = group_data[group_index]
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}
rep := re.prog[tmp_pc].group_rep
if rep < re.prog[tmp_pc].rep_min {
//println("ist_quant_pg UNDER RANGE")
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pc = re.prog[tmp_pc].goto_pc
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m_state = .ist_next
continue
}
else if rep == re.prog[tmp_pc].rep_max {
//println("ist_quant_pg MAX RANGE")
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re.prog[tmp_pc].group_rep = 0 // clear the repetitions
group_index--
m_state = .ist_next
continue
}
else if rep >= re.prog[tmp_pc].rep_min {
//println("ist_quant_pg IN RANGE group_index:$group_index")
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// check greedy flag, if true exit on minimum
if re.prog[tmp_pc].greedy == true {
re.prog[tmp_pc].group_rep = 0 // clear the repetitions
group_index--
m_state = .ist_next
continue
}
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pc = re.prog[tmp_pc].goto_pc - 1
group_index--
m_state = .ist_next
continue
}
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/* UNREACHABLE */
//println("PANIC3!! state: $m_state")
return err_internal_error, i
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}
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// ist_quant_n
else if m_state == .ist_quant_n {
rep := re.prog[pc].rep
//println("Here!! PC $pc is_next_or: ${re.prog[pc].next_is_or}")
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// zero quantifier * or ?
if rep == 0 && re.prog[pc].rep_min == 0 {
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//println("ist_quant_n c_zero RANGE MIN")
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m_state = .ist_next // go to next ist
continue
}
// match + or *
else if rep >= re.prog[pc].rep_min {
//println("ist_quant_n MATCH RANGE")
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m_state = .ist_next
continue
}
// check the OR if present
if re.prog[pc].next_is_or {
//println("OR present on failing")
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state.match_index = -1
m_state = .ist_next
continue
}
// we are in a group manage no match from here
if group_index >= 0 {
//println("ist_quant_n FAILED insied a GROUP group_index:$group_index")
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m_state = .ist_quant_ng
continue
}
// no other options
//println("ist_quant_n no_match_found")
result = no_match_found
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m_state = .stop
continue
//return no_match_found, 0
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}
// ist_quant_p
else if m_state == .ist_quant_p {
// exit on first match
if (re.flag & f_efm) != 0 {
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return i,i+1
}
rep := re.prog[pc].rep
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// under range
if rep > 0 && rep < re.prog[pc].rep_min {
//println("ist_quant_p UNDER RANGE")
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m_state = .ist_load // continue the loop
continue
}
// range ok, continue loop
else if rep >= re.prog[pc].rep_min && rep < re.prog[pc].rep_max {
//println("ist_quant_p IN RANGE")
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// check greedy flag, if true exit on minimum
if re.prog[pc].greedy == true {
m_state = .ist_next
continue
}
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m_state = .ist_load
continue
}
// max reached
else if rep == re.prog[pc].rep_max {
//println("ist_quant_p MAX RANGE")
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m_state = .ist_next
continue
}
}
/* UNREACHABLE */
//println("PANIC4!! state: $m_state")
return err_internal_error, i
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}
// Check the results
if state.match_index >= 0 {
if group_index < 0 {
//println("OK match,natural end [$first_match,$i]")
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return first_match, i
} else {
//println("Skip last group")
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return first_match,group_stack[group_index--]
}
}
//println("no_match_found, natural end")
return no_match_found, 0
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}
/******************************************************************************
*
* Public functions
*
******************************************************************************/
//
// Inits
//
// regex create a regex object from the query string
pub fn regex(in_query string) (RE,int,int){
mut re := RE{}
re.prog = [Token{}].repeat(in_query.len+1)
re.cc = [CharClass{}].repeat(in_query.len+1)
re.group_max_nested = 8
re_err,err_pos := re.compile(in_query)
return re, re_err, err_pos
}
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// new_regex create a RE of small size, usually sufficient for ordinary use
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pub fn new_regex() RE {
return new_regex_by_size(1)
}
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// new_regex_by_size create a RE of large size, mult specify the scale factor of the memory that will be allocated
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pub fn new_regex_by_size(mult int) RE {
mut re := RE{}
re.prog = [Token{}].repeat(max_code_len*mult) // max program length, default 256 istructions
re.cc = [CharClass{}].repeat(max_code_len*mult) // char class list
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re.group_max_nested = 3*mult // max nested group
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return re
}
//
// Matchers
//
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pub fn (mut re RE) match_string(in_txt string) (int,int) {
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start, end := re.match_base(in_txt.str,in_txt.len)
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if start >= 0 && end > start {
if (re.flag & f_ms) != 0 && start > 0 {
return no_match_found, 0
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}
if (re.flag & f_me) != 0 && end < in_txt.len {
if in_txt[end] in new_line_list {
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return start, end
}
return no_match_found, 0
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}
return start, end
}
return start, end
}
//
// Finders
//
// find try to find the first match in the input string
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pub fn (mut re RE) find(in_txt string) (int,int) {
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old_flag := re.flag
re.flag |= f_src // enable search mode
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start, end := re.match_base(in_txt.str, in_txt.len)
re.flag = old_flag
if start >= 0 && end > start {
return start,end
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}
return no_match_found, 0
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}
// find all the non overlapping occurrences of the match pattern
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pub fn (mut re RE) find_all(in_txt string) []int {
mut i := 0
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mut res := []int{}
mut ls := -1
for i < in_txt.len {
s,e := re.find(in_txt[i..])
if s >= 0 && e > s && i+s > ls {
//println("find match in: ${i+s},${i+e} [${in_txt[i+s..i+e]}] ls:$ls")
res << i+s
res << i+e
ls = i+s
i = i+e
continue
} else {
i++
}
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}
return res
}
// replace return a string where the matches are replaced with the replace string
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pub fn (mut re RE) replace(in_txt string, repl string) string {
pos := re.find_all(in_txt)
if pos.len > 0 {
mut res := ""
mut i := 0
mut s1 := 0
mut e1 := in_txt.len
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for i < pos.len {
e1 = pos[i]
res += in_txt[s1..e1] + repl
s1 = pos[i+1]
i += 2
}
res += in_txt[s1..]
return res
}
return in_txt
}