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Added backslash-b support to regex parser

This commit is contained in:
Andrew S. Rightenburg 2023-08-23 21:59:44 -04:00
parent 2e065e1e09
commit ab89354635
Signed by: rail5
GPG Key ID: A0CB570AB6629159
1 changed files with 34 additions and 1 deletions
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35
shared/parse_regex.cpp
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@ -37,6 +37,9 @@ std::vector<std::string> parse_regex(std::string expression) {
// A flag to set when we hit a caret (^)
bool caret = false;
// A flag to set when we hit backslash-b (\b), signifying "start of line"
bool backslash_b = false;
// A flag to set when we're entering multiple characters into one element of the vector
bool multi_char_entry = false;
@ -57,7 +60,7 @@ std::vector<std::string> parse_regex(std::string expression) {
std::string part(1, c);
int current_index = parsed_expression.size()-1;
if (square_brackets_open || parentheses_level > 0 || escaped || caret) {
if (square_brackets_open || parentheses_level > 0 || escaped || caret || backslash_b) {
multi_char_entry = true;
} else {
multi_char_entry = false;
@ -79,6 +82,7 @@ std::vector<std::string> parse_regex(std::string expression) {
}
caret = false;
backslash_b = false;
break;
case '[':
if (multi_char_entry) {
@ -93,6 +97,7 @@ std::vector<std::string> parse_regex(std::string expression) {
escaped = false;
caret = false;
backslash_b = false;
break;
case ']':
@ -108,6 +113,7 @@ std::vector<std::string> parse_regex(std::string expression) {
escaped = false;
caret = false;
backslash_b = false;
break;
case '(':
@ -123,6 +129,7 @@ std::vector<std::string> parse_regex(std::string expression) {
escaped = false;
caret = false;
backslash_b = false;
break;
case ')':
@ -138,6 +145,7 @@ std::vector<std::string> parse_regex(std::string expression) {
escaped = false;
caret = false;
backslash_b = false;
break;
case '{':
@ -154,6 +162,7 @@ std::vector<std::string> parse_regex(std::string expression) {
escaped = false;
caret = false;
backslash_b = false;
break;
case '}':
@ -176,6 +185,7 @@ std::vector<std::string> parse_regex(std::string expression) {
escaped = false;
caret = false;
backslash_b = false;
break;
case '+':
@ -183,6 +193,7 @@ std::vector<std::string> parse_regex(std::string expression) {
escaped = false;
caret = false;
backslash_b = false;
break;
case '*':
@ -190,6 +201,7 @@ std::vector<std::string> parse_regex(std::string expression) {
escaped = false;
caret = false;
backslash_b = false;
break;
case '?':
@ -197,6 +209,7 @@ std::vector<std::string> parse_regex(std::string expression) {
escaped = false;
caret = false;
backslash_b = false;
break;
case '^':
@ -211,11 +224,30 @@ std::vector<std::string> parse_regex(std::string expression) {
}
escaped = false;
backslash_b = false;
break;
case '$':
parsed_expression[current_index] += part;
escaped = false;
caret = false;
backslash_b = false;
break;
case 'b':
if (escaped) {
backslash_b = true;
} else {
backslash_b = false;
}
if (multi_char_entry) {
parsed_expression[current_index] += part;
} else {
parsed_expression.push_back(part);
}
escaped = false;
caret = false;
break;
@ -273,6 +305,7 @@ std::vector<std::string> parse_regex(std::string expression) {
escaped = false;
caret = false;
backslash_b = false;
}
}