#ifndef SASS_PRELEXER_H
#define SASS_PRELEXER_H
#include <cstring>
#include "lexer.hpp"
namespace Sass {
// using namespace Lexer;
namespace Prelexer {
//####################################
// KEYWORD "REGEX" MATCHERS
//####################################
// Match Sass boolean keywords.
const char* kwd_true(const char* src);
const char* kwd_false(const char* src);
const char* kwd_only(const char* src);
const char* kwd_and(const char* src);
const char* kwd_or(const char* src);
const char* kwd_not(const char* src);
const char* kwd_eq(const char* src);
const char* kwd_neq(const char* src);
const char* kwd_gt(const char* src);
const char* kwd_gte(const char* src);
const char* kwd_lt(const char* src);
const char* kwd_lte(const char* src);
// Match standard control chars
const char* kwd_at(const char* src);
const char* kwd_dot(const char* src);
const char* kwd_comma(const char* src);
const char* kwd_colon(const char* src);
const char* kwd_slash(const char* src);
const char* kwd_star(const char* src);
const char* kwd_plus(const char* src);
const char* kwd_minus(const char* src);
//####################################
// SPECIAL "REGEX" CONSTRUCTS
//####################################
// Match a sequence of characters delimited by the supplied chars.
template <char beg, char end, bool esc>
const char* delimited_by(const char* src) {
src = exactly<beg>(src);
if (!src) return 0;
const char* stop;
while (true) {
if (!*src) return 0;
stop = exactly<end>(src);
if (stop && (!esc || *(src - 1) != '\\')) return stop;
src = stop ? stop : src + 1;
}
}
// skip to delimiter (mx) inside given range
// this will savely skip over all quoted strings
// recursive skip stuff delimited by start/stop
// first start/opener must be consumed already!
template<prelexer start, prelexer stop>
const char* skip_over_scopes(const char* src, const char* end) {
size_t level = 0;
bool in_squote = false;
bool in_dquote = false;
// bool in_braces = false;
while (*src) {
// check for abort condition
if (end && src >= end) break;
// has escaped sequence?
if (*src == '\\') {
++ src; // skip this (and next)
}
else if (*src == '"') {
in_dquote = ! in_dquote;
}
else if (*src == '\'') {
in_squote = ! in_squote;
}
else if (in_dquote || in_squote) {
// take everything literally
}
// find another opener inside?
else if (const char* pos = start(src)) {
++ level; // increase counter
src = pos - 1; // advance position
}
// look for the closer (maybe final, maybe not)
else if (const char* final = stop(src)) {
// only close one level?
if (level > 0) -- level;
// return position at end of stop
// delimiter may be multiple chars
else return final;
// advance position
src = final - 1;
}
// next
++ src;
}
return 0;
}
// skip to a skip delimited by parentheses
// uses smart `skip_over_scopes` internally
const char* parenthese_scope(const char* src);
// skip to delimiter (mx) inside given range
// this will savely skip over all quoted strings
// recursive skip stuff delimited by start/stop
// first start/opener must be consumed already!
template<prelexer start, prelexer stop>
const char* skip_over_scopes(const char* src) {
return skip_over_scopes<start, stop>(src, 0);
}
// Match a sequence of characters delimited by the supplied chars.
template <prelexer start, prelexer stop>
const char* recursive_scopes(const char* src) {
// parse opener
src = start(src);
// abort if not found
if (!src) return 0;
// parse the rest until final closer
return skip_over_scopes<start, stop>(src);
}
// Match a sequence of characters delimited by the supplied strings.
template <const char* beg, const char* end, bool esc>
const char* delimited_by(const char* src) {
src = exactly<beg>(src);
if (!src) return 0;
const char* stop;
while (true) {
if (!*src) return 0;
stop = exactly<end>(src);
if (stop && (!esc || *(src - 1) != '\\')) return stop;
src = stop ? stop : src + 1;
}
}
// Tries to match a certain number of times (between the supplied interval).
template<prelexer mx, size_t lo, size_t hi>
const char* between(const char* src) {
for (size_t i = 0; i < lo; ++i) {
src = mx(src);
if (!src) return 0;
}
for (size_t i = lo; i <= hi; ++i) {
const char* new_src = mx(src);
if (!new_src) return src;
src = new_src;
}
return src;
}
// equivalent of STRING_REGULAR_EXPRESSIONS
const char* re_string_double_open(const char* src);
const char* re_string_double_close(const char* src);
const char* re_string_single_open(const char* src);
const char* re_string_single_close(const char* src);
const char* re_string_uri_open(const char* src);
const char* re_string_uri_close(const char* src);
// Match a line comment.
const char* line_comment(const char* src);
// Match a block comment.
const char* block_comment(const char* src);
// Match either.
const char* comment(const char* src);
// Match double- and single-quoted strings.
const char* double_quoted_string(const char* src);
const char* single_quoted_string(const char* src);
const char* quoted_string(const char* src);
// Match interpolants.
const char* interpolant(const char* src);
// Match number prefix ([\+\-]+)
const char* number_prefix(const char* src);
// Match zero plus white-space or line_comments
const char* optional_css_whitespace(const char* src);
const char* css_whitespace(const char* src);
// Match optional_css_whitepace plus block_comments
const char* optional_css_comments(const char* src);
const char* css_comments(const char* src);
// Match one backslash escaped char
const char* escape_seq(const char* src);
// Match CSS css variables.
const char* custom_property_name(const char* src);
// Match a CSS identifier.
const char* identifier(const char* src);
const char* identifier_alpha(const char* src);
const char* identifier_alnum(const char* src);
const char* strict_identifier(const char* src);
const char* strict_identifier_alpha(const char* src);
const char* strict_identifier_alnum(const char* src);
// Match a CSS unit identifier.
const char* one_unit(const char* src);
const char* multiple_units(const char* src);
const char* unit_identifier(const char* src);
// const char* strict_identifier_alnums(const char* src);
// Match reference selector.
const char* re_reference_combinator(const char* src);
const char* static_reference_combinator(const char* src);
const char* schema_reference_combinator(const char* src);
// Match interpolant schemas
const char* identifier_schema(const char* src);
const char* value_schema(const char* src);
const char* sass_value(const char* src);
// const char* filename(const char* src);
// const char* filename_schema(const char* src);
// const char* url_schema(const char* src);
// const char* url_value(const char* src);
const char* vendor_prefix(const char* src);
const char* re_special_directive(const char* src);
const char* re_prefixed_directive(const char* src);
const char* re_almost_any_value_token(const char* src);
// Match CSS '@' keywords.
const char* at_keyword(const char* src);
const char* kwd_import(const char* src);
const char* kwd_at_root(const char* src);
const char* kwd_with_directive(const char* src);
const char* kwd_without_directive(const char* src);
const char* kwd_media(const char* src);
const char* kwd_supports_directive(const char* src);
// const char* keyframes(const char* src);
// const char* keyf(const char* src);
const char* kwd_mixin(const char* src);
const char* kwd_function(const char* src);
const char* kwd_return_directive(const char* src);
const char* kwd_include_directive(const char* src);
const char* kwd_content_directive(const char* src);
const char* kwd_charset_directive(const char* src);
const char* kwd_extend(const char* src);
const char* unicode_seq(const char* src);
const char* kwd_if_directive(const char* src);
const char* kwd_else_directive(const char* src);
const char* elseif_directive(const char* src);
const char* kwd_for_directive(const char* src);
const char* kwd_from(const char* src);
const char* kwd_to(const char* src);
const char* kwd_through(const char* src);
const char* kwd_each_directive(const char* src);
const char* kwd_in(const char* src);
const char* kwd_while_directive(const char* src);
const char* re_nothing(const char* src);
const char* re_type_selector2(const char* src);
const char* re_special_fun(const char* src);
const char* kwd_warn(const char* src);
const char* kwd_err(const char* src);
const char* kwd_dbg(const char* src);
const char* kwd_null(const char* src);
const char* re_selector_list(const char* src);
const char* re_type_selector(const char* src);
const char* re_static_expression(const char* src);
// identifier that can start with hyphens
const char* css_identifier(const char* src);
const char* css_ip_identifier(const char* src);
// Match CSS type selectors
const char* namespace_schema(const char* src);
const char* namespace_prefix(const char* src);
const char* type_selector(const char* src);
const char* hyphens_and_identifier(const char* src);
const char* hyphens_and_name(const char* src);
const char* universal(const char* src);
// Match CSS id names.
const char* id_name(const char* src);
// Match CSS class names.
const char* class_name(const char* src);
// Attribute name in an attribute selector
const char* attribute_name(const char* src);
// Match placeholder selectors.
const char* placeholder(const char* src);
// Match CSS numeric constants.
const char* op(const char* src);
const char* sign(const char* src);
const char* unsigned_number(const char* src);
const char* number(const char* src);
const char* coefficient(const char* src);
const char* binomial(const char* src);
const char* percentage(const char* src);
const char* ampersand(const char* src);
const char* dimension(const char* src);
const char* hex(const char* src);
const char* hexa(const char* src);
const char* hex0(const char* src);
// const char* rgb_prefix(const char* src);
// Match CSS uri specifiers.
const char* uri_prefix(const char* src);
// Match CSS "!important" keyword.
const char* kwd_important(const char* src);
// Match CSS "!optional" keyword.
const char* kwd_optional(const char* src);
// Match Sass "!default" keyword.
const char* default_flag(const char* src);
const char* global_flag(const char* src);
// Match CSS pseudo-class/element prefixes
const char* pseudo_prefix(const char* src);
// Match CSS function call openers.
const char* re_functional(const char* src);
const char* re_pseudo_selector(const char* src);
const char* functional_schema(const char* src);
const char* pseudo_not(const char* src);
// Match CSS 'odd' and 'even' keywords for functional pseudo-classes.
const char* even(const char* src);
const char* odd(const char* src);
// Match CSS attribute-matching operators.
const char* exact_match(const char* src);
const char* class_match(const char* src);
const char* dash_match(const char* src);
const char* prefix_match(const char* src);
const char* suffix_match(const char* src);
const char* substring_match(const char* src);
// Match CSS combinators.
// const char* adjacent_to(const char* src);
// const char* precedes(const char* src);
// const char* parent_of(const char* src);
// const char* ancestor_of(const char* src);
// Match SCSS variable names.
const char* variable(const char* src);
const char* calc_fn_call(const char* src);
// IE stuff
const char* ie_progid(const char* src);
const char* ie_expression(const char* src);
const char* ie_property(const char* src);
const char* ie_keyword_arg(const char* src);
const char* ie_keyword_arg_value(const char* src);
const char* ie_keyword_arg_property(const char* src);
// match url()
const char* H(const char* src);
const char* W(const char* src);
// `UNICODE` makes VS sad
const char* UUNICODE(const char* src);
const char* NONASCII(const char* src);
const char* ESCAPE(const char* src);
const char* real_uri_suffix(const char* src);
// const char* real_uri_prefix(const char* src);
const char* real_uri_value(const char* src);
// Path matching functions.
// const char* folder(const char* src);
// const char* folders(const char* src);
const char* static_string(const char* src);
const char* static_component(const char* src);
const char* static_property(const char* src);
const char* static_value(const char* src);
// Utility functions for finding and counting characters in a string.
template<char c>
const char* find_first(const char* src) {
while (*src && *src != c) ++src;
return *src ? src : 0;
}
template<prelexer mx>
const char* find_first(const char* src) {
while (*src && !mx(src)) ++src;
return *src ? src : 0;
}
template<prelexer mx>
const char* find_first_in_interval(const char* beg, const char* end) {
bool esc = false;
while ((beg < end) && *beg) {
if (esc) esc = false;
else if (*beg == '\\') esc = true;
else if (mx(beg)) return beg;
++beg;
}
return 0;
}
template<prelexer mx, prelexer skip>
const char* find_first_in_interval(const char* beg, const char* end) {
bool esc = false;
while ((beg < end) && *beg) {
if (esc) esc = false;
else if (*beg == '\\') esc = true;
else if (const char* pos = skip(beg)) beg = pos;
else if (mx(beg)) return beg;
++beg;
}
return 0;
}
template <prelexer mx>
unsigned int count_interval(const char* beg, const char* end) {
unsigned int counter = 0;
bool esc = false;
while (beg < end && *beg) {
const char* p;
if (esc) {
esc = false;
++beg;
} else if (*beg == '\\') {
esc = true;
++beg;
} else if ((p = mx(beg))) {
++counter;
beg = p;
}
else {
++beg;
}
}
return counter;
}
template <size_t size, prelexer mx, prelexer pad>
const char* padded_token(const char* src)
{
size_t got = 0;
const char* pos = src;
while (got < size) {
if (!mx(pos)) break;
++ pos; ++ got;
}
while (got < size) {
if (!pad(pos)) break;
++ pos; ++ got;
}
return got ? pos : 0;
}
template <size_t min, size_t max, prelexer mx>
const char* minmax_range(const char* src)
{
size_t got = 0;
const char* pos = src;
while (got < max) {
if (!mx(pos)) break;
++ pos; ++ got;
}
if (got < min) return 0;
if (got > max) return 0;
return pos;
}
template <char min, char max>
const char* char_range(const char* src)
{
if (*src < min) return 0;
if (*src > max) return 0;
return src + 1;
}
}
}
#endif