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parser.cpp
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#include <cstdlib>
#include <iostream>
#include <vector>
#include "parser.hpp"
#include "file.hpp"
#include "inspect.hpp"
#include "to_string.hpp"
#include "constants.hpp"
#include "util.hpp"
#include "prelexer.hpp"
#include "sass_functions.h"
#include <typeinfo>
namespace Sass {
using namespace std;
using namespace Constants;
Parser Parser::from_c_str(const char* str, Context& ctx, ParserState pstate)
{
Parser p(ctx, pstate);
p.source = str;
p.position = p.source;
p.end = str + strlen(str);
Block* root = new (ctx.mem) Block(pstate);
p.block_stack.push_back(root);
root->is_root(true);
return p;
}
Parser Parser::from_c_str(const char* beg, const char* end, Context& ctx, ParserState pstate)
{
Parser p(ctx, pstate);
p.source = beg;
p.position = p.source;
p.end = end;
Block* root = new (ctx.mem) Block(pstate);
p.block_stack.push_back(root);
root->is_root(true);
return p;
}
bool Parser::peek_newline(const char* start)
{
return peek_linefeed(start ? start : position);
}
Parser Parser::from_token(Token t, Context& ctx, ParserState pstate)
{
Parser p(ctx, pstate);
p.source = t.begin;
p.position = p.source;
p.end = t.end;
Block* root = new (ctx.mem) Block(pstate);
p.block_stack.push_back(root);
root->is_root(true);
return p;
}
Block* Parser::parse()
{
Block* root = new (ctx.mem) Block(pstate);
block_stack.push_back(root);
root->is_root(true);
read_bom();
if (ctx.queue.size() == 1) {
Import* pre = new (ctx.mem) Import(pstate);
string load_path(ctx.queue[0].load_path);
do_import(load_path, pre, ctx.c_headers, false);
ctx.head_imports = ctx.queue.size() - 1;
if (!pre->urls().empty()) (*root) << pre;
if (!pre->files().empty()) {
for (size_t i = 0, S = pre->files().size(); i < S; ++i) {
(*root) << new (ctx.mem) Import_Stub(pstate, pre->files()[i]);
}
}
}
lex< optional_spaces >();
Selector_Lookahead lookahead_result;
while (position < end) {
parse_block_comments(root);
if (peek< kwd_import >()) {
Import* imp = parse_import();
if (!imp->urls().empty()) (*root) << imp;
if (!imp->files().empty()) {
for (size_t i = 0, S = imp->files().size(); i < S; ++i) {
(*root) << new (ctx.mem) Import_Stub(pstate, imp->files()[i]);
}
}
if (!lex< one_plus< exactly<';'> > >()) error("top-level @import directive must be terminated by ';'", pstate);
}
else if (peek< kwd_mixin >() || peek< kwd_function >()) {
(*root) << parse_definition();
}
else if (peek< variable >()) {
(*root) << parse_assignment();
if (!lex< one_plus< exactly<';'> > >()) error("top-level variable binding must be terminated by ';'", pstate);
}
/*else if (peek< sequence< optional< exactly<'*'> >, alternatives< identifier_schema, identifier >, optional_spaces, exactly<':'>, optional_spaces, exactly<'{'> > >(position)) {
(*root) << parse_propset();
}*/
else if (peek< kwd_include >() /* || peek< exactly<'+'> >() */) {
Mixin_Call* mixin_call = parse_mixin_call();
(*root) << mixin_call;
if (!mixin_call->block() && !lex< one_plus< exactly<';'> > >()) error("top-level @include directive must be terminated by ';'", pstate);
}
else if (peek< kwd_if_directive >()) {
(*root) << parse_if_directive();
}
else if (peek< kwd_for_directive >()) {
(*root) << parse_for_directive();
}
else if (peek< kwd_each_directive >()) {
(*root) << parse_each_directive();
}
else if (peek< kwd_while_directive >()) {
(*root) << parse_while_directive();
}
else if (peek< kwd_media >()) {
(*root) << parse_media_block();
}
else if (peek< kwd_at_root >()) {
(*root) << parse_at_root_block();
}
else if (peek< kwd_supports >()) {
(*root) << parse_feature_block();
}
else if (peek< kwd_warn >()) {
(*root) << parse_warning();
if (!lex< one_plus< exactly<';'> > >()) error("top-level @warn directive must be terminated by ';'", pstate);
}
else if (peek< kwd_err >()) {
(*root) << parse_error();
if (!lex< one_plus< exactly<';'> > >()) error("top-level @error directive must be terminated by ';'", pstate);
}
else if (peek< kwd_dbg >()) {
(*root) << parse_debug();
if (!lex< one_plus< exactly<';'> > >()) error("top-level @debug directive must be terminated by ';'", pstate);
}
// ignore the @charset directive for now
else if (lex< exactly< charset_kwd > >()) {
lex< quoted_string >();
lex< one_plus< exactly<';'> > >();
}
else if (peek< at_keyword >()) {
At_Rule* at_rule = parse_at_rule();
(*root) << at_rule;
if (!at_rule->block() && !lex< one_plus< exactly<';'> > >()) error("top-level directive must be terminated by ';'", pstate);
}
else if ((lookahead_result = lookahead_for_selector(position)).found) {
(*root) << parse_ruleset(lookahead_result);
}
else if (peek< exactly<';'> >()) {
lex< one_plus< exactly<';'> > >();
}
else {
lex< css_whitespace >();
if (position >= end) break;
error("invalid top-level expression", after_token);
}
lex< optional_spaces >();
}
block_stack.pop_back();
return root;
}
void Parser::add_single_file (Import* imp, string import_path) {
string extension;
string unquoted(unquote(import_path));
if (unquoted.length() > 4) { // 2 quote marks + the 4 chars in .css
// a string constant is guaranteed to end with a quote mark, so make sure to skip it when indexing from the end
extension = unquoted.substr(unquoted.length() - 4, 4);
}
if (extension == ".css") {
String_Constant* loc = new (ctx.mem) String_Constant(pstate, unquote(import_path));
Argument* loc_arg = new (ctx.mem) Argument(pstate, loc);
Arguments* loc_args = new (ctx.mem) Arguments(pstate);
(*loc_args) << loc_arg;
Function_Call* new_url = new (ctx.mem) Function_Call(pstate, "url", loc_args);
imp->urls().push_back(new_url);
}
else {
string current_dir = File::dir_name(path);
string resolved(ctx.add_file(current_dir, unquoted));
if (resolved.empty()) error("file to import not found or unreadable: " + unquoted + "\nCurrent dir: " + current_dir, pstate);
imp->files().push_back(resolved);
}
}
void Parser::import_single_file (Import* imp, string import_path) {
if (!unquote(import_path).substr(0, 7).compare("http://") ||
!unquote(import_path).substr(0, 8).compare("https://") ||
!unquote(import_path).substr(0, 2).compare("//"))
{
imp->urls().push_back(new (ctx.mem) String_Quoted(pstate, import_path));
}
else {
add_single_file(imp, import_path);
}
}
bool Parser::do_import(const string& import_path, Import* imp, vector<Sass_Importer_Entry> importers, bool only_one)
{
bool has_import = false;
string load_path = unquote(import_path);
for (auto importer : importers) {
// int priority = sass_importer_get_priority(importer);
Sass_Importer_Fn fn = sass_importer_get_function(importer);
if (Sass_Import_List includes =
fn(load_path.c_str(), importer, ctx.c_compiler)
) {
Sass_Import_List list = includes;
while (*includes) {
Sass_Import_Entry include = *includes;
const char *file = sass_import_get_path(include);
char* source = sass_import_take_source(include);
size_t line = sass_import_get_error_line(include);
size_t column = sass_import_get_error_column(include);
const char* message = sass_import_get_error_message(include);
if (message) {
if (line == string::npos && column == string::npos) error(message, pstate);
else error(message, ParserState(message, source, Position(line, column)));
} else if (source) {
if (file) {
ctx.add_source(file, load_path, source);
imp->files().push_back(file);
} else {
ctx.add_source(load_path, load_path, source);
imp->files().push_back(load_path);
}
} else if(file) {
import_single_file(imp, file);
}
++includes;
}
// deallocate returned memory
sass_delete_import_list(list);
// set success flag
has_import = true;
// break import chain
if (only_one) return true;
}
}
// return result
return has_import;
}
Import* Parser::parse_import()
{
lex< kwd_import >();
Import* imp = new (ctx.mem) Import(pstate);
bool first = true;
do {
while (lex< block_comment >());
if (lex< quoted_string >()) {
if (!do_import(lexed, imp, ctx.c_importers, true))
{
// push single file import
import_single_file(imp, lexed);
}
}
else if (lex< uri_prefix >()) {
Arguments* args = new (ctx.mem) Arguments(pstate);
Function_Call* result = new (ctx.mem) Function_Call(pstate, "url", args);
if (lex < uri_value >()) { // chunk seems to work too!
String* the_url = parse_interpolated_chunk(lexed);
*args << new (ctx.mem) Argument(the_url->pstate(), the_url);
}
else {
error("malformed URL", pstate);
}
if (!lex< exactly<')'> >()) error("URI is missing ')'", pstate);
imp->urls().push_back(result);
}
else {
if (first) error("@import directive requires a url or quoted path", pstate);
else error("expecting another url or quoted path in @import list", pstate);
}
first = false;
} while (lex_css< exactly<','> >());
return imp;
}
Definition* Parser::parse_definition()
{
Definition::Type which_type = Definition::MIXIN;
if (lex< kwd_mixin >()) which_type = Definition::MIXIN;
else if (lex< kwd_function >()) which_type = Definition::FUNCTION;
string which_str(lexed);
if (!lex< identifier >()) error("invalid name in " + which_str + " definition", pstate);
string name(Util::normalize_underscores(lexed));
if (which_type == Definition::FUNCTION && (name == "and" || name == "or" || name == "not"))
{ error("Invalid function name \"" + name + "\".", pstate); }
ParserState source_position_of_def = pstate;
Parameters* params = parse_parameters();
if (!peek< exactly<'{'> >()) error("body for " + which_str + " " + name + " must begin with a '{'", pstate);
if (which_type == Definition::MIXIN) stack.push_back(mixin_def);
else stack.push_back(function_def);
Block* body = parse_block();
stack.pop_back();
Definition* def = new (ctx.mem) Definition(source_position_of_def, name, params, body, &ctx, which_type);
return def;
}
Parameters* Parser::parse_parameters()
{
string name(lexed);
Position position = after_token;
Parameters* params = new (ctx.mem) Parameters(pstate);
if (lex_css< exactly<'('> >()) {
// if there's anything there at all
if (!peek_css< exactly<')'> >()) {
do (*params) << parse_parameter();
while (lex_css< exactly<','> >());
}
if (!lex_css< exactly<')'> >()) error("expected a variable name (e.g. $x) or ')' for the parameter list for " + name, position);
}
return params;
}
Parameter* Parser::parse_parameter()
{
while (lex< alternatives < spaces, block_comment > >());
lex< variable >();
string name(Util::normalize_underscores(lexed));
ParserState pos = pstate;
Expression* val = 0;
bool is_rest = false;
while (lex< alternatives < spaces, block_comment > >());
if (lex< exactly<':'> >()) { // there's a default value
while (lex< block_comment >());
val = parse_space_list();
val->is_delayed(false);
}
else if (lex< exactly< ellipsis > >()) {
is_rest = true;
}
Parameter* p = new (ctx.mem) Parameter(pos, name, val, is_rest);
return p;
}
Mixin_Call* Parser::parse_mixin_call()
{
lex< kwd_include >() /* || lex< exactly<'+'> >() */;
if (!lex< identifier >()) error("invalid name in @include directive", pstate);
ParserState source_position_of_call = pstate;
string name(Util::normalize_underscores(lexed));
Arguments* args = parse_arguments();
Block* content = 0;
if (peek< exactly<'{'> >()) {
content = parse_block();
}
Mixin_Call* the_call = new (ctx.mem) Mixin_Call(source_position_of_call, name, args, content);
return the_call;
}
Arguments* Parser::parse_arguments(bool has_url)
{
string name(lexed);
Position position = after_token;
Arguments* args = new (ctx.mem) Arguments(pstate);
if (lex_css< exactly<'('> >()) {
// if there's anything there at all
if (!peek_css< exactly<')'> >()) {
do (*args) << parse_argument(has_url);
while (lex_css< exactly<','> >());
}
if (!lex_css< exactly<')'> >()) error("expected a variable name (e.g. $x) or ')' for the parameter list for " + name, position);
}
return args;
}
Argument* Parser::parse_argument(bool has_url)
{
Argument* arg;
// some urls can look like line comments (parse literally - chunk would not work)
if (has_url && lex< sequence < uri_value, lookahead < exactly<')'> > > >(false)) {
String* the_url = parse_interpolated_chunk(lexed);
arg = new (ctx.mem) Argument(the_url->pstate(), the_url);
}
else if (peek_css< sequence < variable, optional_css_comments, exactly<':'> > >()) {
lex_css< variable >();
string name(Util::normalize_underscores(lexed));
ParserState p = pstate;
lex_css< exactly<':'> >();
Expression* val = parse_space_list();
val->is_delayed(false);
arg = new (ctx.mem) Argument(p, val, name);
}
else {
bool is_arglist = false;
bool is_keyword = false;
Expression* val = parse_space_list();
val->is_delayed(false);
if (lex_css< exactly< ellipsis > >()) {
if (val->concrete_type() == Expression::MAP) is_keyword = true;
else is_arglist = true;
}
arg = new (ctx.mem) Argument(pstate, val, "", is_arglist, is_keyword);
}
return arg;
}
Assignment* Parser::parse_assignment()
{
lex< variable >();
string name(Util::normalize_underscores(lexed));
ParserState var_source_position = pstate;
if (!lex< exactly<':'> >()) error("expected ':' after " + name + " in assignment statement", pstate);
Expression* val = parse_list();
val->is_delayed(false);
bool is_default = false;
bool is_global = false;
while (peek< default_flag >() || peek< global_flag >()) {
is_default = lex< default_flag >() || is_default;
is_global = lex< global_flag >() || is_global;
}
Assignment* var = new (ctx.mem) Assignment(var_source_position, name, val, is_default, is_global);
return var;
}
/* not used anymore - remove?
Propset* Parser::parse_propset()
{
String* property_segment;
if (peek< sequence< optional< exactly<'*'> >, identifier_schema > >()) {
property_segment = parse_identifier_schema();
}
else {
lex< sequence< optional< exactly<'*'> >, identifier > >();
property_segment = new (ctx.mem) String_Quoted(pstate, lexed);
}
Propset* propset = new (ctx.mem) Propset(pstate, property_segment);
lex< exactly<':'> >();
if (!peek< exactly<'{'> >()) error("expected a '{' after namespaced property", pstate);
propset->block(parse_block());
propset->tabs(indentation);
return propset;
} */
Ruleset* Parser::parse_ruleset(Selector_Lookahead lookahead)
{
Selector* sel;
if (lookahead.has_interpolants) {
sel = parse_selector_schema(lookahead.found);
}
else {
sel = parse_selector_group();
}
bool old_in_at_root = in_at_root;
lex < css_comments >();
in_at_root = false;
ParserState r_source_position = pstate;
if (!peek< exactly<'{'> >()) error("expected a '{' after the selector", pstate);
Block* block = parse_block();
in_at_root = old_in_at_root;
old_in_at_root = false;
Ruleset* ruleset = new (ctx.mem) Ruleset(r_source_position, sel, block);
return ruleset;
}
Selector_Schema* Parser::parse_selector_schema(const char* end_of_selector)
{
lex< optional_spaces >();
const char* i = position;
String_Schema* schema = new (ctx.mem) String_Schema(pstate);
while (i < end_of_selector) {
// try to parse mutliple interpolants
if (const char* p = find_first_in_interval< exactly<hash_lbrace> >(i, end_of_selector)) {
// accumulate the preceding segment if the position has advanced
if (i < p) (*schema) << new (ctx.mem) String_Quoted(pstate, string(i, p));
// skip to the delimiter by skipping occurences in quoted strings
const char* j = skip_over_scopes< exactly<hash_lbrace>, exactly<rbrace> >(p + 2, end_of_selector);
Expression* interpolant = Parser::from_c_str(p+2, j, ctx, pstate).parse_list();
interpolant->is_interpolant(true);
(*schema) << interpolant;
i = j;
}
// no more interpolants have been found
// add the last segment if there is one
else {
if (i < end_of_selector) (*schema) << new (ctx.mem) String_Quoted(pstate, string(i, end_of_selector));
break;
}
}
position = end_of_selector;
Selector_Schema* selector_schema = new (ctx.mem) Selector_Schema(pstate, schema);
selector_schema->media_block(last_media_block);
selector_schema->last_block(block_stack.back());
return selector_schema;
}
Selector_List* Parser::parse_selector_group()
{
bool reloop = true;
To_String to_string(&ctx);
lex< css_whitespace >();
Selector_List* group = new (ctx.mem) Selector_List(pstate);
group->media_block(last_media_block);
group->last_block(block_stack.back());
do {
reloop = false;
if (peek< alternatives <
exactly<'{'>,
exactly<'}'>,
exactly<')'>,
exactly<';'>
> >())
break; // in case there are superfluous commas at the end
Complex_Selector* comb = parse_selector_combination();
if (!comb->has_reference() && !in_at_root) {
ParserState sel_source_position = pstate;
Selector_Reference* ref = new (ctx.mem) Selector_Reference(sel_source_position);
Compound_Selector* ref_wrap = new (ctx.mem) Compound_Selector(sel_source_position);
ref_wrap->media_block(last_media_block);
ref_wrap->last_block(block_stack.back());
(*ref_wrap) << ref;
if (!comb->head()) {
comb->head(ref_wrap);
comb->has_reference(true);
}
else {
comb = new (ctx.mem) Complex_Selector(sel_source_position, Complex_Selector::ANCESTOR_OF, ref_wrap, comb);
comb->media_block(last_media_block);
comb->last_block(block_stack.back());
comb->has_reference(true);
}
if (peek_newline()) ref_wrap->has_line_break(true);
}
while (peek_css< exactly<','> >())
{
// consume everything up and including the comma speparator
reloop = lex< sequence < optional_css_comments, exactly<','> > >() != 0;
// remember line break (also between some commas)
if (peek_newline()) comb->has_line_feed(true);
if (comb->tail() && peek_newline()) comb->tail()->has_line_feed(true);
if (comb->tail() && comb->tail()->head() && peek_newline()) comb->tail()->head()->has_line_feed(true);
// remember line break (also between some commas)
}
(*group) << comb;
}
while (reloop);
while (lex< optional >()) {
group->is_optional(true);
}
return group;
}
Complex_Selector* Parser::parse_selector_combination()
{
Position sel_source_position(-1);
Compound_Selector* lhs;
if (peek_css< alternatives <
exactly<'+'>,
exactly<'~'>,
exactly<'>'>
> >())
// no selector before the combinator
{ lhs = 0; }
else {
lhs = parse_simple_selector_sequence();
sel_source_position = before_token;
lhs->has_line_break(peek_newline());
}
Complex_Selector::Combinator cmb;
if (lex< exactly<'+'> >()) cmb = Complex_Selector::ADJACENT_TO;
else if (lex< exactly<'~'> >()) cmb = Complex_Selector::PRECEDES;
else if (lex< exactly<'>'> >()) cmb = Complex_Selector::PARENT_OF;
else cmb = Complex_Selector::ANCESTOR_OF;
bool cpx_lf = peek_newline();
Complex_Selector* rhs;
if (peek_css< alternatives <
exactly<','>,
exactly<')'>,
exactly<'{'>,
exactly<'}'>,
exactly<';'>,
optional
> >())
// no selector after the combinator
{ rhs = 0; }
else {
rhs = parse_selector_combination();
sel_source_position = before_token;
}
if (!sel_source_position.line) sel_source_position = before_token;
Complex_Selector* cpx = new (ctx.mem) Complex_Selector(ParserState(path, source, sel_source_position), cmb, lhs, rhs);
cpx->media_block(last_media_block);
cpx->last_block(block_stack.back());
if (cpx_lf) cpx->has_line_break(cpx_lf);
return cpx;
}
Compound_Selector* Parser::parse_simple_selector_sequence()
{
Compound_Selector* seq = new (ctx.mem) Compound_Selector(pstate);
seq->media_block(last_media_block);
seq->last_block(block_stack.back());
bool sawsomething = false;
if (lex< exactly<'&'> >()) {
// check if we have a parent selector on the root level block
if (block_stack.back() && block_stack.back()->is_root()) {
//error("Base-level rules cannot contain the parent-selector-referencing character '&'.", pstate);
}
(*seq) << new (ctx.mem) Selector_Reference(pstate);
sawsomething = true;
// if you see a space after a &, then you're done
if(peek< spaces >() || peek< alternatives < spaces, exactly<';'> > >()) {
return seq;
}
}
if (sawsomething && lex_css< sequence< negate< functional >, alternatives< identifier_alnums, universal, quoted_string, dimension, percentage, number > > >()) {
// saw an ampersand, then allow type selectors with arbitrary number of hyphens at the beginning
(*seq) << new (ctx.mem) Type_Selector(pstate, unquote(lexed));
} else if (lex_css< sequence< negate< functional >, alternatives< type_selector, universal, quoted_string, dimension, percentage, number > > >()) {
// if you see a type selector
(*seq) << new (ctx.mem) Type_Selector(pstate, lexed);
sawsomething = true;
}
if (!sawsomething) {
// don't blindly do this if you saw a & or selector
(*seq) << parse_simple_selector();
}
while (!peek< spaces >(position) &&
!(peek_css < alternatives <
exactly<'+'>,
exactly<'~'>,
exactly<'>'>,
exactly<','>,
exactly<')'>,
exactly<'{'>,
exactly<'}'>,
exactly<';'>
> >(position))) {
(*seq) << parse_simple_selector();
}
return seq;
}
Simple_Selector* Parser::parse_simple_selector()
{
lex < css_comments >();
if (lex< alternatives < id_name, class_name > >()) {
return new (ctx.mem) Selector_Qualifier(pstate, unquote(lexed));
}
else if (lex< quoted_string >()) {
return new (ctx.mem) Type_Selector(pstate, unquote(lexed));
}
else if (lex< alternatives < number, kwd_sel_deep > >()) {
return new (ctx.mem) Type_Selector(pstate, lexed);
}
else if (peek< pseudo_not >()) {
return parse_negated_selector();
}
else if (peek< exactly<':'> >(position) || peek< functional >()) {
return parse_pseudo_selector();
}
else if (peek< exactly<'['> >(position)) {
return parse_attribute_selector();
}
else if (lex< placeholder >()) {
Selector_Placeholder* sel = new (ctx.mem) Selector_Placeholder(pstate, unquote(lexed));
sel->media_block(last_media_block);
sel->last_block(block_stack.back());
return sel;
}
else {
error("invalid selector after " + lexed.to_string(), pstate);
}
// unreachable statement
return 0;
}
Wrapped_Selector* Parser::parse_negated_selector()
{
lex< pseudo_not >();
string name(lexed);
ParserState nsource_position = pstate;
Selector* negated = parse_selector_group();
if (!lex< exactly<')'> >()) {
error("negated selector is missing ')'", pstate);
}
return new (ctx.mem) Wrapped_Selector(nsource_position, name, negated);
}
Simple_Selector* Parser::parse_pseudo_selector() {
if (lex< sequence< pseudo_prefix, functional > >() || lex< functional >()) {
string name(lexed);
String* expr = 0;
ParserState p = pstate;
Selector* wrapped = 0;
if (lex< alternatives< even, odd > >()) {
expr = new (ctx.mem) String_Quoted(p, lexed);
}
else if (peek< binomial >(position)) {
lex< sequence< optional< coefficient >, exactly<'n'> > >();
String_Constant* var_coef = new (ctx.mem) String_Quoted(p, lexed);
lex< sign >();
String_Constant* op = new (ctx.mem) String_Quoted(p, lexed);
// Binary_Expression::Type op = (lexed == "+" ? Binary_Expression::ADD : Binary_Expression::SUB);
lex< one_plus < digit > >();
String_Constant* constant = new (ctx.mem) String_Quoted(p, lexed);
// expr = new (ctx.mem) Binary_Expression(p, op, var_coef, constant);
String_Schema* schema = new (ctx.mem) String_Schema(p, 3);
*schema << var_coef << op << constant;
expr = schema;
}
else if (peek< sequence< optional<sign>,
zero_plus<digit>,
exactly<'n'>,
optional_css_whitespace,
exactly<')'> > >()) {
lex< sequence< optional<sign>,
zero_plus<digit>,
exactly<'n'> > >();
expr = new (ctx.mem) String_Quoted(p, lexed);
}
else if (lex< sequence< optional<sign>, one_plus < digit > > >()) {
expr = new (ctx.mem) String_Quoted(p, lexed);
}
else if (peek< sequence< identifier, optional_css_whitespace, exactly<')'> > >()) {
lex< identifier >();
expr = new (ctx.mem) String_Quoted(p, lexed);
}
else if (lex< quoted_string >()) {
expr = new (ctx.mem) String_Quoted(p, lexed);
}
else if (peek< exactly<')'> >()) {
expr = new (ctx.mem) String_Constant(p, "");
}
else {
wrapped = parse_selector_group();
}
if (!lex< exactly<')'> >()) error("unterminated argument to " + name + "...)", pstate);
if (wrapped) {
return new (ctx.mem) Wrapped_Selector(p, name, wrapped);
}
return new (ctx.mem) Pseudo_Selector(p, name, expr);
}
else if (lex < sequence< pseudo_prefix, identifier > >()) {
return new (ctx.mem) Pseudo_Selector(pstate, unquote(lexed));
}
else {
error("unrecognized pseudo-class or pseudo-element", pstate);
}
// unreachable statement
return 0;
}
Attribute_Selector* Parser::parse_attribute_selector()
{
lex_css< exactly<'['> >();
ParserState p = pstate;
if (!lex_css< attribute_name >()) error("invalid attribute name in attribute selector", pstate);
string name(lexed);
if (lex_css< exactly<']'> >()) return new (ctx.mem) Attribute_Selector(p, name, "", 0);
if (!lex_css< alternatives< exact_match, class_match, dash_match,
prefix_match, suffix_match, substring_match > >()) {
error("invalid operator in attribute selector for " + name, pstate);
}
string matcher(lexed);
String* value = 0;
if (lex_css< identifier >()) {
value = new (ctx.mem) String_Constant(p, lexed);
}
else if (lex_css< quoted_string >()) {
value = parse_interpolated_chunk(lexed, true); // needed!
}
else {
error("expected a string constant or identifier in attribute selector for " + name, pstate);
}
if (!lex_css< exactly<']'> >()) error("unterminated attribute selector for " + name, pstate);
return new (ctx.mem) Attribute_Selector(p, name, matcher, value);
}
/* parse block comment and add to block */
void Parser::parse_block_comments(Block* block)
{
while (lex< block_comment >()) {
bool is_important = lexed.begin[2] == '!';
String* contents = parse_interpolated_chunk(lexed);
(*block) << new (ctx.mem) Comment(pstate, contents, is_important);
}
}
Block* Parser::parse_block()
{
lex< exactly<'{'> >();
bool semicolon = false;
Selector_Lookahead lookahead_result;
Block* block = new (ctx.mem) Block(pstate);
block_stack.push_back(block);
lex< zero_plus < alternatives < space, line_comment > > >();
// JMA - ensure that a block containing only block_comments is parsed
parse_block_comments(block);
while (!lex< exactly<'}'> >()) {
parse_block_comments(block);
if (semicolon) {
if (!lex< one_plus< exactly<';'> > >()) {
error("non-terminal statement or declaration must end with ';'", pstate);
}
semicolon = false;
parse_block_comments(block);
if (lex< sequence< exactly<'}'>, zero_plus< exactly<';'> > > >()) break;
}
else if (peek< kwd_import >(position)) {
if (stack.back() == mixin_def || stack.back() == function_def) {
lex< kwd_import >(); // to adjust the before_token number
error("@import directives are not allowed inside mixins and functions", pstate);
}
Import* imp = parse_import();
if (!imp->urls().empty()) (*block) << imp;
if (!imp->files().empty()) {
for (size_t i = 0, S = imp->files().size(); i < S; ++i) {
(*block) << new (ctx.mem) Import_Stub(pstate, imp->files()[i]);
}
}
semicolon = true;
}
else if (lex< variable >()) {
(*block) << parse_assignment();
semicolon = true;
}
else if (lex< line_comment >()) {
// throw line comments away
}
else if (peek< kwd_if_directive >()) {
(*block) << parse_if_directive();
}
else if (peek< kwd_for_directive >()) {
(*block) << parse_for_directive();
}
else if (peek< kwd_each_directive >()) {
(*block) << parse_each_directive();
}
else if (peek < kwd_while_directive >()) {
(*block) << parse_while_directive();
}
else if (lex < kwd_return_directive >()) {
(*block) << new (ctx.mem) Return(pstate, parse_list());
semicolon = true;
}
else if (peek< kwd_warn >()) {
(*block) << parse_warning();
semicolon = true;
}
else if (peek< kwd_err >()) {
(*block) << parse_error();
semicolon = true;
}
else if (peek< kwd_dbg >()) {
(*block) << parse_debug();
semicolon = true;
}
else if (stack.back() == function_def) {
error("only variable declarations and control directives are allowed inside functions", pstate);
}
else if (peek< kwd_mixin >() || peek< kwd_function >()) {
(*block) << parse_definition();
}
else if (peek< kwd_include >(position)) {
Mixin_Call* the_call = parse_mixin_call();
(*block) << the_call;
// don't need a semicolon after a content block
semicolon = (the_call->block()) ? false : true;
}
else if (lex< kwd_content >()) {
if (stack.back() != mixin_def) {
error("@content may only be used within a mixin", pstate);
}
(*block) << new (ctx.mem) Content(pstate);
semicolon = true;
}
/*
else if (peek< exactly<'+'> >()) {
(*block) << parse_mixin_call();
semicolon = true;
}
*/
else if (lex< kwd_extend >()) {
Selector_Lookahead lookahead = lookahead_for_extension_target(position);
if (!lookahead.found) error("invalid selector for @extend", pstate);
Selector* target;
if (lookahead.has_interpolants) target = parse_selector_schema(lookahead.found);
else target = parse_selector_group();
(*block) << new (ctx.mem) Extension(pstate, target);
semicolon = true;
}
else if (peek< kwd_media >()) {
(*block) << parse_media_block();
}
else if (peek< kwd_supports >()) {
(*block) << parse_feature_block();
}
else if (peek< kwd_at_root >()) {
(*block) << parse_at_root_block();
}
// ignore the @charset directive for now
else if (lex< exactly< charset_kwd > >()) {
lex< quoted_string >();
lex< one_plus< exactly<';'> > >();
}
else if (peek< at_keyword >()) {
At_Rule* at_rule = parse_at_rule();
(*block) << at_rule;
if (!at_rule->block()) semicolon = true;
}
else if ((lookahead_result = lookahead_for_selector(position)).found) {
(*block) << parse_ruleset(lookahead_result);
}/* not used anymore - remove?
else if (peek< sequence< optional< exactly<'*'> >, alternatives< identifier_schema, identifier >, optional_spaces, exactly<':'>, optional_spaces, exactly<'{'> > >(position)) {
(*block) << parse_propset();
}*/
else if (!peek< exactly<';'> >()) {
bool indent = ! peek< sequence< optional< exactly<'*'> >, alternatives< identifier_schema, identifier >, optional_spaces, exactly<':'>, optional_spaces, exactly<'{'> > >(position);
/* not used anymore - remove?
if (peek< sequence< optional< exactly<'*'> >, identifier_schema, exactly<':'>, exactly<'{'> > >()) {
(*block) << parse_propset();
}
else if (peek< sequence< optional< exactly<'*'> >, identifier, exactly<':'>, exactly<'{'> > >()) {
(*block) << parse_propset();
}
else */ {
Declaration* decl = parse_declaration();
decl->tabs(indentation);
(*block) << decl;
if (peek< exactly<'{'> >()) {
// parse a propset that rides on the declaration's property
if (indent) indentation++;
Propset* ps = new (ctx.mem) Propset(pstate, decl->property(), parse_block());
if (indent) indentation--;
(*block) << ps;
}
else {
// finish and let the semicolon get munched
semicolon = true;
}
}
}
else lex< one_plus< exactly<';'> > >();
parse_block_comments(block);
}
block_stack.pop_back();
return block;
}
Declaration* Parser::parse_declaration() {
String* prop = 0;
if (peek< sequence< optional< exactly<'*'> >, identifier_schema > >()) {
prop = parse_identifier_schema();
}
else if (lex< sequence< optional< exactly<'*'> >, identifier > >()) {
prop = new (ctx.mem) String_Quoted(pstate, lexed);
}
else {
error("invalid property name", pstate);
}
if (!lex_css< one_plus< exactly<':'> > >()) error("property \"" + string(lexed) + "\" must be followed by a ':'", pstate);
if (peek_css< exactly<';'> >()) error("style declaration must contain a value", pstate);
if (peek_css< static_value >()) {
return new (ctx.mem) Declaration(prop->pstate(), prop, parse_static_value()/*, lex<important>()*/);
}
else {
Expression* list_ex = parse_list();
if (List* list = dynamic_cast<List*>(list_ex)) {
if (list->length() == 0 && !peek< exactly <'{'> >()) {
css_error("Invalid CSS", " after ", ": expected expression (e.g. 1px, bold), was ");
}
}
return new (ctx.mem) Declaration(prop->pstate(), prop, list_ex/*, lex<important>()*/);
}
}
// parse +/- and return false if negative
bool Parser::parse_number_prefix()
{
bool positive = true;
while(true) {
if (lex < block_comment >()) continue;
if (lex < number_prefix >()) continue;
if (lex < exactly < '-' > >()) {
positive = !positive;