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eval.cpp
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#include "file.hpp"
#include "eval.hpp"
#include "ast.hpp"
#include "bind.hpp"
#include "util.hpp"
#include "to_string.hpp"
#include "inspect.hpp"
#include "to_c.hpp"
#include "context.hpp"
#include "backtrace.hpp"
#include "prelexer.hpp"
#include "parser.hpp"
#include <cstdlib>
#include <cmath>
#include <iostream>
#include <iomanip>
#include <typeinfo>
namespace Sass {
using namespace std;
inline double add(double x, double y) { return x + y; }
inline double sub(double x, double y) { return x - y; }
inline double mul(double x, double y) { return x * y; }
inline double div(double x, double y) { return x / y; } // x/0 checked by caller
typedef double (*bop)(double, double);
bop ops[Binary_Expression::NUM_OPS] = {
0, 0, // and, or
0, 0, 0, 0, 0, 0, // eq, neq, gt, gte, lt, lte
add, sub, mul, div, fmod
};
Eval::Eval(Context& ctx, Contextualize* contextualize, Listize* listize, Env* env, Backtrace* bt)
: ctx(ctx), contextualize(contextualize), listize(listize), env(env), backtrace(bt) { }
Eval::~Eval() { }
Eval* Eval::with(Env* e, Backtrace* bt) // for setting the env before eval'ing an expression
{
contextualize = contextualize->with(0, e, bt);
env = e;
backtrace = bt;
return this;
}
Eval* Eval::with(Selector* c, Env* e, Backtrace* bt, Selector* p, Selector* ex) // for setting the env before eval'ing an expression
{
contextualize = contextualize->with(c, e, bt, p, ex);
env = e;
backtrace = bt;
return this;
}
Expression* Eval::operator()(Block* b)
{
Expression* val = 0;
for (size_t i = 0, L = b->length(); i < L; ++i) {
val = (*b)[i]->perform(this);
if (val) return val;
}
return val;
}
Expression* Eval::operator()(Assignment* a)
{
string var(a->variable());
if (a->is_global()) {
env->set_global(var, a->value()->perform(this));
}
else if (a->is_default()) {
if (env->has_lexical(var)) return 0;
if (env->has_global(var)) {
Expression* e = static_cast<Expression*>(env->get_global(var));
if (e->concrete_type() == Expression::NULL_VAL) {
env->set_global(var, a->value()->perform(this));
}
} else {
env->set_global(var, a->value()->perform(this));
}
}
else {
env->set_lexical(var, a->value()->perform(this));
}
return 0;
}
Expression* Eval::operator()(If* i)
{
if (*i->predicate()->perform(this)) {
return i->consequent()->perform(this);
}
else {
Block* alt = i->alternative();
if (alt) return alt->perform(this);
}
return 0;
}
// For does not create a new env scope
// But iteration vars are reset afterwards
Expression* Eval::operator()(For* f)
{
string variable(f->variable());
Expression* low = f->lower_bound()->perform(this);
if (low->concrete_type() != Expression::NUMBER) {
error("lower bound of `@for` directive must be numeric", low->pstate());
}
Expression* high = f->upper_bound()->perform(this);
if (high->concrete_type() != Expression::NUMBER) {
error("upper bound of `@for` directive must be numeric", high->pstate());
}
Number* sass_start = static_cast<Number*>(low);
Number* sass_end = static_cast<Number*>(high);
// check if units are valid for sequence
if (sass_start->unit() != sass_end->unit()) {
stringstream msg; msg << "Incompatible units: '"
<< sass_start->unit() << "' and '"
<< sass_end->unit() << "'.";
error(msg.str(), low->pstate(), backtrace);
}
double start = sass_start->value();
double end = sass_end->value();
// only create iterator once in this environment
Number* it = new (env->mem) Number(low->pstate(), start, sass_end->unit());
AST_Node* old_var = env->get_local(variable);
env->set_local(variable, it);
Block* body = f->block();
Expression* val = 0;
if (start < end) {
if (f->is_inclusive()) ++end;
for (double i = start;
i < end;
++i) {
it->value(i);
env->set_local(variable, it);
val = body->perform(this);
if (val) break;
}
} else {
if (f->is_inclusive()) --end;
for (double i = start;
i > end;
--i) {
it->value(i);
env->set_local(variable, it);
val = body->perform(this);
if (val) break;
}
}
// restore original environment
if (!old_var) env->del_local(variable);
else env->set_local(variable, old_var);
return val;
}
// Eval does not create a new env scope
// But iteration vars are reset afterwards
Expression* Eval::operator()(Each* e)
{
vector<string> variables(e->variables());
Expression* expr = e->list()->perform(this);
List* list = 0;
Map* map = 0;
if (expr->concrete_type() == Expression::MAP) {
map = static_cast<Map*>(expr);
}
else if (expr->concrete_type() != Expression::LIST) {
list = new (ctx.mem) List(expr->pstate(), 1, List::COMMA);
*list << expr;
}
else {
list = static_cast<List*>(expr);
}
// remember variables and then reset them
vector<AST_Node*> old_vars(variables.size());
for (size_t i = 0, L = variables.size(); i < L; ++i) {
old_vars[i] = env->get_local(variables[i]);
env->set_local(variables[i], 0);
}
Block* body = e->block();
Expression* val = 0;
if (map) {
for (auto key : map->keys()) {
Expression* value = map->at(key);
if (variables.size() == 1) {
List* variable = new (ctx.mem) List(map->pstate(), 2, List::SPACE);
*variable << key;
*variable << value;
env->set_local(variables[0], variable);
} else {
env->set_local(variables[0], key);
env->set_local(variables[1], value);
}
val = body->perform(this);
if (val) break;
}
}
else {
for (size_t i = 0, L = list->length(); i < L; ++i) {
List* variable = 0;
if ((*list)[i]->concrete_type() != Expression::LIST || variables.size() == 1) {
variable = new (ctx.mem) List((*list)[i]->pstate(), 1, List::COMMA);
*variable << (*list)[i];
}
else {
variable = static_cast<List*>((*list)[i]);
}
for (size_t j = 0, K = variables.size(); j < K; ++j) {
if (j < variable->length()) {
env->set_local(variables[j], (*variable)[j]);
}
else {
env->set_local(variables[j], new (ctx.mem) Null(expr->pstate()));
}
val = body->perform(this);
if (val) break;
}
if (val) break;
}
}
// restore original environment
for (size_t j = 0, K = variables.size(); j < K; ++j) {
if(!old_vars[j]) env->del_local(variables[j]);
else env->set_local(variables[j], old_vars[j]);
}
return val;
}
Expression* Eval::operator()(While* w)
{
Expression* pred = w->predicate();
Block* body = w->block();
while (*pred->perform(this)) {
Expression* val = body->perform(this);
if (val) return val;
}
return 0;
}
Expression* Eval::operator()(Return* r)
{
return r->value()->perform(this);
}
Expression* Eval::operator()(Warning* w)
{
Expression* message = w->message()->perform(this);
To_String to_string(&ctx);
// try to use generic function
if (env->has("@warn[f]")) {
Definition* def = static_cast<Definition*>((*env)["@warn[f]"]);
// Block* body = def->block();
// Native_Function func = def->native_function();
Sass_Function_Entry c_cb = def->c_cb();
Sass_Function_Fn c_func = sass_function_get_function(c_cb);
To_C to_c;
union Sass_Value* c_args = sass_make_list(1, SASS_COMMA);
sass_list_set_value(c_args, 0, message->perform(&to_c));
Sass_Value* c_val = c_func(c_args, c_cb, ctx.c_options);
sass_delete_value(c_args);
sass_delete_value(c_val);
return 0;
}
string result(unquote(message->perform(&to_string)));
Backtrace top(backtrace, w->pstate(), "");
cerr << "WARNING: " << result;
cerr << top.to_string(true);
cerr << endl << endl;
return 0;
}
Expression* Eval::operator()(Error* e)
{
Expression* message = e->message()->perform(this);
To_String to_string(&ctx);
// try to use generic function
if (env->has("@error[f]")) {
Definition* def = static_cast<Definition*>((*env)["@error[f]"]);
// Block* body = def->block();
// Native_Function func = def->native_function();
Sass_Function_Entry c_cb = def->c_cb();
Sass_Function_Fn c_func = sass_function_get_function(c_cb);
To_C to_c;
union Sass_Value* c_args = sass_make_list(1, SASS_COMMA);
sass_list_set_value(c_args, 0, message->perform(&to_c));
Sass_Value* c_val = c_func(c_args, c_cb, ctx.c_options);
sass_delete_value(c_args);
sass_delete_value(c_val);
return 0;
}
string result(unquote(message->perform(&to_string)));
error(result, e->pstate());
return 0;
}
Expression* Eval::operator()(Debug* d)
{
Expression* message = d->value()->perform(this);
To_String to_string(&ctx);
// try to use generic function
if (env->has("@debug[f]")) {
Definition* def = static_cast<Definition*>((*env)["@debug[f]"]);
// Block* body = def->block();
// Native_Function func = def->native_function();
Sass_Function_Entry c_cb = def->c_cb();
Sass_Function_Fn c_func = sass_function_get_function(c_cb);
To_C to_c;
union Sass_Value* c_args = sass_make_list(1, SASS_COMMA);
sass_list_set_value(c_args, 0, message->perform(&to_c));
Sass_Value* c_val = c_func(c_args, c_cb, ctx.c_options);
sass_delete_value(c_args);
sass_delete_value(c_val);
return 0;
}
string cwd(ctx.get_cwd());
string result(unquote(message->perform(&to_string)));
string rel_path(Sass::File::resolve_relative_path(d->pstate().path, cwd, cwd));
cerr << rel_path << ":" << d->pstate().line << ":" << " DEBUG: " << result;
cerr << endl;
return 0;
}
Expression* Eval::operator()(List* l)
{
if (l->is_expanded()) return l;
List* ll = new (ctx.mem) List(l->pstate(),
l->length(),
l->separator(),
l->is_arglist());
for (size_t i = 0, L = l->length(); i < L; ++i) {
*ll << (*l)[i]->perform(this);
}
ll->is_expanded(true);
return ll;
}
Expression* Eval::operator()(Map* m)
{
if (m->is_expanded()) return m;
Map* mm = new (ctx.mem) Map(m->pstate(),
m->length());
for (auto key : m->keys()) {
*mm << std::make_pair(key->perform(this), m->at(key)->perform(this));
}
mm->is_expanded(true);
return mm;
}
// -- only need to define two comparisons, and the rest can be implemented in terms of them
bool eq(Expression*, Expression*, Context&, Eval*);
bool lt(Expression*, Expression*, Context&);
// -- arithmetic on the combinations that matter
Expression* op_numbers(Context&, Binary_Expression*, Expression*, Expression*);
Expression* op_number_color(Context&, Binary_Expression::Type, Expression*, Expression*);
Expression* op_color_number(Context&, Binary_Expression::Type, Expression*, Expression*);
Expression* op_colors(Context&, Binary_Expression::Type, Expression*, Expression*);
Expression* op_strings(Context&, Binary_Expression::Type, Expression*, Expression*);
Expression* Eval::operator()(Binary_Expression* b)
{
Binary_Expression::Type op_type = b->type();
// don't eval delayed expressions (the '/' when used as a separator)
if (op_type == Binary_Expression::DIV && b->is_delayed()) return b;
// if one of the operands is a '/' then make sure it's evaluated
Expression* lhs = b->left()->perform(this);
lhs->is_delayed(false);
while (typeid(*lhs) == typeid(Binary_Expression)) lhs = lhs->perform(this);
switch (op_type) {
case Binary_Expression::AND:
return *lhs ? b->right()->perform(this) : lhs;
break;
case Binary_Expression::OR:
return *lhs ? lhs : b->right()->perform(this);
break;
default:
break;
}
// not a logical connective, so go ahead and eval the rhs
Expression* rhs = b->right()->perform(this);
rhs->is_delayed(false);
while (typeid(*rhs) == typeid(Binary_Expression)) rhs = rhs->perform(this);
// see if it's a relational expression
switch(op_type) {
case Binary_Expression::EQ: return new (ctx.mem) Boolean(b->pstate(), eq(lhs, rhs, ctx));
case Binary_Expression::NEQ: return new (ctx.mem) Boolean(b->pstate(), !eq(lhs, rhs, ctx));
case Binary_Expression::GT: return new (ctx.mem) Boolean(b->pstate(), !lt(lhs, rhs, ctx) && !eq(lhs, rhs, ctx));
case Binary_Expression::GTE: return new (ctx.mem) Boolean(b->pstate(), !lt(lhs, rhs, ctx));
case Binary_Expression::LT: return new (ctx.mem) Boolean(b->pstate(), lt(lhs, rhs, ctx));
case Binary_Expression::LTE: return new (ctx.mem) Boolean(b->pstate(), lt(lhs, rhs, ctx) || eq(lhs, rhs, ctx));
default: break;
}
Expression::Concrete_Type l_type = lhs->concrete_type();
Expression::Concrete_Type r_type = rhs->concrete_type();
if (l_type == Expression::NUMBER && r_type == Expression::NUMBER) {
return op_numbers(ctx, b, lhs, rhs);
}
if (l_type == Expression::NUMBER && r_type == Expression::COLOR) {
return op_number_color(ctx, op_type, lhs, rhs);
}
if (l_type == Expression::COLOR && r_type == Expression::NUMBER) {
return op_color_number(ctx, op_type, lhs, rhs);
}
if (l_type == Expression::COLOR && r_type == Expression::COLOR) {
return op_colors(ctx, op_type, lhs, rhs);
}
Expression* ex = op_strings(ctx, op_type, lhs, rhs);
if (String_Constant* str = (String_Constant*) ex)
{
if (str->concrete_type() != Expression::STRING) return ex;
String_Constant* lstr = dynamic_cast<String_Constant*>(lhs);
String_Constant* rstr = dynamic_cast<String_Constant*>(rhs);
if (String_Constant* org = lstr ? lstr : rstr)
{ str->quote_mark(org->quote_mark()); }
}
return ex;
}
Expression* Eval::operator()(Unary_Expression* u)
{
Expression* operand = u->operand()->perform(this);
if (u->type() == Unary_Expression::NOT) {
Boolean* result = new (ctx.mem) Boolean(u->pstate(), (bool)*operand);
result->value(!result->value());
return result;
}
else if (operand->concrete_type() == Expression::NUMBER) {
Number* result = new (ctx.mem) Number(*static_cast<Number*>(operand));
result->value(u->type() == Unary_Expression::MINUS
? -result->value()
: result->value());
return result;
}
else {
To_String to_string(&ctx);
// Special cases: +/- variables which evaluate to null ouput just +/-,
// but +/- null itself outputs the string
if (operand->concrete_type() == Expression::NULL_VAL && typeid(*(u->operand())) == typeid(Variable)) {
u->operand(new (ctx.mem) String_Constant(u->pstate(), ""));
}
else u->operand(operand);
String_Constant* result = new (ctx.mem) String_Constant(u->pstate(),
u->perform(&to_string));
return result;
}
// unreachable
return u;
}
Expression* Eval::operator()(Function_Call* c)
{
string name(Util::normalize_underscores(c->name()));
string full_name(name + "[f]");
Arguments* args = c->arguments();
if (full_name != "if[f]") {
args = static_cast<Arguments*>(args->perform(this));
}
// try to use generic function
if (!env->has(full_name)) {
if (env->has("*[f]")) {
full_name = "*[f]";
}
}
// if it doesn't exist, just pass it through as a literal
if (!env->has(full_name)) {
Function_Call* lit = new (ctx.mem) Function_Call(c->pstate(),
c->name(),
args);
To_String to_string(&ctx);
return new (ctx.mem) String_Constant(c->pstate(),
lit->perform(&to_string));
}
Expression* result = c;
Definition* def = static_cast<Definition*>((*env)[full_name]);
Block* body = def->block();
Native_Function func = def->native_function();
Sass_Function_Entry c_cb = def->c_cb();
if (full_name != "if[f]") {
for (size_t i = 0, L = args->length(); i < L; ++i) {
(*args)[i]->value((*args)[i]->value()->perform(this));
}
}
Parameters* params = def->parameters();
Env new_env;
new_env.link(def->environment());
// bind("function " + c->name(), params, args, ctx, &new_env, this);
// Env* old_env = env;
// env = &new_env;
// Backtrace here(backtrace, c->path(), c->line(), ", in function `" + c->name() + "`");
// backtrace = &here;
// if it's user-defined, eval the body
if (body) {
bind("function " + c->name(), params, args, ctx, &new_env, this);
Env* old_env = env;
env = &new_env;
Backtrace here(backtrace, c->pstate(), ", in function `" + c->name() + "`");
backtrace = &here;
result = body->perform(this);
if (!result) {
error(string("function ") + c->name() + " did not return a value", c->pstate());
}
backtrace = here.parent;
env = old_env;
}
// if it's native, invoke the underlying CPP function
else if (func) {
bind("function " + c->name(), params, args, ctx, &new_env, this);
Env* old_env = env;
env = &new_env;
Backtrace here(backtrace, c->pstate(), ", in function `" + c->name() + "`");
backtrace = &here;
result = func(*env, *old_env, ctx, def->signature(), c->pstate(), backtrace);
backtrace = here.parent;
env = old_env;
}
// else if it's a user-defined c function
else if (c_cb) {
Sass_Function_Fn c_func = sass_function_get_function(c_cb);
if (full_name == "*[f]") {
String_Constant *str = new (ctx.mem) String_Constant(c->pstate(), c->name());
Arguments* new_args = new (ctx.mem) Arguments(c->pstate());
*new_args << new (ctx.mem) Argument(c->pstate(), str);
*new_args += args;
args = new_args;
}
// populates env with default values for params
bind("function " + c->name(), params, args, ctx, &new_env, this);
Env* old_env = env;
env = &new_env;
Backtrace here(backtrace, c->pstate(), ", in function `" + c->name() + "`");
backtrace = &here;
To_C to_c;
union Sass_Value* c_args = sass_make_list(env->local_frame().size(), SASS_COMMA);
for(size_t i = 0; i < params[0].length(); i++) {
string key = params[0][i]->name();
AST_Node* node = env->local_frame().at(key);
Expression* arg = static_cast<Expression*>(node);
sass_list_set_value(c_args, i, arg->perform(&to_c));
}
Sass_Value* c_val = c_func(c_args, c_cb, ctx.c_options);
if (sass_value_get_tag(c_val) == SASS_ERROR) {
error("error in C function " + c->name() + ": " + sass_error_get_message(c_val), c->pstate(), backtrace);
} else if (sass_value_get_tag(c_val) == SASS_WARNING) {
error("warning in C function " + c->name() + ": " + sass_warning_get_message(c_val), c->pstate(), backtrace);
}
result = cval_to_astnode(c_val, ctx, backtrace, c->pstate());
backtrace = here.parent;
sass_delete_value(c_args);
if (c_val != c_args)
sass_delete_value(c_val);
env = old_env;
}
// else it's an overloaded native function; resolve it
else if (def->is_overload_stub()) {
size_t arity = args->length();
stringstream ss;
ss << full_name << arity;
string resolved_name(ss.str());
if (!env->has(resolved_name)) error("overloaded function `" + string(c->name()) + "` given wrong number of arguments", c->pstate());
Definition* resolved_def = static_cast<Definition*>((*env)[resolved_name]);
params = resolved_def->parameters();
Env newer_env;
newer_env.link(resolved_def->environment());
bind("function " + c->name(), params, args, ctx, &newer_env, this);
Env* old_env = env;
env = &newer_env;
Backtrace here(backtrace, c->pstate(), ", in function `" + c->name() + "`");
backtrace = &here;
result = resolved_def->native_function()(*env, *old_env, ctx, resolved_def->signature(), c->pstate(), backtrace);
backtrace = here.parent;
env = old_env;
}
// backtrace = here.parent;
// env = old_env;
// link back to function definition
// only do this for custom functions
if (result->pstate().file == string::npos)
result->pstate(c->pstate());
do {
result->is_delayed(result->concrete_type() == Expression::STRING);
result = result->perform(this);
} while (result->concrete_type() == Expression::NONE);
return result;
}
Expression* Eval::operator()(Function_Call_Schema* s)
{
Expression* evaluated_name = s->name()->perform(this);
Expression* evaluated_args = s->arguments()->perform(this);
String_Schema* ss = new (ctx.mem) String_Schema(s->pstate(), 2);
(*ss) << evaluated_name << evaluated_args;
return ss->perform(this);
}
Expression* Eval::operator()(Variable* v)
{
To_String to_string(&ctx);
string name(v->name());
Expression* value = 0;
if (env->has(name)) value = static_cast<Expression*>((*env)[name]);
else error("Undefined variable: \"" + v->name() + "\".", v->pstate());
// cerr << "name: " << v->name() << "; type: " << typeid(*value).name() << "; value: " << value->perform(&to_string) << endl;
if (typeid(*value) == typeid(Argument)) value = static_cast<Argument*>(value)->value();
// behave according to as ruby sass (add leading zero)
if (value->concrete_type() == Expression::NUMBER) {
value = new (ctx.mem) Number(*static_cast<Number*>(value));
static_cast<Number*>(value)->zero(true);
}
else if (value->concrete_type() == Expression::STRING) {
if (auto str = dynamic_cast<String_Quoted*>(value)) {
value = new (ctx.mem) String_Quoted(*str);
} else if (auto str = dynamic_cast<String_Constant*>(value)) {
value = new (ctx.mem) String_Constant(*str);
}
}
else if (value->concrete_type() == Expression::LIST) {
value = new (ctx.mem) List(*static_cast<List*>(value));
}
else if (value->concrete_type() == Expression::MAP) {
value = new (ctx.mem) Map(*static_cast<Map*>(value));
}
else if (value->concrete_type() == Expression::BOOLEAN) {
value = new (ctx.mem) Boolean(*static_cast<Boolean*>(value));
}
else if (value->concrete_type() == Expression::COLOR) {
value = new (ctx.mem) Color(*static_cast<Color*>(value));
}
else if (value->concrete_type() == Expression::NULL_VAL) {
value = new (ctx.mem) Null(value->pstate());
}
// cerr << "\ttype is now: " << typeid(*value).name() << endl << endl;
return value;
}
Expression* Eval::operator()(Textual* t)
{
using Prelexer::number;
Expression* result = 0;
bool zero = !( t->value().substr(0, 1) == "." ||
t->value().substr(0, 2) == "-." );
const string& text = t->value();
size_t num_pos = text.find_first_not_of(" \n\r\t");
if (num_pos == string::npos) num_pos = text.length();
size_t unit_pos = text.find_first_not_of("-+0123456789.", num_pos);
if (unit_pos == string::npos) unit_pos = text.length();
const string& num = text.substr(num_pos, unit_pos - num_pos);
switch (t->type())
{
case Textual::NUMBER:
result = new (ctx.mem) Number(t->pstate(),
sass_atof(num.c_str()),
"",
zero);
break;
case Textual::PERCENTAGE:
result = new (ctx.mem) Number(t->pstate(),
sass_atof(num.c_str()),
"%",
zero);
break;
case Textual::DIMENSION:
result = new (ctx.mem) Number(t->pstate(),
sass_atof(num.c_str()),
Token(number(text.c_str())),
zero);
break;
case Textual::HEX: {
string hext(t->value().substr(1)); // chop off the '#'
if (hext.length() == 6) {
string r(hext.substr(0,2));
string g(hext.substr(2,2));
string b(hext.substr(4,2));
result = new (ctx.mem) Color(t->pstate(),
static_cast<double>(strtol(r.c_str(), NULL, 16)),
static_cast<double>(strtol(g.c_str(), NULL, 16)),
static_cast<double>(strtol(b.c_str(), NULL, 16)),
1, true,
t->value());
}
else {
result = new (ctx.mem) Color(t->pstate(),
static_cast<double>(strtol(string(2,hext[0]).c_str(), NULL, 16)),
static_cast<double>(strtol(string(2,hext[1]).c_str(), NULL, 16)),
static_cast<double>(strtol(string(2,hext[2]).c_str(), NULL, 16)),
1, false,
t->value());
}
} break;
}
return result;
}
Expression* Eval::operator()(Number* n)
{
// behave according to as ruby sass (add leading zero)
return new (ctx.mem) Number(n->pstate(),
n->value(),
n->unit(),
true);
}
Expression* Eval::operator()(Boolean* b)
{
return b;
}
char is_quoted(string str)
{
size_t len = str.length();
if (len < 2) return 0;
if ((str[0] == '"' && str[len-1] == '"') || (str[0] == '\'' && str[len-1] == '\'')) {
return str[0];
}
else {
return 0;
}
}
string Eval::interpolation(Expression* s) {
if (String_Quoted* str_quoted = dynamic_cast<String_Quoted*>(s)) {
if (str_quoted->quote_mark()) {
return string_escape(str_quoted->value());
} else {
return evacuate_escapes(str_quoted->value());
}
} else if (String_Constant* str_constant = dynamic_cast<String_Constant*>(s)) {
return evacuate_escapes(str_constant->value());
} else if (String_Schema* str_schema = dynamic_cast<String_Schema*>(s)) {
string res = "";
for(auto i : str_schema->elements())
res += (interpolation(i));
//ToDo: do this in one step
auto esc = evacuate_escapes(res);
auto unq = unquote(esc);
if (unq == esc) {
return string_to_output(res);
} else {
return evacuate_quotes(unq);
}
} else if (List* list = dynamic_cast<List*>(s)) {
string acc = ""; // ToDo: different output styles
string sep = list->separator() == List::Separator::COMMA ? "," : " ";
if (ctx.output_style != COMPRESSED && sep == ",") sep += " ";
bool initial = false;
for(auto item : list->elements()) {
if (initial) acc += sep;
acc += interpolation(item);
initial = true;
}
return evacuate_quotes(acc);
} else if (Variable* var = dynamic_cast<Variable*>(s)) {
string name(var->name());
if (!env->has(name)) error("Undefined variable: \"" + var->name() + "\".", var->pstate());
Expression* value = static_cast<Expression*>((*env)[name]);
return evacuate_quotes(interpolation(value));
} else if (Binary_Expression* var = dynamic_cast<Binary_Expression*>(s)) {
Expression* ex = var->perform(this);
return evacuate_quotes(interpolation(ex));
} else if (Function_Call* var = dynamic_cast<Function_Call*>(s)) {
Expression* ex = var->perform(this);
return evacuate_quotes(interpolation(ex));
} else if (Parent_Selector* var = dynamic_cast<Parent_Selector*>(s)) {
Expression* ex = var->perform(this);
return evacuate_quotes(interpolation(ex));
} else if (Selector* var = dynamic_cast<Selector*>(s)) {
Expression* ex = var->perform(this);
return evacuate_quotes(interpolation(ex));
} else {
To_String to_string(&ctx);
// to_string.in_decl_list = true;
return evacuate_quotes(s->perform(&to_string));
}
}
Expression* Eval::operator()(String_Schema* s)
{
string acc;
for (size_t i = 0, L = s->length(); i < L; ++i) {
acc += interpolation((*s)[i]);
}
String_Quoted* str = new (ctx.mem) String_Quoted(s->pstate(), acc);
if (!str->quote_mark()) {
str->value(string_unescape(str->value()));
} else if (str->quote_mark()) {
str->quote_mark('*');
}
return str;
}
Expression* Eval::operator()(String_Constant* s)
{
if (!s->quote_mark() && !s->is_delayed() && ctx.names_to_colors.count(s->value())) {
Color* c = new (ctx.mem) Color(*ctx.names_to_colors[s->value()]);
c->pstate(s->pstate());
c->disp(s->value());
return c;
}
return s;
}
Expression* Eval::operator()(Feature_Query* q)
{
Feature_Query* qq = new (ctx.mem) Feature_Query(q->pstate(),
q->length());
for (size_t i = 0, L = q->length(); i < L; ++i) {
*qq << static_cast<Feature_Query_Condition*>((*q)[i]->perform(this));
}
return qq;
}
Expression* Eval::operator()(Feature_Query_Condition* c)
{
String* feature = c->feature();
Expression* value = c->value();
value = (value ? value->perform(this) : 0);
Feature_Query_Condition* cc = new (ctx.mem) Feature_Query_Condition(c->pstate(),
c->length(),
feature,
value,
c->operand(),
c->is_root());
for (size_t i = 0, L = c->length(); i < L; ++i) {
*cc << static_cast<Feature_Query_Condition*>((*c)[i]->perform(this));
}
return cc;
}
Expression* Eval::operator()(At_Root_Expression* e)
{
Expression* feature = e->feature();
feature = (feature ? feature->perform(this) : 0);
Expression* value = e->value();
value = (value ? value->perform(this) : 0);
Expression* ee = new (ctx.mem) At_Root_Expression(e->pstate(),
static_cast<String*>(feature),
value,
e->is_interpolated());
return ee;
}
Expression* Eval::operator()(Media_Query* q)
{
To_String to_string(&ctx);
String* t = q->media_type();
t = static_cast<String*>(t ? t->perform(this) : 0);
Media_Query* qq = new (ctx.mem) Media_Query(q->pstate(),
t,
q->length(),
q->is_negated(),
q->is_restricted());
for (size_t i = 0, L = q->length(); i < L; ++i) {
*qq << static_cast<Media_Query_Expression*>((*q)[i]->perform(this));
}
return qq;
}
Expression* Eval::operator()(Media_Query_Expression* e)
{
Expression* feature = e->feature();
feature = (feature ? feature->perform(this) : 0);
Expression* value = e->value();
value = (value ? value->perform(this) : 0);
return new (ctx.mem) Media_Query_Expression(e->pstate(),
feature,
value,
e->is_interpolated());
}
Expression* Eval::operator()(Null* n)
{
return n;
}
Expression* Eval::operator()(Argument* a)
{
Expression* val = a->value();
val->is_delayed(false);
val = val->perform(this);
val->is_delayed(false);
bool is_rest_argument = a->is_rest_argument();
bool is_keyword_argument = a->is_keyword_argument();
if (a->is_rest_argument()) {
if (val->concrete_type() == Expression::MAP) {
is_rest_argument = false;
is_keyword_argument = true;
}
else
if(val->concrete_type() != Expression::LIST) {
List* wrapper = new (ctx.mem) List(val->pstate(),
0,
List::COMMA,
true);
*wrapper << val;
val = wrapper;
}
}
return new (ctx.mem) Argument(a->pstate(),
val,
a->name(),
is_rest_argument,
is_keyword_argument);
}
Expression* Eval::operator()(Arguments* a)
{
Arguments* aa = new (ctx.mem) Arguments(a->pstate());
for (size_t i = 0, L = a->length(); i < L; ++i) {
*aa << static_cast<Argument*>((*a)[i]->perform(this));
}
return aa;
}
Expression* Eval::operator()(Comment* c)
{
return 0;
}
Expression* Eval::operator()(Parent_Selector* p)
{
Selector* s = p->perform(contextualize);
// access to parent selector may return 0
Selector_List* l = static_cast<Selector_List*>(s);
if (!s) { l = new (ctx.mem) Selector_List(p->pstate()); }
return l->perform(listize);
}
inline Expression* Eval::fallback_impl(AST_Node* n)
{
return static_cast<Expression*>(n);
}
// All the binary helpers.
bool eq(Expression* lhs, Expression* rhs, Context& ctx)
{
Expression::Concrete_Type ltype = lhs->concrete_type();
Expression::Concrete_Type rtype = rhs->concrete_type();
if (ltype != rtype) return false;
switch (ltype) {
case Expression::BOOLEAN: {
return static_cast<Boolean*>(lhs)->value() ==