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expr.cc
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expr.cc
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// Copyright 2015 Google Inc. All rights reserved
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build ignore
#include "expr.h"
#include <vector>
#include "eval.h"
#include "func.h"
#include "log.h"
#include "stringprintf.h"
#include "strutil.h"
#include "var.h"
Evaluable::Evaluable() {
}
Evaluable::~Evaluable() {
}
string Evaluable::Eval(Evaluator* ev) const {
string s;
Eval(ev, &s);
return s;
}
Value::Value() {
}
Value::~Value() {
}
string Value::DebugString() const {
if (static_cast<const Value*>(this)) {
return NoLineBreak(DebugString_());
}
return "(null)";
}
class Literal : public Value {
public:
explicit Literal(StringPiece s)
: s_(s) {
}
StringPiece val() const { return s_; }
virtual void Eval(Evaluator*, string* s) const override {
s->append(s_.begin(), s_.end());
}
virtual bool IsLiteral() const override { return true; }
virtual StringPiece GetLiteralValueUnsafe() const override { return s_; }
virtual string DebugString_() const override {
return s_.as_string();
}
private:
StringPiece s_;
};
class Expr : public Value {
public:
Expr() {
}
virtual ~Expr() {
for (Value* v : vals_) {
delete v;
}
}
// Takes the ownership of |v|.
void AddValue(Value* v) {
vals_.push_back(v);
}
virtual void Eval(Evaluator* ev, string* s) const override {
for (Value* v : vals_) {
v->Eval(ev, s);
}
}
virtual string DebugString_() const override {
string r;
for (Value* v : vals_) {
if (r.empty()) {
r += "Expr(";
} else {
r += ", ";
}
r += v->DebugString();
}
if (!r.empty())
r += ")";
return r;
}
virtual Value* Compact() override {
if (vals_.size() != 1) {
return this;
}
Value* r = vals_[0];
vals_.clear();
delete this;
return r;
}
private:
vector<Value*> vals_;
};
class SymRef : public Value {
public:
explicit SymRef(Symbol n)
: name_(n) {
}
virtual ~SymRef() {
}
virtual void Eval(Evaluator* ev, string* s) const override {
Var* v = ev->LookupVar(name_);
v->Eval(ev, s);
}
virtual string DebugString_() const override {
return StringPrintf("SymRef(%s)", name_.c_str());
}
private:
Symbol name_;
};
class VarRef : public Value {
public:
explicit VarRef(Value* n)
: name_(n) {
}
virtual ~VarRef() {
delete name_;
}
virtual void Eval(Evaluator* ev, string* s) const override {
ev->IncrementEvalDepth();
const string&& name = name_->Eval(ev);
ev->DecrementEvalDepth();
Var* v = ev->LookupVar(Intern(name));
v->Eval(ev, s);
}
virtual string DebugString_() const override {
return StringPrintf("VarRef(%s)", name_->DebugString().c_str());
}
private:
Value* name_;
};
class VarSubst : public Value {
public:
explicit VarSubst(Value* n, Value* p, Value* s)
: name_(n), pat_(p), subst_(s) {
}
virtual ~VarSubst() {
delete name_;
delete pat_;
delete subst_;
}
virtual void Eval(Evaluator* ev, string* s) const override {
ev->IncrementEvalDepth();
const string&& name = name_->Eval(ev);
Var* v = ev->LookupVar(Intern(name));
const string&& pat_str = pat_->Eval(ev);
const string&& subst = subst_->Eval(ev);
ev->DecrementEvalDepth();
const string&& value = v->Eval(ev);
WordWriter ww(s);
Pattern pat(pat_str);
for (StringPiece tok : WordScanner(value)) {
ww.MaybeAddWhitespace();
pat.AppendSubstRef(tok, subst, s);
}
}
virtual string DebugString_() const override {
return StringPrintf("VarSubst(%s:%s=%s)",
name_->DebugString().c_str(),
pat_->DebugString().c_str(),
subst_->DebugString().c_str());
}
private:
Value* name_;
Value* pat_;
Value* subst_;
};
class Func : public Value {
public:
explicit Func(FuncInfo* fi)
: fi_(fi) {
}
~Func() {
for (Value* a : args_)
delete a;
}
virtual void Eval(Evaluator* ev, string* s) const override {
LOG("Invoke func %s(%s)", name(), JoinValues(args_, ",").c_str());
ev->IncrementEvalDepth();
fi_->func(args_, ev, s);
ev->DecrementEvalDepth();
}
virtual string DebugString_() const override {
return StringPrintf("Func(%s %s)",
fi_->name,
JoinValues(args_, ",").c_str());
}
void AddArg(Value* v) {
args_.push_back(v);
}
const char* name() const { return fi_->name; }
int arity() const { return fi_->arity; }
int min_arity() const { return fi_->min_arity; }
bool trim_space() const { return fi_->trim_space; }
bool trim_right_space_1st() const { return fi_->trim_right_space_1st; }
private:
FuncInfo* fi_;
vector<Value*> args_;
};
static char CloseParen(char c) {
switch (c) {
case '(':
return ')';
case '{':
return '}';
}
return 0;
}
static size_t SkipSpaces(StringPiece s, const char* terms) {
for (size_t i = 0; i < s.size(); i++) {
char c = s[i];
if (strchr(terms, c))
return i;
if (!isspace(c)) {
if (c != '\\')
return i;
char n = s.get(i + 1);
if (n != '\r' && n != '\n')
return i;
}
}
return s.size();
}
bool ShouldHandleComments(ParseExprOpt opt) {
return opt != ParseExprOpt::DEFINE && opt != ParseExprOpt::COMMAND;
}
void ParseFunc(const Loc& loc,
Func* f, StringPiece s, size_t i, char* terms,
size_t* index_out) {
terms[1] = ',';
terms[2] = '\0';
i += SkipSpaces(s.substr(i), terms);
if (i == s.size()) {
*index_out = i;
return;
}
int nargs = 1;
while (true) {
if (f->arity() && nargs >= f->arity()) {
terms[1] = '\0'; // Drop ','.
}
if (f->trim_space()) {
for (; i < s.size(); i++) {
if (isspace(s[i]))
continue;
if (s[i] == '\\') {
char c = s.get(i+1);
if (c == '\r' || c == '\n')
continue;
}
break;
}
}
const bool trim_right_space = (f->trim_space() ||
(nargs == 1 && f->trim_right_space_1st()));
size_t n;
Value* v = ParseExprImpl(loc, s.substr(i), terms, ParseExprOpt::FUNC,
&n, trim_right_space);
// TODO: concatLine???
f->AddArg(v);
i += n;
if (i == s.size()) {
ERROR("%s:%d: *** unterminated call to function '%s': "
"missing '%c'.",
LOCF(loc), f->name(), terms[0]);
}
nargs++;
if (s[i] == terms[0]) {
i++;
break;
}
i++; // Should be ','.
if (i == s.size())
break;
}
if (nargs <= f->min_arity()) {
ERROR("%s:%d: *** insufficient number of arguments (%d) to function `%s'.",
LOCF(loc), nargs - 1, f->name());
}
*index_out = i;
return;
}
Value* ParseDollar(const Loc& loc, StringPiece s, size_t* index_out) {
CHECK(s.size() >= 2);
CHECK(s[0] == '$');
CHECK(s[1] != '$');
char cp = CloseParen(s[1]);
if (cp == 0) {
*index_out = 2;
return new SymRef(Intern(s.substr(1, 1)));
}
char terms[] = {cp, ':', ' ', 0};
for (size_t i = 2;;) {
size_t n;
Value* vname = ParseExprImpl(loc, s.substr(i), terms,
ParseExprOpt::NORMAL, &n);
i += n;
if (s[i] == cp) {
*index_out = i + 1;
if (vname->IsLiteral()) {
Literal* lit = static_cast<Literal*>(vname);
Symbol sym = Intern(lit->val());
if (g_flags.enable_kati_warnings) {
size_t found = sym.str().find_first_of(" ({");
if (found != string::npos) {
KATI_WARN("%s:%d: *warning*: variable lookup with '%c': %.*s",
loc, sym.str()[found], SPF(s));
}
}
Value* r = new SymRef(sym);
delete lit;
return r;
}
return new VarRef(vname);
}
if (s[i] == ' ' || s[i] == '\\') {
// ${func ...}
if (vname->IsLiteral()) {
Literal* lit = static_cast<Literal*>(vname);
if (FuncInfo* fi = GetFuncInfo(lit->val())) {
delete lit;
Func* func = new Func(fi);
ParseFunc(loc, func, s, i+1, terms, index_out);
return func;
} else {
KATI_WARN("%s:%d: *warning*: unknown make function '%.*s': %.*s",
loc, SPF(lit->val()), SPF(s));
}
}
// Not a function. Drop ' ' from |terms| and parse it
// again. This is inefficient, but this code path should be
// rarely used.
delete vname;
terms[2] = 0;
i = 2;
continue;
}
if (s[i] == ':') {
terms[2] = '\0';
terms[1] = '=';
size_t n;
Value* pat = ParseExprImpl(loc, s.substr(i+1), terms,
ParseExprOpt::NORMAL, &n);
i += 1 + n;
if (s[i] == cp) {
Expr* v = new Expr;
v->AddValue(vname);
v->AddValue(new Literal(":"));
v->AddValue(pat);
*index_out = i + 1;
return new VarRef(v);
}
terms[1] = '\0';
Value* subst = ParseExprImpl(loc, s.substr(i+1), terms,
ParseExprOpt::NORMAL, &n);
i += 1 + n;
*index_out = i + 1;
return new VarSubst(vname->Compact(), pat, subst);
}
// GNU make accepts expressions like $((). See unmatched_paren*.mk
// for detail.
size_t found = s.find(cp);
if (found != string::npos) {
KATI_WARN("%s:%d: *warning*: unmatched parentheses: %.*s",
loc, SPF(s));
*index_out = s.size();
return new SymRef(Intern(s.substr(2, found-2)));
}
ERROR("%s:%d: *** unterminated variable reference.", LOCF(loc));
}
}
Value* ParseExprImpl(const Loc& loc,
StringPiece s, const char* terms, ParseExprOpt opt,
size_t* index_out, bool trim_right_space) {
if (s.get(s.size() - 1) == '\r')
s.remove_suffix(1);
Expr* r = new Expr;
size_t b = 0;
char save_paren = 0;
int paren_depth = 0;
size_t i;
for (i = 0; i < s.size(); i++) {
char c = s[i];
if (terms && strchr(terms, c) && !save_paren) {
break;
}
// Handle a comment.
if (!terms && c == '#' && ShouldHandleComments(opt)) {
if (i > b)
r->AddValue(new Literal(s.substr(b, i-b)));
bool was_backslash = false;
for (; i < s.size() && !(s[i] == '\n' && !was_backslash); i++) {
was_backslash = !was_backslash && s[i] == '\\';
}
*index_out = i;
return r->Compact();
}
if (c == '$') {
if (i + 1 >= s.size()) {
break;
}
if (i > b)
r->AddValue(new Literal(s.substr(b, i-b)));
if (s[i+1] == '$') {
r->AddValue(new Literal(StringPiece("$")));
i += 1;
b = i + 1;
continue;
}
if (terms && strchr(terms, s[i+1])) {
*index_out = i + 1;
return r->Compact();
}
size_t n;
Value* v = ParseDollar(loc, s.substr(i), &n);
i += n;
b = i;
i--;
r->AddValue(v);
continue;
}
if ((c == '(' || c == '{') && opt == ParseExprOpt::FUNC) {
char cp = CloseParen(c);
if (terms && terms[0] == cp) {
paren_depth++;
save_paren = cp;
terms++;
} else if (cp == save_paren) {
paren_depth++;
}
continue;
}
if (c == save_paren) {
paren_depth--;
if (paren_depth == 0) {
terms--;
save_paren = 0;
}
}
if (c == '\\' && i + 1 < s.size() && opt != ParseExprOpt::COMMAND) {
char n = s[i+1];
if (n == '\\') {
i++;
continue;
}
if (n == '#' && ShouldHandleComments(opt)) {
r->AddValue(new Literal(s.substr(b, i-b)));
i++;
b = i;
continue;
}
if (n == '\r' || n == '\n') {
if (terms && strchr(terms, ' ')) {
break;
}
if (i > b) {
r->AddValue(new Literal(TrimRightSpace(s.substr(b, i-b))));
}
r->AddValue(new Literal(StringPiece(" ")));
// Skip the current escaped newline
i += 2;
// Then continue skipping escaped newlines, spaces, and tabs
for (; i < s.size(); i++) {
if (s[i] == '\\' && (s.get(i+1) == '\r' || s.get(i+1) == '\n')) {
i++;
continue;
}
if (s[i] != ' ' && s[i] != '\t') {
break;
}
}
b = i;
i--;
}
}
}
if (i > b) {
StringPiece rest = s.substr(b, i-b);
if (trim_right_space)
rest = TrimRightSpace(rest);
if (!rest.empty())
r->AddValue(new Literal(rest));
}
*index_out = i;
return r->Compact();
}
Value* ParseExpr(const Loc& loc, StringPiece s, ParseExprOpt opt) {
size_t n;
return ParseExprImpl(loc, s, NULL, opt, &n);
}
string JoinValues(const vector<Value*>& vals, const char* sep) {
vector<string> val_strs;
for (Value* v : vals) {
val_strs.push_back(v->DebugString());
}
return JoinStrings(val_strs, sep);
}
Value* NewExpr2(Value* v1, Value* v2) {
Expr* e = new Expr();
e->AddValue(v1);
e->AddValue(v2);
return e;
}
Value* NewExpr3(Value* v1, Value* v2, Value* v3) {
Expr* e = new Expr();
e->AddValue(v1);
e->AddValue(v2);
e->AddValue(v3);
return e;
}
Value* NewLiteral(StringPiece s) {
return new Literal(s);
}