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parser.vala
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parser.vala
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/* Copyright 2009-2015 Yorba Foundation
*
* This software is licensed under the GNU Lesser General Public License
* (version 2.1 or later). See the COPYING file in this distribution.
*/
using Gee;
namespace Valencia {
public class ScanScope : Object {
public int depth;
public int start_pos;
public int end_pos;
public ScanScope(int depth, int start_pos, int end_pos) {
this.depth = depth;
this.start_pos = start_pos;
this.end_pos = end_pos;
}
}
public class ParseInfo : Object {
public Expression inner;
public Expression outer;
public int outer_pos;
public ParseInfo(Expression? inner) {
this.inner = inner;
}
}
public class Parser : Object {
SourceFile source;
Scanner scanner;
Namespace current_namespace;
Token peek_token() { return scanner.peek_token(); }
Token next_token() { return scanner.next_token(); }
bool accept(Token t) { return scanner.accept_token(t); }
// Skip to a right brace or semicolon.
void skip() {
int depth = 0;
while (true)
switch (next_token()) {
case Token.EOF:
return;
case Token.LEFT_BRACE:
++depth;
break;
case Token.RIGHT_BRACE:
if (--depth <= 0) {
accept(Token.SEMICOLON);
return;
}
break;
case Token.SEMICOLON:
if (depth == 0)
return;
break;
}
}
Expression? parse_type() {
accept(Token.UNOWNED) || accept(Token.WEAK);
if (!accept(Token.ID))
return null;
Expression t = new Id(scanner.val());
while (accept(Token.PERIOD)) {
if (!accept(Token.ID))
return null;
t = new CompoundExpression(t, scanner.val());
}
if (accept(Token.LESS_THAN)) { // parameterized type
if (parse_type() == null)
return null;
while (!accept(Token.GREATER_THAN)) {
if (!accept(Token.COMMA) || parse_type() == null)
return null;
}
}
while (true) {
if (accept(Token.QUESTION_MARK) || accept(Token.ASTERISK) || accept(Token.HASH))
continue;
if (accept(Token.LEFT_BRACKET)) {
accept(Token.RIGHT_BRACKET);
continue;
}
break;
}
return t;
}
// Skip an expression, looking for a following comma, right parenthesis,
// semicolon or right brace.
void skip_expression() {
int depth = 0;
while (!scanner.eof()) {
switch (peek_token()) {
case Token.COMMA:
case Token.SEMICOLON:
if (depth == 0)
return;
break;
case Token.LEFT_BRACE:
case Token.LEFT_PAREN:
++depth;
break;
case Token.RIGHT_BRACE:
case Token.RIGHT_PAREN:
if (depth == 0)
return;
--depth;
break;
}
next_token();
}
}
Parameter? parse_parameter() {
if (accept(Token.ELLIPSIS))
return null; // end of parameter list
skip_attributes();
accept(Token.OUT) || accept(Token.REF) || accept(Token.OWNED);
Expression type = parse_type();
if (type == null || !accept(Token.ID))
return null;
Parameter p = new Parameter(type, scanner.val(), source, scanner.start, scanner.end);
if (accept(Token.EQUALS))
skip_expression();
return p;
}
// Parse an expression, returning the expression's type if known.
Expression? parse_expression() {
if (accept(Token.NEW)) {
Expression type = parse_type();
if (accept(Token.LEFT_PAREN)) {
while (true) {
skip_expression();
if (!accept(Token.COMMA))
break;
}
if (accept(Token.RIGHT_PAREN)) {
Token token = peek_token();
if (token == Token.SEMICOLON || token == Token.COMMA)
return type;
}
}
}
// Parse struct/array initializers
if (peek_token() == Token.LEFT_BRACE) {
int depth = 0;
// Look for semicolons to handle incorrect syntax better than skipping to the next scope
while (!scanner.eof() && peek_token() != Token.SEMICOLON) {
if (accept(Token.LEFT_BRACE))
++depth;
else if (accept(Token.RIGHT_BRACE) && --depth == 0)
break;
else next_token();
}
} else skip_expression();
return null;
}
LocalVariable? parse_local_variable(Expression type) {
if (!accept(Token.ID))
return null;
string name = scanner.val();
LocalVariable v = new LocalVariable(type, name, source, scanner.start, scanner.end);
if (accept(Token.EQUALS)) {
Expression inferred_type = parse_expression();
if (v.type.to_string() == "var" && inferred_type != null)
v.type = inferred_type;
}
return v;
}
For? parse_foreach() {
int start = scanner.start;
if (!accept(Token.LEFT_PAREN))
return null;
Expression type = parse_type();
if (type == null) {
skip();
return null;
}
int declaration_start = scanner.start;
ArrayList<LocalVariable> variables = new ArrayList<LocalVariable>();
LocalVariable v = parse_local_variable(type);
if (v == null)
return null;
while (v != null) {
variables.add(v);
if (!accept(Token.COMMA))
break;
v = parse_local_variable(type);
}
DeclarationStatement declaration = new DeclarationStatement(variables, declaration_start,
scanner.end);
// Both for and foreach need to skip to the right parenthesis after declaring variables
do {
skip_expression();
} while (!scanner.eof() && accept(Token.SEMICOLON));
if (!accept(Token.RIGHT_PAREN)) {
skip();
return null;
}
Statement s = parse_statement();
return new For(declaration, s, start, scanner.end);
}
Statement? parse_statement() {
if (accept(Token.FOREACH) || accept(Token.FOR))
return parse_foreach();
Expression type = parse_type();
if (type != null && peek_token() == Token.ID) {
int start = scanner.start;
ArrayList<LocalVariable> variables = new ArrayList<LocalVariable>();
LocalVariable? v = parse_local_variable(type);
while (v != null) {
variables.add(v);
if (!accept(Token.COMMA))
break;
v = parse_local_variable(type);
}
if (accept(Token.SEMICOLON))
return new DeclarationStatement(variables, start, scanner.end);
}
// We found no declaration. Scan through the remainder of the
// statement, looking for an embedded block.
while (true) {
Token t = peek_token();
if (t == Token.EOF || t == Token.RIGHT_BRACE)
// If we see a right brace, then this statement is unterminated:
// it has no semicolon. This might happen if the user is still typing
// the statement. We don't want to consume the brace character.
return null;
switch (next_token()) {
case Token.SEMICOLON:
return null;
case Token.LEFT_BRACE:
return parse_block();
}
}
}
// Parse a block after the opening brace.
Block? parse_block() {
Block b = new Block();
b.start = scanner.start;
while (!scanner.eof() && !accept(Token.RIGHT_BRACE)) {
Statement s = parse_statement();
if (s != null)
b.statements.add(s);
}
b.end = scanner.end;
return b;
}
// Parse a method. Return the method object, or null on error.
Method? parse_method(Method m, string input) {
m.start = scanner.start;
if (!accept(Token.LEFT_PAREN)) {
skip();
return null;
}
while (true) {
Parameter p = parse_parameter();
if (p == null)
break;
m.parameters.add(p);
if (!accept(Token.COMMA))
break;
}
if (!accept(Token.RIGHT_PAREN)) {
skip();
return null;
}
// Look for a semicolon or left brace. (There may be a throws clause in between.)
Token t = Token.NONE;
do {
t = next_token();
if (t == Token.EOF)
return null;
} while (t != Token.LEFT_BRACE && t != Token.SEMICOLON);
// Take the string from the return type all the way to the last ')'
long n = (long) ((char *) scanner.get_start() - (char *) input);
m.update_prototype(input.substring(0, n));
if (t == Token.LEFT_BRACE)
m.body = parse_block();
m.end = scanner.end;
return m;
}
Symbol? parse_method_or_field(Class? enclosing_class) {
bool parse_signal = false, parse_delegate = false;
weak string input = scanner.get_start_after_comments();
if (accept(Token.SIGNAL))
parse_signal = true;
else if (accept(Token.DELEGATE))
parse_delegate = true;
Expression type = parse_type();
if (type == null) {
skip();
return null;
}
if (enclosing_class != null) {
if (peek_token() == Token.LEFT_PAREN && type.to_string() == enclosing_class.name)
return parse_method(new Constructor(null, enclosing_class, source), input);
// Parse named constructors
else if (type is CompoundExpression) {
CompoundExpression qualified_type = type as CompoundExpression;
if (qualified_type.left.to_string() == enclosing_class.name)
return parse_method(new Constructor(qualified_type.right, enclosing_class, source), input);
}
}
if (!accept(Token.ID)) {
skip();
return null;
}
switch (peek_token()) {
case Token.SEMICOLON:
case Token.EQUALS:
Field f = new Field(type, scanner.val(), source, scanner.start, 0);
skip();
f.end = scanner.end;
return f;
case Token.LEFT_PAREN:
Method m;
if (parse_signal)
m = new VSignal(scanner.val(), type, source);
else if (parse_delegate)
m = new Delegate(scanner.val(), type, source);
else m = new Method(scanner.val(), type, source);
return parse_method(m, input);
case Token.LEFT_BRACE:
Property p = new Property(type, scanner.val(), source, scanner.start, 0);
next_token();
p.body = parse_block();
p.end = scanner.end;
return p;
default:
skip();
return null;
}
}
bool is_modifier(Token t) {
switch (t) {
case Token.ABSTRACT:
case Token.ASYNC:
case Token.CONST:
case Token.EXTERN:
case Token.INLINE:
case Token.INTERNAL:
case Token.NEW:
case Token.OVERRIDE:
case Token.PRIVATE:
case Token.PROTECTED:
case Token.PUBLIC:
case Token.STATIC:
case Token.VIRTUAL:
return true;
default:
return false;
}
}
void skip_attributes() {
while (accept(Token.LEFT_BRACKET))
while (!scanner.eof() && next_token() != Token.RIGHT_BRACKET)
;
}
void skip_modifiers() {
while (is_modifier(peek_token()))
next_token();
}
Construct? parse_construct() {
if (!accept(Token.CONSTRUCT))
return null;
int start = scanner.start;
if (!accept(Token.LEFT_BRACE))
return null;
Block b = parse_block();
return b == null ? null : new Construct(b, start, scanner.end);
}
Node? parse_member(Class? enclosing_class) {
skip_attributes();
skip_modifiers();
Token t = peek_token();
switch (t) {
case Token.NAMESPACE:
if (enclosing_class == null) {
next_token(); // move past 'namespace'
return parse_namespace();
}
skip();
return null;
case Token.CLASS:
case Token.INTERFACE:
case Token.STRUCT:
case Token.ENUM:
next_token();
return parse_class(t, enclosing_class);
case Token.CONSTRUCT:
return parse_construct();
default:
return parse_method_or_field(enclosing_class);
}
}
Namespace? parse_containing_namespace(string name, Token container_type,
Class? enclosing_class) {
Namespace n = open_namespace(name);
Namespace parent = current_namespace;
current_namespace = n;
TypeSymbol inner = parse_class(container_type, enclosing_class);
if (inner == null)
n = null;
else {
n.symbols.add(inner);
close_namespace(n);
}
current_namespace = parent;
return n;
}
TypeSymbol? parse_class(Token container_type, Class? enclosing_class) {
if (!accept(Token.ID)) {
skip();
return null;
}
string name = scanner.val();
if (accept(Token.PERIOD))
return parse_containing_namespace(name, container_type, enclosing_class);
Class cl;
if (container_type == Token.INTERFACE)
cl = new Interface(name, source, enclosing_class);
else cl = new Class(name, source, enclosing_class);
cl.start = scanner.start;
// Make sure to discard any generic qualifiers
if (accept(Token.LESS_THAN)) {
while (accept(Token.ID) || accept(Token.COMMA))
;
accept(Token.GREATER_THAN);
}
if (accept(Token.COLON))
while (true) {
Expression type = parse_type();
if (type == null) {
skip();
return null;
}
cl.super.add(type);
if (!accept(Token.COMMA))
break;
}
if (!accept(Token.LEFT_BRACE))
return null;
if (container_type == Token.ENUM) {
while (true) {
skip_attributes();
if (!accept(Token.ID))
break;
Field f = new Field(new Id(name), scanner.val(), source, scanner.start, 0);
if (accept(Token.EQUALS))
skip_expression();
f.end = scanner.end;
cl.members.add(f);
if (!accept(Token.COMMA))
break;
}
accept(Token.SEMICOLON);
}
while (!scanner.eof() && !accept(Token.RIGHT_BRACE)) {
Node n = parse_member(cl);
if (n != null)
cl.members.add(n);
}
// make sure the class has a constructor, if not, add a default one
if (container_type == Token.CLASS) {
bool found_constructor = false;
foreach (Node n in cl.members) {
Constructor c = n as Constructor;
if (c == null)
continue;
if (c.name == null) {
found_constructor = true;
break;
}
}
if (!found_constructor) {
Constructor c = new Constructor(null, cl, source);
c.start = cl.start;
c.end = c.start;
c.update_prototype(cl.name + "()");
cl.members.add(c);
}
}
cl.end = scanner.end;
return cl;
}
static string join(string? a, string b) {
return a == null ? b : a + "." + b;
}
Namespace open_namespace(string name) {
Namespace n = new Namespace(name, join(current_namespace.full_name, name), source);
n.start = scanner.start;
return n;
}
void close_namespace(Namespace n) {
source.namespaces.add(n);
n.end = scanner.end;
}
Namespace? parse_namespace() {
if (!accept(Token.ID)) {
skip();
return null;
}
string name = scanner.val();
Namespace n = open_namespace(name);
Namespace parent = current_namespace;
current_namespace = n;
if (accept(Token.PERIOD)) {
Namespace inner = parse_namespace();
if (inner == null)
n = null;
else n.symbols.add(inner);
} else if (accept(Token.LEFT_BRACE)) {
while (!scanner.eof() && !accept(Token.RIGHT_BRACE)) {
Symbol s = parse_member(null) as Symbol;
if (s != null)
n.symbols.add(s);
}
} else {
skip();
n = null;
}
if (n != null)
close_namespace(n);
current_namespace = parent;
return n;
}
string? parse_using() {
if (!accept(Token.ID)) {
skip();
return null;
}
string s = scanner.val();
skip();
return s;
}
public void parse(SourceFile source, string input) {
this.source = source;
scanner = new Scanner(input);
while (accept(Token.USING)) {
string s = parse_using();
if (s != null)
source.add_using_namespace(s);
}
current_namespace = source.top;
while (!scanner.eof()) {
Symbol s = parse_member(null) as Symbol;
if (s != null)
source.top.symbols.add(s);
}
source.top.end = scanner.end;
}
// namespaces, interfaces/classes/structs/enums, and methods count as enclosing scopes
public ScanScope? find_enclosing_scope(string input, int pos, bool classes_only) {
scanner = new Scanner(input);
Stack<ScanScope> scopes = new Stack<ScanScope>();
int depth = 0;
bool token_is_class = false;
bool token_is_namespace = false;
while (scanner.end < pos) {
Token t = next_token();
if (t == Token.EOF)
break;
if (t == Token.CLASS)
token_is_class = true;
else if (t == Token.NAMESPACE)
token_is_namespace = true;
else if (t == Token.LEFT_BRACE)
++depth;
else if (t == Token.RIGHT_BRACE) {
--depth;
if (scopes.size() > 0 && scopes.top().depth == depth && scanner.end < pos)
scopes.pop();
// Don't bother looking at the token if it's classes only and the token isn't a class
} else if (t == Token.ID && ((!classes_only && !token_is_class) || token_is_class)) {
int position = scanner.start;
while (true) {
if (scanner.end >= pos)
return (scopes.size() > 0) ? scopes.top() : null;
if (!accept(Token.PERIOD) || !accept(Token.ID))
break;
}
int end = scanner.end;
if (!classes_only && peek_token() == Token.LEFT_PAREN) {
// skip to the end of the method declaration to check for a left brace
int unmatched_parens = 0;
while (scanner.end < pos) {
t = next_token();
if (t == Token.SEMICOLON)
break;
else if (t == Token.LEFT_PAREN)
++unmatched_parens;
else if (t == Token.RIGHT_PAREN)
if (--unmatched_parens == 0)
break;
}
// Borrow the token_is_class variable temporarily - there's no need to use
// another variable when this will be reset to false
if (peek_token() == Token.LEFT_BRACE)
token_is_class = true;
}
if (token_is_class || token_is_namespace)
scopes.push(new ScanScope(depth, position, end));
token_is_class = false;
token_is_namespace = false;
} else {
token_is_class = false;
token_is_namespace = false;
}
}
return (scopes.size() > 0) ? scopes.top() : null;
}
}
}
void main(string[] args) {
if (args.length < 2) {
stderr.puts("usage: symbol <file>\n");
return;
}
string filename = args[1];
string source;
try {
if (!FileUtils.get_contents(filename, out source)) {
stderr.puts("can't read file\n");
return;
}
} catch (FileError e) {
stderr.printf("error reading file: %s\n", e.message);
return;
}
Valencia.SourceFile sf = new Valencia.SourceFile(null, filename);
new Valencia.Parser().parse(sf, source);
sf.print(0);
}