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parser: make parseExpr return Expr instead of Node

This commit is contained in:
Luna 2019-08-26 14:46:00 -03:00
parent 3cd19e6515
commit b382c136ec
1 changed files with 18 additions and 14 deletions
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32
src/parser.zig
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@ -129,6 +129,8 @@ pub const Parser = struct {
return false;
}
// TODO maybe move helper functions to ast_helper.zig?
fn mkFnDecl(
self: *Parser,
name: Token,
@ -411,17 +413,20 @@ pub const Parser = struct {
errdefer consts.deinit();
_ = try self.consumeSingle(.Const);
_ = try self.consumeSingle(.LeftParen);
while (self.peek().ttype != .RightParen) {
const const_name = try self.consumeSingle(.Identifier);
_ = try self.consumeSingle(.Equal);
// const declarations dont have type, a future type system must
// check the output type of the expression and assign it to the
// const later on.
var expr = try self.parseExpr();
try consts.append(ast.SingleConst{
.name = const_name,
.expr = expr.Expr,
.expr = expr,
});
}
@ -522,7 +527,7 @@ pub const Parser = struct {
fn parseIfStmt(self: *@This()) !*Stmt {
_ = try self.consumeSingle(.If);
var condition = (try self.parseExpr()).Expr;
var condition = try self.parseExpr();
const then_branch = try self.parseStmtBlock();
@ -550,7 +555,7 @@ pub const Parser = struct {
if (self.check(.LeftBrace)) {
body = try self.parseStmtBlock();
} else {
expr = (try self.parseExpr()).Expr;
expr = try self.parseExpr();
body = try self.parseStmtBlock();
}
@ -559,7 +564,7 @@ pub const Parser = struct {
fn parseReturn(self: *@This()) !*Stmt {
const tok = try self.consumeSingle(.Return);
const expr = (try self.parseExpr()).Expr;
const expr = try self.parseExpr();
return try Stmt.mkReturn(self.allocator, tok, expr);
}
@ -567,20 +572,19 @@ pub const Parser = struct {
_ = try self.consumeSingle(.Println);
_ = try self.consumeSingle(.LeftParen);
var expr = (try self.parseExpr()).Expr;
var expr = try self.parseExpr();
_ = try self.consumeSingle(.RightParen);
return try Stmt.mkPrintln(self.allocator, expr);
}
fn parseStmtExpr(self: *@This()) !*Stmt {
var expr = (try self.parseExpr()).Expr;
var expr = try self.parseExpr();
return try self.mkStmtExpr(expr);
}
fn parseExpr(self: *@This()) anyerror!*Node {
var expr: *Expr = try self.parseAssignment();
return self.mkExpr(expr);
fn parseExpr(self: *@This()) anyerror!*Expr {
return try self.parseAssignment();
}
fn parseAssignment(self: *@This()) anyerror!*Expr {
@ -784,13 +788,13 @@ pub const Parser = struct {
if (!self.check(.RightParen)) {
// emulating do-while really badly
var arg = (try self.parseExpr()).Expr;
var arg = try self.parseExpr();
try args.append(arg);
while (self.check(.Comma)) {
_ = try self.consumeSingle(.Comma);
arg = (try self.parseExpr()).Expr;
arg = try self.parseExpr();
try args.append(arg);
}
}
@ -817,7 +821,7 @@ pub const Parser = struct {
// TODO check .Comma for the quick initialization {val,val,val}
_ = try self.consumeSingle(.Colon);
const field_value = (try self.parseExpr()).Expr;
const field_value = try self.parseExpr();
try inits.append(ast.StructInit{
.field = field_name,
@ -845,7 +849,7 @@ pub const Parser = struct {
.LeftParen => blk: {
_ = try self.nextToken();
var expr = (try self.parseExpr()).Expr;
var expr = try self.parseExpr();
_ = try self.consume(.RightParen, "Expected ')' after expression");
// for groupings, we don't want to skip tokens as we already