parser: simplify finishAssignment, add StarEqual support

This commit is contained in:
Luna 2019-08-27 11:54:21 -03:00
parent a0808b54aa
commit eb7a485206
4 changed files with 29 additions and 24 deletions

View file

@ -58,6 +58,8 @@ fn main(a int) int {
// those should yield the same ast
str.len = str.len + 1
str.len += 1
str.len -= 1
str.len *= 1
}
fn (v Typ) voidfunc() {}

View file

@ -702,7 +702,7 @@ pub const Parser = struct {
var expr = try self.parseOr();
if (self.compareAnyOf(&[_]TokenType{
.ColonEqual, .Equal, .PlusEqual, .MinusEqual,
.ColonEqual, .Equal, .PlusEqual, .MinusEqual, .StarEqual,
})) {
return try self.finishAssignment(expr, mutable);
}
@ -718,22 +718,33 @@ pub const Parser = struct {
// TODO convert binary's op field from Token to
// something else, maybe enum'd
const new_op_ttype: TokenType = switch (op.ttype) {
.ColonEqual => TokenType.ColonEqual,
.Equal => .Equal,
.PlusEqual => .Plus,
.MinusEqual => .Minus,
.StarEqual => .Star,
else => unreachable,
};
const new_lexeme: []const u8 = switch (op.ttype) {
.ColonEqual => ":=",
.Equal => "=",
.PlusEqual => "+",
.MinusEqual => "-",
.StarEqual => "*",
else => unreachable,
};
switch (expr.*) {
.Variable => {
switch (op.ttype) {
.ColonEqual => return try self.mkVarDecl(expr.Variable, value, mutable),
.Equal => return try self.mkAssign(expr.Variable, value),
.PlusEqual => {
var plus_op = try self.mkToken(.Plus, "+", op.line);
return try self.mkAssign(
expr.Variable,
try self.mkBinary(expr, plus_op, value),
);
},
.MinusEqual => {
var new_op = try self.mkToken(.Minus, "-", op.line);
.PlusEqual, .MinusEqual, .StarEqual => {
var new_op = try self.mkToken(new_op_ttype, new_lexeme, op.line);
return try self.mkAssign(
expr.Variable,
try self.mkBinary(expr, new_op, value),
@ -751,17 +762,8 @@ pub const Parser = struct {
return Result.CompileError;
},
.PlusEqual => {
var new_op = try self.mkToken(.Plus, "+", op.line);
return try self.mkSet(
get.struc,
get.name,
try self.mkBinary(expr, new_op, value),
);
},
.MinusEqual => {
var new_op = try self.mkToken(.Minus, "-", op.line);
.PlusEqual, .MinusEqual, .StarEqual => {
var new_op = try self.mkToken(new_op_ttype, new_lexeme, op.line);
return try self.mkSet(
get.struc,
get.name,

View file

@ -295,11 +295,11 @@ pub const Scanner = struct {
'?' => self.makeToken(.QuestionMark),
'$' => self.makeToken(.DollarSign),
'-' => self.makeToken(.Minus),
'*' => self.makeToken(.Star),
'%' => self.makeToken(.Modulo),
':' => self.makeMatchToken('=', .ColonEqual, .Colon),
'*' => self.makeMatchToken('=', .StarEqual, .Star),
'-' => self.makeMatchToken('=', .MinusEqual, .Minus),
// we use the existing .And and .Or tokens
// representing the and and or keywords to

View file

@ -30,6 +30,7 @@ pub const TokenType = enum {
PlusEqual,
MinusEqual,
ColonEqual,
StarEqual,
// comparison ones
EqualEqual,