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fix self hosted tokenizer handling of EOF

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This commit is contained in:
Andrew Kelley 2018-02-12 21:25:38 -05:00
parent b4e44c4e80
commit dfbb8254ca
2 changed files with 107 additions and 27 deletions
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32
std/zig/ast.zig
View File

@ -18,6 +18,7 @@ pub const Node = struct {
PrefixOp,
IntegerLiteral,
FloatLiteral,
BuiltinCall,
};
pub fn iterate(base: &Node, index: usize) ?&Node {
@ -32,21 +33,7 @@ pub const Node = struct {
Id.PrefixOp => @fieldParentPtr(NodePrefixOp, "base", base).iterate(index),
Id.IntegerLiteral => @fieldParentPtr(NodeIntegerLiteral, "base", base).iterate(index),
Id.FloatLiteral => @fieldParentPtr(NodeFloatLiteral, "base", base).iterate(index),
};
}
pub fn destroy(base: &Node, allocator: &mem.Allocator) void {
return switch (base.id) {
Id.Root => allocator.destroy(@fieldParentPtr(NodeRoot, "base", base)),
Id.VarDecl => allocator.destroy(@fieldParentPtr(NodeVarDecl, "base", base)),
Id.Identifier => allocator.destroy(@fieldParentPtr(NodeIdentifier, "base", base)),
Id.FnProto => allocator.destroy(@fieldParentPtr(NodeFnProto, "base", base)),
Id.ParamDecl => allocator.destroy(@fieldParentPtr(NodeParamDecl, "base", base)),
Id.Block => allocator.destroy(@fieldParentPtr(NodeBlock, "base", base)),
Id.InfixOp => allocator.destroy(@fieldParentPtr(NodeInfixOp, "base", base)),
Id.PrefixOp => allocator.destroy(@fieldParentPtr(NodePrefixOp, "base", base)),
Id.IntegerLiteral => allocator.destroy(@fieldParentPtr(NodeIntegerLiteral, "base", base)),
Id.FloatLiteral => allocator.destroy(@fieldParentPtr(NodeFloatLiteral, "base", base)),
Id.BuiltinCall => @fieldParentPtr(NodeBuiltinCall, "base", base).iterate(index),
};
}
};
@ -269,3 +256,18 @@ pub const NodeFloatLiteral = struct {
return null;
}
};
pub const NodeBuiltinCall = struct {
base: Node,
builtin_token: Token,
params: ArrayList(&Node),
pub fn iterate(self: &NodeBuiltinCall, index: usize) ?&Node {
var i = index;
if (i < self.params.len) return self.params.at(i);
i -= self.params.len;
return null;
}
};

102
std/zig/tokenizer.zig
View File

@ -68,6 +68,7 @@ pub const Token = struct {
Invalid,
Identifier,
StringLiteral: StrLitKind,
StringIdentifier,
Eof,
Builtin,
Bang,
@ -205,6 +206,7 @@ pub const Tokenizer = struct {
Ampersand,
Period,
Period2,
SawAtSign,
};
pub fn next(self: &Tokenizer) Token {
@ -238,8 +240,7 @@ pub const Tokenizer = struct {
result.id = Token.Id.Identifier;
},
'@' => {
state = State.Builtin;
result.id = Token.Id.Builtin;
state = State.SawAtSign;
},
'=' => {
state = State.Equal;
@ -313,6 +314,20 @@ pub const Tokenizer = struct {
break;
},
},
State.SawAtSign => switch (c) {
'"' => {
result.id = Token.Id.StringIdentifier;
state = State.StringLiteral;
},
else => {
// reinterpret as a builtin
self.index -= 1;
state = State.Builtin;
result.id = Token.Id.Builtin;
},
},
State.Ampersand => switch (c) {
'=' => {
result.id = Token.Id.AmpersandEqual;
@ -512,7 +527,59 @@ pub const Tokenizer = struct {
}
}
result.end = self.index;
if (self.index == self.buffer.len) {
switch (state) {
State.Start,
State.C,
State.IntegerLiteral,
State.IntegerLiteralWithRadix,
State.FloatFraction,
State.FloatExponentNumber,
State.StringLiteral, // find this error later
State.Builtin => {},
State.Identifier => {
if (Token.getKeyword(self.buffer[result.start..self.index])) |id| {
result.id = id;
}
},
State.LineComment => {
result.id = Token.Id.Eof;
},
State.NumberDot,
State.FloatExponentUnsigned,
State.SawAtSign,
State.StringLiteralBackslash => {
result.id = Token.Id.Invalid;
},
State.Equal => {
result.id = Token.Id.Equal;
},
State.Bang => {
result.id = Token.Id.Bang;
},
State.Minus => {
result.id = Token.Id.Minus;
},
State.Slash => {
result.id = Token.Id.Slash;
},
State.Zero => {
result.id = Token.Id.IntegerLiteral;
},
State.Ampersand => {
result.id = Token.Id.Ampersand;
},
State.Period => {
result.id = Token.Id.Period;
},
State.Period2 => {
result.id = Token.Id.Ellipsis2;
},
}
}
if (result.id == Token.Id.Eof) {
if (self.pending_invalid_token) |token| {
self.pending_invalid_token = null;
@ -551,7 +618,7 @@ pub const Tokenizer = struct {
} else {
// check utf8-encoded character.
const length = std.unicode.utf8ByteSequenceLength(c0) catch return 1;
if (self.index + length >= self.buffer.len) {
if (self.index + length > self.buffer.len) {
return u3(self.buffer.len - self.index);
}
const bytes = self.buffer[self.index..self.index + length];
@ -632,15 +699,25 @@ test "tokenizer - illegal unicode codepoints" {
testTokenize("//\xe2\x80\xaa", []Token.Id{});
}
fn testTokenize(source: []const u8, expected_tokens: []const Token.Id) void {
// (test authors, just make this bigger if you need it)
var padded_source: [0x100]u8 = undefined;
std.mem.copy(u8, padded_source[0..source.len], source);
padded_source[source.len + 0] = '\n';
padded_source[source.len + 1] = '\n';
padded_source[source.len + 2] = '\n';
test "tokenizer - string identifier and builtin fns" {
testTokenize(
\\const @"if" = @import("std");
,
[]Token.Id{
Token.Id.Keyword_const,
Token.Id.StringIdentifier,
Token.Id.Equal,
Token.Id.Builtin,
Token.Id.LParen,
Token.Id {.StringLiteral = Token.StrLitKind.Normal},
Token.Id.RParen,
Token.Id.Semicolon,
}
);
}
var tokenizer = Tokenizer.init(padded_source[0..source.len + 3]);
fn testTokenize(source: []const u8, expected_tokens: []const Token.Id) void {
var tokenizer = Tokenizer.init(source);
for (expected_tokens) |expected_token_id| {
const token = tokenizer.next();
std.debug.assert(@TagType(Token.Id)(token.id) == @TagType(Token.Id)(expected_token_id));
@ -651,5 +728,6 @@ fn testTokenize(source: []const u8, expected_tokens: []const Token.Id) void {
else => {},
}
}
std.debug.assert(tokenizer.next().id == Token.Id.Eof);
const last_token = tokenizer.next();
std.debug.assert(last_token.id == Token.Id.Eof);
}