diff options
Diffstat (limited to 'src/shell')
| -rw-r--r-- | src/shell/main.zig | 226 |
1 files changed, 113 insertions, 113 deletions
diff --git a/src/shell/main.zig b/src/shell/main.zig index 337185b..057cb6a 100644 --- a/src/shell/main.zig +++ b/src/shell/main.zig @@ -7,94 +7,94 @@ const Literal = estd.parser.common.Literal; const ParseFn = estd.parser.ParseFn; const Keyword = enum { - if_statement, - other + if_statement, + other }; const String = struct { }; const Token = union(enum) { - openparenthesis: void, - closeparenthesis: void, - openscope: void, - closescope: void, - backslash: void, - pipe: void, - semicolon: void, - logical_and: void, - logical_or: void, - assign: void, - keyword: Keyword, - string: String, + openparenthesis: void, + closeparenthesis: void, + openscope: void, + closescope: void, + backslash: void, + pipe: void, + semicolon: void, + logical_and: void, + logical_or: void, + assign: void, + keyword: Keyword, + string: String, }; pub fn parse_string(ctx: *Context(u8)) !Token { - const snapshot = ctx.cursor.snapshot(); - errdefer ctx.cursor.rollback(snapshot); + const snapshot = ctx.cursor.snapshot(); + errdefer ctx.cursor.rollback(snapshot); - const first_char = (try ctx.cursor.consume(1))[0]; + const first_char = (try ctx.cursor.consume(1))[0]; - if (first_char == ' ') { - return error.NotAString; - } + if (first_char == ' ') { + return error.NotAString; + } - if (first_char == '"') { - while (ctx.cursor.consume(1) catch null) |c| { - if (c[0] == '\"') { - return Token.string; - } else if (c[0] == '{') { - while (ctx.cursor.consume(1) catch null) |inner| { - if (inner[0] == '}') { - break; - } - } else { - return error.UnterminatedString; - } - } - } else { - return error.UnterminatedString; - } - } else if (first_char == '\'') { - while (ctx.cursor.consume(1) catch null) |c| { - if (c[0] == '\'') { - return Token.string; - } - } else { - return error.UnterminatedString; - } - } + if (first_char == '"') { + while (ctx.cursor.consume(1) catch null) |c| { + if (c[0] == '\"') { + return Token.string; + } else if (c[0] == '{') { + while (ctx.cursor.consume(1) catch null) |inner| { + if (inner[0] == '}') { + break; + } + } else { + return error.UnterminatedString; + } + } + } else { + return error.UnterminatedString; + } + } else if (first_char == '\'') { + while (ctx.cursor.consume(1) catch null) |c| { + if (c[0] == '\'') { + return Token.string; + } + } else { + return error.UnterminatedString; + } + } - while (ctx.cursor.consume(1) catch null) |c| { - if (c[0] == ' ') { - return Token.string; - } else if (c[0] == '{') { - while (ctx.cursor.consume(1) catch null) |inner| { - if (inner[0] == '}') { - break; - } - } else { - return error.UnterminatedString; - } - } - } else { - return error.UnterminatedString; - } + while (ctx.cursor.consume(1) catch null) |c| { + if (c[0] == ' ') { + return Token.string; + } else if (c[0] == '{') { + while (ctx.cursor.consume(1) catch null) |inner| { + if (inner[0] == '}') { + break; + } + } else { + return error.UnterminatedString; + } + } + } else { + return error.UnterminatedString; + } } const unterminated_keyword = Parser(u8, Keyword, keyword_literal("if", Keyword.if_statement)); fn keyword(ctx: *Context(u8)) !Token { - const snapshot = ctx.cursor.snapshot(); - errdefer ctx.cursor.rollback(snapshot); + const snapshot = ctx.cursor.snapshot(); + errdefer ctx.cursor.rollback(snapshot); - const token = try unterminated_keyword.parse(ctx); - const next_char = (try ctx.cursor.peek(1))[0]; + const token = try unterminated_keyword.parse(ctx); + const next_char = (try ctx.cursor.peek(1))[0]; - switch (next_char) { - '(', ')', '{', '}', '\\', '&', '|', ';', '=', ' ' => return .{ .keyword = token }, - else => return error.UnterminatedKeyword, - } + switch (next_char) { + '(', ')', '{', '}', '\\', '&', '|', ';', '=', ' ' => return .{ .keyword = token }, + else => return error.UnterminatedKeyword, + } } const literal = Literal(u8, Token); @@ -102,56 +102,56 @@ const keyword_literal = Literal(u8, Keyword); const skip_literal = Literal(u8, void); const Tokenizer = Parser(u8, Token, literal("(", Token.openparenthesis)) - .or_else(literal(")", Token.closeparenthesis)) - .or_else(literal("{", Token.openscope)) - .or_else(literal("}", Token.closescope)) - .or_else(literal("\\", Token.backslash)) - .or_else(literal("&&", Token.logical_and)) - .or_else(literal("||", Token.logical_or)) - .or_else(literal("|", Token.pipe)) - .or_else(literal(";", Token.semicolon)) - .or_else(literal("=", Token.assign)) - .or_else(keyword) - .or_else(parse_string) - .and_skip(Parser(u8, void, skip_literal(" ", {})).zero_or_more().parse) - .zero_or_more() - .then_skip(Parser(u8, void, skip_literal(" ", {})).zero_or_more().parse) - .end(); +.or_else(literal(")", Token.closeparenthesis)) +.or_else(literal("{", Token.openscope)) +.or_else(literal("}", Token.closescope)) +.or_else(literal("\\", Token.backslash)) +.or_else(literal("&&", Token.logical_and)) +.or_else(literal("||", Token.logical_or)) +.or_else(literal("|", Token.pipe)) +.or_else(literal(";", Token.semicolon)) + .or_else(literal("=", Token.assign)) + .or_else(keyword) +.or_else(parse_string) + .and_skip(Parser(u8, void, skip_literal(" ", {})).zero_or_more().parse) +.zero_or_more() + .then_skip(Parser(u8, void, skip_literal(" ", {})).zero_or_more().parse) + .end(); -pub fn main() void { - std.debug.print("Hello, World!\n", .{}); -} + pub fn main() void { + std.debug.print("Hello, World!\n", .{}); + } test "tokenizer" { - const example = " | 'asdf' ( || \"hello\" ) or_something &&{ =}\\ ; if "; + const example = " | 'asdf' ( || \"hello\" ) or_something &&{ =}\\ ; if "; - var ctx = Context(u8) { - .cursor = Cursor(u8).init(example), - .allocator = std.testing.allocator, - }; + var ctx = Context(u8) { + .cursor = Cursor(u8).init(example), + .allocator = std.testing.allocator, +}; - const tokens = try Tokenizer.parse(&ctx); - defer tokens.deinit(); +const tokens = try Tokenizer.parse(&ctx); +defer tokens.deinit(); - try std.testing.expectEqualSlices( - Token, - &[_]Token { - .pipe, - .string, - .openparenthesis, - .logical_or, - .string, - .closeparenthesis, - .string, - .logical_and, - .openscope, - .assign, - .closescope, - .backslash, - .semicolon, - .{ .keyword = Keyword.if_statement } - }, - tokens.items - ); +try std.testing.expectEqualSlices( + Token, + &[_]Token { + .pipe, + .string, + .openparenthesis, + .logical_or, + .string, + .closeparenthesis, + .string, + .logical_and, + .openscope, + .assign, + .closescope, + .backslash, + .semicolon, + .{ .keyword = Keyword.if_statement } +}, +tokens.items +); } |