Documentation
¶
Overview ¶
Package parser implements a Pratt (precedence-climbing) recursive descent parser for the Meow language. It consumes tokens via iter.Pull and produces an ast.Program AST.
Parsing Strategy ¶
Expressions are parsed using a Pratt parser with the following precedence levels (lowest to highest):
|| logical OR && logical AND == != equality < > <= >= comparison |=| pipe + - additive * / % multiplicative ! - (unary) prefix operators () [] call / index
Statements are dispatched by leading keyword:
nyan variable declaration meow function definition bring return sniff if / else if / else purr while loop
Error Handling ¶
Parse errors are collected as *ParseError values. When errors occur the parser attempts to continue, so multiple errors may be reported from a single parse.
Usage ¶
p := parser.New(lexer.New(src, file).Tokens())
prog, errs := p.Parse()
if errs != nil {
for _, e := range errs {
fmt.Println(e)
}
}
Index ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type ParseError ¶
type ParseError struct {
// Pos is the source location where the error occurred.
Pos token.Position
// Message is the error description.
Message string
}
ParseError represents a parser error with a cat-themed message.
func (*ParseError) Error ¶
func (e *ParseError) Error() string
Source Files
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