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| author | ptmcg <ptmcg@austin.rr.com> | 2022-05-08 16:50:59 -0500 |
|---|---|---|
| committer | ptmcg <ptmcg@austin.rr.com> | 2022-05-08 16:50:59 -0500 |
| commit | 17737d5d18cd1fc21f555c805fd3067a3f36e626 (patch) | |
| tree | b8574f0b6e403b0466834211d5112cb1b9d59a7e | |
| parent | a147c9d335f70ececa4e3315d988e5a9a134a83e (diff) | |
| download | pyparsing-git-17737d5d18cd1fc21f555c805fd3067a3f36e626.tar.gz | |
Added Lox language parser (from Crafting Interpreters, by Robert Nystrom)
| -rw-r--r-- | examples/lox_parser.py | 220 | ||||
| -rw-r--r-- | examples/lox_program_parser.html | 2911 |
2 files changed, 220 insertions, 2911 deletions
diff --git a/examples/lox_parser.py b/examples/lox_parser.py new file mode 100644 index 0000000..3b5825a --- /dev/null +++ b/examples/lox_parser.py @@ -0,0 +1,220 @@ +""" +The Lox language grammar + +From Robert Nystrom's "Crafting Interpreters" +http://craftinginterpreters.com/ + +The BNF for the Lox language is found at http://craftinginterpreters.com/appendix-i.html +""" +import pyparsing as pp +pp.ParserElement.enable_packrat() + +# punctuation +COMMA, LPAR, RPAR, LBRACE, RBRACE, EQ, SEMI = map(pp.Suppress, ",(){}=;") + +keywords = (CLASS, FUN, VAR, FOR, IF, ELSE, PRINT, RETURN, WHILE, TRUE, FALSE, NIL, THIS, SUPER, AND, OR,) = map( + pp.Keyword, + """class fun var for if else print return while true false nil this super and or""".split() +) +keyword = pp.MatchFirst(keywords) + +identifier = pp.Combine(~keyword + pp.Word(pp.alphas + "_", pp.alphanums + "_'")) +string = pp.QuotedString('"') +number = pp.Regex(r"\d+(\.\d+)?") + +declaration = pp.Forward() +statement = pp.Forward() +class_decl = pp.Forward() +expression = pp.Forward() +block = pp.Forward() + +arguments = pp.delimited_list(expression) +parameters = pp.delimited_list(identifier) +function = identifier + LPAR + pp.Opt(parameters) + RPAR + block +property_ = identifier + block + +fun_decl = FUN + function +var_decl = VAR + identifier + pp.Opt(EQ + expression) + SEMI +class_decl <<= ( + CLASS + - identifier + + pp.Opt("<" + identifier) + + LBRACE + + (function | property_ | class_decl)[...] + + RBRACE +) + + +primary = (TRUE | FALSE | NIL | THIS | number | string | identifier + | SUPER + "." + identifier + # | LPAR + expression + RPAR <-- not needed, infix_notation takes care of this + ) +call = primary + ( + LPAR + pp.Opt(arguments) + RPAR + | "." + identifier +)[1, ...] + +arith_expression = pp.infix_notation( + call | primary, + [ + (pp.one_of("! -"), 1, pp.opAssoc.RIGHT), + (pp.one_of("/ *"), 2, pp.opAssoc.LEFT), + (pp.one_of("- +"), 2, pp.opAssoc.LEFT), + (pp.one_of("> >= < <="), 2, pp.opAssoc.LEFT), + (pp.one_of("!= =="), 2, pp.opAssoc.LEFT), + (AND, 2, pp.opAssoc.LEFT), + (OR, 2, pp.opAssoc.LEFT), + ] +) +assignment = pp.Forward() +assignment <<= (call | identifier) + EQ + (assignment | arith_expression) + +expression <<= assignment ^ arith_expression ^ function + +block <<= pp.Group(LBRACE + declaration[...] + RBRACE) +while_statement = WHILE + LPAR + expression + RPAR + statement +return_statement = RETURN + pp.Opt(expression) + SEMI +print_statement = PRINT + expression + SEMI +if_statement = IF + LPAR + expression + RPAR + statement + pp.Opt(ELSE + statement) +expr_statement = expression + ";" +for_statement = FOR + LPAR + pp.Group( + (var_decl | expr_statement | ";") + + pp.Opt(expression) + ";" + + pp.Opt(expression) +) + RPAR + statement + + +statement <<= pp.Group( + expr_statement + | for_statement + | if_statement + | print_statement + | return_statement + | while_statement + | block +) + +declaration <<= ( + class_decl + | fun_decl + | var_decl + | statement +) + +program = declaration[...] +program.ignore(pp.dbl_slash_comment) + +pp.autoname_elements() +program.create_diagram("lox_program_parser.html", show_groups=True, vertical=3) + + +program.run_tests( + [ + """\ + var a = 1; + { + var a = a + 2; + print a; + } + """, + """\ + { + var i = 0; + while (i < 10) { + print i; + i = i + 1; + } + } + """, + """\ + var a = 0; + var temp; + + for (var b = 1; a < 10000; b = temp + b) { + print a; + temp = a; + a = b; + } + """, + """\ + fun add(a, b, c) { + print a + b + c; + } + + add(1, 2, 3); + """, + """\ + fun count(n) { + while (n < 100) { + if (n == 3) return n; // <-- + print n; + n = n + 1; + } + } + + count(1); + """, + """\ + fun fib(n) { + if (n <= 1) return n; + return fib(n - 2) + fib(n - 1); + } + + for (var i = 0; i < 20; i = i + 1) { + print fib(i); + } + """, + """\ + fun makeCounter() { + var i = 0; + fun count() { + i = i + 1; + print i; + } + + return count; + } + + var counter = makeCounter(); + counter(); // "1". + counter(); // "2". + """, + """\ + fun thrice(fn) { + for (var i = 1; i <= 3; i = i + 1) { + fn(i); + } + } + + thrice(fun (a) { + print a; + }); + // "1". + // "2". + // "3". + """, + """\ + class Math { + square(n) { + return n * n; + } + } + + print Math.square(3); // Prints "9". + """, + """\ + class Circle { + init(radius) { + this.radius = radius; + } + + area { + return 3.141592653 * this.radius * this.radius; + } + } + + var circle = Circle(4); + print circle.area; // Prints roughly "50.2655". + """, + ] +) diff --git a/examples/lox_program_parser.html b/examples/lox_program_parser.html deleted file mode 100644 index 996e659..0000000 --- a/examples/lox_program_parser.html +++ /dev/null @@ -1,2911 +0,0 @@ -<!DOCTYPE html> -<html> -<head> - - <style type="text/css"> - .railroad-heading { - font-family: monospace; - } - </style> - -</head> -<body> - - - <div class="railroad-group"> - <h1 class="railroad-heading">program</h1> - <div class="railroad-description"></div> - <div 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