Fix peg.pl0 test failures
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! Copyright (C) 2007 Chris Double.
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! See http://factorcode.org/license.txt for BSD license.
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!
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USING: kernel tools.test peg peg.pl0 multiline sequences ;
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USING: kernel tools.test peg peg.pl0 multiline sequences words assocs ;
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IN: peg.pl0.tests
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{ f } [
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"CONST foo = 1;" \ pl0 "ebnf-parser" word-prop "block" swap at parse not
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] unit-test
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{ f } [
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"VAR foo;" \ pl0 "ebnf-parser" word-prop "block" swap at parse not
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] unit-test
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{ f } [
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"VAR foo,bar , baz;" \ pl0 "ebnf-parser" word-prop "block" swap at parse not
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] unit-test
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{ f } [
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"foo := 5;" \ pl0 "ebnf-parser" word-prop "statement" swap at parse not
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] unit-test
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{ f } [
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"BEGIN foo := 5; END" \ pl0 "ebnf-parser" word-prop "statement" swap at parse not
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] unit-test
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{ f } [
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"IF 1=1 THEN foo := 5; END" \ pl0 "ebnf-parser" word-prop "statement" swap at parse not
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] unit-test
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{ f } [
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"WHILE 1=1 DO foo := 5; END" \ pl0 "ebnf-parser" word-prop "statement" swap at parse not
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] unit-test
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{ f } [
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"WHILE ODD 1=1 DO foo := 5; END" \ pl0 "ebnf-parser" word-prop "statement" swap at parse not
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] unit-test
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{ f } [
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"PROCEDURE square; BEGIN squ=x*x END" \ pl0 "ebnf-parser" word-prop "block" swap at parse not
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] unit-test
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{ f } [
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<"
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PROCEDURE square;
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BEGIN
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squ := x * x
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END;
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"> \ pl0 "ebnf-parser" word-prop "block" swap at parse not
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] unit-test
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{ t } [
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<"
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VAR x, squ;
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@ -7,18 +7,20 @@ IN: peg.pl0
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#! Grammar for PL/0 based on http://en.wikipedia.org/wiki/PL/0
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EBNF: pl0
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block = ( "CONST" ident "=" number ( "," ident "=" number )* ";" )?
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( "VAR" ident ( "," ident )* ";" )?
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( "PROCEDURE" ident ";" ( block ";" )? )* statement
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statement = ( ident ":=" expression | "CALL" ident |
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"BEGIN" statement (";" statement )* "END" |
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"IF" condition "THEN" statement |
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"WHILE" condition "DO" statement )?
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condition = "ODD" expression |
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expression ("=" | "#" | "<=" | "<" | ">=" | ">") expression
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expression = ("+" | "-")? term (("+" | "-") term )*
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term = factor (("*" | "/") factor )*
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factor = ident | number | "(" expression ")"
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- = (" " | "\t" | "\n")+ => [[ drop ignore ]]
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_ = (" " | "\t" | "\n")* => [[ drop ignore ]]
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block = ( _ "CONST" - ident _ "=" _ number ( _ "," _ ident _ "=" _ number )* _ ";" )?
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( _ "VAR" - ident ( _ "," _ ident )* _ ";" )?
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( _ "PROCEDURE" - ident _ ";" ( _ block _ ";" )? )* _ statement
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statement = ( ident _ ":=" _ expression | "CALL" - ident |
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"BEGIN" - statement ( _ ";" _ statement )* _ "END" |
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"IF" - condition _ "THEN" - statement |
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"WHILE" - condition _ "DO" - statement )?
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condition = "ODD" - expression |
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expression _ ("=" | "#" | "<=" | "<" | ">=" | ">") _ expression
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expression = ("+" | "-")? term ( _ ("+" | "-") _ term )*
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term = factor ( _ ("*" | "/") _ factor )*
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factor = ident | number | "(" _ expression _ ")"
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ident = (([a-zA-Z])+) [[ >string ]]
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digit = ([0-9]) [[ digit> ]]
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number = ((digit)+) [[ unclip [ swap 10 * + ] reduce ]]
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