mirror of
https://github.com/jashkenas/coffeescript.git
synced 2026-05-03 03:00:14 -04:00
grammar: improved formatting consistency, using single quotes unless interpolated and wrapping lines that are too long
This commit is contained in:
satyr
@@ -56,32 +56,32 @@ grammar =
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# The **Root** is the top-level node in the syntax tree. Since we parse bottom-up,
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# all parsing must end here.
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Root: [
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o "", -> new Expressions
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o "TERMINATOR", -> new Expressions
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o "Body"
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o "Block TERMINATOR"
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o '', -> new Expressions
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o 'TERMINATOR', -> new Expressions
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o 'Body'
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o 'Block TERMINATOR'
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]
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# Any list of statements and expressions, seperated by line breaks or semicolons.
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Body: [
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o "Line", -> Expressions.wrap [$1]
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o "Body TERMINATOR Line", -> $1.push $3
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o "Body TERMINATOR"
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o 'Line', -> Expressions.wrap [$1]
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o 'Body TERMINATOR Line', -> $1.push $3
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o 'Body TERMINATOR'
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]
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# Expressions and statements, which make up a line in a body.
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Line: [
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o "Expression"
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o "Statement"
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o 'Expression'
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o 'Statement'
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]
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# Pure statements which cannot be expressions.
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Statement: [
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o "Return"
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o "Throw"
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o "BREAK", -> new Literal $1
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o "CONTINUE", -> new Literal $1
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o "DEBUGGER", -> new Literal $1
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o 'Return'
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o 'Throw'
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o 'BREAK', -> new Literal $1
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o 'CONTINUE', -> new Literal $1
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o 'DEBUGGER', -> new Literal $1
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]
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# All the different types of expressions in our language. The basic unit of
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@@ -89,56 +89,55 @@ grammar =
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# is one. Expressions serve as the building blocks of many other rules, making
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# them somewhat circular.
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Expression: [
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o "Value"
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o "Invocation"
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o "Code"
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o "Operation"
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o "Assign"
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o "If"
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o "Try"
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o "While"
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o "For"
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o "Switch"
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o "Extends"
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o "Class"
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o "Existence"
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o "Comment"
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o 'Value'
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o 'Invocation'
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o 'Code'
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o 'Operation'
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o 'Assign'
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o 'If'
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o 'Try'
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o 'While'
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o 'For'
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o 'Switch'
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o 'Extends'
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o 'Class'
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o 'Comment'
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]
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# An indented block of expressions. Note that the [Rewriter](rewriter.html)
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# will convert some postfix forms into blocks for us, by adjusting the
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# token stream.
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Block: [
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o "INDENT Body OUTDENT", -> $2
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o "INDENT OUTDENT", -> new Expressions
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o "TERMINATOR Comment", -> Expressions.wrap [$2]
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o 'INDENT Body OUTDENT', -> $2
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o 'INDENT OUTDENT', -> new Expressions
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o 'TERMINATOR Comment', -> Expressions.wrap [$2]
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]
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# A literal identifier, a variable name or property.
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Identifier: [
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o "IDENTIFIER", -> new Literal $1
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o 'IDENTIFIER', -> new Literal $1
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]
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# Alphanumerics are separated from the other **Literal** matchers because
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# they can also serve as keys in object literals.
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AlphaNumeric: [
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o "NUMBER", -> new Literal $1
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o "STRING", -> new Literal $1
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o 'NUMBER', -> new Literal $1
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o 'STRING', -> new Literal $1
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]
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# All of our immediate values. These can (in general), be passed straight
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# through and printed to JavaScript.
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Literal: [
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o "AlphaNumeric"
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o "JS", -> new Literal $1
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o "REGEX", -> new Literal $1
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o "BOOL", -> new Literal $1
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o 'AlphaNumeric'
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o 'JS', -> new Literal $1
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o 'REGEX', -> new Literal $1
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o 'BOOL', -> new Literal $1
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]
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# Assignment of a variable, property, or index to a value.
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Assign: [
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o "Assignable = Expression", -> new Assign $1, $3
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o "Assignable = INDENT Expression OUTDENT", -> new Assign $1, $4
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o 'Assignable = Expression', -> new Assign $1, $3
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o 'Assignable = INDENT Expression OUTDENT', -> new Assign $1, $4
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]
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# Assignment when it happens within an object literal. The difference from
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@@ -160,33 +159,28 @@ grammar =
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# A return statement from a function body.
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Return: [
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o "RETURN Expression", -> new Return $2
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o "RETURN", -> new Return
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o 'RETURN Expression', -> new Return $2
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o 'RETURN', -> new Return
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]
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# A block comment.
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Comment: [
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o "HERECOMMENT", -> new Comment $1
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]
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# [The existential operator](http://jashkenas.github.com/coffee-script/#existence).
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Existence: [
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o "Expression ?", -> new Existence $1
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o 'HERECOMMENT', -> new Comment $1
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]
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# The **Code** node is the function literal. It's defined by an indented block
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# of **Expressions** preceded by a function arrow, with an optional parameter
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# list.
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Code: [
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o "PARAM_START ParamList PARAM_END FuncGlyph Block", -> new Code $2, $5, $4
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o "FuncGlyph Block", -> new Code [], $2, $1
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o 'PARAM_START ParamList PARAM_END FuncGlyph Block', -> new Code $2, $5, $4
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o 'FuncGlyph Block', -> new Code [], $2, $1
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]
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# CoffeeScript has two different symbols for functions. `->` is for ordinary
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# functions, and `=>` is for functions bound to the current value of *this*.
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FuncGlyph: [
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o "->", -> 'func'
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o "=>", -> 'boundfunc'
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o '->', -> 'func'
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o '=>', -> 'boundfunc'
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]
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# An optional, trailing comma.
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@@ -197,31 +191,31 @@ grammar =
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# The list of parameters that a function accepts can be of any length.
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ParamList: [
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o "", -> []
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o "Param", -> [$1]
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o "ParamList , Param", -> $1.concat $3
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o '', -> []
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o 'Param', -> [$1]
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o 'ParamList , Param', -> $1.concat $3
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]
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# A single parameter in a function definition can be ordinary, or a splat
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# that hoovers up the remaining arguments.
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Param: [
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o "PARAM", -> new Literal $1
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o "@ PARAM", -> new Param $2, true
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o "PARAM ...", -> new Param $1, false, true
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o "@ PARAM ...", -> new Param $2, true, true
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o 'PARAM', -> new Literal $1
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o 'PARAM ...', -> new Param $1, false, true
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o '@ PARAM', -> new Param $2, true
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o '@ PARAM ...', -> new Param $2, true, true
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]
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# A splat that occurs outside of a parameter list.
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Splat: [
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o "Expression ...", -> new Splat $1
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o 'Expression ...', -> new Splat $1
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]
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# Variables and properties that can be assigned to.
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SimpleAssignable: [
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o "Identifier", -> new Value $1
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o "Value Accessor", -> $1.push $2
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o "Invocation Accessor", -> new Value $1, [$2]
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o "ThisProperty"
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o 'Identifier', -> new Value $1
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o 'Value Accessor', -> $1.push $2
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o 'Invocation Accessor', -> new Value $1, [$2]
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o 'ThisProperty'
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]
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# Everything that can be assigned to.
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@@ -234,159 +228,161 @@ grammar =
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# The types of things that can be treated as values -- assigned to, invoked
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# as functions, indexed into, named as a class, etc.
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Value: [
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o "Assignable"
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o "Literal", -> new Value $1
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o "Parenthetical", -> new Value $1
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o "This"
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o 'Assignable'
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o 'Literal', -> new Value $1
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o 'Parenthetical', -> new Value $1
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o 'This'
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]
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# The general group of accessors into an object, by property, by prototype
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# or by array index or slice.
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Accessor: [
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o "PROPERTY_ACCESS Identifier", -> new Accessor $2
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o "PROTOTYPE_ACCESS Identifier", -> new Accessor $2, 'prototype'
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o "::", -> new Accessor(new Literal('prototype'))
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o "SOAK_ACCESS Identifier", -> new Accessor $2, 'soak'
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o "Index"
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o 'PROPERTY_ACCESS Identifier', -> new Accessor $2
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o 'PROTOTYPE_ACCESS Identifier', -> new Accessor $2, 'prototype'
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o '::', -> new Accessor new Literal 'prototype'
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o 'SOAK_ACCESS Identifier', -> new Accessor $2, 'soak'
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o 'Index'
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]
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# Indexing into an object or array using bracket notation.
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Index: [
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o "INDEX_START Expression INDEX_END", -> new Index $2
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o "INDEX_SOAK Index", -> extend $2, soakNode: yes
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o "INDEX_PROTO Index", -> extend $2, proto: yes
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o 'INDEX_START Expression INDEX_END', -> new Index $2
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o 'INDEX_SOAK Index', -> extend $2, soakNode: yes
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o 'INDEX_PROTO Index', -> extend $2, proto: yes
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]
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# In CoffeeScript, an object literal is simply a list of assignments.
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Object: [
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o "{ AssignList OptComma }", -> new Obj $2
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o '{ AssignList OptComma }', -> new Obj $2
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]
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# Assignment of properties within an object literal can be separated by
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# comma, as in JavaScript, or simply by newline.
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AssignList: [
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o "", -> []
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o "AssignObj", -> [$1]
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o "AssignList , AssignObj", -> $1.concat $3
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o "AssignList OptComma TERMINATOR AssignObj", -> $1.concat $4
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o "AssignList OptComma INDENT AssignList OptComma OUTDENT", -> $1.concat $4
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o '', -> []
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o 'AssignObj', -> [$1]
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o 'AssignList , AssignObj', -> $1.concat $3
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o 'AssignList OptComma TERMINATOR AssignObj', -> $1.concat $4
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o 'AssignList OptComma INDENT AssignList OptComma OUTDENT', -> $1.concat $4
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]
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# Class definitions have optional bodies of prototype property assignments,
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# and optional references to the superclass.
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Class: [
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o 'CLASS SimpleAssignable', -> new Class $2
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o 'CLASS SimpleAssignable EXTENDS Value', -> new Class $2, $4
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o 'CLASS SimpleAssignable', -> new Class $2
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o 'CLASS SimpleAssignable EXTENDS Value', -> new Class $2, $4
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o 'CLASS SimpleAssignable
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INDENT ClassBody OUTDENT', -> new Class $2, null, $4
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INDENT ClassBody OUTDENT', -> new Class $2, null, $4
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o 'CLASS SimpleAssignable EXTENDS Value
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INDENT ClassBody OUTDENT', -> new Class $2, $4, $6
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o 'CLASS INDENT ClassBody OUTDENT', -> new Class null, null, $3
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o 'CLASS', -> new Class null, null, new Expressions
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o 'CLASS EXTENDS Value', -> new Class null, $3 , new Expressions
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INDENT ClassBody OUTDENT', -> new Class $2, $4, $6
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o 'CLASS INDENT ClassBody OUTDENT', -> new Class null, null, $3
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o 'CLASS', -> new Class null, null, new Expressions
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o 'CLASS EXTENDS Value', -> new Class null, $3 , new Expressions
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o 'CLASS EXTENDS Value
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INDENT ClassBody OUTDENT', -> new Class null, $3, $5
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INDENT ClassBody OUTDENT', -> new Class null, $3, $5
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]
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# Assignments that can happen directly inside a class declaration.
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ClassAssign: [
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o "AssignObj", -> $1
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o "ThisProperty : Expression", -> new Assign new Value($1), $3, 'this'
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o "ThisProperty : INDENT Expression OUTDENT", -> new Assign new Value($1), $4, 'this'
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o 'AssignObj', -> $1
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o 'ThisProperty : Expression', -> new Assign new Value($1), $3, 'this'
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o 'ThisProperty : INDENT Expression OUTDENT', -> new Assign new Value($1), $4, 'this'
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]
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# A list of assignments to a class.
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ClassBody: [
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o "", -> []
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o "ClassAssign", -> [$1]
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o "ClassBody TERMINATOR ClassAssign", -> $1.concat $3
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o "{ ClassBody }", -> $2
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o '', -> []
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o 'ClassAssign', -> [$1]
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o 'ClassBody TERMINATOR ClassAssign', -> $1.concat $3
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o '{ ClassBody }', -> $2
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]
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# Extending an object by setting its prototype chain to reference a parent
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# object.
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Extends: [
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o "SimpleAssignable EXTENDS Value", -> new Extends $1, $3
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o 'SimpleAssignable EXTENDS Value', -> new Extends $1, $3
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]
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# Ordinary function invocation, or a chained series of calls.
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Invocation: [
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o "Value OptFuncExist Arguments", -> new Call $1, $3, $2
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o "Invocation OptFuncExist Arguments", -> new Call $1, $3, $2
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o "SUPER", -> new Call 'super', [new Splat(new Literal('arguments'))]
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o "SUPER Arguments", -> new Call 'super', $2
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o 'Value OptFuncExist Arguments', -> new Call $1, $3, $2
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o 'Invocation OptFuncExist Arguments', -> new Call $1, $3, $2
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o 'SUPER', ->
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new Call 'super', [new Splat new Literal 'arguments']
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o 'SUPER Arguments', ->
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new Call 'super', $2
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]
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# An optional existence check on a function.
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OptFuncExist: [
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o "", -> no
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o "FUNC_EXIST", -> yes
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o '', -> no
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o 'FUNC_EXIST', -> yes
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]
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# The list of arguments to a function call.
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Arguments: [
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o "CALL_START CALL_END", -> []
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o "CALL_START ArgList OptComma CALL_END", -> $2
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o 'CALL_START CALL_END', -> []
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o 'CALL_START ArgList OptComma CALL_END', -> $2
|
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]
|
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|
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# A reference to the *this* current object.
|
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This: [
|
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o "THIS", -> new Value new Literal 'this'
|
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o "@", -> new Value new Literal 'this'
|
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o 'THIS', -> new Value new Literal 'this'
|
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o '@', -> new Value new Literal 'this'
|
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]
|
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|
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# A reference to a property on *this*.
|
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ThisProperty: [
|
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o "@ Identifier", -> new Value new Literal('this'), [new Accessor($2)], 'this'
|
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o '@ Identifier', -> new Value new Literal('this'), [new Accessor($2)], 'this'
|
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]
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# The array literal.
|
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Array: [
|
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o "[ ]", -> new Arr []
|
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o "[ ArgList OptComma ]", -> new Arr $2
|
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o '[ ]', -> new Arr []
|
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o '[ ArgList OptComma ]', -> new Arr $2
|
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]
|
||||
|
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# The **ArgList** is both the list of objects passed into a function call,
|
||||
# as well as the contents of an array literal
|
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# (i.e. comma-separated expressions). Newlines work as well.
|
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ArgList: [
|
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o "Arg", -> [$1]
|
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o "ArgList , Arg", -> $1.concat $3
|
||||
o "ArgList OptComma TERMINATOR Arg", -> $1.concat $4
|
||||
o "INDENT ArgList OptComma OUTDENT", -> $2
|
||||
o "ArgList OptComma INDENT ArgList OptComma OUTDENT", -> $1.concat $4
|
||||
o 'Arg', -> [$1]
|
||||
o 'ArgList , Arg', -> $1.concat $3
|
||||
o 'ArgList OptComma TERMINATOR Arg', -> $1.concat $4
|
||||
o 'INDENT ArgList OptComma OUTDENT', -> $2
|
||||
o 'ArgList OptComma INDENT ArgList OptComma OUTDENT', -> $1.concat $4
|
||||
]
|
||||
|
||||
# Valid arguments are Expressions or Splats.
|
||||
Arg: [
|
||||
o "Expression"
|
||||
o "Splat"
|
||||
o 'Expression'
|
||||
o 'Splat'
|
||||
]
|
||||
|
||||
# Just simple, comma-separated, required arguments (no fancy syntax). We need
|
||||
# this to be separate from the **ArgList** for use in **Switch** blocks, where
|
||||
# having the newlines wouldn't make sense.
|
||||
SimpleArgs: [
|
||||
o "Expression"
|
||||
o "SimpleArgs , Expression", -> [].concat $1, $3
|
||||
o 'Expression'
|
||||
o 'SimpleArgs , Expression', -> [].concat $1, $3
|
||||
]
|
||||
|
||||
# The variants of *try/catch/finally* exception handling blocks.
|
||||
Try: [
|
||||
o "TRY Block", -> new Try $2
|
||||
o "TRY Block Catch", -> new Try $2, $3[0], $3[1]
|
||||
o "TRY Block FINALLY Block", -> new Try $2, null, null, $4
|
||||
o "TRY Block Catch FINALLY Block", -> new Try $2, $3[0], $3[1], $5
|
||||
o 'TRY Block', -> new Try $2
|
||||
o 'TRY Block Catch', -> new Try $2, $3[0], $3[1]
|
||||
o 'TRY Block FINALLY Block', -> new Try $2, null, null, $4
|
||||
o 'TRY Block Catch FINALLY Block', -> new Try $2, $3[0], $3[1], $5
|
||||
]
|
||||
|
||||
# A catch clause names its error and runs a block of code.
|
||||
Catch: [
|
||||
o "CATCH Identifier Block", -> [$2, $3]
|
||||
o 'CATCH Identifier Block', -> [$2, $3]
|
||||
]
|
||||
|
||||
# Throw an exception object.
|
||||
Throw: [
|
||||
o "THROW Expression", -> new Throw $2
|
||||
o 'THROW Expression', -> new Throw $2
|
||||
]
|
||||
|
||||
# Parenthetical expressions. Note that the **Parenthetical** is a **Value**,
|
||||
@@ -394,29 +390,29 @@ grammar =
|
||||
# where only values are accepted, wrapping it in parentheses will always do
|
||||
# the trick.
|
||||
Parenthetical: [
|
||||
o "( Expression )", -> new Parens $2
|
||||
o '( Expression )', -> new Parens $2
|
||||
]
|
||||
|
||||
# The condition portion of a while loop.
|
||||
WhileSource: [
|
||||
o "WHILE Expression", -> new While $2
|
||||
o "WHILE Expression WHEN Expression", -> new While $2, guard: $4
|
||||
o "UNTIL Expression", -> new While $2, invert: true
|
||||
o "UNTIL Expression WHEN Expression", -> new While $2, invert: true, guard: $4
|
||||
o 'WHILE Expression', -> new While $2
|
||||
o 'WHILE Expression WHEN Expression', -> new While $2, guard: $4
|
||||
o 'UNTIL Expression', -> new While $2, invert: true
|
||||
o 'UNTIL Expression WHEN Expression', -> new While $2, invert: true, guard: $4
|
||||
]
|
||||
|
||||
# The while loop can either be normal, with a block of expressions to execute,
|
||||
# or postfix, with a single expression. There is no do..while.
|
||||
While: [
|
||||
o "WhileSource Block", -> $1.addBody $2
|
||||
o "Statement WhileSource", -> $2.addBody Expressions.wrap [$1]
|
||||
o "Expression WhileSource", -> $2.addBody Expressions.wrap [$1]
|
||||
o "Loop", -> $1
|
||||
o 'WhileSource Block', -> $1.addBody $2
|
||||
o 'Statement WhileSource', -> $2.addBody Expressions.wrap [$1]
|
||||
o 'Expression WhileSource', -> $2.addBody Expressions.wrap [$1]
|
||||
o 'Loop', -> $1
|
||||
]
|
||||
|
||||
Loop: [
|
||||
o "LOOP Block", -> new While(new Literal 'true').addBody $2
|
||||
o "LOOP Expression", -> new While(new Literal 'true').addBody Expressions.wrap [$2]
|
||||
o 'LOOP Block', -> new While(new Literal 'true').addBody $2
|
||||
o 'LOOP Expression', -> new While(new Literal 'true').addBody Expressions.wrap [$2]
|
||||
]
|
||||
|
||||
# Array, object, and range comprehensions, at the most generic level.
|
||||
@@ -469,41 +465,45 @@ grammar =
|
||||
]
|
||||
|
||||
Switch: [
|
||||
o "SWITCH Expression INDENT Whens OUTDENT", -> new Switch $2, $4
|
||||
o "SWITCH Expression INDENT Whens ELSE Block OUTDENT", -> new Switch $2, $4, $6
|
||||
o "SWITCH INDENT Whens OUTDENT", -> new Switch null, $3
|
||||
o "SWITCH INDENT Whens ELSE Block OUTDENT", -> new Switch null, $3, $5
|
||||
o 'SWITCH Expression INDENT Whens OUTDENT', -> new Switch $2, $4
|
||||
o 'SWITCH Expression INDENT Whens ELSE Block OUTDENT', -> new Switch $2, $4, $6
|
||||
o 'SWITCH INDENT Whens OUTDENT', -> new Switch null, $3
|
||||
o 'SWITCH INDENT Whens ELSE Block OUTDENT', -> new Switch null, $3, $5
|
||||
]
|
||||
|
||||
Whens: [
|
||||
o "When"
|
||||
o "Whens When", -> $1.concat $2
|
||||
o 'When'
|
||||
o 'Whens When', -> $1.concat $2
|
||||
]
|
||||
|
||||
# An individual **When** clause, with action.
|
||||
When: [
|
||||
o "LEADING_WHEN SimpleArgs Block", -> [[$2, $3]]
|
||||
o "LEADING_WHEN SimpleArgs Block TERMINATOR", -> [[$2, $3]]
|
||||
o 'LEADING_WHEN SimpleArgs Block', -> [[$2, $3]]
|
||||
o 'LEADING_WHEN SimpleArgs Block TERMINATOR', -> [[$2, $3]]
|
||||
]
|
||||
|
||||
# The most basic form of *if* is a condition and an action. The following
|
||||
# if-related rules are broken up along these lines in order to avoid
|
||||
# ambiguity.
|
||||
IfBlock: [
|
||||
o "IF Expression Block", -> new If $2, $3
|
||||
o "UNLESS Expression Block", -> new If $2, $3, invert: true
|
||||
o "IfBlock ELSE IF Expression Block", -> $1.addElse new If $4, $5
|
||||
o "IfBlock ELSE Block", -> $1.addElse $3
|
||||
o 'IF Expression Block', -> new If $2, $3
|
||||
o 'UNLESS Expression Block', -> new If $2, $3, invert: true
|
||||
o 'IfBlock ELSE IF Expression Block', -> $1.addElse new If $4, $5
|
||||
o 'IfBlock ELSE Block', -> $1.addElse $3
|
||||
]
|
||||
|
||||
# The full complement of *if* expressions, including postfix one-liner
|
||||
# *if* and *unless*.
|
||||
If: [
|
||||
o "IfBlock"
|
||||
o "Statement POST_IF Expression", -> new If $3, Expressions.wrap([$1]), statement: true
|
||||
o "Expression POST_IF Expression", -> new If $3, Expressions.wrap([$1]), statement: true
|
||||
o "Statement POST_UNLESS Expression", -> new If $3, Expressions.wrap([$1]), statement: true, invert: true
|
||||
o "Expression POST_UNLESS Expression", -> new If $3, Expressions.wrap([$1]), statement: true, invert: true
|
||||
o 'IfBlock'
|
||||
o 'Statement POST_IF Expression', ->
|
||||
new If $3, Expressions.wrap([$1]), statement: true
|
||||
o 'Expression POST_IF Expression', ->
|
||||
new If $3, Expressions.wrap([$1]), statement: true
|
||||
o 'Statement POST_UNLESS Expression', ->
|
||||
new If $3, Expressions.wrap([$1]), statement: true, invert: true
|
||||
o 'Expression POST_UNLESS Expression', ->
|
||||
new If $3, Expressions.wrap([$1]), statement: true, invert: true
|
||||
]
|
||||
|
||||
# Arithmetic and logical operators, working on one or more operands.
|
||||
@@ -522,6 +522,9 @@ grammar =
|
||||
o 'SimpleAssignable --', -> new Op '--', $1, null, true
|
||||
o 'SimpleAssignable ++', -> new Op '++', $1, null, true
|
||||
|
||||
# [The existential operator](http://jashkenas.github.com/coffee-script/#existence).
|
||||
o 'Expression ?', -> new Existence $1
|
||||
|
||||
o 'Expression + Expression', -> new Op '+' , $1, $3
|
||||
o 'Expression - Expression', -> new Op '-' , $1, $3
|
||||
|
||||
@@ -535,8 +538,10 @@ grammar =
|
||||
else
|
||||
new Op $2, $1, $3
|
||||
|
||||
o 'SimpleAssignable COMPOUND_ASSIGN Expression', -> new Assign $1, $3, $2
|
||||
o 'SimpleAssignable COMPOUND_ASSIGN INDENT Expression OUTDENT', -> new Assign $1, $4, $2
|
||||
o 'SimpleAssignable COMPOUND_ASSIGN
|
||||
Expression', -> new Assign $1, $3, $2
|
||||
o 'SimpleAssignable COMPOUND_ASSIGN
|
||||
INDENT Expression OUTDENT', -> new Assign $1, $4, $2
|
||||
]
|
||||
|
||||
|
||||
|
||||
Reference in New Issue
Block a user