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Also updates all existing parsers to use an ES6 string literal inside the code so an example can be embedded easily.
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Brian Mock
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May 22, 2017
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Original file line number | Diff line number | Diff line change |
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@@ -1,6 +1,7 @@ | ||
{ | ||
"env": { | ||
"node": true | ||
"node": true, | ||
"es6": true | ||
}, | ||
"rules": { | ||
"no-console": "off" | ||
|
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,72 @@ | ||
var util = require('util'); | ||
var P = require('..'); | ||
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/////////////////////////////////////////////////////////////////////// | ||
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// If this were actually Python, "Block" wouldn't be a statement on its own, | ||
// but rather "If" and "While" would be statements that used "Block" inside. | ||
var Statement = | ||
P.lazy(function() { | ||
return P.alt(ExpressionStatement, Block); | ||
}); | ||
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// Just a simple `foo()` style function call. | ||
var FunctionCall = | ||
P.regexp(/[a-z]+/).skip(P.string('()')) | ||
.map(function(s) { return ['FunctionCall', s]; }) | ||
.desc('a function call'); | ||
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// To make it a statement we just need a newline afterward. | ||
var ExpressionStatement = | ||
FunctionCall.skip(P.string('\n')); | ||
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// The general idea of this is to assume there's "block:" on its own line, | ||
// then we capture the whitespace used to indent the first statement of the | ||
// block, and require that every other statement has the same exact string of | ||
// indentation in front of it. | ||
var Block = | ||
P.seq( | ||
P.string('block:\n'), | ||
P.regexp(/[ ]+/), | ||
Statement | ||
).chain(function(args) { | ||
// `.chain` is called after a parser succeeds. It returns the next parser | ||
// to use for parsing. This allows subsequent parsing to be dependent on | ||
// previous text. | ||
var indent = args[1]; | ||
var statement = args[2]; | ||
return P.string(indent).then(Statement).many() | ||
.map(function(statements) { | ||
return [statement].concat(statements); | ||
}); | ||
}) | ||
.map(function(statements) { | ||
return ['Block', statements]; | ||
}); | ||
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/////////////////////////////////////////////////////////////////////// | ||
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var text = `\ | ||
block: | ||
a() | ||
b() | ||
c() | ||
block: | ||
d() | ||
e() | ||
f() | ||
block: | ||
g() | ||
h() | ||
i() | ||
j() | ||
`; | ||
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function prettyPrint(x) { | ||
var opts = {depth: null, colors: 'auto'}; | ||
var s = util.inspect(x, opts); | ||
console.log(s); | ||
} | ||
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var ast = Block.tryParse(text); | ||
prettyPrint(ast); |