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Build preliminary CQL parsing library targeting JS (#1434)
* Try out jsRun * Compile Kotlin to JS with type definitions. Export parseToTree method.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| import org.antlr.v4.kotlinruntime.CharStream | ||
| import org.antlr.v4.kotlinruntime.CharStreams | ||
| import org.antlr.v4.kotlinruntime.CommonTokenStream | ||
| import org.cqframework.cql.gen.cqlLexer | ||
| import org.cqframework.cql.gen.cqlParser | ||
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||
| @ExperimentalJsExport | ||
| @JsExport | ||
| fun parseToTree(logic: String): String { | ||
| val input: CharStream = CharStreams.fromString(logic) | ||
| val tokens = CommonTokenStream(cqlLexer(input)) | ||
| val parser = cqlParser(tokens) | ||
| parser.buildParseTree = true | ||
| val library = parser.library() | ||
|
|
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| // Inspect the library object in the console. | ||
| // Methods like toStringTree are mangled because they have multiple overloads. | ||
| // TODO: Remove in the future. | ||
| console.log("Library:", library) | ||
|
|
||
| return library.toStringTree(parser) | ||
| } | ||
|
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| // This method is not exported so it won't be available in the JS library. | ||
| // TODO: Remove in the future. | ||
| fun someMethod() { | ||
| console.log("I am not exported") | ||
| } | ||
|
|
||
| // This `main` method always just runs. | ||
| // TODO: Remove in the future. | ||
| fun main() { | ||
| val logic = "define inIPP : AgeAt(start of MeasurementPeriod) < 18" | ||
| val input: CharStream = CharStreams.fromString(logic) | ||
| val tokens = CommonTokenStream(cqlLexer(input)) | ||
| val parser = cqlParser(tokens) | ||
| parser.buildParseTree = true | ||
| val library = parser.library() | ||
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||
| val def = library.statement(0)?.expressionDefinition() | ||
| console.log(def?.identifier()?.IDENTIFIER().toString()) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| <!DOCTYPE html> | ||
| <html lang="en"> | ||
| <head> | ||
| <meta charset="UTF-8"> | ||
| <title>JS Client Demo</title> | ||
| </head> | ||
| <body> | ||
| <script src="cql.js"></script> | ||
| </body> | ||
| </html> |
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