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Esprima (esprima.org, BSD license) is ahigh performance, standard-compliantECMAScriptparser officially written in ECMAScript (also popularly known asJavaScript) and ported toPython. Esprima is created and maintained byAriyaHidayat, with the help ofmanycontributors.

Python port is a line-by-line manual translation and was created and ismaintained byGerman Mendez Bravo(Kronuz).

• Full support for ECMAScript 2017 (ECMA-262 8thEdition)
• Sensiblesyntax treeformat asstandardized byESTree project
• Experimental support forJSX, asyntax extension forReact
• Optional tracking of syntax node location (index-based andline-column)
• Heavily tested (~1500unittestswithfull codecoverage)

pip install esprima

Esprima can be used to performlexicalanalysis(tokenization) orsyntacticanalysis (parsing) of aJavaScript program.

A simple example:

>>>importesprima>>>program='const answer = 42'>>>esprima.tokenize(program)[{type:"Keyword",value:"const"},{type:"Identifier",value:"answer"},{type:"Punctuator",value:"="},{type:"Numeric",value:"42"}]>>>esprima.parseScript(program){body:[{kind:"const",declarations:[{init:{raw:"42",type:"Literal",value:42},type:"VariableDeclarator",id:{type:"Identifier",name:"answer"}}],type:"VariableDeclaration"}],type:"Program",sourceType:"script"}

For more information, please read thecompletedocumentation.