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Class jie.Interpreter

java.lang.Object
    |
    +----jie.Interpreter

public class Interpreter

extends Object

• Variable declarations. Jie maintains a hashtable of local variables for use in local expressions. Jie supports the full java declaration syntax, with one exception: arrays must be declared as, "type[] variable", not "type variable[]". Jie supports (multidimensional) array initializers, but they are currently limited to initializing arrays of Integer, Float, and String. Jie does not support primitive types as local variables, so all primitives must be wrapped in their corresponding abstract type. When Jie is initialized, it preloads a reference to its own instance under the name "jie". This variable name can be used to reference the Jie fields and methods.
• Expressions. Jie currently supports the following operators:
  • Assignment ("=")
  • Construction ("new")
  • Addition/string concatenation ("+")
  • Subtraction, multiplication, division, mod ("-", "*", "/", "%")
  • Comparison ("!=", "==", "<", ">", "<=", ">=")
• Control flow. Jie currently supports the following control flow statements:
  • while (Boolean) statement
  • if (Boolean) statement [currently broken]
  • if (Boolean) statement else statement
• Method calls. Jie supports both static and instance method calls. Instance method calls may either dereference a local variable, or an expression which returns an object of the appropriate type (e.g. method call chaining). Jie will automatically unwrap parameters to the corresponding primitive type if appropriate.
• Field references. Jie supports both static and instance field references. Instance field references may either dereference a local variable, or an expression which returns an object of the appropriate type.
• Array references. Jie supports multidimensional arrays of any abstract type. Indices can be any expression that evaluates to an Integer object.
• Constants. Jie automatically converts string, integer, and float constants to appropriate wrapped objects.
• Compound statement blocks. Normally, Jie interprets statements one at a time. Statements enclosed within a pair of curly braces will be parsed into a single token tree, and executed together.
• Labeled statements The Jie parser has a facility to store a parsed statement for later recall. This is done with the following syntax: label#statement. Any future occurences of "label" will be substituted with the token tree generated by "statement". This can be used as a primitive macro facility or for aliasing frequently typed statements.
• Comments. Comments are useful for Jie script files (see: read())

• Class declaration.
• Try/catch.
• Nested variable scopes
• Method declaration.
• Package importing.

Version:

0.1.0

Author:

Michael Robinson (robinson@public.bta.net.cn)

See Also:

Shell

Interpreter(PrintStream, Context)

Create a new Interpreter instance

public Interpreter(PrintStream err,
                   Context context) throws Exception

Create a new Interpreter instance

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