'Exp env' diaporamas de présentation

מבוא מורחב למדעי המחשב בשפת Scheme

מבוא מורחב למדעי המחשב בשפת Scheme. תרגול 14. Metacircular Evaluator. 4.1, pages 362-398 definitions file on web. 2. Overview. 1. Eval, apply 2. Change definition 3. Add let, let* 4. Add special forms and, or 5. Abstraction of frame scanning 6. More examples. 3.

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Continue Evaluator

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מבוא מורחב למדעי המחשב בשפת Scheme

מבוא מורחב למדעי המחשב בשפת Scheme. תרגול 13. Metacircular Evaluator. 4.1, pages 362-398 definitions file on web. 2. Overview. 1. Eval, apply 2. Change definition 3. Add let, let* 4. Add special forms and, or 5. Abstraction of frame scanning. 3. Evaluator : a program that

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Jeremy R. Johnson

Programming Languages (CS 550) Operational Semantics of Scheme using Substitution and the Lambda Calculus. Jeremy R. Johnson. TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: A A A A A A. Starting Point Informal Scheme Semantics.

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CS220 Programming Principles

CS220 Programming Principles. ?????? ?? 2002 ???? Class 15: Meta-Circular Evaluator ? ??. Metacircular Evaluator. Implementing Lisp Interpreter : implemented language - Lisp Evaluator itself is a program Implementing language - Lisp

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Jeremy R. Johnson

Programming Languages (CS 550) Lecture 7 Summary Operational Semantics of Scheme using Substitution. Jeremy R. Johnson. TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: A A A A A A. Starting Point Informal Scheme Semantics.

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CS61A Lecture 25

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6.184 Lecture 5

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Scheme in Scheme 1

Scheme in Scheme 1. Why implement Scheme in Scheme. Implementing a language is a good way to learn more about programming languages Interpreters are easier to implement than compilers, in general Scheme is a simple language, but also a powerful one

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6.001 SICP Variations on a Scheme

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The metacircular evaluator (Cont.)

The metacircular evaluator (Cont.). 6. Defining new procedures (define (lambda? e) (tag-check e 'lambda)) (define (eval exp env) (cond ((number? exp) exp) ((symbol? exp) (lookup exp env)) ((define? exp) (eval-define exp env))

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CS61A Lecture 24

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6.001 SICP Further Variations on a Scheme

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Lecture 22

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Read - Eval - Print Loop

Read - Eval - Print Loop. ( define (driver-loop) (prompt-for-input input-prompt) (let ((input (read) )) (let ((output (eval input the-global-env) )) (announce-output output-prompt) (user-print output))) (driver-loop)). ( define (prompt-for-input string)

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CS220 Programming Principles

CS220 Programming Principles. ?????? ?? 2002 ???? Class 16: Variations on Evaluator ? ??. Syntactic Analysis. Syntax analysis is interleaved with execution. Source of Inefficiency - Syntax is analyzed many times Ex: (define (factorial n) (if (= n 1) 1

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Lecture 18

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The environment model evaluator and compiler

The env model evaluator Motivation. The environment model evaluator and compiler. Saves repeated renaming and substitution: Using new data structures (frame, environment), explicit substitution is replaced by variable bindings.

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Scheme in Scheme

Scheme in Scheme. Why implement Scheme in Scheme. Implementing a language is aa good way to learn more about programming languages Interpreters are easier to implement than compilers, in genera Scheme is a simple language, but also a powerful one

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Lecture 23

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