The Book

Class: Functions12

Six~ Functions12

Example 6/12: compile a little language into JavaScript functions.

new Functions12()

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Extends

Methods

add()

add: '+' product; returns fct for composition

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assign()

assign: Name '=' sum; returns fct

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cmp()

cmp: sum rel; returns fct

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divide()

divide: '/' signed; returns fct for composition

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eq()

eq: '=' expr; returns fct for composition

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ge()

ge: '>=' expr; returns fct for composition

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gt()

gt: '>' expr; returns fct for composition

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input()

input: 'input' [ Number ]; returns fct

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le()

le: '<=' expr; returns fct for composition

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list()

list: sum [{ ',' sum }]; returns executable

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loop()

loop: 'while' cmp 'do' stmts 'od'; returns fct

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lt()

lt: '<' expr; returns fct for composition

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multiply()

multiply: '*' signed; returns fct for composition

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name()

name: Name; returns fct

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ne()

ne: '<>' expr; returns fct for composition

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number()

number: Number; returns fct

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print()

print: 'print' sums; returns function

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product()

product: signed [{ multiply | divide }]; returns fct

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prog()

prog: stmts; returns executable

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select()

select: 'if' cmp 'then' stmts [ 'else' stmts ] 'fi'; returns fct

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signed()

signed: [ '-' ] term; returns fct

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stmts()

stmts: stmt [{ ';' stmt }]; returns fct

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subtract()

subtract: '-' product; returns fct for composition

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sum()

sum: product [{ add | subtract }]; returns fct

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sums()

sums: sum [{ ',' sum }]; returns list of functions

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term()

term: number | '(' sum ')';

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