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codin9cafe[2015.03.04]Open course(programming languages) - 장철호(Ch Jang)
1.
Programming Languages Building a
Web Brower Instructor : Westley Weimer 1
2.
2
3.
3 Interpreting Finds the meaning
of a program by traversing its parse tree + + 3 1 2 Parse Tree is means "6"
4.
4 Interpreting required to check
the types One goal of semantic analysis is to notice and rule out bad programs 1 +"hello" + 1 "hello" is means ?
5.
5 HTML Interpreting "<b>hello</b>" Syntactical Analysis Lexical Analysis [('tag-element', 'b',
[], [('word-element', 'hello')], 'b')]
6.
6 HTML Interpreting [('tag-element', 'b',
[], [('word-element', 'hello')], 'b')] tag-element b word-element hello b "<b>hello</b>"
7.
7 HTML Interpreting [('tag-element', 'b',
[], [('word-element', 'hello')], 'b')] tag-element b word-element hello b "<b>hello</b>"
8.
8 HTML Interpreting [('tag-element', 'b',
[], [('word-element', 'hello')], 'b')] tag-element b word-element hello b "<b>hello</b>"
9.
9 HTML Interpreting [('tag-element', 'b',
[], [('word-element', 'hello')], 'b')] tag-element b word-element hello b "<b>hello</b>"
10.
10 HTML Interpreting import graphics def
interpret(trees): for tree in trees: # ("word-element", "hello") nodetype=tree[0] if nodetype == "word-element": graphics.word(tree[1]) # [("tag-element", "b", [], [("word-element", "hello")], "b")] elif nodetype == "tag-element“: tagname = tree[1] tagargs = tree[2] subtrees = tree[3] closetagname = tree[4] "<a href=‘www.codin.com’>codin9cafe</a>" graphics.begintag(‘a’, {‘href’ : ’www.codin.com’}) graphics.word(‘codin9cafe’) graphics.endtag() codin9cafe
11.
11 HTML Interpreting if tagname
!= closetagname: graphics.warning("mismatched tag") else: graphics.begintag(tagname,tagargs) interpret(subtrees) graphics.endtag() graphics.initialize() # Enables display of output. interpret([("word-element","Hello")]) interpret([("tag-element","a",[],[("word-element","Hello")],"b")]) graphics.finalize() # Disables display of output.
12.
12 JS Interpreting " x
= 3 + 6" Syntactical Analysis Lexical Analysis (‘assign’, ’x’, (‘binop’, (‘number’, 3.0), ‘+’, (‘number’, 6.0)))
13.
13 JS Interpreting (‘assign’, ’x’,
(‘binop’, (‘number’, 3.0), ‘+’, (‘number’, 6.0))) assign x + "x = 3 + 6" number number 3.0 6.0 binop
14.
14 JS Interpreting (‘assign’, ’x’,
(‘binop’, (‘number’, 3.0), ‘+’, (‘number’, 6.0))) assign x + "x = 3 + 6" number number 3.0 6.0 binop
15.
15 JS Interpreting (‘assign’, ’x’,
(‘binop’, (‘number’, 3.0), ‘+’, (‘number’, 6.0))) assign x + "x = 3 + 6" number number 3.0 6.0 binop
16.
16 JS Interpreting (‘assign’, ’x’,
(‘binop’, (‘number’, 3.0), ‘+’, (‘binop’, (‘number’, 6.0))) assign x + "x = 3 + 6" number number 3.0 6.0 binop
17.
17 JS Interpreting def eval_stmts(tree,
environment): stmttype = tree[0] if stmttype == "assign": # ("assign", "x", ("binop", ..., "+", ...)) variable_name = tree[1] right_child = tree[2] new_value = eval_exp(right_child, environment) env_update(environment, variable_name, new_value) to know the current state ex) env = { “x” : 3 } x + 2 = 5
18.
18 JS Interpreting def eval_exp(tree,
environment): nodetype = tree[0] if nodetype == "number": return int(tree[1]) elif nodetype == "binop": left_value = eval_exp(tree[1], environment) operator = tree[2] right_value = eval_exp(tree[3], environment) if operator == "+": return left_value + right_value elif nodetype == "identifier": # ("binop", ("identifier","x"), "+", ("number","2")) identifier = tree[1] return env_lookup(environment,identifier)
19.
19 JS Interpreting x =
1 y = 2 def myfun(x): print x print y myfun(5) x : 1 y : 2 Global Environment x : 5 New Environment env = (None, {"x":1, “y":1}) newenv = (env, {"x":5})
20.
20
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