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1
PetitParser Compiler
Jan Kurš & Jan Vraný
Mohammad Ghafari, Mircea Lungu and
Oscar Nierstrasz
2
3
Parsing
Contexts
Bounded
Seas
Furthest
Failure
Layout-
senstivity
4
5
6
id ← #letter #word*
block ← #INDENT
expr /
block /
…
#DEDENT
expr ← term /
‘(‘ expr ‘)’ /
…
7
id ← #letter #word*
block ← #INDENT
expr /
block /
…
#DEDENT
expr ← term /
‘(‘ expr ‘)’ /
…
8
id ← #letter #word*
block ← #INDENT
expr /
block /
…
#DEDENT
expr ← term /
‘(‘ expr ‘)’ /
…
9
id ← #letter #word*
expr ← term /
‘(‘ expr ‘)’ /
…
10
id ← #letter #word*
expr ← term /
‘(‘ expr ‘)’ /
…
11
id ← #letter #word*
block ← #INDENT
expr /
block /
…
#DEDENT
expr ← term /
‘(‘ expr ‘)’ /
…
12
id ← #letter #word*
block ← #INDENT
expr /
block /
…
#DEDENT
expr ← term /
‘(‘ expr ‘)’ /
…
13
id ← #letter #word*
block ← #INDENT
expr /
block /
…
#DEDENT
expr ← term /
‘(‘ expr ‘)’ /
…
14
id ← #letter #word*
block ← #INDENT
expr /
block /
…
#DEDENT
expr ← term /
‘(‘ expr ‘)’ /
…
15
id ← #letter #word*
block ← #INDENT
expr /
block /
…
#DEDENT
expr ← term /
‘(‘ expr ‘)’ /
…
16
17
id ← #letter #word*
block ← #INDENT
expr /
block /
…
#DEDENT
expr ← term /
‘(‘ expr ‘)’ /
…
18
PetitParser
Compiler
19
10k methods of Pharo code
3 parsers
Compared to Compiled PetitParser
Speedup
20
PetitParser SmaCC RBParser
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
21
Expressions Python Smalltalk Java Ruby
0
2
4
6
8
10
12
14
22
PetitParser SmaCC RBParser
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Compiler
23
map:
Plus
program
Token
classToken
Token
idToken
Sequence
body
Action
class
Sequence
identifier
Sequence
ClassNode new
  id: idToken value
  body: body 
CharClass
#letter
Choice
letterOrDigit
CharClass
#digit
Star
… Indent
indent
Star Dedent
dedent
Choice
Action
method
…
24
0
0.2
0.4
0.6
0.8
1
1.2
Time[microseconds]
Time per Character of Smalltalk
Compiled Parser
GC time

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