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Fix indentation in docs

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John Doty 2025-02-16 08:06:10 -08:00
parent 5f19b1e73e
commit fbccaea2fa
2 changed files with 157 additions and 157 deletions
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94
README.md
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@ -17,31 +17,31 @@ class. Create one method per non-terminal, decorated with the `rule`
decorator. Here's an example: decorator. Here's an example:
```python ```python
from parser import * from parser import *
@rule @rule
def expression(): def expression():
return seq(expression, PLUS, term) | term return seq(expression, PLUS, term) | term
@rule @rule
def term(): def term():
return seq(LPAREN, expression, RPAREN) | ID return seq(LPAREN, expression, RPAREN) | ID
PLUS = Terminal('PLUS', '+') PLUS = Terminal('PLUS', '+')
LPAREN = Terminal('LPAREN', '(') LPAREN = Terminal('LPAREN', '(')
RPAREN = Terminal('RPAREN', ')') RPAREN = Terminal('RPAREN', ')')
ID = Terminal( ID = Terminal(
'ID', 'ID',
Re.seq( Re.seq(
Re.set(("a", "z"), ("A", "Z"), "_"), Re.set(("a", "z"), ("A", "Z"), "_"),
Re.set(("a", "z"), ("A", "Z"), ("0", "9"), "_").star(), Re.set(("a", "z"), ("A", "Z"), ("0", "9"), "_").star(),
), ),
) )
SimpleGrammar = Grammar( SimpleGrammar = Grammar(
name="Simple", name="Simple",
start=expression, start=expression,
) )
``` ```
Terminals can be plain strings or regular expressions constructed with Terminals can be plain strings or regular expressions constructed with
@ -59,17 +59,17 @@ There are no helpers (yet!) for consuming lists, so they need to be
constructed in the classic context-free grammar way: constructed in the classic context-free grammar way:
```python ```python
@rule @rule
def list(): def list():
return NUMBER | (list + COMMA + NUMBER) return NUMBER | (list + COMMA + NUMBER)
NUMBER = Terminal(Re.set(("0", "9")).plus()) NUMBER = Terminal(Re.set(("0", "9")).plus())
COMMA = Terminal(',') COMMA = Terminal(',')
NumberList = Grammar( NumberList = Grammar(
name="NumberList", name="NumberList",
start=list, start=list,
) )
``` ```
(Unlike with PEGs, you can write grammars with left or right-recursion, (Unlike with PEGs, you can write grammars with left or right-recursion,
@ -95,23 +95,23 @@ which means they don't generate nodes in the tree and just dump their
contents into the parent node instead. contents into the parent node instead.
```python ```python
@rule @rule
def list(): def list():
# The starting rule can't be transparent: there has to be something to # The starting rule can't be transparent: there has to be something to
# hold on to! # hold on to!
return transparent_list return transparent_list
@rule(transparent=True) @rule(transparent=True)
def transparent_list() -> Rule: def transparent_list() -> Rule:
return NUMBER | (transparent_list + COMMA + NUMBER) return NUMBER | (transparent_list + COMMA + NUMBER)
NUMBER = Terminal(Re.set(("0", "9")).plus()) NUMBER = Terminal(Re.set(("0", "9")).plus())
COMMA = Terminal(',') COMMA = Terminal(',')
NumberList = Grammar( NumberList = Grammar(
name="NumberList", name="NumberList",
start=list, start=list,
) )
``` ```
This grammar will generate the far more useful tree: This grammar will generate the far more useful tree:
@ -130,23 +130,23 @@ following the lead set by tree-sitter, and so the grammar above is
probably better-written as: probably better-written as:
```python ```python
@rule @rule
def list(): def list():
# The starting rule can't be transparent: there has to be something to # The starting rule can't be transparent: there has to be something to
# hold on to! # hold on to!
return transparent_list return transparent_list
@rule @rule
def _list() -> Rule: def _list() -> Rule:
return NUMBER | (_list + COMMA + NUMBER) return NUMBER | (_list + COMMA + NUMBER)
NUMBER = Terminal(Re.set(("0", "9")).plus()) NUMBER = Terminal(Re.set(("0", "9")).plus())
COMMA = Terminal(',') COMMA = Terminal(',')
NumberList = Grammar( NumberList = Grammar(
name="NumberList", name="NumberList",
start=list, start=list,
) )
``` ```
That will generate the same tree, but a little more succinctly. That will generate the same tree, but a little more succinctly.
@ -155,17 +155,17 @@ Of course, it's a lot of work to write these transparent recursive
rules by hand all the time, so there are helpers that do it for you: rules by hand all the time, so there are helpers that do it for you:
```python ```python
@rule @rule
def list(): def list():
return zero_or_more(NUMBER, COMMA) + NUMBER return zero_or_more(NUMBER, COMMA) + NUMBER
NUMBER = Terminal(Re.set(("0", "9")).plus()) NUMBER = Terminal(Re.set(("0", "9")).plus())
COMMA = Terminal(',') COMMA = Terminal(',')
NumberList = Grammar( NumberList = Grammar(
name="NumberList", name="NumberList",
start=list, start=list,
) )
``` ```
Much better. Much better.
@ -180,20 +180,20 @@ To allow (and ignore) spaces, newlines, tabs, and carriage-returns in
our number lists, we would modify the grammar as follows: our number lists, we would modify the grammar as follows:
```python ```python
@rule @rule
def list(): def list():
return zero_or_more(NUMBER, COMMA) + NUMBER return zero_or_more(NUMBER, COMMA) + NUMBER
NUMBER = Terminal(Re.set(("0", "9")).plus()) NUMBER = Terminal(Re.set(("0", "9")).plus())
COMMA = Terminal(',') COMMA = Terminal(',')
BLANKS = Terminal(Re.set(" ", "\t", "\r", "\n").plus()) BLANKS = Terminal(Re.set(" ", "\t", "\r", "\n").plus())
NumberList = Grammar( NumberList = Grammar(
name="NumberList", name="NumberList",
start=list, start=list,
trivia=[BLANKS], trivia=[BLANKS],
) )
``` ```
Now we can parse a list with spaces! "1 , 2, 3" will parse happily Now we can parse a list with spaces! "1 , 2, 3" will parse happily

96
dingus/about.md
View file

@ -20,31 +20,31 @@ object.
Here's an example: Here's an example:
```python {.numberLines} ```python {.numberLines}
from parser import * from parser import *
@rule @rule
def expression(): def expression():
return seq(expression, PLUS, term) | term return seq(expression, PLUS, term) | term
@rule @rule
def term(): def term():
return seq(LPAREN, expression, RPAREN) | ID return seq(LPAREN, expression, RPAREN) | ID
PLUS = Terminal('PLUS', '+') PLUS = Terminal('PLUS', '+')
LPAREN = Terminal('LPAREN', '(') LPAREN = Terminal('LPAREN', '(')
RPAREN = Terminal('RPAREN', ')') RPAREN = Terminal('RPAREN', ')')
ID = Terminal( ID = Terminal(
'ID', 'ID',
Re.seq( Re.seq(
Re.set(("a", "z"), ("A", "Z"), "_"), Re.set(("a", "z"), ("A", "Z"), "_"),
Re.set(("a", "z"), ("A", "Z"), ("0", "9"), "_").star(), Re.set(("a", "z"), ("A", "Z"), ("0", "9"), "_").star(),
), ),
) )
SimpleGrammar = Grammar( SimpleGrammar = Grammar(
name="Simple", name="Simple",
start=expression, start=expression,
) )
``` ```
Terminal patterns can be plain strings or regular expressions Terminal patterns can be plain strings or regular expressions
@ -61,17 +61,17 @@ things can be freely nested, as desired.
You can make lists in the classic context-free grammar way: You can make lists in the classic context-free grammar way:
```python {.numberLines} ```python {.numberLines}
@rule @rule
def list(): def list():
return NUMBER | (list + COMMA + NUMBER) return NUMBER | (list + COMMA + NUMBER)
NUMBER = Terminal(Re.set(("0", "9")).plus()) NUMBER = Terminal(Re.set(("0", "9")).plus())
COMMA = Terminal(',') COMMA = Terminal(',')
NumberList = Grammar( NumberList = Grammar(
name="NumberList", name="NumberList",
start=list, start=list,
) )
``` ```
(Unlike with PEGs, you can write grammars with left or right-recursion, (Unlike with PEGs, you can write grammars with left or right-recursion,
@ -97,23 +97,23 @@ which means they don't generate nodes in the tree and just dump their
contents into the parent node instead. contents into the parent node instead.
```python {.numberLines} ```python {.numberLines}
@rule @rule
def list(): def list():
# The starting rule can't be transparent: there has to be something to # The starting rule can't be transparent: there has to be something to
# hold on to! # hold on to!
return transparent_list return transparent_list
@rule(transparent=True) @rule(transparent=True)
def transparent_list() -> Rule: def transparent_list() -> Rule:
return NUMBER | (transparent_list + COMMA + NUMBER) return NUMBER | (transparent_list + COMMA + NUMBER)
NUMBER = Terminal(Re.set(("0", "9")).plus()) NUMBER = Terminal(Re.set(("0", "9")).plus())
COMMA = Terminal(',') COMMA = Terminal(',')
NumberList = Grammar( NumberList = Grammar(
name="NumberList", name="NumberList",
start=list, start=list,
) )
``` ```
This grammar will generate the far more useful tree: This grammar will generate the far more useful tree:
@ -132,23 +132,23 @@ following the lead set by tree-sitter, and so the grammar above is
probably better-written as: probably better-written as:
```python {.numberLines} ```python {.numberLines}
@rule @rule
def list(): def list():
# The starting rule can't be transparent: there has to be something to # The starting rule can't be transparent: there has to be something to
# hold on to! # hold on to!
return transparent_list return transparent_list
@rule @rule
def _list() -> Rule: def _list() -> Rule:
return NUMBER | (_list + COMMA + NUMBER) return NUMBER | (_list + COMMA + NUMBER)
NUMBER = Terminal(Re.set(("0", "9")).plus()) NUMBER = Terminal(Re.set(("0", "9")).plus())
COMMA = Terminal(',') COMMA = Terminal(',')
NumberList = Grammar( NumberList = Grammar(
name="NumberList", name="NumberList",
start=list, start=list,
) )
``` ```
That will generate the same tree, but a little more succinctly. That will generate the same tree, but a little more succinctly.
@ -157,17 +157,17 @@ Of course, it's a lot of work to write these transparent recursive
rules by hand all the time, so there are helpers that do it for you: rules by hand all the time, so there are helpers that do it for you:
```python {.numberLines} ```python {.numberLines}
@rule @rule
def list(): def list():
return zero_or_more(NUMBER, COMMA) + NUMBER return zero_or_more(NUMBER, COMMA) + NUMBER
NUMBER = Terminal(Re.set(("0", "9")).plus()) NUMBER = Terminal(Re.set(("0", "9")).plus())
COMMA = Terminal(',') COMMA = Terminal(',')
NumberList = Grammar( NumberList = Grammar(
name="NumberList", name="NumberList",
start=list, start=list,
) )
``` ```
Much better. Much better.
@ -182,21 +182,21 @@ To allow (and ignore) spaces, newlines, tabs, and carriage-returns in
our number lists, we would modify the grammar as follows: our number lists, we would modify the grammar as follows:
```python {.numberLines} ```python {.numberLines}
@rule @rule
def list(): def list():
return zero_or_more(NUMBER, COMMA) + NUMBER return zero_or_more(NUMBER, COMMA) + NUMBER
NUMBER = Terminal(Re.set(("0", "9")).plus()) NUMBER = Terminal(Re.set(("0", "9")).plus())
COMMA = Terminal(',') COMMA = Terminal(',')
BLANKS = Terminal(Re.set(" ", "\t", "\r", "\n").plus()) BLANKS = Terminal(Re.set(" ", "\t", "\r", "\n").plus())
# ^ and add a new terminal to describe what we're ignoring... # ^ and add a new terminal to describe what we're ignoring...
NumberList = Grammar( NumberList = Grammar(
name="NumberList", name="NumberList",
start=list, start=list,
trivia=[BLANKS], trivia=[BLANKS],
) )
``` ```
Now we can parse a list with spaces! "1 , 2, 3" will parse happily Now we can parse a list with spaces! "1 , 2, 3" will parse happily