Implement a new syntax to extract matched strings from expressions. For
example, instead of:
identifier = first:[a-zA-Z_] rest:[a-zA-Z0-9_]* { return first + rest.join(""); }
you can now just write:
identifier = $([a-zA-Z_] [a-zA-Z0-9_]*)
This is useful mostly for "lexical" rules at the bottom of many
grammars.
Note that structured match results are still built for the expressions
prefixed by "$", they are just ignored. I plan to optimize this later
(sometime after the code generator rewrite).
PEG.js source code becomes a set of Node.js modules that include each
other as needed. The distribution version is built by bundling these
modules together, wrapping them inside a bit of boilerplate code that
makes |module.exports| and |require| work.
Part of a fix for GH-32.
"modelled" is a British variant, "modeled" an US one. PEG.js officially
uses American English.
Based on pull request by John Gietzen:
https://github.com/dmajda/pegjs/pull/102
Changes all code that does something with "literal", "class" or "any"
AST nodes so that the code deals with these in the follwing order:
1. literal
2. class
3. any
Previously the code used this ordering:
1. literal
2. any
3. class
The new ordering is more logical because the nodes are handled from the
most specific to the most generic.
PEG.js grammar rules are represented by |rule| nodes in the AST. Until
now, all such nodes had a |displayName| property which was either |null|
or stored rule's human-readable name. This commit gets rid of the
|displayName| property and starts representing rules with a
human-readable name using a new |named| node (a child of the |rule|
node).
This change simplifies code generation code a bit as tests for
|displayName| can be removed (see changes in generate-code.js). It also
separates different concerns from each other nicely.
This simplifies the code a bit and makes the AST more regular (each node
type has a fixed set of properties). The latter may get useful later
when generalizing visitors.
Fixes the following JSHint errors:
./src/parser.js: line 2878, col 44, Missing radix parameter.
./src/parser.js: line 2949, col 44, Missing radix parameter.
Fixes the following JSHint errors:
./src/parser.js: line 460, col 50, Expected '!==' and instead saw '!='.
./src/parser.js: line 486, col 42, Expected '!==' and instead saw '!='.
Fixes the following JSHint errors:
./src/parser.js: line 193, col 18, Missing semicolon.
./src/parser.js: line 407, col 20, Missing semicolon.
./src/parser.js: line 2493, col 18, Missing semicolon.
./src/parser.js: line 2759, col 40, Missing semicolon.
The source code is now in the src directory. The library needs to be
built using "rake", which creates the lib/peg.js file by combining the
source files.
David Majda