| Commit message (Collapse) | Author | Age | Files | Lines |
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ORDER BY and GROUP BY options have to decide whether an expression is a
reference to the column specified in SELECT command by checking whether
it consists of only one integer literal.
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So Parse now returns a []ast.StmtNode instead of a generic []ast.Node,
which should be clearer on what the return value looks like. This also
adds a field recording the verb use to identify the statement in order
to provide better error messages.
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Now both position and length are both recorded in the error struct,
recording the token in the error struct no longer provides any benefit.
It is easy to find the token when position and length are known, but
requiring all error locations to fill the field is complicated because
they have to access the source code to find the token.
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Provide ESCAPE grammar for specifying escape character in like pattern
matching.
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When an error corresponds to a source code token, it should be able to
report the length of the token in addition to the position.
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Since we traverse an AST by calling functions recursively, we have to
protect the parser by limiting the depth of an AST.
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Code generated by pigeon includes many exported symbols which should not
be used by any other code other than the parser itself. To prevent them
from being misused, we used to hide them by editing the generated code
with sed. This commit removes the unreliable sed trick by putting
generated code to internal package.
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These symbols are allowed in Microsoft SQL or PostgreSQL, but the SQL
standard doesn't mention them. It is still possible to use these symbols
as identifiers by putting them in double quotes.
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Now all AST nodes should have position information recorded during
parsing. These fields are intended to be used to report errors and make
debugging easier. However, precise location of each token is currently
unavailable. It can be done in the future if it becomes necessary.
To make it easier to traverse an AST, GetChildren is modified to skip
nil nodes in the output. This means callers of GetChildren don't have
to check for nil in returned slices.
AST printer is modified to print the position and the corresponding
source code token. A few special handling for interfaces are removed
because reflection works better for structs.
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This commit implements isAddress function to allow a number literal to
be considered as an address literal. Since Solidity only allows '0x' to
be written in lower case, we remove the handling of upper case '0X' to
keep the behavior in sync with Solidity.
In addition to isAddress implementation, this commit also removes
'String' methods from AST nodes to prevent them from implementing the
builtin 'Stringer' interface. Therefore, our AST printer is now able to
print struct fields of value nodes instead of only one string.
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In order to make our AST easier and safer to use, all declarations with
empty interface type are now removed.
This changes also makes it possible to traverse the AST without using
reflection or understanding what each type means because all AST nodes
have at least one common interface.
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To cover the pitfall of decimal.fromString, we need to add leading 0 at
'^\.[0-9]+' case.
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Our parser is able to process queries with invalid UTF-8, provided that
it is compatible with ASCII. Since doing so requires encoding the input
before passing to pigeon, Parse* functions generated by pigeon are
unexported because they should not be used directly.
Escape sequences in string literals and identifiers are now recognized.
In addition to escape sequences supported by solidity, we support \U
similar to the one supported by Go to allow users to specify non-BMP
Unicode code point without using multiple \x escapes.
AST printer is modified to quote non-printable characters in strings to
prevent control characters from messing up the terminal.
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Instead of ignoring errors, errors returned from external functions are
normalized and reported to users. Errors which should be impossible to
occur are converted to panic calls.
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In order to avoid putting too many different things in single package
and allow other projects to reuse the syntax tree and the parser, these
two components are moved to different packages and all nodes used in AST
are now exported. A lot of comments are added in this commit to pass
golint checks.
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