4,302 questions
0
votes
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81
views
How to extract raw contents (including comments) within braces in specific situations?
I am trying to write an ANTLR4 grammar for the .asl file format (LiveSplit Autosplitting Language). It is a script format with one custom block (state) and several action blocks (startup, init, etc.) ...
- 101
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votes
0
answers
26
views
How to improve an antlr no viable alternative error message
I have an antlr grammer for cypher queries and ran into the following invalid case:
MATCH (u:person) where (u.firstName = 'foo' RETURN u.id
org.cytosm.common.Cypher2SqlException: Syntax error: line 1:...
- 11
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votes
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answers
29
views
ANTLR: Why does my grammar throw NoViableAltException?
I'm not seeing an explanation anywhere for what is triggering this exception. (I added EOF while looking, but it didn't help.) What's going on?
(I'm using C# and Antlr.Runtime.Standard from NuGet. Is ...
- 1,113
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votes
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answers
53
views
Reproducible Way to Create an AST from a Parse Tree
For my GameVM project I'm using ANTLR v4 to create multiple compiler
frontends. Generating the lexer and parser for each language saved me a ton
of work (especially since I have no background in ...
- 12.1k
1
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answers
120
views
How do I resolve these issues with my ANTLR grammar for AutoHotkey code?
I transpile AutoHotkey v2 code to C# using ANTLR4 and Roslyn. An example using only a few grammar elements, described by these rules:
Statements start at the start of a line, preceding white spaces ...
- 56
0
votes
1
answer
28
views
Values are not assigned in the visitLiteral, Left: null, Right: null, Operator: <
There is a code of STInterpreter class that then gets the code:
package com.jdcs.st;
import org.antlr.v4.runtime.*;
import org.antlr.v4.runtime.tree.*;
import java.util.HashMap;
import java.util.Map;
...
- 5,273
0
votes
1
answer
32
views
ANTLR line 1:12 token recognition error at: '\n'
I have a grammar like that:
grammar ST;
program: statement+;
statement: assignment ';'
| ifStatement
| whileStatement
| forStatement
| functionCall ';';
...
- 5,273
1
vote
1
answer
56
views
Issue with parse order in ANTLR4 grammar
Below is a very simplified grammar to illustrate the problem. I likely can handle the existing result in generated code, but suspect there is some more elegant way to instead control the parser. ...
0
votes
2
answers
40
views
How to Restrict return Statements to Function Declarations in ANTLR Grammar?
Question:
I'm working on a custom parser using ANTLR to define a small programming language. One of the requirements is that return statements can only appear inside the body of a function. If a ...
- 3
1
vote
1
answer
67
views
How to enforce using the same production for non-terminal symbol in a rule?
Say I have an ANTLR grammar:
program = word (' ' word)*
;
word = 'dog' | 'cat' | 'bird'
;
As I understand, it will match any sequence of words above, e.g. "dog dog cat", "dog cat ...
- 1,634
2
votes
0
answers
56
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antlr4 grammar - perf issues, ambiguities, and loads of single-char tokens
I am writing an antl4 grammar for splitting semicolon-separated statements. Below is a minimal version of the grammar. The full grammar has multiple types of comments, strings, identifiers, etc.
The ...
- 141
0
votes
1
answer
50
views
Antlr 4 Grammar seems to ignore defined precedence
I'm having an issue with my Antlr 4 grammar, where it seems like its ignoring precedence.
For the given expression $(USD)100'2 * -1, I expect it to evaluate $(USD)100'2 first then multiply by -1. So ...
- 55
1
vote
0
answers
91
views
ANTLR4: Why is it checking for Full Context?
I need some assistance identifying why this is checking for Full Context in my ANTLR4 Language:
Lexer: Here & Parser: Here
Shortened Parser with only the semi-relevant pieces:
startPlainString: ...
- 53
1
vote
1
answer
79
views
Multiple problems with ANTLR visitor processing
I am doing a pseudo programming language on ANTLR and Java. I met a few problems I can't deal with:
If, else if and else: only one statement is executed per each condition, so others will be skipped. ...
2
votes
1
answer
61
views
ANTLR4: no viable alternative at input 'stringname'
I am doing my research by making a programming language using antlr4 and I am struggling for whole day to fix the problem with two words being one token after whitespace removal.
This is my grammar ...