mirror of
https://github.com/idanoo/GoScrobble.git
synced 2024-11-25 09:55:15 +00:00
456 lines
12 KiB
JavaScript
456 lines
12 KiB
JavaScript
|
var parse = require('../definition-syntax/parse');
|
||
|
|
|
||
|
|
var MATCH = { type: 'Match' };
|
||
|
|
var MISMATCH = { type: 'Mismatch' };
|
||
|
|
var DISALLOW_EMPTY = { type: 'DisallowEmpty' };
|
||
|
|
var LEFTPARENTHESIS = 40; // (
|
||
|
|
var RIGHTPARENTHESIS = 41; // )
|
||
|
|
|
||
|
|
function createCondition(match, thenBranch, elseBranch) {
|
||
|
|
// reduce node count
|
||
|
|
if (thenBranch === MATCH && elseBranch === MISMATCH) {
|
||
|
|
return match;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (match === MATCH && thenBranch === MATCH && elseBranch === MATCH) {
|
||
|
|
return match;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (match.type === 'If' && match.else === MISMATCH && thenBranch === MATCH) {
|
||
|
|
thenBranch = match.then;
|
||
|
|
match = match.match;
|
||
|
|
}
|
||
|
|
|
||
|
|
return {
|
||
|
|
type: 'If',
|
||
|
|
match: match,
|
||
|
|
then: thenBranch,
|
||
|
|
else: elseBranch
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
function isFunctionType(name) {
|
||
|
|
return (
|
||
|
|
name.length > 2 &&
|
||
|
|
name.charCodeAt(name.length - 2) === LEFTPARENTHESIS &&
|
||
|
|
name.charCodeAt(name.length - 1) === RIGHTPARENTHESIS
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
function isEnumCapatible(term) {
|
||
|
|
return (
|
||
|
|
term.type === 'Keyword' ||
|
||
|
|
term.type === 'AtKeyword' ||
|
||
|
|
term.type === 'Function' ||
|
||
|
|
term.type === 'Type' && isFunctionType(term.name)
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
function buildGroupMatchGraph(combinator, terms, atLeastOneTermMatched) {
|
||
|
|
switch (combinator) {
|
||
|
|
case ' ':
|
||
|
|
// Juxtaposing components means that all of them must occur, in the given order.
|
||
|
|
//
|
||
|
|
// a b c
|
||
|
|
// =
|
||
|
|
// match a
|
||
|
|
// then match b
|
||
|
|
// then match c
|
||
|
|
// then MATCH
|
||
|
|
// else MISMATCH
|
||
|
|
// else MISMATCH
|
||
|
|
// else MISMATCH
|
||
|
|
var result = MATCH;
|
||
|
|
|
||
|
|
for (var i = terms.length - 1; i >= 0; i--) {
|
||
|
|
var term = terms[i];
|
||
|
|
|
||
|
|
result = createCondition(
|
||
|
|
term,
|
||
|
|
result,
|
||
|
|
MISMATCH
|
||
|
|
);
|
||
|
|
};
|
||
|
|
|
||
|
|
return result;
|
||
|
|
|
||
|
|
case '|':
|
||
|
|
// A bar (|) separates two or more alternatives: exactly one of them must occur.
|
||
|
|
//
|
||
|
|
// a | b | c
|
||
|
|
// =
|
||
|
|
// match a
|
||
|
|
// then MATCH
|
||
|
|
// else match b
|
||
|
|
// then MATCH
|
||
|
|
// else match c
|
||
|
|
// then MATCH
|
||
|
|
// else MISMATCH
|
||
|
|
|
||
|
|
var result = MISMATCH;
|
||
|
|
var map = null;
|
||
|
|
|
||
|
|
for (var i = terms.length - 1; i >= 0; i--) {
|
||
|
|
var term = terms[i];
|
||
|
|
|
||
|
|
// reduce sequence of keywords into a Enum
|
||
|
|
if (isEnumCapatible(term)) {
|
||
|
|
if (map === null && i > 0 && isEnumCapatible(terms[i - 1])) {
|
||
|
|
map = Object.create(null);
|
||
|
|
result = createCondition(
|
||
|
|
{
|
||
|
|
type: 'Enum',
|
||
|
|
map: map
|
||
|
|
},
|
||
|
|
MATCH,
|
||
|
|
result
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (map !== null) {
|
||
|
|
var key = (isFunctionType(term.name) ? term.name.slice(0, -1) : term.name).toLowerCase();
|
||
|
|
if (key in map === false) {
|
||
|
|
map[key] = term;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
map = null;
|
||
|
|
|
||
|
|
// create a new conditonal node
|
||
|
|
result = createCondition(
|
||
|
|
term,
|
||
|
|
MATCH,
|
||
|
|
result
|
||
|
|
);
|
||
|
|
};
|
||
|
|
|
||
|
|
return result;
|
||
|
|
|
||
|
|
case '&&':
|
||
|
|
// A double ampersand (&&) separates two or more components,
|
||
|
|
// all of which must occur, in any order.
|
||
|
|
|
||
|
|
// Use MatchOnce for groups with a large number of terms,
|
||
|
|
// since &&-groups produces at least N!-node trees
|
||
|
|
if (terms.length > 5) {
|
||
|
|
return {
|
||
|
|
type: 'MatchOnce',
|
||
|
|
terms: terms,
|
||
|
|
all: true
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
// Use a combination tree for groups with small number of terms
|
||
|
|
//
|
||
|
|
// a && b && c
|
||
|
|
// =
|
||
|
|
// match a
|
||
|
|
// then [b && c]
|
||
|
|
// else match b
|
||
|
|
// then [a && c]
|
||
|
|
// else match c
|
||
|
|
// then [a && b]
|
||
|
|
// else MISMATCH
|
||
|
|
//
|
||
|
|
// a && b
|
||
|
|
// =
|
||
|
|
// match a
|
||
|
|
// then match b
|
||
|
|
// then MATCH
|
||
|
|
// else MISMATCH
|
||
|
|
// else match b
|
||
|
|
// then match a
|
||
|
|
// then MATCH
|
||
|
|
// else MISMATCH
|
||
|
|
// else MISMATCH
|
||
|
|
var result = MISMATCH;
|
||
|
|
|
||
|
|
for (var i = terms.length - 1; i >= 0; i--) {
|
||
|
|
var term = terms[i];
|
||
|
|
var thenClause;
|
||
|
|
|
||
|
|
if (terms.length > 1) {
|
||
|
|
thenClause = buildGroupMatchGraph(
|
||
|
|
combinator,
|
||
|
|
terms.filter(function(newGroupTerm) {
|
||
|
|
return newGroupTerm !== term;
|
||
|
|
}),
|
||
|
|
false
|
||
|
|
);
|
||
|
|
} else {
|
||
|
|
thenClause = MATCH;
|
||
|
|
}
|
||
|
|
|
||
|
|
result = createCondition(
|
||
|
|
term,
|
||
|
|
thenClause,
|
||
|
|
result
|
||
|
|
);
|
||
|
|
};
|
||
|
|
|
||
|
|
return result;
|
||
|
|
|
||
|
|
case '||':
|
||
|
|
// A double bar (||) separates two or more options:
|
||
|
|
// one or more of them must occur, in any order.
|
||
|
|
|
||
|
|
// Use MatchOnce for groups with a large number of terms,
|
||
|
|
// since ||-groups produces at least N!-node trees
|
||
|
|
if (terms.length > 5) {
|
||
|
|
return {
|
||
|
|
type: 'MatchOnce',
|
||
|
|
terms: terms,
|
||
|
|
all: false
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
// Use a combination tree for groups with small number of terms
|
||
|
|
//
|
||
|
|
// a || b || c
|
||
|
|
// =
|
||
|
|
// match a
|
||
|
|
// then [b || c]
|
||
|
|
// else match b
|
||
|
|
// then [a || c]
|
||
|
|
// else match c
|
||
|
|
// then [a || b]
|
||
|
|
// else MISMATCH
|
||
|
|
//
|
||
|
|
// a || b
|
||
|
|
// =
|
||
|
|
// match a
|
||
|
|
// then match b
|
||
|
|
// then MATCH
|
||
|
|
// else MATCH
|
||
|
|
// else match b
|
||
|
|
// then match a
|
||
|
|
// then MATCH
|
||
|
|
// else MATCH
|
||
|
|
// else MISMATCH
|
||
|
|
var result = atLeastOneTermMatched ? MATCH : MISMATCH;
|
||
|
|
|
||
|
|
for (var i = terms.length - 1; i >= 0; i--) {
|
||
|
|
var term = terms[i];
|
||
|
|
var thenClause;
|
||
|
|
|
||
|
|
if (terms.length > 1) {
|
||
|
|
thenClause = buildGroupMatchGraph(
|
||
|
|
combinator,
|
||
|
|
terms.filter(function(newGroupTerm) {
|
||
|
|
return newGroupTerm !== term;
|
||
|
|
}),
|
||
|
|
true
|
||
|
|
);
|
||
|
|
} else {
|
||
|
|
thenClause = MATCH;
|
||
|
|
}
|
||
|
|
|
||
|
|
result = createCondition(
|
||
|
|
term,
|
||
|
|
thenClause,
|
||
|
|
result
|
||
|
|
);
|
||
|
|
};
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
function buildMultiplierMatchGraph(node) {
|
||
|
|
var result = MATCH;
|
||
|
|
var matchTerm = buildMatchGraph(node.term);
|
||
|
|
|
||
|
|
if (node.max === 0) {
|
||
|
|
// disable repeating of empty match to prevent infinite loop
|
||
|
|
matchTerm = createCondition(
|
||
|
|
matchTerm,
|
||
|
|
DISALLOW_EMPTY,
|
||
|
|
MISMATCH
|
||
|
|
);
|
||
|
|
|
||
|
|
// an occurrence count is not limited, make a cycle;
|
||
|
|
// to collect more terms on each following matching mismatch
|
||
|
|
result = createCondition(
|
||
|
|
matchTerm,
|
||
|
|
null, // will be a loop
|
||
|
|
MISMATCH
|
||
|
|
);
|
||
|
|
|
||
|
|
result.then = createCondition(
|
||
|
|
MATCH,
|
||
|
|
MATCH,
|
||
|
|
result // make a loop
|
||
|
|
);
|
||
|
|
|
||
|
|
if (node.comma) {
|
||
|
|
result.then.else = createCondition(
|
||
|
|
{ type: 'Comma', syntax: node },
|
||
|
|
result,
|
||
|
|
MISMATCH
|
||
|
|
);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
// create a match node chain for [min .. max] interval with optional matches
|
||
|
|
for (var i = node.min || 1; i <= node.max; i++) {
|
||
|
|
if (node.comma && result !== MATCH) {
|
||
|
|
result = createCondition(
|
||
|
|
{ type: 'Comma', syntax: node },
|
||
|
|
result,
|
||
|
|
MISMATCH
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
result = createCondition(
|
||
|
|
matchTerm,
|
||
|
|
createCondition(
|
||
|
|
MATCH,
|
||
|
|
MATCH,
|
||
|
|
result
|
||
|
|
),
|
||
|
|
MISMATCH
|
||
|
|
);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (node.min === 0) {
|
||
|
|
// allow zero match
|
||
|
|
result = createCondition(
|
||
|
|
MATCH,
|
||
|
|
MATCH,
|
||
|
|
result
|
||
|
|
);
|
||
|
|
} else {
|
||
|
|
// create a match node chain to collect [0 ... min - 1] required matches
|
||
|
|
for (var i = 0; i < node.min - 1; i++) {
|
||
|
|
if (node.comma && result !== MATCH) {
|
||
|
|
result = createCondition(
|
||
|
|
{ type: 'Comma', syntax: node },
|
||
|
|
result,
|
||
|
|
MISMATCH
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
result = createCondition(
|
||
|
|
matchTerm,
|
||
|
|
result,
|
||
|
|
MISMATCH
|
||
|
|
);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
function buildMatchGraph(node) {
|
||
|
|
if (typeof node === 'function') {
|
||
|
|
return {
|
||
|
|
type: 'Generic',
|
||
|
|
fn: node
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (node.type) {
|
||
|
|
case 'Group':
|
||
|
|
var result = buildGroupMatchGraph(
|
||
|
|
node.combinator,
|
||
|
|
node.terms.map(buildMatchGraph),
|
||
|
|
false
|
||
|
|
);
|
||
|
|
|
||
|
|
if (node.disallowEmpty) {
|
||
|
|
result = createCondition(
|
||
|
|
result,
|
||
|
|
DISALLOW_EMPTY,
|
||
|
|
MISMATCH
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
|
||
|
|
case 'Multiplier':
|
||
|
|
return buildMultiplierMatchGraph(node);
|
||
|
|
|
||
|
|
case 'Type':
|
||
|
|
case 'Property':
|
||
|
|
return {
|
||
|
|
type: node.type,
|
||
|
|
name: node.name,
|
||
|
|
syntax: node
|
||
|
|
};
|
||
|
|
|
||
|
|
case 'Keyword':
|
||
|
|
return {
|
||
|
|
type: node.type,
|
||
|
|
name: node.name.toLowerCase(),
|
||
|
|
syntax: node
|
||
|
|
};
|
||
|
|
|
||
|
|
case 'AtKeyword':
|
||
|
|
return {
|
||
|
|
type: node.type,
|
||
|
|
name: '@' + node.name.toLowerCase(),
|
||
|
|
syntax: node
|
||
|
|
};
|
||
|
|
|
||
|
|
case 'Function':
|
||
|
|
return {
|
||
|
|
type: node.type,
|
||
|
|
name: node.name.toLowerCase() + '(',
|
||
|
|
syntax: node
|
||
|
|
};
|
||
|
|
|
||
|
|
case 'String':
|
||
|
|
// convert a one char length String to a Token
|
||
|
|
if (node.value.length === 3) {
|
||
|
|
return {
|
||
|
|
type: 'Token',
|
||
|
|
value: node.value.charAt(1),
|
||
|
|
syntax: node
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
// otherwise use it as is
|
||
|
|
return {
|
||
|
|
type: node.type,
|
||
|
|
value: node.value.substr(1, node.value.length - 2).replace(/\\'/g, '\''),
|
||
|
|
syntax: node
|
||
|
|
};
|
||
|
|
|
||
|
|
case 'Token':
|
||
|
|
return {
|
||
|
|
type: node.type,
|
||
|
|
value: node.value,
|
||
|
|
syntax: node
|
||
|
|
};
|
||
|
|
|
||
|
|
case 'Comma':
|
||
|
|
return {
|
||
|
|
type: node.type,
|
||
|
|
syntax: node
|
||
|
|
};
|
||
|
|
|
||
|
|
default:
|
||
|
|
throw new Error('Unknown node type:', node.type);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
MATCH: MATCH,
|
||
|
|
MISMATCH: MISMATCH,
|
||
|
|
DISALLOW_EMPTY: DISALLOW_EMPTY,
|
||
|
|
buildMatchGraph: function(syntaxTree, ref) {
|
||
|
|
if (typeof syntaxTree === 'string') {
|
||
|
|
syntaxTree = parse(syntaxTree);
|
||
|
|
}
|
||
|
|
|
||
|
|
return {
|
||
|
|
type: 'MatchGraph',
|
||
|
|
match: buildMatchGraph(syntaxTree),
|
||
|
|
syntax: ref || null,
|
||
|
|
source: syntaxTree
|
||
|
|
};
|
||
|
|
}
|
||
|
|
};
|