diff options
Diffstat (limited to 'src/paca.mjs')
| -rw-r--r-- | src/paca.mjs | 49 |
1 files changed, 48 insertions, 1 deletions
diff --git a/src/paca.mjs b/src/paca.mjs index ae14538..42c2f88 100644 --- a/src/paca.mjs +++ b/src/paca.mjs @@ -15,7 +15,7 @@ const ConcatStep = { CLASS: "class", }; -const nonConcatOperators = new Set(["*", "+", "?", "|", ")"]); +const nonConcatOperators = new Set(["*", "+", "?", "|", ")", "$"]); const shouldConcat = (char, next) => next !== undefined && @@ -272,6 +272,44 @@ const TRANSITION_FNS = { }), }; +const ANCHOR_FNS = { + "^": ({ out, state, context }, _char, index, _next) => + index !== 0 + ? reduced({ + out, + state, + context, + error: new SyntaxError( + "^ not at the start of the expression", + ), + }) + : { + out: out.concat({ operator: "caret" }), + state, + context, + }, + "$": ({ out, state, context }, _char, _index, next) => + next !== undefined + ? reduced({ + out, + state, + context, + error: new SyntaxError( + "$ not at the end of the expression", + ), + }) + : { + out: out.concat({ operator: "dollar" }), + state, + context, + }, +}; + +const anchors = new Set(Object.keys(ANCHOR_FNS)); + +const isAnchor = char => + anchors.has(char); + const stateTransitionOperators = new Set(Object.keys(TRANSITION_FNS)); const isOperator = char => @@ -298,6 +336,15 @@ const tokenizeRegexStep = chars => ({ out, state, context }, char, index) => { ); } + if (isAnchor(char)) { + return ANCHOR_FNS[char]( + { out, state, context }, + char, + index, + next, + ); + } + const op = isOperator(char) ? { operator: char } : char; return { out: out.concat( |